KR20180035649A - Method and apparatus for uplink control signal in wirelss cellular communication system - Google Patents

Abstract

The present disclosure relates to a communication technique for combining an IoT technique with a 5G communication system for supporting a higher data transmission rate after a 4G system, and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security- and safety-related services, etc.) based on a 5G communication technique and an IoT-related technique. The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a control signal related to uplink data transmission by a terminal in uplink transmission. The present invention provides a method for processing a control signal, which includes the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal to the base station.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting an uplink control signal in a wireless cellular communication system,

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a control signal related to uplink data transmission in an uplink transmission.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

In a wireless communication system, particularly a conventional LTE system, a UE uses MCS, transmission resources, TTI length, and the like as received from a base station upon uplink transmission. However, it may be necessary for the UE to transmit the uplink data without scheduling in the uplink grant from the base station.

In a method of uplink transmission without scheduling from a base station, the terminal may need to inform the base station of control information necessary for uplink data transmission. For example, if the uplink control signal includes an MCS including a modulation order, a TTI length, and an uplink transmission resource region to be used for data transmission and notifies the base station of the uplink control signal, the base station decodes the uplink control signal, It is possible to receive the uplink data signal. Accordingly, it is an object of the present invention to provide a method and an apparatus for transmitting an uplink control signal.

It is a further object of the present invention to provide a method and apparatus for providing various services at a shorter delay time through quick feedback reporting as a result of initial transmission.

It is a further object of the present invention to provide a method and apparatus for simultaneously providing different types of services. More specifically, when providing different types of services at the same time through the embodiments, it is possible to efficiently receive different types of services within the same time period by obtaining information received according to the characteristics of each service A method and an apparatus are provided.

It is still another object of the present invention to provide a method of estimating interference information through the same framework as RS setting and transmission and reception methods.

It is still another object of the present invention to provide a method and apparatus for transmitting downlink control information suitable for a 5G wireless communication system. More specifically, the method of transmitting downlink control information provided by the present invention can effectively transmit DCIs for various subcarrier intervals, thereby allowing the 5G communication system, in which different requirements can be simultaneously provided, to operate more flexibly So as to be able to be used.

According to an aspect of the present invention, there is provided a method of processing a control signal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting the second control signal generated based on the process to the base station.

According to an embodiment of the present invention, an operation method for transmitting control information for uplink transmission in a mobile station is provided so that efficient uplink transmission is performed between a base station and a mobile station.

Also, according to another embodiment of the present invention, an operation method of transmitting control information for uplink transmission in a mobile station is provided so that efficient uplink transmission is performed between the base station and the mobile station.

According to another embodiment of the present invention, a communication system can efficiently transmit data using different types of services. In addition, the embodiment can provide a method by which data transmission between homogeneous or heterogeneous services can coexist, thereby satisfying the requirements of each service, reducing delay of transmission time, Resources, and transmission power of the mobile station.

In addition, according to another embodiment of the present invention, a terminal can measure a channel through different TRPs or beams to enable coordination between a plurality of TRPs or beams. For example, when the UE receives at least one RS among the DL CSI-RS, the UL CSI-RS (SRS), and the DMRS through one or more resources and independently transmits / receives signals through each TRP or beam It is possible to generate channel status information for the case of cooperatively transmitting and receiving signals by using two or more TRPs or beams and report it to the base station. At this time, the interference measurement method of the present invention can measure the interference in various transmission / reception scenarios and reflect the interference to the channel state information generation. Also, the base station can set and announce the QCL information between each RS through the QCL signaling method provided by the present invention, and the terminal can receive and set the time / frequency of RSs transmitted locally in time and frequency resources. it is possible to compensate for the offset and improve the channel estimation performance.

Further, according to another embodiment of the present invention, a method for transmitting effective downlink control information in a 5G communication system supporting various numerologies is provided so that a 5G wireless communication system supporting various services simultaneously having different requirements can be efficiently .

1A is a diagram illustrating a downlink time-frequency domain transmission structure of an LTE or LTE-A system.
1B is a diagram illustrating an uplink time-frequency domain transmission structure of an LTE or LTE-A system.
1C is a diagram showing data allocated for eMBB, URLLC, and mMTC in frequency-time resources in the communication system.
FIG. 1D is a diagram showing data allocated for eMBB, URLLC, and mMTC in frequency-time resources in a communication system.
1E is a diagram illustrating a structure in which one transport block according to an embodiment is divided into several code blocks and CRC is added.
1F is a diagram illustrating a structure in which an outer code according to an embodiment is applied and coded.
FIG. 1G is a block diagram illustrating the presence or absence of the outer code according to the embodiment.
1 H is a diagram illustrating a procedure of a base station and a terminal according to the first embodiment.
FIG. 1I is a diagram illustrating a procedure of a base station and a terminal according to the first and second embodiments.
1J is a diagram illustrating an example of an uplink control signal, a reference signal, and a data signal structure according to the first to third embodiments.
1K is a diagram illustrating an example of an uplink control signal, a reference signal, and a data signal structure according to the first to third embodiments.
FIG. 11 is a diagram illustrating an example of an uplink control signal, a reference signal, and a data signal structure according to the first to third embodiments.
1M is a diagram illustrating an internal structure of a terminal according to embodiments of the present invention.
FIG. 1N is a diagram illustrating an internal structure of a base station according to embodiments of the present invention. FIG.
2A is a diagram illustrating a downlink time-frequency domain transmission structure of an LTE or LTE-A system.
2B is a diagram illustrating an uplink time-frequency domain transmission structure of an LTE or LTE-A system.
FIG. 2C is a diagram showing data allocated for eMBB, URLLC, and mMTC in frequency-time resources in the communication system.
FIG. 2D is a diagram showing data allocated for eMBB, URLLC, and mMTC in frequency-time resources in a communication system.
2E is a diagram illustrating a self-contained structure in which the uplink and the downlink exist in one subframe in the communication system.
FIG. 2F is a view showing a feedback on the result of the initial transmission on the self-sustaining structure of Time Division Duplexing (TDD).
FIG. 2G shows a quick feedback of the results of the initial transmission on the self-sustaining structure of time division multiplexing.
Figure 2h is a diagram illustrating the use of the same resource for fast feedback on the results of the initial transmission and for the results of the initial transmission on the self-sustaining structure of time division multiplexing.
FIG. 2I is a diagram showing feedback of the result of initial transmission in Frequency Division Duplexing (FDD).
FIG. 2J is a diagram showing fast feedback of the results of a part of the initial transmission in frequency division multiplexing.
FIG. 2K is a diagram showing different feedbacks on the results of each initial transmission in frequency division multiplexing.
FIG. 21 is a view showing the use of the same resource in the frequency division multiplexing as the feedback of the result of the initial transmission and the quick feedback of the result of the initial transmission.
2M is a view showing a time-frequency resource for reporting fast feedback and feedback together.
2n is a diagram illustrating a terminal operation according to the embodiment 2-1.
2O is a diagram illustrating a terminal operation according to the embodiment 2-2.
2P is a diagram illustrating a terminal operation according to the embodiment 2-3.
FIG. 2Q is a diagram illustrating a terminal operation according to the second to fourth embodiments.
2R is a diagram illustrating a terminal operation according to the second to fifth embodiments.
FIG. 2S is a diagram illustrating a base station operation according to the second to sixth embodiments. FIG.
2T is a diagram illustrating base station operation according to the second to seventh embodiments.
2U is a block diagram showing the structure of a UE according to embodiments.
2V is a block diagram showing the structure of a base station according to the embodiments.
FIG. 3A is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in the downlink in an LTE system or a similar system.
3B is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which an uplink data or control channel is transmitted in an LTE-A system.
FIG. 3C is a diagram showing data allocated for eMBB, URLLC, and mMTC, which are services to be considered in a 5G or NR system, from frequency-time resources.
FIG. 3D is a diagram showing data allocated to eMBB, URLLC, and mMTC, which are considered services in a 5G or NR system, in orthogonal allocation in frequency-time resources.
3E is a diagram illustrating a time and frequency resource region in which a UE can perform grant-free uplink transmission.
FIG. 3F illustrates operation of a base station according to an embodiment of the present invention.
3G is a diagram illustrating a terminal operation according to an embodiment of the present invention.
3H is a block diagram showing the structure of a terminal according to an embodiment.
3I is a block diagram illustrating the structure of a UE according to an embodiment.
4A is a diagram illustrating a downlink time-frequency domain transmission structure of an LTE or LTE-A system according to the prior art.
4B is a diagram illustrating an uplink time-frequency domain transmission structure of an LTE or LTE-A system according to the prior art.
4C is a diagram showing a PRB structure of the LTE-A system.
4D is a diagram illustrating CSI-RS power boosting of the LTE-A system.
4E is a diagram illustrating a PRB structure of the NR system according to the 4-1 embodiment of the present invention.
4F is a diagram showing an example of IM resource setting according to the fourth embodiment of the present invention.
4G is a diagram showing an example of a network coordination.
4H is a diagram illustrating an example of a single point transmission based QCL setting.
FIG. 4I is a diagram illustrating an example of multi point transmission-based QCL setting.
4J is a diagram showing a flowchart of the fourth to third embodiments of the present invention.
FIG. 4K is a diagram illustrating examples of OFDM symbols for NR CSI-RS transmission of the present invention to avoid OFDM symbols for NRDMRS and NR PDCCH transmission and OFDM symbols for LTE CRS transmission.
FIG. 41 is a diagram illustrating further examples of OFDM symbols for NR CSI-RS transmission of the present invention to avoid OFDM symbols for transmission of NR DMRS and NR PDCCH and OFDM symbols for LTE CRS transmission.
FIG. 4M is a diagram illustrating examples of coexistence between various signals such as NR CSI-RS / NR DMRS / LTE CRS through subgrouping of NR CSI-RS resources of the present invention.
4na, 4nb, 4nc and 4nd illustrate examples of CSI-RS port mapping for CSI-RS resources according to an embodiment of the present invention.
4OA, 4OB, 4OC, 4OD and 4OE illustrate examples of CSI-RS port mapping for CSI-RS resources according to an embodiment of the present invention.
5A is a diagram illustrating an example in which 5G services are multiplexed and transmitted in one system.
5B is a diagram showing a basic structure of the time-frequency domain in LTE.
FIG. 5C is a view showing resource elements having different subcarrier intervals. FIG.
5D shows a resource allocation type in LTE.
5E is a diagram showing the number of RBs according to subcarrier intervals.
FIG. 5F is a diagram illustrating a resource allocation method 1 according to the fifth embodiment of the present invention.
FIG. 5G is a diagram illustrating a resource allocation method 2 according to the fifth embodiment of the present invention.
5H is a diagram illustrating a resource allocation method 3 according to the fifth embodiment of the present invention.
5I is a diagram illustrating a 5G communication system according to a fifth embodiment of the present invention.
5J is a diagram illustrating a base station and a terminal procedure according to Embodiment 5-2-1 of the present invention.
5K is a diagram illustrating a base station and a terminal procedure according to Embodiment 5-2-2 of the present invention.
FIG. 51 is a diagram illustrating a base station and a terminal procedure according to Embodiment 5-2-3 of the present invention.
5M is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
5n is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

≪ Embodiment 1 >

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. Further, in order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network (D2D), a wireless backhaul, a moving network, a cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation ) Are being developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas, which are 5G communication technologies will be. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

On the other hand, NR (New Radio Access Technology), a new 5G communication, is designed to freely multiplex various services in time and frequency resources. Accordingly, waveform / numerology and reference signals are dynamic Or can be freely assigned. In order to provide optimal service to the terminal in wireless communication, it is important to optimize the data transmission by measuring the quality of the channel and the interference amount, and accordingly, accurate channel state measurement is essential. However, unlike 4G communication, in which channel and interference characteristics do not vary greatly according to frequency resources, the channel and interference characteristics vary greatly depending on the service in the 5G channel. Therefore, a FRG (Frequency Resource Group) It is necessary to support the subset of. Meanwhile, the types of services supported by the NR system can be divided into categories such as Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC), and URLLC (Ultra-Reliable and Low Latency Communications). eMBB is a high-speed transmission of high-capacity data, mMTC is a service aiming at minimizing terminal power and connecting multiple terminals, and high reliability and low latency of URLLC. Different requirements can be applied depending on the type of service applied to the terminal.

As described above, a plurality of services can be provided to a user in the communication system, and a method and a device using the method that can provide each service within the same time interval in accordance with the characteristics to provide the plurality of services to the user are required .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

It will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in the present embodiment means a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card. Also, in an embodiment, 'to' may include one or more processors.

For example, 3GPP's High Speed Packet Access (HSPA), LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced To a broadband wireless communication system that provides high-speed, high-quality packet data services such as the LTE-A, 3GPP2 high rate packet data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e communication standards. . In addition, a 5G or NR (new radio) communication standard is being produced with the fifth generation wireless communication system.

In the LTE system, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is used in a downlink (DL) and a Single Carrier Frequency Division Multiple (SC-FDMA) scheme is used in an uplink Access) method. The uplink refers to a radio link through which a UE (User Equipment) or an MS (Mobile Station) transmits data or control signals to a base station (eNode B or base station (BS) The term " wireless link " In the above multiple access scheme, the data or control information of each user is classified and operated so that the time and frequency resources for transmitting data or control information for each user do not overlap each other, that is, orthogonality is established. do.

The LTE system adopts a Hybrid Automatic Repeat reQuest (HARQ) scheme in which a physical layer resends data when a decoding failure occurs in an initial transmission. In the HARQ scheme, if a receiver fails to correctly decode (decode) data, the receiver transmits information indicating a decoding failure (NACK: Negative Acknowledgment) to the transmitter so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with the previously decoded data to improve data reception performance. In addition, when the receiver correctly decodes the data, an acknowledgment (ACK) indicating the decoding success is transmitted to the transmitter so that the transmitter can transmit new data.

FIG. 1A is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which data or a control channel is transmitted in a downlink in an LTE system.

In Fig. 1A, the abscissa represents the time domain and the ordinate axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol. N _symb (1a-02) OFDM symbols constitute one slot 1a-06, and two slots are gathered to form one subframe 1a-05. . The length of the slot is 0.5 ms and the length of the subframe is 1.0 ms. The radio frames 1a to 14 are time-domain units composed of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the total system transmission bandwidth is composed of a total of N _BW (1 - 04) subcarriers.

In a time-frequency domain, a basic unit of a resource can be represented by an OFDM symbol index and a subcarrier index as a resource element 1a-12. A resource block (RB or physical resource block) PRB includes N _symb (1a-02) consecutive OFDM symbols in the time domain and N _RB (1a-10) consecutive subcarriers in the frequency domain . Therefore, one RB 1a-08 is composed of N _symb x N _RB REs 1a-12. In general, the minimum transmission unit of data is the RB unit. In the LTE system, N _symb = 7 and N _RB = 12, and N _BW and N _RB are proportional to the bandwidth of the system transmission band, but other values may be used in systems other than the LTE system. The data rate increases in proportion to the number of RBs scheduled to the UE. The LTE system defines and operates six transmission bandwidths. In the case of an FDD system in which the downlink and the uplink are classified by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 1a-01 shows the correspondence relationship between the system transmission bandwidth and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth has a transmission bandwidth of 50 RBs.

[Table 1a]

The downlink control information may be transmitted within the first N OFDM symbols in the subframe. In the embodiment, N = {1, 2, 3} in general. Therefore, the N value can be variably applied to each subframe according to the amount of control information to be transmitted in the current subframe. The transmitted control information may include a control channel transmission interval indicator indicating how many OFDM symbols are transmitted through the control information, scheduling information for downlink data or uplink data, and HARQ ACK / NACK information.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from a base station to a mobile station through downlink control information (DCI). The DCI is defined according to various formats, and it is determined according to each format whether the scheduling information (UL grant) for the uplink data or the scheduling information (DL grant) for the downlink data, whether the size of the control information is compact DCI , Whether to apply spatial multiplexing using multiple antennas, whether or not DCI is used for power control, and the like. For example, DCI format 1, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

- Resource allocation type 0/1 flag: Indicates whether the resource allocation scheme is Type 0 or Type 1. Type 0 allocates resources by resource block group (RBG) by applying bitmap method. In the LTE system, the basic unit of scheduling is an RB represented by time and frequency domain resources, and the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in the type 0 scheme. Type 1 allows a specific RB to be allocated within the RBG.

- Resource block assignment: Indicates the RB allocated to the data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Indicates the modulation scheme used for data transmission and the size of the transport block, which is the data to be transmitted.

- HARQ process number: Indicates the HARQ process number.

- New data indicator: Indicates whether HARQ is initial transmission or retransmission.

- Redundancy version: Indicates the redundancy version of HARQ.

- Transmit Power Control (TPC) command for PUCCH for Physical Uplink Control CHannel: Indicates a transmission power control command for the uplink control channel PUCCH.

The DCI is a physical downlink control channel (PDCCH) (or control information), or an Enhanced PDCCH (Enhanced PDCCH) (or enhanced control information, hereinafter referred to as " It may be used on a mixed basis).

Generally, the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or a mobile station identifier) independently of each mobile station, and a cyclic redundancy check (CRC) is added, channel-coded and then composed of independent PDCCHs . In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal, and can be transmitted over the entire system transmission band.

The downlink data may be transmitted on a physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission. PDSCH may be transmitted after the control channel transmission interval, and scheduling information such as a specific mapping position and a modulation scheme in the frequency domain is determined based on the DCI transmitted through the PDCCH.

Through the MCS among the control information constituting the DCI, the BS notifies the MS of the modulation scheme applied to the PDSCH to be transmitted and the transport block size (TBS) to be transmitted. In an embodiment, the MCS may be composed of 5 bits or more or fewer bits. The TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) to be transmitted by the base station.

The modulation schemes supported by the LTE system are QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and 64QAM, and the respective modulation order (Qm) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation. Also, according to the system modification, a modulation method of 256QAM or more can be used.

1B is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which data or a control channel is transmitted in an uplink in an LTE-A system.

Referring to FIG. 1B, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an SC-FDMA symbol 1b-02, and N _symb ^UL SC-FDMA symbols can be gathered to form one slot 1b-06. Then, two slots form one subframe (1b-05). The minimum transmission unit in the frequency domain is a subcarrier, and the total system transmission bandwidth (1b-04) is composed of a total of N _BW subcarriers. The NBW may have a value proportional to the system transmission band.

The basic unit of resources in the time-frequency domain is a resource element (RE, 1b-12), which can be defined as an SC-FDMA symbol index and a subcarrier index. A resource block pair (RB pair) 1b-08 may be defined as N _symb ^UL consecutive SC-FDMA symbols in the time domain and N _SC ^RB consecutive subcarriers in the frequency domain. Therefore, one RB consists of N _symb ^UL x N _SC ^RB REs. In general, the minimum transmission unit of data or control information is RB unit. In case of PUCCH, it is mapped to a frequency region corresponding to 1 RB and transmitted for 1 sub-frame.

In the LTE system, an uplink physical channel PUCCH or PUSCH, to which HARQ ACK / NACK corresponding to a PDCCH / EPDDCH including a physical channel for downlink data transmission or a semi-persistent scheduling release (SPS release) Is defined. For example, in an LTE system operating in a frequency division duplex (FDD), a HARQ ACK / NACK corresponding to a PDCCH / EPDCCH including PDSCH or SPS release transmitted in an n-4th subframe is transmitted as a PUCCH or a PUSCH .

In the LTE system, the downlink HARQ employs an asynchronous HARQ scheme in which the data retransmission time is not fixed. That is, when HARQ NACK is fed back from the UE to the initial transmission data transmitted from the BS, the BS freely determines the transmission time point of the retransmission data by the scheduling operation. The UE buffers data determined to be an error as a result of decoding the received data for HARQ operation, and then performs the combining with the next retransmission data.

When the UE receives the PDSCH including the downlink data transmitted from the base station in the subframe n, the UE transmits the uplink control information including the HARQ ACK or NACK of the downlink data to the subframe n + k through the PUCCH or PUSCH, Lt; / RTI > In this case, k is defined differently according to the FDD or TDD (time division duplex) of the LTE system and its subframe setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number.

1C and 1D show data allocated to eMBB, URLLC, and mMTC, which are services to be considered in a 5G or NR system, in frequency-time resources.

Referring to FIGS. 1C and 1D, a method in which frequency and time resources are allocated for information transmission in each system can be seen.

In FIG. 1C, data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band (1c-00). When the URLLC data 1c-03, 1c-05, 1c-07 is generated while the eMBB 1c-01 and the mMTC 1c-09 are allocated and transmitted in a specific frequency band and transmission is required, 01) and mMTC (1c-09) can be emptied or the URLLC data 1c-03, 1c-05, 1c-07 can be transmitted without transmitting. Among the above services, since the URLLC needs to reduce the delay time, the URLLC data can be allocated (1c-03, 1c-05, 1c-07) to a part of the resource 1c-01 allocated to the eMBB. Of course, when URLLC is further allocated and transmitted in the resource to which the eMBB is allocated, the eMBB data may not be transmitted in the overlapping frequency-time resources, and thus the transmission performance of the eMBB data may be lowered. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.

In FIG. 1D, the entire system frequency band 1d-00 can be divided and used for transmitting services and data in the respective subbands 1d-02, 1d-04, 1d-06. The information related to the subband setting can be predetermined, and the information can be transmitted to the base station through the upper signaling. Alternatively, information related to the subbands may be provided by the base station or the network node without any separate subband configuration information being transmitted to the terminal. In Fig. 1D-, subband 1d-02 is used for eMBB data transmission, subband 404 is used for URLLC data transmission, and subband 1d-06 is used for mMTC data transmission.

The length of the transmission time interval (TTI) used in the URLLC transmission in the first embodiment may be shorter than the TTI length used in the eMBB or mMTC transmission. Also, it is possible to transmit the response of the information related to the URLLC faster than the eMBB or mMTC, so that information can be transmitted and received with a low delay.

1E is a diagram illustrating a process in which one transport block is divided into a plurality of code blocks and a CRC is added.

Referring to FIG. 1E, a CRC (1e-03) may be added to the last or first part of one transport block (1e-01) to be transmitted in the uplink or the downlink. The CRC may have 16 bits or 24 bits or a predetermined number of bits or a variable number of bits depending on a channel condition or the like and may be used to determine whether channel coding is successful or not. The blocks 1e-01 and 1e-03 to which the TB and the CRC are added can be divided into a plurality of code blocks (CBs) 1e-07, 1e-09, 1e-11 and 1e-13 -05). In this case, the last code block 1e-13 may be smaller than the other code blocks, or may be set to 0, a random value or 1 to set the length of the code block to be different from the length of the other code blocks Can be adjusted to be the same. CRCs 1e-17, 1e-19, 1e-21, and 1e-23 may be added to the divided code blocks (1e-15). The CRC may have 16 bits or 24 bits, or a predetermined number of bits, and may be used to determine whether channel coding is successful. However, the CRCs (1e-03) added to the TB and the CRCs (1e-17, 1e-19, 1e-21, 1e-23) added to the code block are omitted depending on the type of channel code to be applied to the code block It is possible. For example, when an LDPC code is applied to a code block instead of a turbo code, the CRCs 1e-17, 1e-19, 1e-21, and 1e-23 to be inserted for each code block may be omitted. However, even when the LDPC is applied, the CRCs 1e-17, 1e-19, 1e-21, and 1e-23 can be directly added to the code block. Also, CRC can be added or omitted even when polar codes are used.

FIG. 1F is a diagram showing a manner in which an outer code is used and transmitted, and FIG. 1G is a block diagram showing a structure of a communication system in which the outer code is used.

Referring to FIGS. 1F and 1G, a method of transmitting a signal using an outer code can be examined.

1F shows a case where one transport block is divided into a plurality of code blocks and bits or symbols 1f-04 at the same position in each code block are encoded with a second channel code to form parity bits or symbols 1f- 06) can be generated (1f-02). Thereafter, CRCs may be added to the respective code blocks and the parity code blocks generated by the second channel code encoding, respectively (1f-08, 1f-10). The addition of the CRC may vary depending on the type of the channel code. For example, when the turbo code is used as the first channel code, the CRCs (1f-08, 1f-10) are added, but then each code block and parity code blocks can be encoded in the first channel code encoding have.

If an outer code is used, the data to be transmitted passes through the second channel coding encoder 1g-09. The channel code used for the second channel coding may be, for example, a Reed-Solomon code, a BCH code, a Raptor code, a parity bit generation code, or the like. The bits or symbols thus passed through the second channel coding encoder 1g-09 pass through the first channel coding encoder 1g-11. The channel code used for the first channel coding includes a convolutional code, an LDPC code, a turbo code, and a polar code. When the channel-coded symbols are received by the receiver through the channel 1g-13, the first channel coding decoder 1g-15 and the second channel coding decoder 1g-17 are controlled based on the received signal And can be operated sequentially. The first channel coding decoder 1g-15 and the second channel coding decoder 1g-17 perform operations corresponding to the first channel coding encoder 1g-11 and the second channel coding encoder 1g-09, respectively can do.

On the other hand, in the channel coding block diagram in which the outer code is not used, only the first channel coding encoder 1g-11 and the first channel coding decoder 1g-05 are used in the transceiver respectively, and the second channel coding encoder and the second channel coding Decoders are not used. Even when the outer code is not used, the first channel coding encoder 1g-11 and the first channel coding decoder 1g-05 may be configured in the same way as the outer code is used.

The eMBB service described below will be referred to as a first type service and the eMBB data will be referred to as first type data. The first type service or the first type data is not limited to the eMBB, but may be applied to a case where high-speed data transmission is required or a broadband transmission is performed. The URLLC service is referred to as a second type service, and the data for URLLC is referred to as second type data. The second type service or second type data is not limited to URLLC, but may be applicable to other systems requiring a low delay time, requiring high reliability transmission, or requiring low latency and high reliability at the same time. The mMTC service is called a third type service, and the mMTC data is called a third type data. The third type service or the third type data is not limited to mMTC but may be applicable to a case where a low speed, wide coverage, or low power is required. Further, in describing the embodiment, it can be understood that the first type service includes or does not include the third type service.

The structure of the physical layer channel used for each type may be different in order to transmit the three services or data. For example, at least one of a transmission time interval (TTI) length, a frequency resource allocation unit, a control channel structure, and a data mapping method may be different.

Although three services and three pieces of data have been described above, there are more kinds of services and corresponding data. In this case, the contents of the present invention can be applied.

The terms physical channel and signal in a conventional LTE or LTE-A system may be used to describe the method and apparatus proposed in the embodiment. However, the contents of the present invention can be applied to wireless communication systems other than LTE and LTE-A systems.

As described above, the embodiment defines transmission and reception operations of a first type, a second type, a third type service, and a terminal and a base station for data transmission, and transmits terminals having different types of services or data scheduling to the same system We suggest a concrete method to operate together. In the present invention, the first type, the second type and the third type terminals are respectively referred to as terminals of type 1, type 2, type 3, or data scheduling. In an embodiment, the first type terminal, the second type terminal and the third type terminal may be the same terminal or may be different terminals.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification. Hereinafter, the base station may be at least one of an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. In the present invention, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a mobile station, and an uplink (UL) is a wireless transmission path of a signal transmitted from a mobile station to a base station. In the following, embodiments of the present invention will be described as an example of an LTE or LTE-A system, but embodiments of the present invention may be applied to other communication systems having a similar technical background or channel form. For example, 5G mobile communication technology developed after LTE-A (5G, new radio, NR) could be included. In addition, embodiments of the present invention may be applied to other communication systems by a person skilled in the art without departing from the scope of the present invention.

In the present invention, a transmission time interval (TTI) means a unit in which a control signal and a data signal are transmitted, or a unit in which a data signal is transmitted. For example, in a conventional LTE system downlink, a transmission time interval is a subframe that is a time unit of 1 ms. Meanwhile, in the present invention, the transmission time interval in the uplink means a unit in which a control signal or a data signal is sent, or a unit in which a data signal is transmitted. The transmission time interval in the existing LTE system uplink is a subframe that is the time unit of 1 ms which is the same as the downlink.

The shortened-TTI terminal described below may include a terminal capable of transmitting control information, data, or control information and data in a transmission time interval shorter than 1 ms or 1 ms, and the normal-TTI The terminal may include a terminal capable of transmitting control information, data, control information and data in a transmission time interval of 1 ms. In the present invention, shortened-TTI, shorter-TTI, shortened TTI, shorter TTI, short TTI, and sTTI have the same meaning and are used in combination. In the present invention, the normal-TTI, the normal TTI, the subframe TTI, and the legacy TTI have the same meaning and are used in combination. In the above, 1 ms, which is a criterion for distinguishing shortened-TTI from normal-TTI, may be different depending on the system. That is, in a specific NR system, the TTI is shortened-TTI if the TTI is shorter than 0.2 ms, and the normal TTI is 0.2 ms.

On the other hand, one of the important criteria of the performance of the cellular wireless communication system is the packet data latency. To achieve this, in the LTE system, transmission and reception of signals are performed in units of subframes having a transmission time interval (TTI) of 1 ms. The LTE system operating as described above may support a UE having a transmission time interval shorter than 1 ms (short-TTI UE). On the other hand, in NR, a fifth-generation mobile communication system, the transmission time interval may be shorter than 1 ms. Short-TTI terminals are expected to be suitable for services such as Voice over LTE (VoLTE) service and remote control, where latency is important. In addition, the short-TTI terminal is expected to be a means for realizing a mission-critical Internet of Things (IoT) on a cellular basis.

Hereinafter, the uplink scheduling grant signal and the downlink data signal are referred to as a first signal. Also, in the present invention, an uplink data signal for uplink scheduling grant and an HARQ ACK / NACK for a downlink data signal are referred to as a second signal. In the present invention, a signal transmitted from a base station to a mobile station may be a first signal, and a response signal from a mobile station corresponding to the first signal may be a second signal. In the present invention, the service type of the first signal may belong to categories such as eMBB, mMTC, and URLLC.

In the present invention, the TTI length of the first signal means the length of time during which the first signal is transmitted. In the present invention, the TTI length of the second signal means the length of time during which the second signal is transmitted. In the present invention, the second signal transmission timing is information on when the terminal transmits the second signal and when the base station receives the second signal, and may be referred to as a second signal transmission / reception timing.

In the present invention, when there is no mention of the TDD system, the FDD system will be generally described. However, the method and apparatus of the present invention in an FDD system may be applied to a TDD system according to a simple modification.

In the present invention, upper signaling is a signal transmission method that is transmitted from a base station to a base station using a downlink data channel of a physical layer or from a mobile station to a base station using an uplink data channel of a physical layer. The RRC signaling or MAC control element May be referred to as a control element (CE).

In the present invention, a method for uplink transmission without scheduling can be used in combination with grant-free uplink transmission, autonomous uplink transmission, and contention-based uplink transmission.

[Example 1-1]

The embodiment 1-1 provides a method of uplink transmission of an uplink transmission of data such as eMBB, URLLC, and mMTC without a scheduling from a base station, with reference to FIG. 1D and FIG. 1H.

In the present embodiment, description will be made on the basis of URLLC uplink transmission. The scheduling-free method is advantageous for URLLC transmission because it can reduce the scheduling delay time, but it does not need to be limited to URLLC transmission.

In FIG. 1D, the base station sets a portion (1d-04) of the entire uplink system frequency band 1d-00 to the UE as a URLLC transmission region. When the UELC generates data for URLLC transmission, the UE can transmit an uplink control signal, data, and a reference signal in the set area (1d-04). The uplink control signal may include at least one of the following control information.

- Resource block assignment: Indicates the RB or subband assigned to the data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Indicates the modulation scheme used for data transmission and the size of the transport block, which is the data to be transmitted.

- HARQ process number: Indicates the HARQ process number.

- New data indicator: Indicates whether HARQ is initial transmission or retransmission.

- Redundancy version: Indicates the redundancy version of HARQ.

- TTI length or repetition number: indicates the time interval over which data is transmitted. That is, it can indicate the number of OFDM or SC-FDMA symbols to be used, the number of slots, and the like.

- Terminal ID: Contains an indicator that indicates which terminal has transmitted.

The terminal ID information may be transmitted in the form of sequence information or a cyclic shift value of an uplink reference signal not included in the control signal but transmitted together with control and data signals.

In the present invention, the uplink control signal or the uplink control channel may include at least one of the parameters.

The control information may not necessarily be included in the uplink control signal, and at least one or more parameters may be included. For example, when encoding the control signal and adding the CRC, the terminal ID may be delivered to the base station in the form of an RNTI value scrambled or masked to the CRC. In this case, if the uplink control signal finds the RNTI value to be decoded successfully, the base station can know which terminal has transmitted the uplink control signal.

The terminal transmits the control signal and the data signal in the uplink transmission (1h-02). When the base station decodes the control signal to grasp the control information (1h-04), the base station can decode the data signal from the control information (1h-06). For example, if the control information includes resource block allocation and MCS, it is possible to receive a data signal from a corresponding allocated resource block, and demodulate using the MCS value.

[Example 1-2]

In the first to second embodiments, a UE sets up a set of parameters that can be included in an uplink control signal transmission to a UE for uplink transmission without scheduling from the Node B, The method is provided with reference to FIG.

The BS transmits (1i-02) a range or set of parameter types and parameter values that can be selected by the UE to the UE through higher signaling. The UE determines a parameter to be used for uplink data transmission without scheduling according to the upper signaling, and transmits the uplink control signal along with the used parameter information together with the uplink data (1i-04). In this case, the bit size of the uplink control signal can be determined according to the type of the parameter that can be used by the terminal and the value range of the parameter.

For example, in a case where a base station can determine only an MCS value, a base station transmits a set of MCS values that can be selected by a terminal to a mobile station in an upper signaling. The resource block allocation, the TTI length, and the like may be signaled by the base station so that the UE uses one fixed value. For example, if the MCS value that the UE can use is 0 to 31, the Node B may determine some of the MCS values based on the channel state from the UE, and set the MCS value to the UE. For example, it would be possible to use higher signaling to use only MCSs from 0 to 7. The upper signaling is a variable name such as grant_free_MCS, and it is possible to transmit the use of each MCS value as a bitmap, for example, as 32-bit information. Or 5 bits to indicate which MCS can be used. For example, in this case, if grant_free_MCS is 00111, it means that MCS values 0 to 7 can be used. In this case, the MS selects one of MCSs 0 to 7, uses it for uplink data transmission without scheduling, and transmits the MCS information to the BS in the uplink control signal. In this case, the number of bits required to carry one MCS value from 0 to 7 will be 3 bits.

The MCS value that can be used by the UE may be provided in a table irrespective of the service. For example, the MCS value for the eMBB and the URLLC can be set using the same table.

In this embodiment, the size of the uplink control information, that is, the number of bits is changed according to the setting of the base station. However, the number of bits is fixed and some bits may be filled with NULL or fixed values will be.

Although this embodiment has been described on the basis of the 1-1th embodiment, it is not necessary to be limited to the uplink transmission shown in the 1-1th embodiment.

[Examples 1-3]

The 1-3th embodiment provides a control signal transmission format and a mapping method for transmitting a control signal for an uplink data signal when the UE transmits in the uplink without scheduling from the base station in the 1-1th embodiment.

FIG. 1J is a diagram illustrating a state in which a frequency band (1j-04) for URLLC is preset for grant-free uplink transmission and the UE transmits an uplink in the corresponding region without scheduling approval from the base station. The terminal transmits data from frequency-time resources that can be sent when data to be transmitted is generated. In FIG. 1J, it is shown that scheduling-free transmission is possible in a specific frequency band at all times. However, it is also possible to set a time domain in which higher-order signaling allows transmission without scheduling.

The uplink transmission may include at least one of a control signal, a reference signal, and a data signal. FIG. 1J shows an example of resource mapping of the control signal, the reference signal, and the data signal. 1J shows an example in which the reference signal 1j-22, the uplink control information 1j-24, and the uplink data 1j-26 are transmitted in the same symbol. (A), (b), (c), and (d) of FIG. 1K are views showing another example in which at least one of a control signal, a reference signal, and a data signal is transmitted. 1K- (a) shows a case where the reference signal 1k-06, the uplink control information 1k-02 and the uplink data 1k-04 are transmitted in two or more symbols and the uplink control information 1k- ) Is transmitted in the preceding symbol. 1K- (b) is a diagram illustrating a method in which the uplink control information (1k-08) indicates uplink data (1k-10) transmission in a plurality of TTIs. 1K- (c), when the uplink control information 1k-12 and the uplink data 1k-14 are transmitted in different symbols, the uplink control information 1k-16 and the uplink control information 1k- And the case where the uplink data 1k-18 is transmitted in another frequency region.

In the uplink control signal, resource block allocation information indicating a frequency band in which uplink data is transmitted may be included. The frequency resource information may be obtained by dividing the entire frequency band (1l-00) set for grant-free by one or more subbands (1l-12, 1l-14, 1l-16, 1l-18) And then allocating the subbands. Therefore, the uplink control information (1l-02, 1l-04, 1l-06, 1l-08) is allocated to the uplink data (1l-22, 1l-24, 1l- Information.

Although this embodiment has been described on the basis of the 1-1th embodiment, it is not necessary to be limited to the uplink transmission shown in the 1-1th embodiment.

In order to perform the above-described embodiments of the present invention, a transmitter, a receiver and a processing unit of a terminal and a base station are shown in Figs. 1M and 1N, respectively. A method of transmitting and receiving a base station and a mobile station in order to determine a control signal, a reference signal, and a data signal for uplink transmission of a mobile station and performing an operation according to the control signal, the reference signal, and the data signal, In order to accomplish this, the base station and the receiving unit, the processing unit, and the transmitting unit of the terminal must operate according to the embodiments, respectively.

Specifically, FIG. 1M is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention. As shown in FIG. 1M, the terminal of the present invention may include a terminal reception unit 1m-00, a terminal transmission unit 1m-04, and a terminal processing unit 1m-02. The terminal receiving unit 1m-00 and the transmitting unit 1m-04 may collectively be referred to as transmitting and receiving units in the embodiment of the present invention. The transmitting and receiving unit can transmit and receive signals to and from the base station. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. In addition, the transceiving unit may receive a signal through a wireless channel, output it to the terminal processing unit 1m-02, and transmit the signal output from the terminal processing unit 1m-02 through a wireless channel. The terminal processing unit (1m-02) can control a series of processes so that the terminal can operate according to the above-described embodiment of the present invention. For example, the terminal processor 1m-02 receives setting information on the parameter type and range for uplink transmission from the base station in the terminal receiver 1m-00, and the terminal processor 1m- As shown in FIG. Then, the terminal transmission unit (1m-04) transmits the uplink control signal, the reference signal, and the data signal.

1n is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention. 1, the base station of the present invention may include a base station receiving unit 1n-01, a base station transmitting unit 1n-05, and a base station processing unit 1n-03. The base station receiving unit 1n-01 and the base station transmitting unit 1n-05 may be collectively referred to as a transmitting and receiving unit in the embodiment of the present invention. The transmitting and receiving unit can transmit and receive signals to and from the terminal. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. In addition, the transmitting and receiving unit receives a signal through a wireless channel, outputs the signal to the base station processing unit 1n-03, and transmits the signal output from the terminal processing unit 1n-03 through a wireless channel. The base station processing unit (1n-03) can control a series of processes so that the base station can operate according to the above-described embodiment of the present invention. For example, the base station processing unit (1n-03) can determine the parameter type and range of a control signal required for uplink transmission and control to generate upper signaling information to be transmitted to the terminal. Thereafter, the base station transmitter 1n-05 transmits the corresponding parameter information through higher signaling, and the base station receiver 1n-01 receives the control signal, the reference signal, and the data signal from the terminal.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible. In addition, each of the above embodiments can be combined and operated as needed. For example, the base station and the terminal may be operated by combining the parts of the 1-1 and 1-2 embodiments of the present invention. Although the above embodiments are presented on the basis of the 5G system, other systems based on the technical idea of the embodiment may be applicable to other systems such as an LTE system.

≪ Embodiment 2 >

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

It will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in this embodiment refers to a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card. Also, in an embodiment, 'to' may include one or more processors.

For example, 3GPP's High Speed Packet Access (HSPA), LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced To a broadband wireless communication system that provides high-speed, high-quality packet data services such as the LTE-A, 3GPP2 high rate packet data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e communication standards. . In addition, a 5G or NR (new radio) communication standard is being produced with the fifth generation wireless communication system.

In this way, at least one service of Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC), and URLLC (Ultra-Reliable and Low-latency Communications) can be provided to the terminal in a wireless communication system including the fifth generation have. The services can be provided to the same terminal during the same time period. In the embodiment, the eMBB may be a high-speed transmission of high-capacity data, the mMTC may be a terminal power minimization and a connection of a plurality of terminals, and the URLLC may be a service aiming at high reliability and low latency. The above three services may be a major scenario in a LTE system or a system such as 5G / NR (new radio, next radio) after LTE. In the embodiment, coexistence of eMBB and URLLC, coexistence of mMTC and URLLC, and apparatus using the same will be described.

When a base station has scheduled a data corresponding to an eMBB service in a specific transmission time interval (TTI) to a UE, when a situation occurs in which the URLLC data should be transmitted in the TTI, the eMBB data is already scheduled It is possible to transmit the generated URLLC data in the frequency band without transmitting a part of the eMBB data in the frequency band to which the data is transmitted. The UEs scheduled for the eMBB and the UEs scheduled for the URLLC may be the same UE or may be different UEs. In such a case, there is a possibility that the eMBB data is damaged because a portion of the eMBB data that has already been scheduled and transmitted has not been transmitted. Therefore, in the above case, it is necessary to determine a method of processing a signal received from a terminal that is scheduled for eMBB or a terminal that is scheduled for URLLC and a signal receiving method. Therefore, when the information according to eMBB and URLLC is scheduled, or information according to mMTC and URLLC are scheduled simultaneously, or information according to mMTC and eMBB is scheduled simultaneously, sharing the part or whole frequency band, or The coexistence method between heterogeneous services that can transmit information according to each service when the information according to eMBB, URLLC and mMTC are scheduled simultaneously is described.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification. Hereinafter, the base station may be at least one of an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. In the present invention, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a mobile station, and an uplink (UL) is a wireless transmission path of a signal transmitted from a mobile station to a base station. In the following, embodiments of the present invention will be described as an example of an LTE or LTE-A system, but embodiments of the present invention may be applied to other communication systems having a similar technical background or channel form. For example, 5G mobile communication technology developed after LTE-A (5G, new radio, NR) could be included. In addition, embodiments of the present invention may be applied to other communication systems by a person skilled in the art without departing from the scope of the present invention.

In the LTE system, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is used in a downlink (DL) and a Single Carrier Frequency Division Multiple (SC-FDMA) scheme is used in an uplink Access) method. The uplink refers to a wireless link that transmits data or control signals to a terminal (User Equipment, UE) or a mobile station (MS) to a base station (eNode B or base station (BS) In the above multiple access scheme, time / frequency resources to transmit data or control information for each user are not overlapped with each other, that is, orthogonality So that data or control information of each user can be distinguished.

The LTE system adopts a Hybrid Automatic Repeat reQuest (HARQ) scheme in which a physical layer resends data when a decoding failure occurs in an initial transmission. In the HARQ scheme, if a receiver fails to correctly decode (decode) data, the receiver transmits information indicating a decoding failure (NACK: Negative Acknowledgment) to the transmitter so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with the previously decoded data to improve data reception performance. In addition, when the receiver correctly decodes the data, an acknowledgment (ACK) indicating the decoding success is transmitted to the transmitter so that the transmitter can transmit new data.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. Further, in order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network (D2D), a wireless backhaul, a moving network, a cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation ) Are being developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas, which are 5G communication technologies will be. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 2eG technology and IoT technology.

As described above, a plurality of services can be provided to a user in the communication system, and a method and a device using the method that can provide each service within the same time interval in accordance with the characteristics to provide the plurality of services to the user are required . Also, certain services may require faster transmission times than other services. That is, it requires a small transmission time.

The embodiments of the present invention have been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and an apparatus for simultaneously providing different types of services.

FIG. 2A is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in a downlink in an LTE system or a similar system.

Referring to FIG. 2A, the horizontal axis represents time domain and the vertical axis represents frequency domain. The minimum transmission unit in the time domain is an OFDM symbol. N _symb (2a 02) OFDM symbols constitute one slot 2a 06, and two slots form one sub-frame 2 a 05. The length of the slot is 0.5 ms and the length of the subframe is 1.0 ms. The radio frame 2a14 is a time domain including 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the total system transmission bandwidth is composed of a total of N _BW (2 044) subcarriers. However, such specific values can be applied variably.

In a time-frequency domain, a basic unit of a resource can be represented by an OFDM symbol index and a subcarrier index as a resource element (resource element) A Resource Block (RB) or Physical Resource Block (PRB) resource block may be defined as N _symb (2a02) consecutive OFDM symbols in the time domain and N _RB (2a10) consecutive subcarriers in the frequency domain. Therefore, one RB 2a08 in one slot may include N _symb x N _RB REs 2a12. In general, the frequency-domain minimum allocation unit of data is the RB, and in the LTE system, N _symb = 7 and N _RB = 12, and N _BW and N _RB may be proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the UE. The LTE system can define and operate six transmission bandwidths. In the case of an FDD system in which the downlink and the uplink are classified by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 2a below shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth can have a transmission bandwidth of 50 RBs.

[Table 2a]

The downlink control information may be transmitted within the first N OFDM symbols in the subframe. In the embodiment, N = {1, 2, 3} in general. Therefore, the N value can be variably applied to each subframe according to the amount of control information to be transmitted in the current subframe. The transmitted control information may include a control channel transmission period indicator indicating how many OFDM symbols control information is transmitted, scheduling information for downlink data or uplink data, and HARQ ACK / NACK information.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from a base station to a mobile station through downlink control information (DCI). The DCI is defined according to various formats, and it is determined according to each format whether the scheduling information (UL grant) for the uplink data or the scheduling information (DL grant) for the downlink data, whether the size of the control information is compact DCI , Whether to apply spatial multiplexing using multiple antennas, whether DCI is used for power control, and so on. For example, DCI format 1, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

- Resource allocation type 0/1 flag: Indicates whether the resource allocation scheme is Type 0 or Type 1. Type 0 allocates resources by resource block group (RBG) by applying bitmap method. In the LTE system, the basic unit of scheduling is an RB represented by time and frequency domain resources, and the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in the type 0 scheme. Type 1 allows a specific RB to be allocated within the RBG.

- Resource block assignment: Indicates the RB allocated to the data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Indicates the modulation scheme used for data transmission and the size of the transport block (TB), which is the data to be transmitted.

- HARQ process number: Indicates the HARQ process number.

- New data indicator: Indicates whether HARQ is initial transmission or retransmission.

- Redundancy version: Indicates the redundancy version of HARQ.

- Transmit Power Control (TPC) command for PUCCH for Physical Uplink Control CHannel: Indicates a transmission power control command for the uplink control channel PUCCH.

The DCI is a physical downlink control channel (PDCCH) (or control information), or an Enhanced PDCCH (Enhanced PDCCH) (or enhanced control information, hereinafter referred to as " It may be used on a mixed basis).

Generally, the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or a mobile station identifier) independently of each mobile station, and a cyclic redundancy check (CRC) is added, channel-coded and then composed of independent PDCCHs . In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal, and can be transmitted over the entire system transmission band.

The downlink data may be transmitted on a physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission. PDSCH may be transmitted after the control channel transmission interval, and scheduling information such as a specific mapping position and a modulation scheme in the frequency domain is determined based on the DCI transmitted through the PDCCH.

Through the MCS among the control information constituting the DCI, the BS notifies the MS of the modulation scheme applied to the PDSCH to be transmitted and the transport block size (TBS) to be transmitted. In an embodiment, the MCS may be composed of 5 bits or more or fewer bits. The TBS corresponds to a size before channel coding for error correction is applied to a data block (TB) to be transmitted by the base station.

The modulation schemes supported by the LTE system are QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and 64QAM, and the respective modulation order (Qm) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation. Also, according to the system modification, a modulation method of 256QAM or more can be used.

2B is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which an uplink data or control channel is transmitted in an LTE-A system.

Referring to FIG. 2B, the horizontal axis represents time domain and the vertical axis represents frequency domain. The minimum transmission unit in the time domain is an SC-FDMA symbol 2b02, and N _symb ^UL SC-FDMA symbols can be gathered to form one slot 2b06. Then, two slots form one subframe 2b05. The minimum transmission unit in the frequency domain is a subcarrier, the entire system transmission band; is (transmission bandwidth 2b04) is composed of a total of N _BW subcarriers. N _BW may have a value proportional to the system transmission band.

The basic unit of resources in the time-frequency domain is a resource element (RE) 212, which can be defined as an SC-FDMA symbol index and a subcarrier index. A resource block pair (RB pair) 2b08 may be defined as N _symb ^UL consecutive SC-FDMA symbols in the time domain and N _SC ^RB consecutive subcarriers in the frequency domain. Therefore, one RB consists of N _symb ^UL x N _SC ^RB REs. In general, the minimum transmission unit of data or control information is RB unit. In case of PUCCH, it is mapped to a frequency region corresponding to 1 RB and transmitted for 1 sub-frame.

In the LTE system, an uplink physical channel PUCCH or PUSCH, to which HARQ ACK / NACK corresponding to a PDCCH / EPDDCH including a physical channel for downlink data transmission or a semi-persistent scheduling release (SPS release) Can be defined. For example, in an LTE system operating in a frequency division duplex (FDD), a HARQ ACK / NACK corresponding to a PDCCH / EPDCCH including PDSCH or SPS release transmitted in an n-4th subframe is transmitted as a PUCCH or a PUSCH Lt; / RTI >

In the LTE system, the downlink HARQ employs an asynchronous HARQ scheme in which the data retransmission time is not fixed. That is, when HARQ NACK is fed back from the UE to the initial transmission data transmitted from the BS, the BS freely determines the transmission time point of the retransmission data by the scheduling operation. The UE may perform buffering on the data determined to be an error as a result of decoding the received data for HARQ operation, and then perform the combining with the next retransmission data.

When the UE receives the PDSCH including the downlink data transmitted from the base station in the subframe n, the UE transmits the uplink control information including the HARQ ACK or NACK of the downlink data to the subframe n + k through the PUCCH or PUSCH, Lt; / RTI > Here, k may be defined differently according to FDD or TDD (time division duplex) of the LTE system and its subframe setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number. In addition, the value of k may be differently applied according to the TDD setting of each carrier at the time of data transmission through a plurality of carriers.

Unlike the downlink HARQ in the LTE system, the uplink HARQ adopts a synchronous HARQ scheme in which the data transmission time is fixed. That is, a physical uplink shared channel (PUSCH), a downlink control channel (PDCCH), and a physical hybrid (PHICH) physical channel, in which a downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted, Indicator Channel) can be transmitted and received according to the following rule.

When the UE receives the PDCCH including the uplink scheduling control information transmitted from the base station in the subframe n or the PHICH in which the downlink HARQ ACK / NACK is transmitted, the UE transmits uplink data corresponding to the control information in the subframe n + k PUSCH. Here, k may be defined differently depending on the FDD or TDD (time division duplex) of the LTE system and its setting. For example, in the case of the FDD LTE system, the k can be fixed to 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number. In addition, the value of k may be differently applied according to the TDD setting of each carrier at the time of data transmission through a plurality of carriers.

When the UE receives a PHICH including information related to a downlink HARQ ACK / NACK from a base station in a subframe i, the PHICH corresponds to the PUSCH transmitted by the UE in the subframe i-k. Here, k may be defined differently depending on the FDD or TDD of the LTE system and its setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number. In addition, the value of k may be differently applied according to the TDD setting of each carrier at the time of data transmission through a plurality of carriers.

The description of the wireless communication system is based on the LTE system, and the contents of the present invention are not limited to the LTE system but can be applied to various wireless communication systems such as NR and 5G. Also, in a case where the present invention is applied to another wireless communication system, the k value may be changed and applied to a system using a modulation scheme corresponding to the FDD.

FIGS. 2C and 2D illustrate the allocation of data for eMBB, URLLC, and mMTC, which are services considered in the 5G or NR system, in frequency-time resources.

Referring to FIG. 2C and FIG. 2D, a method in which frequency and time resources are allocated for information transmission in each system can be seen.

In FIG. 2C, data for eMBB, URLLC, and mMTC are allocated in the total system frequency band 2c00. When the URLLC data 2c03, 2c05, 2c07 is generated while the eMBB 2c01 and the mMTC 2c09 are allocated and transmitted in a specific frequency band and transmission is required, the eMBB 2c01 and the mMTC 2c09 are allocated to the already allocated portion The URLLC data 2c03, 2c05, 2c07 can be transmitted without transmitting or transmitting the URLLC data 2c03, 2c05, 2c07. Among the above services, since the URLLC needs to reduce the delay time, URLLC data can be allocated (2c03, 2c05, 2c07) to a part of the resource 2c01 allocated to the eMBB. Of course, when URLLC is further allocated and transmitted in the resource to which the eMBB is allocated, the eMBB data may not be transmitted in the overlapping frequency-time resources, and thus the transmission performance of the eMBB data may be lowered. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.

In FIG. 2D, the entire system frequency band 2d00 may be divided and used to transmit services and data in the respective subbands 2d02, 2d04, and 2d06. The information related to the subband setting can be predetermined, and the information can be transmitted to the base station through the upper signaling. Alternatively, information related to the subbands may be provided by the base station or the network node without any separate subband configuration information being transmitted to the terminal. In FIG. 2D, the subband 2d02 is used for eMBB data transmission, the subband 2d04 is used for URLLC data transmission, and the subband 2d06 is used for mMTC data transmission.

The length of the transmission time interval (TTI) used in the URLLC transmission in the first embodiment may be shorter than the TTI length used in the eMBB or mMTC transmission. Also, the response of the information related to the URLLC can be transmitted faster than the eMBB or mMTC, so that information can be transmitted and received with a low delay.

The eMBB service described below will be referred to as a first type service and the eMBB data will be referred to as first type data. The first type service or the first type data is not limited to the eMBB, but may be applied to a case where high-speed data transmission is required or a broadband transmission is performed. The URLLC service is referred to as a second type service, and the data for URLLC is referred to as second type data. The second type service or second type data is not limited to URLLC, but may be applicable to other systems requiring a low delay time, requiring high reliability transmission, or requiring low latency and high reliability at the same time. The mMTC service is called a third type service, and the mMTC data is called a third type data. The third type service or the third type data is not limited to mMTC but may be applicable to a case where a low speed, wide coverage, or low power is required. Further, in describing the embodiment, it can be understood that the first type service includes or does not include the third type service.

The structure of the physical layer channel used for each type may be different in order to transmit the three services or data. For example, at least one of a transmission time interval (TTI) length, a frequency resource allocation unit, a control channel structure, and a data mapping method may be different.

Although three services and three pieces of data have been described above, there are more kinds of services and corresponding data. In this case, the contents of the present invention can be applied.

The terms physical channel and signal in a conventional LTE or LTE-A system may be used to describe the method and apparatus proposed in the embodiment. However, the contents of the present invention can be applied to wireless communication systems other than LTE and LTE-A systems.

As described above, the embodiment defines transmission and reception operations of a first type, a second type, a third type service, and a terminal and a base station for data transmission, and transmits terminals having different types of services or data scheduling to the same system We suggest a concrete method to operate together. In the present invention, the first type, the second type and the third type terminals are respectively referred to as terminals of type 1, type 2, type 3, or data scheduling. In an embodiment, the first type terminal, the second type terminal and the third type terminal may be the same terminal or may be different terminals.

Hereinafter, at least one of an uplink scheduling grant signal and a downlink data signal is referred to as a first signal. Also, in the present invention, at least one of an uplink data signal for uplink scheduling grant and an HARQ ACK / NACK for a downlink data signal is referred to as a second signal. In an exemplary embodiment, a signal transmitted from a base station to a mobile station may be a first signal if it is a signal expecting a response from the mobile station, and a response signal from a mobile station corresponding to the first signal may be a second signal. Also, in the embodiment, the service type of the first signal may be at least one of eMBB, URLLC, and mMTC, and the second signal may also correspond to at least one of the services.

In the following embodiments, the TTI length of the first signal may indicate the length of time during which the first signal is transmitted with a time value related to the first signal transmission. Also, in the present invention, the TTI length of the second signal may indicate the length of time that the second signal is transmitted with a time value related to the second signal transmission, and the TTI length of the third signal may be shorter than the time related to the third signal transmission Value may represent the length of time the third signal is transmitted. In the present invention, the second signal transmission timing is information on when the terminal transmits the second signal and when the base station receives the second signal, and may be referred to as a second signal transmission / reception timing.

The contents of the present invention are applicable to FDD and TDD systems.

In the present invention, upper signaling is a signal transmission method that is transmitted from a base station to a mobile station using a downlink data channel of a physical layer or from a mobile station to a base station using an uplink data channel of a physical layer, and includes RRC signaling or PDCP signaling , Or a MAC control element (MAC CE).

The contents of the present invention are applicable to FDD and TDD systems.

2E is a diagram illustrating a self-contained structure in which the uplink and the downlink exist in one subframe in the communication system.

FIG. 2E shows an uplink 2e04 and a downlink 2e00 in one subframe, and a guard interval 2e02 necessary for switching between the two. The guard interval 2e02 includes a time required for processing required for switching from a downlink to an uplink between a base station and a mobile station, a time required for aligning a transmission time between the base station and the mobile station, and the like. Therefore, the guard interval 2e02 may have a different time value depending on the performance of the terminal and the base station and the distance between the terminal and the base station. In addition, the roles of the uplink 2e04 and the downlink 2e00 may be changed, and the time length may be expressed differently from that depicted in the figure. In the present invention, the downlink 2e00, the guard interval 2e02, and the uplink 2e04 will be described.

FIG. 2F is a view showing a feedback on the result of the initial transmission on the self-supporting structure of Time Division Duplexing (TDD).

FIG. 2F illustrates a case where initial transmission is performed in the n-th subframe or a slot or a transmission time interval (TTI) in a downlink 2f00, the decoding of the initial downlink transmission 2f06, (2f08) in which the UE reports the result using the (n + 2) th uplink resource (2f04). That is, the UE can determine the decoding result for the downlink initial transmission after the downlink of the n < th > subframe or slot or transmission period is terminated. In addition, feedback for the n-th downlink initial transmission result may be n + 1, n + 3, n + 4 instead of n + 2. In the drawing, it is assumed that n + 2 is assumed. The values to be described in the following are also examples described in the present invention, and all of them can be applied to other values. The decoding result reports two types of success or failure of the initial transmission.

FIG. 2G is a diagram showing a quick feedback on the result of the initial transmission on the self-sustaining structure of time division multiplexing.

FIG. 2G shows a result of a part (2g08) of the n-th downlink initial transmission in order to inform the result of the faster feedback transmission in the n-th subframe or slot or transmission interval through the uplink resource in the (n + The situation reported by the terminal (2g10). When the situation is possible, it is explained as follows. The n < th > downlink initial transmission consists of one transport block 2g00, and one transport block is composed of several code blocks. The UE determines that decoding of the corresponding transport block is successful by successfully decoding all of the code blocks, and reports the result to the base station. If at least one of the code blocks fails to decode, the UE determines that decoding of the corresponding transport block has failed and reports the result to the base station. Accordingly, the UE can transmit the n < th > downlink initial transmission data 2g00 in a state where it can sequentially decode the code blocks constituting the corresponding transport block during the n < th > downlink transmission interval, If the initial code block decoding fails, the UE can report the corresponding transport block decoding failure result to the BS regardless of the decoding result of the subsequent code block. Therefore, if the feedback result report for the n-th downlink initial transmission is performed through the (n + 2) -th uplink resource in FIG. 2F, if a failure occurs in the n-th downlink initial transmission, and may be performed early through the (n + 1) th uplink resource. That is, it can report the result in 1 or 2 subframes, slots or transmission periods ahead of the situation of FIG. 2f. In order to inform (2g10) that the decoding result for the n-th downlink is informed to the (n + 1) th uplink resource, a part (2g06) of the nth downlink initial transmission and a part The code block set (2g08) must be set in advance. Therefore, the period 2g06 of the initial transmission needs to be set in advance in consideration of various values including the performance of the terminal and the base station, and the distance between the terminal and the base station. In addition, it should be noted that a plurality of code blocks constituting one transport block must be frequency-first mapped (Time First Mapping) rather than time-first mapped to facilitate the corresponding operation. The uplink fast report (2g10) at the (n + 1) th result of the portion (2g06) of the nth downlink initial transmission is generated when the corresponding initial transmission part (2g06) decoding fails. If decoding of the initial transmission part (2g06) is successful, the uplink fast report (2g10) in the (n + 1) th is not generated. This is because decoding of the remaining portion may fail even if decoding of the portion (2g06) of the initial transmission is successful. Therefore, it is meaningless to report the decoding result of the part (2g06) of the initial transmission. Therefore, in this case, the UE informs the decoding result to the (n + 2) th uplink after the nth downlink initial transmission is completed as shown in FIG. In the present invention, the n-th fast feedback report may be informed through an n-th uplink resource other than n + 1. Also, a part of the n < th > downlink initial transmission determined for quick feedback reporting is referred to as first type data, and other data is assumed to be second type data. That is, some of the code blocks constituting one transport block used for initial transmission are referred to as first type data, and the remaining code block sets are assumed to be second type data. In addition, one feedback block can be performed by dividing one transmission block into three or four types rather than two types. The method for dividing the first type data and the second type data may be determined by a decoding processing capability of the terminal, a size of the corresponding transmission block, a distance between the terminal and the base station, etc., Can be shared statically through sharing information dynamically or acquiring system information. In addition, if the values that serve as a reference for dividing the first type data and the second type data can be pre-shared values between the terminal and the base station, the base station and the terminal can implicitly calculate corresponding values, respectively, Can operate. For example, when it is assumed that the UE receives a transport block (TB) size α, the size of the first type data may be calculated as αxβ and defined as the value. Here, β is a value between 0 and 1, and is considered as a reference value for processing the first type data and reporting the decoding result to the uplink resource. The second type data can be calculated by calculating αx (1-β), and can be defined as the value. In a situation where various transport block sizes exist, the UE and the BS may select one of various values of < RTI ID = 0.0 > a < / RTI > value according to the decoding capability of the UE in advance and report it to the UE. Alternatively, it is possible to set the size of the first type data to an absolute value in addition to the above method, and to operate by previously sharing the size of the first type data with the base station and the terminal.

According to the above method, the feedback report on the first type data on the n-th downlink only indicates the corresponding data decoding failure on the (n + 1) -th uplink, and the feedback report for the first type data and the second type data on the n- Indicates the decoding success and failure of the corresponding data on the (n + 2) th uplink. Therefore, when the base station receives decoding failure in the (n + 1) -th uplink resource, it transmits the transport block used in the initial transmission more quickly than when the base station receives decoding failure in the (n + 2) You can give. For example, when the UE reports feedback failure in the (n + 1) th UE, the Node B can retransmit the corresponding UE in the (n + 3) th UE. and the retransmission of the corresponding transport block can be performed in the (n + 4) th.

The feedback reporting on the first type data on the n < th > downlink informs the corresponding data decoding success and failure on the (n + 1) < th > uplink and the feedback report on the second type data on the n & and informs the decoding success and failure of the corresponding data on the (n + 2) th uplink. When using the above method, the BS can perform retransmission for the first type data in the (n + 3) th time when the UE reports feedback failure in the (n + 1) The base station can perform retransmission for the second type data in the (n + 4) th. That is, in the above situation, the UE transmits to the BS a single transmission block divided into the first type data and the second type data, and transmits each feedback result report in the uplink in the other subframe, slot or transmission interval, And a method of performing retransmission according to the feedback result will be considered.

The above scheme can be performed not only for the retransmission operation for the initial transmission but also for the retransmission operation for the retransmission.

Figure 2h shows how the feedback on the results of the initial transmission and the fast feedback on the results of the initial transmission on the independent structure of the time division multiplexing use the same resource.

2H shows a result of feedback for the initial transmission (2h04) of the downlink (2h00) in the nth subframe or slot or transmission interval is reported as the uplink (2h14) in the n + 2th subframe or slot or transmission interval Show situation (2h10). In addition, a fast feedback result for a part (2h08) of the initial transmission of the downlink (2h06) in the (n + 1) th subframe or slot or transmission period is the result of the fast feedback of the uplink ) (2h12). It is possible to support feedback reporting for each transmission at the nth and (n + 1) th through (n + 2) th uplinks (2h14) through the use of various methods. First, if the UEs are the same or different, the feedback for the n-th transmission and the feedback for the (n + 1) -th transmission can be differentiated through different feedback time and frequency resource use, respectively. Also, if the UEs are the same, the feedback for the n-th transmission and the feedback for the (n + 1) -th transmission can be informed by using the same feedback time and frequency resources. That is, if the feedback for the n-th transmission and the feedback for the n + 1-th transmission are both successful, feedback indicating success is notified in the (n + 2) -th uplink transmission, If at least one of them fails, feedback indicating failure is informed in the (n + 2) th uplink transmission. The related information may be directly informed to the terminal through the control information before the initial transmission, or may be implicitly performed by the terminal through the resource relationship. That is, when two or more transmission reports are overlapped in the (n + 2) -th uplink, they can be individually reported according to the conditions or can be reported at once using the same resources. Or transmits the n-th downlink transmission report using the resources for which the first type data is used, in a situation where reporting of the (n + 1) th first type data only reports failure information. For example, if the reporting of the first type data is a failure, the first time-frequency resource (2m02) in FIG. 2m is used, and if reporting of the first type data is not a failure, When using the time-frequency resource (2m04), the base station can detect the feedback report on the first type data through energy detection in the two resource regions. In addition, the feedback report report for the n-th downlink initial transmission is reported through the first time-frequency resource (2m02) when the feedback result for the (n + 1) th first type downlink data fails. Alternatively, if the feedback result for the (n + 1) th type first downlink data is successful, it is reported through the second time-frequency resource (2m04). The first time-frequency resource and the second time-frequency resource may be set differently according to different time or frequency positions.

FIG. 2I is a diagram showing feedback of the result of initial transmission in Frequency Division Duplexing (FDD).

FIG. 2I shows a situation (2i02) of feeding back the decoding result of the corresponding transport block to the (n + 4) th uplink (2i08) with respect to the transport block 2j04 transmitted on the nth downlink 2i00. Upon receiving the transport block on the n-th downlink, the UE decodes the code block constituting the transport block transmitted through the n-th downlink through its decoder (2i06). In order to report the decoding result in the uplink, a value other than n + 4 may be applied, which is determined according to the performance of the Node B and the UE and the distance between the Node B and the UE.

FIG. 2J is a diagram illustrating fast feedback of the results of the initial transmission in frequency division multiplexing.

FIG. 2J shows a result of decoding only the first type data 2j06, which is a part of the code blocks constituting the transport block 2j08, for the transport block transmitted in the n-th downlink 2j00, (2j04) reported by (2j04). At this time, the report may report only the decoding failure for the part (2j04) of the transmission block, or may report both success or failure. The n + 2 and n + 1 values, which are faster than n + 3, can be used for the feedback transmission report depending on the terminal and base station performance, the distance between the terminal and the base station, and the size of a part of the transmission block (2j04). This is determined by the decoding processing capability of the terminal, the size of the first type data set, and the distance between the terminal and the base station. If the first and second types of data are values that are used as reference values for dividing the second type data, which is data other than the first type data in the transmission block, the base station and the terminal may implicitly It can work on the assumption that each value is calculated and determined by itself and that they know each other. For example, when it is assumed that the UE receives a transport block (TB) size α, the size of the first type data may be calculated as αxβ and defined as the value. Here, β is a value between 0 and 1, and is considered as a reference value for processing the first type data and reporting the decoding result to the uplink resource. The second type data can be calculated by calculating αx (1-β), and can be defined as the value. In a situation where various transport block sizes exist, the UE and the BS may select one of various values of < RTI ID = 0.0 > a < / RTI > value according to the decoding capability of the UE in advance and report it to the UE. Alternatively, it is possible to set the size of the first type data to an absolute value in addition to the above method, and to operate by previously sharing the size of the first type data with the base station and the terminal. The sharing of the information between the terminal and the base station can be performed by a dynamic method using control information and a quasi-method using system control information broadcasting.

FIG. 2K is a diagram showing different feedbacks on the results of each initial transmission in frequency division multiplexing.

2k reports the decoding result of the transport block 2k10 transmitted on the n-th downlink 2k00 to the report 2k02 and 2k12 on the n + 3th uplink and the n + 4th uplink 2k04, respectively Lt; / RTI > Here, a part of the nth downlink transmission block 2k10 for feedback reporting to the (n + 3) th uplink is referred to as first type data 2k06, and the remaining part for feedback reporting to the (n + It is called type data (2k08). In the above situation, the respective data decoding results reported in the (n + 3) th uplink and the (n + 4) th uplink are all reported as success or failure. The base station performs the first type data retransmission or the second type data retransmission in each of the other subframe, slot, or transmission interval through the feedback report received through the uplink resource. The sizes of the first type and second type data are determined by the performance of the terminal and the base station and the distance between the terminal and the base station. In addition, the size information of the first type and the second type data may be explicitly known in advance through the signaling exchange between the UE and the BS or implicitly through the other reference values. The reference value may be determined by a timing advance value or a terminal performance value. Therefore, the feedback reported in the (n + 3) th or (n + 4) th uplink determines whether the UE has set the value of the first type data and the second type data based on the value of the first type data and the second type data, And determines the data to be used for retransmission.

FIG. 21 is a diagram showing how the same feedback is used for the result of the initial transmission and the fast feedback for the result of the initial transmission in the frequency division multiplexing.

FIG. 21 shows the result report (2 110) of the n-th downlink (2 100) transmission block and the feedback report report (2 100) for a part of the (n + 1) And the situation occurring in the link (2014). It is possible to support feedback reporting on each downlink transmission at the n-th and (n + 1) -th uplink (2h14) through the use of various methods. First, if the UEs are the same or different, the feedback for the n-th downlink transmission and the feedback for the (n + 1) -th downlink transmission can be differentiated through use of different feedback time and frequency resources, respectively. Also, if the UEs are the same, the feedback for the n < th > downlink transmission and the feedback for the (n + 1) < th > downlink transmission can be informed through use of the same feedback time and frequency resources. That is, if the feedback for the n-th downlink transmission and the feedback for the n + 1-th downlink transmission are both successful, feedback indicating success is notified in the (n + 4) th uplink transmission, If at least one of the n + 1th downlink transmissions fails, feedback indicating failure is informed in the (n + 4) th uplink transmission. The related information may be directly informed to the terminal through the control information before the initial transmission, or may be implicitly performed by the terminal through the resource relationship. That is, when two or more transmission reports overlap in the (n + 4) -th uplink, they can be reported separately according to the condition or reported at once using the same resource. Or transmits the n-th downlink transmission report using the resources for which the first type data is used, in a situation where reporting of the (n + 1) th first type data only reports failure information. For example, if the reporting of the first type data is a failure, the first time-frequency resource (2m02) in FIG. 2m is used, and if reporting of the first type data is not a failure, When using the time-frequency resource (2m04), the base station can detect the feedback report on the first type data through energy detection in the two resource regions. In addition, the feedback report report for the n-th downlink initial transmission is reported through the first time-frequency resource (2m02) when the feedback result for the (n + 1) th first type downlink data fails. Alternatively, when the feedback result for the (n + 1) th type first downlink data is successful, it is reported through the second time-frequency resource (2m04). The first time-frequency resource and the second time-frequency resource may be set differently according to different time or frequency positions within the (n + 1) th uplink subframe or slot or transmission interval.

2M is a view showing a time-frequency resource for reporting fast feedback and feedback together.

Figure 2m illustrates how to report feedback on two initial transmissions as previously described. In a situation where the first feedback method reports only the failure for the transmission and the second feedback method reports the success and failure of the transmission, the terminal reports the second feedback result through the first time-frequency resource (2m02) , It implicitly indicates that the first feedback result is failure. In addition, when the UE informs the second feedback result through the second time-frequency resource (2m04), it implicitly informs that the second feedback result is success. Thus, the base station may decode the feedback results over the first time-frequency and the second time-frequency, and may concurrently determine the first feedback and the second feedback result.

[Example 2-1]

2n is a diagram illustrating a terminal operation according to the embodiment 2-1.

In FIG. 2, the UE sequentially decodes the first type data, and determines whether to report or not to report a decoding result for the second type data according to the result. That is, if the decoding result for the first type data fails, the feedback of the first type data is easily possible because the transmission of the corresponding transmission block is finally reported to the base station as decoding failure. Here, it is assumed that the UE reports the failure of the corresponding transport block even if the first type data decoding fails, but performs the second type data decoding. Even if the decoding of the second type data is repeated in the future retransmission, the operation considering the soft combining is utilized.

Specifically, the terminal first performs the first type data decoding (2n00). If decoding (2n02) for the first type data fails, the terminal decodes (2n06) the second type data and transmits decode failure information for the first type to the base station via the allocated uplink resource (2n10) do. If the decoding (2n02) for the first type data fails, the terminal decodes the second type data (2n04), and according to the decoding result of the second type data, the success of the first and second type data and the second The failure information of the type data is transmitted to the base station through the allocated uplink resources (2n08).

[Example 2-2]

2O is a diagram illustrating a terminal operation according to the embodiment 2-2.

In FIG. 20, the terminal sequentially decodes the first type data, and determines whether to report or not to report the decoding result for the second type data according to the result. That is, if the decoding result for the first type data fails, the feedback of the first type data is easily possible because the transmission of the corresponding transmission block is finally reported to the base station as decoding failure. Here, it is assumed that the UE reports the failure of the corresponding transport block even if the first type data decoding fails, but does not perform the second type data decoding. The UE may not be able to perform the second type data decoding together for the feedback report with the corresponding allocated uplink resources for the first type. In this situation, the terminal performs the second type data decoding after reporting the decoding result for the first type.

Specifically, the terminal first performs the first type data decoding (2o00). If decoding (2o02) for the first type data fails, decode failure information for the first type is transmitted (2o06) to the base station via the allocated uplink resource. If the decoding (2o02) for the first type data fails, the terminal decodes (2o04) the second type data, and according to the decoding result of the second type data, The failure information of the type data is transmitted to the base station through the allocated uplink resource (2o08).

[Example 2-3]

2P is a diagram illustrating a terminal operation according to the embodiment 2-3.

In FIG. 2P, if the decoding is unsuccessful after decoding the first type data first, the transmission block in the next subsequent operation including both the first type data and the second type data is retransmitted I expect to be. If the decoding for the first type data is successful and the decoding for the second type data thereafter fails, the terminal transmits both the first type data and the second type data in the downlink transmission in the next subsequent operation It is expected that the transmission block to be retransmitted will be retransmitted.

In summary, the terminal fails at least decoding (2p02, 2p04) among the first type data or the second type data, and re-receives data including both the first type data and the second type data in the subsequent set downlink resource (2p06). If the terminal succeeds in decoding both the first type data and the second type data, next new data is received (Step 2p08) from the next set downlink resource.

[Example 2-4]

FIG. 2Q is a diagram illustrating a terminal operation according to the second to fourth embodiments.

FIG. 2Q shows a procedure in which the UE decodes each data and feeds back the result of the decoding in a situation where one DL transmission block is divided into the first type data and the second type data.

Specifically, the terminal sequentially decodes the first type data (2q00) and decodes the second type data (2q02). The decoding result for the first type is fed back through the set uplink resource (2q04), and the decoding result for the second type is also fed back through the set uplink resource (2q06).

[Example 2-5]

2R is a diagram illustrating a terminal operation according to the second to fifth embodiments.

FIG. 2r shows a situation in which the UE decodes each data in the situation where one DL data block is divided into the first type data and the second type data, feeds back the result, and the subsequent operation is included.

Specifically, FIG. 2R shows that the terminal first performs decoding (2r00) on the first type data and the second type data. If both the decoding for the first type data and the decoding for the second type data are successful (2r02, 2r04), the terminal reports (2r08) success information of the first type data success and the second type data to the base station . Then, the UE receives (2r16) the next new data through the subsequent downlink resource set. If the decoding for the first type data is successful (2r02) and the decoding for the second type data fails (2r04), the terminal transmits data success to the first type and failure information for the second type data to the base station (2r10). Then, the second type data is re-received (2r18) through the subsequent set downlink resource. If the decoding for the first type data is failed (2r02) and the decoding for the second type data is successful (2r06), the terminal transmits the success for the first type data failure and the second type data to the base station transmission 2r12 )do. Then, the terminal re-receives (2r20) the first type data through the subsequent downlink resources. If both the decoding for the first type data and the decoding for the second type data are failed (2r02, 2r06), the terminal transmits the first type data failure and the second type data failure information to the base station (2r14). Then, the terminal re-receives all the first and second type data through the subsequent downlink resources (2r22).

[Example 2-6]

FIG. 2S is a diagram illustrating a base station operation according to the second to sixth embodiments. FIG.

FIG. 2S shows a situation where the base station adaptively retransmits as it receives each of the feedback on the first type data and the second type data from the terminal. That is, when the base station fails to receive the feedback result for the first type data, it is determined that one transmission block including the first type data and the second type data in the resources allocated in the subsequent downlink, . If the base station does not receive the feedback for the first type data and fails to receive the results for the first and second type feedbacks, the base station transmits the first type data and the second type data in the resources allocated in the subsequent downlink All of one transport block is retransmitted. If the base station successfully receives the feedback for the first and second type data without receiving the feedback for the first type data from the terminal, the base station transmits the next new transmission block in the resource allocated in the subsequent downlink.

Specifically, the base station transmits (2s00) one transport block composed of the first type data and the second type data on the downlink. (2s02) failure for the first type data, or a decoding (2s04) failure for the second type data, the next subsequent operation is to transmit a transport block containing the first type data and the second type data (2s06) again. If both the decoding (2s02) success for the first type data and the decoding (2s04) success for the second type data are all received, the base station transmits the next new data (2s08).

[Example 2-7]

2T is a diagram illustrating base station operation according to the second to seventh embodiments.

2T shows a situation in which the base station receives feedback on the first type data and feedback on the second type data, respectively. The terminal receives feedback on the first type data first, and then receives feedback on the second type data. The base station transmits only the first type data in the allocated downlink resource according to the feedback result on the first type data regardless of the feedback result between them. And transmits only the second type data from the allocated downlink resources according to the feedback result on the second type data. That is, in the initial transmission, one transmission block including the first type data and the second type data is transmitted to the terminal, and the retransmission is an operation in which retransmission is performed according to the corresponding result in different downlink resources.

Specifically, the base station transmits (2t00) one transmission block including the first type data and the second type data. If the base station receives a decoding success (2t02, 2t04) report on the first type data and the second type data of the terminal, the base station determines that transmission of the first type data and the second type data is successful (2t08) . Then, the base station transmits the next new data through the next set downlink resource (2t16). If the base station receives a decoding success (2t02) report for the first type data of the terminal and a decoding failure (2t04) report for the second type data, the base station determines that the data transmission is successful for the first type The second type data transfer is judged as failure (2t10). Then, the second type data is retransmitted (2t18) through the subsequent set downlink resource. If the base station receives a decoding failure (2t02) report for the first type data of the terminal and a decoding success (2t06) report for the second type data, the base station determines that the first type data transmission is a failure The second type data transfer is judged to be successful (2t12). The base station retransmits (2t20) the first type data through the subsequent downlink resource set. If the base station reports failure (2t02, 2t06) for both the first type data of the terminal and the decoding for the second type data, the base station judges that transmission of both the first type data and the second type data is failed (2t14) . Then, the base station retransmits (2t22) both the first type data and the second type data through the subsequent set downlink resource.

2U is a block diagram showing the structure of a UE according to embodiments.

Referring to FIG. 2U, the terminal of the present invention may include a terminal receiving unit 2u00, a terminal transmitting unit 2u04, and a terminal processing unit 2u02. The terminal receiving unit 2u00 and the terminal may collectively be referred to as a transmitting unit 2u04 in the embodiment. The transmitting and receiving unit can transmit and receive signals to and from the base station. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. The transceiving unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 2u02, and transmit the signal output from the terminal processing unit 2u02 through a wireless channel. The terminal processing unit 2u02 can control a series of processes so that the terminal can operate according to the above-described embodiment. For example, the terminal reception unit 2u00 may receive a signal including the second signal transmission timing information from the base station, and the terminal processing unit 2u02 may control to interpret the second signal transmission timing. Thereafter, the terminal transmitting unit 2u04 can transmit the second signal at the above timing.

2V is a block diagram showing the structure of a base station according to the embodiments.

Referring to FIG. 2V, the base station may include at least one of a base station receiving unit 2v01, a base station transmitting unit 2v05, and a base station processing unit 2v03. The base station receiving unit 2v01 and the base station transmitting unit 2v05 may collectively be referred to as a transmitting and receiving unit in the embodiment of the present invention. The transmitting and receiving unit can transmit and receive signals to and from the terminal. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. In addition, the transceiving unit may receive a signal through a wireless channel, output the signal to the base station processing unit 2v03, and transmit the signal output from the terminal processing unit 2v03 through a wireless channel. The base station processing unit 2v03 can control a series of processes so that the base station can operate according to the above-described embodiment of the present invention. For example, the base station processing unit 2v03 may determine the second signal transmission timing and control to generate the second signal transmission timing information to be transmitted to the terminal. Thereafter, the base station transmitting unit 2v05 transmits the timing information to the terminal, and the base station receiving unit 2v01 can receive the second signal at the above timing.

Also, according to an embodiment of the present invention, the base station processor 2v03 may control to generate downlink control information (DCI) including the second signal transmission timing information. In this case, the DCI may indicate the second signal transmission timing information.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible. Further, each of the above embodiments can be combined with each other as needed. For example, the base station and the terminal can be operated by combining the embodiments 2-1, 2-2, and 2-3 of the present invention. Also, although the above embodiments are presented based on the NR system, other systems based on the technical idea of the embodiment may be applicable to other systems such as an FDD or a TDD LTE system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And is not intended to limit the scope of the invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

≪ Third Embodiment >

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

It will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in the present embodiment means a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card. Also, in an embodiment, 'to' may include one or more processors.

For example, 3GPP's High Speed Packet Access (HSPA), LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced To a broadband wireless communication system that provides high-speed, high-quality packet data services such as the LTE-A, 3GPP2 high rate packet data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e communication standards. . In addition, a 5G or NR (new radio) communication standard is being produced with the fifth generation wireless communication system.

In this way, at least one service of Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC), and URLLC (Ultra-Reliable and Low-latency Communications) can be provided to the terminal in a wireless communication system including the fifth generation have. At this time, the services can be provided to the same terminal during the same time period. In the following embodiments of the present invention, eMBB is a high-speed data transmission service, mMTC is a service for minimizing terminal power and connecting multiple terminals, and URLLC is a service aiming at high reliability and low latency. Further, in the following embodiments of the present invention, it is assumed that the URLLC service transmission time is shorter than the eMBB and mMTC service transmission time, but the present invention is not limited thereto. The above three services may be a major scenario in a LTE system or a system such as 5G / NR (new radio, next radio) after LTE.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification. Hereinafter, the base station sets up some or all of the control information of the UE, and performs eNode B, Node B, Base Station (BS), radio access unit, base station controller, Transmission and Reception Point (TRP) And may be at least one of the nodes on the network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions.

In the present invention, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a mobile station, and an uplink (UL) is a wireless transmission path of a signal transmitted from a mobile station to a base station. In the following, embodiments of the present invention will be described as an example of an LTE or LTE-A system, but embodiments of the present invention may be applied to other communication systems having a similar technical background or channel form. For example, 5G mobile communication technology developed after LTE-A (5G, new radio, NR) could be included. In addition, embodiments of the present invention may be applied to other communication systems by a person skilled in the art without departing from the scope of the present invention.

In the LTE system, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is used in a downlink (DL) and a Single Carrier Frequency Division Multiple (SC-FDMA) scheme is used in an uplink Access) method. The uplink refers to a wireless link that transmits data or control signals to a terminal (User Equipment, UE) or a mobile station (MS) to a base station (eNode B or base station (BS) In the above multiple access scheme, time / frequency resources to transmit data or control information for each user are not overlapped with each other, that is, orthogonality So that data or control information of each user can be distinguished.

The LTE system adopts a Hybrid Automatic Repeat reQuest (HARQ) scheme in which a physical layer resends data when a decoding failure occurs in an initial transmission. In the HARQ scheme, if a receiver fails to correctly decode (decode) data, the receiver transmits information indicating a decoding failure (NACK: Negative Acknowledgment) to the transmitter so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with the previously decoded data to improve data reception performance. In addition, when the receiver correctly decodes the data, an acknowledgment (ACK) indicating the decoding success is transmitted to the transmitter so that the transmitter can transmit new data.

FIG. 3A is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in the downlink in an LTE system or a similar system.

Referring to FIG. 3A, the horizontal axis represents time domain and the vertical axis represents frequency domain. The minimum transmission unit in the time domain is an OFDM symbol. N _symb (3a-102) OFDM symbols are gathered to form one slot 3a-106, and two slots are gathered to form one subframe 3a-105. . The length of the slot is 0.5 ms and the length of the subframe is 1.0 ms. The radio frames 3a to 114 are time-domain sections composed of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the total system transmission bandwidth is composed of a total of N _BW (3a -104) subcarriers. However, such specific values can be applied variably.

In a time-frequency domain, a basic unit of a resource can be represented by an OFDM symbol index and a subcarrier index as a resource element (3a-112). A resource block (RB or Physical Resource Block (PRB) 3a-108) includes N _symb (3a-102) consecutive OFDM symbols in the time domain and N _RB (3a-110) . ≪ / RTI > Therefore, one RB (3a-108) in one slot may include N _symb x N _RB REs (3a-112). In general, the minimum frequency-domain allocation unit of data is the RB. In the LTE system, N _symb = 7, N _RB = 12, and N _BW and N _RB may be proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the UE. The LTE system can define and operate six transmission bandwidths. In the case of an FDD system in which the downlink and the uplink are classified by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 3a below shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth can have a transmission bandwidth of 50 RBs.

[Table 3a]

The downlink control information may be transmitted within the first N OFDM symbols in the subframe. In the embodiment, N = {1, 2, 3} in general. Therefore, the N value can be variably applied to each subframe according to the amount of control information to be transmitted in the current subframe. The transmitted control information may include a control channel transmission interval indicator indicating how many OFDM symbols are transmitted through the control information, scheduling information for downlink data or uplink data, and HARQ ACK / NACK information.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from a base station to a mobile station through downlink control information (DCI). The DCI is defined according to various formats, and it is determined according to each format whether the scheduling information (UL grant) for the uplink data or the scheduling information (DL grant) for the downlink data, whether the size of the control information is compact DCI , Whether to apply spatial multiplexing using multiple antennas, whether DCI is used for power control, and so on. For example, DCI format 1, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

- Resource allocation type 0/1 flag: Indicates whether the resource allocation scheme is Type 0 or Type 1. Type 0 allocates resources by resource block group (RBG) by applying bitmap method. In the LTE system, the basic unit of scheduling is an RB represented by time and frequency domain resources, and the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in the type 0 scheme. Type 1 allows a specific RB to be allocated within the RBG.

- Resource block assignment: Indicates the RB allocated to the data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Indicates the modulation scheme used for data transmission and the size of the transport block, which is the data to be transmitted.

- HARQ process number: Indicates the HARQ process number.

- New data indicator: Indicates whether HARQ is initial transmission or retransmission.

- Redundancy version: Indicates the redundancy version of HARQ.

- Transmit Power Control (TPC) command for PUCCH for Physical Uplink Control CHannel: Indicates a transmission power control command for the uplink control channel PUCCH.

The DCI is a physical downlink control channel (PDCCH) (or control information), or an Enhanced PDCCH (Enhanced PDCCH) (or enhanced control information, hereinafter referred to as " It may be used on a mixed basis).

Generally, the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or a mobile station identifier) independently of each mobile station, and a cyclic redundancy check (CRC) is added, channel-coded and then composed of independent PDCCHs . In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal, and can be transmitted over the entire system transmission band.

The downlink data may be transmitted on a physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission. PDSCH may be transmitted after the control channel transmission interval, and scheduling information such as a specific mapping position and a modulation scheme in the frequency domain is determined based on the DCI transmitted through the PDCCH.

Through the MCS among the control information constituting the DCI, the BS notifies the MS of the modulation scheme applied to the PDSCH to be transmitted and the transport block size (TBS) to be transmitted. In an embodiment, the MCS may be composed of 5 bits or more or fewer bits. The TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) to be transmitted by the base station.

The modulation schemes supported by the LTE system are QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and 64QAM, and the respective modulation order (Qm) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation. Also, according to the system modification, a modulation method of 256QAM or more can be used.

3B is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which an uplink data or control channel is transmitted in an LTE-A system.

Referring to FIG. 3B, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an SC-FDMA symbol 1b-202, and N _symb ^UL SC-FDMA symbols can be gathered to constitute one slot 3b-206. Then, two slots form one subframe (3b-205). The minimum transmission unit in the frequency domain is a subcarrier, and the total system transmission bandwidth (1b-204) is composed of a total of N _BW subcarriers. N _BW may have a value proportional to the system transmission band.

The basic unit of resources in the time-frequency domain is a resource element (RE, 3b-212), which can be defined as an SC-FDMA symbol index and a subcarrier index. A resource block pair (RB pair) 3b-208 may be defined as N _symb ^UL consecutive SC-FDMA symbols in the time domain and N _SC ^RB consecutive subcarriers in the frequency domain. Therefore, one RB consists of N _symb ^UL x N _SC ^RB REs. In general, the minimum transmission unit of data or control information is RB unit. In case of PUCCH, it is mapped to a frequency region corresponding to 1 RB and transmitted for 1 sub-frame.

In the LTE system, an uplink physical channel PUCCH or PUSCH, to which HARQ ACK / NACK corresponding to a PDCCH / EPDDCH including a physical channel for downlink data transmission or a semi-persistent scheduling release (SPS release) Can be defined. For example, in an LTE system operating in a frequency division duplex (FDD), a HARQ ACK / NACK corresponding to a PDCCH / EPDCCH including PDSCH or SPS release transmitted in an n-4th subframe is transmitted as a PUCCH or a PUSCH Lt; / RTI >

In the LTE system, the downlink HARQ employs an asynchronous HARQ scheme in which the data retransmission time is not fixed. That is, when HARQ NACK is fed back from the UE to the initial transmission data transmitted from the BS, the BS freely determines the transmission time point of the retransmission data by the scheduling operation. The UE may perform buffering on the data determined to be the result of decoding of the received data for HARQ operation, and then perform combining with the next retransmitted data.

When the UE receives the PDSCH including the downlink data transmitted from the base station in the subframe n, the UE transmits the uplink control information including the HARQ ACK or NACK of the downlink data to the subframe n + k through the PUCCH or PUSCH, Lt; / RTI > Here, k may be defined differently according to FDD or TDD (time division duplex) of the LTE system and its subframe setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number. In addition, the value of k may be differently applied according to the TDD setting of each carrier at the time of data transmission through a plurality of carriers.

Unlike the downlink HARQ in the LTE system, the uplink HARQ adopts a synchronous HARQ scheme in which the data transmission time is fixed. That is, a physical uplink shared channel (PUSCH), a downlink control channel (PDCCH), and a physical hybrid (PHICH) physical channel, in which a downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted, Indicator Channel) can be transmitted and received according to the following rule.

When the UE receives the PDCCH including the uplink scheduling control information transmitted from the base station in the subframe n or the PHICH in which the downlink HARQ ACK / NACK is transmitted, the UE transmits uplink data corresponding to the control information in the subframe n + k PUSCH. Here, k may be defined differently depending on the FDD or TDD (time division duplex) of the LTE system and its setting. For example, in the case of the FDD LTE system, the k can be fixed to 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number. In addition, the value of k may be differently applied according to the TDD setting of each carrier at the time of data transmission through a plurality of carriers.

When the UE receives a PHICH including information related to a downlink HARQ ACK / NACK from a base station in a subframe i, the PHICH corresponds to the PUSCH transmitted by the UE in the subframe i-k. Here, k may be defined differently depending on the FDD or TDD of the LTE system and its setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number. In addition, the value of k may be differently applied according to the TDD setting of each carrier at the time of data transmission through a plurality of carriers.

The description of the wireless communication system is based on the LTE system, and the contents of the present invention are not limited to the LTE system but can be applied to various wireless communication systems such as NR and 5G. Also, in a case where the present invention is applied to another wireless communication system, the k value may be changed and applied to a system using a modulation scheme corresponding to the FDD.

FIG. 3C and FIG. 3D illustrate the allocation of data for eMBB, URLLC, and mMTC, which are services considered in the 5G or NR system, in frequency-time resources.

Referring to FIGS. 3C and 3D, it is possible to see how frequency and time resources are allocated for information transmission in each system.

In FIG. 3C, data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band 1c-300. When the URLLC data 3c-303, 3c-305, 3c-307 are generated while the eMBB 3c-301 and the mMTC 3c-309 are allocated and transmitted in a specific frequency band, 303, 3c-305, 3c-307 can be transmitted without emptying the already allocated portion of the MMTC (3c-301) and mMTC (3c-309) or without transmitting the URLLC data. Among the above services, since the URLLC needs to reduce the delay time, the URLLC data can be allocated (3c-303, 3c-305, 3c-307) to a part of the resource 3c-301 allocated to the eMBB. Of course, when URLLC is further allocated and transmitted in the resource to which the eMBB is allocated, the eMBB data may not be transmitted in the overlapping frequency-time resources, and thus the transmission performance of the eMBB data may be lowered. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.

In FIG. 3D, the entire system frequency band (3d-400) can be divided and used for transmitting services and data in each of the sub-bands 3d-402, 3d-404 and 3d-406. The information related to the subband setting can be predetermined, and the information can be transmitted to the base station through the upper signaling. Alternatively, information related to the subbands may be provided by the base station or the network node without any separate subband configuration information being transmitted to the terminal. In FIG. 3D, subband 3d-402 is used for eMBB data transmission, subband 3d-404 is used for URLLC data transmission, and subband 3d-406 is used for mMTC data transmission.

Although the length of the transmission time interval (TTI) used in the URLLC transmission in the first embodiment will be described below assuming that the length of the TTI is shorter than that used in the eMBB or mMTC transmission, The same applies to the TTI length used. In addition, the response of the information related to the URLLC can be transmitted faster than the response time of the eMBB or mMTC, so that information can be transmitted and received with a low delay.

The eMBB service described below is referred to as a first type service, data for eMBB is referred to as first type data, and control information for eMBB is referred to as first type control information. The first type service, the first type control information, or the first type data may be applicable to at least one of high-speed data transmission or broadband transmission, rather than being limited to the eMBB. The URLLC service is referred to as a second type service, the control information for URLLC is referred to as second type control information, and the data for URLLC is referred to as second type data. The second type service, the second type control information, or the second type data is not limited to the URLLC, and may be at least one of low delay time, high reliability transmission, low delay time, Can be applied to other services or systems that require the above. Further, the mMTC service is referred to as a third type service, the control information for mMTC is referred to as third type control information, and the data for mMTC is referred to as third type data. The third type service third type control information or the third type data is not limited to mMTC but may be applicable to at least one of low speed, wide coverage, low power, intermittent data transmission, small size data transmission, . Further, in describing the embodiment, it can be understood that the first type service includes or does not include the third type service.

The structure of the physical layer channel used according to each service type may be different in order to transmit at least one of the three services, control information, or data. For example, at least one of a length of a transmission time interval (TTI), an allocation unit of frequency or time resources, a structure of a control channel, and a mapping method of data may be different. In this case, although three different services, control information and data have been described above, more types of services, control information and data may exist. In this case, the contents of the present invention may be applied. The embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which: FIG. 1 is a block diagram illustrating a configuration of a service control apparatus according to an exemplary embodiment of the present invention; And the present invention can be applied to be considered as being included.

The terms physical channel and signal in a conventional LTE or LTE-A system may be used to describe the method and apparatus proposed in the embodiment. However, the contents of the present invention can be applied to wireless communication systems other than LTE and LTE-A systems.

As described above, the embodiment defines transmission and reception operations of a first type, a second type, a third type service, and a terminal and a base station for data transmission, and transmits terminals of different types of services, control information, or data scheduling We propose a concrete method to operate together in the same system. In the present invention, the first type, the second type, and the third type terminals indicate the first type, second type, third type service, or data-scheduled terminal, respectively. In an embodiment, the first type terminal, the second type terminal and the third type terminal may be the same terminal or may be different terminals. Also, in the above embodiment, at least one service of the first type, the second type, and the third type service is operated in the same cell or carrier in the terminal supporting at least one service type transmission / reception, The present invention can be applied to the case where the type is operated.

Hereinafter, at least one of an uplink scheduling grant signal and a downlink data signal is referred to as a first signal. Also, in the present invention, at least one of an uplink data signal for the uplink scheduling setting and a response signal (or HARQ ACK / NACK signal) for the downlink data signal is referred to as a second signal. In an exemplary embodiment, a signal transmitted from a base station to a mobile station may be a first signal if it is a signal expecting a response from the mobile station, and a response signal from a mobile station corresponding to the first signal may be a second signal. Also, in the embodiment, the service type of the first signal may be at least one of eMBB, URLLC, and mMTC, and the second signal may also correspond to at least one of the services.

In the following embodiments, the TTI length of the first signal may indicate the length of time during which the first signal is transmitted with a time value related to the first signal transmission. Also, in the present invention, the TTI length of the second signal may indicate the length of time that the second signal is transmitted with the time value associated with the second signal transmission, and the TTI length of the third signal may be related to the third signal transmission The time value may indicate the length of time the third signal is transmitted. In addition, in the present invention, the first signal, the second signal, or the third signal transmission and reception timing is used when the terminal transmits the first signal, the second signal, or the third signal, and the base station transmits the first signal, Or information on when to receive a third signal or when to send a response or feedback (e.g., ACK / NACK information) to the received signal, which may be a first signal, a second signal, Lt; / RTI > At this time, the first signal, the second signal, and the third signal can be regarded as signals for the first type service, the second type service, and the third type service. At this time, at least one or more of the TTI length of the first signal, the second signal, and the third signal and the timing of the first signal, the second signal, and the third signal transmission / reception may be set to be different from each other. For example, the TTI length of the first signal is equal to the TTI length of the second signal, but may be set longer than the TTI length of the third signal. For example, the first signal and the second signal transmission / reception timing may be set to n + 4, but the transmission / reception timing of the third signal may be set to be shorter than the transmission / reception timing, for example, n + 2.

Also, in the following embodiments, when the BS transmits the first signal in the n-th TTI, and the MS transmits the second signal in the n + k-th TTI, the BS informs the MS of the timing to transmit the second signal Is equivalent to telling k value. Alternatively, if the base station transmits the first signal in the n-th TTI and the terminal transmits the second signal in the n + t + a-th TTI, the fact that the base station informs the terminal of the timing to transmit the second signal, Or a value t derived by a previously defined method. Here, the t value may be predefined as various values as well as t = 4 mentioned in the present invention, or may be derived in a predefined manner.

Also, the present invention can be applied not only to FDD and TDD systems but also to a new type of duplex mode (e.g., LTE frame structure type 3).

In the present invention, upper signaling refers to a signal transmission method that is transmitted from a base station to a mobile station using a downlink data channel of a physical layer or from a mobile station to a base station using an uplink data channel of a physical layer, and includes RRC signaling, Signaling, or a MAC control element (MAC control element).

Hereinafter, an embodiment of the present invention describes an uplink transmission resource allocation method for reducing delay between transmission of uplink transmission setup information and establishment of uplink transmission in providing at least one service including eMBB, mMTC, URLLC, do. In the embodiment of the present invention, a base station and a terminal that perform uplink transmission through a license band or a license-exempt band will be described, respectively. However, embodiments of the present invention may be applied without separately discriminating the license band or the license- It will be possible.

In general, a BS schedules a specific transmission time interval (TTI) and a frequency resource region so that the UE can transmit uplink data or control information corresponding to eMBB, mMTC, URLLC, and the like. For example, the base station can set up the subframe n to perform uplink transmission in a subframe n + k (k? 0) to a specific terminal through a downlink control channel. In other words, the base station transmits uplink transmission setup information to a UE requiring uplink transmission through a downlink control channel in a subframe n, and the UE receiving the uplink transmission setup information sets up the uplink transmission setup information The uplink data or control information can be transmitted to the base station (or another terminal) using the time and frequency resource regions. At this time, a terminal having data or control information to be transmitted through the uplink may transmit scheduling request information to the base station, or may request the base station to transmit the uplink transmission setup information to the terminal through a random access procedure.

In other words, uplink transmission of a general terminal can be performed in the following three stages. At this time, uplink transmission through three stages is only one example, and uplink transmission through steps higher or lower than the steps described in this example is also possible.

Step 1: A terminal generating data or control information to be transmitted through an uplink requests an uplink transmission setup to the base station through a valid uplink resource capable of transmitting an uplink transmission setup request. At this time, at least one of a time resource or a frequency resource that can request the uplink transmission setup may be defined in advance or may be set through an upper signal.

Step 2: Upon receiving the uplink transmission setup request from the UE, the Node B sets uplink transmission by transmitting uplink transmission setup information to the UE through the DL control channel.

Step 3: The UE set up for uplink transmission from the base station performs uplink transmission using the uplink transmission setup information set by the base station.

That is, a terminal generating data or control information to be transmitted through the uplink generates a transmission delay longer than a predetermined time for transmitting the uplink information. For example, in a UE having uplink transmission data at a time n, when a UL transmission setup request resource is set to a 5 ms period, a delay of up to 5 ms may occur in transmitting uplink transmission setup request information. In addition, if a transmission delay (for example, 1 ms) between the uplink setting control information reception time and the set uplink transmission start time is required, a transmission delay of at least 6 ms is inevitable in starting the uplink transmission. In a typical LTE system, a transmission delay of at least 4 ms occurs between the uplink setting control information reception time and the set uplink transmission start time. Accordingly, the present invention proposes a method for reducing an uplink transmission delay by allowing a UE to perform an uplink signal transmission operation to perform uplink transmission without receiving additional uplink transmission setup information from a base station.

Accordingly, in the present invention, when a UE desires to perform uplink transmission, it uses a radio resource defined in advance through a broadcast channel, which is defined in advance or includes a higher signal or system information (eg, a system information block A method for performing uplink transmission without setting up a separate uplink transmission from a base station will be described and a method for changing a preset radio resource for the base station to transmit without uplink transmission will be described.

Generally, uplink signal transmission in a mobile station is performed by receiving, from a base station, setting information or scheduling information related to uplink transmission, and then, using a time and frequency resource set through uplink transmission setup information of the terminal, Uplink transmission can be performed.

In the case of a base station and a terminal performing wireless communication in a license-exempt band, that is, after performing a channel access procedure (LBT (listen-before-talk) or channel sensing) In the case of a base station and a terminal capable of transmitting a signal, the terminal configured as an uplink transmission from the base station performs the channel access procedure for the set license-unlicensed band, and only when the unlicensed band is determined to be idle, Uplink transmission can be performed. The operation of the wireless communication in the license-exempt band will be described in more detail as follows.

A base station and a terminal that perform wireless communication in a license-exempted band may be defined in advance according to a frequency band, a country, or the like for coexistence with other wireless devices, or a channel connection A signal may be transmitted or not transmitted according to the result of the channel connection procedure. For example, the base station or the terminal may detect a channel performing the wireless communication during a fixed interval (or time) or a period (or time) varying according to a predefined rule (for example, And a threshold value). If it is determined that the channel is idle for the set time period (for example, when the strength of the received signal received by the base station or the terminal (or the transmitting equipment) during the time is predefined, Value), the BS or the MS can perform the communication using the channel. If it is determined that the channel is not in the idle state for the set time (for example, when the strength of the received signal during the time is defined in advance or is greater than a threshold value set according to the rule) And does not perform communication using the channel. Therefore, if the BS and the UE perform uplink transmission in step 3, the UE performs a channel access procedure for uplink control information and data transmission in steps 1 and 3. In step 2, And performs a channel access procedure for transmission. Therefore, if a terminal performing wireless communication through a license-exempt band can perform uplink transmission without receiving additional uplink transmission setup information from the base station proposed in the present invention, only the channel access procedure in step 3 So that uplink transmission can be performed more efficiently. Hereinafter, it is referred to as grant-free transmission in the present invention that the UE performs the uplink transmission without receiving the uplink transmission setup information from the base station. At this time, the grant-free transmission is not limited to the UE performing the uplink transmission without being set up with respect to the uplink transmission setup information from the base station, as well as at least one or more pieces of setup information related to the uplink transmission (for example, grant-free transmission start frequency information)) can be defined in advance between the base station and the mobile station, or the mobile station can transmit an upper signal from the base station Receiving or setting up system information transmitted through a broadcast channel transmitted from a base station or setting or receiving a terminal through a downlink control channel transmitted from a base station.

A base station or a terminal in a cell operating in a license-exempt band can perform different channel access procedures according to a set uplink transmission scheme from a base station. A base station and a terminal (or a transmitting apparatus) operating in a license-exempt band must perform a channel sensing operation or a channel access procedure for the license-exempt band before transmitting the downlink signal or the uplink signal to the license-exempt band. At this time, the requirements for the channel access procedure may be defined in advance according to a frequency band, a country, or the like, or may be defined in the wireless communication standard.

Generally, a channel access procedure in a transmitting apparatus for transmitting a signal through a license-exempt band measures a strength of a received signal in the band for a preset time according to a rule defined for a license-exempt band to which the signal is to be transmitted, And comparing the intensity of the measured signal with a preset threshold according to a predefined rule to check whether the license-exempted band is usable. If the strength of the received signal is less than the predetermined threshold value, the transmitter determines that the license-exempted band is in an idle state and transmits the signal through the corresponding license-exempted band. If the strength of the signal received during the set time is greater than the preset threshold value, the transmitting device determines that the license-exempted band is occupied by the other devices and does not transmit the signal through the corresponding license-exempted band, The channel connection procedure can be repeated until it is determined that the mobile terminal is in an idle state.

The base station can set up the uplink transmission scheme of the UE through an upper signal or a system information transmission through a broadcast channel, a downlink control channel, or the like. In this case, the uplink transmission scheme of the UE includes a grant-based transmission scheme in which the UE receives uplink transmission setup information from the base station and performs uplink transmission according to the received uplink transmission setup, And a grant-free transmission scheme in which uplink transmission can be performed without receiving link transmission setting information. At this time, it is possible that the UE not only operates as a grant-based transmission scheme or a grant-free transmission scheme, but also supports both a grant-based transmission scheme and a grant-free transmission scheme. For example, when a UE set in a grant-free transmission mode receives uplink transmission setup information from a base station through a downlink control channel, the user equipment receives a grant using the uplink transmission setup information received most recently from the base station -based transmission scheme. At this time, the UE can perform uplink transmission using only a part of uplink transmission setup information most recently received from the base station.

The base station can set the uplink transmission mode in the base station or the cell to the terminal through the upper signal. A method in which a base station sets uplink transmission scheme of a mobile station through an upper signal to a mobile station is as follows. The base station adds a field related to the uplink transmission scheme of the UE to the RRC setup information for a specific base station or cell (or SCell, or transmission and reception point (TRP)), for example, grantfree UL transmission field, the UE can set the uplink transmission scheme for the cell to the grant-free transmission scheme. At this time, the UE receiving the RRC field value of false may determine that the uplink transmission scheme for the cell is set as a grant-based transmission scheme in which the uplink control information is received from the base station and is transmitted. The RRC field and the UL transmission scheme are only examples and are not limited thereto.

The base station can transmit the uplink transmission scheme in the base station or the cell to one or more terminals through system information transmission through a broadcast channel of the base station or the cell. Hereinafter, a method for transmitting or setting uplink transmission mode of a UE through transmission of system information through a broadcast channel to a UE is as follows. The base station or the cell (or the SCell or the transmission and reception point (TRP)) periodically or non-periodically transmits system information (for example, MIB: master information block or SIB: system information block) Or the like. At this time, the broadcast channel means a channel that a plurality of terminals can receive through a predefined identifier (for example, system information RNTI). At this time, the system information may further include at least one of setting information related to a grant-free transmission scheme, for example, time and frequency resource information capable of grant-free transmission, as well as a configuration related to the uplink transmission scheme of the cell can do. If the uplink transmission scheme of the cell is set to the grant-based transmission scheme, the grant-free transmission time, frequency resource information that does not include the frequency resource information, grant-free transmission time, and frequency resource information are included The terminal can ignore it.

The base station can set the uplink transmission scheme of the UE through the downlink control channel of the base station. A method for establishing an uplink transmission scheme of a mobile station through a downlink control channel of a base station is as follows. A base station sets a common control channel among the downlink link control channels of a base station channel or cell-specific search space) or a group common control channel (group common control channel or group-specific search space). Herein, the common control channel or the group common control channel refers to a case where all or a specific group of terminals receive the same control information from a base station through an identifier (e.g., group RNTI) . For example, the base station can set uplink transmission schemes of the UEs included in the group by adding fields related to the uplink transmission scheme of the group among information on uplink transmissions transmitted in the group common control channel . For example, when the field is set to '1', a field for transmitting information related to the uplink transmission scheme, type field or uplink transmission setup information, Can perform the uplink transmission to the BS or the cell in a grant-free transmission scheme. At this time, if the field is set to '0', the UEs receiving the control channel can perform the uplink transmission to the BS or the cell in a grant-based transmission scheme. At this time, the setting method of the added field and field is only one example, and it may be set to a field of 1 bit or more. For example, by adding a 2-bit field, it is possible to set an uplink transmission scheme of a UE by distinguishing a grant-free transmission scheme, a grant-based transmission scheme, a grant-free transmission scheme and a grant-based transmission scheme scheme.

As described above, a UE set as a grant-free transmission scheme in the uplink transmission scheme has at least one of the parameters related to uplink transmission (e.g., time resource region, frequency resource region, MCS, PMI, RI, The terminal can select and transmit the above variables. For example, a base station that has set up a grant-free transmission scheme for a UE as shown in FIG. 3E may use periodic time resource area information capable of grant-free uplink transmission using one of various setting methods described in the above embodiment The UE sets up a frequency resource region in which additional setup is required, for example, a frequency resource region in which actual uplink transmission is performed, in the case of performing uplink transmission in addition to the time-domain information in which the grant- Can be selected and transmitted. At this time, the base station transmits to the mobile station a selectable candidate or set value among the uplink transmission-related parameters that can be selected by the UE, for example, MCS set (QPSK, 16QAM) It is also possible for the UE to select a set value to be used for uplink transmission in the set of candidate groups. At this time, the above-mentioned example of setting the time resource area in advance and arbitrarily selecting the frequency resource is only an example, and all or a part of the variables including the variables other than the variables necessary for the uplink transmission mentioned above may be transmitted to the terminal It is also possible to select.

As described above, the transmission setup information (e.g., time, frequency resource region, MCS, DMRS sequence, DMRS cyclic shift information, grant-free subframe structure or grant-free transmission) The number of symbols used for transmission or the minimum number of symbols) is defined in advance between the base station and the terminal, or the terminal is set or received via the upper signal transmitted from the base station, or the information (E.g., MIB) transmitted through a broadcast channel transmitted from a base station or system information (e.g., SIB) transmitted through a downlink data channel, The grant-free transmission-related setting information is dynamically set (for example, in units of 1 ms or in the order of Units) can not be changed. For example, in a TDD-based system, when there is a UE to which grant-free transmission is established, the BS may dynamically change the uplink and downlink subframes according to the grant- It may be absent. More specifically, for example, if it is assumed that a base station sets a time resource area capable of grant-free transmission to a mobile station over a 10-ms period through an upper signal or SIB, the base station transmits an uplink grant- The subframe set as the resource area can not be used for downlink transmission. As another example, it is assumed that, in a system operating in a license-exempt band, a base station sets up a time resource area capable of grant grant free transmission to the mobile station through an upper signal or SIB according to a channel access procedure of a base station or a mobile station , The grant-free transmission resource can not be efficiently used because the channel access procedure result of the base station and the terminal can not be predicted. Accordingly, the present invention proposes various methods for efficiently varying at least one of the uplink grant-free transmission information set by the base station. When at least one of the various methods disclosed in the present invention is used, the BS can more efficiently use the grant-free transmission resource set for the UE, and control the grant-free transmission in the grant-free transmission resource .

For convenience of description, the minimum unit of downlink and uplink transmission between a base station and a terminal is represented by a slot. In other words, the BS can transmit the downlink control channel to the UE for each slot. For convenience of explanation, setting and changing of time resources among grant-free transmission setting information will be described in the present invention, but it is also possible to set information about grant-free transmission including time resources as well as frequency resources, The method suggested by the present invention can be applied to the change. The inventions proposed in the embodiments 3-1 and 3-2 are not limited to the embodiments, but can be applied to the invention proposed throughout the present invention. In other words, it is also possible to solve the problems to be solved in the present invention by using some or all of the embodiment 3-1 and some or all of the example 3-2.

[Example 3-1]

In this embodiment, a method for informing a subscriber station of grant-free transmission availability or grant-free transmission available slot information in the slot through a downlink control channel is disclosed.

Free transmission from the base station in the slot n, or a specific group among the UEs set to be grant-free transmission enabled or grant-free transmission to all the UEs in the slot n, Information about a slot through which grant-free transmission is possible. More specifically, the base station may transmit the most recent downlink control channel immediately before slot n or slot n (for example, a slot capable of transmitting the most recent downlink control channel just before slot n) A specific group of grant-free transmission from the base station, or a specific group of grant-free transmission enabled UEs, or all of the UEs that are set to grant-free transmission are as follows: To inform the UE about the grant-free transmittable resource. At this time, it is possible to inform the UE about the grant-free transmittable resources by using one of the above four methods as well as one of the above-mentioned methods.

Method 1) A slot (slot n) through which a downlink control channel carrying a common control signal including grant-free transmission availability is transmitted, or

Method 2) includes k1 slots (for example, from slot n to slot n + k1), including slots to which a downlink control channel carrying a common control signal including grant-free transmission availability is transmitted

Method 3) A slot after k2 (for example, slot n + k2) in a slot through which a downlink control channel carrying a common control signal including grant-free transmission availability is transmitted, or

Method 4) In the slot in which the DL control channel carrying the common control signal including grant-free transmission availability is transmitted, slots including k2 and thereafter k1 slots (slot n + k2 to slot n + k2 + k1), a grant-free transmission slot can be informed to the UEs that have received the control information. In this case, k1 is applicable to k1 consecutive slots or k1 non-consecutive slots. In other words, in the case of a continuous slot, the k1 slots mean a setting for the transmission direction of the slot, that is, k1 consecutive slots irrespective of whether k1 slots are downlink transmission slots or uplink transmission slots do. At this time, the UE performs a grant-free transmission to a slot determined as a downlink transmission slot through blind detection on a downlink control channel or a reference signal received from a base station among the slots set as a grant-free transmission capable slot Do not perform. In the case of a discontinuous slot, the UE uses only k1 slots determined as uplink transmission slots among the slots, or the UE selects uplink transmission slots among the slots preset as grant- It is possible to use only k1 slots determined.

In the case where the UE is defined in advance by a base station or a grant-free transmittable resource (or a slot) is set through an upper signal or an SIB, a grant-free transmittable slot Or resource), the UE compares the grant-free transmittable slot received from the base station through the grant-free transmittable slot received through the downlink control channel through a predefined or higher signal or SIB or the like , It is possible to perform a grant-free transmission only for slots commonly applied to the above two settings.

If k1 slots for grant-free transmission operating in the license-exempt band are the slots in which the BS actually performs the downlink transmission, only the slots in which the MS has actually performed the uplink transmission. That is, the slot used for the channel connection procedure may not be included in the k1 slots.

The UE can be configured or received through a common control signal that can be transmitted through the DL control channel through which the BS transmits the grant-free transmittable slot information. At this time, the grant-free transmittable slot information may be transmitted from the base station to the mobile station through at least one of a 1-bit field or a bitmap in the common control signal. 4) using the bit map, the base station can inform the terminal to grant-free transmission availability to slot k1 using the k1 bit or k1 length bitmap for the common control signal. Alternatively, the mobile station can transmit the start slot information for the grant-free transmittable slot and the last slot information for the grant-free transmittable to the mobile station. In this case, at least one of the four methods for informing a grant-free transmittable slot to the UE through the common control signal may be defined in advance between the Node B and the UE, or the Node B may select one of the four methods Signal to the terminal.

[Example 3-2]

In this embodiment, when the Node B does not notify the UE of grant-free transmission availability or grant-free transmittable slot information in the slot on the downlink control channel, the UE determines whether grant- free transmittable slot.

A base station can set a grant-free transmission scheme among a UL transmission scheme to a specific UE, a UE group, or the entire UE through transmission of system information such as an upper signal or an SIB. In this case, the UEs set to grant-free transmission can transmit setting information related to a grant-free transmission (e.g., time or slot information, grant information (RB or subband information) grant- free transmission scheme, a system information such as an upper signal or an SIB for enabling the grant-free transmission scheme, or a system signal such as an upper signal or a separate signal different from the setting information SIB, or the like. At this time, at least one of the setting information related to the grant-free uplink transmission may be set to one or more values, a set, or a candidate group. For example, in the case of MCS, the BS sets a modulation candidate group that the UE can use for grant-free transmission, and the UE selects one of the candidate groups and performs a grant-free transmission. In the case of the MCS, only one piece of configuration information related to a grant-free transmission that can be set as a candidate group. In a case where a set value required for performing grant-free uplink transmission including the MCS is set as a candidate group, .

For example, as shown in FIG. 3E, a base station that sets a grant-free transmission scheme to a UE sets periodic time-domain resource information or slot information that can grant-free uplink transmission to the UE, free uplink transmission is required in a time domain in which free transmission is possible, a variable that is required to be set in the grant-free uplink transmission in addition to the set time information, for example, , MCS, and the like, and the grant-free transmission can be performed. At this time, the UE can set not only a periodic time resource area capable of grant-free uplink transmission but also an aperiodic time resource area. In addition, frequency-domain information that can grant-free transmission can be changed according to a time resource region that can be fixed or the same or grant-free uplink transmission in a time resource region where grant-free uplink transmission is possible. At this time, the start point of the frequency domain in which grant-free transmission is possible may be fixed or the same in the time resource area in which grant-free uplink transmission is possible. In other words, the grant-free transmission frequency range may vary depending on the grant-free transmission time range, but the starting point of the grant-free transmission frequency range may be set to be the same.

However, in a system in which downlink and uplink transmission can be dynamically changed in a slot, a plurality of slots, or a subframe unit (hereinafter referred to as a dynamic TDD system) or a system operating in a license-exempt band, Area can be used by the base station for downlink information transmission. In particular, the base station transmits at least a grant-free transmission region to transmit downlink control information such as a synchronization signal, a system information, a reference signal, Some of them can be used for downlink control information transmission or downlink data information transmission. Therefore, if a base station performs downlink signal transmission in a predetermined region or slot as a grant-free transmission region and a grant-free uplink transmission is performed, the UE performs downlink and uplink signal transmission and reception Not all can be done correctly.

Since the transmission of the downlink control information of the base station is generally more important than the grant-free uplink transmission of the terminal, the downlink and uplink transmission in the license-exempt band from the terminal or the base station, The UE having been set to be able to determine whether grant-free transmission is possible for the slot before grant-free transmission.

A method for determining grant-free transmission in slot n in the UE is as follows.

Method 1: When slot structure information for slot n is received from a base station, it is judged whether grant-free transmission is possible according to received slot structure information

Method 2: If there is information to be transmitted to the downlink control signal transmission time or slot from the base station, it is determined whether grant-free transmission is possible according to the downlink control signal transmission time information

Method 3: Determine whether grant-free transmission is possible after performing a channel access procedure in a slot set as an uplink transmission slot or in all slots without discrimination between a downlink and uplink transmission slot

The method 1 will be described in more detail as follows. The BS may transmit common control information to one or more UEs or a group of UEs or all the UEs through a downlink control channel in a slot n. If the common control information includes transmission structure (number of downlink transmission symbols, number of uplink transmission symbols, number of symbols for guard interval, or uplink number of uplink transmission symbols) for slot n or slot n + 1 or slots n and n + Or information on the transmission direction (downlink, uplink, or empty subframe), etc., of the number of symbols to which the control signal is transmitted, Free transmission in slot n according to the received information.

A concrete example is as follows. If the UE received the configuration information of the slot n transmitted through the common control information, if the slot n is set as the uplink transmission slot or the uplink data transmission in the slot n set through the common control information If the number of valid symbols is equal to or greater than the number of grant-free transmission symbols set by the grant-free transmission setting information, or the number of symbols for which uplink data transmission in slot n is valid, If the determined threshold is equal to or greater than the predetermined threshold value, the UE can perform grant-free transmission. If the slot n is set as a downlink transmission slot, or the number of symbols for which uplink data transmission is valid in the slot n set through the common control information, the number of grant-free transmission symbols Free transmission if the number of symbols for which uplink data transmission in slot n is valid is smaller than a predetermined threshold preset by grant-free transmission setting information.

The method 2 will be described in more detail as follows. The base station transmits information on a slot through which a downlink control signal (e.g., at least one of a synchronization signal, a system information (MIB and / or SIB), a reference signal, and a discovery signal) The MIB and / or SIB may be set to the UE or the slot or time at which the control signal is transmitted may be defined in advance between the Node B and the UE. At this time, not only the time at which the downlink control signal is transmitted but also the frequency position may be defined in advance or may be set to the UE through an upper signal. For example, the synchronization signal in the current LTE FDD system is predefined to be transmitted in 6 RBs in the center of the system bandwidth in the 6th and 7th symbols of subframes 0 and 5. Also, the detection signal in the current LTE FDD system can transmit one synchronization signal (PSS / SSS) and five reference signals (CRS port 0) in, for example, a maximum of 5 consecutive subframes at a period of 40 ms. At this time, the terminal is set via the upper signal from the base station in relation to the discovery signal transmission period, the discovery signal transmission interval, and the like.

Therefore, if the UE determines a grant in the slot n by comparing the time and frequency domain, which are predefined as described above, or the downlink control signal set by the base station, -free It is possible to judge whether or not transmission is possible. For example, if at least one of the time, the frequency domain, and the grant-free transmittable area is set in advance, or the time when the downlink control signal set by the base station is transmitted, Free transmission in both the set time and frequency domain, or grant-free transmission using the remaining region except for the overlapping region as described above. For example, in a case where a sync signal is predefined to be transmitted in a slot n, and a grant-free transmission is enabled in a slot n-1, a slot n, a slot n + 1, and a slot n + 2, Free transmission in both the slot n-1, the slot n, the slot n + 1, and the slot n + 2 or the slot n-1 and the slot n + 1 except for the slot n in which the downlink synchronization signal is transmitted, , And in the slot n + 2, grant-free transmission can be performed. Another example of the method 2 is to increase the uplink slots in the slot after the slot in which the downlink control signal of the base station is actually transmitted among the slots n-1, n, n + 1, and n + Link grant-free transmission can be performed. The method may be valid for a system operating in a license-exempt band. That is, in the case of the license-exempt band, the actual transmission time of the downlink control channel of the base station may vary according to the result of the channel connection procedure. In other words, the base station may transmit the control information in slot n-1 or slot n + 1 instead of slot n. In this case, since the control information transmission of the BS is relatively more important than the grant-free transmission of the UE, if the DL control signal transmission region and the grant-free transmission region overlap with each other as described above, Free transmission after the slot in which the downlink control signal of the base station is transmitted.

The method 3 will be described in more detail as follows. In this case, the method 3 is applicable to both systems operating in the licensed band and the license-exempt band, and the channel access procedure in the system operating in the licensed band includes a channel access method performed for channel connection in the license- can be different. For example, in the channel access procedure in the license band, the received signal threshold value for determining whether or not the channel can be connected may be set different from the value of the license-exempt band. In addition, the channel access method may be performed to detect a reference signal of a base station or a terminal. At this time, the terminal can receive the setting related to the channel access operation from the base station in the grant-free transmission setting information.

In the method 3, the UE must perform a channel access operation before grant-free transmission. For this, the DL signal transmission start time or symbol, the grant-based UL signal transmission start time, or the grant-free UL signal transmission start time or symbol position in the slot n may be set differently. For example, the downlink signal and the grant-based uplink signal transmission in slot n may be set to start at symbol index 0, and the grant-free uplink signal transmission may be set to start at symbol index 1. [ At this time, a UE desiring to transmit a grant-free uplink signal may perform a channel access operation prior to grant-free transmission, and may or may not perform grant-free transmission according to a channel sensing result. For example, in the channel sensing operation, when a received signal strength of a predetermined reference or more is measured, the UE determines that the slot is used for grant-based uplink transmission of the downlink of the BS or another UE, . ≪ / RTI > At this time, setting information of at least one channel access procedure among a channel access procedure for downlink signal transmission, a channel access procedure for grant-based uplink signal transmission, and a channel access procedure for grant free free signal transmission is different It is possible to distinguish the DL signal transmission, the grant-based UL signal transmission, and the grant-free UL signal transmission as described above.

At this time, a point of time or a symbol position for performing a channel access operation for determining grant-free transmission may be defined in advance between a base station and a mobile station, or a base station may transmit or set the setting related to the channel access operation to the mobile station. At this time, it is also possible for the UE to receive a grant-free uplink transmission start time or symbol from a base station in a grant-free transmission slot. For example, a grant-free transmission in slot n may be set to start at the kth (e.g., symbol index # 1) symbol of slot n. At this time, the terminal can perform the channel access procedure before the k symbols. At this time, the location of the grant-free transmission start symbol may be defined in advance or included in the grant-free transmission setting information, and may be set through an upper signal or SIB. At this time, the position of the grant-free transmission start symbol may be included in the common control signal transmitted through the downlink control channel of the base station. If the downlink signal transmission and the grant-based uplink transmission start time are defined in advance as symbols of k-m1 and k-m2 (m1 > 0, m2 > 0, m1 and m2 may be the same or different) Free transmission in the slot n, the UE sets the grant-free transmission in the slot-n in the grant-free transmittable area before the grant-free transmission start time (for example, k-1 symbol) And performs or does not perform grant-free transmission according to a channel sensing operation result.

A method of setting a grant-free uplink signal transmission resource of a base station according to the present invention will be described with reference to FIG. In step 3f-601, the BS transmits an uplink transmission method (e.g., grant-based) used for uplink transmission of the BS or the cell through at least one of an upper signal, a broadcast channel, An uplink or grant-free uplink transmission method, or a grant-based and grant-free uplink transmission method). In step 3f-602, additional parameters necessary for the uplink transmission may be set according to the uplink transmission method set in step 3f-601. For example, in a grant-free uplink transmission method, a base station transmits setting information for at least one resource region among a time resource region and a frequency resource region in which the grant-free uplink transmission can be performed, , A broadcast channel, or a downlink control channel. At this time, the step 3f-602 is included in 3f-601 and can be set or transmitted to the terminal. In step 3f-602, not only the time and frequency resource areas but also MCS information, cyclic shift, TTI length, DMRS-related information for grant-free transmission, -free transmission start symbol, setting information related to a channel access procedure for grant-free transmission, a candidate value that the terminal can select for the variable values, and the like. have. In this case, if the uplink transmission setup is an uplink transmission setup for a license-unlicensed band, the base station may change the parameters related to the uplink channel connection procedure in step 3f-602 according to the uplink transmission method set in step 3f-601 Can be set. If it is determined in step 3f-603 that a downlink control signal or a downlink data signal transmission is required in the grant-free transmission resource region set in the base station, or that grant-based uplink transmission is necessary, In step 605, it is possible to set the corresponding slot not to be used as grant-free through the common control information transmitted through the downlink control channel, or to reset the grant-free transmittable resource.

A method of establishing a channel access procedure according to an uplink signal transmission method of a terminal according to the present invention will be described with reference to FIG. In step 3g-701, the UE transmits an uplink transmission method (e.g., grant-based) used for uplink transmission to the base station or the cell through at least one of an upper signal, a broadcast channel, An uplink or grant-free uplink transmission method, or a grant-based and grant-free uplink transmission method). In step 3g-702, the UE can further set a variable value required for uplink transmission according to the uplink transmission method set in step 3g-701 from the base station. For example, a UE having a grant-free uplink transmission method sets up configuration information for at least one resource region among a time resource region and a frequency resource region in which the grant-free uplink transmission can be performed, , A broadcast channel, or a downlink control channel. At this time, the step 3g-702 is included in 3g-701 and can be set up from the base station. In step 3g-702, in step 3g-702, the UE not only uses the time and frequency resource areas but also performs MCS, cyclic shift, TTI length, and DMRS for grant-free transmission that the UE can use for grant- Free transmission start symbol in a slot, a channel access procedure-related setting information for a grant-free transmission, or a candidate value that the terminal can select for the variable values, You can get the whole setting. In this case, the uplink transmission method set in step 3g-701 or the frame structure type of the uplink transmission band or the uplink transmission band is performed in step 3g-702 according to at least one frame structure type At least one variable among the variables related to the UL channel access procedure may be set differently. If the uplink transmission scheme established by the base station in step 3g-701 determined in step 3g-703 is a grant-based scheme, the UE transmits the uplink transmission scheme in step 3g-704, except for the uplink transmission scheme established in step 3g- And transmits the uplink transmission method in which at least one variable value among the variable values received in step 3f-602 is set as a new variable value, In step 3g-703, the UE can determine whether grant-free transmission is possible in the slot n according to the uplink transmission scheme received from the base station. If it is determined in step 3g-703 that grant-free transmission is possible in slot n, the UE can perform uplink transmission using the grant-free uplink transmission setup previously set through step 3g-704. At this time, some of the parameters required for uplink transmission can be selected by the UE. If it is determined in step 3g-703 that grant-free transmission is not possible in slot n, for example, if slot n is used for downlink signaling or grant-based uplink signaling, If it can not be terminated, the UE may not perform grant-free uplink signaling. If the UE receives the uplink transmission setup in slot n through the downlink control channel of the base station before slot n or slot n in step 3g-705, that is, In step 3g-707, the UE with the link transmission setup can perform uplink transmission according to the uplink UL transmission setup newly received from the downlink control channel of the BS.

In order to perform the above embodiments, the terminal and the base station may include a transmitter, a receiver, and a processor, respectively. In the above embodiment, a transmitting and receiving method of a base station and a terminal is shown in order to determine a transmission and reception timing of a second signal and to perform an operation according to the transmission and reception timing of the second signal. The transmitting unit, the receiving unit and the processing unit can perform the above operation. In the embodiment, the transmission unit and the reception unit may be referred to as a transmission / reception unit capable of performing all of their functions, and the processing unit may be referred to as a control unit.

3H is a block diagram showing the structure of a terminal according to an embodiment.

Referring to FIG. 3H, the terminal of the present invention may include a terminal receiving unit 3h-800, a terminal transmitting unit 3h-804, and a terminal processing unit 3h-802. The terminal receiving unit 3h-800 and the terminal may be collectively referred to as a transmitting unit 3h-804, which may be referred to as a transmitting / receiving unit in the embodiment. The transmitting and receiving unit can transmit and receive signals to and from the base station. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. The terminal processing unit 3h-802 compares the strength of the received signal with a preset threshold value to measure the strength of the signal received through the channel connection (3h-802) And may transmit the signal output from the terminal processing unit 3h-802 through the wireless channel according to the channel connection operation result. The transceiving unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 3h-802, and transmit the signal output from the terminal processing unit 3h-802 through a wireless channel. The terminal processor 3h-802 can control a series of processes so that the terminal can operate according to the above-described embodiment. For example, the terminal reception unit 3h-800 may receive a signal including the second signal transmission timing information from the base station, and the terminal processing unit 3h-802 may control to interpret the second signal transmission timing. Thereafter, the terminal transmitter 3h-804 can transmit the second signal at the above timing.

3I is a block diagram showing the structure of a base station according to an embodiment.

3i, the base station may include at least one of a base station receiving unit 3i-901, a base station transmitting unit 3i-905, and a base station processing unit 3i-903. The base station receiving unit 3i-901 and the base station transmitting unit 3i-905 are collectively referred to as a transmitting and receiving unit in the embodiment of the present invention. The transmitting and receiving unit can transmit and receive signals to and from the terminal. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. In addition, the transceiver unit may receive a signal through a wireless channel, output the signal to the base station processing unit 3i-903, and transmit the signal output from the terminal processing unit 3i-903 through a wireless channel. The base station processing unit 3i-903 can control a series of processes so that the base station can operate according to the above-described embodiment of the present invention. For example, the base station processing unit 3i-903 may determine the second signal transmission timing and control to generate the second signal transmission timing information to be transmitted to the terminal. Thereafter, the base station transmitting unit 3i-905 transmits the timing information to the terminal, and the base station receiving unit 3i-901 can receive the second signal at the timing. For example, the base station processing unit 3i-903 may set at least one of a grant-free or grant-based transmission scheme of the UE as an uplink transmission scheme, The base station transmitter 3i-905 can transmit configuration information related to uplink transmission including the defined uplink channel connection procedure to the UE.

Also, according to an embodiment of the present invention, the base station processing unit 3i-903 can control to generate downlink control information (DCI) including the second signal transmission timing information. In this case, the DCI may indicate the second signal transmission timing information.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible. In addition, each of the above embodiments can be combined and operated as needed. For example, some of the embodiments of the present invention may be combined with each other so that the base station and the terminal can be operated. Although the above embodiments are presented on the basis of the NR system, other systems based on the technical idea of the embodiment may be applicable to other systems such as an FDD or a TDD LTE system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And is not intended to limit the scope of the invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

<Fourth Embodiment>

For example, 3GPP's High Speed Packet Access (HSPA), LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced To a broadband wireless communication system that provides high-speed, high-quality packet data services such as the LTE-A, 3GPP2 high rate packet data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e communication standards. . In addition, a 5G or NR (new radio) communication standard is being produced with the fifth generation wireless communication system.

In the LTE system, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is used in a downlink (DL) and a Single Carrier Frequency Division Multiple (SC-FDMA) scheme is used in an uplink Access) method. The uplink refers to a radio link through which a UE (User Equipment) or an MS (Mobile Station) transmits data or control signals to a base station (eNode B or base station (BS) The term &quot; wireless link &quot; In the above multiple access scheme, the data or control information of each user is classified and operated so that the time and frequency resources for transmitting data or control information for each user do not overlap each other, that is, orthogonality is established. do.

The LTE system adopts a Hybrid Automatic Repeat reQuest (HARQ) scheme in which a physical layer resends data when a decoding failure occurs in an initial transmission. In the HARQ scheme, if a receiver fails to correctly decode (decode) data, the receiver transmits information indicating a decoding failure (NACK: Negative Acknowledgment) to the transmitter so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with the previously decoded data to improve data reception performance. In addition, when the receiver correctly decodes the data, an acknowledgment (ACK) indicating the decoding success is transmitted to the transmitter so that the transmitter can transmit new data.

In a wireless communication network including a plurality of cells, a transmission / reception point (TRP), or a beam, coordination between each cell, TRP, or beam is an element that can greatly affect the transmission efficiency of the entire network. In order to cooperate with each cell, TRP, or beam, the UE must be able to perform channel estimation and interference estimation through the plurality of cells, TRP, or beam. On the other hand, major scenarios considered in LTE 5G / NR (next radio, next radio) system such as indoor hotspot are aimed at high density and high density network in many cases. Therefore, the number of cells, TRPs, or beams that can be cooperated for one UE increases with respect to LTE, which leads to an increase in complexity required for channel and interference estimation.

In the present invention, the CSI framework for network coordination is summarized. First, DL CSI-RS, UL CSI-RS (SRS), and DMRS setup and transmission methods for efficient channel estimation are provided. The base station can enable the terminal to measure various channel conditions through a plurality of TRPs or beams. In addition, the present invention discusses an interference measurement method and a channel state generation method capable of coping with various interference situations. The base station can instruct the UE to generate a CSI for network coordination based on the channel and interference estimation and report it to the base station. Finally, we provide a QCL signaling method to support various cooperative node geometries and dynamic transmission scheme changes.

More particularly, the present invention provides downlink (DL) channel state information reference (CSI-RS), uplink (UL) CSI-RS, or SRS sounding reference signal, and DMRS (demodulation reference signal). The UE generates channel state information (CSI) for each network coordination scenario based on the estimated channel and interference information, and reports the CSI to the BS. At this time, the base station transmits the quasi co-location (QCL) information provided by the present invention to the UE in order to provide a criterion for time / frequency offset correction of RSs that are locally transmitted in time / frequency resources such as aperiodic RS or sub- And it is possible to appropriately improve the channel estimation performance through each RS through the terminal.

4A is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in the downlink in the LTE system.

In FIG. 4A, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb (102) OFDM symbols constitute one slot 106, and two slots form one subframe 105. The length of the slot is 0.5 ms and the length of the subframe is 1.0 ms. The radio frame 114 is a time domain including 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the total system transmission bandwidth is composed of a total of N _BW (104) subcarriers.

In a time-frequency domain, a basic unit of a resource can be represented by an OFDM symbol index and a subcarrier index as a resource element (RE) 112. A resource block (RB or Physical Resource Block) 108 is defined as N _symb (102) consecutive OFDM symbols in the time domain and N _RB (110) consecutive subcarriers in the frequency domain. Thus, one RB 108 is comprised of N _symb x N _RB REs 112. In general, the minimum transmission unit of data is the RB unit. In the LTE system, N _symb = 7, N _RB = 12, and N _BW and N _RB are generally proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the UE. The LTE system defines and operates six transmission bandwidths. In the case of an FDD system in which the downlink and the uplink are classified by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 4a shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth has a transmission bandwidth of 50 RBs.

[Table 4a]

In the case of downlink control information, it is transmitted within the first N OFDM symbols in the subframe. In general, N = {1, 2, 3}. Therefore, the N value varies with each subframe according to the amount of control information to be transmitted in the current subframe. The control information includes a control channel transmission interval indicator indicating how many OFDM symbols control information is transmitted, scheduling information for downlink data or uplink data, and an HARQ ACK / NACK signal.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from a base station to a mobile station through downlink control information (DCI). The DCI defines various formats and determines whether scheduling information (DL grant) for uplink data or scheduling information (DL grant) for downlink data, a compact DCI having a small size of control information, Whether to apply spatial multiplexing, DCI for power control, and the like. For example, DCI format 1, which is scheduling control information (DL grant) for downlink data, is configured to include at least the following control information.

- Resource allocation type 0/1 flag: Notifies whether the resource allocation method is Type 0 or Type 1. Type 0 allocates resources by resource block group (RBG) by applying bitmap method. In the LTE system, the basic unit of scheduling is an RB represented by time and frequency domain resources, and the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in the type 0 scheme. Type 1 allows a specific RB to be allocated within the RBG.

- Resource block assignment: Notifies the RB allocated to data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Notifies the modulation scheme used for data transmission and the size of the transport block, which is the data to be transmitted.

- HARQ process number: Notifies the HARQ process number.

- New data indicator: Notifies HARQ initial transmission or retransmission.

- Redundancy version: Notifies redundancy version of HARQ.

- Transmit power control command for PUCCH (Physical Uplink Control CHannel): Notifies a transmission power control command for PUCCH, which is an uplink control channel.

The DCI is a physical downlink control channel (PDCCH) (or control information), or an Enhanced PDCCH (Enhanced PDCCH) (or enhanced control information, hereinafter referred to as &quot; It should be used in combination).

Generally, the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or a UE ID) independently for each UE, and is cyclically redundant check (CRC) added and channel-coded. do. In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal and spread over the entire system transmission band.

The downlink data is transmitted through a Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH is transmitted after the control channel transmission interval. The scheduling information such as the specific mapping position in the frequency domain, the modulation scheme, and the like is notified by the DCI transmitted through the PDCCH.

The base station notifies the UE of a modulation scheme applied to a PDSCH to be transmitted and a transport block size (TBS) to be transmitted through an MCS having 5 bits among the control information constituting the DCI. The TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) to be transmitted by the base station.

The modulation schemes supported by the LTE system are QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and 64QAM, and the respective modulation order (Qm) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.

4B is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which data or a control channel is transmitted in an uplink in an LTE-A system according to the related art.

Referring to FIG. 4B, the horizontal axis represents time domain and the vertical axis represents frequency domain. The minimum transmission unit in the time domain is an SC-FDMA symbol 202, and N _symb ^UL SC-FDMA symbols form one slot 206. Then, two slots form one subframe 205. The minimum transmission unit in the frequency domain is a subcarrier, and the total system transmission bandwidth 204 is composed of a total of N _BW subcarriers. N _BW has a value proportional to the system transmission band.

The basic unit of resources in the time-frequency domain is a resource element (RE) 212, which can be defined as an SC-FDMA symbol index and a subcarrier index. A resource block pair (RB pair) 208 is defined as N _symb ^UL consecutive SC-FDMA symbols in the time domain and N _SC ^RB consecutive subcarriers in the frequency domain. Therefore, one RB consists of N _symb ^UL x N _SC ^RB REs. In general, the minimum transmission unit of data or control information is RB unit. In case of PUCCH, it is mapped to a frequency region corresponding to 1 RB and transmitted for 1 sub-frame.

In the LTE system, an uplink physical channel PUCCH or PUSCH, to which HARQ ACK / NACK corresponding to a PDCCH / EPDDCH including a physical channel for downlink data transmission or a semi-persistent scheduling release (SPS release) Is defined. For example, in an LTE system operating in a frequency division duplex (FDD), a HARQ ACK / NACK corresponding to a PDCCH / EPDCCH including PDSCH or SPS release transmitted in an n-4th subframe is transmitted as a PUCCH or a PUSCH .

In the LTE system, the downlink HARQ employs an asynchronous HARQ scheme in which the data retransmission time is not fixed. That is, when HARQ NACK is fed back from the UE to the initial transmission data transmitted from the BS, the BS freely determines the transmission time point of the retransmission data by the scheduling operation. The UE buffers data determined to be an error as a result of decoding the received data for HARQ operation, and then performs the combining with the next retransmission data.

When the UE receives the PDSCH including the downlink data transmitted from the base station in the subframe n, the UE transmits the uplink control information including the HARQ ACK or NACK of the downlink data to the subframe n + k through the PUCCH or PUSCH, Lt; / RTI &gt; In this case, k is defined differently according to the FDD or TDD (time division duplex) of the LTE system and its subframe setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number.

Unlike the downlink HARQ in the LTE system, the uplink HARQ adopts a synchronous HARQ scheme in which the data transmission time is fixed. That is, a physical uplink shared channel (PUSCH), a downlink control channel (PDCCH), and a physical hybrid (PHICH) physical channel, in which a downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted, Indicator Channel) is fixed by the following rule.

When the UE receives the PDCCH including the uplink scheduling control information transmitted from the base station in the subframe n or the PHICH in which the downlink HARQ ACK / NACK is transmitted, the UE transmits uplink data corresponding to the control information in the subframe n + k PUSCH. Here, k is defined differently according to FDD or TDD (time division duplex) of the LTE system and its setting. For example, in the case of the FDD LTE system, the k is fixed at 4. Meanwhile, in the TDD LTE system, k may be changed according to the subframe setting and the subframe number.

When the UE receives the PHICH carrying the downlink HARQ ACK / NACK from the base station in the subframe i, the PHICH corresponds to the PUSCH transmitted by the UE in the subframe i-k. Here, k is defined differently depending on the FDD or TDD of the LTE system and its setting. For example, in the case of the FDD LTE system, the k is fixed at 4. On the other hand, in case of the TDD LTE system, k may be changed according to the subframe setting and the subframe number.

The description of the wireless communication system is based on the LTE system, and the contents of the present invention are not limited to the LTE system but can be applied to various wireless communication systems such as NR and 5G. For example, subcarrier number per PRB of the one in the NR may be able to be defined as other than _{N RB = 12 N RB = 16} . In LTE, the uplink waveform is limited to SC-FDMA as shown in FIG. 4B, but it is not limited to NR, and OFDMA or OFDMA and SC-FDMA can be selectively applied to the uplink as shown in FIG. 4A. Therefore, even if the following description of the present invention is based on one set value, it is for convenience of explanation and it is obvious that the present invention is not limited thereto.

In a mobile communication system, time, frequency, and power resources are limited. Therefore, if more resources are allocated to the reference signal, the resources that can be allocated to the transmission of the traffic channel (data traffic channel) are reduced, and the absolute amount of data to be transmitted can be reduced. In this case, although the performance of channel measurement and estimation may be improved, the absolute amount of data to be transmitted is reduced, so that the overall system capacity performance may be lowered.

Therefore, a proper allocation between the resources for the reference signal and the resources for the traffic channel transmission is required so as to derive the optimum performance in terms of the total system capacity.

4C is a diagram illustrating radio resources of one subframe and one resource block (RB), which are the minimum units that can be downlink-scheduled in the LTE / LTE-A system.

The radio resource shown in FIG. 4C is composed of one subframe on the time axis and one resource block (RB) on the frequency axis. Such radio resources are composed of 12 subcarriers in the frequency domain and 14 OFDM symbols in the time domain, thereby providing a total of 168 natural frequencies and time positions. In LTE / LTE-A, the respective natural frequencies and time positions in FIG. 4C are referred to as resource elements (REs).

In the radio resource shown in FIG. 4C, a plurality of different types of signals may be transmitted as follows.

1. CRS (Cell Specific RS): A reference signal transmitted periodically for all UEs belonging to one cell and can be commonly used by a plurality of UEs.

2. Demodulation Reference Signal (DMRS): This is a reference signal transmitted for a specific terminal and is transmitted only when data is transmitted to the terminal. The DMRS can be composed of a total of 8 DMRS ports. In LTE / LTE-A, port 7 to port 14 correspond to the DMRS port, and each port maintains orthogonality so as not to interfere with each other using CDM or FDM.

3. PDSCH (Physical Downlink Shared Channel): A data channel transmitted in the downlink, which is used for the BS to transmit traffic to the UE and is transmitted using the RE in which the reference signal is not transmitted in the data region of FIG. 4C.

4. Channel Status Information Reference Signal (CSI-RS): A reference signal transmitted for terminals belonging to one cell, and is used to measure the channel status. A plurality of CSI-RSs can be transmitted to one cell.

5. Other control channels (PHICH, PCFICH, and PDCCH): These are used to provide control information necessary for the UE to receive the PDSCH or to transmit ACK / NACK for HARQ operation for uplink data transmission.

In the LTE-A system other than the above-mentioned signal, muting can be set so that the CSI-RS transmitted from another base station can be received without interference to the terminals of the corresponding cell. The muting can be applied at a position where the CSI-RS can be transmitted. Generally, the UE receives the traffic signal by skipping the corresponding radio resource. In LTE-A systems, muting is also referred to as zero power CSI-RS (zero-power CSI-RS). Because of the nature of the muting, muting is equally applied to the location of the CSI-RS and no transmit power is transmitted.

In FIG. 4C, the CSI-RS can be transmitted using a part of the positions indicated by A, B, C, D, E, E, F, G, H, I, J according to the number of antennas transmitting CSI- have. The muting can also be applied to a portion of the locations denoted by A, B, C, D, E, E, F, G, H, I, In particular, the CSI-RS can be transmitted in 2, 4, or 8 REs depending on the number of antenna ports to transmit. If the number of antenna ports is two, the CSI-RS is transmitted in half of the specific pattern in FIG. 4B. If the number of antenna ports is four, the CSI-RS is transmitted to all the specific patterns. CSI-RS is transmitted. On the other hand, muting is always done in one pattern unit. That is, although muting can be applied to a plurality of patterns, it can not be applied to only a part of one pattern when the position does not overlap with the CSI-RS. However, it can be applied only to a part of one pattern only when the position of CSI-RS overlaps with the position of muting.

When CSI-RS is transmitted for two antenna ports, signals of each antenna port are transmitted in two REs connected in the time axis, and signals of each antenna port are divided into orthogonal codes. In addition, when CSI-RS is transmitted for four antenna ports, signals for the remaining two antenna ports are transmitted in the same manner by using two additional REs in addition to CSI-RS for two antenna ports. The same is true when the CSI-RS for eight antenna ports is transmitted.

The base station may boost the transmission power of the CSI-RS to improve channel estimation accuracy. Four or eight antenna ports (AP) When a CSI-RS is transmitted, a particular CSI-RS port is transmitted only in the CSI-RS RE at the specified location and not in other OFDM symbols within the same OFDM symbol. 4D is a diagram illustrating an example of CSI-RS RE mapping for the n-th and n + 1-th PRBs when the base station transmits 8 CSI-RSs. As shown in FIG. 4D, when the CSI-RS RE position for the 15th or 16th AP is the same as the check pattern shown in FIG. 4d, the CSI-RS RE for the remaining 17th to 22th APs indicated by the hatched pattern has 15 or 16 The transmit power of the AP is not used. Therefore, as shown in FIG. 4D, the 15th or 16th AP can use the transmit power to be used for the 3rd, 8th and 9th subcarriers in the 2nd subcarrier. This natural power boosting enables the power of the 15th CSI-RS port transmitted through the second subcarrier to be set up to 6dB higher than the transmission power of the 15th AP used in the data RE. The current 2/4/8 port CSI-RS patterns are capable of natural power boosting of 0/2/6 dB respectively, and each AP uses full power available through it to transmit CSI-RS It is possible to do.

In addition, the UE can be allocated CSI-IM (or IMR) with the CSI-RS. The CSI-IM resource has the same resource structure and location as the CSI-RS supporting the 4-port. CSI-IM is a resource for a terminal that receives data from one or more base stations to accurately measure interference from an adjacent base station. For example, if the adjacent base station wants to measure the amount of interference when transmitting data and the amount of interference when not transmitting, the base station constructs CSI-RS and two CSI-IM resources, and one CSI- The CSI-IM can always transmit a signal and the adjacent base station does not always transmit a signal, so that the interference amount of the adjacent base station can be effectively measured.

In the LTE-A system, the base station can notify the terminal of CSI-RS configuration information (CSI-RS configuration) through upper layer signaling. The CSI-RS configuration includes an index of CSI-RS configuration information, a number of ports included in the CSI-RS, a transmission period of the CSI-RS, a transmission offset, CSI-RS resource configuration information, Scrambling ID, QCL information, and the like.

In a cellular system, a base station must transmit a reference signal to a mobile station in order to measure a downlink channel condition. In the LTE-A (Long Term Evolution Advanced) system of the 3GPP, the UE measures the channel state between the BS and the BS using the CRS or the CSI-RS, do. The channel state basically needs to consider several factors, including the amount of interference in the downlink. The amount of interference in the downlink includes an interference signal generated by an antenna belonging to an adjacent base station, thermal noise, and the like, and it is important for the terminal to determine the channel condition of the downlink. For example, when transmitting a signal from a base station with one transmit antenna to a terminal with a receive antenna, the terminal calculates energy per symbol that can be received in the downlink using the reference signal received from the base station, It is necessary to determine the interference amount to be received at the same time and determine Es / Io. The determined Es / Io is converted into a data transmission rate or a value corresponding thereto, and is notified to the base station in the form of a channel quality indicator (CQI), thereby enabling the base station to transmit to the terminal at a certain data transmission rate in the downlink To be able to judge whether or not.

In the case of the LTE-A system, the UE feeds back information on the channel status of the downlink to the base station so that it can be utilized for downlink scheduling of the base station. That is, the UE measures a reference signal transmitted from the base station in the downlink, and feeds back the extracted information to the base station in a form defined by the LTE / LTE-A standard. There are three main types of information that the UE feedbacks in LTE / LTE-A.

Rank Indicator (RI): The number of spatial layers that the UE can receive in the current channel state.

Precoder Matrix Indicator (PMI): An indication of the precoding matrix preferred by the terminal in the current channel state

Channel Quality Indicator (CQI): The maximum data rate that the terminal can receive in the current channel state. The CQI can be replaced by a SINR that can be used similar to the maximum data rate, a maximum error correction coding rate and modulation scheme, and data efficiency per frequency.

The RI, PMI, and CQI are related to each other and have a meaning. For example, the precoding matrix supported by LTE / LTE-A is defined differently for each rank. Therefore, PMI values when RI has a value of 1 and PMI values when RI has a value of 2 are interpreted differently even if their values are the same. Also, when the UE determines the CQI, it is assumed that the rank value and the PMI value, which the BS has notified to the BS, are applied to the BS. That is, when the UE reports RI_X, PMI_Y, and CQI_Z to the base station, it means that the UE can receive the data rate corresponding to CQI_Z when rank is RI_X and precoding is PMI_Y. In this way, when calculating the CQI, the UE assumes a transmission scheme to be performed by the base station, so that the UE can obtain optimized performance when performing the actual transmission according to the transmission scheme.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification. Hereinafter, the base station may be at least one of an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. In the present invention, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a mobile station, and an uplink (UL) is a wireless transmission path of a signal transmitted from a mobile station to a base station. In the following, embodiments of the present invention will be described as an example of an LTE or LTE-A system, but embodiments of the present invention may be applied to other communication systems having a similar technical background or channel form. For example, 5G mobile communication technology developed after LTE-A (5G, new radio, NR) could be included. In addition, embodiments of the present invention may be applied to other communication systems by a person skilled in the art without departing from the scope of the present invention.

The contents of the present invention are applicable to FDD and TDD systems.

In the present invention, upper signaling is a signal transmission method that is transmitted from a base station to a mobile station using a downlink data channel of a physical layer or from a mobile station to a base station using an uplink data channel of a physical layer, and includes RRC signaling or PDCP signaling , Or a MAC control element (MAC CE).

As described above, in order to perform network coordination such as signal transmission or interference management through multi-cell, TRP, or beam, at least the following three functions must be satisfied.

The first function is channel estimation for multiple cells, TRPs, or beams (or combinations thereof). Unlike LTE CSI-RS which is always wideband-transmitted according to given period and time offset, CSI-RS in NR can be transmitted non-periodically and in subband considering various factors such as forward compatibility.

Hereinafter, specific examples for performing one or a combination of the above methods will be described.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these embodiments, and one or more embodiments may be applied simultaneously or in combination.

[Example 4-1 Example: RS RE mapping method]

The embodiment 4-1 provides concrete examples of the RS RE mapping method. 4E is a diagram showing an RE structure in the PRB when one PRB is configured with 16 subcarriers (vertical axis) and 14 OFDM (or SC-FDMA) symbols (horizontal axis). In this case, one OFDM symbol consists of 8 RS RE subgroups. Here, RS RE subgroup is the minimum unit of RS configuration composed of two adjacent REs in the same OFDM symbol, and it can be defined by various names such as component RS RE pattern and component RS resource. In the present invention, for convenience of description, eight RS RE subgroups existing in the Xth OFDM symbol are denoted as {AX, BX, ...}. , HX}. For example, there are eight RS RE subgroups from A0 (501) to H0 (502) in the 0th OFDM symbol. In this case, an orthogonal cover code (OCC) of length 2 is applied to each RS RE subgroup. ([1 1] or [1 -1]) Thus, it is possible for a maximum of two ports, for example port a and port a + 1, to be multiplexed into one RS RS subgroup.

In this example, the base station signals the information such as the symbol index (or the resource configuration index), the time and frequency domain aggregation level, the comb index, or the frequency domain measurement restriction information associated with the RS transmission It is possible.

First, the BS informs the MS of a location on the time axis through which the RS is transmitted through the symbol index (or resource configuration index) X to which the RS is transmitted.

RS resource, which is the unit through which the actual RS is transmitted, is composed of a combination of the RS RE subgroups. In one RS resource, one RS antenna port is spread by OCC having the same length as the number of RE included in RS resource. This is to provide various RS patterns according to the situation to facilitate the interference management between RSs. For this purpose, the BS can announce 'aggregation level' through higher layer signaling or L1 signaling to the MS. The aggregation level may be composed of a time domain aggregation level indicating the extension in the time axis and a frequency domain aggregation level indicating the extension in the frequency axis. (The aggregation level can be defined in various terms such as replication level, number of sub time units within a CSI-RS resource, etc.)

As shown in FIG. 4E, when 16 subcarriers are included in one PRB, the frequency domain aggregation level is determined to be one of {1, 2, 4, or 8}. (When one PRB is composed of 12 subcarriers, the aggregation level value is less than 8.) The UE knows how many RS RE subgroups are bundled into one RS resource according to the set aggregation level. For example, if the aggregation level is 1, each RS RE subgroup is interpreted as a separate RS resource. On the other hand, if the aggregation level is 2, two adjacent RS RE subgroups are bundled together to form one RS resource. In FIG. 4E, AX and BX are bound to define the first RS resource, and {CX, DX}, {EX, FX}, and {GX, HX} . As another example, when the aggregation level is 8, 8 RS RE subgroups from AX to HX are bundled together to form one RS resource. Such a variable RS resource structure facilitates interference environment control by various factors such as UL-DL interference by dynamic TDD, interference by multiple numerology (for example, different subcarrier spacing, etc.).

On the other hand, when frequency domain aggregation is used only, there is a risk that the channel estimation performance may deteriorate in terminals where RS power is important due to coverage problems such as noise limited environment. To solve this problem, it is possible to transmit RS over one or more OFDM symbols using time domain aggregation. For example, if time domain aggregation is possible up to two symbols, the time domain aggregation level is determined to be one of {1 or 2}. If time domain aggregation is possible up to four symbols, the time domain aggregation level is determined to be one of {1, 2, or 4}.

It should be noted that when the aggregation level is greater than 1, the OCC can also be expanded together in performing the aggregation. For example, suppose that A4 and B4 are combined to produce R0 as in Example 1 (503) of FIG. 4e. OCC-2 ([1 1] or [1 -1]) of A4 and OCC-2 ([1 1] or [1 -1]) of B4 are transmitted to OCC-4 . When RS ports a to a + 3 are transmitted to the four REs of R0 = [A4 B4], the first two ports combine the OCCs of A4 and B4 without OCC code conversion for the latter half (B4). That is, OCC-4 of RS ports a and a + 1 becomes [1 1 1 1] and [1 -1 1 -1]. While the last two ports combine the OCCs of A4 and B4 after the OCC code conversion for the back half (B4). That is, the OCC-4 of RS ports a + 2 and a + 3 becomes [1 1 -1 -1] and [1 -1 -1 1]. Even when time domain aggregation is applied as in Example 2 (504) of FIG. 4E, the above-described OCC extension method can be similarly applied. 504 In the above example, the same OCC extension can be performed by replacing A4 and B4 with A7 and A8.

The OCC extension method can be generalized to a higher level aggregation level using a recursive function structure. Specifically, the OCC at the aggregation level N is expanded based on the OCC at the aggregation level N / 2. The RS resource of the aggregation level N consists of two aggregation level N / 2 RS resources and a maximum of 2N RSs can be multiplexed. That is, assuming that 'a' is the minimum RS port index that can be transmitted in the RS resource of the aggregation level N, RS port a to RS port a + 2N-1 are transmitted in the corresponding RS resource. The RS ports that can be transmitted in the RS resource of the aggregation level N are {a, a + 1, ... , a + N-1} and {a + N, a + N + 1, ... , a + 2N-1}. In the case of the ports belonging to the first group, the OCC-N patterns of two aggregation level N / 2 RS resources constituting the aggregation level N RS resource are aggregated without code conversion and extended to the OCC-2N pattern of the aggregation level N RS resource . On the other hand, in the case of the ports belonging to the second group, after the sign of the second OCC-N pattern among the OCC-N patterns of the two aggregation level N / 2 RS resources constituting the aggregation level N RS resource -N pattern multiplied by -1) to extend the OCC-2N pattern of the aggregation level N RS resource. The basic unit of the recursive function is the RS RE subgroup described above.

The frequency domain and the time domain aggregation level are illustrated as independent set values for convenience of explanation, but may be defined as one value in actual application.

When the time domain aggregation and the frequency domain aggregation are simultaneously applied, frequency domain aggregation is performed prior to time domain aggregation. This is to enable one symbol based RS pattern and overlapping of RS patterns extended over time domain, that is, transmission over two or more symbols. If the frequency domain aggregation is performed first, the pattern can be maintained in one OFDM symbol regardless of whether time domain aggregation is applied or not, so that it is possible to perform the above function.

The base station can adjust the RS RE density by setting the comb type transmission or measurement restriction (MR) in the frequency domain. For example, if a base station sets a comb type transmission or measurement restriction based on a repetition factor (RPF) 2, the terminal divides the RS resource, the final decision value of the RS RE subgroup or aggregation shown in FIG. 4E, into two different groups, Only the group can measure RS. It is possible to construct two groups with equal intervals such as {AX, CX, EX, GX} and {BX, DX, FX, HX} when dividing by RS RE subgroup. In this case, it has the advantage of having the same RS RE transmission position regardless of the aggregation level. On the other hand, if the RS resource is divided by the aggregation, it can be composed of {AX, BX, EX, FX} and {CX, DX, GX, HX} like 503. In this case, the OCC pattern can be precisely matched according to the aggregation level and the RPF setting, thereby facilitating RS interference management.

In FIG. 4E, reference symbols 503 and 504 show examples of RS resource setting results according to the RS transmission OFDM symbol, aggregation level, and comb type or frequency domain MR setting. In particular, reference numeral 503 denotes an OFDM symbol having a frequency of 4, a frequency domain aggregation level of 2, a time domain aggregation level of 1, and an RPF = 2. , And RPF = 2 are set. In the present embodiment, a procedure for setting RS resources such as 503 or 504 has been described. In practice, however, the result of the method may be stored in a storage medium, such as 503 or 504, to be referred to.

It should be noted that the aggregation level and comb type or frequency domain MR settings can be promised to change according to time (or RS transmission location). For example, when a plurality of RS resources are set in two or more OFDM symbols in one PRB, different aggregation levels and comb type or frequency domain MR setting values may be applied according to an OFDM symbol. For example, when RS is transmitted in OFDM symbol # 1 and # 8 OFDM symbol, a low value of RPF is applied to OFDM symbol # 1 and a high value of RPF is applied in OFDM symbol # 8 It can be promised to have RS RE density. This is to secure excellent channel estimation performance at the beginning of transmission without the previously acquired channel estimation information and to reduce the RS transmission burden in the middle or late transmission period in which the channel estimation information is available. In the above example, the RS RE density in the PRB may be different. However, the present invention is not limited to this, and it is obvious that the RS RE density can be extended between different subframes or TTIs. Changes in the aggregation level and comb type or frequency domain MR settings may be made explicitly through upper signaling or L1 signaling, or may be implicitly defined in the specification. If it is explicitly changed through signaling, the base station can inform the UE whether the aggregation level and comb type or frequency domain MR settings are changed over time. That is, the base station can selectively apply the RS RE density change over time (only when necessary, but using the same RS RE density).

The base station can set to the terminal what RS is transmitted to the RS resource configured as shown in the above example. For example, the BS may announce to the MS through the upper layer signaling that the RS resource configured by the above example is one of CSI-RS, SRS, or DMRS.

Although the above example has been described based on non-zero-power (NZP) CSI-RS, NZP SRS, and NZP DMRS, i.e., RS resource, the resource setting method does not necessarily have to be limited to the NZP RS setting. The above method can be equally applied to resource setting for zero-power (ZP) CSI-RS, ZP SRS, and ZP DMRS for PDSCH rate matching.

As described above, up to 2N RS ports can be multiplexed through OCC in an aggregation level N RS resource. If the RS resource has 2N RS ports {a, a + 1, ... , a + 2N-1} is transmitted, the value of the port index a does not need to be the same in all PRBs of all bands. This is to support different TRPs for transmitting RS ports by subband or for different beams.

According to this example, the UE can recognize the RS resource and receive the RS according to at least one of the configuration of the RS transmission OFDM symbol, the aggregation level, and the comb type or the frequency domain MR. If some of the set values are known to the UE through upper layer signaling or L1 signaling, a problem may arise in that the UEs not receiving the related signaling can not find the correct RS resource location. In order to minimize such a problem, it is possible to provide an initial value for the set values and, if there is no related signaling, to estimate the RS resource position by assuming the initial value. For example, if the UE does not receive the signaling information related to the frequency domain aggregation level, it is possible to promise to assume the highest aggregation level (8 in FIG. 4E). This is to achieve the average effect even if the aggregation level does not match exactly according to the signaling.

In this example, we describe how to set the RS resource as the basic unit of the RS RE subgroup consisting of two adjacent REs (two adjacent subcarriers) on the frequency axis. However, it is clear that the extension method can also be applied based on other basic patterns. For example, it is possible for some of the above-described methods to be applied when there is a minimum RS pattern of a fixed type and additional expansion based thereon.

For example, an RS RE subgroup consisting of two adjacent REs (two adjacent OFDM symbols) on the time axis, or an RS RE subgroup consisting of two REs present in two adjacent subcarriers and two adjacent OFDM symbols, or two The RS RE subgroup consisting of eight adjacent subcarriers and eight REs existing in four adjacent OFDM symbols, and the like. At this time, the RS RE subgroup may coincide with the CDM group. For example, if RS RE subgroups consisting of two REs are used, CDM-2 is applied to each RS RE subgroup. If RS RE subgroups consisting of four REs are used, CDM-4 is applied to each RS RE subgroup, It is possible to apply CDM-8 to each RS RE subgroup when using an RS RE subgroup consisting of eight REs.

[Example 4-2 Example: Interference measurement configuration]

In this embodiment, an interference measurement method for network coordination will be described.

In the NR (5G) CSI framework, it is necessary to introduce a flexible interference measurement method in order to cope with various radio transmission environments such as variable TTI and multiple numerology. If the TTI is long or the subcarrier spacing (SCS) is small, the change unit in the time axis becomes long, so that the time unit of the system resource allocation (RA) unit or precoding change becomes longer. On the other hand, if the TTI is short or the subcarrier spacing is large, the time unit of the RA unit of the system or the precoding change time becomes short because the unit of change in the time axis is shortened. On the other hand, since TTI or subcarrier spacing can be set according to the channel condition of each UE, it can be inferred that various interference can be changed in various time units within one cell. This means that, unlike LTE, which operates with a single TTI and (in most cases) a single subcarrier spacing, the variation of interference in NR can be very large. DL-UL interference or UL-DL interference due to dynamic TDD is another factor that can amplify the interference fluctuation.

It is important that the IM (interference measurement) method in NR has two functions in consideration of these characteristics:

In NR, IM should be designed in consideration of the smallest time or frequency granularity of possible interferences. That is, if a time unit for data / control transmission of a terminal is long (TTI is long or SCS is small), if the time unit for the variation of interference is short, IM having a short time unit for estimating it is needed.

In order to perform accurate interference measurement in various interference situations, it is required to support both 1) signal-based interference extraction technique and 2) puncturing-based interference (power) measurement technique.

4F is a diagram showing an example of occurrence of interference when the TTI of the serving TRP is different from the TTI of the interference TRP. Referring to FIG. 4F, if the TTI of the desired channel is long but the TTI of the interference is short, it is implied that the SINR variation may be several times within one TTI. If it is assumed that only one of the three IM resources 602, 603, and 604 is used in one TTI 601 in which data is transmitted, then 602 and 604 can only measure interference when the interfering TRP of FIG. In the case of 603, since only the interference when the interfering TRP of FIG. 4F is transmitted is measured, it will be difficult to measure the interference effect on 601. FIG. To solve these problems, the following two methods can be considered.

The first is to allow the terminal to use a sufficient number of IM resources for statistical measurement of interference. As an example of this method, a base station can set measurement restrictions of different values for channel estimation and interference estimation. For example, a short measurement window is used considering the CSI-RS beam change in the channel estimation, but a long measurement window can be used for the statistic acquisition in the interference estimation. Another example of this method is to set the IM resource to a smaller unit interval than the RS resource (eg RS resource is set per subframe but IM resource is in slot or mini slot (eg 2 or 4 OFDM symbol) Set). Referring to FIG. 4F, one RS resource is set in 601, and one IM resource is set in 602, 603, and 604, respectively, in accordance with the time unit of interference.

The second method is to provide IM resources with high resolution for accurate and immediate interference measurements. This can be understood similar to the second example of the first method. That is, it is possible to set the IM resource in a unit interval smaller than RS resource (for example, RS resource is set per subframe but IM resource is set in slot or mini slot (eg 2 or 4 OFDM symbol) The RS resource is set to 601, but the IM resource is set to 602, 603, and 604, respectively, in accordance with the time unit of the interference.

For the interference measurement as described above, 1) signal-based interference extraction technique and 2) puncturing-based interference (power) measurement technique may be considered. The signal-based interference extraction technique measures one of the predetermined signals such as CSI-RS or DMRS and considers it as interference. At this time, the base station transmits a signal for actually measuring the interference, and the signal can be used for various purposes such as generating a new interference hypothesis by combining the measured interference signals as well as the interference signals measured in the corresponding signals after estimation in the terminal -RS based IM or DMRS based IM, DMRS based CQI, etc.). On the other hand, in the case of puncturing based interference measurement, the serving TRP may not transmit the actual signal to the decoding resource after setting the IM resource. At this time, the UE can measure the power of the actual interference in the punctured collision resources and reflect the CSI generation. According to the embodiment 4-1, the DL CSI-RS / UL CSI-RS / DMRS setting can be supported by a single framework, and the feedback setting or the feedback contents can be changed according to the IM use described above.

[Example 4-3: QCL signaling]

In this embodiment, a quasi co-location (QCL) setting method according to various network coordination environments is provided. Figure 4g illustrates an example of a network coordination scenario. According to FIG. 4g, one cell (gNB) may have multiple TRPs. At this time, each TRP can be distinguished by CSI-RS resource (or CSI-RS port). For example, the UE can receive four CSI-RS resources A, B, C, and D as shown in FIG. 4G. Suppose that RS resource A, B is transmitted in TRP 1, and RS resources C and D are transmitted in TRP 2. At this time, the UE can report its preferred subset of the entire RS resource set to the base station via the CSI-RS resource indicator (CRI), and receive and transmit data based on the beam direction applied to the corresponding resources. In this case, if the UE selects resources A and C transmitted from different TRPs, QCL properties such as delay shift, delay spread, Doppler shift, Doppler spread, and AoD spread may not be the same for CSI-Rs transmitted from the corresponding resources . In addition, unlike in LTE-A, CSI-RS can also be subband transmitted in NR, which may require QCL support with other RSs for time or frequency offset compensation. In other words, in NR, QCL support for various RSs such as sub-band CSI-RS as well as DMRS needs to be considered and a flexible QCL setting is required considering various transmission scenarios.

4H is an illustration of QCL signaling that may be considered in single point transmission. Referring to FIG. 4H, when the CSI-RS is transmitted using one beam because the angular spread of the channel is small, the CSI-RS and the DMRS for data transmission can share all the QCL properties. On the other hand, if the channel's angular spread is large and there is more than one dominant path, it is possible to perform channel estimation using more than two CSI-RS beams and to share QCL properties between all CSI-RS port groups and DMRS port groups It may not be possible. (E.g., AoD (angle of departure), etc.), the specific QCL properties that can not be shared should be set to be shared only between some CSI-RS port groups and DMRS port groups. (For example, AoD information is shared only between the CSI-RS and the DMRS corresponding to the upper path in the multi-beam drawing of FIG. 4h and between the CSI-RS and the DMRS corresponding to the lower path)

4I is an illustration of QCL signaling that may be considered in multi-point transmission. In FIG. 4I, only a single beam (when the angular spread is small) is shown for convenience of explanation, and a multi-beam case can be extended with reference to the description of FIG. 4H. Referring to FIG. 4I, it is possible for one DMRS and CSI-RS port to be transmitted in a plurality of TRPs in the same frequency / time resource for a coherent JT (joint transmission) transmission technique. It can be understood that RS ports are shared between TRPs. In this case, the DMRS can share the QCL properties with the CSI-RS. As another example, it is possible for a plurality of CSI-RS and DMRS ports to be transmitted through independent TRPs in independent frequency / time resources for non-coherent JT and other transmission schemes. In this case, unlike the above example, RSs transmitted through the same TRP or the same beam can share the QCL property, but they should not share the QCL propoerty when they are transmitted through different TRPs or different beams.

Therefore, it is necessary to consider all of the environments shown in FIG. 4G, FIG. 4H, and FIG. 4I in compensating time / frequency offset for the RS that is locally transmitted on the time / frequency axis. For this purpose, the base station can set QCL master set and QCL slave set through upper layer signaling. The QCL master set comprises IDs of RSs capable of extracting the QCL property, that is, a sufficiently wide band and having a sufficiently short time duration between RS REs. For example, if there are four such RSs, the base station can define a QCL master set as follows.

_{QCL MASTER _SET = {RS ID #} 1, RS ID # 2, RS ID # 3, RS ID # 4}

The QCL slave set includes IDs of RSs that perform time / frequency offset compensation based on the QCL property extracted from the master set, that is, RSs that are transmitted in a narrow band or have a long time duration between RS REs. If there are three such RSs, the base station can define the QCL slave set as follows.

QCL _{SLAVE _SET} = {RS ID # 5, RS ID # 6, RS ID # 7}

In the above example, RS ID #N is an ID indicating at least one DL CSI-RS, UL CSI-RS (SRS), DMRS, and the like.

Based on the QCL master set and the slave set, the base station can set at least one QCL subgroup and announce it to the UE through upper layer signaling. Each QCL subgroup consists of a master and a slave configuration component. The mater component and the slave component in the QCL subgroup are indicators for specifying the QCL property master relationship between the QCL master set and the QCL slave set. Suppose that the Nth QCL subgroup is set as follows.

QCL _{SUBGROUP #N} = {

SUBGROUP _MASTER = {A, A, A, B}

SUBGROUP _SLAVE = {A, B, NAN}

}

The UE receives the QCL _{SUBGROUP #N} and recognizes that the RSs indicated by the RS IDs # 1, # 2 and # 3 and the RSs indicated by the RS ID # 5 are included in the same QCL subgroup A. Therefore, the terminal can correct the time / frequency offset of the RS indicated by the RS ID # 5 through the QCL property estimated by the RS indicated by the RS IDs # 1, # 2, and # 3. Similarly, the UE receives the QCL _{SUBGROUP #N} and recognizes that the RSs indicated by the RS ID # 4 and the RSs indicated by the RS ID # 6 are included in the same QCL subgroup B. Therefore, the terminal can correct the time / frequency offset of the RS indicated by the RS ID # 6 through the QCL property estimated by the RS indicated by the RS ID # 4. On the other hand, RS ID # 7 is not included in any QCL subgroup since the SUBGROUP _SLAVE value is NAN. Thus, the RS pointed to by RS ID # 7 becomes an independent RS in terms of QCL.

The base station transmits the QCL _SUBGROUP It is possible to notify the terminal through the L1 signaling how many of the settings to use. For example, if there are network coordination scenarios that require four different QCL settings, the base station sets up four QCL subgroups (QCL _{SUBGROUP # 1} , QCL _{SUBGROUP # 2} , QCL _{SUBGROUP # 3} , and QCL _{SUBGROUP # 4} ). The UE can then receive the two-bit L1 signaling and determine whether to adjust the time / frequency offset according to which of the QCL _{SUBGROUP # 1} , QCL _{SUBGROUP # 2} , QCL _{SUBGROUP # 3} and QCL _{SUBGROUP # 4} .

The execution sequence of the above-described embodiment 4-3 is summarized as shown in FIG. 4J.

[Example 4-4: OFDM symbol location for CSI-RS transmission]

The embodiments 4-1, 4-2, or 4-3 may be applied based on a CSI-RS transmitted by OFDM symbols at various positions within a slot including a CSI-RS. The slot including the CSI-RS includes CSI-RS timing information (e.g., CSI-RS subframe / slot including periodicity and offset information) set by an upper layer in case of periodic CSI-RS or semi-persistent CSI- configuration. In the case of an Aperiodic CSI-RS, the slot containing the CSI-RS may be a slot a certain distance from the DCI triggering the aperiodic CSI-RS transmission. In this embodiment, various examples of OFDM symbol positions for CSI-RS transmission in a slot including the CSI-RS are provided.

4k is a diagram illustrating examples of OFDM symbols for NR CSI-RS transmission to avoid OFDM symbols for NRDMRS and NR PDCCH transmission and OFDM symbols for LTE CRS transmission.

In the first example of FIG. 4k, 14 OFDM symbols are used to avoid resources (4k-00) for PDCCH transmission, resources (4k-01a) for DMRS transmission and resources (4k-02) for LTE CRS transmission (NZP) or zero-power (ZP) CSI-RS in the 6th, 7th, 13th and 14th OFDM symbols (4k-03) in one slot. If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4k-03 can be set in accordance with Embodiments 4-1 and 4-2. In this example, the resource 4k-01a for DMRS transmission is assumed to be transmitted in 3, 4, 9, and 10th OFDM symbols, to provide accurate DMRS channel estimation for high layer MIMO transmission or high-speed terminals. In case of transmitting CSI-RS in 4k-03, the CSI-RS pattern between the slot consisting of 14 symbols and the mini slot consisting of 7 symbols is matched, so that the CSI-RS reception structure of the terminal is simplified and the rate matching becomes easy . However, when three or more OFDM symbols are used for transmission of more than 24 CSI-RS ports, since one CSI-RS is transmitted over six or more OFDM symbol transmission periods, the accuracy of channel estimation due to phase drift may deteriorate There is a disadvantage.

In the second example of FIG. 4k, 14 OFDM symbols are used to avoid resources (4k-00) for PDCCH transmission, resources (4k-01b) for DMRS transmission, and resources (4k-02) for LTE CRS transmission NZP or ZP CSI-RS can be transmitted / set in 10, 11, 13, and 14th OFDM symbols (4k-04) in one slot. If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4k-04 can be set in accordance with Embodiments 4-1 and 4-2. In this example, it is assumed that resources 4k-01b for DMRS transmission are transmitted in 3, 4, and 9th OFDM symbols, which provides accurate DMRS channel estimation for high-layer MIMO transmission or high- It is for this reason. RSs in the CSI-4k-4k-04 can be transmitted within a short time even if a large number of CSI-RS ports are transmitted within one CSI-RS resource, It is possible to perform rate matching for most NR CSI-RS resources. However, since CSI-RS resources are located in the latter half of the slot, there is a disadvantage in fast CSI feedback.

In the third example of FIG. 4k, 14 OFDM symbols are used to avoid resources (4k-00) for PDCCH transmission, resources (4k-01b) for DMRS transmission and resources (4k-02) for transmitting LTE CRS NZP or ZP CSI-RS can be transmitted / set in 6, 7, 10, 11, 13, and 14th OFDM symbols (4k-05) in one slot. If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, a detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4k-05 can be set in accordance with Embodiments 4-1 and 4-2. In this example, it is assumed that resources 4k-01b for DMRS transmission are transmitted in 3, 4, and 9th OFDM symbols, which provides accurate DMRS channel estimation for high-layer MIMO transmission or high- It is for this reason. It is possible to support CSI-RS resources in various cases from 4k-05 to 4k-03 or 4k-04, and it is possible to take advantage of 4k-03 or 4k-04 according to circumstances. However, the increase in the number increases the complexity of the UE and the base station.

In the fourth example of FIG. 4k, 14 OFDM symbols are used to avoid resources (4k-00) for PDCCH transmission, resources (4k-01c) for DMRS transmission and resources (4k-02) for transmitting LTE CRS NZP or ZP CSI-RS can be transmitted / set in 4, 6, 7, 10, 11, 13, and 14th OFDM symbols (4k-06) in one slot. If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, a detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4k-06 can be set in accordance with Embodiments 4-1 and 4-2. In this example, it is assumed that the resources 4k-01c for the DMRS transmission are transmitted in the 3rd and 9th OFDM symbols, in order to minimize the RS overhead. The advantages and disadvantages of 4k-06 are similar to the above-mentioned third example (4k-05). The choice for 4k-05 or 4k-06 may be explicitly indicated by higher signaling or L1 signaling, but it is possible to implicitly determine from the base station's DMRS pattern setting. This implicitly indicates that if the BS instructs the UE to use different DMRS patterns such as 4k-01b or 4k-01c, the available CSI-RS resources can be varied accordingly.

In the fifth example of FIG. 4k, 14 OFDM symbols are used to avoid resources (4k-00) for PDCCH transmission, resources (4k-01b) for DMRS transmission, and resources (4k-02) for transmitting LTE CRS NZP or ZP CSI-RS can be transmitted / set in 6, 7, 10, and 11th OFDM symbols (4k-07) in one slot. If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4k-07 can be set in accordance with Embodiments 4-1 and 4-2. In this example, it is assumed that resources 4k-01b for DMRS transmission are transmitted in 3, 4, and 9th OFDM symbols, which provides accurate DMRS channel estimation for high-layer MIMO transmission or high- It is for this reason. When transmitting CSI-RS in 4k-07, the number of OFDM symbols required for transmission of CSI-RS resource including more than 24 CSI-RS ports is less than 6 and is between 4k-03 and 4k-04. It is possible to perform rate matching on the NR CSI-RS resources of the UE. However, since NZP or ZP CSI-RS can not be set in the 13th and 14th OFDM symbols, it may be difficult to avoid the LTE PSS / SSS / PBCH, and the downlink PDSCH decoding may be adversely affected have.

In the sixth example of FIG. 4k, in order to avoid the resources (4k-00) for the PDCCH transmission and the resources (4k-01a) for the DMRS transmission, in a slot composed of 14 OFDM symbols, 5, 6, 7, NZP or ZP CSI-RS can be transmitted / set in symbols (4k-08). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4k-08 can be set in accordance with Embodiment 4-1 and Embodiment 4-2. In this example, the resource 4k-01a for DMRS transmission is assumed to be transmitted in 3, 4, 9, and 10th OFDM symbols, to provide accurate DMRS channel estimation for high layer MIMO transmission or high-speed terminals. In case of transmitting CSI-RS in 4k-08, since one CSI-RS resource can be transmitted by continuous OFDM symbols irrespective of the number of CSI-RS ports to be transmitted, . However, in this case, there is a disadvantage that it is difficult to avoid collision with the OFDM symbol in which the LTE CRS (4k-02) is transmitted.

FIG. 41 is a diagram illustrating further examples of OFDM symbols for NR CSI-RS transmission to avoid OFDM symbols for NRDMRS and NR PDCCH transmission and OFDM symbols for LTE CRS transmission. However, in the examples of FIG. 4L, it is possible that OFDM symbols for some DMRS transmissions are shared for CSI-RS transmission.

In order to avoid resources (4l-00) for PDCCH transmission and resources (4l-02) for transmitting LTE CRS in the first example of FIG. 4L, NZP or ZP CSI-RS may be transmitted / set in seventh OFDM symbols (4l-03). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, a detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4l-03 can be set in accordance with Embodiments 4-1 and 4-2. In this example, the resource 4l-01a for DMRS transmission is assumed to be transmitted in the 3rd and 4th OFDM symbols, so as to support fast PDSCH decoding of the UE or to support simultaneous transmission of DL / UL in one slot. In the first two OFDM symbols (4l-04) of 4l-03, DMRS and CSI-RS can be TDM / FDM / CDM.

In the second example of FIG. 4L, in order to avoid resources (4l-00) for PDCCH transmission and resources (4l-02) for transmitting LTE CRS, NZP or ZP CSI-RS may be transmitted / set in 11th OFDM symbols (4l-05). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4l-05 can be set in accordance with Embodiments 4-1 and 4-2. In this example, it is assumed that resources 4l-01b for DMRS transmission are transmitted in 3, 4, 9, and 10th OFDM symbols to provide accurate DMRS channel estimation for high-layer MIMO transmission or high-speed terminals. In the fourth OFDM symbol 4l-05 of 4l-05, DMRS and CSI-RS can be TDM / FDM / CDM in the OFDM symbol (4l-06). Even if a large number of CSI-RS ports are transmitted in one CSI-RS resource when transmitting CSI-RS in 4l-05, it is possible to transmit within a short time, If the number of DMRS REs is small, DMRS and CSI-RS can be transmitted in a short time.

In order to avoid resources (4l-00) for PDCCH transmission and resources (4l-02) for transmitting LTE CRS in the third example of Figure 4l, one slot consisting of 14 OFDM symbols, 6, 7, 10, NZP or ZP CSI-RS can be transmitted / set in 11th, 13th and 14th OFDM symbols (4l-07). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4l-07 can be set in accordance with Embodiments 4-1 and 4-2. In this example, it is assumed that resources 4l-01b for DMRS transmission are transmitted in 3, 4, 9, and 10th OFDM symbols to provide accurate DMRS channel estimation for high-layer MIMO transmission or high-speed terminals. In the third OFDM symbol (4l-08) of the 6 OFDM symbols of 4l-07, the DMRS and CSI-RS can be TDM / FDM / CDM. Even if a large number of CSI-RS ports are transmitted in one CSI-RS resource when transmitting CSI-RS in 4l-07, it is possible to transmit within a short time, If the number of DMRS REs is small, DMRS and CSI-RS can be transmitted in a short time.

4M is a diagram illustrating examples for coexistence between various signals such as NR CSI-RS / NR DMRS / LTE CRS through subgrouping of NR CSI-RS resources.

In order to avoid resources (4m-00) for PDCCH transmission and resources (4m-01) for DMRS transmission in the first example of FIG. 4m, a 5th, 6th, 7th and 8th OFDM NZP or ZP CSI-RS can be transmitted / set in symbols (4m-03, 4m-04). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, a detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4m-03 and 4m-04 can be set in accordance with Embodiments 4-1 and 4-2. In this example, resource 4m-01 for DMRS transmission is assumed to be transmitted in 3, 4, 9, and 10th OFDM symbols to provide accurate DMRS channel estimation for high-layer MIMO transmission or high-speed terminals. In this example, 4m-04, which is likely to collide with LTE CRS, has a lower priority than 4m-03, which is unlikely to collide with other signals. For example, when setting a CSI-RS resource with a low number of CSI-RS ports of 8 or fewer, 4m-03 can be used preferentially. In addition, if the number of CSI-RS ports is set to 8 or more, It is possible to additionally use 4m-04. In this case, if the LTE CRS and the NR CSI-RS are transmitted together at 4m-04, the base station can apply a separate CSI-RS power boosting to 4m-04 and 4m-03. information parameter Pc.

In the second example of FIG. 4M, in order to avoid resources (4m-00) for resource and DMRS transmission for the PDCCH transmission, OFDM symbol 5, 6, 7, 8, 13 and 14 in one slot of 14 OFDM symbols NZP or ZP CSI-RS can be transmitted / set in the uplink (4m-05, 4m-06). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. At this time, a detailed RE pattern configuration for NZP CSI-RS, ZP CSI-RS, and ZP SRS in 4m-05 and 4m-06 can be set in accordance with Embodiments 4-1 and 4-2. In this example, 4m-06, which is likely to collide with LTE CRS, has a lower priority than 4m-05, which is unlikely to collide with other signals. For example, when setting a CSI-RS resource with a low number of CSI-RS ports of 8 or fewer, 4m-05 can be preferentially used. In addition, when setting more than 8 CSI-RS ports, It is possible to additionally use 4m-06. In this case, if LTE CRS and NR CSI-RS are transmitted together at 4m-06, the base station can apply separate CSI-RS power boosting at 4m-06 and 4m-05. it is possible to transmit them via the information parameter PCs.

In order to avoid resources (4m-00) for the PDCCH transmission and resources (4m-01) for the DMRS transmission in the third example of Figure 4m, 3, 4, 5, 6, 7 NZP or ZP CSI-RS can be transmitted / set in 8th, 13th and 14th OFDM symbols (4m-07, 4m-08, 4m-09, 4m-10). If one slot is composed of 7 or less OFDM symbols, the OFDM symbol number can be changed accordingly. The detailed RE pattern configuration for NZP CSI-RS or ZP CSI-RS, ZP SRS in 4m-07, 4m-08, 4m-09 and 4m-10 is set in accordance with Example 4-1 and Example 4-2 This is possible. In this example, 4m-08, which is likely to collide with LTE CRS, or 4m-09, which should be multiplexed with DMRS, has a lower priority than 4m-07 or 4m-10 which is unlikely to collide with other signals. For example, when setting a CSI-RS resource with a low number of CSI-RS ports of 8 or fewer, 4m-07 or 4m-10 may be preferentially used. If more than 8 CSI-RS ports are set, 07 and 4m-10, as well as 4m-08 and 4m-09. In this case, the base station can apply a separate CSI-RS power boosting to each CSI-RS transmission location 4m -07, 4m-08, 4m-09, 4m-10 according to various reasons such as coexistence with LTE CRS or DMRS. It is possible to transmit information on this through a plurality of power boosting information parameters Pc. In particular, 4m-10 is not used by NZP UE-specific CSI-RS configuration for CSI acquisition, but it can be used for ZP CSI-RS or cell-specific NZP CSI-RS for time / frequency tracking.

[Example 4-5 Example: CSI-RS port & resource mapping]

4A, 4n, 4nc and 4nd, 4oa, 4ob, 4oc, 4od and 4oe are examples of CSI-RS port mapping examples for CSI-RS resources according to the above embodiments .

Referring to Figures 4na, 4nb, 4nc and 4nd, 4n-00 represents two PDCCH OFDM symbols, two front-loaded DMRSs and one or more additional DMRS OFDM symbols. 4n-00, it is possible to transmit the CSI-RS to the {5, 6, 7, 8, 13, 14} th OFDM symbol. At this time, when UL and DL coexist in one slot, the number of CSI-RS OFDM symbols actually used in accordance with guard period (GP) and PUCCH symbol can be appropriately adjusted. For example, if one GP OFDM symbol and a PUCCH OFDM symbol are set, the {13, 14} th OFDM symbol is not set as a CSI-RS resource.

For 2-port CSI-RS transmission in an environment such as 4n-00, 36 2-port CSI-RS resources such as 4n-10 can be defined. If you want to avoid collision with LTE CRS, the settings {0, 1, 2, 3, 4, 5, 18, 19, 20, 21, 22, 23} are not used in 4n-10. In the 4-port CSI-RS, it is possible to define a total of 18 CSI-RS resources based on 4 REs adjacent to each other on the frequency / time axis, such as 4n-30. In this case, one CDM-4 can be applied to one 4-port CSI-RS resource or two length 2 CDM-T can be applied. In case of avoiding collision with LTE CRS, it is possible to define CSI-RS resource with a new pattern that does not use 5th and 8th OFDM symbols like 4n-40. In the case of 8-port CSI-RS, it is possible to define a total of 6 CSI-RS resources based on 8 REs adjacent to each other on the frequency / time axis, such as 4n-50. At this time, it is possible to apply one CDM-8 to one 8-port CSI-RS resource or two length 4 CDM-Ts. If it is desired to avoid collision with the LTE CRS, it is possible to define the CSI-RS resource by leaving the 7th OFDM symbol as 4n-60. It is possible to define three CSI-RS resources consisting of 24 REs, such as 4n-70 or 4n-80 for 24-port CSI-RS. CDM-2, CDM-4, or CDM-8 can be applied to each CSI-RS resource. In the case of CDM-2, CDM-T is applied to two adjacent REs on the time axis. CDM-T / F is applied to four adjacent REs in the time and frequency axes, and CDM-T / F is applied to eight adjacent REs in the time and frequency axes in the case of CDM-8. If it is desired to avoid collision with the LTE CRS, it is possible to define two CSI-RS resources that do not use the fifth and eighth OFDM symbols, such as 4n-80.

Referring to FIGS. 4oa, 4b, 4oc, 4od and 4oe, 4o-00 represents three PDCCH OFDM symbols, two front-loaded DMRSs and one or more additional DMRS OFDM symbols. 4o-00, it is possible to transmit the CSI-RS to the {6, 7, 8, 9, 13, 14} th OFDM symbol. At this time, when UL and DL coexist in one slot, the number of CSI-RS OFDM symbols actually used in accordance with guard period (GP) and PUCCH symbol can be appropriately adjusted. For example, if one GP OFDM symbol and a PUCCH OFDM symbol are set, the {13, 14} th OFDM symbol is not set as a CSI-RS resource.

For 2-port CSI-RS transmission in the environment of 4o-00, 36 2-port CSI-RS resources such as 4o-10 can be defined. If it is desired to avoid collision with the LTE CRS, it is possible to define the CSI-RS resource by leaving the 8th OFDM symbol as 4o-20. It is possible to define a total of 18 CSI-RS resources based on 4 REs adjacent to each other on the frequency / time axis, such as 4o-30 in case of 4-port CSI-RS. In this case, one CDM-4 can be applied to one 4-port CSI-RS resource or two length 2 CDM-T can be applied. If it is desired to avoid collision with LTE CRS, it is possible to define the CSI-RS resource by leaving the 8th OFDM symbol as 4o-40. In the case of 8-port CSI-RS, it is possible to define a total of 6 CSI-RS resources based on 8 REs adjacent to each other on the frequency / time axis, such as 4o-50. At this time, it is possible to apply one CDM-8 to one 8-port CSI-RS resource or two length 4 CDM-Ts. If it is desired to avoid collision with the LTE CRS, it is possible to define the CSI-RS resource by leaving the 8th OFDM symbol as 4o-60. It is possible to define three CSI-RS resources consisting of 24 REs such as 4o-70 or 4o-80 for 24-port CSI-RS. CDM-2, CDM-4, or CDM-8 can be applied to each CSI-RS resource. In the case of CDM-2, CDM-T is applied to two adjacent REs on the time axis. CDM-T / F is applied to four adjacent REs in the time and frequency axes, and CDM-T / F is applied to eight adjacent REs in the time and frequency axes in the case of CDM-8. If it is desired to avoid collision with LTE CRS, it is possible to define the CSI-RS resource by leaving the 8th OFDM symbol as 4o-80.

In addition, CSI-RS resources can be defined for the 8, 12, 16, 24, and 32 ports, which are not described in this example, by the above-described aggregation method.

[Example 4-6 Example: CDM setting method for CSI-RS transmission]

The base station can indicate the CDM application pattern and CDM group pattern for each CSI-RS resource through upper layer signaling. For example, the base station may provide upper layer signaling to apply at least one of {CDM off, CDM-2, CDM-4, CDM-8} to the terminal. Meanwhile, the CDM signaling may be implicitly defined according to CSI-RS transmission conditions. For example, the MS can determine whether CDM is applied according to the number of CSI-RS ports or the CSI-RS RE pattern. In this case, it is possible to promise to assume CDM off when the number of CSI-RS ports is 2 or less or 4, or when all CSI-RS ports are transmitted in one OFDM symbol. As another example, it is possible to determine whether CDM is applied according to the purpose of CSI-RS transmission. In this case, if CSI-RS is used for time / frequency tracking purpose (if set by MIB or SIB) or for beam management purposes (if subtime unit is set, ie CSI-RS OFDM symbol and data OFDM it is possible to promise to assume CDM off if the subcarrier spacing of the symbol is different or if the CSI-RS is transmitted in the IFDMA scheme).

Although it is assumed that there is one CDM setting signaling in the above example, it is also possible to apply signaling for CDM-T (time) and CDM-F (frequency) separately in practice. It is also possible to turn off only the CDM-T or turn off only the CDM-F.

[Example 4-7 Example: CSI-RS bandwidth setting method]

The CSI-RS resource configuration in NR includes information (bandwidth and transmission location) explicitly or implicitly about the CSI-RS transmission bandwidth. In this case, the CSI-RS transmission bandwidth set by the upper layer may include at least one of the following options (system BW, bandwidth part index, scheduled resource, explicit signaling (e.g., bit map or starting RB & ending RB). If the CSI-RS bandwidth is set to the system BW, the corresponding CSI-RS is transmitted to the full band. If the CSI-RS bandwidth is set to the bandwidth part, the base station must inform the UE of information on the bandwidth part indices through which the CSI-RS is transmitted. However, if the CSI-RS hopping based on a predetermined pattern, the information related to the bandwidth part index may be omitted.

If the CSI-RS bandwidth is set as the scheduling resource, it is possible to apply one of the following two options. The first is to transmit all within the band including a) minimum scheduled RB to maximum scheduled RB. In this case, the BS can transmit all the CSI-RSs from the RB of the lowest index allocated to the UE to the RB of the highest index. It is obvious that transmission in some RBs can be omitted according to the set CSI-RS RE density at this time. In this example, the CSI-RS transmission pattern does not change according to the resource allocation type (localized allocation or distributed allocation). The second method is to perform CSI-RS transmission only within the scheduling RB. In this case, the BS can transmit the CSI-RS only to the RB assigned the actual PDSCH among the RB (or RBG) having the highest index from the RB (or RBG) of the lowest index allocated to the UE. It is obvious that transmission in some RBs can be omitted according to the set CSI-RS RE density at this time. In this example, the CSI-RS transmission pattern is changed according to the resource allocation type (localized allocation or distributed allocation).

When determining the CSI-RS transmission band using explicit signaling, it is possible to apply one of the following two options. The first is to indicate whether a) CSI-RS is transmitted in the band represented by each bit through a bit map. At this time, the CSI-RS transmission bandwidth is set to a small granularity compared to resource allocation or PRB bundling. Therefore, it is possible to define a table separately to define a CSI-RS transmission band represented by each bit, but it is also possible to promise to have a size of N times based on the RBG size table as shown in Table 4a. This has the advantage of reducing the bitmap payload for CSI-RS bandwidth setting to 1 / N times the bitmap payload for resource allocation. The N may be defined in advance as a specific value, or may be determined by a value such as a system BW or a bandwidth part of a bandwidth part, a UE maximum BW, or the like, or may be directly set through upper layer signaling. It is obvious that transmission in some RBs can be omitted according to the set CSI-RS RE density at this time. (B) the RB with the lowest index of the starting point of the band in which the CSI-RS is transmitted, that is, the RB (or RBG), and the index of the RB having the highest index among the end points, i.e., RB Method. Also in this case, it is possible to limit the RB (or RBG) index that can be selected as the starting point or the ending point as in the method a). Also, it is apparent that the transmission in some RBs may be omitted according to the CSI-RS RE density set at this time.

[Table 4b] An example of resource allocation RBG size vs. Downlink System Bandwidth

<Fifth Embodiment>

For example, 3GPP's High Speed Packet Access (HSPA), LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced Which provides high-speed and high-quality packet data services such as LTE-A, LTE-Pro, High Rate Packet Data (HRPD) of 3GPP2, Ultra Mobile Broadband (UMB), and IEEE 802.16e Communication system.

In the LTE system, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is used in a downlink (DL) and a Single Carrier Frequency Division Multiple (SC-FDMA) scheme is used in an uplink Access) method. The uplink refers to a radio link through which a UE (User Equipment) or an MS (Mobile Station) transmits data or control signals to a base station (eNode B or base station (BS) The term &quot; wireless link &quot; In the above multiple access scheme, the data or control information of each user is classified and operated so that the time and frequency resources for transmitting data or control information for each user do not overlap each other, that is, orthogonality is established. do.

As future communication system after LTE, that is, 5G communication system must be able to freely reflect various requirements of users and service providers, services that satisfy various requirements must be supported at the same time. Services to be considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (hereinafter referred to as mMTC), ultra reliable low latency communication URLLC).

eMBB aims to provide a higher data transfer rate than the data rates supported by traditional LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, an eMBB should be able to provide a peak transmission rate of 20 Gbps in the downlink and a maximum transmission rate of 10 Gbps in the uplink in view of one base station. In addition, the 5G communication system should provide a maximum transmission rate and at the same time provide an increased user perceived data rate of the terminal. In order to satisfy such requirements, various improvements in transmission and reception techniques are required including a further improved multi-input multi-output (MIMO) transmission technology. In addition, while 5G communication systems transmit signals using the transmission bandwidth of up to 20MHz in the 2GHz band used by the current LTE, the 5G communication system requires a frequency bandwidth wider than 20MHz in the frequency band of 3 to 6GHz or more than 6GHz, The data transmission speed can be satisfied.

At the same time, mMTC is considered to support application services such as Internet of Thing (IoT) in 5G communication systems. In order to efficiently provide Internet of things, mMTC is required to support connection of large terminals in a cell, enhancement of terminal coverage, improved battery time, and cost reduction of terminals. Object The Internet must be able to support a large number of terminals (for example, 1,000,000 terminals / km2) in a cell because it is attached to various sensors and various devices and provides communication functions. In addition, terminals supporting mMTC are more likely to be located in shaded areas that can not be covered by a cell, such as a building underground, due to the nature of the service, thus requiring a wider coverage than other services provided by the 5G communication system. Terminals supporting mMTC should be configured as inexpensive terminals and battery life time is required to be very long like 10 ~ 15 years because it is difficult to change the terminal battery frequently.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for mission-critical purposes. For example, remote control for a robot or a machine, industrial automation, unmanaged aerial vehicle, remote health care, emergency situation, Services used for emergency alert and the like can be considered. Therefore, the communication provided by URLLC should provide very low latency and very high reliability. For example, a service that supports URLLC must meet Air interface latency of less than 0.5 milliseconds and at the same time have a packet error rate of less than 10-5. Therefore, for a service supporting URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is necessary to allocate a wide resource in the frequency band in order to secure the reliability of the communication link Are required.

In order to support transmission of downlink and uplink transmission channels in a wireless communication system, related downlink control information (DCI) is required. The DCI in the conventional 4G LTE (Long Term Evolution) system includes DL scheduling assignment information required for a UE to appropriately receive and decode a Physical Downlink Shared Channel (PDSCH), which is a downlink data transmission channel, An uplink scheduling grant information for appropriately transmitting a physical uplink shared channel (PUSCH), which is a data transmission channel, and a power control command transmitted through a set of terminals. In LTE, the DCI is transmitted through a physical downlink control channel (PDCCH), which is a separate physical channel through which downlink control information is transmitted. One PDCCH carries a DCI message, and a plurality of terminals simultaneously transmit downlink and uplink A plurality of PDCCH transmissions are simultaneously performed in each cell.

Different control information generally have different DCI message sizes. Therefore, DCIs are categorized into different DCI formats, which are classified according to specific message size and usage. If the bandwidth is large, the actual message size depends on the cell bandwidth, since the more bits are required to indicate the resource allocation, and the actual message size may vary depending on various factors. The downlink DCI format to be decoded by the UE varies depending on a transmission mode set for the UE and is always decoded for a specific DCI format regardless of the transmission mode so that communication between the base station and the UE is not lost have. In addition, certain DCI formats are designed to have the same number of message bits to reduce complexity due to blind decoding.

On the other hand, the 5G wireless communication system can support not only a service requiring a high transmission rate but also a service having a very short transmission delay and a service requiring a high connection density. In order to satisfy various requirements and services of users, these scenarios should be able to provide various services having different transmission / reception methods and transmission / reception parameters in one system. In future, It is important to design so that the constraints imposed by the system do not occur. As an example of a method for supporting various services in a 5G communication system, a system supporting a plurality of subcarrier spacing in one system may be considered in the present invention. In addition, physical layer channels having a plurality of subcarrier intervals can be multiplexed and transmitted simultaneously on a time or frequency axis.

The 5G wireless communication system supports a plurality of subcarrier intervals and thus requires a change in the manner of transmitting downlink control information. For example, the resource allocation scheme may vary depending on the subcarrier interval, and thus the message size of the DCI may be different. Also, depending on the method of setting the sub-carrier interval of the PDSCH, the complexity for decoding the DCI may increase, or additional control information may be required, so that a base station and a terminal operation are additionally required.

Accordingly, the present invention proposes a method and apparatus for transmitting downlink control information suitable for a 5G wireless communication system.

5A is a diagram showing an example in which three services of 5G, i.e., eMBBs 5a-01, URLLCs 5a-02, and mMTCs 5a-03 are multiplexed and transmitted in one system. According to the example shown in FIG. 5A, in the 5G communication system, different transmission / reception techniques and transmission / reception parameters can be used between services in order to satisfy different requirements of the respective services.

Hereinafter, the frame structure of the LTE and LTE-A systems will be described in more detail with reference to the drawings.

5B is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in the LTE system in which the data or control channel is transmitted in the downlink.

In Fig. 5B, the abscissa represents the time domain and the ordinate axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol. N _symb (5b-02) OFDM symbols constitute one slot 5b-06 and two slots are combined to form one subframe 5b-05. . The length of the slot is 0.5 ms and the length of the subframe is 1.0 ms. The radio frame 5b-14 is a time domain unit consisting of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the total system transmission bandwidth is composed of a total of N _SC ^BW (5b-04) subcarriers.

The basic unit of resources in the time-frequency domain can be represented by an OFDM symbol index and a subcarrier index as a resource element 5b-12 (Resource Element, RE). Resource blocks (5b-08, Resource Block, RB or a Physical Resource Block, PRB) is N _symb (5b-02) consecutive N _SC ^RB (5b-10) consecutive sub-in OFDM symbols and the frequency domain in the time domain Carrier. Therefore, one RB 5b-08 is composed of N _symb x N _SC ^RB REs 5b-12. In general, the minimum transmission unit of data is the RB unit. In the LTE system, N _symb = 7 and N _SC ^RB = 12 in general, and N _SC ^BW and N _SC ^RB are proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the UE. The LTE system defines and operates six transmission bandwidths. In the case of an FDD system in which the downlink and the uplink are classified by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 5a shows the correspondence between the system transmission bandwidth (N _RB ) and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth has a transmission bandwidth of 50 RBs.

[Table 5a]

The frame structure of the LTE and LTE-A systems is designed considering general voice / data communication. Therefore, it is limited in scalability to satisfy various services and requirements like 5G system. Therefore, in 5G system, it is necessary to define and operate frame structure flexibly considering various services and requirements. As an example, it may be considered that each service has a different subcarrier interval depending on the requirements. Currently, two schemes are considered to support multiple subcarriers in the 5G communication system. As a method for supporting a plurality of subcarriers in a 5G communication system, a set of subcarrier intervals that a 5G communication system can have can be determined using Equation (1) below.

[Equation 1]

? F _m = f ₀ 2 ^m (m is a subcarrier interval index)

Where f ₀ represents the basic sub-carrier of the system gangyeokreul, m represents an integer scaling factor, for example, f _0, is 15kHz speaking, a set (set) of the subcarrier interval in a communication system may have 5G is 7.5KHz, 15KHz, 30KHz, 60KHz, 120KHz, etc., and the system can be configured using all or part of the set. In accordance with the above method, the present invention will be described on the assumption that a 15KHz, 30KHz, 60KHz subcarrier interval set with f ₀ of 15 kHz is used in a 5G communication system. However, the technique proposed in the present invention can be applied without limitation to other sets of subcarrier intervals (for example, f ₀ is 17.5 KHz, subcarrier interval sets 17.5 KHz, 35 KHz, 70 KHz). If the subcarrier spacing set 17.5 KHz, 35 KHz, 70 KHz is considered in the present invention, f ₀ may be mapped to a technique described on the basis of 15 kHz. Likewise, 35 kHz, 70 kHz, and 140 kHz are mapped on a one-to-one basis with 30 kHz, 60 kHz, and 120 kHz, respectively, so that the present invention can be described.

5C is a diagram showing a resource element 5c-00 in the case where subcarrier intervals are Δf ₁ (5c-01), Δf ₂ (5c-02), and Δf ₃ (5c-03). In the example of FIG. 6C, the values of the subcarrier intervals of the resource elements, i.e., Δf ₁ (5c-01), Δf ₂ (5c-02), and Δf ₃ (5c-03) are 15 kHz, 30 kHz, . In addition, each resource element has an OFDM symbol length of T _s (5c-04), T _s ' (5c-05), T _s "(5c-06). Since the subcarrier interval and the length of the OFDM symbol are inversely related to each other due to the characteristic of the OFDM symbol, it can be confirmed that the symbol length becomes shorter as the subcarrier interval becomes larger. Therefore, T _s (5c-04) is four times the two times T _s "(5c-06) in _{T s' (5c-05)} .

The various sets of subcarrier intervals described above may be used for various purposes within a system. For example, considering a channel condition (multi-path delay spread or coherence bandwidth) of a corresponding band at a low carrier frequency such as a frequency band of 2 GHz to 4 GHz, It may be appropriate to use a carrier interval. For example, at a center frequency of the 2 GHz to 4 GHz band, it is advantageous to use a low subcarrier spacing since the path delay spread is relatively large and therefore the coherence frequency bandwidth is small. At the same time, in a band having a high center frequency of 6 GHz or more, it is advantageous to use a wide subcarrier interval because the influence due to the channel condition and the Doppler shift and the frequency offset is more serious. At the same time, the 5G communication system can use a high subcarrier interval for a system with very low transmission delay time requirements, such as URLLC, even at low center frequency bands.

Next, resource allocation methods of LTE and LTE-A systems will be described in detail with reference to the drawings.

FIG. 5D shows a resource allocation (RA) type supported by LTE.

5D, LTE supports three types of resource allocation schemes (resource allocation type 0 (5d-01), resource allocation type 1 (5d-02), resource allocation type 2 (5d-03) do.

In the resource allocation type 0 (5d-01) of FIG. 5D, discontinuous RB allocation is supported on the frequency axis and the allocated RB is indicated using a bitmap (bitmap, 5d-04). In this case, if the corresponding RBs are displayed with a bitmap (5d-04) of the same size as the number of RBs, a very large bitmap (5d-04) must be transmitted for a large cell bandwidth, resulting in a high control signaling overhead have. Therefore, in the resource allocation type 0 (5d-01), a method of reducing the size of the bitmap (5d-04) by grouping the consecutive RBs in the frequency domain without referring to the respective RBs directly and referring to the group is used. For example, when the total transmission bandwidth is N _RB and the number of RBs per RBG (Resource Block Group) is P, a bitmap 5d-04 necessary for informing RB allocation information in resource allocation type 0 (5d-01) [N _RB / P]. The smaller the number of RBs per RBG, that is, the smaller the P value, the greater the flexibility of scheduling, while the greater the control signaling overhead. Therefore, the P value should be selected appropriately to reduce the number of bits required while maintaining sufficient resource allocation flexibility. In LTE, the P value is determined by the downlink cell bandwidth and may have a value from minimum 1 to maximum 4.

In resource allocation type 1 (5d-02) of FIG. 5D, resource allocation is performed by dividing an entire RBG set on the frequency axis into RBG subset. The number of subsets is given from the cell bandwidth, and the number of subsets of resource allocation type 1 (5d-02) is equal to the group size (P) of resource allocation type 0 (5d-01). The RB allocation information of the resource allocation type 1 (5d-02) is composed of three fields as follows.

- the first field (5d-05): the selected RBG subset indicator ([log ₂ (P)] bits)

- Second field (5d-06): Indication of shift of resource allocation in subset (1 bit)

- the third field (5d-07): a bitmap ([N _RB / P] - [log ₂ (P)] - 1 bit for the assigned RBG)

As a result, the total number of bits used in resource allocation type 1 (5d-02) is equal to [N _RB / P] and the number of bits required in resource allocation type 0 (5d-01). Therefore, a 1-bit indicator is added to indicate whether the resource allocation type is 0 (5d-01) or 1 (5d-02).

In the resource allocation type 2 (5d-03) of FIG. 5d, unlike the two resource allocation types described above, it does not depend on the bitmap. Instead, the resource allocation is indicated by the starting point and length of the RB allocation. Thus, resource allocation type 0 (5d-01) and 1 (5d-02) both support non-contiguous RB allocation while resource allocation type 2 (5d-03) supports only sequential allocation. As a result, the RB allocation information of the resource allocation type 2 (5d-03) is composed of two fields as follows.

- first field (5d-08): indicator indicating RB _start point (RB _start )

- second field (5d-09): Indicator indicating the length (L _CRBs ) of consecutively allocated RBs

In resource allocation type 2 (5d-03), the total number of bits of [log ₂ (N _RB (N _RB +1) / 2)] is used.

All three resource allocation types correspond to VRB (Virtual Resource Block). Resource allocation types 0 (5d-01) and 1 (5d-02) are directly mapped to PRB (Physical Resource Block) in the localized form of VRB. On the other hand, resource allocation type 2 (5d-03) supports both localized and distributed VRBs. Therefore, in Resource Allocation Type 2 (5d-03), there is an additional indicator to identify localized and distributed VRBs.

Next, the transmission method of DCI and DCI in the LTE and LTE-A systems will be described in detail.

In the LTE system, the scheduling information for the downlink data or the uplink data is transmitted from the base station to the mobile station through the DCI. The DCI defines various formats and determines whether it is scheduling information for uplink data or scheduling information for downlink data, whether it is a compact DCI having a small size of control information, and spatial multiplexing using multiple antennas Whether DCI is used for power control, and the like. For example, DCI format 1, which is scheduling control information for downlink data, is configured to include at least the following control information.

- Resource allocation type 0/1 flag: Notifies whether the resource allocation method is Type 0 or Type 1. Type 0 allocates resources by resource block group (RBG) by applying bitmap method. In the LTE system, the basic unit of scheduling is an RB (resource block) represented by a time and frequency domain resource, and the RBG is composed of a plurality of RBs and serves as a basic unit of scheduling in the type 0 scheme. Type 1 allows a specific RB to be allocated within the RBG.

- Resource block assignment: Notifies the RB allocated to data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Notifies the modulation scheme used for data transmission and the size of the transport block, which is the data to be transmitted.

- HARQ process number: Notifies the HARQ process number.

- New data indicator: Notifies HARQ initial transmission or retransmission.

- Redundancy version: Notifies redundancy version of HARQ.

- Transmit power control command for PUCCH (Physical Uplink Control CHannel): Notifies a transmission power control command for PUCCH, which is an uplink control channel.

The DCI is transmitted through a PDCCH or EPDCCH (Enhanced PDCCH), which is a downlink physical control channel, through channel coding and modulation processes.

Generally, the DCI is independently channel-coded for each UE, and then is composed of independent PDCCHs and transmitted. In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal and spread over the entire system transmission band.

The downlink data is transmitted through a Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH is transmitted after the control channel transmission interval. The scheduling information such as the specific mapping position in the frequency domain, the modulation scheme, and the like is notified by the DCI transmitted through the PDCCH.

Through the MCS having 5 bits among the control information configuring the DCI, the BS notifies the MS of the modulation scheme applied to the PDSCH and the size (transport block size, TBS) of the data to be transmitted. The TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) to be transmitted by the base station.

A CRC (Cyclic Redundancy Check) is attached to the DCI message payload, and the CRC is scrambled into a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs are used depending on the purpose of the DCI message, e.g., UE-specific data transmission, power control command or random access response. Soon, the RNTI is not explicitly transmitted but is included in the CRC computation and transmitted. Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the allocated RNTI, and if the CRC check result is correct, the UE can know that the corresponding message is transmitted to the UE.

The resource allocation of the PDCCH is based on a CCE (Control-Channel Element), and one CCE is composed of nine REGs (Resource Element Groups). Also, one REG is composed of four REs. The number of CCEs required for a particular PDCCH may be 1, 2, 4, or 8, depending on the channel coding rate of the DCI message payload. Thus, different CCE numbers are used to implement the link adaptation of the PDCCH.

In the LTE, the UE must detect a signal without knowing the information on the PDCCH. In the LTE, a search space representing a set of CCEs for blind decoding is defined. The search space is composed of a plurality of aggregates at the aggregation level of each CCE, which is not explicitly signaled but implicitly defined by function and subframe number by the terminal identity. In each subframe, the UE performs decoding on all possible PDCCHs that can be generated from the CCEs in the set search space, and processes the information declared valid to the UE through the CRC check. The search space is classified into a UE-specific search space and a common search space. The UEs in a certain group or all the UEs can check the common search space of the PDCCH to receive control information common to cells such as dynamic scheduling or paging message for system information. For example, the downlink scheduling assignment information for transmission of the SIB (System Information Block) -1 including the cell operator information can be received by checking the common search space of the PDCCH.

The DCI format to be decoded in the UE-specific search space depends on the transmission mode set for the UE. Therefore, it is not necessary to attempt to decode the DCI format other than the DCI format corresponding to the set transmission mode, which reduces the number of blind decoding attempts of the UE. The transmission mode is set through RRC (Radio Resource Control) signaling. However, since the correct subframe number is not specified when the setting is effective for the terminal, it may happen that the network and the terminal are set to different transmission modes for a specific time period. Therefore, in order to solve this problem, at least one DCI format is required to be decoded regardless of the transmission mode. In LTE, for example, the DCI format 1A is always decoded regardless of the transmission mode. As a result, the terminal must perform blind decoding for possible DCI formats as well as blind decoding according to the combination of CCEs in the search space.

 A method of transmitting downlink control information in the existing LTE and LTE-A has been described above. As described above, in a 5G communication system, a physical layer channel can be transmitted at various subcarrier intervals according to service requirements. At this time, the DCI transmission method can be changed according to the subcarrier interval. Some examples are described below.

First, the number of DCI message bits may vary depending on the resource allocation scheme, or the information included in the DCI may be different. For example, when the subcarrier interval used for transmission of the PDSCH changes, the number of resources used for RB allocation of the PDSCH can be changed according to the subcarrier interval. In the existing LTE, the scheduling granularity (i.e., RBG size) may be defined only for one subcarrier interval. However, when supporting a plurality of subcarrier intervals, an efficient RBG size must be considered. Because of the trade-off between resource allocation flexibility and control signaling overhead, depending on RBG size, an effective method of operation is needed in view of this.

Next, the operation of decoding the DCI may be changed according to a method of setting the subcarrier interval of the PDSCH. For example, if the PDSCH sub-carrier interval is set in advance, the UE does not need to consider the candidate group of the DCI message size according to the sub-carrier interval in decoding the DCI. On the other hand, if the subcarrier interval of the PDSCH is transmitted through the DCI, since the UE can not know the subcarrier interval before decoding the DCI, it is possible to perform additional blind decoding by the number of subcarrier intervals supported by the base station . Therefore, when supporting a plurality of subcarrier intervals, base station and terminal operations for transmitting downlink control information must be additionally defined.

In order to solve the above-described problems, the present invention proposes a method and apparatus for transmitting downlink control information suitable for a 5G wireless communication system supporting a plurality of subcarrier intervals. The method of transmitting downlink control information provided in the present invention can effectively transmit a DCI for various subcarrier intervals to allow a 5G communication system capable of simultaneously providing different requirements to operate more flexibly .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference numerals as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted.

The embodiments of the present invention will be described in detail with reference to LTE and 5G systems. However, the present invention is also applicable to other communication systems having a similar technical background and channel form. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

First, an effective resource allocation method according to a subcarrier interval and a method of generating a DCI message will be described. Hereinafter, the present invention will be described on the assumption that the subcarrier interval corresponding to 15 KHz, 30 KHz, and 60 KHz is used in the embodiment of the present invention. In the embodiment of the present invention, it is assumed that the number of subcarriers per ^RB , i.e., N _SC ^RB, is the same for all subcarrier intervals. Finally, in the embodiment of the present invention, regardless of the resource allocation method, N _RBG It is assumed that scheduling is performed in units of N _RBG, and N _RBG is defined as the number of RBs per RBG. However, it should be noted that the above assumption is only an example for clarifying the technique of the present invention, and the present invention can be applied to any environment in the same manner.

[Example 5-1]

5E is a diagram showing the number of RBs according to subcarrier intervals. More specifically, in FIG. 5E, three subcarrier intervals (Δf ₁ = 15 kHz (5e-02), Δf ₂ = 30 kHz (5e-03), Δf ₃ = 60 kHz -04), respectively. In the example Fig. 5e For a given system bandwidth △ f ₁ (5e-02) in (5e-01) For a total of 100 _{RB, △ f 2 (5e-} 03) a total of 50 RB, △ f ₃ (5e- 04), there are a total of 25 RBs. The number of RBs becomes smaller proportionally as the subcarrier interval becomes larger. Therefore, the number of RBs available for resource allocation depends on the subcarrier interval. Therefore, the BS can set the size of the N _RBG for resource allocation differently according to the subcarrier interval, and thus the DCI message size and the scheduling flexibility can be changed.

In the following, a method for setting a preferable N _RBG according to the subcarrier interval proposed by the present invention and a DCI generating method will be described.

[Method 1]

FIG. 5F is a diagram illustrating a resource allocation method 1 according to the fifth embodiment of the present invention. 5f shows a given system bandwidth 5f-04 for three subcarrier spacings, Δf ₁ = 15 kHz (5f-01), Δf ₂ = 30 kHz (5f-02), Δf ₃ = 60 kHz ). &Lt; / RTI &gt; In the illustrated sub-carrier interval △ f ₁ (5f-01) in Fig. _{5f, △ f 2 (5f-} 02), △ N RBG value of f ₃ (5f-03), i.e. _{N RBG # 1 (5f-05} ), N _RBG # 2 (5f-06) and N _RBG # 3 (5f-07) are all set to 4RB. This can be expressed by Equation (2) as follows.

&Quot; (2) &quot;

N _{RBG, m} = N _RBG for all m (m is a subcarrier interval index)

Soon, the N _RBG value can be determined by the system bandwidth regardless of the subcarrier spacing. The N _RBG setting scheme according to the method 1 has an advantage that the DCI message size can be efficiently reduced according to the subcarrier interval. The number of bits required for indicating the RB allocation among the DCI messages is reduced in proportion to the subcarrier interval. Inevitably, the DCI message size varies depending on the subcarrier interval for the same DCI format. Therefore, the UE may perform the blind decoding of the DCI, assuming a different number of message bits, depending on the case (for example, whether there is prior information on the subcarrier interval of the PDSCH). If there is no prior information on the sub-carrier interval of the PDSCH, the UE can implicitly know information on the sub-carrier interval of the PDSCH from the message size of the successfully decoded DCI.

[Method 2]

FIG. 5G is a diagram illustrating a resource allocation method 2 according to the fifth embodiment of the present invention. FIG. 5g shows a system bandwidth (5g-04) given for three subcarrier spacings, Δf ₁ = 15 kHz (5 g-01), Δ f ₂ = 30 kHz (5 g-02), Δ f ₃ = 60 kHz ). &Lt; / RTI &gt; 5G, the N _RBG values of the subcarrier spacing? F ₁ (5g-01),? F ₂ (5g-02), and? F ₃ (5g-03) are N _RBG # 1 4RB, N _RBG # 2 (5g-06) = 2RB and N _RBG # 3 (5g-07) = 1RB. This can be expressed by Equation (3) as follows.

&Quot; (3) &quot;

N _{RBG, m} = N _{RBG, 0/2} ^m for all m (m is a subcarrier interval index)

The N _RBG value may be scaled according to the subcarrier interval. In the example of FIG. 5G, the N _RBG values are scaled according to the subcarrier interval so that the size of the frequency band occupied by the N _RBG in which the actual scheduling is performed is Δf ₁ (5g-01) · N _RBG # 1 (5g-05) f ₂ (5g-02) N _RBG # 2 (5g-06) = Δf ₃ (5g-03) N _RBG # 3 (5g-07) = 60 kHz. In other words, the scheduling granularity is all the same. Therefore, the method 2 can obtain the same frequency diversity according to the scheduling irrespective of the subcarrier interval. Also, in the case of using the method 2, the number of bits necessary for instructing the RB allocation is the same regardless of the subcarrier interval. Therefore, the UE can perform decoding assuming the same number of bits regardless of the subcarrier interval for the same DCI format, so that the number of blind decodings does not increase according to the subcarrier interval. On the other hand, since the UE can not implicitly obtain information on the subcarrier interval from the DCI message size, the base station may use the information about the subcarrier interval (for example, depending on whether there is prior information on the subcarrier interval of the PDSCH) May be additionally transmitted through the DCI.

[Method 3]

5H is a diagram illustrating a resource allocation method 3 according to the fifth embodiment of the present invention. 5h shows the system bandwidth (5h-04) given for three subcarrier intervals, Δf ₁ = 15 kHz (5h-01), Δf ₂ = 30 kHz (5h-02), Δf ₃ = 60 kHz ). &Lt; / RTI &gt; In an exemplary implementation of 5g subcarrier interval _{△ f 1 (5h-01)} , △ f 2 (5h-02), △ f N RBG values of ₃ (5h-03) is _{N RBG # 1 (5h-05} ) each = 2RB, N _RBG # 2 (5h-06) = 4RB and N _RBG # 3 (5h-07) = 1RB. Method 3 can not be expressed in a generalized manner in a manner using the N _RBG values set individually for each subcarrier interval. The N _RBG values of each subcarrier may be determined by various system parameters and service environments. For example, the system bandwidth, the number of terminals in service, the delay time or the reliability requirement, and the radio channel environment may be parameters for determining the N _RBG . The N _RBG values that can be set for each subcarrier can be selected in various manners. Two examples are described below.

Alternative 1. N _{RBG, m} ∈ {arbitrary natural number}

Alternative 2. N _{RBG, m} ∈ N _{RBG, m} ^set (N _{RBG, where m} ^set is the entire set of N _RBG preset for Δfm)

Where m represents a subcarrier interval index. Alternative 1 shows a method of setting N _RBG to an arbitrary natural number. Alternative 2 may set an N _RBG value for the corresponding subcarrier interval within a predetermined set of N _RBGs . The set of the _RBG N N _RBG ^set can be different for each sub-carrier interval. Method 3 is advantageous in that N _RBG can be set considering both scheduling flexibility and DCI message transmission overhead according to system environment and subcarrier interval. On the other hand, additional information transmission is required for the N _RBG as well as the subcarrier interval. N _RBG values for each subcarrier may be set semi-static through RRC signaling or may be set static for each cell and inform the UE through system information SI. If no additional signaling for N _RBG is defined, in alternative 2, the DCI for that subcarrier interval can be obtained by performing blind decoding within the entire set of N _RBGs .

The above-described embodiment 5-1 of the present invention has been described above. In the fifth embodiment, a method for setting a preferable N _RBG according to a subcarrier interval and a method for generating a DCI have been described. Considering the DCI generation method according to the 5-1th embodiment, depending on the method of setting a subcarrier interval of the PDSCH in the base station, a method of transmitting the DCI at the base station and an operation of decoding the DCI at the terminal may be changed.

Therefore, the method of setting the sub-carrier interval of the PDSCH considered in the present invention and the DCI transmission and decoding operation according to the method will be described in detail below.

[Example 5-2]

5I is a diagram illustrating a 5G communication system according to a fifth embodiment of the present invention.

Also conducts a communication with the base station 5G (5i-01) and the terminal (5i-02) a plurality of sub-carrier interval, that is, _{△ f 1, △ f 2 (} 5i-03) According to 5i. At this time, a single or a plurality of subcarrier intervals used for actual communication can be set to some or all of the predefined whole set of subcarrier intervals (5i-04). Here, the whole set of subcarrier spacing (5i-04) means a whole set of subcarrier spacing supported by the 5G wireless communication system. According to the example shown in FIG. 5i, the entire set of subcarrier spacings 5i-04 is composed of three subcarrier intervals of? F1,? F2, and? F3, and two subcarriers of? F1 and? Communication is performed using the interval 5i-03. The set of subcarrier intervals 5i-03 to be used for actual communication among the entire set of subcarrier interval 5i-04 can be determined by the 5G base station 5i-01 and transmitted to the terminal 5i-02 in the form of RRC signaling or SI You can tell. Depending on the number of set subcarrier intervals, the system may operate at a single subcarrier interval or at multiple subcarrier spacings.

When the set sub-carrier interval set 5i-03 is one sub-carrier interval, the base station and the terminal perform communication using only one set sub-carrier interval.

When the set subcarrier interval set 5i-03 is made up of a plurality of subcarrier intervals, the physical layer channel used for data transmission, i.e., the subcarrier interval of the PDSCH, can be set to a plurality of subcarrier intervals. At this time, PDSCHs having different subcarrier intervals may be transmitted by a Time Division Multiplexing (TDM) scheme and a Frequency Division Multiplexing (FDM) scheme. If the PDSCHs with different subcarrier intervals are time-divided, the PDSCH is transmitted using one subcarrier interval at a specific time and the subcarrier interval used according to time may be different. If PDSCHs with different subcarrier spacing are frequency divided, PDSCHs set at a plurality of subcarrier intervals at a specific time can be simultaneously transmitted in different frequency ranges.

When a plurality of subcarrier intervals are used, the BS and the UE must know at which subcarrier interval the corresponding PDSCH is transmitted at a particular time or frequency resource at which the PDSCH is transmitted. In other words, an indicator for the subcarrier interval of the PDSCH is required. There may be a static / semi-static scheme or a dynamic scheme according to a scheme of setting a subcarrier interval of the PDSCH. When the subcarrier interval of the PDSCH is set to static / quasi-static, the indication of the subcarrier interval of the PDSCH is transmitted through a type of system information (SI), that is, a MIB (Master Information Block) And can be delivered to the terminal. On the other hand, when the subcarrier interval of the PDSCH is dynamically set, the indication of the subcarrier interval of the PDSCH can be transmitted to the UE through the PDCCH in the form of DCI.

When the subcarrier interval of the PDSCH is set to static / quasi-static, the subcarrier interval of the PDSCH can be transmitted in the same or the same pattern for a specific time (until reset to RRC or SI is indicated). Therefore, the UE is aware of the subcarrier interval of the PDSCH before decoding the DCI. On the other hand, when the subcarrier interval of the PDSCH is dynamically set, the subcarrier interval of the PDSCH can be continuously changed. Since the subcarrier interval of the PDSCH can be indicated through the DCI, the UE has to decode the DCI without knowing the subcarrier interval of the PDSCH.

Whether to set the subcarrier interval of PDSCH statically or quasi-statically or dynamically can be set through RRC signaling. In addition, the static / quasi-static or dynamic setting can be cell-specific or UE-specific. Cell-specific setting means that all UEs in a cell are set to static / quasi-static setting or dynamic setting in common. Terminal-specific configuration means that certain terminals in the cell can be set to static or dynamic configuration. For example, if there are K terminals in a cell, the M (<K) terminals can be set to static / quasi-static and the remaining K-M terminals can be dynamically set.

In the fifth to eighth embodiments, a method of setting a sub-carrier interval of the PDSCH has been described. In the following embodiments, DCI generation methods according to the subcarrier interval described in the 5-1th embodiment and specific base station and terminal operations considering the method of setting the subcarrier interval of the PDSCH described in the 5-2th embodiment .

[Example 5-2-1]

In Embodiment 5-2-1, the DCI generation method of [Method 1] described in the 5-1 embodiment is considered.

5J is a diagram illustrating a base station and a terminal procedure according to Embodiment 5-2-1 of the present invention.

First, the base station procedure of the present invention will be described. First, the base station determines a set of subcarrier intervals to use for the actual service among the entire set of subcarrier intervals supported by the system (step 5j-01). In step 5j-02, the size of the set of set subcarrier intervals is discriminated, and it is determined whether the PDSCH is transmitted in a single subcarrier interval or in a plurality of subcarrier intervals. If the size of the subcarrier interval set in step 5j-02 is greater than 1, the PDSCH can be transmitted at a plurality of subcarrier intervals. The base station determines how to set the subcarrier interval for the PDSCH in step 5j-03. As described in the fifth embodiment, the subcarrier interval of the PDSCH can be set to static, quasi-static, or dynamically. In step 5j-04, the base station determines whether the sub-carrier interval of the PDSCH is dynamically set. If the sub-carrier interval of the PDSCH is not dynamically set, that is, if it is set to static / quasi-static, in step 5j-05, an indicator of the sub-carrier interval of the PDSCH is transmitted to the UE in the form of RRC, MIB, or SIB. If the sub-carrier interval of the PDSCH is set dynamically, the base station skips step 5j-05 and proceeds to step 5j-06. In step 5j-06, the base station determines a subcarrier interval to transmit the PDSCH and generates a corresponding DCI. At this time, the value of N _RBG corresponding to the subcarrier interval of the PDSCH is used as a preset value according to [Method 1] of the fifth embodiment, and the number of message bits of the DCI is determined accordingly. In step 5j-07, the generated DCI and PDSCH are transmitted. If the size of the subcarrier interval set in step 5j-02 is equal to 1 and the PDSCH is transmitted in a single subcarrier interval, the process directly goes to step 5j-06. In step 5j-06, the base station generates a DCI corresponding to the subcarrier interval of the PDSCH according to [Method 1] of the embodiment 5-1. Similarly, the DCI and PDSCH generated in steps 5j-07 are transmitted.

Next, the terminal procedure of the present invention will be described. In step 5j-11, the UE determines the size of the set of subcarrier intervals set in the current system and determines whether the PDSCH is transmitted in a single subcarrier interval or in a plurality of subcarrier intervals. In step 5j-11, if the size of the subcarrier interval set is greater than 1, the UE determines in step 5j-12 whether the subcarrier interval setting scheme is static / quasi-static or dynamic. If the subcarrier interval setting scheme is static / quasi-static, the UE receives an indicator of the sub-carrier interval of the PDSCH in the form of RRC, MIB, or SIB in step 5j-13. The UE performs DCI decoding based on the sub-carrier interval information of the PDSCH set in step 5j-14. If the subcarrier interval setting scheme is dynamically set in step 5j-12, the UE performs blind decoding on the DCI in step 5j-15. Wherein DCI blind decoding is performed for possible subcarrier intervals within a predetermined subcarrier interval set. More specifically, when the predetermined set of subcarrier intervals is {? F1,? F2}, the UE can perform DCI decoding assuming that the subcarrier interval of the PDSCH is? F1 or? F2. At this time, when the DCI generation method of [Method 1] of the fifth embodiment is followed, the number of DCI message bits is different between Δf1 and Δf2. Therefore, the terminal can perform decoding based on the number of DCI message bits corresponding to? F1, and can perform decoding based on the number of DCI message bits corresponding to? F2 (blind decoding). In step 5j-16, if the DCI decoding is successful for a specific subcarrier interval, the UE can acquire information on the subcarrier interval of the PDSCH therefrom. In step 5j-17, the UE can receive the PDSCH based on the acquired DCI control information. In step 5j-11, if the set size of the set subcarrier interval is equal to 1, the UE directly performs DCI decoding based on the subcarrier interval information of the PDSCH in step 5j-14. Similarly, in step 5j-17, the UE can receive the PDSCH based on the acquired DCI control information.

[Example 5-2-2]

In Embodiment 5-2-2, the DCI generation method of [Method 2] described in the 5-1 embodiment is considered.

5K is a diagram illustrating a base station and a terminal procedure according to Embodiment 5-2-2 of the present invention.

First, the base station procedure of the present invention will be described. First, the base station determines a set of subcarrier intervals to be used for the actual service among the entire set of subcarrier intervals supported by the system (step 5k-01). In step 5k-02, the size of the set of set subcarrier intervals is discriminated to determine whether the PDSCH is transmitted in a single subcarrier interval or in a plurality of subcarrier intervals. If the size of the subcarrier interval set in step 5k-02 is greater than 1, the PDSCH can be transmitted at a plurality of subcarrier intervals. The base station determines how to set the subcarrier interval for the PDSCH in step 5k-03. In step 5k-04, the base station determines whether the subcarrier interval of the PDSCH is set dynamically. If the sub-carrier interval of the PDSCH is not dynamically set, that is, if it is set to static / quasi-static, in step 5k-05, an indicator of the sub-carrier interval of the PDSCH is transmitted to the UE in the form of RRC, MIB, or SIB. If the sub-carrier interval of the PDSCH is dynamically set, the base station adds an indication of the sub-carrier interval of the PDSCH to the DCI in step 5k-06 and transmits it to the UE. In step 5k-07, the base station determines a subcarrier interval to transmit the PDSCH and generates a corresponding DCI. At this time, the value of N _RBG corresponding to the subcarrier interval of the PDSCH is used as a preset value according to [Method 2] of the fifth embodiment, and the number of message bits of the DCI is determined accordingly. In steps 5k-08, the generated DCI and PDSCH are transmitted. If the size of the set of subcarrier intervals set in step 5k-02 is equal to 1, and the PDSCH is transmitted in a single subcarrier interval, the process directly goes to step 5k-07. In step 5k-07, the base station generates a DCI corresponding to the subcarrier interval of the PDSCH according to [Method 2] of the fifth embodiment. Similarly, the DCI and PDSCH generated in steps 5k-08 are transmitted.

Next, the terminal procedure of the present invention will be described. In step 5k-11, the UE determines the size of the sub-carrier interval set in the current system and determines whether the PDSCH is transmitted in a single sub-carrier interval or in a plurality of sub-carrier intervals. If the size of the subcarrier interval set in step 5k-11 is greater than 1, the UE determines in step 5k-12 whether the subcarrier interval setting scheme is static / quasi-static or dynamic. If the subcarrier interval setting scheme is static / quasi-static, the UE receives an indicator of the sub-carrier interval of the PDSCH in the form of RRC, MIB, or SIB in step 5k-13. Based on the set sub-carrier interval information of the PDSCH, the UE performs decoding on the DCI in step 5k-14. If the subcarrier interval setting scheme is dynamically set in step 5k-12, the UE performs decoding for the DCI in step 5k-15. Unlike Embodiment 5-2-1, in Embodiment 5-2-2, the message bit number of the DCI is constant regardless of the subcarrier interval according to [Method 2] of the embodiment 5-1. Therefore, it is not necessary to perform blind decoding of the DCI for the subcarrier interval. In step 5k-16, the UE acquires sub-carrier interval information for the PDSCH from the DCI. In step 5k-17, the UE can receive the PDSCH based on the acquired DCI control information. If the size of the set of subcarrier spacing set in step 5k-11 is equal to 1, the UE immediately performs DCI decoding based on the subcarrier interval information of the PDSCH in step 5k-14. Similarly, in step 5k-17, the UE can receive the PDSCH based on the acquired DCI control information.

[Example 5-2-3]

In Embodiment 5-2-3, a DCI generation method of [Method 3] described in the 5-1 embodiment is considered.

First, the base station procedure of the present invention will be described. First, the base station determines a set of subcarrier intervals to be used for the actual service among the entire set of subcarrier intervals supported by the system in steps 5l-01. In steps 5l-02, it is determined whether the PDSCH is transmitted in a single sub-carrier interval or in a plurality of sub-carrier intervals by determining the size of a set of set sub-carrier intervals. If the size of the subcarrier interval set in step 5l-02 is greater than 1, the PDSCH can be transmitted at a plurality of subcarrier intervals. The base station determines the manner in which to set the subcarrier interval for the PDSCH in steps 5l-03. In step 5l-04, the base station determines whether the sub-carrier interval of the PDSCH is set dynamically. If the sub-carrier interval of the PDSCH is not dynamically set, that is, if it is set to static / quasi-static, an indicator for the sub-carrier interval of the PDSCH is transmitted to the UE in the form of RRC, MIB, or SIB in step 5l-05. If the sub-carrier interval of the PDSCH is dynamically set, the base station adds an indication of the sub-carrier interval of the PDSCH to the DCI in steps 5l-06, and transmits it to the UE. According to the DCI generation method described in [Method 3] of the fifth embodiment, the base station first determines an N _RBG value corresponding to a subcarrier to which the PDSCH is to be transmitted in steps 5l-07. In step 5l-08, an indicator for the N _RBG value is transmitted to the UE in the form of RRC, MIB, or SIB. In steps 5l-09, the base station generates a DCI corresponding to the determined sub-carrier interval and the N _RBG value of the PDSCH. At this time, the number of message bits of the DCI is determined by the subcarrier interval and the N _RBG value of the PDSCH according to [Method 3] of the fifth embodiment. In steps 5l-10, the generated DCI and PDSCH are transmitted. If the size of the set of subcarrier intervals set in steps 5l-02 is equal to 1 and the PDSCH is transmitted in a single subcarrier interval, the process directly goes to step 5l-09. In steps 5l-09, the base station generates a DCI corresponding to the subcarrier interval of the PDSCH, and similarly, the DCI and the PDSCH generated in step 5l-10 are transmitted.

Next, the terminal procedure of the present invention will be described. In step 5l-11, the UE determines the size of the set of subcarrier intervals set in the current system and determines whether the PDSCH is transmitted in a single subcarrier interval or in a plurality of subcarrier intervals. If the size of the set of subcarrier intervals set in step 5l-11 is larger than 1, the UE receives an indicator for N _RBG in the form of RRC or MIB, SIB in step 5l-12. In step 5l-13, the UE determines whether the subcarrier interval setting scheme is static / quasi-static or dynamic. If the subcarrier interval setting scheme is static / quasi-static, the UE receives an indicator of the sub-carrier interval of the PDSCH in the form of RRC, MIB, or SIB in step 5l-14. The UE performs DCI decoding based on the N _RBG setting information and the subcarrier interval of the PDSCH set in steps 5l-15. If the subcarrier interval setting scheme is set dynamically in steps 5l-13, the UE performs blind decoding for the DCI in steps 5l-16. At this time, the DCI blind decoding is performed for possible subcarrier intervals within a predetermined subcarrier interval set as described in the embodiment 5-2-1. In step 5l-17, the UE acquires sub-carrier interval information for the PDSCH from the DCI. In step 5l-18, the UE can receive the PDSCH based on the obtained DCI control information. If the size of the subcarrier interval set in step 5l-11 is equal to 1, the UE directly performs DCI decoding based on the subcarrier interval information of the PDSCH in step 5l-15. Similarly, in step 5l-17, the UE can receive the PDSCH based on the obtained DCI control information.

In order to perform the above-described embodiments of the present invention, a transmitter, a receiver, and a controller of a terminal and a base station are shown in Figs. 5M and 5N, respectively. A method for transmitting downlink control information in a 5G communication system according to the 5-1 and 5-2 embodiments, and a method for transmitting and receiving a base station and a terminal for an apparatus are shown. To perform this, The transmitter, the receiver, and the processor of the terminal must operate according to the embodiment, respectively.

5M is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention. As shown in FIG. 5M, the terminal of the present invention may include a terminal processing unit 5m-01, a receiving unit 5m-02, and a transmitting unit 5m-03.

The terminal processor 5m-01 may control a series of processes that the terminal can operate according to the embodiment of the present invention described above. For example, the terminal operation can be controlled differently according to different numerical values according to the embodiment of the present invention, for example, setting items for the subcarrier interval and the like. In addition, control signals and data signals can be transmitted / received according to the downlink control information of the present invention, i.e., the DCI generation method and the subcarrier interval setting method for the physical layer channel. The terminal receiver 5m-02 and the terminal 5m-03 may collectively be referred to as a transmitter / receiver in the embodiment of the present invention. The transmitting and receiving unit can transmit and receive signals to and from the base station. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. In addition, the transceiving unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 5m-01, and transmit the signal output from the terminal processing unit 5m-01 through a wireless channel.

5n is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention. As shown in FIG. 5N, the base station of the present invention may include a base station processing unit 5n-01, a receiving unit 5n-02, and a transmitting unit 5n-03.

The base station processing unit 5n-01 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention. For example, the base station operation can be controlled differently according to different numerical values according to the embodiment of the present invention, for example, setting items for the subcarrier interval and the like. In addition, scheduling of uplink / downlink control channels and data channels can be performed according to the downlink control information, i.e., the DCI generation method and the subcarrier interval setting method for the physical layer channel, and the setup information can be instructed to the terminal.

The base station receiving unit 5n-02 and the base station transmitting unit 5n-03 may collectively be referred to as a transmitting and receiving unit in the embodiment of the present invention. The transmitting and receiving unit can transmit and receive signals to and from the terminal. The signal may include control information and data. To this end, the transmitting and receiving unit may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal and down-converting the frequency. In addition, the transmitting and receiving unit may receive a signal through a wireless channel, output it to the base station processing unit 5n-01, and transmit the signal output from the base station processing unit 5n-01 through a wireless channel.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible. In addition, each of the above embodiments can be combined and operated as needed.

Claims (1)

A method for processing a control signal in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting the second control signal generated based on the process to the base station.

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