KR20190028148A - Method, apparatus, and system for transmitting or receiving data in wireless communication system - Google Patents

Abstract

The present invention relates to a method for a base station to instruct a start position of a physical downlink control channel (PDSCH) in a mobile communication system and, more particularly, to a method, an apparatus, and a system for instructing a start position of a PDSCH to a terminal according to a control resource set (CORESET) allocated to the terminal via downlink control information (DCI). Additionally, the present invention relates to a method, an apparatus, and a system for allowing demodulation of PDSCH by receiving allocation and mapping information of the PDSCH from the start position of the PDSCH instructed from the base station via DCI, wherein the instructed start position of the PDSCH is received by the terminal.

Description

TECHNICAL FIELD [0001] The present invention relates to a method, apparatus, and system for transmitting and receiving data in a wireless communication system,

The present invention relates to a wireless communication system, and more particularly, to a wireless communication system in which a user terminal receives allocation information for data channel transmission through downlink control information, and transmits data channels using received downlink control information And more particularly, to a method, apparatus, and system for receiving 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, the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G network) communication system or after the 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 connection 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.

Generally, a mobile communication system has been developed to provide voice service while ensuring the user's activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service. However, in a mobile communication system in which a service is currently provided, a lack of resources and users demand higher speed services, and therefore, a more advanced mobile communication system is required.

As mentioned above, the 3GPP NR (New Radio) system is a 5G candidate system for supporting various future service scenarios. 3GPP NR (New Radio) can provide services such as Enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communication (URLLC) and Enhanced Machine-type communication (eMTC) to users with bandwidths up to 400 MHz.

Future 5G technology requires lower latency data transmission due to the emergence of new applications such as real-time control and tactile internet, and the 5G data request delay is reduced to 1ms . 5G aims to provide a data delay that is about 10 times lower than the conventional one. To solve this problem, 5G is expected to propose a communication system using a mini-slot having a shorter TTI period (e.g., 0.2ms) in addition to the existing slot (or subframe).

In order to perform data scheduling using the mini-slot, the BS must provide information on which RB (reuse block) in the frequency domain is used and which OFDM symbol in the time domain is allocated to the MS. And receive the scheduled data channel. This information can be transmitted through a downlink control channel (PDCCH) transmitted to the UE, and the UE can transmit downlink control information (DCI) included in the corresponding downlink control channel, The terminal can receive the related information. In resource allocation type-0 used for RB allocation in LTE, one bit is assigned per RB group (RBG), which is a bundle of RBs or a few RBs. If 1 bit is not used, if 1 is used, the corresponding RB or RBG is used to be. In addition, resource allocation type-2 is a method of informing the index of the starting RB and the number of consecutive RBs allocated when consecutive RBs are allocated in a reorsce indication value (RIV) scheme. Along with the RB allocation of LTE, there is a need for a description of how to transmit information on OFDM symbol allocation in the time domain.

The 3GPP NR system defines uplink / downlink physical channels for physical layer signal transmission. For example, a physical uplink shared channel (PUSCH) which is a physical channel for transmitting data in the uplink, a physical uplink control channel (PUCCH) for transmitting a control signal, and a physical random access channel (PRACH) A physical downlink shared channel (PDSCH) for transmitting data in the downlink, and a physical downlink control channel (PDCCH) for transmitting an L1 / L2 control signal. A downlink control channel (PDCCH) among the channels is a channel for transmitting uplink / downlink scheduling assignment control information, uplink transmission power control information, and other control information to one or a plurality of terminals. In order that one or a plurality of UEs can easily receive a downlink control channel (PDCCH), the PDCCH may be located in the first part OFDM symbol of one slot as a time domain resource and may be located in some resource in the frequency domain. A resource monitored by the UE in order to receive the PDCCH may be referred to as a control resource set (CORESET). The CORESET may assign one or more CORESET to one UE.

 In the structure of the PDCCH located in the CORESET in the 3GPP NR system, one CCE (Control Channel Element) is formed by grouping six REGs (Resource Element Groups) composed of one OFDM symbol and one PRB (Physical Resource Block) One or a plurality of CCEs are combined and transmitted. Here, the number of CCEs combined is referred to as a CCE aggregation level, and a resource to which a PDCCH is allocated according to a possible CCE coupling level is referred to as a search space. The search space may include a common search space defined for each base station and a terminal-specific or UE-specific search space defined for each terminal. The UE performs blind decoding on the number of possible CCE combining cases in the search space and can determine whether it corresponds to its own PDCCH through a user equipment (UE) identifier included in the PDCCH.

Generally, the amount of the PDCCH that needs to be transmitted may vary with time depending on the traffic environment of the user and the channel condition. If the size of the time-frequency resource of the CORESET to which the PDCCH can be transmitted is fixed, a plurality of PDCCHs can not be simultaneously allocated in the network, or a time-frequency resource of CORESET can be wasted by allocating only a small number of PDCCHs. Therefore, in order to use the CORESET time-frequency resources effectively, the size of the CORESET time-frequency resource can be changed according to the traffic environment and the channel conditions of the user and can be varied with time. Therefore, even if the UE indicates a region to which the PDSCH is allocated from the BS, a method of indicating a PDSCH region that can be actually used according to the PDCCH allocation of another UE in CORESET is needed.

A first problem to be solved by the present invention is to effectively provide PDSCH or PUSCH time-frequency domain allocation information to a UE through a downlink control information (DCI) in a 3GPP NR system. More specifically, when allocating consecutive physical resource blocks (PRB) and consecutive OFDM symbols, the payload length of the downlink control information to be transmitted is minimized.

A second problem to be solved by the present invention is to solve the problem that the UE can not know from which OFDM symbol in the slot the transmission of the PDSCH starts from the base station based on the slot which is the basic unit of scheduling in the 3GPP NR system, The UE attempts to solve the problem that it can not know from which OFDM symbol in the scheduled slot the PDSCH should be received.

A third problem to be solved by the present invention is to provide a method and apparatus for a mobile station in a 3GPP NR system where a base station scheduling PDCCH and a scheduled PDSCH exist in different slots, i.e., when a mobile station receives a PDCCH from a base station and a PDSCH scheduled from a PDCCH, The UE solves the problem that it can not know from which OFDM symbol the transmission of the PDSCH from the base station is started to the slot of the scheduled PDSCH. In other words, the user equipment can transmit any OFDM symbol The PDSCH must be received from the PDSCH.

The fourth problem to be solved by the present invention is that when a base station is scheduled for slot aggregation transmission in which a plurality of slots are scheduled for a terminal in the 3GPP NR system, that is, the terminal is scheduled to perform slot aggregation from the base station, (S) scheduled to perform slot aggregation from the base station. In other words, the user terminal can not know the slot (s) scheduled to perform the slot aggregation from the base station, The OFDM symbol can not know from which OFDM symbol the PDSCH should be received.

The objects that can be achieved by the present invention are not limited to those specifically described herein.

In order to notify the time-frequency domain allocation information, the base station generates RIV for the consecutive RB allocation in the frequency domain, generates RIV for the continuous RB allocation in the time domain, To link control information to the base station's independent RIV generation and transmission scheme.

In order to notify the time-frequency domain allocation information, the base station generates an RIV for consecutive RB allocation in the frequency domain, generates an RIV for continuous RB allocation in the time domain, encoding and transmitting the downlink control information, and a RIV analysis method of a terminal that interprets the joint encoded RIV into two RIVs.

In order to find a time-frequency resource for PDSCH reception in the allocated time-frequency domain, a technical aspect of the present invention is to provide a method for notifying a UE of PDSCH allocation information in a specific slot (s) (RESET) that can be used in the PDSCH in the DCI according to the time-frequency resource allocation used in the PDSCH in the DCI in such a manner that the allocation information of the PDSCH in the PDSCH can be known. To a method and apparatus for interpreting PDSCH allocation information.

In order to find a time-frequency resource for PDSCH reception in the allocated time-frequency domain, a technical aspect of the present invention is to provide a Node-B to a UE by using cross-slot scheduling, Slot scheduling from a base station, and the UE can know the start position of a PDSCH in a specific slot (s) by using the information when the UE is subjected to cross-slot scheduling from the base station. And more particularly, to a method and apparatus for analyzing PDSCH allocation information of a terminal that allows a base station to know a PDSCH start position in a slot (s) transmitted from a base station to a terminal based on CORESET of a received slot (s).

In order to find a time-frequency resource for PDSCH reception in the allocated time-frequency domain, the technical aspect of the present invention is that the base station allocates a start position of a PDSCH allocated in a specific slot (s) When a UE is scheduled to slot aggregation from a base station, the UE can know the start position of a PDSCH in a specific slot (s) using the corresponding information, Based on the CORESET configuration of the received slot (s), it is possible to know the PDSCH start position in the slot (s) transmitted from the base station to the UE, or to determine the PDSCH start position in the slot used in the slot for scheduling slot aggregation (S) to be scheduled at the time of slot aggregation from the base station, How to interpret the PDSCH allocation information of the terminal to know the starting position of the PDSCH in the end of the slot (s) sent to and to a device.

It will be understood by those skilled in the art that various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from the following detailed description of the invention, do.

According to the embodiment of the present invention, it is possible to reduce the DCI payload size, and the user terminal can increase PDSCH reception reliability by receiving the PDSCH at the correct position. Also, it is expected that the CORESET, which is used as a time and frequency resource that can be used for a control channel, can be changed according to the traffic or channel environment of the user, thereby increasing resource efficiency of the entire network.

1 shows an example of a radio frame structure used in a wireless communication system.
2 shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.
3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.
FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS).
5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
6 illustrates a configuration of a cell specific common reference signal.
FIG. 7 shows an example of a UL subframe structure used in a wireless communication system.
8 is a conceptual diagram illustrating a carrier aggregation (CA) technique.
FIG. 9 is a diagram for explaining Single Carrier Communication and Multiple Carrier Communication. FIG.
10 is a diagram showing an example in which a cross carrier scheduling technique is applied.
11 is a diagram illustrating a deployment scenario of a UE and a BS in an LTE and LAA service environment.
12 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.
13 is a diagram of a control region of a PDCCH for control channel transmission in LTE (-A).
Fig. 14- (a) is a diagram of a procedure for transmitting control information in LTE (-A).
FIG. 14- (b) is a diagram for CCE aggregation of PDCCH and multiplexing of PDCCH in LTE (-A).
FIG. 15 is a diagram showing a search space allocation by CCE aggregation for a common search space in the LTE (-A) and a UE specific (or terminal specific) search space.
16 is a diagram showing the CORESET of one cell.
17 is a diagram illustrating a PDSCH start position according to an embodiment of the present invention.
18 is a diagram illustrating a PDSCH start position according to an embodiment of the present invention.
19 is a diagram illustrating a PDSCH start position according to an embodiment of the present invention.
20 is a diagram illustrating a PDSCH start position according to an embodiment of the present invention.
21 is a diagram illustrating a PDSCH start position in a cross-slot scheduling according to an embodiment of the present invention.
FIG. 22 is a diagram illustrating a PDSCH start position in a slot aggregation-based scheduling according to an embodiment of the present invention.
FIG. 23 is a diagram illustrating a PDSCH start position in slot aggregation-based scheduling according to an embodiment of the present invention. FIG.
FIG. 24 is a diagram illustrating that resources allocated to a PDSCH and resources of a RESET overlap according to an embodiment of the present invention.
FIG. 25 is a diagram illustrating division of regions where PDSCH-allocated resources and RESET resources overlap, according to an embodiment of the present invention.
26 is a diagram illustrating the presence of a PDCCH in an area where a PDSCH allocated resource and a RESET resource overlap according to an embodiment of the present invention.
FIG. 27 is a diagram illustrating a PDSCH start position in a cross-slot scheduling according to an embodiment of the present invention. FIG.
FIG. 28 is a diagram illustrating a PDSCH start position in a slot aggregation-based scheduling according to an embodiment of the present invention. FIG.
FIG. 29 is a diagram illustrating a PDSCH start position in a slot aggregation-based scheduling according to an embodiment of the present invention. FIG.
30 is a diagram illustrating PDSCH allocation information when scheduling based on slot aggregation according to an embodiment of the present invention.
FIG. 31 shows configurations that a slot can have.
32 is a diagram showing the PDCCH scheduling PDSCH.
33 is a diagram illustrating the PDCCH scheduling PDSCH using two RIV values.
34 is a diagram illustrating scheduling of the PDSCH by jointly encoding two RIV values by the PDCCH.

As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention. However, these terms may vary depending on the intention of a person skilled in the art, custom or the emergence of new technology. Also, in certain cases, there may be a term arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in the description of the corresponding invention. Therefore, it is intended that the terminology used herein should be interpreted relative to the actual meaning of the term, rather than the nomenclature, and its content throughout the specification.

Throughout the specification, when a configuration is referred to as being "connected" to another configuration, it is not limited to the case where it is "directly connected," but also includes "electrically connected" do. Also, when an element is referred to as " including " a specific element, it is meant to include other elements, rather than excluding other elements, unless the context clearly dictates otherwise. In addition, the limitations of " above " or " below ", respectively, based on a specific threshold value may be appropriately replaced with "

FIG. 1 shows an example of a radio frame structure used in a wireless communication system.

Particularly, FIG. 1 (a) shows a frame structure for a frequency division duplex (FDD) used in a 3GPP LTE / LTE-A system and FIG. 1 Time division duplex (TDD) frame structure.

Referring to FIG. 1, a radio frame used in the 3GPP LTE / LTE-A system has a length of 10 ms (307200 Ts) and is composed of 10 equal sized subframes (SF). 10 subframes within one radio frame may be assigned respective numbers. Here, Ts represents the sampling time, and is represented by Ts = 1 / (2048 * 15 kHz). Each subframe is 1 ms long and consists of two slots. 20 slots in one radio frame can be sequentially numbered from 0 to 19. [ Each slot has a length of 0.5 ms. The time for transmitting one subframe is defined as a Transmission Time Interval (TTI). The time resource may be classified by a radio frame number (or a radio frame index), a subframe number (also referred to as a subframe number), a slot number (or a slot index), and the like.

The wireless frame may be configured differently according to the duplex mode. For example, in the FDD mode, since the downlink transmission and the uplink transmission are divided by frequency, the radio frame includes only one of the downlink subframe and the uplink subframe for a specific frequency band. In the TDD mode, since the downlink transmission and the uplink transmission are divided by time, the radio frame includes both the downlink subframe and the uplink subframe for a specific frequency band.

Table 1 illustrates the DL-UL configuration of subframes in a radio frame in TDD mode.

In Table 1, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe. The specific subframe includes three fields of Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and UpPTS (Uplink Pilot Time Slot). DwPTS is a time interval reserved for downlink transmission, and UpPTS is a time interval reserved for uplink transmission. Table 2 illustrates the configuration of the singular frames.

2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the structure of the resource grid of the 3GPP LTE / LTE-A system. There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in a time domain and a plurality of resource blocks (RB) in a frequency domain. The OFDM symbol also means one symbol period. Referring to FIG. 2, a signal transmitted in each slot may be expressed as a resource grid consisting of N ^{DL / UL} _RB * N ^RB _sc subcarriers and N ^{DL / UL} _symb OFDM symbols. have. Here, N ^DL _RB represents the number of resource blocks (RBs) in the downlink slot, and N ^UL _RB represents the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on the DL transmission bandwidth and the UL transmission bandwidth, respectively. N ^DL _symb denotes the number of OFDM symbols in the downlink slot, and N ^UL _symb denotes the number of OFDM symbols in the UL slot. N ^RB _sc represents the number of subcarriers constituting one RB. The OFDM symbol may be referred to as an OFDM symbol, an SC-FDM (Single Carrier Frequency Division Multiplexing) symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in one slot can be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot includes 7 OFDM symbols

In the case of an extended CP, one slot includes six OFDM symbols. Although FIG. 2 illustrates a subframe in which one slot is composed of seven OFDM symbols for convenience of description, embodiments of the present invention may be applied to subframes having a different number of OFDM symbols in a similar manner. Referring to FIG. 2, each OFDM symbol includes N ^{DL / UL} _RB * N ^RB _sc subcarriers in the frequency domain. The type of subcarrier may be a data subcarrier for data transmission, a reference signal subcarrier for transmission of a reference signal, a null subcarrier for a guard band or a direct current (DC) ≪ / RTI > The DC component is mapped to a carrier frequency (f ₀ ) in an OFDM signal generation process or a frequency up-conversion process. The carrier frequency is also referred to as the center frequency (f _c ).

One RB is defined as N ^{DL / UL} _symb consecutive OFDM symbols in the time domain (for example, seven), and N ^RB _scrambled (e.g., twelve) consecutive subcarriers in the frequency domain . For reference, a resource composed of one OFDM symbol and one subcarrier is referred to as a resource element (RE) or tone. Therefore, one RB consists of N ^{DL / UL} _symb * N ^RB _sc resource elements. Each resource element in the resource grid can be uniquely defined by an index pair (k, 1) in one slot. k is an index assigned from 0 to N ^{DL / UL} _RB * N ^RBsc -1 in the frequency domain, and 1 is an index assigned from 0 to N ^{DL / UL} _symb -1 in the time domain.

One RB is mapped to one physical resource block (PRB) and one virtual resource block (VRB). The PRB is defined as N ^{DL / UL} _symb (e.g., 7) consecutive OFDM symbols or SC-FDM symbols in the time domain, and N ^RB _scrambled (e.g., twelve) Is defined by the subcarrier. Therefore, one PRB consists of N ^{DL / UL} _symb * N ^RB _sc resource elements. Two RBs, one in each of two slots of the subframe occupying N ^RB _sc consecutive identical subcarriers in one subframe, are called a PRB pair. The two RBs constituting the PRB pair have the same PRB number (or PRB index).

In order for the UE to receive a signal from the eNB or to transmit a signal to the eNB, the time / frequency synchronization of the UE should be synchronized with the time / frequency synchronization of the eNB. since it can determine the time and frequency parameters necessary for the UE to perform the demodulation of the DL signal and the transmission of the UL signal at the correct time, as long as it is synchronized with the eNB.

3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.

The terminal performs an initial cell search operation such as synchronizing with a base station when power is increased or newly enters a cell (S301). To this end, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station and synchronizes with the base station and acquires information such as a cell ID have. Then, the terminal can receive the physical broadcast channel from the base station and acquire the in-cell broadcast information. Meanwhile, the UE can receive the downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.

Upon completion of the initial cell search, the UE receives more detailed system information by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) according to the information on the PDCCH (S302).

On the other hand, if the base station is initially connected or there is no radio resource for signal transmission, the terminal can perform a random access procedure (RACH) on the base station (steps S303 to S306). To this end, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) (S303 and S305), and receives a response message for the preamble on the PDCCH and the corresponding PDSCH S304 and S306). In case of the contention-based RACH, a contention resolution procedure can be additionally performed.

The UE having performed the procedure described above transmits PDCCH / PDSCH reception (S307) and physical uplink shared channel (PUSCH) / physical uplink control channel Control Channel, PUCCH) (S308). In particular, the UE receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the UE, and formats are different according to the purpose of use.

Meanwhile, the control information that the UE transmits to the base station through the uplink or receives from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI) ) And the like. In the case of the 3GPP LTE system, the UE can transmit control information such as CQI / PMI / RI as described above through PUSCH and / or PUCCH.

FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS). In particular, FIG. 4 illustrates a radio frame structure for transmission of a synchronous signal and a PBCH in a frequency division duplex (FDD). FIG. 4A illustrates a radio frame in a normal CP (normal cyclic prefix) SS and PBCH. FIG. 4 (b) shows transmission positions of SS and PBCH in a radio frame configured with an extended CP.

The UE obtains time and frequency synchronization with the cell when it is powered on or newly connected to the cell, and performs cell search such as detecting the physical cell identity N ^cell _ID of the cell cell search procedure. To this end, the UE receives a synchronization signal, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the eNB, synchronizes with the eNB, , ID) can be obtained.

Referring to FIG. 4, the SS will be described in more detail as follows. SS is divided into PSS and SSS. PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization, slot synchronization, and the like. SSS is used for frame synchronization, cell group ID, and / or cell CP configuration Information). Referring to FIG. 4, the PSS and the SSS are transmitted in two OFDM symbols of each radio frame, respectively. In order to facilitate inter Radio Access Technology ("RAT") measurement, the SS considers 4.6 ms, which is the Global System for Mobile communication (GSM) frame length, in the first slot of subframe 0 and the first slot of subframe 5 Respectively. Specifically, the PSS is transmitted in the last OFDM symbol of the first slot of the subframe 0 and the last OFDM symbol of the first slot of the subframe 5, respectively, and the SSS is transmitted from the second OFDM symbol at the end of the first slot of the subframe 0, Lt; RTI ID = 0.0 > OFDM < / RTI > The boundary of the corresponding radio frame can be detected through the SSS. The PSS is transmitted in the last OFDM symbol of the slot and the SSS is transmitted in the OFDM symbol immediately before the PSS. SS's transmit diversity scheme uses only a single antenna port and is not defined in the standard. That is, a single antenna port transmission or a UE transparent transmission scheme (e.g., Precoding Vector Switching (PVS), Time Switched Diversity (TSTD), Cyclic Delay Diversity (CDD)) can be used for SS transmission diversity .

The SS can represent a total of 504 unique physical layer cell IDs through a combination of three PSSs and 168 SSs. In other words, the physical layer cell IDs are allocated to 168 physical-layer cell-identifier groups, each group including three unique identifiers, such that each physical-layer cell ID is part of only one physical-layer cell- . Thus, the physical layer cell ID _{^{N cell ID = 3N (1)}} ID + N (2) ID is a physical-layer cell - the range of 0 [identifier group to the 167 number N ⁽¹⁾ _ID and the physical-layer cell - a unique number N ⁽²⁾ _ID of 0 to 2 indicating the physical-layer identifier in the identifier group. The UE may detect the PSS to know one of the three unique physical-layer identifiers and may detect the SSS to identify one of the 168 physical layer cell IDs associated with the physical-layer identifier. A ZC (Zadoff-Chu) sequence of length 63 is defined in the frequency domain and used as the PSS.

Referring to FIG. 4, since the PSS is transmitted every 5 ms, the UE can detect that the corresponding subframe is one of the subframe 0 and the subframe 5 by detecting the PSS. However, I do not know what it is. Therefore, the UE can not recognize the boundary of the radio frame only by the PSS. That is, frame synchronization can not be obtained with only PSS. The UE detects an SSS transmitted twice in one radio frame but transmitted as a different sequence and detects the boundary of the radio frame.

5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.

Referring to FIG. 5, a subframe is composed of 14 OFDM symbols. According to the subframe setting, the first to third OFDM symbols are used as a control region and the remaining 13 to 11 OFDM symbols are used as a data region. In the figure, R1 to R4 represent a reference signal (RS) or pilot signal for antennas 0 to 3. The RS is fixed in a constant pattern in the subframe regardless of the control region and the data region. The control channel is allocated to a resource to which the RS is not allocated in the control region, and the traffic channel is also allocated to the resource to which the RS is not allocated in the data region. Control channels allocated to the control region include a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid-ARQ Indicator CHannel (PHICH), and a Physical Downlink Control Channel (PDCCH).

The PCFICH informs the UE of the number of OFDM symbols used in the PDCCH for each subframe as a physical control format indicator channel. The PCFICH is located in the first OFDM symbol and is set prior to the PHICH and PDCCH. The PCFICH is composed of four REGs (Resource Element Groups), and each REG is distributed in the control area based on the cell ID (Cell IDentity). One REG is composed of four REs (Resource Elements). RE denotes a minimum physical resource defined by one subcarrier x one OFDM symbol. The PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).

The PHICH is used as a physical HARQ (Hybrid Automatic Repeat and Request) indicator channel to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted. The PHICH consists of one REG and is cell-specific scrambled. The ACK / NACK is indicated by 1 bit and is modulated by BPSK (Binary Phase Shift Keying). The modulated ACK / NACK is spread with a spreading factor (SF) = 2 or 4. A plurality of PHICHs mapped to the same resource constitute a PHICH group. The number of PHICHs multiplexed into the PHICH group is determined by the number of spreading codes. The PHICH (group) is repetitized three times to obtain the diversity gain in the frequency domain and / or the time domain.

The PDCCH is allocated to the first n OFDM symbols of the subframe as the physical downlink control channel. Here, n is an integer of 1 or more and is indicated by the PCFICH. The PDCCH consists of one or more CCEs. The PDCCH notifies each terminal or group of terminals of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information. A paging channel (PCH) and a downlink-shared channel (DLSCH) are transmitted on the PDSCH. Therefore, the BS and the MS generally transmit and receive data via the PDSCH, except for specific control information or specific service data.

PDSCH data is transmitted to a terminal (one or a plurality of terminals), and information on how the terminals receive and decode PDSCH data is included in the PDCCH and transmitted. For example, if a particular PDCCH is CRC masked with an RNTI (Radio Network Temporary Identity) of " A ", and a DCI format called " C " Assume that information on data to be transmitted using information (e.g., transport block size, modulation scheme, coding information, etc.) is transmitted through a specific subframe. In this case, the UE in the cell monitors the PDCCH using its RNTI information, and if there is more than one UE having the " A " RNTI, the UEs receive the PDCCH, B " and " C ".

FIG. 6 illustrates the configuration of a cell specific common reference signal. In particular, Figure 6 illustrates a CRS structure for a 3GPP LTE system supporting up to four antennas.

[Equation 1]

Where k is a subcarrier index, 1 is an OFDM symbol index, p is an antenna port number, and ^{Nmax and DL} _RB represent the largest downlink bandwidth configuration, expressed as an integer multiple of N ^RB _sc .

The variables v and v _shift define positions in the frequency domain for different RSs, and v is given by

&Quot; (2) "

Where n _s is the slot number in the radio frame and the cell specific frequency transition is given by:

&Quot; (3) "

Referring to FIG. 6 and Equations 1 and 2, the current 3GPP LTE / LTE-A standard defines a cell-specific CRS used for demodulation and channel measurement among the various RSs defined in the corresponding system, To be transmitted over the entire downlink band. Also, in the 3GPP LTE / LTE-A system, the cell-specific CRS is used for demodulation of the downlink data signal, and thus is transmitted every antenna port for downlink transmission.

Meanwhile, the cell-specific CRS can be used not only for channel state measurement and data demodulation, but also for tracking after the UE acquires time synchronization and frequency synchronization of a carrier used for communication with the UE, It is also used for tracking.

FIG. 7 shows an example of a UL subframe structure used in a wireless communication system.

Referring to FIG. 7, the UL subframe may be divided into a control domain and a data domain in the frequency domain. One or several physical uplink control channels (PUCCHs) may be assigned to the control region to carry uplink control information (UCI). One or several physical uplink shared channels (PUSCHs) may be allocated to the data area of the UL subframe to carry user data.

In the UL subframe, subcarriers far away from each other based on a DC (Direct Current) subcarrier are used as a control region. In other words, the subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of the UL control information. The DC subcarrier is a component that is left unused for signal transmission and is mapped to the carrier frequency f ₀ in the frequency up conversion process. In one subframe, the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency, and RBs belonging to the RB pair occupy different subcarriers in two slots. The PUCCH allocated as described above is expressed as the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, when frequency hopping is not applied, the RB pairs occupy the same subcarrier.

The PUCCH may be used to transmit the following control information.

- SR (Scheduling Request): Information used for requesting uplink UL-SCH resources. OOK (On-Off Keying) method.

- HARQ-ACK: A response to the PDCCH and / or a response to a downlink data packet (eg, codeword) on the PDSCH.

Indicates whether PDCCH or PDSCH has been successfully received. In response to a single downlink codeword, one bit of HARQACK is transmitted and two bits of HARQ-ACK are transmitted in response to two downlink codewords. The HARQ-ACK response includes positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission) or NACK / DTX. Here, the term HARQ-ACK is mixed with HARQ ACK / NACK and ACK / NACK.

- CSI (Channel State Information): Feedback information for the downlink channel. Multiple Input Multiple Output (MIMO) -related feedback information includes RI (Rank Indicator) and PMI (Precoding Matrix Indicator).

Hereinafter, a carrier aggregation technique will be described. 8 is a conceptual diagram illustrating carrier aggregation.

Carrier aggregation is a technique in which a radio communication system uses a frequency block or a (logical sense) cell composed of uplink resources (or component carriers) and / or downlink resources (or component carriers) Which is used as a single large logical frequency band. Hereinafter, the term "component carrier" is used for the convenience of description.

Referring to FIG. 8, the total system bandwidth (System BW) has a bandwidth of 100 MHz as a logical bandwidth. The total system bandwidth includes five component carriers, each of which has a bandwidth of up to 20 MHz. A component carrier comprises one or more contiguous subcarriers physically contiguous. In FIG. 8, each of the component carriers is shown to have the same bandwidth, but this is merely an example, and each component carrier may have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other in the frequency domain, this figure is shown in a logical concept, wherein each component carrier may physically be adjacent to or spaced from one another.

The center frequency may use different common carriers for each component carrier or common for physically contiguous component carriers. For example, assuming that all of the component carriers are physically adjacent in FIG. 8, the center carrier A can be used. Further, assuming that the respective component carriers are not physically adjacent to each other, the center carrier A, the center carrier B, and the like can be used separately for each component carrier.

In this specification, the component carrier may correspond to the system band of the legacy system. By defining a component carrier based on a legacy system, it is possible to provide backward compatibility and system design in a wireless communication environment in which an evolved terminal and a legacy terminal coexist. In one example, if the LTE-A system supports carrier aggregation, each component carrier may correspond to the system band of the LTE system. In this case, the component carrier may have any of the following bandwidths: 1.25, 2.5, 5, 10, or 20 Mhz.

The frequency band used for communication with each terminal when the entire system band is expanded by carrier aggregation is defined in units of component carriers. Terminal A can use 100 MHz, which is the entire system band, and performs communication using all five component carriers. The terminals B1 to B5 can use only a 20 MHz bandwidth and perform communication using one component carrier. Terminals C ₁ and C ₂ can use a 40 MHz bandwidth and each communicate using two component carriers. The two component carriers may be logically / physically adjacent or non-contiguous. The terminal C ₁ shows a case in which two non-adjacent component carriers are used and the terminal C ₂ shows a case in which two adjacent component carriers are used.

In the LTE system, one downlink component carrier and one uplink component carrier are used, while in the LTE-A system, a plurality of component carriers can be used as shown in FIG. A combination of a downlink component carrier or a corresponding downlink component carrier and a corresponding uplink component carrier may be referred to as a cell and a corresponding relationship between a downlink component carrier and an uplink component carrier may be indicated through system information .

At this time, the scheme of scheduling the data channel by the control channel may be classified into a link carrier scheduling method and a cross carrier scheduling method.

More specifically, link carrier scheduling schedules data channels only through the particular component carrier, such as existing LTE systems that use a single component carrier, over a particular component carrier. That is, the downlink grant / uplink grant transmitted to the PDCCH region of the downlink component carrier of a specific component carrier (or specific cell) can be scheduled only for the PDSCH / PUSCH of the cell to which the corresponding downlink component carrier belongs. That is, the search space, which is an area for attempting to detect the downlink grant / uplink grant, exists in the PDCCH region of the cell where the PDSCH / PUSCH to be scheduled is located.

On the other hand, in the cross carrier scheduling, when a control channel transmitted through a primary component carrier (Primary CC) using a Carrier Indicator Field (CIF) is transmitted through the main component carrier or through another component carrier Schedules the channel. In other words, a monitored cell (Monitored Cell or Monitored CC) of the cross-carrier scheduling is set, and the downlink grant / uplink grant transmitted in the PDCCH region of the monitored cell is set to PDSCH / PUSCH of a cell set to be scheduled in the corresponding cell Scheduling. That is, a search area for a plurality of component carriers is present in a PDCCH area of a cell to be monitored. Among the plurality of cells, system information is transmitted, an initial access attempt is made, and the PCell is set by transmission of uplink control information. The PCell is a downlink main component carrier and an uplink main component carrier corresponding to the downlink main component carrier .

9 is a diagram for explaining single carrier communication and multiple carrier communication. Particularly, FIG. 9A shows a subframe structure of a single carrier and FIG. 9B shows a subframe structure of multiple carriers.

Referring to FIG. 9A, a general wireless communication system performs data transmission or reception (in a frequency division duplex (FDD) mode) through one DL band and one UL band corresponding thereto , A radio frame is divided into an uplink time unit and a downlink time unit in a time domain and data transmission or reception is performed through an uplink / downlink time unit (time division duplex , TDD) mode). However, in recent wireless communication systems, introduction of a carrier aggregation technique using a larger UL / DL bandwidth by collecting a plurality of UL and / or DL frequency blocks in order to use a wider frequency band is being discussed. Carrier aggregation is an orthogonal frequency division multiplexing (OFDM) scheme that performs DL or UL communication by putting a fundamental frequency band divided into a plurality of orthogonal subcarriers on one carrier frequency in that DL or UL communication is performed using a plurality of carrier frequencies division multiplexing system. Hereinafter, each of the carriers collected by carrier aggregation is referred to as a component carrier (CC). Referring to FIG. 9 (b), three 20 MHz CCs can be grouped into UL and DL, respectively, so that a bandwidth of 60 MHz can be supported. Each CC may be adjacent or non-adjacent to one another in the frequency domain. FIG. 9B shows a case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetric, but the bandwidth of each CC can be determined independently. Asymmetric carrier aggregation in which the number of UL CCs is different from the number of DL CCs is also possible. A DL / UL CC specific to a particular UE may be referred to as a configured serving UL / DL CC in a particular UE.

The eNB may be used to communicate with the UE by activating some or all of the serving CCs configured in the UE, or by deactivating some CCs. The eNB can change the CC to be activated / deactivated, and can change the number of CCs to be activated / deactivated. When the eNB allocates a CC available for the UE in a cell-specific or UE-specific manner, at least one of the assigned CCs is used, as long as the CC allocation for the UE is not completely reconfigured or the UE does not perform a handover. One is not disabled. A CC that is not deactivated is referred to as a primary CC (PCC), and a CC that can be freely activated / deactivated by the eNB is called a secondary CC (SCC), unless it is a full reconfiguration of the CC assignment to the UE It is called. PCC and SCC may be distinguished based on control information. For example, specific control information may be set to be transmitted and received only via a specific CC, which may be referred to as PCC and the remaining CC (s) as SCC (s).

Meanwhile, 3GPP LTE (-A) uses the concept of a cell to manage radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CC and UL CC. A cell may consist of DL resources alone, or a combination of DL resources and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) . For example, a combination of a DL resource and a UL resource can be indicated by linkage of System Information Block Type 2 (SIB2). Here, the carrier frequency means a center frequency of each cell or CC. In the following,

a cell operating on a frequency is referred to as a primary cell or a PCC and a cell operating on a secondary frequency (or SCC) is referred to as a secondary cell (SCell) It is called. The carrier corresponding to PCell in the downlink is referred to as a downlink primary CC (DL PCC), and the carrier corresponding to PCell in the uplink is referred to as a UL primary CC (DL PCC). SCell refers to a cell that is configurable after a Radio Resource Control (RRC) connection is established and can be used to provide additional radio resources. Depending on the capabilities of the UE, a SCell may form together with the PCell a set of serving cells for the UE. The carrier corresponding to the SCell in the downlink is referred to as DL secondary CC (DL SCC), and the carrier corresponding to the SCell in the uplink is referred to as UL secondary CC (UL SCC)

do. For UEs that are in the RRC_CONNECTED state but no carrier aggregation is set or that do not support carrier aggregation, there is only one serving cell consisting of only PCell.

As previously mentioned, the term cell used in carrier aggregation is distinguished from the term cell, which refers to a geographical area in which a communication service is provided by a single eNB or a group of antennas. In order to distinguish between a cell designating a certain geographical area and a cell of carrier aggregation, a carrier aggregation cell is referred to as a CC and a cell in a geographical area is referred to as a cell. Quot;

In the existing LTE / LTE-A system, when multiple CCs are used together, it is assumed that the UL / DL frame time synchronization of the SCC coincides with the time synchronization of the PCC, assuming that the CCs that are not so far away in the frequency domain are clustered. However, there is a possibility that a plurality of CCs belonging to different frequency bands or spaced apart from each other in frequency, that is, a plurality of CCs having different propagation characteristics, may be gathered in the future. In this case, assuming that the time synchronization of the PCC and the time synchronization of the SCC are the same as in the conventional case, the synchronization of the DL / UL signal of the SCC may be seriously adversely affected.

Meanwhile, in the case of the LCT CC, among the radio resources operating in the LCT CC, radio resources available for transmission / reception of physical uplink / downlink channels and radio resources available for transmission / reception of physical uplink / The resources, as described above, are predetermined. In other words, the LCT CC is not configured to carry physical channels / signals through arbitrary time frequency in arbitrary time resources, but may be configured to transmit the physical channel / Signal should be configured to carry. For example, the physical downlink control channels may be configured only in the first OFDM symbol (s) of the OFDM symbols in the DL subframe, and the PDSCH may include the first OFDM symbol (s) that are likely to be mapped physical downlink control channels. Lt; / RTI > As another example, the CRS (s) corresponding to the antenna port (s) of the eNB are transmitted every subframe in the REs shown in Fig. 6 over the entire band regardless of the DL BW of the eNB. Accordingly, when the number of antenna ports of the eNB is 1, REs indicated by '0' in FIG. 6 are '0', '1', '2' and ' 3 'can not be used for other downlink signal transmission. In addition, there are various constraints on the composition of the LCT CC, and these constraints are greatly increased as the communication system develops. Some of these constraints arise because of the level of communication technology at the time the constraint is created, and there are some constraints that are unnecessary as communication technology develops, and constraints of existing and new technologies for the same purpose It may be present at the same time. As the constraints become so large, the constraints introduced for the development of the communication system are making the wireless resources of the CC ineffective. Therefore, the introduction of NCT CC, which can be constructed according to the simplified constraints rather than the existing constraints, is free from the constraints that are unnecessary according to the development of the communication technology. Since the NCT CC is not constructed according to the constraints of the existing system, it can not be recognized by the UE implemented according to the existing system. Hereinafter, UEs which are implemented according to the existing system and can not support NCT CC are called legacy UEs, and UEs implemented to support NCT CCs are called NCT UEs.

It is considered that NCT CC will be used as SCC in LTE-A system in the future. Since the NCT CC does not consider use by the legacy UE, the legacy UE does not need to perform cell search, cell selection, cell reselection, etc. in the NCT CC. If the NCT CC is not used as a PCC and the NCT CC is used only as an SCC, unnecessary constraints on the SCC can be reduced compared to an existing LCT CC that can be used as a PCC, enabling more efficient use of the CC. However, the time / frequency synchronization of the NCT CC may not coincide with the synchronization of the PCC. Even if the time / frequency synchronization of the NCT CC is obtained once, the time / frequency synchronization may be changed according to the change of the communication environment. An RS in which time synchronization and / or frequency synchronization can be used for tracking is required. An RS is also needed to allow the UE to detect the NCT CC in the neighbor cell search process. CRS can be used for purposes such as time / frequency synchronization of NCT CC and neighbor cell search using NCT CC. The CRS may be configured in the NCT CC in the same manner as in the existing LTE / LTE-A system shown in FIG. 6 and may have a smaller density in the time axis or frequency axis than the existing LTE / LTE- It may be configured in the NCT CC.

In the present invention, it is proposed that the CRS on the NCT CC is configured to have a lower density on the time axis than the CRS on the LCT CC of the existing LTE / LTE-A system. Accordingly, in the present invention, the NCT CC includes a constraint condition that the CRS is configured in the corresponding CC for every DL subframe, a constraint condition that the CRS is configured in the CC for each antenna port of the eNB, a predetermined number of OFDM It may not satisfy at least one of the constraint conditions that the symbol should be reserved for transmission of the control channel such as the PDCCH over the frequency band of the corresponding CC. For example, on the NCT CC, a CRS may be configured for every predetermined number (> 1) of subframes, not every subframe. Or, on the NCT CC, only the CRS for one antenna port (e.g., antenna port 0) can be configured regardless of the number of antenna ports of the eNB. The CRS of the present invention may not be used for data demodulation unlike the existing CRS shown in FIG. Therefore, instead of the existing CRS used for channel state measurement and demodulation, a tracking RS is newly defined for tracking of time synchronization and / or frequency synchronization, and the tracking RS is added to some subframes and / or some frequency resources on the NCT CC Lt; / RTI > Alternatively, the PDSCH may be configured in the leading OFDM symbols on the NCT CC, the PDCCH may be configured in the existing PDSCH region other than the initial OFDM symbols, or the PDCCH may be configured using some frequency resources. Hereinafter, unlike the existing LTE / LTE-A system, unlike the existing LTE / LTE-A system, the RSs transmitted in some subframes can be used in common by any UE regardless of the name, such as time synchronization and / or frequency synchronization of the NCT CC, RS (common RS, CRS).

10 is a diagram showing an example in which a cross carrier scheduling technique is applied. In particular, in FIG. 10, the number of allocated cells (or component carriers or component carriers) is three and the cross carrier scheduling technique is performed using CIF as described above. Here, it is assumed that the downlink cell # 0 is a downlink main component carrier (i.e., a primary cell, PCell) and the remaining component carriers # 1 and # 2 are subsidiary components (i.e., a secondary cell, SCell).

In the present invention, an effective management method of uplink resources for a main component carrier (primary component carrier, primary cell or PCell) or a subsidiary component carrier (secondary component carrier or secondary cell or SCell) during a carrier aggregation operation I suggest. Hereinafter, the case where the terminal operates by merging two component carriers is explained, but it is obvious that the present invention can also be applied to the case of merging three or more component carriers.

11 is a diagram illustrating a deployment scenario of a UE and a BS in an LTE and LAA service environment.

In the frequency band targeted by the LAA service environment, the wireless communication distance is not long due to the high frequency characteristics. In consideration of this, the deployment scenario between the terminal and the base station in the environment where the existing LTE-licensed service and the LAA service coexist is the overlay model shown on the left side of FIG. 11 and the overlay model shown in the right side of FIG. or a co-located model.

In the case of the overlay model shown in the left side of FIG. 11, the macro eNB performs wireless communication with the X terminal and the X 'terminal in the macro area 32 using a licensed carrier, and a plurality of RRHs and an X2 interface Lt; / RTI > Each RRH may perform wireless communication with an X terminal or an X 'terminal in a certain area 31 using an unlicensed carrier. In this case, there is no mutual interference between the macro eNB and the RRH. However, in order to use the LAA service as an auxiliary downlink channel of the LTE-licensed service through carrier aggregation, an X2 interface between the macro eNB and the RRH A fast data exchange should be made.

In the case of the co-located model shown on the right-hand side of FIG. 11, the pico / femto eNB can perform wireless communication with the Y terminal simultaneously using an authorized carrier and an unauthorized carrier. However, the use of the LTE service and the LAA service together is considered in the downlink data transmission. In this case, coverage for LTE service and coverage for LAA service may differ depending on frequency band, transmission power, and the like.

A terminal according to an embodiment of the present invention can be implemented by various types of wireless communication devices or computing devices that are guaranteed to be portable and mobility.

The base station according to the embodiment of the present invention controls and manages a cell (for example, a macro cell, a femtocell, a picocell, etc.) corresponding to a service area and transmits a signal, channel designation, channel monitoring, Can be performed.

12 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.

As shown, a terminal 100 according to an embodiment of the present invention may include a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150 have.

First, the processor 110 may execute various commands or programs, and may process data inside the terminal 100. [ In addition, the processor 100 can control the entire operation including each unit of the terminal 100, and can control data transmission / reception between the units.

Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards such as the cellular communication interface cards 121 and 122 and the wireless LAN interface card 123, either internally or externally. 12, the communication module 120 is shown as an integrated integrated module, but each network interface card may be independently arranged according to the circuit configuration or use, unlike in FIG.

The cellular communication interface card 121 according to the first frequency band transmits and receives a radio signal with at least one of the base station 200, the external device, and the server using the mobile communication network, Band cellular communication service. Here, the wireless signal may include various types of data or information such as a voice call signal, a video call signal, or a text / multimedia message.

According to an embodiment of the present invention, the cellular communication interface card 121 by the first frequency band may include at least one NIC module using the LTE-Licensed frequency band. According to an embodiment of the present invention, at least one NIC module performs cellular communication with at least one of the base station 200, the external device, and the server independently in accordance with the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module . The cellular communication interface card 121 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

The cellular communication interface card 122 in the second frequency band transmits and receives a radio signal to and from a base station 200, an external device, and a server using a mobile communication network, Band cellular communication service. According to an embodiment of the present invention, the cellular communication interface card 122 by the second frequency band may include at least one NIC module using the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band may be a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module performs cellular communication with at least one of the base station 200, the external device, and the server independently in accordance with the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module . The cellular communication interface card 122 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

The wireless LAN interface card 123 according to the second frequency band transmits and receives a radio signal to at least one of the base station 200, the external device, and the server through the wireless LAN connection, Band wireless LAN service. According to an embodiment of the present invention, the wireless LAN interface card 123 according to the second frequency band may include at least one NIC module using the wireless LAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module performs wireless communication with at least one of the base station 200, the external device, and the server independently in accordance with a wireless LAN standard or protocol of a frequency band supported by the corresponding NIC module . The wireless LAN interface card 123 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

According to an embodiment of the present invention, the processor 110 transmits information on whether or not the wireless LAN communication service of the second frequency band is available through the cellular communication channel of the first frequency band with the base station 200, Information on the period of time. Here, the information on the predetermined period is information set for receiving the downlink data from the base station 200 through the cellular communication channel of the second frequency band.

In addition, according to an embodiment of the present invention, since the base station 200 supports a wireless LAN communication service, the processor 110 can receive a predetermined signal from the base station 200 through a wireless LAN communication channel of a second frequency band And receives the base station coexistence message including information on the period.

In addition, according to an embodiment of the present invention, the processor 110 may be configured to transmit, in response to the received base station coexistence message, The terminal transmits a terminal coexistence message including information on a predetermined period according to a standard or protocol specified in the wireless LAN communication service of the second frequency band.

Also, according to an embodiment of the present invention, the processor 110 receives downlink data from the base station 200 for a predetermined period through a cellular communication channel of a second frequency band.

Next, the memory 130 stores a control program used in the terminal 100 and various data corresponding thereto. The control program may include a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200, the external device, and the server.

Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. In addition, the user interface 140 may perform output based on instructions of the processor 110 using various output means.

Next, the display unit 150 outputs various images on the display screen. The display unit 150 may output various display objects such as a content executed by the processor 110 or a user interface based on a control command of the processor 110. [

12, the base station 200 according to an exemplary embodiment of the present invention may include a processor 210, a communication module 220, and a memory 230. In addition,

First, the processor 210 may execute various commands or programs and may process data within the base station 200. In addition, the processor 210 can control the entire operation including each unit of the base station 200, and can control data transmission / reception between the units.

Next, the communication module 220 may be an integrated module for performing mobile communication using a mobile communication network and wireless LAN connection using a wireless LAN, such as the communication module 120 of the terminal 100 described above. To this end, the communication module 120 may include a plurality of network interface cards, such as the cellular communication interface cards 221 and 222 and the wireless LAN interface card 223, either internally or externally. 12, the communication module 220 is shown as an integrated integration module, but each network interface card may be independently arranged according to the circuit configuration or use, unlike in FIG.

The cellular communication interface card 221 according to the first frequency band transmits and receives a radio signal to at least one of the terminal 100, the external device, and the server using the mobile communication network, And provides cellular communication service by one frequency band. Here, the wireless signal may include various types of data or information such as a voice call signal, a video call signal, or a text / multimedia message.

According to an embodiment of the present invention, the cellular communication interface card 221 by the first frequency band may include at least one NIC module using the LTE-Licensed frequency band. According to an embodiment of the present invention, the at least one NIC module can perform cellular communication with at least one of the terminal 100, the external device, and the server independently according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module. Can be performed. The cellular communication interface card 221 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200.

The cellular communication interface card 222 according to the second frequency band transmits and receives a radio signal to at least one of the terminal 100, the external device, and the server using the mobile communication network, And provides a cellular communication service by two frequency bands. According to an embodiment of the present invention, the cellular communication interface card 222 by the second frequency band may include at least one NIC module using the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band may be a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, the at least one NIC module can perform cellular communication with at least one of the terminal 100, the external device, and the server independently according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module. Can be performed. The cellular communication interface card 222 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200. [

The wireless LAN interface card 223 according to the second frequency band transmits and receives a wireless signal to at least one of the terminal 100, the external device, and the server through the wireless LAN connection, 2 frequency band. According to an embodiment of the present invention, the wireless LAN interface card 223 according to the second frequency band may include at least one NIC module using the wireless LAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module independently communicates with at least one of the terminal 100, the external device, and the server in accordance with a wireless LAN standard or protocol of a frequency band supported by the corresponding NIC module Can be performed. The wireless LAN interface card 223 can operate only one NIC module at a time or operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200. [

According to an embodiment of the present invention, the processor 210 transmits information on whether or not the wireless LAN communication service of the second frequency band is available through the cellular communication channel of the first frequency band with the terminal 100, Information on the period of time. Here, the information on the predetermined period is information set for transmitting the downlink data to the terminal 100 through the cellular communication channel of the second frequency band.

In addition, according to an embodiment of the present invention, the processor 210 may be a peripheral terminal capable of communicating with the base station 200 through the terminal 100 and the wireless LAN communication service of the second frequency band, And transmits the base station coexistence message including information on a predetermined period according to a standard or protocol defined in the wireless LAN communication service to the terminal 100 for a predetermined period on the cellular communication channel of the second frequency band, .

In addition, according to an embodiment of the present invention, since the terminal 100 supports the wireless LAN communication service, the processor 210 transmits the base station coexistence message Lt; RTI ID = 0.0 > coexistence < / RTI > Here, the terminal coexistence message includes information on a predetermined period.

The terminal 100 and the base station 200 shown in FIG. 12 are block diagrams according to an embodiment of the present invention. Blocks that are separately displayed are logically distinguished from elements of a device. Thus, the elements of the device described above can be mounted as one chip or as a plurality of chips depending on the design of the device. In addition, in the embodiment of the present invention, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be optionally provided in the terminal 100. In addition, in the embodiment of the present invention, the user interface 140, the display unit 150, and the like may be additionally provided to the base station 200 as needed.

FIG. 13 shows a control region in which a PDCCH is transmitted in an LTE (-A) system. The control resign may be composed of 1 to 3 OFDM symbols (s) and may extend to 4 OFDM symbols when the system BW is 1.4 MHz. The PDCCH of the control region can be transmitted over 1 to 3 OFDM symbols (s) according to the size of the control region. And the PDCCH may be transmitted over the frequency axis or time axis within the control region.

Fig. 14- (a) relates to a procedure for control information and control channel transmission in LTE (-A). Each control information is subjected to rate matching according to the amount of resources (s) used for PDCCH transmission after attaching CRC according to the RNTI value according to the purpose and tailed biting convolutional coding. The PDCCHs (s) to be transmitted in a given subframe are multiplexed with PDCCHs using the CCE-based PDCCH structure to map resources to be transmitted. The number of CCEs used for one PDCCH is defined as the aggregation level. In LTE (-A), 1, 2, 4, and 8 can be used. FIG. 14- (b) is a diagram of CCE aggregation and multiplexing of a PDCCH, and shows a type of a CCE aggregation level used for one PDCCH and a CCE (s) transmitted in the corresponding control region.

15 is a diagram for setting up a PDCCH search space in the LTE (-A) system.

In order to transmit the PDCCH to the UE, at least one search space per UE may exist in the control region. In the present invention, the search space refers to all the time-space resource combinations to which the PDCCH of the UE can be transmitted, and includes a common search space common to all terminals of 3GPP LTE (-A) Specific or UE-specific search space to which a specific UE must search. The common search space is set to monitor a PDCCH that is set so that all terminals in a cell belonging to the same base station are commonly found. A specific terminal search space is defined as a PDCCH allocated to each terminal in search space positions However, the search space between the UEs may be partially overlapped due to the limited control region to which the PDCCH can be allocated.

16 is a diagram showing a CORESET to which a PDCCH in a 3GPP NR system can be transmitted.

CORESET is a time-frequency domain in which a PDCCH, which is a control signal of a UE, is transmitted. A search space set for transmitting a PDCCH to a UE can be mapped into a CORESET. That is, the UE can receive only the time-frequency domain defined by CORESET and decode the PDCCH mapped therein without receiving the entire frequency band and attempting PDCCH decoding. Referring to FIG. 16, there can be only one CORESET in a cell. Accordingly, all the UEs connected to the corresponding cell can perform PDCCH decoding by receiving one CORESET configured to the UE. Multiple CORESETs can exist in a cell. When there are multiple CORESETs in a cell, each terminal can be configured to monitor one or more CORESET (s). The CORESET (s) allocated to a UE can be configured to overlap with each other over time-frequency resources. The UE can know the time-frequency domain occupied by the CORESET (s) configured in the UE itself from the Node B in the current slot. However, the area of the time-frequency occupied by the CORESET (s) not configured for the UE from the base station by the current slot may be unknown or may be known through additional signaling. Also, the UE can not know the time-frequency resource occupied by the PDCCH (s) dynamically allocated to the CORESET (s) configured to itself in the future slot (s) from the base station.

Referring to FIG. 16, when a plurality of CORESETs are configured in a cell, the time domain lengths of the CORESETs may be different from each other. For example, in the nth slot, CORESET # 1 is composed of 2 OFDM symbol lengths, but in the nth slot, CORESET # 2 can be composed of 1 OFDM symbol length. The time domain length of these CORESETs may be determined according to the number of users monitoring the CORESETs and the link adaptation according to the channel environment of the users.

Referring to FIG. 16, when a plurality of CORESETs are configured in one cell, the number of PRBs occupied by each CORESET in the frequency domain may be different. For example, CORESET # 1 has X1 PRB (s), and CORESET # 2 can be configured to occupy X2 PRB (s) in the frequency domain. The frequency domain length of these CORESETs may be determined according to the number of users monitoring the CORESETs and the link adaptation according to the channel environment of their users.

PRBs other than the PRBs occupied by the CORESET (s) may be used as resources for the UE to receive the PDSCH. In order for the UE to know the boundary between the CORESET and the PDSCH, the UE can receive the position of the OFDM symbol, which the PDSCH starts from the Node B, through the DCI transmitted by the PDCCH for scheduling to the UE. If the possible PDSCH start positions are K, the CEIL (log ₂ K) bits are allocated in the DCI and the corresponding information can be set differently according to the PDSCH start position, and the UE can know the PDSCH start position through the value. The concrete value setting and PDSCH start position interpretation will be described later. For example, if the start position of the PDSCH is the fourth OFDM symbol in the first OFDM symbol (i.e., K = 4) and the start position of the PDSCH is the first OFDM symbol, the PDCCH of the PDCCH scheduling the '00' If the start position of the PDSCH is the second OFDM symbol, it can indicate '01' in the DCI of the PDCCH scheduling the PDSCH. If the start position of the PDSCH is the third OFDM symbol, the PDCCH 10 'in the DCI of the PDSCH and' 11 'in the DCI of the PDCCH scheduling the PDSCH if the start position of the PDSCH is the fourth OFDM symbol.

In one embodiment of the present invention, a UE can receive a PDSCH start OFDM symbol position from a BS through a DCI transmitted by a PDCCH for scheduling to a UE, Lt; / RTI > Referring to FIG. 17, the one PDSCH start position allocated through the DCI of the PDCCH to the UE can be determined according to the longest time domain length among the CORESET (s) overlapping the PRBs occupied by the allocated PDSCH. In other words, referring to FIG. 17, it is possible to indicate the start position of the PDSCH to the UE through the DCI of the PDCCH so that it does not overlap with the CORESET and the time and frequency resources based on the time and frequency resources of the CORESET configured through the RRC configuration . For reference, if there is no CORESET overlapping with the PRBs, which are frequency resources occupied by the PDSCH, the PDSCH start position may start from the first OFDM symbol. In other words, it is possible to transmit the PDSCH transmission from the first OFDM symbol to the frequency resource region not composed of CORESET. Referring to FIG. 17, since the PRBs occupied by the PDSCH overlap with CORESET # 1 but do not overlap with CORESET # 2, the start position of the PDSCH can be determined according to the time domain length of CORESET # 1. Since CORESET # 1 occupies two OFDM symbols, the PDSCH can start with the third OFDM symbol, and thus can indicate '10' on the PDCCH. Referring to FIG. 17, when a BS performs scheduling of a PDSCH, a region of a time frequency resource of one or more CORESETs (s) configured with RRC (i.e., CORESET # 1 in FIG. 17) When the PDSCH is completely or partially overlapped with the frequency domain, scheduling is performed to the UE by setting the next OFDM symbol position of the last OFDM symbol occupied by the CORESET # 1 at the start position of the corresponding PDSCH in the scheduling of the PDSCH. It is possible to receive the scheduled PDSCH from the base station from the next OFDM symbol position of the last OFDM symbol occupied by CORESET # 1 without expecting reception of the scheduled PDSCH in the OFDM symbol (s) occupied by the CORESET # 1.

Referring to FIG. 18, a UE can receive a PDSCH start OFDM symbol position through a DCI transmitted by a PDCCH for scheduling from a BS to a UE, PRBs other than the PRBs overlapping the PRBs overlap the CORESET (s) configured for the PDSCH from the PDSCH start OFDM symbol position pointed to by the DCI of the UE, and the PRBs overlapping the CORESET (s) The PDSCH can be received after the symbol. Referring to FIG. 18- (a), the one PDSCH start position is a position of a base station, among CORESETs that are overlapped with PRBs occupied by a PDSCH to be allocated to a UE, excluding CORESET The base station can designate the terminal according to the time domain length of the longest CORESET. That is, referring to FIG. 18- (a), when CORESET # 1 is configured in the UE, the BS determines the CORESET # 2 time period occupying the longest time period among the CORESETs not configured in the UE, The start position of the PDSCH may be designated as the second OFDM symbol. The UE performs PDSCH reception on the assumption that the PDSCH is being transmitted from the start OFDM symbol position of the PDSCH indicated by the base station. However, in the case of the UE, CORESET, i.e., CORESET # 1 it is possible to receive the PDSCH on the assumption that the PDSCH is not allocated for the overlapped time frequency resource, in other words, receive the PDSCH only for the time frequency resource that does not overlap with the CORESET # 1. As shown in FIG. 18- (b), if the BS does not have the CORESET (s) configured for itself among the CORESET (s) overlapping with the PRBs occupied by the PDSCH to be allocated to the UE, You can start with a symbol. Referring to FIG. 18- (b), the PRBs occupied by the PDSCH overlap with CORESET # 1 but do not overlap with CORESET # 2, and may start from the first OFDM symbol when only CORESET # 1 is set to CORESET configured to itself. Therefore, the PDCCH can indicate '00'.

In one embodiment of the present invention, a UE can receive a PDSCH start OFDM symbol position through a DCI transmitted by a PDCCH for scheduling from a Node B to a UE, (Or CCE (s)) received from the PDSCH from all the PRBs on the assigned frequency resource from the start OFDM symbol position and actually used PDCCH as the PDCCH to be transmitted from the actual BS to the corresponding UE in the CORESET configured for the UE the UE can receive the entire PDSCH by rate matching or puncturing.

20, a UE can receive a PDSCH start OFDM symbol position through a DCI transmitted by a PDCCH for scheduling from a BS to a UE, and the PDSCH is scheduled to a CORESET And the PDSCH start position of the PRBs in which the PDSCH overlaps with the scheduled CORESET is received as the first OFDM symbol and the PDSCH is received in the CORESET configured in the UE, The UE can receive the entire PDSCH by rate-matching or puncturing the actually used PRBs (or CCE (s)) as the PDCCH to be transmitted to the UE.

In one embodiment of the present invention, in addition to the method of indicating one PDSCH start position described with reference to FIGs. 19 and 20, among the CORESET (s) configured in itself, the remaining CORESET excluding the CORESET to which the PDCCH is mapped, The PDSCH start position in the time and frequency domain can be set to the next OFDM symbol of the last OFDM symbol occupied by each CORESET (s). At this time, the UE assumes the transmission of the PDSCH from the base station from the corresponding OFDM symbol position And receive the PDSCH.

In an exemplary embodiment of the present invention, a UE can receive N PDSCH start OFDM symbol positions through a DCI transmitted by a PDCCH for scheduling to a UE from a BS, and receive PDSCHs from start OFDM symbol positions have. Where N is a natural number greater than one. The PRBs indicated by the PDSCH start OFDM symbol positions can be determined according to the N value and the M value, which is the number of PRBs occupied by the allocated PDSCH. More specifically, when the indexes of the PRBs occupied by the PDSCH are assumed to be 0,1, ..., M-1 for convenience, each of the N PDSCH start OFDM symbol positions is m consecutive PRBs among the PRBs occupied by the PDSCH { 1, ..., m-1}, {m, m + 1, ..., 2m-1}, ..., , {(N-1) * m, ..., M-1}. Where m is the largest natural number less than or equal to M / N. The starting position of each m consecutive PRBs may be determined according to the longest time-domain length of the CORESET (s) that overlaps the PRBs. For reference, the start position of the m consecutive PRBs may start from the first OFDM symbol if there is no CORESET overlapping the PRBs.

In an exemplary embodiment of the present invention, a UE may receive N PDSCH start OFDM symbol positions through a DCI transmitted by a PDCCH for scheduling from a BS to a UE, and receive a PDSCH from start OFDM symbol positions thereof , And can receive the PDCCH allocated thereto by rate-matching or puncturing. Where N is a natural number greater than one. The PRBs indicated by the PDSCH start OFDM symbol positions can be determined according to the N value and the M value, which is the number of PRBs occupied by the allocated PDSCH. More specifically, when the index of the PRBs occupied by the PDSCH is assumed to be 0,1, ..., M-1 for convenience, each of the N PDSCH start positions includes m consecutive PRBs {0, 1, ..., m-1}, {m, m + 1, ..., 2m-1}, ... , {(N-1) * m, ..., M-1}. Where m is the largest natural number less than or equal to M / N. The starting position of each m consecutive PRBs may be determined according to the CORESET (s) overlapping the PRBs or the PDCCHs mapped to the CORESET (s). For reference, the start position of the m consecutive PRBs may start from the first OFDM symbol if there is no CORESET overlapping the PRBs.

In one embodiment of the present invention, a UE can receive N PDSCH start OFDM symbol positions through a DCI transmitted by a PDCCH for scheduling from a Node B to a UE, and can receive a frequency of a CORESET (s) and a PDSCH In case of overlapping resources, the remaining PRBs except the overlapping PRBs receive the PDSCH from their starting OFDM symbol positions indicated from the base station, and if the frequency resources of the CORESET (s) configured to them overlap with the frequency resources of the PDSCH, The PDSCH can be received from the next OFDM symbol of the last OFDM symbol occupied by the PDSCH. Where N is a natural number greater than one. The PRBs excluding the PRBs overlapping with the CORESET (s) configured for the UE according to the N value and the L value, which is the number of PRBs that do not overlap with the CORESET (s) configured for the scheduling PDSCH, can determine their start positions have. More specifically, when the index of the frequency resources occupied by the PDSCH and the PRESs that do not overlap with the CORESET (s) configured for the UE among the PRBs is 0, 1, ..., L-1 for convenience, each of the N PDSCH start positions the PRB s of l consecutive PRB in {0,1, ..., l -1} , {l, l + 1, ..., 2l-1}, ... , {(N-1) * l, ..., L-1}. Where l is the largest natural number less than or equal to L / N. Can be determined according to the respective l of the starting position of the consecutive PRB is mapped to a PRB in the overlaps CORESET (s) or the CORESET (s) PDCCH .. Note that in the starting position of the l consecutive PRB If there is no CORESET overlapping the PRBs, then the first OFDM symbol can start.

In an embodiment of the present invention, a UE can receive N PDSCH start OFDM symbol positions through a DCI transmitted by a PDCCH for scheduling to a UE from a Node B, and the frequency resources of PDCCH and PDSCH allocated to the UE can be indicated In case of overlapping, the PRBs other than the overlapping PRBs receive the PDSCH from their starting positions indicated by the base station, and if the PDCCH and the frequency resources of the PDSCH are overlapped, the overlapping PRBs are transmitted from the PDSCH after the next OFDM symbol, Lt; / RTI > Where N is a natural number greater than one. The PRBs excluding the PRBs overlapping the PDCCH configured with the PDCCH according to the N value and the L value, which is the number of PRBs that do not overlap with the PDCCH configured for the scheduling PDSCH, can determine their start positions. More specifically, when the index of the frequency resource occupied by the PDSCH and the PRBs that do not overlap with the PDCCH configured for the PRB among the PRBs is 0, 1, ..., T-1 for convenience, N PDSCH start positions, 1, ..., t-1}, {t, t + 1, ..., 2t-1}, ..., t consecutive PRBs , {(N-1) * t, ..., T-1}. Where t is the largest natural number less than or equal to L / N. The starting position of each t consecutive PRBs may be determined according to the CORESET (s) overlapping the PRBs or the PDCCHs mapped to the CORESET (s). For reference, the start position of the t consecutive PRBs may start from the first OFDM symbol if there is no CORESET overlapping the PRBs.

In the 3GPP NR system, a PDCCH for scheduling a PDSCH to a user and the scheduled PDSCH can be transmitted in different slots. This scheduling scheme is called cross-slot scheduling. For example, the PDCCH mapped to the CORESET of the nth slot can schedule the PDSCH of the (n + k) th slot. At this time, k is a natural number larger than 1. Since the time-frequency resources occupied by the PDCCH (s) mapped to the configured CORESETs may change from slot to slot, the time-frequency resource available for the PDSCH in the future slot is unknown at the time of the PDCCH transmission in the cross- Can occur. Another problem addressed by the present invention is to indicate the start OFDM symbol position of the PDSCH at the time of cross-slot scheduling.

In an embodiment of the present invention, when the PDSCH is scheduled from the base station to the mobile station in the cross-slot scheduling, the starting OFDM symbol position of the PDSCH can always be fixed to start from a specific OFDM symbol, with reference to FIG. The starting OFDM symbol position of the PDSCH can be determined by the number of OFDM symbols that the CORESETS can occupy to the maximum. The UE sets the start position of the PDSCH with the maximum OFDM symbol length occupied by the CORESETs configured in the UE so as to know the start OFDM symbol position of the cross-slot scheduled PDSCH according to the fixed value, and performs reception of the PDSCH from the symbol position.

In one embodiment of the present invention, when the PDSCH is scheduled from the base station to the mobile station in the cross-slot scheduling, the starting OFDM symbol position of the PDSCH can always be fixed to start from a specific OFDM symbol, with reference to FIG. The start OFDM symbol position of the PDSCH can be informed to the UE by the RRC signal or periodically transmitted System information value to the UE and the UE can know the start OFDM symbol position of the PDSCH that is cross-slot scheduled according to the received value. The starting OFDM symbol position to be informed may be informed for each PRB or several consecutive PRBs of the cell and may be known according to the PRBs of the cross-slot scheduled PDSCH. Alternatively, the starting OFDM symbol of the informing PDSCH may inform a common value to all the PRBs of the cell, and the starting OFDM symbol position of the cross-slot scheduled PDSCH may be always started from one known value .

In an embodiment of the present invention, when a PDSCH is scheduled from a base station to a mobile station by cross-slot scheduling, the mobile station indicates a position of one PDSCH start OFDM symbol through a DCI transmitted by a PDCCH for scheduling from the base station to the mobile station And can receive the PDSCH from its starting OFDM symbol location.

In an embodiment of the present invention, when a PDSCH is scheduled from a base station to a mobile station by cross-slot scheduling, the mobile station indicates a position of one PDSCH start OFDM symbol through a DCI transmitted by a PDCCH for scheduling from the base station to the mobile station PRBs other than the PRESs overlapping with the CORESET (s) configured to themselves receive the PDSCH from its starting OFDM symbol position, and the PRBs overlapping with the CORESET (s) configured to it are allocated to the next OFDM PDSCH can be received after the symbol.

In an embodiment of the present invention, when a PDSCH is scheduled from a base station to a mobile station in a cross-slot scheduling, the mobile station indicates N PDSCH start OFDM symbol positions through a DCI transmitted by a PDCCH for scheduling from the base station And may receive the PDSCH from its starting OFDM symbol positions. Where N is a natural number greater than one. The PRBs indicated by the PDSCH start positions can be determined according to the N value and the M value, which is the number of PRBs occupied by the allocated PDSCH. More specifically, when the indexes of the PRBs occupied by the PDSCH are assumed to be 0,1, ..., M-1 for convenience, each of the N PDSCH start OFDM symbol positions is m consecutive PRBs among the PRBs occupied by the PDSCH { 1, ..., m-1}, {m, m + 1, ..., 2m-1}, ..., , {(N-1) * m, ..., M-1}. Where m is the largest natural number less than or equal to M / N. The starting position of each m consecutive PRBs may be determined according to the longest time-domain length of the CORESET (s) that overlaps the PRBs. For reference, the start position of the m consecutive PRBs may start from the first OFDM symbol if there is no CORESET overlapping the PRBs.

In an embodiment of the present invention, when a PDSCH is scheduled from a base station to a mobile station by cross-slot scheduling, the mobile station receives N PDSCH start positions through a DCI transmitted by a PDCCH for scheduling from the base station to the mobile station PRBs other than the PRESs overlapping with the CORESET (s) constituting it receive the PDSCH from their starting position OFDM symbols, and the PRBs overlapping with the CORESET (s) configured to it are allocated to the next OFDM symbol PDSCH can be received thereafter. Where N is a natural number greater than one. The PRBs excluding the PRBs overlapping with the CORESET (s) configured for the UE according to the N value and the L value, which is the number of PRBs that do not overlap with the CORESET (s) configured for the scheduling PDSCH, can determine their start positions have. More specifically, when the index of PRBs that do not overlap with the CORESET (s) configured for the PRS occupied by the PDSCH is 0, 1, ..., L-1 for convenience, N PDSCH start positions are allocated to the PRBs of l consecutive PRB in {0,1, ..., l -1} , {l, l + 1, ..., 2l-1}, ... , {(N-1) * l, ..., L-1}. Where l is the largest natural number less than or equal to L / N. Can be determined according to the respective l of the starting position of the consecutive PRB is mapped to a PRB in the overlaps CORESET (s) or the CORESET (s) PDCCH .. Note that in the starting position of the l consecutive PRB If there is no CORESET overlapping the PRBs, then the first OFDM symbol can start.

In the 3GPP NR system, one PDCCH can schedule a PDSCH in a plurality of slots. This scheduling scheme is called slot aggregation-based scheduling. For example, the PDCCH mapped to the CORESET of the nth slot can schedule the PDSCH to slots n, n + 1, ..., n + k. At this time, k is a natural number larger than 1. Since the time-frequency resources occupied by the PDCCHs mapped to CORESET may change from slot to slot, when the PDCCH is transmitted during slot aggregation-based scheduling, the start position of the PDSCH allocated to the slot (s) An unknown situation may occur. Another problem addressed by the present invention is to inform the start location of the PDSCH when scheduling based on slot aggregation.

In an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a start OFDM symbol position of a PDSCH of each slot can always be fixed to start from a specific OFDM symbol. The starting OFDM symbol position can be determined by the number of OFDM symbols that the CORESETs can occupy to the maximum. The UE can know the starting OFDM symbol position of the slot aggregation-based scheduled PDSCH in each slot according to the fixed value.

According to an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station by slot aggregation-based scheduling, a start OFDM symbol position of a PDSCH of each slot can be fixed to start from a specific OFDM symbol. The starting OFDM symbol position can be informed to the UE by the RRC signal or periodically transmitted System information value, and the UE can know the starting OFDM symbol position of the slot aggregation-based scheduled PDSCH according to the received value. The starting OFDM symbol position to be informed may be indicated for each PRB or several consecutive PRBs of the cell and the starting OFDM symbol position may be known according to the PRBs of the slot aggregation based scheduling PDSCH. Alternatively, the indicating start position can inform a single value to all the PRBs of the cell, and the starting OFDM symbol position of the slot aggregation-based scheduled PDSCH can always start from one known value.

In an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station through slot aggregation-based scheduling, the mobile station transmits a DCI transmitted by the PDCCH for scheduling from the base station to the mobile station It is possible to receive one PDSCH start OFDM symbol position and receive the PDSCH using the start OFDM symbol position information every slot. In other words, in FIG. 22, if the PDSCH starting OFDM symbol position in the nth slot is the third OFDM symbol, the PDSCH starting OFDM symbol position in the (n + 1) th slot is also the third OFDM symbol.

Referring to FIG. 23, when a PDSCH is scheduled to a plurality of slots from a base station through a slot aggregation-based scheduling, the UE transmits a DCI transmitted by the PDCCH for scheduling to the UE from the BS, A slot where the PDCCH is scheduled can receive the PDSCH from the indicated starting OFDM symbol position, and then the PDSCH starting OFDM symbol position of the slots can be fixed. The fixed start OFDM symbol position in the slot (s) scheduled for slot aggregation from the base station can be determined by the number of OFDM symbols for which CORESETs can occupy the maximum. In other words, in FIG. 23, when the maximum CORESET length of the cell is two OFDM symbols, the starting OFDM symbol position of the PDSCH in the (n + 1) th slot can start from the third OFDM which is after the maximum length 2 of the CORESET.

According to an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a mobile station transmits a PDSCH start OFDM through a DCI transmitted by a PDCCH for scheduling to a mobile station symbol positions can be indicated, and the slot on which the PDCCH is scheduled can receive the PDSCH from the indicated starting OFDM symbol position, and then the PDSCH starting OFDM symbol position of the slots can be fixed. The fixed start OFDM symbol position in the slot (s) scheduled for slot aggregation at the time of slot aggregation from the base station can be informed to the UE by the RRC signal or periodically transmitted System information value. The starting OFDM symbol position to be informed may be indicated for each PRB or several consecutive PRBs of the cell and the starting OFDM symbol position may be known according to the PRBs of the slot aggregation based scheduling PDSCH. Alternatively, the starting OFDM symbol position may inform a common value to all the PRBs of the cell.

According to an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a mobile station transmits a PDSCH start OFDM through a DCI transmitted by a PDCCH for scheduling to a mobile station symbol positions, PRBs except for PRBs overlapping with CORESET (s) configured for themselves in each slot, receive the PDSCH from its starting OFDM symbol position, and PRBs overlapping with the CORESET (s) The PDSCH can be received from the next OFDM symbol after the end of the PDSCH.

In an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, the UE transmits N PDSCH start OFDM symbols through a DCI transmitted by a PDCCH for scheduling from a base station symbol positions, and receive a PDSCH from its starting OFDM symbol positions every slot. Where N is a natural number greater than one. The PRBs indicated by the PDSCH start OFDM symbol positions can be determined according to the N value and the M value, which is the number of PRBs occupied by the allocated PDSCH. More specifically, when the index of the PRBs occupied by the PDSCH is assumed to be 0,1, ..., M-1 for convenience, each of the N PDSCH start positions includes m consecutive PRBs {0, 1, ..., m-1}, {m, m + 1, ..., 2m-1}, ... , {(N-1) * m, ..., M-1}. Where m is the largest natural number less than or equal to M / N. The starting OFDM symbol position of each m consecutive PRBs may be determined according to the longest time domain length of the CORESET (s) that overlaps the PRBs. For reference, the start OFDM symbol position of the m consecutive PRBs may start from the first OFDM symbol if there is no CORESET overlapping the PRBs.

In an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, the UE transmits N PDSCH start OFDM symbols through a DCI transmitted by a PDCCH for scheduling from a base station symbol positions, PRBs except for PRBs overlapping CORESET (s) configured for themselves in each slot, receive the PDSCH from their starting OFDM symbol positions, and PRBs overlapping with the CORESET (s) configured to themselves are configured The PDSCH can be received from the next OFDM symbol after CORESET (s) ends. Where N is a natural number greater than one. The PRBs excluding the PRBs overlapping with the CORESET (s) configured for itself according to the L value, which is the number of PRBs that do not overlap with the CORESET (s) configured for the scheduling PDSCH occupied by the scheduled PDSCH, You can decide. More specifically, when the index of PRBs that do not overlap with the CORESET (s) configured for the PRS occupied by the PDSCH is 0,1, ..., L-1 for convenience, the N PDSCH start OFDM symbol positions 1 consecutive PRBs {0,1, ..., l- 1}, {l, l + 1, ..., 2l-1}, ... , {(N-1) * l, ..., L-1}. Where l is the largest natural number less than or equal to L / N. Start of each of l consecutive PRB OFDM symbol position may be determined in accordance with the PDCCH map to the PRB and overlapping CORESET (s) or the CORESET (s). Note the start of l consecutive PRB in OFDM The symbol position can start from the first OFDM symbol if there is no CORESET overlapping the PRBs.

In order to use the resource allocated to the CORESET described above as the PDSCH, the Node B can notify the UE of one or more RESETs (Resource Sets) through the RRC signal, and determine whether the RESET (s) L1 signaling or downlink control information (DCI). At this time, the base station can inform the UE of the length of the bit-field for indicating whether the RESET (s) can be used as the PDSCH through the RRC signal through the downlink control information (DCI). A specific indication method using downlink control information (DCI) and a method of analyzing a terminal will be described later. The RESET (s) may include CORESET (s) in whole or part, CORESET (s) units, or multiple CORESET (s) units. Also, RESET (s) may be the same as CORESET (s). In the above description of the present invention, CORESET can be explained by substituting RESET. In the following description, it is assumed that RESET is replaced with CORESET, and that the base station informs the UE of RESET (s) (or CORESET (s) when it is replaced with CORESET) through RRC configuration.

In a preferred embodiment of the present invention, when information on available RESET (s) is transmitted to the downlink control information (DCI), the information is transmitted according to the PDSCH resource allocation information indicated in the downlink control information (DCI) Can be interpreted as information on availability of time-frequency resources and overlapping portions of time-frequency resources occupied by RESET (s). Specifically, in the downlink control information DCI, the UE operates when a signal indicating whether to allocate the time-frequency resource indicated by RESET (s) to the PDSCH is included. The UE transmits time domain resource allocation information (i.e., which OFDM symbol is assigned to the PDSCH, i.e., the PDSCH start OFDM symbol position and the end OFDM symbol, through the downlink control information DCI transmitted by the PDCCH for scheduling from the base station to the UE. Symbol) and frequency domain resource allocation information (which PRB is allocated to the PDSCH). At this time, the downlink control information DCI may include an N bit-field as information on whether the time-frequency resource indicated by RESET (s) can be allocated to the PDSCH. The N bit-field may be configured by the base station as an RRC to the UE. The UE uses the time-frequency resource allocation information indicated by the DCI to obtain a time-frequency resource for which the PDSCH can be scheduled. Not all resources of the time-frequency resource are used as a PDSCH but a value of an N bit-field indicating information on allocation of a time-frequency resource indicated by a RESET (s) indicated by the DCI to a PDSCH The time-frequency resource actually used for the PDSCH is determined. The UE obtains a time-frequency resource region in which the PDSCH can be scheduled and a time-frequency resource region overlapping a RESET (s) informed by the RRC using the time-frequency resource allocation information indicated in the downlink control information (DCI). This area can be called Overlapped-RESET. If there is no Overlapped-RESET, the UE can determine that the PDSCH is allocated to all the time-frequency resources for which the PDSCH can be scheduled, regardless of the value mapped to the N bit-field. Overlapped-RESET is present, and Overlapped-RESET can be divided into N Sub-Overlapped-RESET (s). The method of dividing will be described later in detail. N sub-overlapped-RESET (s) can determine whether it can be used as a PDSCH according to the N bit-field. Referring to FIG. 24 (a), when the DCI schedules the PDSCH from the first OFDM symbol to the 14th OFDM symbol (or an OFDM symbol used as a DL in the slot) on the time axis and schedules the specific PRBs on the frequency axis, -RESET can be a shaded area. Referring to FIG. 24 (b), when the DCI schedules the PDSCH from the second OFDM symbol to the 14th OFDM symbol (or an OFDM symbol used as a DL in the slot) on the time axis and schedules the specific PRBs on the frequency axis, RESET can be a shaded area. Referring to FIG. 24 (c), when the DCI schedules the PDSCH from the first OFDM symbol to the 14th OFDM symbol (or an OFDM symbol used as a DL in the slot) on the time axis and schedules the specific PRBs on the frequency axis, RESET can be a shaded area. Referring to FIGS. 24A and 24B, when a plurality of RESETs are configured in the UE, the time-frequency domain occupied by the PDSCH indicated by the DCI to the UE can overlap with one RESET. In this case, the overlapped area is one Overlapped-RESET. Referring to FIG. 24 (c), when a plurality of RESETs are configured in the UE, the time-frequency region occupied by the PDSCH indicated by the DCI to the UE may overlap with two or more RESETs. In this case, the UE can judge that each overlapping area is each Overlapped-RESET, and the overlapping areas can be grouped together to determine that it is one Overlapped-RESET. The shaded Overlapped-RESET (s) can be divided into N Sub-Overlapped-RESET (s), and whether each Sub-Overlapped-RESET can be used as a PDSCH can be determined according to each bit.

If there is only one Overlapped-RESET, the Overlapped-RESET can be made into N Sub-Overlapped-RESETs, and each Sub-Overlapped-RESETs can be used as PDSCH by N bit size bit field transmitted from DCI. Can be determined. If there are more than two Overlapped-RESETs and the number is greater than N, the number of Sub-Overlapped-RESETs divided for each Overlapped-RESETs can be determined to divide each Overlapped-RESETs into Sub-Overlapped-RESETs. Conversely, if there are two or more Overlapped-RESETs and the number is less than N, some Overlapped-RESETs may be combined into one Sub-Overlapped-RESET. If there are two or more Overlapped-RESETs and the number is equal to N, each Overlapped-RESETdl may be a Sub-Overlapped-RESET. As a result, the UE can classify all Overlapped-RESET (s) into N sub-overlapped RESETs, and it is determined whether each Sub-Overlapped-RESET can be used as a PDSCH by an N-bit size bit field transmitted from the DCI .

25 (a)), a method of dividing one Overlapped-RESET according to a frequency domain (FIG. 25 (b), FIG. 25 25 (d)), and a method of dividing according to the time-frequency domain (Fig. 25 (c), 25 (e)). In the above example, Overlapped-RESET (s) is shown as a rectangle, but this is an example but not a limitation. Where M is the number of resources not greater than N. The method of dividing according to the time domain is a method of dividing up to M sub-optimal-RESET (s) based on the OFDM symbol occupied by Overlapped-RESET. The method of dividing according to time frequency domain is a method of dividing up to M sub-overlapped-RESET (s) based on OFDM symbol occupied by Overlapped-RESET and PRBs. When divided into the frequency domain, Sub-Ovelapped-RESET (s) may consist of consecutive PRBs or be distributed. In the above dividing method, if a plurality of RESETs are included in the Overlapped RESET, a plurality of RESETs can be preferentially divided first. The above-described dividing method may be one embodiment, and it is not excluded to divide it by other methods.

The method of dividing according to the frequency domain is a method of dividing up to M sub-overlapped-RESET (s) based on the PRBs occupied by Overlapped-RESET. For example, when Overlapped-RESET occupies X PRBs, M-1 Sub-Overlapped-RESET (s) occupies floor (X / M) PRBs and 1 Sub- (M-1) * floor (X / M) PRBs. Here, floor (x) represents the largest natural number of numbers less than or equal to x.

In yet another embodiment, the base station allocates PDSCH allocated frequency resources based on the PDSCH frequency allocation resource allocated by the base station, irrespective of the overlapped-RESET (s), based on the N bit- to a method of 2 gave ^N pieces, the resource is divided pieces 2 ^N to instructions from the L1 signaling or the DCI if I can be assigned to the PDSCH and receives the a terminal to determine if the PDSCH is assigned to the zone from the base station to be used have.

In an embodiment of the present invention, when configuring the overlay RESET, the UE may exclude from the Overlapped-RESET in which the UE successfully received the PDCCH mapped, and the PRBs mapped with the PDCCH CCE (s)) by rate-matching or puncturing the PDSCH.

In the 3GPP NR system, a PDCCH for scheduling a PDSCH to a user and the scheduled PDSCH can be transmitted in different slots. This scheduling scheme is called cross-slot scheduling. For example, the PDCCH mapped to the CORESET of the nth slot can schedule the PDSCH of the (n + k) th slot. At this time, k is a natural number larger than 1. Since the time-frequency resources occupied by the PDCCH (s) mapped to the configured CORESETs may change from slot to slot, the time-frequency resource available for the PDSCH in the future slot is unknown at the time of the PDCCH transmission in the cross- Can occur. Another problem addressed by the present invention is to indicate the start OFDM symbol position of the PDSCH at the time of cross-slot scheduling.

In an embodiment of the present invention, when the PDSCH is scheduled from the base station to the UE in the cross-slot scheduling, the starting OFDM symbol position of the PDSCH may be fixed to start from a specific OFDM symbol, with reference to FIG. The starting OFDM symbol position of the PDSCH can be determined by the number of OFDM symbols that the CORESETS can occupy to the maximum. The UE sets the start position of the PDSCH with the maximum OFDM symbol length occupied by the CORESETs configured in the UE so as to know the start OFDM symbol position of the cross-slot scheduled PDSCH according to the fixed value, and performs reception of the PDSCH from the symbol position.

Referring to FIG. 27, when the PDSCH is scheduled from the base station to the mobile station in the cross-slot scheduling, the starting OFDM symbol position of the PDSCH can always be fixed to start from a specific OFDM symbol. The start OFDM symbol position of the PDSCH can be informed to the UE by the RRC signal or periodically transmitted System information value to the UE and the UE can know the start OFDM symbol position of the PDSCH that is cross-slot scheduled according to the received value. The starting OFDM symbol position to be informed may be informed for each PRB or several consecutive PRBs of the cell and may be known according to the PRBs of the cross-slot scheduled PDSCH. Alternatively, the starting OFDM symbol of the informing PDSCH may inform a common value to all the PRBs of the cell, and the starting OFDM symbol position of the cross-slot scheduled PDSCH may be always started from one known value .

In an embodiment of the present invention, when a PDSCH is scheduled from a base station to a mobile station by cross-slot scheduling, the mobile station indicates a position of one PDSCH start OFDM symbol through a DCI transmitted by a PDCCH for scheduling from the base station to the mobile station And can receive the PDSCH from its starting OFDM symbol location. When the PDSCH start OFDM symbol position is indicated from the DCI indicating the cross-slot scheduling, the DCI can indicate whether the RESET time-frequency resource can be used as the PDSCH. In another embodiment, when a PDSCH start OFDM symbol position is indicated from a DCI indicating cross-slot scheduling, a bit-field indicating whether the RESET time-frequency resource can be used as a PDSCH in the DCI can be used for another purpose And the RESET time-frequency resource is not always available for the PDSCH. For example, in the case of non-cross-slot scheduling, a bit-field indicating whether the RESET time-frequency resource can be used as a PDSCH indicates whether the RESET time-frequency resource can be used as a PDSCH, , The bit-field may be reused as information indicating which slot the PDSCH was assigned to in which slot. Whether the DCI is cross-slot scheduling or not can be explicitly included in the DCI by 1 bit, scrambled with different RNTI (Radio Network Temporary Identifier), or different DCI format.

In another embodiment, a PDSCH is allocated based on a PDSCH frequency allocation resource allocated by a base station through cross-slot scheduling regardless of overlapped-RESET (s) based on N bits size configured to be configurable from a base station to a UE The frequency resource is divided equally into ^2N , and the L1 signaling or the DCI indicates whether the corresponding resource divided into ^2N can be allocated to the PDSCH, and the UE receives the PDSCH and judges whether the PDSCH is allocated to the corresponding area Method can be used.

In an embodiment of the present invention, when a PDSCH is scheduled from a base station to a mobile station by cross-slot scheduling, the mobile station indicates a position of one PDSCH start OFDM symbol through a DCI transmitted by a PDCCH for scheduling from the base station to the mobile station PRBs other than the PRESs overlapping with the CORESET (s) configured to themselves receive the PDSCH from its starting OFDM symbol position, and the PRBs overlapping with the CORESET (s) configured to it are allocated to the next OFDM The PDSCH can be received after the symbol.

In the 3GPP NR system, one PDCCH can schedule a PDSCH in a plurality of slots. This scheduling scheme is called slot aggregation-based scheduling. For example, the PDCCH mapped to the CORESET of the nth slot can schedule the PDSCH to slots n, n + 1, ..., n + k. At this time, k is a natural number larger than 1. Since the time-frequency resources occupied by the PDCCHs mapped to CORESET may change from slot to slot, when the PDCCH is transmitted during slot aggregation-based scheduling, the start position of the PDSCH allocated to the slot (s) An unknown situation may occur. Another problem addressed by the present invention is to inform the start location of the PDSCH when scheduling based on slot aggregation.

In an embodiment of the present invention, when information on whether RESET (s) can be used as a PDSCH in the DCI is not included, a PDSCH start OFDM symbol position can be determined as follows. When a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a PDSCH start OFDM symbol position of a current slot is indicated in a DCI, and a start OFDM symbol position of a PDSCH of each slot except a current slot is always allocated to a specific OFDM It can be fixed to start from the symbol. In one embodiment, the fixed starting OFDM symbol position may be determined by the number of OFDM symbols that the CORESETs can occupy to the maximum. In yet another preferred embodiment, the fixed starting OFDM symbol position may be set to a value indicated in the DCI at the current slot. In another preferred embodiment, the fixed starting OFDM symbol position may be always the first OFDM symbol position of each slot. The UE can know the start OFDM symbol position of the slot aggregation based scheduling PDSCH in each slot except the current slot according to the fixed value.

According to an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station by slot aggregation-based scheduling, a start OFDM symbol position of a PDSCH of each slot can be fixed to start from a specific OFDM symbol. The starting OFDM symbol position can be informed to the UE by the RRC signal or periodically transmitted System information value, and the UE can know the starting OFDM symbol position of the slot aggregation-based scheduled PDSCH according to the received value. The starting OFDM symbol position to be informed may be indicated for each PRB or several consecutive PRBs of the cell and the starting OFDM symbol position may be known according to the PRBs of the slot aggregation based scheduling PDSCH. Alternatively, the indicating start position can inform a single value to all the PRBs of the cell, and the starting OFDM symbol position of the slot aggregation-based scheduled PDSCH can always start from one known value.

28, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station by slot aggregation-based scheduling, a mobile station transmits a DCI transmitted by a PDCCH for scheduling to a mobile station from a base station It is possible to receive one PDSCH start OFDM symbol position and receive the PDSCH using the start OFDM symbol position information every slot. 26, if the PDSCH start OFDM symbol position in the nth slot is the third OFDM symbol, the PDSCH start OFDM symbol position in the (n + 1) th slot is also the third OFDM symbol.

29, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station by slot aggregation-based scheduling, a mobile station transmits a DCI transmitted by a PDCCH for scheduling to a mobile station from a base station A slot where the PDCCH is scheduled can receive the PDSCH from the indicated starting OFDM symbol position, and then the PDSCH starting OFDM symbol position of the slots can be fixed. The fixed start OFDM symbol position in the slot (s) scheduled for slot aggregation from the base station can be determined by the number of OFDM symbols for which CORESETs can occupy the maximum. In other words, in FIG. 29, when the maximum CORESET length of the cell is two OFDM symbols, the start OFDM symbol position of the PDSCH in the (n + 1) th slot can start from the third OFDM after the maximum length 2 of the CORESET.

According to an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a mobile station transmits a PDSCH start OFDM through a DCI transmitted by a PDCCH for scheduling to a mobile station symbol positions can be indicated, and the slot on which the PDCCH is scheduled can receive the PDSCH from the indicated starting OFDM symbol position, and then the PDSCH starting OFDM symbol position of the slots can be fixed. The fixed start OFDM symbol position in the slot (s) scheduled for slot aggregation at the time of slot aggregation from the base station can be informed to the UE by the RRC signal or periodically transmitted System information value. The starting OFDM symbol position to be informed may be indicated for each PRB or several consecutive PRBs of the cell and the starting OFDM symbol position may be known according to the PRBs of the slot aggregation based scheduling PDSCH. Alternatively, the starting OFDM symbol position may inform a common value to all the PRBs of the cell.

According to an embodiment of the present invention, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a mobile station transmits a PDSCH start OFDM through a DCI transmitted by a PDCCH for scheduling to a mobile station symbol positions, PRBs except for PRBs overlapping with CORESET (s) configured for themselves in each slot, receive the PDSCH from its starting OFDM symbol position, and PRBs overlapping with the CORESET (s) The PDSCH can be received from the next OFDM symbol after the end of the PDSCH.

In one embodiment of the present invention, when information on whether RESET (s) can be used as a PDSCH in the DCI is included, a PDSCH start OFDM symbol position and a RESET (s) PDSCH. ≪ / RTI > When a PDSCH is scheduled in a plurality of slots from a base station to a mobile station in a slot aggregation-based scheduling, a PDSCH start OFDM symbol position of a current slot is indicated in a DCI, and a start OFDM symbol position of a PDSCH of each slot except a current slot is always allocated to a specific OFDM It can be fixed to start from the symbol. Also, information on whether RESET (s) can be used for PDSCH transmission in the current slot can be transmitted in the DCI, and then it can be assumed that RESET (s) can not always be used for PDSCH transmission in the slot. Preferably, the fixed starting OFDM symbol position may be always the first OFDM symbol position of each slot.

30, when a PDSCH is scheduled in a plurality of slots from a base station to a mobile station through slot aggregation-based scheduling, a mobile station transmits a DCI transmitted by a PDCCH for scheduling to a mobile station from a base station A slot where the PDCCH is scheduled can receive the PDSCH from the indicated starting OFDM symbol position and then the PDSCH start OFDM symbol position of the slots can be from the first OFDM symbol of the slot have. At this time, it can be assumed that information on whether RESET (s) can be used as a PDSCH in the DCI applies only to the current slot and RESET (s) can not be used as a PDSCH in the remaining slots. In other words, in FIG. 28, it can be assumed that RESET (s) is not used as a PDSCH in the next slot even if RESET (s) is available on the PDSCH in the current slot.

According to another embodiment, the Node-B can allocate the PDSCH to the PDSCH based on the PDSCH frequency allocation resource allocated by the base station through the slot aggregation scheduling regardless of the overlapped-RESET (s) A method of dividing the resources evenly into ^2N and instructing the L1 signaling or the DCI to determine whether the corresponding resource divided into ^2N can be allocated to the PDSCH and receiving the PDSCH and determining whether the PDSCH is allocated to the corresponding area from the base station Can be used.

Another problem to be solved by the present invention is the location of the starting OFDM symbol and the position of the end OFDM symbol (or the length of the PDSCH (or PUSCH)) and the frequency domain allocation information delivery method.

31 is a diagram illustrating how one slot of a mobile communication system using TDD is configured. One slot may be composed of 7 OFDM symbols, and a gap (GP) of one OFDM symbol length may exist when the downlink-uplink is changed. In addition, one OFDM symbol may be used to convey DL control information. The structure of the slot can be extended even when there is a gap of at least one OFDM symbol length in a slot made up of 14 OFDM symbols. Referring to FIG. 17, it is possible to have eight slot configurations. The slot configuration 0 is a slot composed of downlink OFDM symbols. The slot configuration 1 is a slot composed of six downlink OFDM symbols and one GP. The slot configuration 2 is a slot composed of five downlink OFDM symbols, one GP, and one uplink OFDM symbol. The slot configuration 3 is a slot composed of four downlink OFDM symbols, one GP, and two uplink OFDM symbols. The slot configuration 4 is a slot composed of three OFDM symbols, one GP, and three uplink OFDM symbols. The slot configuration 5 is a slot composed of two OFDM symbols, one GP, and four uplink OFDM symbols. The slot configuration 6 is a slot composed of one OFDM symbol, one GP, and five uplink OFDM symbols. The slot configuration 7 is a slot composed of 7 uplink OFDM symbols. In the present invention, a slot configuration 0 is referred to as a DL-only slot, a slot configuration 7 is referred to as a UL-only slot, and slot configurations 1, 2, 3, 4, 5 and 6 are referred to as a DL / UL hybrid slot.

A control resource set for PDCCH transmission in non-UL-only slot configurations (slot configurations 0, 1, 2, 3, 4, 5, and 6) may consist of the first or several DL symbols of the slot. In this control resource set, the group common PDCCH and the UE-specific PDCCH can be transmitted. The group common PDCCH is designed to be received by one or more UEs, and may include information on the slot configuration described above. Referring to FIG. 17, the base station may include slot configuration information for the current slot only, configuration information for the current slot and the next slot, or slot configuration information for the current slot and the future N slots through the group common PDCCH. The UE can set the configuration of N slots (N is a natural number equal to or greater than 1) present slots after the current slot or the current slot to be known at the time of receiving the group common PDCCH according to the information on the slot configuration transmitted from the group common PDCCH. Here, N is a natural number equal to or greater than 1, N can be dynamically changed or configured to be RRC, or a method of setting the base station to dynamically indicate to the UE in a set configured by RRC may be possible.

Referring to FIGS. 17 and 31, in order to receive the PDSCH, the UE must know the location of the start OFDM symbol of the PDSCH, the location of the end OFDM symbol (or length of the PDSCH), and the frequency domain allocation information. The base station must inform the UE through the downlink control information (DCI) included in the downlink control channel for scheduling the PDSCH in order for the UE to correctly receive the PDSCH. In the present invention, a method for informing a terminal of the location of the start OFDM symbol of the PDSCH, the location of the end OFDM symbol, and the allocation information of the frequency domain is described. To this end, the present invention describes a method for effectively informing allocation information of a start OFDM symbol position, an end OFDM symbol position (or a PDSCH length) and a frequency domain, and the allocated PDSCH resource overlaps with a resource allocated to a CORESET , A method for using overlapping portions for transmission of the PDSCH is described. The UE receives downlink control information (DCI) included in a downlink control channel for scheduling a PDSCH transmitted from a base station, and outputs the position of the start OFDM symbol, the position of the end OFDM symbol, A description will be given of a method for reception. Also, a method of receiving a PDSCH in an overlapped portion when a PDSCH resource transmitted from a base station overlaps with a resource allocated to a CORESET is described.

Referring to FIGS. 17 and 31, in order for the UE to transmit the PUSCH, the position of the start OFDM symbol, the position of the end OFDM symbol (or the length of the PUSCH), and the frequency domain allocation information of the PUSCH must be known. In order for the MS to correctly transmit the PUSCH, the BS must inform the BS through the downlink control information (DCI) included in the downlink control channel for scheduling the PUSCH. In the present invention, a method for notifying the terminal of the position of the start OFDM symbol of the PUSCH, the position of the end OFDM symbol, and the allocation information of the frequency domain will be described. To this end, a method for effectively informing allocation information of a start OFDM symbol position, an end OFDM symbol position (or a PUSCH length) and a frequency domain will be described. The UE receives downlink control information (DCI) included in the downlink control channel for scheduling the PUSCH from the base station and receives allocation information of the start OFDM symbol position and the end OFDM symbol and the frequency domain of the PUSCH scheduled by the base station A method for the present invention will be described.

Referring to FIG. 32, the UE-specific PDCCH for scheduling PDSCH can inform the position of the start symbol of the PDSCH, the position of the end symbol, and information on the allocated PRBs. Also, the UE-specific PDCCH for scheduling the PUSCH can indicate the position of the start symbol of the PUSCH, the position of the end symbol, and information on the allocated PRBs.

In the LTE, a resource indication value (RIV) scheme has been proposed as a method for indicating a continuously allocated resource. In the RIV scheme, the number of blocks allocated consecutively from the starting position can be obtained from the RIV value. In LTE type-2 resource allocation, RB is used to allocate consecutive RBs. More specifically, the PDCCH DCI format, 1A, 1B, 1D and EPDCCH DCI formats 1A, 1B, 1D, and MPDCCH DCI format 6-1A have RIV values. The RIV _start value and the RB _start value L _CRBs , which is the number of allocated RBs. The value of RIV for this is set as follows.

Note that N ^DL _RB is the number of RBs used for downlink resource allocation. If a type-2 resource allocation scheme is used in the uplink, N ^DL _RB can be replaced with N ^UL _RB , which is the number of RBs used for uplink resource allocation.

이라고 하면, 가능한 RB 시작 값은 RB _start=0,

, 2

,...,

이고 가능한 연속된 RB의 수는 L _CRBs =

, 2

,...,

이다. 이때, RIV의 값은 다음과 같이 정할 수 있다. Also, type-2 resource allocation in the PDCCH format 1C may be performed by grouping several RBs. The size of the bundled RB

, The possible RB start values are RB _start = 0,

, 2

, ...,

And the number of possible consecutive RBs is L _CRBs =

, 2

, ...,

to be. At this time, the value of RIV can be determined as follows.

Note that N ^DL _RB is the number of RBs used for downlink resource allocation. If a type-2 resource allocation scheme is used in the uplink, N ^DL _RB can be replaced with N ^DL _RB , which is the number of RBs used for uplink resource allocation.

Similar to the method of indicating continuous RBs in the frequency domain, successive OFDM symbols in the time domain can be indicated using RIV. Let N _symbol be the total number of OFDM symbols to point to. Let the start OFDM symbol index be S _start and the number of _symbols be L _symbols . The value of RIV can be expressed as:

thenif

then

else

and shall not exceed

.where

and shall not exceed

.

Note that the S _start value can be interpreted as the starting position in the slot. That is, if S _start = 0, it is possible to start from the first OFDM symbol in the slot.

이라고 하면, 가능한 RB 시작 값은

,

,

,...,

이고 가능한 연속된 RB의 수는

=

,

,…,

이다. 이때, RIV의 값은 다음과 같이 정할 수 있다. Similar to the method of indicating continuous RBs in the frequency domain, successive OFDM symbols in the time domain can be indicated using RIV. At this time, several OFDM symbols can be bundled and directed. Let N _symbol be the total number of OFDM symbols to point to. The size of the bundled symbol

, The possible RB start values are

,

,

, ...,

And the number of possible consecutive RBs is

=

,

, ... ,

to be. At this time, the value of RIV can be determined as follows.

thenif

then

else

,

and

.where

,

and

.

1 and shall not exceed

.where

1 and shall not exceed

.

The base station must transmit the frequency domain allocation information and the time domain allocation region to the downlink control signal (e.g., downlink control information, DCI). The UE can receive the data channel according to the frequency-domain allocation information and the time allocation information (in the case of downlink) or transmit (in case of the uplink) by receiving the frequency-domain allocation information. In DCI using type-2 resource allocation method, frequency domain RIV value and time domain RIV value can be transmitted. For convenience of expression, RIV _freq is expressed as a frequency domain RIV value, and RIV _time is represented as a time domain RVI value.

이다. As shown in FIG. 33, two RIV values (RIV _freq and RIV _time ) can be independently transmitted from a DCI using Type-2 resource allocation. In this case, if the maximum RIV value is Q,

to be.

For example, if there are 6 RBs and 9 OFDM symbols in the resource allocation, RIV _freq can have one of the values from 0 to 20, and the RIV _time can have values from 0 to 44. Therefore, 5 bits are needed for RIV _freq and 6 bits for RIV _time . Therefore, a total of 11 bits is required.

일 때, 두 RIV가 함께 인코딩된 전체 RIV값 RIV_total를 는 다음과 같이 표현할 수 있다. In a preferred embodiment of the present invention, referring to FIG. 34, two RIV values, RIV ₁ and RIV ₂ (RIV ₁ and RIV ₂ may be RIV _freq and RIV _time ) can be encoded and transmitted together. The maximum value that RIV ₁ can have

, The total RIV value RIV _total encoded with the two RIVs can be expressed as:

^.

^.

값으로부터

와

를 다음과 같이 구할 수 있다.

From the value

Wow

Can be obtained as follows.

이고

1 RB 단위로 할당하면,

이다.

RB 단위로 할당할 때,

이고 여기서

이다. 참고로,

는 자원할당에 사용할 수 있는 하향링크 RB의 수이다. 상기 방식을 상향링크에 사용할 때,

대신 상향링크 자원할당에 사용할 수 있는 상향링크 RB의 수

으로 대체될 수 있다.E.g,

ego

When assigned in units of 1 RB,

to be.

When allocating in RB units,

Where

to be. Note that,

Is the number of downlink RBs available for resource allocation. When using this scheme for uplink,

Instead, the number of uplink RBs that can be used for uplink resource allocation

. ≪ / RTI >

이고

1 OFDM symbol 단위로 할당하면,

이다.

RB 단위로 할당할 때,

이고 여기서

이다. E.g,

ego

If allocated in one OFDM symbol unit,

to be.

When allocating in RB units,

Where

to be.

In a preferred embodiment of the invention, three or more RIV values (e.g., three, RIV ₁ , RIV ₂ , RIV ₃ ) Can be encoded and transmitted together. To do this, two RIV values are sequentially encoded. For example, you can encode two RIV values out of three RIV values together (for example, RIV ₁ and RIV ₂ ) first, and then encode the three RIV values together by encoding the RIV value and RIV ₃ together.

For example, if there are 6 RBs and 9 OFDM symbols in the resource allocation, RIV _freq can have one of the values from 0 to 20, and the RIV _time can have values from 0 to 44. At this time, if RIV values are encoded together as described above, RIV _total can have a value from 0 to 944. Therefore, 10 bits are required for RIV _total . Thus, compared to sending two RIV values each, one bit can be reduced. A more detailed comparison can be found in Table 3 and Table 4. Table 3 shows two RIV values sent separately, and Table 4 shows two RIV values encoded according to the present invention.

In the description of the present invention, the time frequency resource allocation through the DCI is described. However, the present invention is not limited thereto and the present invention can be used in an indicator that can be indicated by the RIV method. For example, it can be used for time-frequency resource allocation through an RRC signal in the joint encoding RIV scheme of the present invention. As another example, the present invention can be used to inform the terminal of pre-empted time and frequency resources in the joint encoding RIV scheme. Here, the preemption resource refers to a resource used to transmit some of the resources allocated to one terminal to another terminal.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (1)

A method, apparatus, and system for performing PDSCH demodulation by receiving allocation and mapping information of a PDSCH from a PDSCH start position in which a mobile station is instructed via downlink control information (DCI) from a base station in a mobile communication system

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