KR20220112154A - Method and apparatus of channel state information reporting via uplink data repetition in network cooperative communications - Google Patents

Abstract

The present invention relates to a communication technique that combines a 5G communication system with an IoT technology to support a higher data transmission rate after a 4G system and a system thereof. The present invention can be applied to intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. According to the present invention, disclosed is a coverage increasing method for a PDCCH in a wireless communication system.

Description

Method and apparatus for reporting channel state information through repeated transmission of uplink data in network cooperative communication

The present disclosure relates to operations of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method of reporting channel state information through repeated transmission of uplink data in network cooperative communication in a wireless communication system, and an apparatus capable of performing the same.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system in order to meet the increasing 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 the LTE system after (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the very high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network: cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway. In addition, in the 5G system, the advanced coding modulation (ACM) methods FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technologies FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

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

Accordingly, various attempts have been made to apply the 5G communication system (5th generation communication system or New Radio (NR)) to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are being implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. . The application of cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 3eG technology and IoT technology.

As various services can be provided according to the above-mentioned and the development of wireless communication systems, a method for smoothly providing these services is required.

The disclosed embodiments are intended to provide an apparatus and method capable of effectively providing a service in a mobile communication system.

The present invention for solving the above problems is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

The disclosed embodiment provides an apparatus and method for effectively providing a service in a mobile communication system.

1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to an embodiment of the present disclosure.
3 is a diagram illustrating an example of setting a bandwidth portion in a wireless communication system according to an embodiment of the present disclosure.
4 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
5A is a diagram illustrating a structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
5B is a diagram illustrating a case in which a terminal may have a plurality of PDCCH monitoring positions within a slot in a wireless communication system according to an embodiment of the present disclosure through a Span.
6 is a diagram illustrating an example of a DRX operation in a wireless communication system according to an embodiment of the present disclosure.
7 is a diagram illustrating an example of base station beam allocation according to TCI state configuration in a wireless communication system according to an embodiment of the present disclosure.
8 is a diagram illustrating an example of a method of allocating a TCI state for a PDCCH in a wireless communication system according to an embodiment of the present disclosure.
9 is a diagram illustrating a TCI indication MAC CE signaling structure for PDCCH DMRS in a wireless communication system according to an embodiment of the present disclosure.
10 is a diagram illustrating an example of beam configuration of a control resource set and a search space in a wireless communication system according to an embodiment of the present disclosure.
11 is a diagram for describing a method for a base station and a terminal to transmit and receive data in consideration of a downlink data channel and a rate matching resource in a wireless communication system according to an embodiment of the present disclosure.
12 is a diagram for describing a method for a terminal to select a receivable control resource set in consideration of a priority when receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
13 is a diagram illustrating an example of an aperiodic CSI reporting method according to an embodiment of the present disclosure.
14 is a diagram illustrating an example of allocation of a frequency axis resource of a PDSCH in a wireless communication system according to an embodiment of the present disclosure.
15 is a diagram illustrating an example of time axis resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure.
16A is a diagram illustrating an example of time axis resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure.
16B is a diagram illustrating an example of repeated PUSCH transmission type B in a wireless communication system according to an embodiment of the present disclosure.
17 is a diagram illustrating a radio protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation in a wireless communication system according to an embodiment of the present disclosure.
18 is a diagram illustrating an example of an antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
19 is a diagram illustrating a configuration example of downlink control information (DCI) for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
20 illustrates operations of a base station and a terminal for repeated PUSCH transmission in consideration of multiple TRP based on single DCI transmission in which a plurality of SRI or TPMI fields exist according to an embodiment of the present disclosure.
21 is a diagram illustrating an operation of a terminal in consideration of Embodiment 3 of the present disclosure.
22 is a diagram illustrating an operation of a base station in consideration of Embodiment 3 of the present disclosure.
23 is a diagram illustrating an operation of a terminal in consideration of Embodiment 4 of the present disclosure.
24 is a diagram illustrating an operation of a base station in consideration of Embodiment 4 of the present disclosure.
25 is a diagram illustrating a structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.
26 is a diagram illustrating a structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numbers.

Advantages and features of the present disclosure and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present disclosure to be complete, and common knowledge in the art to which the present disclosure belongs It is provided to fully inform those who have the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. In addition, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, the base station is a subject performing resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) is a wireless transmission path of a signal transmitted from a terminal to a flag station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this, and the following 5G may be a concept including existing LTE, LTE-A and other similar services. have. In addition, the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible for the instructions stored in the flowchart block(s) to produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in the blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~ unit' performs certain roles do. However, '~part' is not limited to software or hardware. '~unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

A wireless communication system, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e, such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.

As a representative example of the broadband wireless communication system, in an LTE system, an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in a downlink (DL), and a single carrier frequency division multiple (SC-FDMA) scheme is used in an uplink (UL). Access) method is adopted. Uplink refers to a radio link in which a UE (User Equipment) or MS (Mobile Station) transmits data or control signals to a base station (eNode B, or base station (BS)). It means a wireless link that transmits data or control signals. In the multiple access method as described above, the data or control information of each user can be divided by allocating and operating the time-frequency resources to which the data or control information is transmitted for each user so that they do not overlap each other, that is, orthogonality is established. can

As a future communication system after LTE, that is, the 5G communication system must be able to freely reflect various requirements of users and service providers, so services that simultaneously satisfy various requirements must be supported. Services considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), Ultra Reliability Low Latency Communication (URLLC), etc. There is this.

eMBB aims to provide a higher data transfer rate than the data transfer rates supported by existing LTE, LTE-A or LTE-Pro. For example, in the 5G communication system, the eMBB should be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station. In addition, the 5G communication system must provide the maximum transmission speed and at the same time provide the increased user perceived data rate of the terminal. In order to satisfy such a requirement, it is required to improve various transmission/reception technologies, including a more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology. In addition, while transmitting signals using up to 20 MHz transmission bandwidth in the 2 GHz band used by LTE, the 5G communication system uses a frequency bandwidth wider than 20 MHz in the frequency band of 3 to 6 GHz or 6 GHz or more. The transmission speed can be satisfied.

At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in the 5G communication system. In order to efficiently provide the Internet of Things (IoT), mMTC requires large-scale terminal access support, improved terminal coverage, improved battery life, and reduced terminal cost within a cell. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km2) within a cell. In addition, since a terminal supporting mMTC is highly likely to be located in a shaded area not covered by a cell, such as the basement of a building, due to the nature of the service, it may require wider coverage compared to other services provided by the 5G communication system. A terminal supporting mMTC should be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

Finally, in the case of URLLC, it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control for a robot or machine, industrial automation, Unmaned Aerial Vehicle, remote health care, emergency situation A service used for an emergency alert, etc. may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time has a requirement of a packet error rate of 10 ^-5 or less. Therefore, for a service that supports URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that requires a wide resource allocation in the frequency band to secure the reliability of the communication link. items may be required.

The three services of 5G, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services to satisfy different requirements of each service. Of course, 5G is not limited to the three services described above.

[NR time-frequency resource]

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in a 5G system.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(Resource Block, RB, 104)을 구성할 수 있다. 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domain, the basic unit of a resource is a resource element (RE, 101), which is defined as 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol 102 on the time axis and 1 subcarrier 103 on the frequency axis. can be in the frequency domain

(for example, 12) consecutive REs may constitute one resource block (Resource Block, RB, 104).

2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to an embodiment of the present disclosure.

)=14). 1 서브프레임(201)은 하나 또는 복수 개의 슬롯(202, 203)으로 구성될 수 있으며, 1 서브프레임(201)당 슬롯(202, 203)의 개수는 부반송파 간격에 대한 설정 값 μ(204, 205)에 따라 다를 수 있다. 도 2의 일 예에서는 부반송파 간격 설정 값으로 μ=0(204)인 경우와 μ=1(205)인 경우가 도시되어 있다. μ=0(204)일 경우, 1 서브프레임(201)은 1개의 슬롯(202)으로 구성될 수 있고, μ=1(205)일 경우, 1 서브프레임(201)은 2개의 슬롯(203)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 표 1로 정의될 수 있다.FIG. 2 shows an example of a structure of a frame 200 , a subframe 201 , and a slot 202 . One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus one frame 200 may be composed of a total of 10 subframes 201 . One slot (202, 203) may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). One subframe 201 may consist of one or a plurality of slots 202 and 203, and the number of slots 202 and 203 per one subframe 201 is a set value μ(204, 205) for the subcarrier spacing. ) may vary depending on In the example of FIG. 2 , a case of μ=0 (204) and a case of μ=1 (205) are illustrated as subcarrier spacing setting values. When μ=0 (204), one subframe 201 may consist of one slot 202, and when μ=1 (205), one subframe 201 may consist of two slots 203. can be composed of That is, the number of slots per subframe (

) may vary, and accordingly, the number of slots per frame (

) may be different. According to each subcarrier spacing setting μ

and

may be defined in Table 1 below.

[Table 1]

[Bandwidth part (BWP)]

Next, a bandwidth part (BWP) setting in the 5G communication system will be described in detail with reference to the drawings.

3 is a diagram illustrating an example of setting a bandwidth portion in a wireless communication system according to an embodiment of the present disclosure.

3 shows an example in which the terminal bandwidth (UE bandwidth) 300 is set to two bandwidth parts, that is, a bandwidth part #1 (BWP#1) 301 and a bandwidth part #2 (BWP#2) 302. show The base station may set one or a plurality of bandwidth portions to the terminal, and may set the following information for each bandwidth portion.

[Table 2]

Of course, it is not limited to the above example, and in addition to the configuration information, various parameters related to the bandwidth portion may be configured in the terminal. The information may be transmitted by the base station to the terminal through higher layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth portion among the set one or a plurality of bandwidth portions may be activated. Whether to activate the set bandwidth portion may be semi-statically transmitted from the base station to the terminal through RRC signaling or may be dynamically transmitted through downlink control information (DCI).

According to some embodiments, the terminal before the RRC (Radio Resource Control) connection may receive an initial bandwidth portion (Initial BWP) for the initial connection from the base station through the MIB (Master Information Block). More specifically, the terminal receives the system information (Remaining System Information; RMSI or System Information Block 1; may correspond to SIB1) required for initial access through the MIB in the initial access stage. PDCCH for receiving can be transmitted. It is possible to receive setting information for a control resource set (CORESET) and a search space (Search Space). The control region and the search space set by the MIB may be regarded as identifier (Identity, ID) 0, respectively. The base station may notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for the control region #0 through the MIB. In addition, the base station may notify the UE of configuration information on the monitoring period and occasion for the control region #0, that is, configuration information on the search space #0 through the MIB. The UE may regard the frequency domain set as the control region #0 obtained from the MIB as an initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be regarded as 0.

The configuration of the bandwidth part supported by the 5G may be used for various purposes.

According to some embodiments, when the bandwidth supported by the terminal is smaller than the system bandwidth, this may be supported through the bandwidth part setting. For example, the base station sets the frequency position (setting information 2) of the bandwidth part to the terminal, so that the terminal can transmit and receive data at a specific frequency location within the system bandwidth.

Also, according to some embodiments, the base station may set a plurality of bandwidth portions to the terminal for the purpose of supporting different numerologies. For example, in order to support both data transmission and reception using a subcarrier interval of 15 kHz and a subcarrier interval of 30 kHz to a certain terminal, two bandwidth portions may be set to a subcarrier interval of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed, and when data is transmitted/received at a specific subcarrier interval, a bandwidth portion set for the corresponding subcarrier interval may be activated.

Also, according to some embodiments, for the purpose of reducing power consumption of the terminal, the base station may set a bandwidth portion having different sizes of bandwidths to the terminal. For example, when the terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz and always transmits and receives data using the corresponding bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in a situation in which there is no traffic may be very inefficient in terms of power consumption. For the purpose of reducing power consumption of the terminal, the base station may set a relatively small bandwidth portion for the terminal, for example, a bandwidth portion of 20 MHz. In a situation in which there is no traffic, the terminal may perform a monitoring operation in the 20 MHz bandwidth portion, and when data is generated, it may transmit/receive data in the 100 MHz bandwidth portion according to the instruction of the base station.

In the method of setting the bandwidth part, terminals before RRC connection (Connected) may receive configuration information on the initial bandwidth part through a master information block (MIB) in the initial access stage. More specifically, the UE is a control region for a downlink control channel through which Downlink Control Information (DCI) for scheduling a System Information Block (SIB) can be transmitted from the MIB of a Physical Broadcast Channel (PBCH) (Control Resource Set, CORESET) can be set. The bandwidth of the control region configured as the MIB may be regarded as an initial bandwidth portion, and the UE may receive a Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted through the configured initial bandwidth portion. In addition to the purpose of receiving the SIB, the initial bandwidth portion may be utilized for other system information (OSI), paging, and random access.

[Bandwidth part (BWP) change]

When one or more bandwidth portions are configured for the terminal, the base station may instruct the terminal to change (or switch, transition) the bandwidth portion by using a Bandwidth Part Indicator field in DCI. For example, in FIG. 3 , when the currently activated bandwidth portion of the terminal is the bandwidth portion #1 (301), the base station may indicate to the terminal the bandwidth portion #2 (302) as a bandwidth portion indicator in DCI, and the terminal receives the received A bandwidth portion change may be performed to the bandwidth portion #2 (302) indicated by the bandwidth portion indicator in the DCI.

As described above, since the DCI-based bandwidth part change can be indicated by the DCI scheduling the PDSCH or the PUSCH, when the terminal receives the bandwidth part change request, the PDSCH or the PUSCH scheduled by the DCI is unreasonable in the changed bandwidth part. It shall be able to perform reception or transmission without To this end, the standard stipulates the requirements for the delay time (T _BWP ) required when the bandwidth part is changed, and may be defined, for example, as follows.

[Table 3]

The requirement for the bandwidth part change delay time supports Type 1 or Type 2 according to the capability of the terminal. The terminal may report the supportable bandwidth partial delay time type to the base station.

In accordance with the above-described requirement for the bandwidth portion change delay time, when the terminal receives the DCI including the bandwidth portion change indicator in slot n, the terminal transmits the change to the new bandwidth portion indicated by the bandwidth portion change indicator in slot n+ It can be completed at a time point not later than T _BWP , and transmission and reception for the data channel scheduled by the corresponding DCI can be performed in the new changed bandwidth part. When the base station intends to schedule the data channel with a new bandwidth portion, the time domain resource allocation for the data channel may be determined in consideration of the bandwidth portion change delay time (T _BWP ) of the terminal. That is, when scheduling a data channel with a new bandwidth portion, the base station may schedule the corresponding data channel after the bandwidth portion change delay time in a method of determining time domain resource allocation for the data channel. Accordingly, the UE may not expect that the DCI indicating the bandwidth portion change indicates a slot offset (K0 or K2) value smaller than the bandwidth portion change delay time (T _BWP ).

If the terminal receives a DCI (eg, DCI format 1_1 or 0_1) indicating a bandwidth part change, the terminal receives the PDCCH including the DCI from the third symbol of the slot, the time domain resource allocation indicator field in the DCI No transmission or reception may be performed during the time period corresponding to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by . For example, if the terminal receives a DCI indicating a bandwidth part change in slot n, and the slot offset value indicated by the DCI is K, the terminal starts from the third symbol of slot n to the symbol before slot n + K (that is, the slot No transmission or reception may be performed until the last symbol of n+K-1).

[SS/PBCH block]

Next, an SS (Synchronization Signal)/PBCH block in 5G will be described.

The SS/PBCH block may mean a physical layer channel block composed of a primary SS (PSS), a secondary SS (SSS), and a PBCH. Specifically, it is as follows.

- PSS: A signal that serves as a reference for downlink time/frequency synchronization and provides some information on cell ID.

- SSS: serves as a reference for downlink time/frequency synchronization, and provides remaining cell ID information not provided by PSS. Additionally, it may serve as a reference signal for demodulation of the PBCH.

- PBCH: Provides essential system information necessary for transmitting and receiving data channel and control channel of the terminal. The essential system information may include search space-related control information indicating radio resource mapping information of a control channel, scheduling control information on a separate data channel for transmitting system information, and the like.

- SS/PBCH block: The SS/PBCH block consists of a combination of PSS, SSS, and PBCH. One or a plurality of SS/PBCH blocks may be transmitted within 5 ms, and each transmitted SS/PBCH block may be distinguished by an index.

The UE may detect the PSS and SSS in the initial access phase and may decode the PBCH. The MIB may be obtained from the PBCH, and a control region (CORESET) #0 (which may correspond to a control region having a control region index of 0) may be set therefrom. The UE may perform monitoring on the control region #0, assuming that the selected SS/PBCH block and a demodulation reference signal (DMRS) transmitted in the control region #0 are QCL (Quasi Co Location). The terminal may receive system information as downlink control information transmitted in control region #0. The UE may acquire RACH (Random Access Channel) related configuration information required for initial access from the received system information. The UE may transmit a physical RACH (PRACH) to the base station in consideration of the selected SS/PBCH index, and the base station receiving the PRACH may obtain information on the SS/PBCH block index selected by the UE. The base station can know that the terminal has selected a certain block from each of the SS/PBCH blocks and monitors the control region #0 associated therewith.

[DRX]

6 is a diagram for describing Discontinuous Reception (DRX).

Discontinuous Reception (DRX) is an operation in which a terminal using a service discontinuously receives data in an RRC connected state in which a radio link is established between a base station and a terminal. When DRX is applied, the terminal turns on the receiver at a specific time to monitor the control channel, and if there is no data received for a certain period of time, turns off the receiver to reduce power consumption of the terminal. DRX operation may be controlled by the MAC layer device based on various parameters and timers.

Referring to FIG. 6 , an active time 605 is a time during which the UE wakes up every DRX cycle and monitors the PDCCH. Active time 605 may be defined as follows.

- drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

- a Scheduling Request is sent on PUCCH and is pending; or

- a PDCCH indicating a new transmission addressed to the C-RNTI of the MAC entity has not been received after successful reception of a Random Access Response for the Random Access Preamble not selected by the MAC entity among the contention-based Random Access Preamble

drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, and ra-ContentionResolutionTimer are timers whose values are set by the base station, and provide a function of setting the terminal to monitor the PDCCH when a predetermined condition is satisfied. Have.

The drx-onDurationTimer 615 is a parameter for setting the minimum time that the UE is awake in the DRX cycle. The drx-InactivityTimer 620 is a parameter for setting an additional awake time of the terminal when receiving 630 a PDCCH indicating new uplink transmission or downlink transmission. The drx-RetransmissionTimerDL is a parameter for setting the maximum time that the UE is awake in order to receive downlink retransmission in the downlink HARQ procedure. The drx-RetransmissionTimerUL is a parameter for setting the maximum time that the terminal is awake in order to receive an uplink retransmission grant (grant) in the uplink HARQ procedure. drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL and drx-RetransmissionTimerUL may be set to, for example, time, the number of subframes, the number of slots, and the like. ra-ContentionResolutionTimer is a parameter for monitoring the PDCCH in the random access procedure.

The inActive time 610 is a time set not to monitor the PDCCH or/or a time set not to receive the PDCCH during DRX operation. (610). If the UE does not monitor the PDCCH during the active time 605, the UE may enter a sleep or inActive state to reduce power consumption.

The DRX cycle means a cycle in which the UE wakes up and monitors the PDCCH. That is, after the UE monitors a PDCCH, it means a time interval or an on-duration generation period until monitoring the next PDCCH. There are two types of DRX cycle: short DRX cycle and long DRX cycle. Short DRX cycle may be selectively applied.

The Long DRX cycle 625 is the longest of the two DRX cycles set in the terminal. The UE starts the drx-onDurationTimer 615 again when the Long DRX cycle 625 has elapsed from the starting point (eg, start symbol) of the drx-onDurationTimer 615 while operating in Long DRX. When operating in the Long DRX cycle 625, the UE may start the drx-onDurationTimer 615 in the slot after drx-SlotOffset in the subframe satisfying Equation 1 below. Here, drx-SlotOffset means a delay before starting the drx-onDurationTimer 615 . drx-SlotOffset may be set to, for example, time, number of slots, and the like.

[Equation 1]

[(SFN X 10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset

In this case, drx-LongCycleStartOffset may be used to define a subframe in which the Long DRX cycle 625 and drx-StartOffset will start the Long DRX cycle 625 . drx-LongCycleStartOffset may be set to, for example, time, the number of subframes, the number of slots, and the like.

[PDCCH: related to DCI]

Next, downlink control information (DCI) in the 5G system will be described in detail.

In the 5G system, scheduling information for uplink data (or physical uplink data channel (Physical Uplink Shared Channel, PUSCH)) or downlink data (or physical downlink data channel (Physical Downlink Shared Channel, PDSCH)) is through DCI transmitted from the base station to the terminal. The UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH. The DCI format for countermeasures may be composed of a fixed field predetermined between the base station and the terminal, and the DCI format for non-prevention may include a configurable field.

DCI may be transmitted through a physical downlink control channel (PDCCH), which is a physical downlink control channel, through channel coding and modulation. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC may be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs may be used according to the purpose of the DCI message, for example, UE-specific data transmission, a power control command, or a random access response. That is, the RNTI is not explicitly transmitted, but included in the CRC calculation process and transmitted. Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the assigned RNTI. If the CRC check result is correct, the UE can know that the message has been transmitted to the UE.

For example, DCI scheduling PDSCH for system information (SI) may be scrambled with SI-RNTI. DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled with an RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI. DCI notifying SFI (Slot Format Indicator) may be scrambled with SFI-RNTI. DCI notifying Transmit Power Control (TPC) may be scrambled with TPC-RNTI. DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

DCI format 0_0 may be used as a DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 4]

DCI format 0_1 may be used as a non-preparation DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 5]

DCI format 1_0 may be used as a DCI for scheduling PDSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 1_0 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 6]

DCI format 1_1 may be used as non-preparation DCI for scheduling PDSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 1_1 in which CRC is scrambled with C-RNTI may include, for example, the following information.

[Table 7]

[PDCCH: CORESET, REG, CCE, Search Space]

Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the drawings.

4 is a diagram illustrating an example of a control region (CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. 4 shows two control regions (control region #1 (401), control region #2 (402)) in one slot 420 on the time axis and the UE bandwidth part 410 on the frequency axis. An example of what has been done is shown. The control regions 401 and 402 may be set in a specific frequency resource 403 within the entire terminal bandwidth portion 410 on the frequency axis. As a time axis, one or a plurality of OFDM symbols may be set, and this may be defined as a control region length (Control Resource Set Duration, 404). Referring to the example shown in FIG. 4 , the control region #1 401 is set to a control region length of 2 symbols, and the control region #2 402 is set to a control region length of 1 symbol.

The above-described control region in 5G may be set by the base station to the terminal through higher layer signaling (eg, system information, master information block (MIB), and radio resource control (RRC) signaling). Setting the control region to the terminal means providing information such as a control region identifier (Identity), a frequency position of the control region, and a symbol length of the control region. For example, it may include the following information.

[Table 8]

In Table 8, tci-StatesPDCCH (simply referred to as Transmission Configuration Indication (TCI) state) configuration information is one or a plurality of SS (Synchronization Signals) in a Quasi Co Located (QCL) relationship with DMRS transmitted in a corresponding control region. It may include information of a Physical Broadcast Channel (PBCH) block index or a Channel State Information Reference Signal (CSI-RS) index.

5A is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in 5G. According to FIG. 5A, a basic unit of time and frequency resources constituting a control channel may be referred to as a resource element group (REG) 503, and the REG 503 has 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis. (Physical Resource Block, 502), that is, it may be defined as 12 subcarriers. The base station may configure a downlink control channel allocation unit by concatenating the REG 503 .

As shown in FIG. 5A , when a basic unit to which a downlink control channel is allocated in 5G is referred to as a Control Channel Element (CCE) 504, one CCE 504 may be composed of a plurality of REGs 503 . If the REG 503 shown in FIG. 5A is described as an example, the REG 503 may be composed of 12 REs, and if 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 may be composed of 72 REs. When the downlink control region is set, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel is configured with one or a plurality of CCEs 504 according to an aggregation level (AL) in the control region. It can be mapped and transmitted. The CCEs 504 in the control region are divided by numbers, and in this case, the numbers of the CCEs 504 may be assigned according to a logical mapping method.

The basic unit of the downlink control channel shown in FIG. 5A , that is, the REG 503 , may include both REs to which DCI is mapped and a region to which the DMRS 505 , which is a reference signal for decoding them, is mapped. As in FIG. 5A , three DMRSs 505 may be transmitted within one REG 503 . The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 according to an aggregation level (AL), and the number of different CCEs is the link adaptation of the downlink control channel. can be used to implement For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The UE needs to detect a signal without knowing information about the downlink control channel. For blind decoding, a search space indicating a set of CCEs is defined. The search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given aggregation level, and various aggregations that make one bundle with 1, 2, 4, 8, or 16 CCEs. Since there is a level, the terminal may have a plurality of search spaces. A search space set may be defined as a set of search spaces in all set aggregation levels.

The search space may be classified into a common search space and a UE-specific search space. A group of terminals or all terminals may search the common search space of the PDCCH in order to receive cell-common control information such as dynamic scheduling for system information or a paging message. For example, PDSCH scheduling assignment information for SIB transmission including cell operator information may be received by examining the common search space of the PDCCH. In the case of the common search space, since a certain group of terminals or all terminals must receive the PDCCH, it may be defined as a set of promised CCEs. The UE-specific scheduling assignment information for the PDSCH or PUSCH may be received by examining the UE-specific search space of the PDCCH. The UE-specific search space may be UE-specifically defined as a function of the UE's identity and various system parameters.

In 5G, the parameter for the search space for the PDCCH may be set from the base station to the terminal through higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station is the number of PDCCH candidates in each aggregation level L, the monitoring period for the search space, the monitoring occasion in symbol units in the slot for the search space, the search space type (common search space or terminal-specific search space), A combination of a DCI format and an RNTI to be monitored in the corresponding search space, a control region index to be monitored in the search space, etc. may be set to the UE. For example, it may include the following information.

[Table 9]

According to the configuration information, the base station may set one or a plurality of search space sets to the terminal. According to some embodiments, the base station may set the search space set 1 and the search space set 2 to the terminal, and the DCI format A scrambled with X-RNTI in the search space set 1 may be configured to be monitored in the common search space, and search DCI format B scrambled with Y-RNTI in space set 2 may be configured to be monitored in a UE-specific search space.

According to the configuration information, one or a plurality of search space sets may exist in the common search space or the terminal-specific search space. For example, the search space set #1 and the search space set #2 may be set as the common search space, and the search space set #3 and the search space set #4 may be set as the terminal-specific search space.

In the common search space, a combination of the following DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

- DCI format 2_0 with CRC scrambled by SFI-RNTI

- DCI format 2_1 with CRC scrambled by INT-RNTI

- DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

- DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

In the UE-specific search space, a combination of the following DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

- DCI format 1_0/1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

The specified RNTIs may follow the definitions and uses below.

C-RNTI (Cell RNTI): UE-specific PDSCH scheduling purpose

TC-RNTI (Temporary Cell RNTI): UE-specific PDSCH scheduling purpose

CS-RNTI (Configured Scheduling RNTI): Semi-statically configured UE-specific PDSCH scheduling purpose

RA-RNTI (Random Access RNTI): Used for scheduling PDSCH in the random access phase

P-RNTI (Paging RNTI): PDSCH scheduling purpose for which paging is transmitted

SI-RNTI (System Information RNTI): Used for scheduling PDSCH in which system information is transmitted

INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing.

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control command for PUSCH

TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control command for PUCCH

TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control command for SRS

The specified DCI formats described above may follow the definition below.

[Table 10]

In 5G, the search space of the aggregation level L in the control region p and the search space set s may be expressed as in Equation 2 below.

[Equation 2]

: 집성 레벨-

: Aggregation level

: 캐리어(Carrier) 인덱스-

: Carrier index

: 제어영역 p 내에 존재하는 총 CCE 개수-

: Total number of CCEs in control area p

: 슬롯 인덱스-

: slot index

: 집성 레벨 L의 PDCCH 후보군 수-

: Number of PDCCH candidates of aggregation level L

= 0, ...,

-1: 집성 레벨 L의 PDCCH 후보군 인덱스-

= 0, ...,

-1: PDCCH candidate group index of aggregation level L

= 0, ...,

-1-

= 0, ...,

-One

,

,

,

,

,

-

,

,

,

,

,

: 단말 식별자-

: terminal identifier

값은 공통 탐색공간의 경우 0에 해당할 수 있다.

The value may correspond to 0 in the case of a common search space.

값은 단말-특정 탐색공간의 경우, 단말의 신원(C-RNTI 또는 기지국이 단말에게 설정해준 ID)과 시간 인덱스에 따라 변하는 값에 해당할 수 있다.

In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's identity (C-RNTI or ID set for the terminal by the base station) and the time index.

In 5G, as a plurality of search space sets may be set with different parameters (eg, parameters in Table 10), the set of search space sets monitored by the UE at every time point may vary. For example, if the search space set #1 is set to the X-slot period, the search space set #2 is set to the Y-slot period and X and Y are different, the UE searches with the search space set #1 in a specific slot. Both space set #2 can be monitored, and one of search space set #1 and search space set #2 can be monitored in a specific slot.

[PDCCH: span]

The UE may perform UE capability reporting for each subcarrier interval for the case of having a plurality of PDCCH monitoring positions within the slot, and in this case, the concept of Span may be used. Span means continuous symbols for the UE to monitor the PDCCH in the slot, and each PDCCH monitoring position is within one Span. Span can be expressed as (X,Y), where x means the minimum number of symbols that must be separated between the first symbols of two consecutive spans, and Y is the number of consecutive symbols that can monitor PDCCH within one span say At this time, the UE may monitor the PDCCH in the interval within the Y symbol from the first symbol of the Span in the Span.

5B is a diagram illustrating a case in which a terminal may have a plurality of PDCCH monitoring positions within a slot in a wireless communication system through a span. Span can be (X,Y) = (7,4), (4,3), (2,2), and in each of the three cases, (5-1-00), (5-1-05) in FIG. 5b ), (5-1-10). As an example, (5-1-00) represents a case in which two spans that can be expressed as (7,4) exist in the slot. The interval between the first symbols of two spans is expressed as X=7, and PDCCH monitoring positions may exist within a total of Y=3 symbols from the first symbol of each span, and search spaces 1 and 2 within Y=3 symbols indicates that each exists. As another example, in (5-1-05), a case in which a total of three spans that can be expressed as (4,3) exist within the slot, and the interval between the second and third spans is greater than X=4 A large X' = 5 symbols are shown.

[PDCCH: UE Capability Report]

The slot position in which the above-described common search space and terminal-specific search space are located is indicated by the monitoringSymbolsWitninSlot parameter in Table 11-1, and the symbol position in the slot is indicated by a bitmap through the monitoringSymbolsWithinSlot parameter in Table 9. On the other hand, the symbol position in the slot in which the terminal can monitor the search space may be reported to the base station through the following terminal capabilities (UE capabilities).

- Terminal capability 1 (hereinafter referred to as FG 3-1). This terminal capability is, as shown in Table 9a below, when one monitoring location (MO: monitoring occasion) for type 1 and type 3 common search space or terminal-specific search space exists in the slot, the corresponding MO location is the first in the slot. When located within the 3 symbol, it means the capability to monitor the corresponding MO. This terminal capability is a mandatory capability that all terminals supporting NR must support, and whether this capability is supported is not explicitly reported to the base station.

[Table 11-1]

- Terminal capability 2 (hereinafter referred to as FG 3-2). This terminal capability is, as shown in Table 11-2 below, when a monitoring location (MO: monitoring occasion) for a common search space or a terminal-specific search space exists in a slot, regardless of the location of the start symbol of the MO It refers to the ability to monitor. This terminal capability can be selectively supported by the terminal (optional), and whether this capability is supported is explicitly reported to the base station.

[Table 11-2]

- Terminal capability 3 (hereinafter referred to as FG 3-5, 3-5a, 3-5b). As shown in Table 11-3 below, this terminal capability indicates a pattern of a MO that the terminal can monitor when a plurality of monitoring occasions (MOs) for a common search space or a terminal-specific search space exist in a slot. do. The above-described pattern consists of an interval X between start symbols between different MOs, and a maximum symbol length Y for one MO. The combination of (X,Y) supported by the terminal may be one or a plurality of {(2,2), (4,3), (7,3)}. This terminal capability is selectively supported by the terminal (optional), and whether this capability is supported and the above-mentioned (X, Y) combination is explicitly reported to the base station.

[Table 11-3]

The terminal may report whether the above-described terminal capability 2 and/or terminal capability 3 is supported and related parameters to the base station. The base station may perform time axis resource allocation for the common search space and the terminal-specific search space based on the reported terminal capability. When allocating the resource, the base station may prevent the terminal from locating the MO in a location that cannot be monitored.

[PDCCH: BD/CCE limit]

When a plurality of search space sets are configured for the terminal, the following conditions may be considered in a method for determining the search space set to be monitored by the terminal.

If the UE receives the value of monitoringCapabilityConfig-r16, which is higher layer signaling, as r15monitoringcapability, the UE determines the number of PDCCH candidates that can be monitored and the total search space (here, the total search space corresponds to the union area of a plurality of search space sets). The maximum value for the number of CCEs constituting the entire CCE set) is defined for each slot, and if the value of monitoringCapabilityConfig-r16 is set to r16monitoringcapability, the UE can monitor the number of PDCCH candidates and Here, the maximum value of the number of CCEs constituting the entire search space (meaning the entire set of CCEs corresponding to the union region of a plurality of search space sets) is defined for each Span.

[Condition 1: Limit the maximum number of PDCCH candidates]

As described above, according to the set value of higher layer signaling, M ^μ , which is the maximum number of PDCCH candidates that the UE can monitor, is defined on a slot basis in a cell set with a subcarrier interval of 15·2 ^μ kHz. Table 12-1 According to the Span, if defined based on the span, it may follow Table 12-2 below.

[Table 12-1]

[Table 12-2]

[Condition 2: Limit the maximum number of CCEs]

As described above, according to the setting value of higher layer signaling, C ^μ , the maximum number of CCEs constituting the entire search space (here, the entire search space means the entire set of CCEs corresponding to the union region of a plurality of search space sets), is the sub In a cell set to a carrier spacing of 15·2 ^μ kHz, when defined based on a slot, Table 12-3 may be followed, and when defined based on a Span, Table 12-4 below may be followed.

[Table 12-3]

[Table 12-4]

For convenience of explanation, a situation in which both conditions 1 and 2 are satisfied at a specific time point is defined as “condition A”. Accordingly, not satisfying condition A may mean not satisfying at least one of conditions 1 and 2 above.

[PDCCH: Overbooking]

Depending on the setting of the search space sets of the base station, the condition A may not be satisfied at a specific time point. If condition A is not satisfied at a specific time point, the UE may select and monitor only some of the search space sets configured to satisfy condition A at the corresponding time point, and the base station may transmit the PDCCH to the selected search space set.

The following method may be followed as a method of selecting some search spaces from among the entire set of search spaces.

If the condition A for the PDCCH is not satisfied at a specific time point (slot), the UE (or the base station) selects a search space set in which the search space type is set as a common search space among the search space sets existing at the corresponding time point. - It can be selected in preference to a set of search spaces set as a specific search space.

When all search space sets set as the common search space are selected (that is, condition A is satisfied even after selecting all search spaces set as the common search space), the terminal (or the base station) uses the terminal-specific search space You can select search space sets set to . In this case, when there are a plurality of search space sets set as the terminal-specific search space, a search space set having a low search space set index may have a higher priority. In consideration of priority, UE-specific search space sets may be selected within a range in which condition A is satisfied.

[QCL, TCI state]

In a wireless communication system, one or more different antenna ports (or one or more channels, signals, and combinations thereof may be replaced, but in the description of the present disclosure in the future, for convenience, different antenna ports are collectively referred to) They may be associated with each other by setting a quasi co-location (QCL) as shown in [Table 13] below. The TCI state is for announcing the QCL relationship between the PDCCH (or PDCCH DMRS) and other RSs or channels. QCLed means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated from the antenna port A to the channel measurement from the antenna port B. QCL is based on 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) RRM (radio resource management) affected by average gain, and 4) spatial parameter. Depending on the situation, such as the affected BM (beam management), it may be necessary to correlate different parameters. Accordingly, NR supports four types of QCL relationships as shown in Table 13 below.

[Table 13]

The spatial RX parameter includes various parameters such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit/receive channel correlation, transmit/receive beamforming, spatial channel correlation, etc. Some or all of them may be collectively referred to.

The QCL relationship can be set to the UE through the RRC parameters TCI-State and QCL-Info as shown in Table 14 below. Referring to Table 14, the base station sets one or more TCI states to the UE and informs the UE of up to two QCL relationships (qcl-Type1, qcl-Type2) to the RS referring to the ID of the TCI state, that is, the target RS. . At this time, each QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 13 above. do.

[Table 14]

7 is a diagram illustrating an example of base station beam allocation according to TCI state configuration. Referring to FIG. 7 , the base station may transmit information on N different beams to the terminal through N different TCI states. For example, when N=3 as shown in FIG. 7 , the base station is associated with CSI-RS or SSB corresponding to different beams in which qcl-Type2 parameters included in three TCI states (700, 705, 710) are QCL type D It can be set to , so that the antenna ports referring to the different TCI states 700, 705, or 710 are associated with different spatial Rx parameters, that is, different beams.

Tables 15-1 to 15-5 below show valid TCI state settings according to target antenna port types.

Table 15-1 shows the valid TCI state configuration when the target antenna port is CSI-RS for tracking (TRS). The TRS means an NZP CSI-RS in which a repetition parameter is not set among CSI-RSs and trs-Info is set to true. In the case of setting 3 in Table 15-1, it can be used for aperiodic TRS.

[Table 15-1] Valid TCI state setting when the target antenna port is CSI-RS for tracking (TRS)

Table 15-2 shows the valid TCI state configuration when the target antenna port is CSI-RS for CSI. The CSI-RS for CSI refers to an NZP CSI-RS in which a parameter (eg, a repetition parameter) indicating repetition among CSI-RSs is not set and trs-Info is not set to true.

[Table 15-2] Valid TCI state setting when target antenna port is CSI-RS for CSI

Table 15-3 shows a valid TCI state configuration when the target antenna port is CSI-RS for beam management (BM, the same meaning as CSI-RS for L1 RSRP reporting). The CSI-RS for BM means an NZP CSI-RS in which a repetition parameter is set among CSI-RSs, has a value of On or Off, and trs-Info is not set to true.

[Table 15-3] Valid TCI state setting when the target antenna port is CSI-RS for BM (for L1 RSRP reporting)

Table 15-4 shows the valid TCI state configuration when the target antenna port is a PDCCH DMRS.

[Table 15-4] Valid TCI state setting when target antenna port is PDCCH DMRS

Table 15-5 shows the valid TCI state configuration when the target antenna port is a PDSCH DMRS.

[Table 15-5] Valid TCI state setting when target antenna port is PDSCH DMRS

In the representative QCL setting method according to Tables 15-1 to 15-5, the target antenna port and the reference antenna port for each step are set to "SSB" -> "TRS" -> "CSI-RS for CSI, or CSI-RS for BM". , or PDCCH DMRS, or PDSCH DMRS". Through this, it is possible to help the reception operation of the terminal by linking the statistical characteristics that can be measured from the SSB and the TRS to each antenna port.

[PDCCH: related to TCI state]

Specifically, TCI state combinations applicable to the PDCCH DMRS antenna port are shown in Table 15-6 below. In Table 15-6, the fourth row is a combination assumed by the UE before RRC configuration, and configuration after RRC is not possible.

[Table 15-6]

In NR, a hierarchical signaling method as shown in FIG. 8 is supported for dynamic allocation of a PDCCH beam. Referring to FIG. 8 , the base station may set N TCI states 805, 810, ..., 820 through the RRC signaling 800 to the terminal, and some of them may be set as the TCI state for CORESET. (825). Thereafter, the base station may indicate one of the TCI states (830, 835, 840) for CORESET to the terminal through MAC CE signaling (845). Thereafter, the UE receives the PDCCH based on beam information included in the TCI state indicated by the MAC CE signaling.

9 is a diagram illustrating a TCI indication MAC CE signaling structure for the PDCCH DMRS. 9, the TCI indication MAC CE signaling for the PDCCH DMRS consists of 2 bytes (16 bits), a serving cell ID of 5 bits (915), a CORESET ID of 4 bits (920), and a TCI state of 7 bits Contains ID 925.

10 is a diagram illustrating an example of beam configuration of a control resource set (CORESET) and a search space according to the above description. Referring to FIG. One may be indicated through MAC CE signaling (1005). After that, until another TCI state is indicated to the corresponding CORESET through another MAC CE signaling, the UE has the same QCL information (beam #1, 1005) in one or more search spaces (1010, 1015, 1020) connected to the CORESET. ) is considered to apply. The above-described PDCCH beam allocation method has a disadvantage in that it is difficult to indicate a beam change faster than the MAC CE signaling delay, and the same beam is collectively applied to all CORESETs regardless of search space characteristics, making flexible PDCCH beam operation difficult. there is Hereinafter, embodiments of the present invention provide a more flexible PDCCH beam configuration and operation method. Hereinafter, in describing an embodiment of the present invention, several distinguished examples are provided for convenience of description, but these are not mutually exclusive and may be applied by appropriately combining with each other according to circumstances.

The base station may set one or a plurality of TCI states for a specific control region to the terminal, and may activate one of the set TCI states through a MAC CE activation command. For example, {TCI state#0, TCI state#1, TCI state#2} is set as the TCI state in the control region #1, and the base station uses the TCI state as the TCI state for the control region #1 through the MAC CE. A command for activating to assume #0 may be transmitted to the terminal. Based on the activation command for the TCI state received by the MAC CE, the UE may correctly receive the DMRS of the corresponding control region based on QCL information in the activated TCI state.

For the control region (control region #0) in which the index is set to 0, if the UE does not receive the MAC CE activation command for the TCI state of the control region #0, the UE responds to the DMRS transmitted in the control region #0 It may be assumed that QCL with the SS/PBCH block identified in the initial access procedure or in the non-contention-based random access procedure that is not triggered by the PDCCH command.

With respect to the control region (control region #X) in which the index is set to a value other than 0, if the terminal has not received the TCI state for the control region #X set, or has received one or more TCI states set, but one of them is activated If the MAC CE activation command is not received, the UE may assume that it is QCLed with the SS/PBCH block identified in the initial access process with respect to the DMRS transmitted in the control region #X.

[PDCCH: QCL prioritization rule related]

Hereinafter, the QCL prioritization operation for the PDCCH will be described in detail.

The UE operates in a single cell or intra-band carrier aggregation, and a plurality of control resource sets existing within an activated bandwidth portion in a single or multiple cells have the same or different QCL-TypeD characteristics in a specific PDCCH monitoring period, and In case of overlap, the UE may select a specific control resource set according to the QCL prioritization operation and monitor control resource sets having the same QCL-TypeD characteristics as the corresponding control resource set. That is, when a plurality of control resource sets overlap in time, only one QCL-TypeD characteristic can be received. In this case, the criteria for determining the QCL priority may be as follows.

- Criterion 1. A set of control resources connected to the common search section of the lowest index in the cell corresponding to the lowest index among the cells including the common search section

- Criterion 2. In a cell corresponding to the lowest index among cells including the terminal-specific search period, a set of control resources connected to the terminal-specific search period of the lowest index

As described above, each of the above criteria applies the following criteria if the corresponding criteria is not met. For example, when control resource sets overlap in time in a specific PDCCH monitoring interval, if all control resource sets are not connected to a common search interval but to a UE-specific search interval, that is, if criterion 1 is not met, the UE can omit application of criterion 1 and apply criterion 2.

When the UE selects the control resource set according to the above-mentioned criteria, the following two items may be additionally considered for QCL information set in the control resource set. First, if control resource set 1 has CSI-RS 1 as a reference signal having a QCL-TypeD relationship, and this CSI-RS 1 has a QCL-TypeD relationship, a reference signal having a QCL-TypeD relationship is SSB 1, and another When the reference signal in which the control resource set 2 has a QCL-TypeD relationship is SSB 1, the UE may consider that the two control resource sets 1 and 2 have different QCL-TypeD characteristics. Second, if control resource set 1 has CSI-RS 1 set in cell 1 as a reference signal having a QCL-TypeD relationship, and this CSI-RS 1 has a QCL-TypeD relationship, the reference signal is SSB 1, control resource set 2 has CSI-RS 2 set in cell 2 as a reference signal having a QCL-TypeD relationship, and the reference signal in which CSI-RS 2 has a QCL-TypeD relationship is the same In case of SSB 1, the UE may consider that the two control resource sets have the same QCL-TypeD characteristic.

12 is a diagram for describing a method for a terminal to select a receivable control resource set in consideration of a priority when receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure. As an example, the UE may be configured to receive a plurality of control resource sets overlapping in time in a specific PDCCH monitoring period 1210 , and the plurality of control resource sets are a common search space or a UE-specific search space for a plurality of cells. may be connected with In the corresponding PDCCH monitoring period, the first control resource set 1215 connected to the first common search period may exist in the first bandwidth part 1200 of the first cell, and the first bandwidth part 1205 of the second cell ), the first control resource set 1220 connected to the first common discovery period and the second control resource set 1225 connected to the second terminal specific discovery period may exist. The control resource sets 1215 and 1220 have a relationship between the first CSI-RS resource and QCL-TypeD set in the first bandwidth part of the first cell, and the control resource set 1225 is the first bandwidth of the second cell. It may have a relationship between the first CSI-RS resource and QCL-TypeD set in the part. Therefore, if criterion 1 is applied to the corresponding PDCCH monitoring period 1210, all other control resource sets having the same QCL-TypeD reference signal as the first control resource set 1215 can be received. Accordingly, the UE may receive the control resource sets 1215 and 1220 in the corresponding PDCCH monitoring period 1210 . As another example, the terminal may be configured to receive a plurality of overlapping control resource sets in time in a specific PDCCH monitoring period 1240, and these plurality of control resource sets are a common search space or terminal specific for a plurality of cells. It may be connected to the search space. Within the corresponding PDCCH monitoring period, in the first bandwidth part 1230 of cell #1, the first control resource set 1245 connected to the first terminal specific discovery period and the second control resource set connected to the second terminal specific discovery period 1250 may exist, and in the first bandwidth portion 1235 of cell #2, the first control resource set 1255 connected to the first terminal specific search period and the second control resource connected to the third terminal specific search period A set 1260 may exist. The control resource sets 1245 and 1250 have a relationship between the first CSI-RS resource and QCL-TypeD set in the first bandwidth part of the first cell, and the control resource set 1255 is the first bandwidth of the second cell. Has a relationship between the first CSI-RS resource and QCL-TypeD set in the part, and the control resource set 1260 has a QCL-TypeD relationship with the second CSI-RS resource set in the first bandwidth part of the second cell. have. However, if criterion 1 is applied to the corresponding PDCCH monitoring period 1240 , since there is no common search period, criterion 2, which is the next criterion, may be applied. When criterion 2 is applied to the corresponding PDCCH monitoring period 1240 , all other control resource sets having the same QCL-TypeD reference signal as the control resource set 1245 can be received. Accordingly, the UE may receive the control resource sets 1245 and 1250 in the corresponding PDCCH monitoring period 1240 .

[Rate matching/Puncturing related]

Hereinafter, a rate matching operation and a puncturing operation will be described in detail.

When the time and frequency resource A to transmit the arbitrary symbol sequence A overlaps the arbitrary time and frequency resource B, rate matching or puncturing is performed with the transmission/reception operation of the channel A considering the resource C of the region where the resource A and the resource B overlap. action may be considered. The specific operation may follow the following contents.

Rate Matching Behavior

- The base station may map and transmit the channel A only for the remaining resource regions except for the resource C corresponding to the region overlapping the resource B among all the resources A to which the symbol sequence A is to be transmitted to the terminal. For example, symbol sequence A is composed of {symbol #1, symbol #2, symbol #3, symbol 4}, resource A is {resource #1, resource #2, resource #3, resource #4}, When B is {resource #3, resource #5}, the base station places a symbol sequence on {resource #1, resource #2, resource #4}, which is the remaining resources except for {resource #3} corresponding to resource C among resources A It can be sent by mapping A sequentially. As a result, the base station may map the symbol sequence {symbol #1, symbol #2, symbol #3} to {resource #1, resource #2, resource #4}, respectively, and transmit it.

The UE may determine the resource A and the resource B from the scheduling information for the symbol sequence A from the base station, and through this, the UE may determine the resource C, which is an area where the resource A and the resource B overlap. The UE may receive the symbol sequence A, assuming that the symbol sequence A is mapped and transmitted in the remaining region except for the resource C among all the resources A. For example, symbol sequence A is composed of {symbol #1, symbol #2, symbol #3, symbol 4}, resource A is {resource #1, resource #2, resource #3, resource #4}, When B is {resource #3, resource #5}, the terminal places a symbol sequence on {resource #1, resource #2, resource #4}, which are the remaining resources except for {resource #3} corresponding to resource C from among resource A It is assumed that A is sequentially mapped and can be received. As a result, the terminal assumes that the symbol sequence {symbol #1, symbol #2, symbol #3} is mapped to {resource #1, resource #2, resource #4} and transmitted, respectively, and performs a subsequent series of reception operations. can

Puncturing operation

The base station maps the symbol sequence A to the entire resource A when there is a resource C corresponding to the region overlapping the resource B among all the resources A to which the symbol sequence A is to be transmitted to the terminal, but transmission is performed in the resource region corresponding to the resource C. It is not performed, and transmission may be performed only for the remaining resource regions except for resource C among resource A. For example, symbol sequence A is composed of {symbol #1, symbol #2, symbol #3, symbol 4}, resource A is {resource #1, resource #2, resource #3, resource #4}, When B is {resource #3, resource #5}, the base station converts the symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} to resource A {resource #1, resource #2, resource # 3, resource #4} can be mapped respectively, and the symbol sequence corresponding to {resource#1, resource#2, resource#4}, which is the remaining resources except for {resource#3} corresponding to resource C, among resource A. Only symbol #1, symbol #2, and symbol #4} may be transmitted, and {symbol #3} mapped to {resource #3} corresponding to resource C may not be transmitted. As a result, the base station can map the symbol sequence {symbol #1, symbol #2, symbol #4} to {resource #1, resource #2, resource #4}, respectively, and transmit it.-

The UE may determine the resource A and the resource B from the scheduling information for the symbol sequence A from the base station, and through this, the UE may determine the resource C, which is an area where the resource A and the resource B overlap. The UE may receive the symbol sequence A, assuming that the symbol sequence A is mapped to the entire resource A and transmitted only in the remaining regions except for the resource C in the resource region A. For example, symbol sequence A is composed of {symbol #1, symbol #2, symbol #3, symbol 4}, resource A is {resource #1, resource #2, resource #3, resource #4}, If B is {resource #3, resource #5}, the terminal indicates that the symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} is resource A {resource #1, resource #2, resource # It can be assumed that each is mapped to 3, resource #4}, but {symbol #3} mapped to {resource #3} corresponding to resource C is not transmitted, and {resource #3 corresponding to resource C among resources A }, the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to {resource #1, resource #2, resource #4}, which are the remaining resources, may be assumed to be mapped and transmitted. As a result, the UE assumes that the symbol sequence {symbol #1, symbol #2, symbol #4} is mapped to {resource #1, resource #2, resource #4} and transmitted, respectively, and performs a subsequent series of reception operations. can

Hereinafter, a method of setting a rate matching resource for the purpose of rate matching in a 5G communication system will be described. Rate matching means that the size of the signal is adjusted in consideration of the amount of resources capable of transmitting the signal. For example, the rate matching of the data channel may mean that the size of data is adjusted accordingly without mapping and transmitting the data channel for a specific time and frequency resource region.

11 is a diagram for describing a method for a base station and a terminal to transmit and receive data in consideration of a downlink data channel and a rate matching resource.

11 shows a downlink data channel (PDSCH) 1101 and a rate matching resource 1102 . The base station may configure one or more rate matching resources 1102 through higher layer signaling (eg, RRC signaling) to the terminal. The rate matching resource 1102 configuration information may include time axis resource allocation information 1103 , frequency axis resource allocation information 1104 , and period information 1105 . In the following description, the bitmap corresponding to the frequency-axis resource allocation information 1104 corresponds to the "first bitmap", the bitmap corresponding to the time-base resource allocation information 1103 is the "second bitmap", and the period information 1105 corresponds to the The bitmap to be used is called "third bitmap". When all or part of the time and frequency resources of the scheduled data channel 1101 overlap with the set rate matching resource 602, the base station rate-matches the data channel 1101 in the rate matching resource 1102 part and transmits it. , the terminal may perform reception and decoding after assuming that the data channel 1101 is rate matched in the rate matching resource 1102 part.

The base station can dynamically notify the terminal through DCI whether to rate-match the data channel in the set rate matching resource part through additional configuration (corresponds to the "rate matching indicator" in the DCI format described above) . Specifically, the base station may select some of the set rate matching resources and group them into a rate matching resource group, and determine whether the data channel for each rate matching resource group has rate matching using a bitmap method to the terminal through DCI. can direct For example, if four rate matching resources, RMR#1, RMR#2, RMR#3, and RMR#4, are set, the base station as a rate matching group RMG#1={RMR#1, RMR#2}, RMG# 2 = {RMR#3, RMR#4} can be set, and using 2 bits in the DCI field, it is possible to indicate to the UE whether the rate is matched in RMG#1 and RMG#2, respectively, with a bitmap. For example, "1" may be indicated when rate matching is to be performed, and "0" may be indicated when rate matching is not to be performed.

In 5G, granularity of "RB symbol level" and "RE level" is supported as a method of setting the above-described rate matching resource in the terminal. More specifically, the following setting method may be followed.

RB symbol level

The UE may receive a maximum of 4 RateMatchPattern for each bandwidth part as upper layer signaling, and one RateMatchPattern may include the following content.

- As a reserved resource in the bandwidth part, a resource in which time and frequency resource regions of the corresponding reserved resource are set may be included in a combination of an RB-level bitmap and a symbol-level bitmap on the frequency axis. The reserved resource may span one or two slots. A time domain pattern (periodicityAndPattern) in which the time and frequency domains composed of each RB level and symbol level bitmap pair are repeated may be additionally set.

- A time and frequency domain resource region set as a control resource set in the bandwidth portion and a resource region corresponding to a time domain pattern set as a search space setting in which the resource region is repeated may be included.

RE level

The UE may receive the following contents configured through higher layer signaling.

- The number of ports (nrofCRS-Ports) and LTE-CRS-vshift(s) of LTE CRS as configuration information (lte-CRS-ToMatchAround) for RE corresponding to the LTE CRS (Cell-specific Reference Signal or Common Reference Signal) pattern (v-shift), the center subcarrier location information (carrierFreqDL) of the LTE carrier from the reference frequency point (eg reference point A), the bandwidth size of the LTE carrier (carrierBandwidthDL) information, MBSFN (Multicast-broadcast single) -frequency network) may include subframe configuration information (mbsfn-SubframConfigList) and the like. The UE may determine the location of the CRS in the NR slot corresponding to the LTE subframe based on the above-described information.

- It may include configuration information for a resource set corresponding to one or more ZP (Zero Power) CSI-RSs in the bandwidth part.

[LTE CRS rate match related]

Next, the rate match process for the above-described LTE CRS will be described in detail. For the coexistence of LTE (Long Term Evolution) and NR (New RAT) (LTE-NR Coexistence), NR provides a function for setting a CRS (Cell Specific Reference Signal) pattern of LTE to an NR terminal. More specifically, the CRS pattern may be provided by RRC signaling including at least one parameter in ServingCellConfig IE (Information Element) or ServingCellConfigCommon IE. Examples of the parameter may include lte-CRS-ToMatchAround, lte-CRS-PatternList1-r16, lte-CRS-PatternList2-r16, crs-RateMatch-PerCORESETPoolIndex-r16, and the like.

Rel-15 NR provides a function in which one CRS pattern can be configured per serving cell through the lte-CRS-ToMatchAround parameter. In Rel-16 NR, the above function has been expanded to enable setting of a plurality of CRS patterns per serving cell. More specifically, one CRS pattern per one LTE carrier may be configured in a single-TRP (transmission and reception point) configuration terminal, and two CRS patterns per one LTE carrier may be configured in a multi-TRP configuration terminal. could be set. For example, in the Single-TRP configuration terminal, up to three CRS patterns per serving cell can be configured through the lte-CRS-PatternList1-r16 parameter. For another example, a CRS may be configured for each TRP in the multi-TRP configuration terminal. That is, the CRS pattern for TRP1 may be set through the lte-CRS-PatternList1-r16 parameter, and the CRS pattern for TRP2 may be set through the lte-CRS-PatternList2-r16 parameter. On the other hand, when two TRPs are configured as described above, whether to apply both the CRS patterns of TRP1 and TRP2 to a specific PDSCH (Physical Downlink Shared Channel) or whether to apply only the CRS pattern for one TRP is crs-RateMatch-PerCORESETPoolIndex It is determined through the -r16 parameter. If the crs-RateMatch-PerCORESETPoolIndex-r16 parameter is set to enabled, only one TRP CRS pattern is applied, and in other cases, both TRP CRS patterns are applied.

Table 16 shows the ServingCellConfig IE including the CRS pattern, and Table 17 shows the RateMatchPatternLTE-CRS IE including at least one parameter for the CRS pattern.

[Table 16]

[Table 17]

[PDSCH: related to frequency resource allocation]

14 is a diagram illustrating an example of frequency-axis resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure.

14 is a diagram illustrating three frequency axis resource allocation methods: type 0 (14-00), type 1 (14-05), and dynamic switch (14-10) configurable through an upper layer in an NR wireless communication system It is a drawing showing the

Referring to FIG. 14, if the UE is configured to use only resource type 0 through higher layer signaling (14-00), some downlink control information (DCI) for allocating PDSCH to the UE is NRBG Contains a bitmap made up of bits. The conditions for this will be described again later. At this time, NRBG means the number of RBGs (resource block groups) determined as shown in [Table 18] below according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size, according to the bitmap. Data is transmitted to the RBG indicated by 1.

[Table 18]

개의 비트들로 구성되는 주파수 축 자원 할당 정보를 포함한다. 이를 위한 조건은 차후 다시 설명된다. 기지국은 이를 통하여 starting VRB(14-20)와 이로부터 연속적으로 할당되는 주파수 축 자원의 길이(14-25)를 설정할 수 있다.If the UE is configured to use only resource type 1 through higher layer signaling (14-05), some DCI for allocating PDSCH to the UE is

It includes frequency axis resource allocation information composed of bits. Conditions for this will be described again later. Through this, the base station can set the starting VRB 14-20 and the length 14-25 of the frequency axis resource continuously allocated therefrom.

If the UE is configured to use both resource type 0 and resource type 1 through higher layer signaling (14-10), some DCI for allocating PDSCH to the UE payload (14-15) for setting resource type 0 and frequency axis resource allocation information consisting of bits of a larger value (14-35) among payloads (14-20, 14-25) for setting resource type 1 and Conditions for this will be described again later. At this time, one bit may be added to the first part (MSB) of the frequency axis resource allocation information in DCI (14-30), and when the corresponding bit is a value of '0', it is indicated that resource type 0 is used, and '1' ', it may be indicated that resource type 1 is used.

[PDSCH/PUSCH: related to time resource allocation]

Hereinafter, a method of allocating time domain resources for a data channel in a next-generation mobile communication system (5G or NR system) will be described.

The base station provides a table for time domain resource allocation information for a downlink data channel (Physical Downlink Shared Channel, PDSCH) and an uplink data channel (Physical Uplink Shared Channel, PUSCH) to the terminal, and higher layer signaling (e.g. For example, RRC signaling) can be set. For PDSCH, a table including maxNrofDL-Allocations=16 entries may be configured, and for PUSCH, a table configured with maxNrofUL-Allocations=16 entries may be configured. In one embodiment, the time domain resource allocation information includes the PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted by K0. ), PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted by K2), the PDSCH or PUSCH within the slot Information on the position and length of the scheduled start symbol, a mapping type of PDSCH or PUSCH, etc. may be included. For example, information such as [Table 19] or [Table 20] below may be transmitted from the base station to the terminal.

[Table 19]

[Table 20]

The base station may notify one of the entries in the table for the above-described time domain resource allocation information to the terminal through L1 signaling (eg, DCI) (eg, to be indicated by the 'time domain resource allocation' field in DCI) can). The UE may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

15 is a diagram illustrating an example of time axis resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 15 , the base station sets subcarrier spacing (SCS) (μ _PDSCH , μ _PDCCH ) of a data channel and a control channel configured by using a higher layer, and a scheduling offset (scheduling). offset) (K0) value, and the OFDM symbol start position (15-00) and length (15-05) within one slot (15-10) dynamically indicated through DCI to indicate the time axis position of the PDSCH resource. can

16A is a diagram illustrating an example of time-base resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 16A , when the subcarrier intervals of the data channel and the control channel are the same (16-00, μ _PDSCH = μ _PDCCH ), since the slot numbers for data and control are the same, the base station and the terminal have previously A scheduling offset may be generated according to a predetermined slot offset K0. On the other hand, when the subcarrier spacing of the data channel and the control channel are different (16-05, μ _PDSCH ≠ μ _PDCCH ), since the slot numbers for data and control are different, the base station and the terminal have the subcarrier spacing of the PDCCH Based on , a scheduling offset may be generated according to a predetermined slot offset K0.

[PDSCH: processing time]

Next, the PDSCH processing time (PDSCH processing procedure time) will be described. When the base station schedules the terminal to transmit the PDSCH using DCI format 1_0, 1_1, or 1_2, the terminal transmits a transmission method indicated through DCI (modulation and demodulation and coding indication index (MCS), demodulation reference signal related information, time and It may require a PDSCH processing time for receiving the PDSCH by applying frequency resource allocation information, etc.). In NR, the PDSCH processing time is defined in consideration of this. The PDSCH processing time of the UE may follow Equation 3 below.

[Equation 3]

T _proc,1 = ( N ₁ + d _1,1 + d ₂ )( 2048 + 144 )κ2 ^-μ T _c + T _ext

Each variable in T _proc,1 described above with Equation 3 may have the following meaning.

-N ₁ : The number of symbols determined according to the terminal processing capability (UE processing capability) 1 or 2 and the numerology μ according to the capability of the terminal. When reported as terminal processing capability 1 according to the capability report of the terminal, it has the value of [Table x2-2], is reported as terminal processing capability 2, and when it is set through higher layer signaling that terminal processing capability 2 can be used [Table x2-2] 21]. Numerology μ may correspond to a minimum value among μ _PDCCH , μ _{PDSCH, and} μ _UL to maximize the T _proc,1 , and μ _PDCCH , μ _{PDSCH and} μ _UL are the neurology and schedule of the PDCCH for which PDSCH is scheduled, respectively. It may mean the numerology of the PDSCH and the UL channel through which the HARQ-ACK is to be transmitted.

[Table 21] PDSCH processing time in case of PDSCH processing capability 1

[Table 22] PDSCH processing time in case of PDSCH processing capability 2

- κ: 64

- T _ext : When the UE uses the shared spectrum channel access method, the UE may calculate T _ext and apply it to the PDSCH processing time. Otherwise, T _ext is assumed to be 0.

- If l ₁ indicating the PDSCH DMRS position value is 12, N1,0 of [Table x2-2] has a value of 14, otherwise it has a value of 13.

- For PDSCH mapping type A, the last symbol of the PDSCH is the i-th symbol in the slot in which the PDSCH is transmitted, and if i < 7, d _1,1 is 7-i, otherwise d _1,1 is 0.

- d ₂ : When the PUCCH having a high priority index and the PUCCH or the PUSCH having a low priority index overlap in time, d ₂ of the PUCCH having a high priority index may be set to a value reported by the UE. Otherwise d ₂ is 0.

- When PDSCH mapping type B is used for terminal processing capability 1, the value of d _1,1 is the number of symbols L, which is the number of symbols of the scheduled PDSCH, and the number of overlapping symbols between the PDCCH scheduling the PDSCH and the scheduled PDSCH as follows. can be decided.

- If L ≥ 7, then d _1,1 = 0.

- if L ≥ 4 and L ≤ 6, then d _1,1 = 7 - L.

- if L = 3, then d _1,1 = min (d, 1).

- if L = 2, then d _1,1 = 3 + d.

- When PDSCH mapping type B is used for UE processing capability 2, the value of d _1,1 is the number of symbols L, which is the number of symbols of the scheduled PDSCH, and the number of overlapping symbols between the PDCCH scheduling the PDSCH and the scheduled PDSCH as follows. can be decided.

- If L ≥ 7, then d _1,1 = 0.

- if L ≥ 4 and L ≤ 6, then d _1,1 = 7 - L.

- if L = 2,

- If a scheduled PDCCH exists in a CORESET consisting of three symbols, and the corresponding CORESET and the scheduled PDSCH have the same start symbol, d _1,1 = 3.

- otherwise, d _1,1 = d.

- In the case of a UE supporting capability 2 in a given serving cell, the PDSCH processing time according to UE processing capability 2 may be applied when the UE sets processingType2Enabled, which is higher layer signaling, to enable for the cell.

If the position of the _first uplink transmission symbol of the PUCCH including HARQ-ACK information is effect can be considered) If it does not start earlier than the first uplink transmission symbol that appears after a time of T _proc,1 from the last symbol of the PDSCH, the UE must transmit a valid HARQ-ACK message. That is, the UE must transmit the PUCCH including the HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the terminal cannot provide the base station with valid HARQ-ACK information corresponding to the scheduled PDSCH. The T- _proc,1 may be used for both normal or extended CP. If the PDSCH consists of two PDSCH transmission positions in one slot, d _1,1 is calculated based on the first PDSCH transmission position in the corresponding slot.

[PDSCH: Reception preparation time for cross-carrier scheduling]

In the case of cross-carrier scheduling, in which μ _PDCCH , which is a numerology, through which the scheduled PDCCH is transmitted, and μ _PDSCH , which is a numerology, in which a PDSCH scheduled through the corresponding PDCCH is transmitted, is different from each other, the UE defined for the time interval between the PDCCH and the PDSCH. The PDSCH reception preparation time of N- _pdsch will be described.

If μ _PDCCH < μ _PDSCH , the scheduled PDSCH cannot be transmitted earlier than the first symbol of a slot appearing after N _pdsch symbols from the last symbol of the PDCCH on which the PDSCH is scheduled. A transmission symbol of the corresponding PDSCH may include a DM-RS.

If μ _PDCCH > μ _PDSCH , the scheduled PDSCH may be transmitted after N _pdsch symbols from the last symbol of the PDCCH on which the corresponding PDSCH is scheduled. A transmission symbol of the corresponding PDSCH may include a DM-RS.

[Table 23] N _pdsch according to scheduled PDCCH subcarrier interval

[SRS Related]

Next, a method for estimating an uplink channel using a Sounding Reference Signal (SRS) transmission of the terminal will be described. The base station may configure at least one SRS configuration for each uplink BWP in order to transmit configuration information for SRS transmission to the terminal, and may also configure at least one SRS resource set for each SRS configuration. As an example, the base station and the terminal may exchange higher signaling information as follows in order to deliver information about the SRS resource set.

- srs-ResourceSetId: SRS resource set index

- srs-ResourceIdList: a set of SRS resource indexes referenced by the SRS resource set

-resourceType: This is the time axis transmission setting of the SRS resource referenced in the SRS resource set, and may be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. If it is set to 'periodic' or 'semi-persistent', the associated CSI-RS information may be provided according to the use of the SRS resource set. If set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information may be provided, and associated CSI-RS information may be provided according to the usage of the SRS resource set.

- usage: As a setting for the usage of the SRS resource referenced in the SRS resource set, it may be set to one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

- alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmit power of the SRS resource referenced in the SRS resource set.

The UE may understand that the SRS resource included in the set of SRS resource indexes referenced in the SRS resource set follows the information set in the SRS resource set.

In addition, the base station and the terminal may transmit and receive higher layer signaling information to deliver individual configuration information for the SRS resource. As an example, the individual configuration information for the SRS resource may include time-frequency axis mapping information within the slot of the SRS resource, which may include information about frequency hopping within the slot or between slots of the SRS resource. . In addition, the individual setting information for the SRS resource may include the time axis transmission setting of the SRS resource, and may be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This may be limited to have the same time axis transmission setting as the SRS resource set including the SRS resource. If the time axis transmission setting of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (eg, periodicityAndOffset) may be additionally included in the time axis transmission setting.

The base station activates or deactivates SRS transmission to the terminal through higher layer signaling including RRC signaling or MAC CE signaling, or L1 signaling (eg, DCI). For example, it can be triggered. The base station may activate or deactivate periodic SRS transmission through higher layer signaling to the terminal. The base station may instruct to activate the SRS resource set in which the resourceType is set periodically through higher layer signaling, and the terminal may transmit the SRS resource referenced in the activated SRS resource set. The time-frequency axis resource mapping in the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource, and the slot mapping including the transmission period and the slot offset follows the periodicityAndOffset set in the SRS resource. In addition, the spatial domain transmission filter applied to the SRS resource to be transmitted may refer to spatial relation info set in the SRS resource, or may refer to associated CSI-RS information set in the SRS resource set including the SRS resource. The UE may transmit the SRS resource within the uplink BWP activated for the periodic SRS resource activated through higher layer signaling.

For example, the base station may activate or deactivate semi-persistent SRS transmission through higher layer signaling to the terminal. The base station may instruct to activate the SRS resource set through MAC CE signaling, and the terminal may transmit the SRS resource referenced in the activated SRS resource set. The SRS resource set activated through MAC CE signaling may be limited to the SRS resource set in which the resourceType is set to semi-persistent. The time-frequency axis resource mapping in the slot of the SRS resource to be transmitted follows the resource mapping information set in the SRS resource, and the slot mapping including the transmission period and the slot offset follows the periodicityAndOffset set in the SRS resource. In addition, the spatial domain transmission filter applied to the SRS resource to be transmitted may refer to spatial relation info set in the SRS resource, or may refer to associated CSI-RS information set in the SRS resource set including the SRS resource. If spatial relation info is set in the SRS resource, the spatial domain transmission filter may be determined by referring to configuration information on spatial relation info delivered through MAC CE signaling that activates semi-persistent SRS transmission without following it. The UE may transmit the SRS resource in the uplink BWP activated for the semi-persistent SRS resource activated through higher layer signaling.

For example, the base station may trigger aperiodic SRS transmission to the terminal through DCI. The base station may indicate one of aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) through the SRS request field of DCI. The UE may understand that the SRS resource set including the aperiodic SRS resource trigger indicated through DCI in the aperiodic SRS resource trigger list is triggered among the configuration information of the SRS resource set. The UE may transmit the SRS resource referenced in the triggered SRS resource set. The time-frequency axis resource mapping in the slot of the SRS resource to be transmitted follows the resource mapping information set in the SRS resource. In addition, the slot mapping of the SRS resource to be transmitted may be determined through the slot offset between the PDCCH including DCI and the SRS resource, which may refer to the value(s) included in the slot offset set set in the SRS resource set. Specifically, the slot offset between the PDCCH including DCI and the SRS resource may apply a value indicated in the time domain resource assignment field of DCI among the offset value(s) included in the slot offset set set in the SRS resource set. In addition, the spatial domain transmission filter applied to the SRS resource to be transmitted may refer to spatial relation info set in the SRS resource, or may refer to associated CSI-RS information set in the SRS resource set including the SRS resource. The UE may transmit the SRS resource in the uplink BWP activated for the aperiodic SRS resource triggered through DCI.

When the base station triggers aperiodic SRS transmission to the terminal through DCI, in order for the terminal to transmit the SRS by applying the configuration information for the SRS resource, at least between the PDCCH including the DCI triggering the aperiodic SRS transmission and the transmitted SRS A time interval of (minimum time interval) may be required. The time interval for SRS transmission of the UE is the number of symbols between the first symbol to which the SRS resource transmitted first among the SRS resource(s) transmitted from the last symbol of the PDCCH including the DCI triggering the aperiodic SRS transmission is mapped. can The minimum time interval may be determined with reference to the PUSCH preparation procedure time required for the UE to prepare for PUSCH transmission. In addition, the minimum time interval may have a different value depending on the usage of the SRS resource set including the transmitted SRS resource. For example, the minimum time interval may be determined as an N2 symbol defined in consideration of the terminal processing capability according to the capability of the terminal with reference to the PUSCH preparation procedure time of the terminal. In addition, in consideration of the usage of the SRS resource set including the transmitted SRS resource, if the usage of the SRS resource set is set to 'codebook' or 'antennaSwitching', the minimum time interval is set to N2 symbols, and the usage of the SRS resource set is 'nonCodebook' Alternatively, when set to 'beamManagement', the minimum time interval can be set to N2+14 symbols. The UE transmits the aperiodic SRS when the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and when the time interval for aperiodic SRS transmission is smaller than the minimum time interval, ignores DCI triggering the aperiodic SRS. can

[Table 24]

The spatialRelationInfo configuration information in [Table 24] refers to one reference signal and applies the beam information of the reference signal to the beam used for the corresponding SRS transmission. For example, the setting of spatialRelationInfo may include information as shown in [Table 25] below.

[Table 25]

Referring to the spatialRelationInfo configuration, an SS/PBCH block index, a CSI-RS index, or an SRS index may be configured as an index of a reference signal to be referenced in order to use beam information of a specific reference signal. The upper signaling referenceSignal is configuration information indicating which reference signal beam information is to be referred to for the corresponding SRS transmission, ssb-Index is the index of the SS/PBCH block, csi-RS-Index is the index of the CSI-RS, and srs is the index of the SRS. each index. If the value of the upper signaling referenceSignal is set to 'ssb-Index', the UE may apply the reception beam used when receiving the SS/PBCH block corresponding to the ssb-Index as the transmission beam of the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the UE may apply the reception beam used when receiving the CSI-RS corresponding to the csi-RS-Index as the transmission beam of the corresponding SRS transmission. . If the value of the upper signaling referenceSignal is set to 'srs', the UE may apply the transmission beam used when transmitting the SRS corresponding to srs as the transmission beam of the corresponding SRS transmission.

[PUSCH: related to transmission method]

Next, a scheduling method of PUSCH transmission will be described. PUSCH transmission may be dynamically scheduled by a UL grant in DCI or may be operated by a configured grant Type 1 or Type 2. Dynamic scheduling indication for PUSCH transmission is possible in DCI format 0_0 or 0_1.

Configured grant Type 1 PUSCH transmission does not receive a UL grant in DCI, and can be semi-statically configured through reception of configuredGrantConfig including the rrc-ConfiguredUplinkGrant of [Table 26] through higher signaling. Configured grant Type 2 PUSCH transmission may be semi-continuously scheduled by the UL grant in DCI after reception of configuredGrantConfig that does not include the rrc-ConfiguredUplinkGrant of [Table 26] through upper signaling. When PUSCH transmission is operated by a configured grant, parameters applied to PUSCH transmission are [Except dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, scaling of UCI-OnPUSCH] Table 33] is applied through the upper signaling configuredGrantConfig. If the terminal receives the transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 26], the terminal applies tp-pi2BPSK in the pusch-Config of [Table 27] for PUSCH transmission operated by the configured grant.

[Table 26]

Next, a PUSCH transmission method will be described. The DMRS antenna port for PUSCH transmission is the same as the antenna port for SRS transmission. PUSCH transmission may follow a codebook-based transmission method and a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in pusch-Config of [Table x2-4], which is higher signaling, is 'codebook' or 'nonCodebook'.

As described above, PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1, and may be semi-statically configured by a configured grant. If the UE is instructed to schedule PUSCH transmission through DCI format 0_0, the UE uses the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID in the uplink BWP activated in the serving cell. A beam configuration for transmission is performed, and in this case, PUSCH transmission is based on a single antenna port. The UE does not expect scheduling for PUSCH transmission through DCI format 0_0 within the BWP in which the PUCCH resource including the pucch-spatialRelationInfo is not configured. If the UE has not configured txConfig in pusch-Config of [Table 27], the UE does not expect to be scheduled in DCI format 0_1.

[Table 27]

Next, codebook-based PUSCH transmission will be described. Codebook-based PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1, and may operate semi-statically by a configured grant. When the codebook-based PUSCH is dynamically scheduled by DCI format 0_1 or is set semi-statically by a configured grant, the UE has an SRS Resource Indicator (SRI), a Transmission Precoding Matrix Indicator (TPMI), and a transmission rank (PUSCH of the transport layer). number) to determine a precoder for PUSCH transmission.

At this time, the SRI may be given through a field SRS resource indicator in DCI or may be configured through srs-ResourceIndicator, which is higher signaling. The UE is configured with at least one SRS resource when transmitting a codebook-based PUSCH, and may be configured with up to two. When the UE is provided with an SRI through DCI, the SRS resource indicated by the corresponding SRI means an SRS resource corresponding to the SRI among SRS resources transmitted before the PDCCH including the corresponding SRI. In addition, TPMI and transmission rank may be given through fields precoding information and number of layers in DCI or may be set through higher signaling, precodingAndNumberOfLayers. TPMI is used to indicate a precoder applied to PUSCH transmission. If the UE receives one SRS resource configured, the TPMI is used to indicate a precoder to be applied in the configured one SRS resource. If the UE is configured with a plurality of SRS resources, the TPMI is used to indicate a precoder to be applied in the SRS resource indicated through the SRI.

A precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in SRS-Config, which is higher signaling. In codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and codebookSubset in the higher signaling, pusch-Config. CodebookSubset in pusch-Config, which is higher signaling, may be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the UE to the base station. If the UE reports 'partialAndNonCoherent' as UE capability, the UE does not expect that the value of codebookSubset, which is higher level signaling, is set to 'fullyAndPartialAndNonCoherent'. Also, if the UE reports 'nonCoherent' as UE capability, the UE does not expect that the value of codebookSubset, which is higher signaling, is set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. When nrofSRS-Ports in SRS-ResourceSet, which is higher signaling, points to two SRS antenna ports, the UE does not expect that the value of codebookSubset, which is upper signaling, is set to 'partialAndNonCoherent'.

The terminal may receive one SRS resource set in which the value of usage in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource in the corresponding SRS resource set may be indicated through SRI. If several SRS resources are set in the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal sets the value of nrofSRS-Ports in the upper signaling SRS-Resource to the same value for all SRS resources expect this to be set.

The terminal transmits one or a plurality of SRS resources included in the SRS resource set in which the value of usage is set to 'codebook' according to higher level signaling to the base station, and the base station selects one of the SRS resources transmitted by the terminal and selects the corresponding SRS Instructs the UE to perform PUSCH transmission by using the transmission beam information of the resource. At this time, in codebook-based PUSCH transmission, SRI is used as information for selecting an index of one SRS resource and is included in DCI. Additionally, the base station includes information indicating the TPMI and rank to be used by the UE for PUSCH transmission in the DCI. The UE uses the SRS resource indicated by the SRI to perform PUSCH transmission by applying the rank indicated based on the transmission beam of the SRS resource and the precoder indicated by the TPMI.

Next, non-codebook-based PUSCH transmission will be described. Non-codebook-based PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1, and may operate semi-statically by a configured grant. When at least one SRS resource is set in the SRS resource set in which the value of usage in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE may be scheduled for non-codebook-based PUSCH transmission through DCI format 0_1.

For the SRS resource set in which the value of usage in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE may be configured with one connected NZP CSI-RS resource (non-zero power CSI-RS). The UE may perform the calculation of the precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of aperiodic SRS transmission in the terminal is less than 42 symbols, the terminal updates the information on the precoder for SRS transmission don't expect to be

When the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the connected NZP CSI-RS is indicated by the SRS request, which is a field in DCI format 0_1 or 1_1. At this time, if the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the connected NZP CSI-RS exists when the value of the field SRS request in DCI format 0_1 or 1_1 is not '00' will point to In this case, the DCI should not indicate cross carrier or cross BWP scheduling. In addition, if the value of the SRS request indicates the existence of the NZP CSI-RS, the corresponding NZP CSI-RS is located in the slot in which the PDCCH including the SRS request field is transmitted. At this time, the TCI states set in the scheduled subcarrier are not set to QCL-TypeD.

If a periodic or semi-persistent SRS resource set is configured, the connected NZP CSI-RS may be indicated through the associatedCSI-RS in the upper signaling SRS-ResourceSet. For non-codebook-based transmission, the UE does not expect that spatialRelationInfo, which is upper signaling for SRS resource, and associatedCSI-RS in SRS-ResourceSet, which is higher signaling, are set together.

When a plurality of SRS resources are configured, the UE may determine a precoder to be applied to PUSCH transmission and a transmission rank based on the SRI indicated by the base station. In this case, the SRI may be indicated through a field SRS resource indicator in DCI or may be configured through srs-ResourceIndicator, which is higher signaling. As with the above-described codebook-based PUSCH transmission, when the UE receives an SRI through DCI, the SRS resource indicated by the SRI is the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the SRI. it means. The terminal can use one or a plurality of SRS resources for SRS transmission, and the maximum number of SRS resources and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol in one SRS resource set are determined by the UE capability reported by the terminal to the base station. it is decided At this time, the SRS resources simultaneously transmitted by the UE occupy the same RB. The UE configures one SRS port for each SRS resource. Only one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook' can be set, and up to four SRS resources for non-codebook-based PUSCH transmission can be set.

The base station transmits one NZP-CSI-RS connected to the SRS resource set to the terminal, and the terminal receives the NZP-CSI-RS based on the measurement result, one or a plurality of SRS resources in the corresponding SRS resource set. Calculate the precoder to be used for transmission. The terminal applies the calculated precoder when transmitting one or a plurality of SRS resources in the SRS resource set in which usage is set to 'nonCodebook' to the base station, and the base station applies one or more of the received one or a plurality of SRS resources Select SRS resource. In this case, in non-codebook-based PUSCH transmission, the SRI indicates an index capable of expressing one or a combination of a plurality of SRS resources, and the SRI is included in the DCI. At this time, the number of SRS resources indicated by the SRI transmitted by the base station may be the number of transmission layers of the PUSCH, and the UE transmits the PUSCH by applying a precoder applied to SRS resource transmission to each layer.

[PUSCH: prep time]

Next, a PUSCH preparation procedure time will be described. When the base station schedules the terminal to transmit the PUSCH using DCI format 0_0, 0_1, or 0_2, the terminal transmits a transmission method indicated through DCI (transmission precoding method of SRS resource, number of transmission layers, spatial domain transmission filter) A PUSCH preparation process time for transmitting a PUSCH by applying . In NR, the PUSCH preparation process time is defined in consideration of this. The UE's PUSCH preparation time may follow Equation 4 below.

[Equation 4]

T _proc,2 = max(( N ₂ + d _2,1 + d ₂ )( 2048 + 144 )κ2 ^-μ T _c + T _ext + T _switch , d _2,2 )

Each variable in T _proc,2 described above by Equation 4 may have the following meaning.

-N ₂ : The number of symbols determined according to the terminal processing capability (UE processing capability) 1 or 2 and the numerology μ according to the capability of the terminal. When reported as terminal processing capability 1 according to the capability report of the terminal, it has the value of [Table 28], is reported as terminal processing capability 2, and it is set through higher layer signaling that terminal processing capability 2 can be used [Table 29] can have a value of

[Table 28]

[Table 29]

-d _2,1 : The number of symbols set to 0 when all resource elements of the first OFDM symbol of PUSCH transmission are configured to consist only of DM-RS, and set to 1 when not.

- κ: 64

또는

중, T_proc,2이 더 크게 되는 값을 따른다.

은 PUSCH를 스케줄링 하는 DCI가 포함된 PDCCH가 전송되는 하향링크의 뉴머롤로지를 뜻하고,

은 PUSCH가 전송되는 상향링크의 뉴머롤로지를 뜻한다.- μ:

or

In the middle, T _proc,2 follows the larger value.

denotes the numerology of the downlink in which the PDCCH including the DCI for scheduling the PUSCH is transmitted,

denotes the numerology of the uplink through which the PUSCH is transmitted.

,

,

를 가진다.- T _c :

,

,

have

-d _2,2 : When the DCI scheduling PUSCH indicates BWP switching, the BWP switching time is followed, otherwise, it has 0.

- d ₂ : When OFDM symbols of PUCCH and PUSCH having high priority index and PUCCH having low priority index overlap in time, d ₂ value of PUSCH having high priority index is used. Otherwise d ₂ is 0.

- T _ext : When the UE uses the shared spectrum channel access method, the UE may calculate T _ext and apply it to the PUSCH preparation time. Otherwise, T _ext is assumed to be 0.

- T _switch : When the uplink switching interval is triggered, T _switch is assumed to be the switching interval time. Otherwise, 0 is assumed.

The base station and the terminal consider the influence of the time axis resource mapping information of the PUSCH scheduled through DCI and the uplink-downlink timing advance, from the last symbol of the PDCCH including the DCI scheduling the PUSCH to T _proc,2 after If the first symbol of the PUSCH starts earlier than the first uplink symbol that the CP starts, it is determined that the PUSCH preparation process time is not sufficient. If not, the base station and the terminal determine that the PUSCH preparation process time is sufficient. The UE transmits the PUSCH only when the PUSCH preparation time is sufficient, and when the PUSCH preparation time is not sufficient, the UE may ignore DCI for scheduling the PUSCH.

[PUSCH: related to repeated transmission]

Hereinafter, repeated transmission of an uplink data channel in a 5G system will be described in detail. In the 5G system, two types of repetitive transmission methods of the uplink data channel are supported: PUSCH repetitive transmission type A and PUSCH repetitive transmission type B. The UE may receive one of PUSCH repeated transmission types A or B configured by higher layer signaling.

PUSCH repeated transmission type A

- As described above, the symbol length and the position of the start symbol of the uplink data channel are determined by the time domain resource allocation method in one slot, and the base station sets the number of repeated transmissions by upper layer signaling (eg, RRC signaling) or L1 signaling ( For example, the terminal may be notified through DCI.

- The terminal may repeatedly transmit an uplink data channel having the same start symbol as the length of the uplink data channel set based on the number of repeated transmissions received from the base station in consecutive slots. At this time, if at least one symbol among the slots set by the base station as downlink to the terminal or symbols of the uplink data channel configured by the terminal is set as downlink, the terminal omits uplink data channel transmission, but uplink The number of repeated transmissions of the data channel is counted.

PUSCH repeated transmission type B

- As described above, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method in one slot, and the base station sets the number of repeated transmissions numberofrepetitions in upper signaling (eg, RRC signaling) or L1 signaling (eg, DCI) to notify the UE.

에 의해 주어지고 그 슬롯에서 시작하는 심볼은

에 의해 주어진다. n번째 nominal repetition이 끝나는 슬롯은

에 의해 주어지고 그 슬롯에서 끝나는 심볼은

에 의해 주어진다. 여기서 n=0,..., numberofrepetitions-1 이고 S는 설정 받은 상향링크 데이터 채널의 시작 심볼 L은 설정 받은 상향링크 데이터 채널의 심볼 길이를 나타낸다.

는 PUSCH 전송이 시작하는 슬롯을 나타내고

슬롯당 심볼의 수를 나타낸다. - Based on the first set start symbol and length of the uplink data channel, the nominal repetition of the uplink data channel is determined as follows. The slot where the nth nominal repetition begins is

The symbol given by and starting in that slot is

is given by The slot where the nth nominal repetition ends is

The symbol given by and ending in that slot is

is given by Here, n=0,..., numberofrepetitions-1, where S is the start symbol of the configured uplink data channel, and L represents the symbol length of the configured uplink data channel.

denotes a slot in which PUSCH transmission starts

Indicates the number of symbols per slot.

- The UE determines an invalid symbol for PUSCH repeated transmission type B. A symbol configured for downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated is determined as an invalid symbol for PUSCH repeated transmission type B. Additionally, invalid symbols can be set in higher layer parameters (eg InvalidSymbolPattern). Higher layer parameters (eg InvalidSymbolPattern) provide a symbol level bitmap spanning one or two slots so that invalid symbols can be set. In the bitmap, 1 represents an invalid symbol. Additionally, the period and pattern of the bitmap may be set through a higher layer parameter (eg, periodicityAndPattern). If a higher layer parameter (eg, InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the terminal applies an invalid symbol pattern, and if the parameter indicates 0, the terminal does not apply the invalid symbol pattern. If a higher layer parameter (eg, InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not set, the terminal applies an invalid symbol pattern.

After the invalid symbol is determined, for each nominal repetition, the terminal may consider symbols other than the invalid symbol as valid symbols. If more than one valid symbol is included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Here, each actual repetition includes a continuous set of valid symbols that can be used for PUSCH repetitive transmission type B in one slot.

16B is a diagram illustrating an example of repeated PUSCH transmission type B in a wireless communication system according to an embodiment of the present disclosure. The UE may set the start symbol S of the uplink data channel to 0, the length L of the uplink data channel to 14, and set the number of repeated transmissions to 16. In this case, Nominal repetition is indicated in 16 consecutive slots (1601). Thereafter, the terminal may determine that the symbol set as the downlink symbol in each nominal repetition 1601 is an invalid symbol. Also, the terminal determines the symbols set to 1 in the invalid symbol pattern 1602 as invalid symbols. In each nominal repetition, when valid symbols, not invalid symbols, are composed of one or more consecutive symbols in one slot, the actual repetition is set and transmitted (1603).

In addition, with respect to repeated PUSCH transmission, in NR Release 16, the following additional methods may be defined for UL grant-based PUSCH transmission and configured grant-based PUSCH transmission beyond the slot boundary.

- Method 1 (mini-slot level repetition): Through one UL grant, two or more PUSCH repeated transmissions are scheduled within one slot or beyond the boundary of consecutive slots. Also, for method 1, time domain resource allocation information in DCI indicates a resource of the first repeated transmission. In addition, time domain resource information of the first repeated transmission and time domain resource information of the remaining repetitive transmissions may be determined according to the uplink or downlink direction determined for each symbol of each slot. Each repeated transmission occupies consecutive symbols.

- Method 2 (multi-segment transmission): Two or more repeated PUSCH transmissions are scheduled in consecutive slots through one UL grant. In this case, one transmission is designated for each slot, and different starting points or repetition lengths may be different for each transmission. In addition, in method 2, time domain resource allocation information in DCI indicates a start point and repetition length of all repeated transmissions. In addition, in the case of performing repeated transmission in a single slot through method 2, if there are several bundles of consecutive uplink symbols in the corresponding slot, each repeated transmission is performed for each bundle of uplink symbols. If a bundle of consecutive uplink symbols is uniquely present in the corresponding slot, one PUSCH repeated transmission is performed according to the method of NR Release 15.

- Method 3: Two or more repeated PUSCH transmissions are scheduled in consecutive slots through two or more UL grants. In this case, one transmission is designated for each slot, and the n-th UL grant may be received before the PUSCH transmission scheduled by the n-1 th UL grant ends.

- Method 4: Through one UL grant or one configured grant, one or several repeated PUSCH transmissions in a single slot, or two or more repeated PUSCH transmissions across the boundary of consecutive slots can be supported. . The number of repetitions indicated by the base station to the terminal is only a nominal value, and the number of repeated PUSCH transmissions actually performed by the terminal may be greater than the nominal number of repetitions. The time domain resource allocation information in DCI or in the configured grant means the resource of the first repeated transmission indicated by the base station. Time domain resource information of the remaining repeated transmission may be determined by referring to at least resource information of the first repeated transmission and the uplink or downlink direction of the symbols. If the time domain resource information of the repeated transmission indicated by the base station spans the slot boundary or includes an uplink/downlink switching point, the repeated transmission may be divided into a plurality of repeated transmissions. In this case, one repeated transmission may be included for each uplink period in one slot.

[PUSCH: Frequency Hopping Process]

Hereinafter, frequency hopping of an uplink data channel (Physical Uplink Shared Channel; PUSCH) in a 5G system will be described in detail.

In 5G, as a frequency hopping method of an uplink data channel, two methods are supported for each PUSCH repetition transmission type. First, PUSCH repetitive transmission type A supports intra-slot frequency hopping and inter-slot frequency hopping, and PUSCH repetitive transmission type B supports inter-repetition frequency hopping and inter-slot frequency hopping.

The intra-slot frequency hopping method supported by the PUSCH repeated transmission type A is a method in which the UE changes the allocated resources of the frequency domain by a set frequency offset in two hops within one slot and transmits the same. In intra-slot frequency hopping, the start RB of each hop may be expressed by Equation (4).

[Equation 4]

는 UL BWP안에서 시작 RB를 나타내고 주파수 자원 할당 방법으로부터 계산된다.

은 상위 계층 파라미터를 통해 두개의 홉 사이에 주파수 오프셋을 나타난다. 첫번째 홉의 심볼 수는

로 나타낼 수 있고, 두번째 홉의 심볼 수는

으로 나타낼 수 있다.

은 한 슬롯 내에서의 PUSCH 전송의 길이로, OFDM 심볼 수로 나타난다. In Equation 4, i = 0 and i = 1 represent the first hop and the second hop, respectively,

denotes the start RB in the UL BWP and is calculated from the frequency resource allocation method.

indicates the frequency offset between the two hops through the upper layer parameter. The number of symbols in the first hop is

can be expressed as , and the number of symbols in the second hop is

can be expressed as

is the length of PUSCH transmission in one slot, and is represented by the number of OFDM symbols.

슬롯 동안 시작 RB는 수학식 5를 통해 나타낼 수 있다.Next, the inter-slot frequency hopping method supported by the repeated PUSCH transmission types A and B is a method in which the UE changes the allocated resource of the frequency domain for each slot by a set frequency offset and transmits the same. In inter-slot frequency hopping

The starting RB during the slot may be expressed through Equation 5.

[Equation 5]

는 multi-slot PUSCH 전송에서 현재 슬롯 번호,

는 UL BWP안에서 시작 RB를 나타내고 주파수 자원 할당 방법으로부터 계산된다.

은 상위 계층 파라미터를 통해 두개의 홉 사이에 주파수 오프셋을 나타낸다.In Equation 5,

is the current slot number in multi-slot PUSCH transmission,

denotes the start RB in the UL BWP and is calculated from the frequency resource allocation method.

denotes a frequency offset between two hops through a higher layer parameter.

Next, the inter-repetition frequency hopping method supported by the PUSCH repetitive transmission type B is to transmit a resource allocated in the frequency domain for one or a plurality of actual repetitions within each nominal repetition by moving it by a set frequency offset. RB _start (n), which is the index of the start RB on the frequency domain for one or a plurality of actual repetitions within the nth nominal repetition, may follow Equation 6 below.

[Equation 6]

은 상위 계층 파라미터를 통해 두 개의 홉 사이에 RB 오프셋을 나타낸다.In Equation 6, n is the index of nominal repetition,

indicates the RB offset between two hops through a higher layer parameter.

[PUSCH: multiplexing rule when AP/SP CSI reporting]

Hereinafter, a method of measuring and reporting a channel state in a 5G communication system will be described in detail. Channel state information (channel state information, CSI) includes a channel quality indicator (channel quality information, CQI), a precoding matrix index (precoding matrix indicator, PMI), a CSI-RS resource indicator (CSI-RS resource indicator, CRI), SS / PBCH block resource indicator (SS / PBCH block resource indicator, SSBRI), layer indicator (layer indicator, LI), rank indicator (rank indicator, RI), and / or L1-RSRP (Reference Signal Received Power), etc. may be included. have. The base station may control the time and frequency resources for the above-described CSI measurement and report of the terminal.

For the above-described CSI measurement and reporting, the UE sets information for N (≥1) CSI reporting (CSI-ReportConfig), M (≥1) RS transmission resource setting information (CSI-ResourceConfig) , one or two trigger state (CSI-AperiodicTriggerStateList, CSI-SemiPersistentOnPUSCH-TriggerStateList) list information may be configured through higher layer signaling. The configuration information for the above-described CSI measurement and reporting may be as follows described in [Table 30] to [Table 36] in more detail.

[Table 30] CSI-ReportConfig

The IE CSI-ReportConfig is used to configure a periodic or semi-persistent report sent on PUCCH on the cell in which the CSI-ReportConfig is included, or to configure a semi-persistent or aperiodic report sent on PUSCH triggered by DCI received on the cell in which the CSI-ReportConfig is included (in this case, the cell on which the report is sent is determined by the received DCI). See TS 38.214 [19], clause 5.2.1.

CSI-ReportConfig information element

[Table 31] CSI-ResourceConfig

The IE CSI-ResourceConfig defines a group of one or more NZP-CSI-RS-ResourceSet, CSI-IM-ResourceSet and/or CSI-SSB-ResourceSet.

CSI-ResourceConfig information element

[Table 32] NZP-CSI-RS-ResourceSet

The IE NZP-CSI-RS-ResourceSet is a set of Non-Zero-Power (NZP) CSI-RS resources (their IDs) and set-specific parameters.

NZP-CSI-RS-ResourceSet information element

[Table 33] CSI-SSB-ResourceSet

The IE CSI-SSB-ResourceSet is used to configure one SS/PBCH block resource set which refers to SS/PBCH as indicated in ServingCellConfigCommon.

CSI-SSB-ResourceSet information element

[Table 34] CSI-IM-ResourceSet

The IE CSI-IM-ResourceSet is used to configure a set of one or more CSI Interference Management (IM) resources (their IDs) and set-specific parameters.

CSI-IM-ResourceSet information element

[Table 35] CSI-AperiodicTriggerStateList

The CSI-AperiodicTriggerStateList IE is used to configure the UE with a list of aperiodic trigger states. Each codepoint of the DCI field "CSI request" is associated with one trigger state. Upon reception of the value associated with a trigger state, the UE will perform measurement of CSI-RS (reference signals) and aperiodic reporting on L1 according to all entries in the associatedReportConfigInfoList for that trigger state.

CSI-AperiodicTriggerStateList information element

[Table 36] CSI-SemiPersistentOnPUSCH-TriggerStateList

The CSI-SemiPersistentOnPUSCH-TriggerStateList IE is used to configure the UE with list of trigger states for semi-persistent reporting of channel state information on L1. See also TS 38.214 [19], clause 5.2.

CSI-SemiPersistentOnPUSCH-TriggerStateList information element

For the above-described CSI reporting setting (CSI-ReportConfig), each reporting setting CSI-ReportConfig is a CSI resource setting associated with the corresponding report setting, a higher layer parameter bandwidth portion identifier (bwp-id) given by CSI-ResourceConfig. It may be associated with one identified downlink (DL) bandwidth portion. As a time domain reporting operation for each report setting CSI-ReportConfig, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, which are based on the reportConfigType parameter set from the upper layer. by the base station to the terminal. The semi-persistent CSI reporting method supports 'PUCCH-based semi-persistent (semi-PersistentOnPUCCH)' and 'PUSCH-based semi-persistent (semi-PersistentOnPUSCH)'. In the case of the periodic or semi-permanent CSI reporting method, the UE may receive a PUCCH or PUSCH resource for transmitting CSI from the base station through higher layer signaling. The period and slot offset of a PUCCH or PUSCH resource for transmitting CSI may be given as a numerology of an uplink (UL) bandwidth portion configured to transmit a CSI report. In the case of the aperiodic CSI reporting method, the UE may receive a PUSCH resource for transmitting CSI from the base station through L1 signaling (the DCI format 0_1 described above).

For the above-described CSI resource setting (CSI-ResourceConfig), each CSI resource setting CSI-ReportConfig may include S (≥1) CSI resource sets (given as a higher layer parameter csi-RS-ResourceSetList). The CSI resource set list is composed of a non-zero power (NZP) CSI-RS resource set and an SS/PBCH block set, or a CSI-interference measurement (CSI-IM) resource set. can Each CSI resource setting may be located in a downlink (DL) bandwidth portion identified by a higher layer parameter bwp-id, and the CSI resource setting may be linked to a CSI reporting setting of the same downlink bandwidth portion. The time domain operation of the CSI-RS resource in the CSI resource setting may be set to one of 'aperiodic', 'periodic', or 'semi-permanent' from a higher layer parameter resourceType. For periodic or semi-permanent CSI resource setting, the number of CSI-RS resource sets may be limited to S=1, and the configured period and slot offset may be given as a numerology of a downlink bandwidth portion identified by bwp-id. The UE may receive one or more CSI resource settings for channel or interference measurement from the base station through higher layer signaling, and may include, for example, the following CSI resources.

- CSI-IM resource for interference estimation

- NZP CSI-RS resource for interference measurement

- NZP CSI-RS resource for channel measurement

For CSI-RS resource sets associated with a resource setting in which the upper layer parameter resourceType is set to 'aperiodic', 'periodic', or 'semi-permanent', reportType is set to 'aperiodic' For CSI reporting settings A trigger state and a resource setting for channel or interference measurement for one or more component cells (CC) may be set as a higher layer parameter CSI-AperiodicTriggerStateList.

Aperiodic CSI reporting of the UE may use PUSCH, periodic CSI reporting may use PUCCH, and semi-permanent CSI reporting when triggered or activated by DCI PUSCH, MAC control element (MAC control element, After being activated by MAC CE), it may be performed using PUCCH. As described above, the CSI resource setting may also be set aperiodically, periodically, or semi-permanently. The combination between the CSI reporting setting and the CSI resource setting may be supported based on the following [Table 37].

[Table 37]

Table 5.2.1.4-1: Triggering/Activation of CSI Reporting for the possible CSI-RS Configurations.

The aperiodic CSI report may be triggered by the "CSI request" field of the aforementioned DCI format 0_1 corresponding to the scheduling DCI for the PUSCH. The UE may monitor the PDCCH, obtain DCI format 0_1, and obtain scheduling information for PUSCH and a CSI request indicator. The CSI request indicator may be set to NTS (=0, 1, 2, 3, 4, 5, or 6) bits, and may be determined by higher layer signaling (reportTriggerSize). One trigger state among one or a plurality of aperiodic CSI reporting trigger states that may be configured as higher layer signaling (CSI-AperiodicTriggerStateList) may be triggered by the CSI request indicator.

- When all bits of the CSI request field are 0, this may mean that no CSI report is requested.

- If the number (M) of CSI trigger states in the set CSI-AperiodicTriggerStateLite is greater than 2NTs-1, according to a predefined mapping relationship, M CSI trigger states may be mapped to 2NTs-1, and of 2NTs-1 One of the trigger states may be indicated by the CSI request field.

- If the number (M) of CSI trigger states in the configured CSI-AperiodicTriggerStateLite is less than or equal to 2NTs-1, one of the M CSI trigger states may be indicated by the CSI request field.

The following [Table 38] shows an example of a relationship between a CSI request indicator and a CSI trigger state that may be indicated by the corresponding indicator.

[Table 38]

The UE may perform measurement on the CSI resource in the CSI trigger state triggered by the CSI request field, and from this, at least one or more of CSI (the aforementioned CQI, PMI, CRI, SSBRI, LI, RI, or L1-RSRP, etc.) including) can be created. The UE may transmit the acquired CSI using the PUSCH scheduled by the corresponding DCI format 0_1. When 1 bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 indicates “1”, uplink data (UL-SCH) and acquired CSI are transmitted to PUSCH resources scheduled by DCI format 0_1. It can be transmitted by multiplexing. When 1 bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 indicates "0", only CSI without uplink data (UL-SCH) is mapped to the PUSCH resource scheduled by DCI format 0_1. can be transmitted

13 is a diagram illustrating an example of an aperiodic CSI reporting method.

In an example 1300 of FIG. 13 , the UE may obtain DCI format 0_1 by monitoring the PDCCH 1301 , and may obtain scheduling information and CSI request information for the PUSCH 1305 therefrom. The UE may obtain resource information on the CSI-RS 1302 to be measured from the received CSI request indicator. The terminal receives the DCI format 0_1 and the CSI resource set setting (eg, NZP CSI-RS resource set setting (NZP-CSI-RS-ResourceSet)) based on the parameter for the offset (aperiodicTriggeringOffset) at some time point based on It is possible to determine whether measurement should be performed on the transmitted CSI-RS 1302. More specifically, the UE provides an offset value X of the parameter aperiodicTriggeringOffset in the NZP-CSI-RS resource set configuration by higher layer signaling from the base station. may be set, and the set offset value X may mean an offset between a slot in which DCI triggering aperiodic CSI reporting is received and a slot in which a CSI-RS resource is transmitted. For example, aperiodicTriggeringOffset parameter value and offset value X may have a mapping relationship described in [Table 39] below.

[Table 39]

An example 1300 of FIG. 13 shows an example in which the above-described offset value is set to X=0. In this case, the UE may receive the CSI-RS 1302 in the slot (corresponding to the slot 0 1306 of FIG. 13) in which the DCI format 0_1 triggering aperiodic CSI reporting is received, and the received CSI-RS The measured CSI information may be reported to the base station through the PUSCH 1305 . The UE may obtain scheduling information for the PUSCH 1305 for CSI reporting (information corresponding to each field of the DCI format 0_1 described above) from DCI format 0_1. For example, in DCI format 0_1, the UE may acquire information about a slot in which the PUSCH 1305 is transmitted from the time domain resource allocation information for the PUSCH 1305 described above. In an example 1300 of FIG. 13, the UE obtained a K2 value corresponding to the slot offset value for the PDCCH-to-PUSCH as 3, and accordingly, when the PUSCH 1305 receives the PDCCH 1301, slot 0 ( may be transmitted in slot 3 1309 3 slots away from 1306 .

In an example 1310 of FIG. 13 , the UE may obtain DCI format 0_1 by monitoring the PDCCH 1311 , and may obtain scheduling information and CSI request information for the PUSCH 1315 therefrom. The UE may obtain resource information on the CSI-RS 1312 to be measured from the received CSI request indicator. An example 1310 of FIG. 13 shows an example in which the above-described offset value for the CSI-RS is set to X=1. In this case, the UE may receive the CSI-RS 1312 in the slot (corresponding to the slot 0 1316 of FIG. 13 ) in which the DCI format 0_1 triggering aperiodic CSI reporting is received, and the received CSI-RS The measured CSI information may be reported to the base station through the PUSCH 1315 .

The aperiodic CSI report may include at least one or both of CSI part 1 and CSI part 2, and when the aperiodic CSI report is transmitted through the PUSCH, it may be multiplexed with a transport block. After the CRC is inserted into the input bit of the aperiodic CSI for multiplexing, encoding and rate matching are performed, and then it can be mapped to a resource element in the PUSCH in a specific pattern and transmitted. The CRC insertion may be omitted according to a coding method or the length of input bits. When multiplexing CSI Part 1 or CSI Part 2 included in the aperiodic CSI report, the number of modulation symbols calculated for rate matching may be calculated as shown in [Table 40] below.

[Table 40]

In particular, in the case of repeated PUSCH transmission schemes A and B, the UE may transmit the aperiodic CSI report by multiplexing only the first repeated transmission among the repeated PUSCH transmissions. This is because the multiplexed aperiodic CSI report information is encoded in a polar code method. At this time, in order to be multiplexed to several PUSCH repetitions, each PUSCH repetition must have the same frequency and time resource allocation, and in particular, in the case of PUSCH repetition type B, each actual repetition Since these OFDM symbol lengths may have different lengths, the aperiodic CSI report may be multiplexed and transmitted only for the first PUSCH repetition.

In addition, for PUSCH repeated transmission scheme B, when the UE schedules aperiodic CSI reporting without scheduling for a transport block or receives DCI that activates semi-permanent CSI reporting, the number of repeated PUSCH transmissions set as higher layer signaling is greater than 1. Even if it is large, the value of nominal repetition can be assumed to be 1. In addition, when the UE schedules or activates aperiodic or semi-permanent CSI reporting without scheduling for a transport block based on the PUSCH repetition transmission scheme B, the UE can expect that the first nominal repetition is equal to the first actual repetition. For PUSCH transmitted including semi-permanent CSI based on PUSCH repetition transmission method B without a schedule for DCI after semi-permanent CSI reporting is activated with DCI, if the first nominal repetition is different from the first actual repetition, the first nominal Transmission for repetition may be ignored.

[Related terminal capability reporting]

In LTE and NR, the terminal may perform a procedure of reporting the capability supported by the terminal to the corresponding base station while connected to the serving base station. In the description below, this is referred to as a UE capability report.

The base station may transmit a UE capability inquiry message for requesting a capability report to the terminal in the connected state. The message may include a terminal capability request for each radio access technology (RAT) type of the base station. The request for each RAT type may include supported frequency band combination information and the like. In addition, in the case of the terminal capability inquiry message, UE capability for a plurality of RAT types may be requested through one RRC message container transmitted by the base station, or the base station sends a terminal capability inquiry message including a terminal capability request for each RAT type. It can be delivered to the terminal by including it multiple times. That is, the terminal capability inquiry is repeated a plurality of times within one message, and the terminal may configure a corresponding UE capability information message and report it a plurality of times. In the next-generation mobile communication system, a terminal capability request for MR-DC (Multi-RAT dual connectivity) including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity) may be requested. In addition, the terminal capability inquiry message is generally transmitted initially after the terminal is connected to the base station, but it can be requested under any conditions when the base station needs it.

In the above step, the terminal receiving the UE capability report request from the base station configures the terminal capability according to the RAT type and band information requested from the base station. Below, a method for configuring UE capability in the NR system is summarized.

One. If the terminal receives a list of LTE and/or NR bands as a UE capability request from the base station, the terminal configures a band combination (BC) for EN-DC and NR stand alone (SA). That is, a candidate list of BC for EN-DC and NR SA is constructed based on the bands requested by the base station with FreqBandList. In addition, the priorities of the bands have priorities in the order described in the FreqBandList.

2. If the base station requests a UE capability report by setting the "eutra-nr-only" flag or the "eutra" flag, the terminal completely removes NR SA BCs from the candidate list of the configured BCs. This operation may only occur when an LTE base station (eNB) requests “eutra” capability.

3. Thereafter, the terminal removes the fallback BCs from the candidate list of BCs configured in the above step. Here, fallback BC means BC obtained by removing the band corresponding to at least one SCell from any BC, and since BC before removing the band corresponding to at least one SCell can already cover the fallback BC It is possible to omit This step also applies to MR-DC, ie LTE bands are also applied. The BCs remaining after this step are the final "candidate BC list".

4. The terminal selects BCs that match the requested RAT type from the final "candidate BC list" and selects BCs to be reported. In this step, the UE configures the supportedBandCombinationList in the predetermined order. That is, the UE configures the BC and UE capability to be reported according to the preset rat-Type order. (nr -> eutra-nr -> eutra). Also, configure featureSetCombination for the configured supportedBandCombinationList, and configure a list of "candidate feature set combination" from the candidate BC list from which the list for fallback BC (including the capability of the same or lower level) is removed. The above "candidate feature set combination" includes both feature set combinations for NR and EUTRA-NR BC, and can be obtained from the feature set combination of UE-NR-Capabilities and UE-MRDC-Capabilities containers.

5. Also, if the requested rat Type is eutra-nr and it affects, featureSetCombinations is included in both containers of UE-MRDC-Capabilities and UE-NR-Capabilities. However, the feature set of NR includes only UE-NR-Capabilities.

After the terminal capability is configured, the terminal transmits the terminal capability information message including the terminal capability to the base station. The base station then performs scheduling and transmission/reception management appropriate for the terminal based on the terminal capability received from the terminal.

[CA/DC Related]

17 is a diagram illustrating a radio protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation according to an embodiment of the present disclosure.

Referring to FIG. 17, the radio protocols of the next-generation mobile communication system are NR SDAP (Service Data Adaptation Protocol S25, S70), NR PDCP (Packet Data Convergence Protocol S30, S65), NR RLC (Radio Link Control) in the terminal and the NR base station, respectively. S35, S60) and NR MAC (Medium Access Control S40, S55).

The main function of the NR SDAP (S25, S70) may include some of the following functions.

- transfer of user plane data

- Mapping between a QoS flow and a DRB for both DL and UL for uplink and downlink

- Marking QoS flow ID in both DL and UL packets for uplink and downlink

- A function of mapping a reflective QoS flow to a data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

For the SDAP layer device, the UE can receive the RRC message to determine whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device for each PDCP layer device, for each bearer, or for each logical channel, and the SDAP header When is set, the UE sends uplink and downlink QoS flow and data bearer mapping information to the NAS QoS reflection setting 1-bit indicator (NAS reflective QoS) and the AS QoS reflection setting 1-bit indicator (AS reflective QoS) of the SDAP header. can be instructed to update or reset The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used as data processing priority and scheduling information to support a smooth service.

The main function of the NR PDCP (S30, S65) may include some of the following functions.

- Header compression and decompression (ROHC only)

- Transfer of user data

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- Reordering function (PDCP PDU reordering for reception)

- Duplicate detection of lower layer SDUs

- Retransmission of PDCP SDUs

- Ciphering and deciphering

- Timer-based SDU discard in uplink.

In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in an order based on a PDCP sequence number (SN), and a function of delivering data to a higher layer in the reordered order may include. Alternatively, the reordering function of the NR PDCP device may include a function of directly delivering without considering the order, and may include a function of reordering the order to record the lost PDCP PDUs, and the lost PDCP It may include a function of reporting the status of PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

The main function of the NR RLC (S35, S60) may include some of the following functions.

- Data transfer function (Transfer of upper layer PDUs)

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- ARQ function (Error Correction through ARQ)

- Concatenation, segmentation and reassembly of RLC SDUs

- Re-segmentation of RLC data PDUs

- Reordering of RLC data PDUs

- Duplicate detection

- Protocol error detection

- RLC SDU discard function (RLC SDU discard)

- RLC re-establishment function

In the above description, the in-sequence delivery function of the NR RLC device refers to a function of sequentially delivering RLC SDUs received from a lower layer to a higher layer. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering when one RLC SDU is originally divided into several RLC SDUs and received. It may include a function of rearranging based on an RLC sequence number (SN) or a PDCP sequence number (SN), and may include a function of reordering the order to record lost RLC PDUs. It may include a function of reporting a status to the transmitting side, and may include a function of requesting retransmission for lost RLC PDUs. In-sequence delivery of the NR RLC device may include a function of sequentially delivering only RLC SDUs before the lost RLC SDU to a higher layer when there is a lost RLC SDU, or Even if there is an RLC SDU, if a predetermined timer has expired, a function of sequentially transferring all RLC SDUs received before the timer starts to a higher layer may be included. Alternatively, the in-sequence delivery function of the NR RLC device may include a function of sequentially delivering all received RLC SDUs to a higher layer if a predetermined timer expires even if there are lost RLC SDUs. In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the sequence number and sequence number) and delivered to the PDCP device out of sequence (out-of sequence delivery). Segments stored in the buffer or to be received later are received, reconstructed into one complete RLC PDU, processed, and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed by the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

In the above, the out-of-sequence delivery function of the NR RLC device refers to a function of directly delivering RLC SDUs received from a lower layer to a higher layer regardless of order, and one RLC SDU originally has several RLCs. When received after being divided into SDUs, it may include a function of reassembling and delivering it, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs, arranging the order, and recording the lost RLC PDUs. can

The NR MAC (S40, S55) may be connected to several NR RLC layer devices configured in one terminal, and the main function of the NR MAC may include some of the following functions.

- Mapping between logical channels and transport channels

- Multiplexing/demultiplexing of MAC SDUs

- Scheduling information reporting function

- HARQ function (Error correction through HARQ)

- Priority handling between logical channels of one UE

- Priority handling between UEs by means of dynamic scheduling

- MBMS service identification

- Transport format selection

- Padding function (Padding)

The NR PHY layer (S45, S50) channel-codes and modulates the upper layer data, makes an OFDM symbol and transmits it to the radio channel, or demodulates the OFDM symbol received through the radio channel, decodes the channel, and transmits the operation to the upper layer. can be done

The detailed structure of the radio protocol structure may be variously changed according to a carrier (or cell) operating method. For example, when the base station transmits data to the terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure having a single structure for each layer, such as S00. On the other hand, when the base station transmits data to the terminal based on CA (carrier aggregation) using multiple carriers in a single TRP, the base station and the terminal have a single structure up to RLC like S10, but a protocol for multiplexing the PHY layer through the MAC layer structure will be used. As another example, when the base station transmits data to the terminal based on DC (dual connectivity) using multiple carriers in multiple TRP, the base station and the terminal have a single structure up to RLC as in S20, but the PHY layer through the MAC layer. A protocol structure for multiplexing is used.

Referring to the descriptions related to the PDCCH and beam configuration described above, it is difficult to achieve the required reliability in scenarios requiring high reliability, such as URLLC, because repeated PDCCH transmission is not currently supported in Rel-15 and Rel-16 NRs. The present invention improves the PDCCH reception reliability of the UE by providing a PDCCH repeated transmission method through multiple transmission points (TRP). Specific methods are described in detail in the following examples.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The contents of the present disclosure are applicable to FDD and TDD systems. Hereinafter, in the present disclosure, higher signaling (or higher layer signaling) is a signal transmission method in which the base station uses a downlink data channel of the physical layer to the terminal, or from the terminal to the base station using the uplink data channel of the physical layer, RRC signaling, or PDCP signaling, or MAC (medium access control) may also be referred to as a control element (MAC control element; MAC CE).

Hereinafter, in the present disclosure, when the UE determines whether cooperative communication is applied, the PDCCH(s) for allocating the PDSCH to which the cooperative communication is applied has a specific format, or the PDCCH(s) for allocating the PDSCH to which the cooperative communication is applied. PDCCH(s) including a specific indicator indicating whether communication is applied or not, or PDCCH(s) for allocating a PDSCH to which cooperative communication is applied is scrambled with a specific RNTI, or assuming cooperative communication application in a specific section indicated by a higher layer, etc. It is possible to use various methods. Hereinafter, for convenience of description, a case in which a UE receives a PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as an NC-JT case.

Hereinafter, in the present disclosure, determining the priority between A and B means selecting one having a higher priority according to a predetermined priority rule and performing an operation corresponding thereto or having a lower priority. It can be mentioned in various ways, such as omit or drop.

Hereinafter, in the present disclosure, the examples are described through a plurality of embodiments, but these are not independent and it is possible to apply one or more embodiments simultaneously or in combination.

[NC-JT Related]

According to an embodiment of the present disclosure, non-coherent joint transmission (NC-JT) may be used for the UE to receive the PDSCH from a plurality of TRPs.

Unlike the conventional 5G wireless communication system, it can support both a service requiring a high transmission rate, a service having a very short transmission delay, and a service requiring a high connection density. In a wireless communication network including a plurality of cells, transmission and reception points (TRPs), or beams, coordinated transmission between each cell, TRP and/or beam increases the strength of a signal received by the terminal or each cell , TRP and/or inter-beam interference control can be efficiently performed to satisfy various service requirements.

Joint Transmission (JT) is a representative transmission technology for the above-mentioned cooperative communication. By transmitting a signal to one terminal through a plurality of different cells, TRPs or/and beams, the strength or throughput of a signal received by the terminal is a technique to increase At this time, the characteristics of the channel between each cell, TRP or / and beam and the terminal may be significantly different, and in particular, non-coherent precoding between each cell, TRP or / and beam is supported. In the case of non-coherent joint transmission (NC-JT, Non-Coherent Joint Transmission), individual precoding, MCS, resource allocation, TCI indication, etc. are required depending on the channel characteristics of each cell, TRP or/and beam and each link between the beam and the terminal. can

The above-described NC-JT transmission is a downlink data channel (PDSCH: physical downlink shared channel), a downlink control channel (PDCCH: physical downlink control channel), an uplink data channel (PUSCH: physical uplink shared channel), an uplink control channel (PUCCH: physical uplink control channel) may be applied to at least one channel. During PDSCH transmission, transmission information such as precoding, MCS, resource allocation, and TCI is indicated by DL DCI, and for NC-JT transmission, the transmission information must be independently indicated for each cell, TRP, and/or beam. This becomes a major factor in increasing a payload required for DL DCI transmission, which may adversely affect reception performance of a PDCCH transmitting DCI. Therefore, it is necessary to carefully design a tradeoff between the amount of DCI information and the control information reception performance to support the JT of the PDSCH.

18 is a diagram illustrating an example of an antenna port configuration and resource allocation for transmitting a PDSCH using cooperative communication in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 18 , an example for PDSCH transmission is described for each technique of Joint Transmission (JT), and examples for allocating radio resources for each TRP are shown.

Referring to FIG. 18 , an example (N000) for coherent joint transmission (C-JT) supporting coherent precoding between each cell, TRP or/and beam is shown.

In the case of C-JT, TRP A (N005) and TRP B (N010) transmit a single data (PDSCH) to the terminal (N015), and can perform joint precoding in a plurality of TRPs. This may mean that the DMRS is transmitted through the same DMRS ports so that TRP A (N005) and TRP B (N010) transmit the same PDSCH. For example, each of TRP A (N005) and TRP B (N010) may transmit a DRMS to the UE through DMRS port A and DMRS B. In this case, the UE may receive one piece of DCI information for receiving one PDSCH demodulated based on DMRS transmitted through DMRS port A and DMRS B.

18 is an example of non-coherent joint transmission (NC-JT) supporting non-coherent precoding between each cell, TRP or / and beam for PDSCH transmission ( N020).

In the case of NC-JT, a PDSCH is transmitted to the UE N035 for each cell, TRP, and/or beam, and individual precoding may be applied to each PDSCH. Each cell, TRP and/or beam transmits a different PDSCH or different PDSCH layers to the UE, thereby improving throughput compared to single cell, TRP and/or beam transmission. In addition, each cell, TRP or / and beam repeatedly transmits the same PDSCH to the UE, thereby improving reliability compared to single cell, TRP and / and beam transmission. For convenience of description, a cell, a TRP, and/or a beam is collectively referred to as a TRP hereinafter.

At this time, when the frequency and time resources used by a plurality of TRPs for PDSCH transmission are all the same (N040), when the frequency and time resources used by the plurality of TRPs do not overlap at all (N045), in the plurality of TRPs Various radio resource allocation may be considered, such as when some of the frequency and time resources used overlap (N050).

In order to simultaneously allocate a plurality of PDSCHs to one UE for NC-JT support, DCIs of various types, structures, and relationships may be considered.

19 is a configuration of downlink control information (DCI) for NC-JT in which each TRP transmits a different PDSCH or different PDSCH layers to a UE in a wireless communication system according to an embodiment of the present disclosure. It is a diagram showing an example for

Referring to FIG. 19, case #1 (N100) is from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used for single PDSCH transmission. In a situation where other (N-1) PDSCHs are transmitted, it is an example in which control information for PDSCHs transmitted in (N-1) additional TRPs is transmitted independently of control information for PDSCHs transmitted in a serving TRP. . That is, the UE receives control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through independent DCIs (DCI#0 to DCI#(N-1)). can be obtained The formats between the independent DCIs may be the same or different from each other, and the payloads between the DCIs may also be the same or different from each other. In the aforementioned case #1, each PDSCH control or allocation freedom can be completely guaranteed, but when each DCI is transmitted in different TRPs, a coverage difference for each DCI may occur and reception performance may deteriorate.

Case #2 (N105) is different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used for single PDSCH transmission. ) PDSCHs are transmitted, control information (DCI) for the PDSCH of (N-1) additional TRPs is transmitted, respectively, and each of these DCIs is dependent on the control information for the PDSCH transmitted from the serving TRP. see.

For example, in the case of DCI#0, which is control information for PDSCH transmitted from the serving TRP (TRP#0), all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 are included, but cooperative TRP DCI format 1_0 in the case of shortened DCI (hereinafter, sDCI) (sDCI#0 to sDCI#(N-2)), which is control information for PDSCHs transmitted from (TRP#1 to TRP#(N-1)), Only some of the information elements of DCI format 1_1 and DCI format 1_2 may be included. Therefore, in the case of sDCI transmitting control information for PDSCHs transmitted from cooperative TRPs, compared to normal DCI (nDCI) transmitting PDSCH-related control information transmitted from the serving TRP, the payload is smaller than nDCI. Therefore, it is possible to include reserved bits.

In case #2 described above, each PDSCH control or allocation freedom may be limited according to the content of the information element included in the sDCI. probability may be lowered.

Case #3 (N110) is different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used for single PDSCH transmission. ) PDSCHs are transmitted, one control information for the PDSCH of (N-1) additional TRPs is transmitted, and this DCI shows an example dependent on the control information for the PDSCH transmitted from the serving TRP.

For example, in the case of DCI#0, which is control information for the PDSCH transmitted from the serving TRP (TRP#0), all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 are included, and the cooperative TRP In the case of control information on PDSCHs transmitted from (TRP#1 to TRP#(N-1)), only some of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 are one 'secondary' DCI ( It is possible to collect and transmit to sDCI). For example, the sDCI may include at least one of HARQ-related information such as frequency domain resource assignment of cooperative TRPs, time domain resource assignment, and MCS. In addition, in the case of information not included in sDCI, such as bandwidth part (BWP) indicator or carrier indicator, DCI (DCI#0, normal DCI, nDCI) of the serving TRP may be followed.

In case #3 (N110), each PDSCH control or allocation freedom may be limited according to the content of the information element included in sDCI, but sDCI reception performance can be adjusted and case #1 (N100) or case #2 Compared to (N105), the complexity of DCI blind decoding of the terminal may be reduced.

Case #4 (N115) is different (N-1) from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used for single PDSCH transmission. ) PDSCHs are transmitted, control information for PDSCH transmitted from (N-1) additional TRPs is transmitted in the same DCI (Long DCI) as control information for PDSCH transmitted from serving TRP. That is, the UE may obtain control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI. In case #4 (N115), the complexity of DCI blind decoding of the terminal may not increase, but the PDSCH control or freedom of allocation may be low, such as the number of cooperative TRPs is limited according to long DCI payload restrictions.

In the following description and embodiments, sDCI may refer to various auxiliary DCIs, such as shortened DCI, secondary DCI, or normal DCI (DCI formats 1_0 to 1_1 described above) including PDSCH control information transmitted in cooperative TRP. If not specified, the description is similarly applicable to the various auxiliary DCIs.

In the following description and embodiments, the above-described cases #1 (N100), case #2 (N105), and case #3 (N110) in which one or more DCI (PDCCH) are used for NC-JT support are described as multiple PDCCHs. The above-described case #4 (N115) in which a single DCI (PDCCH) is used for supporting NC-JT may be classified as a single PDCCH-based NC-JT. In multiple PDCCH-based PDSCH transmission, the CORESET in which the DCI of the serving TRP (TRP#0) is scheduled and the CORESET in which the DCI of the cooperative TRPs (TRP#1 to TRP#(N-1)) are scheduled can be distinguished. As a method for distinguishing CORESETs, there may be a method for distinguishing through an upper layer indicator for each CORESET, a method for distinguishing through a beam setting for each CORESET, and the like. In addition, in single PDCCH-based NC-JT, a single DCI schedules a single PDSCH having a plurality of layers instead of scheduling a plurality of PDSCHs, and the plurality of layers described above may be transmitted from a plurality of TRPs. At this time, the connection relationship between the layer and the TRP for transmitting the layer may be indicated through a Transmission Configuration Indicator (TCI) indication for the layer.

In the embodiments of the present disclosure, “cooperative TRP” may be replaced with various terms such as “cooperative panel” or “cooperative beam” when applied in practice.

In the embodiments of the present disclosure, "when NC-JT is applied" means "when a terminal simultaneously receives one or more PDSCHs in one BWP", "when a terminal receives two or more TCIs (Transmissions) simultaneously in one BWP" Configuration Indicator) indication when receiving a PDSCH", "If the PDSCH received by the terminal is associated with one or more DMRS port groups (association)", it is possible to interpret variously according to the situation. For convenience, it is used as one expression.

In the present invention, the radio protocol structure for NC-JT can be used in various ways according to the TRP deployment scenario. As an example, when there is no or small backhaul delay between cooperative TRPs, a method (CA-like method) using a structure based on MAC layer multiplexing similar to S10 of FIG. 17 is possible. On the other hand, when the backhaul delay between cooperative TRPs is so large that it cannot be ignored (for example, when information exchange of CSI, scheduling, HARQ-ACK, etc. between cooperative TRPs requires more than 2 ms), similar to S20 of FIG. A method (DC-like method) to secure a characteristic strong against delay is possible by using an independent structure for each TRP from the RLC layer.

A terminal supporting C-JT / NC-JT may receive a C-JT / NC-JT related parameter or setting value from a higher layer configuration, and may set an RRC parameter of the terminal based on this. For higher layer configuration, the UE may use a UE capability parameter, for example, tci-StatePDSCH. Here, the UE capability parameter, for example, tci-StatePDSCH may define TCI states for the purpose of PDSCH transmission, and the number of TCI states is 4, 8, 16, 32, 64, 128 in FR1, 64, 128 in FR2 may be set, and up to eight states that can be indicated by 3 bits of the TCI field of DCI through the MAC CE message among the set number may be set. The maximum value of 128 means a value indicated by maxNumberConfiguredTCIstatesPerCC in the tci-StatePDSCH parameter included in capability signaling of the UE. In this way, a series of configuration processes from upper layer configuration to MAC CE configuration may be applied to a beamforming instruction or a beamforming change command for at least one PDSCH in one TRP.

[Multi-DCI based Multi-TRP]

According to an embodiment of the present disclosure, a downlink control channel for NC-JT transmission may be configured based on the Multi-PDCCH.

In NC-JT based on multiple PDCCH, when transmitting DCI for PDSCH schedule of each TRP, it may have a CORESET or a search space divided for each TRP. The CORESET or search space for each TRP can be set as at least one of the following cases.

* Upper layer index setting for each CORESET: CORESET setting information set as a higher layer may include an index value, and the TRP for transmitting the PDCCH from the corresponding CORESET may be distinguished by the set index value for each CORESET. That is, in a set of CORESETs having the same higher layer index value, it may be considered that the same TRP transmits a PDCCH or that a PDCCH scheduling a PDSCH of the same TRP is transmitted. The above-described index for each CORESET may be named as CORESETPoolIndex, and it may be considered that the PDCCH is transmitted from the same TRP for CORESETs in which the same CORESETPoolIndex value is set. In the case of CORESET in which the CORESETPoolIndex value is not set, it may be considered that the default value of CORESETPoolIndex is set, and the above-described default value may be 0.

* Multiple PDCCH-Config settings: Multiple PDCCH-Configs in one BWP are set, and each PDCCH-Config may include PDCCH settings for each TRP. That is, a list of CORESETs per TRP and/or a list of search spaces per TRP may be configured in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config are considered to correspond to a specific TRP. can do.

* CORESET beam/beam group configuration: TRP corresponding to the corresponding CORESET can be distinguished through a beam or beam group set for each CORESET. For example, when the same TCI state is configured in a plurality of CORESETs, it may be considered that the CORESETs are transmitted through the same TRP or that the PDCCH scheduling the PDSCH of the same TRP is transmitted in the corresponding CORESETs.

* Search space beam/beam group configuration: A beam or beam group is configured for each search space, and TRP for each search space can be distinguished through this. For example, if the same beam/beam group or TCI state is configured in multiple search spaces, it may be considered that the same TRP transmits a PDCCH or that a PDCCH scheduling a PDSCH of the same TRP is transmitted in the corresponding search space. have.

By dividing CORESET or search space by TRP as described above, PDSCH and HARQ-ACK information classification for each TRP is possible, and through this, independent HARQ-ACK codebook generation for each TRP and independent PUCCH resource use are possible.

The above setting may be independent for each cell or for each BWP. For example, while two different CORESETPoolIndex values are set in the PCell, the CORESETPoolIndex value may not be set in a specific SCell. In this case, it may be considered that NC-JT transmission is configured in the PCell, whereas NC-JT transmission is not configured in the SCell in which the CORESETPoolIndex value is not set.

[Single-DCI based Multi-TRP]

According to another embodiment of the present disclosure, a downlink beam for NC-JT transmission may be configured based on Single-PDCCH.

In Single PDCCH-based NC-JT, PDSCH transmitted by multiple TRPs can be scheduled with one DCI. In this case, the number of TCI states may be used as a method of indicating the number of TRPs transmitting the corresponding PDSCH. That is, if the number of TCI states indicated in the DCI for scheduling the PDSCH is two, it can be regarded as single PDCCH-based NC-JT transmission, and when the number of TCI states is one, it can be regarded as single-TRP transmission. The TCI states indicated in the DCI may correspond to one or two TCI states among TCI states activated by MAC-CE. When the TCI states of DCI correspond to the two TCI states activated by MAC-CE, a correspondence relationship between the TCI codepoint indicated in DCI and the TCI states activated by MAC-CE is established, and the MAC corresponding to the TCI codepoint It may be when there are two TCI states activated with -CE.

The above setting may be independent for each cell or for each BWP. For example, a PCell may have a maximum of two activated TCI states corresponding to one TCI codepoint, whereas a specific SCell may have a maximum of one activated TCI states corresponding to one TCI codepoint. In this case, it can be considered that NC-JT transmission is configured in the PCell, whereas NC-JT transmission is not configured in the aforementioned SCell.

According to the description of the above-described PUSCH and aperiodic/semi-permanent CSI reporting, in the current Rel-15/16 NR, the aperiodic CSI report can be multiplexed only to the first PUSCH or the first actual repetition according to the PUSCH repeated transmission scheme A or B. have. That is, the aperiodic CSI report can be transmitted using only a single TRP using a single transmission beam. On the other hand, in Rel-17 FeMIMO, in order to obtain better reliability during repeated PUSCH transmission, a plurality of TRP-based PUSCH repetitions that can secure spatial diversity by applying a plurality of transmission beams to PUSCH repetition are extended and supported. This is being discussed. In this discussion, based on the existing PUSCH repetition transmission scheme A or B, different beams are applied to each PUSCH repetition to support repeated PUSCH transmission to a plurality of TRPs. At this time, in the case of a plurality of TRP-based PUSCH repeated transmission schemes A or B, if the aperiodic CSI report is multiplexed and transmitted, if multiplexed only for the first PUSCH repetition as in the existing Rel-15/16 scheme, the transmission to the TRP is blockage, etc. Since it may fail due to the channel degradation factor of At this time, as described above, due to the characteristics of the polar code, when each PUSCH is repeatedly transmitted, the time and frequency resource allocation values, that is, the number of resource elements (REs) allocated to the UE must be the same, so that the base station can perform combining after reception. have. Therefore, when the aperiodic CSI report is multiplexed while the transport block is transmitted using the PUSCH repetition transmission scheme A or B, a method of determining which PUSCH repetition among the entire PUSCH repetitions to multiplex the aperiodic CSI report may be required. In addition, when aperiodic or semi-permanent CSI reporting is multiplexed when a transport block is not transmitted in the PUSCH repeated transmission scheme B, even if the number of PUSCH repetitions is set to be greater than 1, transmission at least once for each TRP should be guaranteed to be possible. can In the present invention, when multiplexing or transmitting an aperiodic/semi-permanent CSI report as described above, a method for multiplexing or transmitting a CSI report for repeated PUSCH transmission considering a plurality of TRPs is provided to improve CSI reception reliability at the base station. can do it Specific methods are described in detail in the following examples.

For convenience in the following description of the present disclosure, a cell, transmission point, panel, beam or / and a transmission direction and the like are unified and described as a transmission reception point (TRP). Therefore, in actual application, it is possible to appropriately replace TRP with one of the above terms.

Hereinafter, in the present disclosure, when the UE determines whether cooperative communication is applied, the PDCCH(s) for allocating the PDSCH to which the cooperative communication is applied has a specific format, or the PDCCH(s) for allocating the PDSCH to which the cooperative communication is applied. PDCCH(s) including a specific indicator indicating whether communication is applied or not, or PDCCH(s) for allocating a PDSCH to which cooperative communication is applied is scrambled with a specific RNTI, or assuming cooperative communication application in a specific section indicated by a higher layer, etc. It is possible to use various methods. Hereinafter, for convenience of description, a case in which a UE receives a PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as an NC-JT case.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of gNode B, gNB, eNode B, Node B, BS (Base Station), radio access unit, base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Hereinafter, an embodiment of the present disclosure will be described using a 5G system as an example, but the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, LTE or LTE-A mobile communication and mobile communication technology developed after 5G may be included therein. Accordingly, the embodiments of the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by those of ordinary skill in the art. The contents of the present disclosure are applicable to FDD and TDD systems.

In addition, in the description of the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, in describing the present disclosure, higher layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

- MIB (Master Information Block)

- SIB (System Information Block) or SIB X (X=1, 2, ...)

- RRC (Radio Resource Control)

- MAC (Medium Access Control) CE (Control Element)

In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more of the following physical layer channels or signaling methods using signaling.

- PDCCH (Physical Downlink Control Channel)

- DCI (Downlink Control Information)

- UE-specific DCI

- Group common DCI

- Common DCI

- Scheduling DCI (for example, DCI used for scheduling downlink or uplink data)

- Non-scheduling DCI (for example, DCI not for the purpose of scheduling downlink or uplink data)

- PUCCH (Physical Uplink Control Channel)

- UCI (Uplink Control Information)

Hereinafter, in the present disclosure, determining the priority between A and B means selecting one having a higher priority according to a predetermined priority rule and performing an operation corresponding thereto or having a lower priority. It can be mentioned in various ways, such as omit or drop.

Hereinafter, in the present disclosure, the examples are described through a plurality of embodiments, but these are not independent and it is possible to apply one or more embodiments simultaneously or in combination.

<First embodiment: PUSCH repeated transmission method considering multiple TRP>

The first embodiment of the present disclosure describes a higher layer signaling configuration and L1 signaling indication method for repeated PUSCH transmission in consideration of multiple TRP. Repeated PUSCH transmission in consideration of multiple TRPs may be operated through single or multiple DCI-based indications, which will be described in Examples 1-1 and 1-2, respectively. In addition, in the 1-3 embodiment of the present disclosure, a method of repeatedly transmitting a configured grant PUSCH in consideration of multiple TRP will be described. In addition, in embodiments 1-4 of the present disclosure, a method for configuring an SRS resource set for repeated PUSCH transmission in consideration of multiple TRP will be described.

<Embodiment 1-1: PUSCH repeated transmission method considering multiple TRP based on single DCI>

As an embodiment of the present disclosure, in embodiment 1-1, a PUSCH repeated transmission method in consideration of multiple TRPs based on a single DCI will be described. The UE may report to the base station that a PUSCH repeated transmission method in consideration of multiple TRPs based on a single DCI is possible through the UE capability report. The base station can set which PUSCH repeated transmission scheme to use for the terminal that reported the corresponding terminal capability (eg, the terminal capability to support repeated PUSCH transmission considering single DCI-based multiple TRP) through higher layer signaling. have. In this case, the higher layer signaling may be configured by selecting one of the two types of repeated PUSCH transmission type A and repeated PUSCH transmission type B.

In Rel-15/16, in the case of the PUSCH repeated transmission method considering a single TRP, both the codebook and non-codebook-based transmission methods were performed based on a single DCI. The UE may apply the same value to each repeated PUSCH transmission by using the SRI or TPMI indicated by one DCI when transmitting the codebook-based PUSCH. In addition, the UE may apply the same value to each repeated PUSCH transmission using an SRI indicated by one DCI when transmitting a non-codebook-based PUSCH. For example, if codebook-based PUSCH transmission and PUSCH repeated transmission scheme A are configured as higher layer signaling, and the time resource allocation index, SRI index 0, and TPMI index 0 in which the number of repeated PUSCH transmissions is set to 4, are instructed through DCI, The UE applies both SRI index 0 and TPMI index 0 to each of the 4 repeated PUSCH transmissions. Here, SRI may be related to a transmit beam, and TPMI may be related to a transmit precoder. Unlike the repeated PUSCH transmission method considering a single TRP, the repeated PUSCH transmission method considering multiple TRPs may have to apply a transmission beam and a transmission precoder differently for transmission to each TRP. Accordingly, the UE may receive a plurality of SRIs or TPMIs indicated through DCI and apply them to each repeated PUSCH transmission to perform repeated PUSCH transmission in consideration of multiple TRPs.

When instructing the UE to transmit a PUSCH repeated transmission method considering multiple TRPs based on a single DCI, the following methods are considered as a method of instructing the UE to indicate a plurality of SRIs or TPMIs when the PUSCH transmission method is a codebook or non-codebook. can be

[Method 1] Single DCI transmission with multiple SRI or TPMI fields

In order to support the PUSCH repeated transmission method considering multiple TRPs based on a single DCI, the base station may transmit a DCI having a plurality of SRI or TPMI fields to the UE. This DCI is a new format (eg, DCI format 0_3) or an existing format (eg, DCI format 0_1, 0_2), but it is determined whether additional higher layer signaling (eg, a plurality of SRI or TPMI fields can be supported) capable signaling) is configured and the corresponding configuration exists, it may be DCI in which there are a plurality of SRI or TPMI fields, each existing only one by one. For example, if the UE is configured with codebook-based PUSCH transmission as higher layer signaling, if higher layer signaling capable of determining whether a plurality of SRI or TPMI fields can be supported is configured, two SRI fields and two By receiving DCI of a new format or an existing format having a TPMI field, it is possible to perform repeated PUSCH transmission based on a codebook in consideration of multiple TRPs. As another example, when non-codebook-based PUSCH transmission is configured as higher layer signaling, if higher layer signaling capable of determining whether a plurality of SRI or TPMI fields can be supported is configured, two SRI fields By receiving DCI of a new format or an existing format with For all of the above-described codebook or non-codebook-based PUSCH transmission, if a plurality of SRI fields are used, two or more SRS resource sets in which usage, which is higher layer signaling, is set to a codebook or a non-codebook, may be configured, Each SRI field may indicate an SRS resource, respectively, and each SRS resource may be included in two different SRS resource sets. The contents of the plurality of SRS resource sets will be described in detail in the 1-4th embodiment.

[Method 2] DCI transmission with enhanced SRI and TPMI fields applied

In order to support a PUSCH repeated transmission method considering multiple TRPs based on a single DCI, the UE may receive an enhanced SRI or MAC-CE for TPMI field support from the base station. The corresponding MAC-CE provides information to change the interpretation of the codepoint of the DCI field to indicate a plurality of transmission beams for a specific codepoint of the SRI field in the DCI or to indicate a plurality of transmission precoders for a specific codepoint of the TPMI field. may include The following two methods may be considered as a method of indicating a plurality of transmission beams.

- MAC-CE reception that activates a specific codepoint of the SRI field to indicate one SRS resource connected to a plurality of SRS spatial relation info

- MAC-CE reception that activates a specific codepoint of the SRI field to indicate a plurality of SRS resources connected to one SRS spatial relation info

When indicating a plurality of SRS resources using the enhanced SRI field, since the transmission power control parameters of the SRS resource are set for each SRS resource set, in order to set different transmission power control parameters for each TRP, each SRS resource is different It may exist in the SRS resource set. Accordingly, there may be two or more SRS resource sets in which usage, which is higher layer signaling, is set to codebook or non-codebook.

<Embodiment 1-2: PUSCH repeated transmission method considering multiple TRP based on multiple DCI>

As an embodiment of the present disclosure, in embodiments 1-2, a PUSCH repeated transmission method in consideration of multiple TRP based on multiple DCI will be described. As described above, since all PUSCH repeated transmission methods in Rel-15/16 consider a single TRP, it is recommended that the transmission beam, transmission precoder, resource allocation, and power control parameters use the same value for each repeated transmission. It was possible. However, in the case of repeated PUSCH transmission considering multiple TRPs, PUSCH transmission related parameters set by higher layer signaling or indicated by DCI for each repeated PUSCH transmission to multiple TRPs may need to be applied differently for each TRP. For example, when multiple TRPs exist in different directions from the terminal, since the transmission beam or the transmission precoder may be different, the transmission beam or the transmission precoder for each TRP needs to be set or indicated, respectively. As another example, when multiple TRPs exist at different distances from the UE, independent power control schemes between the multiple TRPs and the UE may be required, and thus different time/frequency resource allocation may be made. For example, a relatively small number of RBs and a large number of symbols may be allocated to a TRP existing at a relatively long distance compared to a specific TRP in order to increase power per RE. Therefore, if different information applied to each TRP is to be transmitted to the UE through a single DCI, the bit length of the corresponding DCI may be very large, so it may be more efficient to instruct the UE to repeatedly transmit PUSCH through a plurality of DCIs. .

The UE may report to the base station that a PUSCH repeated transmission method considering multiple TRP based on multiple DCI is possible through the UE capability report. The base station, for the terminal reporting the corresponding terminal capability (eg, terminal capability supporting PUSCH repeated transmission considering multiple DCI-based multi TRP), configuration through higher layer signaling, indication through L1 signaling, or higher layer By using configuration and indication through a combination of signaling and L1 signaling, it is possible to notify the UE to perform repeated PUSCH transmission in consideration of multiple TRPs through multiple DCI. The base station may use a method of configuring or instructing repeated PUSCH transmission in consideration of multiple TRP based on multiple DCI as follows.

The UE can expect different time/frequency resource allocation information indicated through each DCI in consideration of TRPs that exist at different distances from the UE during repeated PUSCH transmission in consideration of multiple TRPs based on multiple DCIs. The UE may report whether different time/frequency resources can be allocated to the base station with the UE capability. The base station can set whether to allocate different time/frequency resources to the terminal through higher layer signaling, and the terminal receiving the configuration can expect different time/frequency resource allocation information to be instructed by each DCI. In this case, the UE may configure or receive repeated PUSCH transmission in consideration of multiple DCI-based multiple TRPs from the base station in consideration of the conditions between the higher layer signaling configuration and the plurality of DCI fields. When the transmit beam and transmit precoder information are instructed through multiple DCI, the SRI and TPMI in the first received DCI may be applied first when the transmit beam mapping method of the second embodiment is applied, and receive second SRI and TPMI in one DCI can be applied secondly when the transmission beam mapping method of the second embodiment is applied.

The base station can set CORESETPoolIndex, which is higher layer signaling to the terminal, for each CORESET, and when the terminal receives which CORESET, it can know from which TRP the corresponding CORESET is transmitted through CORESETPoolIndex. For example, if CORESETPoolIndex is set to 0 in CORESET#1 and CORESETPoolIndex is set to 1 in CORESET#2, the UE can know that CORESET#1 is transmitted from TRP#0 and CORESET#2 is transmitted from TRP#1. have. In addition, that DCI transmitted in each CORESET for which CORESETPoolIndex values are set to 0 and 1, respectively, indicates a repeated PUSCH may be implicitly indicated by a condition between specific fields in a plurality of transmitted DCIs. For example, when the HARQ process number field values in the plurality of DCIs transmitted by the base station to the terminal are the same and the NDI field values are also the same, the terminal schedules a PUSCH in which the corresponding plurality of DCIs are repeated in consideration of the multi-TRP, respectively. can be considered implicitly. On the other hand, when the HARQ process number field value is the same and the NDI field value is also the same, there may be restrictions on reception of a plurality of DCIs. For example, the maximum interval between the plurality of DCI receptions may be defined within the number of one or more specific slots or within the number of one or more specific symbols. In this case, the UE may perform PUSCH transmission based on the calculated (or checked) minimum transport block size based on time/frequency resource allocation information indicated differently in a plurality of DCIs.

<Embodiment 1-3: Repeated transmission method of Configured grant PUSCH considering multiple TRP>

As an embodiment of the present disclosure, in embodiments 1-3, a method for repeatedly transmitting a configured grant PUSCH in consideration of multiple TRPs will be described. The UE may report to the base station with the UE capability whether or not to repeatedly transmit a configured grant PUSCH in consideration of multiple TRPs. The base station uses the following various methods for repeated transmission of a configured grant PUSCH in consideration of multiple TRP to set the UE as upper layer signaling, or instruct L1 signaling, or use a combination of higher layer signaling or L1 signaling to set and instruct can

[Method 1] Activate single DCI-based single configured grant setting

Method 1 is a method of instructing the UE to a plurality of SRIs or TPMIs based on the single DCI, and activating a single configured grant setting along with the corresponding instruction. A method of indicating a plurality of SRIs or TPMIs with a single DCI may follow the method of the 1-1 embodiment, and if the configured grant setting for the terminal is If there is only one, all bits of the HARQ process number field and the redundancy version field in the corresponding DCI may be indicated as 0. If there are a plurality of configured grant settings in the terminal and one of them is activated as the corresponding DCI, the HARQ process number field in the corresponding DCI may indicate the index of the configured grant setting, and all bits of the redundancy version field are indicated by 0. can be The UE uses a plurality of SRIs or TPMIs indicated by a single DCI, and according to the transmission beam mapping method in the second embodiment below, a transmission beam and a transmission precoder may be mapped to each of the activated configured grant PUSCH repeated transmissions.

[Method 2] Enable multiple DCI-based single configured grant settings

Method 2 is a method of instructing the UE to a plurality of SRIs or TPMIs based on the multiple DCI, and activating a single configured grant setting along with the corresponding instruction. The method of indicating a plurality of SRIs or TPMIs based on the multiple DCI may follow the method of the first 1-2 embodiment, and if there is only one grant configuration configured for the terminal, all HARQ process number fields in the corresponding multiple DCI and all bits of the redundancy version field may be indicated as 0. If there are a plurality of configured grant settings in the terminal and one of them is activated as the corresponding multiple DCI, all HARQ process number fields in the multiple DCI may indicate the index of the same configured grant setting, and all redundancy in the multiple DCI All bits of the version field may be indicated as 0. According to the condition of the DCI field during repeated multi-DCI-based PUSCH transmission, the NDI field in addition to the HARQ process number field may also have the same value. The UE may use a plurality of SRIs or TPMIs indicated by multiple DCIs to map a transmission beam and a transmission precoder to each of the activated configured grant PUSCH repeated transmissions according to the following transmission beam mapping method. For example, the transmit beam and transmit precoder related information indicated by the first received DCI are SRI#1 and TPMI#1, and the transmit beam and transmit precoder related information indicated by the second received DCI is SRI #2 and TPMI#2, and if the transmission beam mapping method set for upper layer signaling is cyclical, the UE includes SRI#1 and PUSCH transmission may be performed by applying TPMI#1 and applying SRI#2 and TPMI#2 to even-numbered transmissions (2, 4, 6, ...) of repeated transmission.

[Method 3] Activation of multiple DCI-based multiple configured grant settings

Method 3 is a method of instructing the UE to a plurality of SRIs or TPMIs based on the multiple DCI, and activating multiple configured grant settings along with the corresponding indication. A method of indicating a plurality of SRIs or TPMIs based on multiple DCIs may follow the method of the first and second embodiments. When a plurality of configured grant settings exist in the terminal, the index of each configured grant setting may be indicated through the HARQ process number field in each DCI. In addition, all bits of all redundancy version fields in the corresponding multi-DCI may be indicated as 0. According to the condition of the DCI field during repeated multi-DCI-based PUSCH transmission, the NDI field in addition to the HARQ process number field may also have the same value. The terminal may receive MAC-CE signaling indicating (command) the connection between a plurality of configured grant settings activated by multiple DCI. The terminal can receive multiple DCIs from the base station 3 ms after performing HARQ-ACK transmission for MAC-CE signaling, and if the configured grant configuration index indicated by each DCI indicates the connection through the MAC-CE signaling ( If the command) matches the received configured grant configuration indexes, it is possible to perform repeated PUSCH transmission in consideration of multiple TRP based on the indicated configured grant settings. At this time, some settings may be shared with the same value among a plurality of connected grant settings. For example, repK, which is higher layer signaling, which means the number of repeated transmissions, repK-RV, which is higher layer signaling, which means the order of redundancy version during repeated transmission, and periodicity, which is higher layer signaling, which means the period of repeated transmission, is connected to a configured grant It can be set to have the same value within the setting.

<Embodiment 1-4: SRS resource set setting method for repeated PUSCH transmission in consideration of multiple TRP>

As an embodiment of the present disclosure, in embodiments 1-4, a method of configuring an SRS resource set for repeated PUSCH transmission in consideration of multiple TRP will be described. Since the power control parameters of the SRS (eg, alpha, p0, pathlossReferenceRS, srs-PowerControlAjdustmentStates, etc., which can be set by higher layer signaling) may vary for each SRS resource set, SRS for each TRP during repeated PUSCH transmission considering multiple TRPs For the purpose of different power control of the SRS resource set, the number of SRS resource sets is increased to two or more, and different SRS resource sets can be used for the purpose of supporting different TRPs. The SRS resource set setting method considered in this embodiment can be applied to the 1-1 to 1-3 embodiments.

In case of repeated PUSCH transmission considering multiple TRP based on a single DCI, a plurality of SRIs indicated by a single DCI may be selected from among SRS resources existing in different SRS resource sets. For example, if two SRIs are indicated by a single DCI, the first SRI may be selected from SRS resource set #1, and the second SRI may be selected from SRS resource set #2.

In case of repeated PUSCH transmission considering multiple DCI-based multiple TRPs, each SRI indicated by two DCIs can be selected from among SRS resources existing in different SRS resource sets, and each SRS resource set means each TRP It can be explicitly or implicitly connected (corresponding) to higher layer signaling (eg CORESETPoolIndex). As an explicit connection method, the CORESETPoolIndex value may be set in the setting of the SRS resource set set to the upper layer to notify the UE of the semi-static connection state between the CORESET and the SRS resource set. As another example, as a more dynamic explicit connection method, MAC-CE that activates the connection between a specific CORESET (including all cases where the value of CORESETPoolIndex is set to 0 or 1 or not set) and the SRS resource set You can also use it. After receiving the MAC-CE that activates the connection between the specific CORESET (including all cases where the value of CORESETPoolIndex is set to 0 or 1 or not set) and the SRS resource set, the UE transmits the HARQ-ACK 3 ms From then on, it can be considered that the connection between the CORESET and the SRS resource set is activated. The implicit method is to assume an implicit connection state using a specific criterion between the CORESETPoolIndex and the index of the SRS resource set. For example, if it is assumed that the terminal has received two sets of SRS resource set #0 and #1, the terminal assumes that CORESETPoolIndex is not set or is connected to SRS resource set #0 with CORESETs set to 0, and CORESETPoolIndex is set to 1 It can be assumed that SRS resource set#1 is connected to the set CORESET.

For the above single or multiple DCI-based methods, a terminal that has been explicitly or implicitly configured or instructed to connect with each TRP with a different SRS resource set srs-PowerControlAdjustmentStates set as higher layer signaling in each SRS resource set You can expect it to be set to sameAsFci2 for the value, not to be set to separateClosedLoop. In addition, it can be expected that the usage set for upper layer signaling in each SRS resource set is set equally to codebook or noncodebook.

<Embodiment 1-5: dynamic switching method for determining PUSCH transmission considering single TRP or PUSCH transmission considering multiple TRPs based on codebook>

As an embodiment of the present disclosure, embodiments 1-5 describe a dynamic switching method for determining PUSCH transmission considering single TRP based on codebook or PUSCH transmission considering multiple TRPs.

According to the 1-1 and 1-4, the base station receives a terminal capability report from a terminal capable of performing codebook-based repeated PUSCH transmission in consideration of single DCI-based multiple TRP, and repeatedly transmits PUSCH through multiple TRPs. Higher layer signaling for performing may be configured in the terminal. At this time, when repeatedly transmitting PUSCH considering multiple TRPs based on single DCI as in the 1-4 embodiments, the base station transmits a single DCI including a plurality of SRI fields to indicate SRS resources existing in different SRS resource sets. It can be transmitted to the terminal. In this case, each of the plurality of SRI fields may be interpreted in the same manner as in NR Release 15/16. More specifically, the first SRI field may select an SRS resource from the first SRS resource set, and the second SRI field may select an SRS resource from the second SRS resource set. Similar to the plurality of SRI fields, in order to repeatedly transmit the PUSCH in consideration of multiple TRPs, the base station may select a TPMI corresponding to the SRS resource indicated by each SRI field. Single DCI including a plurality of TPMI fields It can be transmitted to the terminal. In this case, the plurality of TPMI fields may be indicated through the same DCI as the DCI including the plurality of SRI fields described above. On the other hand, a plurality of TPMIs to be used when transmitting a PUSCH to each TRP may be selected through the following methods using a plurality of TPMI fields:

[Method 1] Each TPMI field may be interpreted in the same way as in NR Release 15/16. For example, the first TPMI field may indicate the TPMI index and layer information for the SRS resource indicated by the first SRI field, and the second TPMI field is the TPMI index for the SRS resource indicated by the second SRI field and Layer information can be indicated.

[Method 2] The first TPMI field may indicate the TPMI index and layer information for the SRS resource indicated by the first SRI field in the same manner as in NR Release 15/16. In contrast, since the second TPMI field selects the TPMI index for the same layer as the layer indicated by the first TPMI field, layer information may not be indicated, and TPMI index information for the SRS resource indicated by the second SRI field can be instructed.

Meanwhile, when a plurality of TPMIs are selected through method 2, the bit length of the second TPMI field may be smaller than that of the first TPMI field. This is because the second TPMI field indicates a value (index) of one of the TPMI index candidates identical to the layer indicated by the first TPMI field, and thus may not indicate layer information.

The UE may support a dynamic switching method of receiving a single DCI including a plurality of SRI fields and a plurality of TPMI fields and determining repeated PUSCH transmission in consideration of multiple TRPs or repeated PUSCH transmission in consideration of single TRP based on this. The UE may support dynamic switching by using a reserved value that has no meaning among a plurality of TPMI fields or SRI fields included in the received DCI. For example, if the bit length of the SRI field is 2 bits, a total of 4 cases may be expressed, and each expressible case may be defined as a code point. In addition, if 3 codepoints out of 4 codepoints have a meaning of which SRI to indicate and the remaining 1 codepoint has no meaning, this codepoint is said to be a codepoint indicating a reserved value. (In the following description, a code point indicating a reserved value can be expressed as being set as reserved). It will be described in more detail through the content to be described later.

In order to describe a dynamic switching method that can be supported through reserved values of a plurality of TPMI fields as a specific example, it is assumed that the number of PUSCH antenna ports is 4. In addition, it is assumed that the first TPMI field consists of 6 bits, the upper layer parameter codebookSubset is set to fullyAndPartialAndNonCoherent, and is indicated in the same way as in NR Release 15/16. In this case, in the first TPMI field, indices 0 to 61 may be set to indicate valid TPMI indexes and layer information, and indices 62 to 63 may be set as reserved. If the second TPMI field includes only TPMI index information excluding layer information as in Method 2, the second TPMI field indicates that the layer for PUSCH transmission has one value (eg, 1 to 4 according to the first TPMI field). only one of the values of the TPMI index) can be indicated. In this case, the number of bits of the second TPMI field may be set based on the number of bits capable of expressing the layer with the most candidates among TPMI index candidates that can be set for each layer. For example, according to an example in which candidates 0 to 27 in layer 1, candidates 0 to 21 in layer 2, candidates 0 to 6 in layer 3, and candidates 0 to 4 in layer 4, the candidates of layer 1 are the most many. Therefore, the number of bits of the second TPMI field may be set to 5 according to the number of TPMI index candidates of layer 1. The second TPMI field configuration will be described in detail, for example, if the first TPMI field and the corresponding TPMI index are indicated, the UE sets the second TPMI field to one of the TPMI indexes 0 to 27 for the first layer. It can be interpreted as a code point indicating the value of , and a code point indicating a reserved value. As another example, if the first TPMI field indicates layer 2 and a corresponding TPMI index, the UE sets the second TPMI field to a code point indicating one of TPMI indices 0 to 21 for layer 2 and a reserved value It can be interpreted as a code point pointing to . Also, for example, when the first TPMI field indicates the 3rd or 4th layer and the corresponding TPMI index, the UE may interpret the second TPMI field similarly to the above. In this case, when two or more codepoints indicating a reserved value exist in the second TPMI field other than a codepoint indicating a TPMI index, codepoints indicating the two reserved values may be used to indicate dynamic switching. That is, among the code points of the second TPMI field composed of 5 bits, the second to last code point corresponding to the code point indicating the reserved value (ie, the 31st code point in the example) is the first TRP, and PUSCH repetition considering a single TRP. It may be used to indicate transmission, and the last codepoint (ie, the 32nd codepoint in the example) may be used to indicate repeated PUSCH transmission considering a single TRP as the second TRP. In this case, the UE may receive layer information and TPMI index information for repeated PUSCH transmission considering a single TRP as the first TPMI field. On the other hand, the assumption as described above is for convenience of description, and the present disclosure is not limited thereto.

For convenience of explanation, if the above specific example for two TRPs is generalized and described, the terminal receives a single DCI including two SRI fields and two TPMI fields, and according to the code point indicated by the second TPMI field Dynamic switching can be performed. If the codepoint of the second TPMI field indicates the TPMI index for the layer indicated by the first TPMI field, the UE may perform repeated PUSCH transmission in consideration of multiple TRPs. If the second TPMI field indicates the second to last codepoint corresponding to the codepoint indicating the reserved value, the UE may perform repeated PUSCH transmission considering a single TRP for TRP 1, and codebook-based PUSCH transmission You can check the layer information and TPMI index information for the TPMI from the first TPMI field. If the second TPMI field indicates the last code point corresponding to the code point indicating the reserved value, the UE may perform repeated PUSCH transmission considering a single TRP for TRP 2, and layer information for codebook-based PUSCH transmission and TPMI index information can be checked from the first TPMI field.

Meanwhile, although the above-described example uses two reserved code points at the end of the second TPMI field to indicate dynamic switching, the present embodiment is not limited thereto. That is, dynamic switching can be indicated by using codepoints indicating two different reserved values of the second TPMI field, and repeated PUSCH transmission considering a single TRP for TRP 1 or repeated PUSCH transmission considering a single TRP for TRP 2 is performed. It can be indicated by mapping to a code point indicating a reserved value.

In addition, although the above-described example describes a case in which the second TPMI field is determined by method 2, even when the second TPMI field is determined to be the same as in NR Release 15/16 as in method 1, the reserved code of the TPMI is the same as in the above-described example. Dynamic switching can be supported using points.

For example, if the number of code points indicating the reserved value of the second TPMI field is less than 2, the number of bits of the second TPMI field is increased by 1, and the second to last code point and the last code point are based on the increased number of bits. can be used to support dynamic switching.

When two TPMI fields are determined as in method 1, a method for supporting dynamic switching may be additionally considered depending on whether each TPMI field is indicated by a code point indicating a reserved value. That is, if the first TPMI field is indicated by a code point indicating a reserved value, the UE may perform repeated PUSCH transmission considering a single TRP for TRP 2, and if the second TPMI field is indicated by a code point indicating a reserved value, the UE may perform PUSCH repeated transmission considering a single TRP for TRP 1. If both TPMI fields indicate a code point for a TPMI rather than a code point indicating a reserved value, the UE may perform repeated PUSCH transmission in consideration of multiple TRPs. If there is no codepoint having a reserved value, the number of bits of the TPMI field is increased by 1, and the last codepoint can be used for supporting dynamic switching based on the increased number of bits.

On the other hand, as another method of supporting dynamic switching, dynamic switching is instructed by two SRI fields, and layer information and TPMI index information for repeated PUSCH transmission considering multiple TRP or single TRP from two TPMI fields are checked by the UE. can If one or more codepoints indicating a reserved value exist in each SRI field, dynamic switching may be supported depending on whether a corresponding SRI field indicates a codepoint indicating a reserved value. If the first SRI field indicates a code point indicating a reserved value and the second SRI field indicates an SRS resource of the second SRS resource set, the UE may perform repeated PUSCH transmission considering a single TRP for TRP 2. have. In this case, the UE may check layer information and TPMI index information from the first TPMI field in order to perform repeated PUSCH transmission considering a single TRP for TRP 2. If the second SRI field indicates a code point indicating a reserved value and the second SRI field indicates an SRS resource of the second SRS resource set, the UE performs PUSCH repeated transmission considering a single TRP for TRP 1. can In this case, the UE may check layer information and TPMI index information from the first TPMI field in order to perform repeated PUSCH transmission considering a single TRP for TRP 1. If both SRI fields indicate an SRS resource of each SRS resource set rather than a code point indicating a reserved value, the UE may perform repeated PUSCH transmission in consideration of multiple TRPs. At this time, the UE can check the layer information and TPMI index information from the first TPMI field to perform repeated PUSCH transmission for TRP 1, and the TPMI index from the second TPMI field to perform repeated PUSCH transmission for TRP 2 information can be checked. At this time, when transmitting the PUSCH for TRP 1 and TRP 2, the same layer may be set. If there is no codepoint indicating a reserved value in both SRI fields, the number of bits of each SRI field is increased by 1, and the last codepoint among the codepoints indicating a reserved value is supported for dynamic switching based on the increased number of bits. can be used for

<Example 1-6: Non-codebook-based dynamic switching method for determining PUSCH transmission considering single TRP or PUSCH transmission considering multiple TRP>

As an embodiment of the present disclosure, embodiments 1-6 describe a dynamic switching method for determining PUSCH transmission considering single TRP based on non-codebook or PUSCH transmission considering multiple TRPs.

According to embodiments 1-1 and 1-4, the base station receives a UE capability report from a UE capable of performing non-codebook based PUSCH repeated transmission in consideration of multiple TRP based on single DCI, and PUSCH through multiple TRP Upper layer signaling for performing repetitive transmission may be configured in the terminal. At this time, when repeatedly transmitting PUSCH considering multiple TRPs based on single DCI as in the 1-4 embodiments, the base station transmits a single DCI including a plurality of SRI fields to indicate SRS resources existing in different SRS resource sets. It can be transmitted to the terminal. Meanwhile, the plurality of SRI fields may be selected, for example, according to the following method.

[Method 1] Each SRI field may be selected in the same way as in NR Release 15/16. For example, the first SRI field may indicate an SRS resource for PUSCH transmission in the first SRS resource set, and the second SRI field may indicate an SRS resource for PUSCH transmission in the second SRS resource set.

[Method 2] The first SRI field may indicate SRS resource(s) for PUSCH transmission in the first SRS resource set in the same manner as in NR Release 15/16. The second SRI field may indicate SRS resource(s) for PUSCH transmission in the second SRS resource set for the same layer as the layer indicated by the first SRI field.

When a plurality of SRIs are selected through method 2, the bit length of the second SRI field may be smaller than that of the first SRI field. This is because the second SRI is determined among SRI candidates for the same layer as the layer determined as the first SRI field among SRI candidates for all supportable layers.

The UE may support a dynamic switching method of receiving a single DCI including a plurality of SRIs and determining repeated PUSCH transmission considering multiple TRPs or repeated PUSCH transmission considering single TRP based on the received single DCI. The UE may support dynamic switching by using a codepoint indicating reserved values of a plurality of SRI fields included in the received DCI.

In order to describe a dynamic switching method that can be supported through codepoints indicating reserved values of a plurality of SRI fields as a specific example, it is assumed that the maximum number of PUSCH antenna ports is 4 and the number of SRS resources in each SRS resource set is 4. In addition, it is assumed that the first SRI field consists of 4 bits and is indicated in the same way as in NR Release 15/16. In this case, in the first SRI region, indexes 0 to 14 may be set to indicate an SRS resource for PUSCH transmission and a layer according to the selected SRS resource, and index 15 may be set as a code point indicating a reserved value. If the second SRI field selects the same number of SRS resources as the number of layers indicated by the first SRI as in Method 2, the second SRI field has one value for the layer for PUSCH transmission according to the first SRI field. (For example, one value of 1 to 4) may indicate the SRS resource selection candidate in the case of limited. In this case, the number of bits of the second SRI field may be set based on a layer having the largest number of candidates among the number of SRS resource selection candidates for each layer. For example, the value of the SRI field indicating the SRS resource selection candidate for layer 1 is 0 to 3, and there are a total of four candidates, and the value of the SRI field indicating the SRS resource selection candidate for layer 2 is 4 to 9 There are a total of 6 candidates, and the value of the SRI field indicating the SRS resource selection candidate for layer 3 is 10 to 13. There are a total of 4 candidates, and the value of the SRI field indicating the SRS resource selection candidate for layer 4 is 14, there may be a total of one candidate. In this case, the number of bits of the second SRI field may be set to 3 because the number of candidates for layer 2 has the largest value with a total of 6 candidates. The second SRI field configuration is specifically described, for example, when the SRI value when the layer for PUSCH transmission is 1 is indicated by the first SRI field, the UE sets the second SRI field as the SRI candidate for the first layer. A code point indicating one of 0 to 3 or a value other than 0 may be interpreted as a code point having a reserved value. As another example, when the SRI value when the layer for PUSCH transmission is 2 is indicated by the first SRI field, the UE sets the second SRI field to a value of one of SRI candidates 0 to 5 for layer 2 Points or other values can be interpreted as code points having a reserved value. Also, for example, when the first SRI field indicates an SRI value when the layer for PUSCH transmission is 3 or 4, the UE may interpret the second SRI field in a similar manner. In this case, when two or more codepoints indicating a reserved value exist in the second SRI field other than a codepoint indicating an SRI value according to a layer, the codepoints indicating the two reserved values may be used to indicate dynamic switching. . That is, among the codepoints of the second SRI field composed of 3 bits, the second to last codepoint corresponding to the codepoint indicating the reserved value (ie, the 7th codepoint in the example) is the first TRP, and PUSCH repetition considering a single TRP. It is used to indicate transmission and the last codepoint (ie, the 8th codepoint in the example) may be used to indicate repeated PUSCH transmission considering a single TRP as the second TRP. In this case, the UE may be instructed by the first SRI field SRI for repeated PUSCH transmission considering a single TRP. On the other hand, the assumption as described above is for convenience of description, and the present disclosure is not limited thereto.

For convenience of description, if the above specific examples for two TRPs are generalized and described, the UE receives a single DCI including two SRI fields and performs dynamic switching according to the codepoint indicated by the second SRI field. have. If the codepoint of the second SRI field indicates the SRI value for the layer indicated by the first SRI field, the UE may perform repeated PUSCH transmission in consideration of multiple TRPs. If the second SRI field indicates the second to last code point corresponding to the code point indicating the reserved value, the UE may perform PUSCH repeated transmission considering a single TRP for TRP 1, and The SRI for PUSCH transmission may be identified from the first SRI field. If the second SRI field indicates the last code point corresponding to the code point indicating the reserved value, the UE may perform PUSCH repeated transmission considering a single TRP for TRP 2, and non-codebook based PUSCH transmission You can check the SRI for this from the first SRI field.

Meanwhile, in the above example, code points indicating two reserved values at the end of the second SRI field are used to indicate dynamic switching, but the present embodiment is not limited thereto. That is, dynamic switching can be indicated by using codepoints indicating two different reserved values of the second SRI field, and repeated PUSCH transmission considering a single TRP for TRP 1 or repeated PUSCH transmission considering a single TRP for TRP 2 is performed. It can be indicated by mapping to a code point indicating a reserved value.

In addition, although the above-described example describes the case in which the second SRI field is determined by method 2, even when the second SRI field is determined to be the same as in NR Release 15/16 as in method 1, the reserved SRI field is the same as in the above-described example. Dynamic switching can be supported by using a code point indicating a value.

For example, if the number of code points indicating the reserved value of the second SRI field is less than 2, the number of bits of the second SRI field is increased by 1, and the second to last code point and the last code point are calculated based on the increased number of bits. It can be used to support dynamic switching.

When two SRI fields are determined as in method 1, a method of supporting dynamic switching may be additionally considered depending on whether each SRI field is indicated by a code point indicating a reserved value. That is, if the first SRI field is indicated by a code point indicating a reserved value, the UE can perform repeated PUSCH transmission considering a single TRP for TRP 2, and if the second SRI field is indicated by a code point indicating a reserved value , the UE may perform repeated PUSCH transmission considering a single TRP for TRP 1. If both SRI fields indicate a code point for indicating an SRI rather than a code point indicating a reserved value, the UE may perform repeated PUSCH transmission in consideration of multiple TRPs. If there is no codepoint indicating the reserved value, the number of bits of the SRI region is increased by 1, and the last codepoint may be used for supporting dynamic switching based on the increased number of bits.

20 illustrates operations of a base station and a terminal for repeated PUSCH transmission in consideration of multiple TRP based on single DCI transmission in which a plurality of SRI or TPMI fields exist according to an embodiment of the present disclosure. The terminal supports whether to support repeated PUSCH transmission in consideration of single DCI-based multiple TRP, whether to support multiple SRI or TPMI fields, and whether to support dynamic switching between single/multi-TRP operations using the corresponding fields, and when changing a transmission beam to be described later in the second embodiment A UE capability report is performed on the transient offset related information (2051), and the base station receiving the corresponding UE capability report (2001) transmits a PUSCH repeated transmission configuration considering a single DCI-based multiple TRP to the UE (2002). At this time, as the transmitted configuration information, the repeated transmission method, the number of repeated transmissions, the transmission beam mapping unit or method, whether a plurality of SRI or TPMI fields can be supported, the SRS resource set for a plurality of codebooks or non-codebooks, and the second embodiment below When a transmission beam is changed, which will be described later in , information related to a transient offset may be included. Upon receiving the configuration, the UE may check the number of repeated transmissions of PUSCH transmission based on the configuration through higher layer signaling (2052) or the time resource allocation field in DCI. At this time, if the number of repeated transmissions is not greater than 1 (2003, 2053), that is, if the repeated transmission is not performed, the UE may perform the first PUSCH transmission operation (2004, 2054). The first PUSCH transmission operation uses one SRI and TPMI field in the case of codebook-based PUSCH transmission, and one SRI field in the case of non-codebook-based PUSCH transmission, that is, single transmission of PUSCH in a single TRP using one transmission beam. It may be an action to If the number of repeated transmissions is greater than 2 (2003, 2053), if the terminal does not receive a plurality of SRI or TPMI field supportable configurations from the base station (2005, 2055), the terminal may perform the second PUSCH transmission operation There are (2006, 2056). The second PUSCH transmission operation uses one SRI and TPMI field in the case of codebook-based PUSCH transmission, and one SRI field in the case of non-codebook-based PUSCH transmission, that is, using one transmission beam to repeatedly transmit PUSCH in a single TRP. is an action to On the other hand, if the terminal has received a plurality of SRI or TPMI field supportable settings from the base station (2005, 2055), and a plurality of SRI or TPMI fields in the DCI received by the terminal, a code point meaning multiple TRP-based repeated transmission If a codepoint indicating single TRP-based repeated transmission is indicated as described above in embodiments 1-5 and 1-6 without indicating (2007, 2057), the UE may perform a third PUSCH transmission operation ( 2008, 2058). In the third PUSCH transmission operation, the UE uses two SRI and TPMI fields in the case of codebook-based PUSCH transmission, and two SRI fields in the case of non-codebook-based PUSCH transmission. Codepoint indicating single TRP transmission among codepoints in each field. It is an operation of repeatedly transmitting the PUSCH in a specific single TRP through, that is, using one transmission beam. Therefore, repeated transmission to the first or second TRP may be indicated depending on which codepoint is indicated through a plurality of SRI or TPMI fields. If the terminal has received a plurality of SRI or TPMI field supportable settings from the base station (2005, 2055), and the terminal indicates a code point indicating multiple TRP-based repeated transmission through a plurality of SRI or TPMI fields in the received DCI (2007, 2057), the UE may perform a fourth PUSCH transmission operation (2009, 2059). In the fourth PUSCH transmission operation, the UE uses two SRI and TPMI fields in the case of codebook-based PUSCH transmission, and two SRI fields in the case of non-codebook-based PUSCH transmission. Code indicating transmission of a plurality of TRPs among codepoints in each field. It is an operation of repeatedly transmitting a PUSCH through a point, that is, using two transmission beams in a plurality of TRPs.

<Second embodiment: time interval definition and uplink signal transmission method considering terminal capability report>

In an embodiment of the present disclosure, the UE defines a time interval that may be required between a plurality of uplink transmissions (eg, it can be expressed as a transient period, a transient offset, a transient gap, etc.) to perform a UE capability report or from the base station may be set, and in consideration of this, a corresponding time interval may be applied between each uplink transmission when transmitting an uplink signal. In order to transmit an uplink signal, the terminal may change at least one of an uplink beam, transmit power, and a frequency before transmitting the uplink signal. Also, the UE may change a panel before transmitting the uplink signal in order to transmit the uplink signal. Accordingly, the UE may change at least one of an uplink beam, transmission power, frequency, and panel before transmitting an uplink signal in order to transmit an uplink signal. Here, for example, when a plurality of beams are divided into a plurality of beam groups, the panel is set to correspond to each beam group, such as panel #1 in beam group #1, panel #2 in beam group #2, .. can be As another example, when a plurality of antenna modules for beam forming in a terminal exist and the plurality of antenna modules are installed at different positions, the panel may be configured to correspond to each antenna module. In addition, a plurality of panels may be set in various ways to distinguish a plurality of beams having different beam widths, beam directions, and the like. This change for uplink signal transmission may be performed in the following cases:

- Case 1) When an uplink signal (eg, PUCCH or PUSCH or SRS, etc.) is repeatedly transmitted with multiple TRPs, when changing the uplink beam or transmission power or frequency to change the TRP between repeated transmissions, Or when the terminal changes the panel to transmit by changing the TRP between repeated transmissions

- Case 2) When the base station instructs the uplink signal transmission by L1 signaling including DCI or MAC CE signaling, when the terminal changes the uplink beam or transmission power or frequency to transmit the uplink signal, or the terminal changes the uplink signal When changing the panel to transmit the link signal

- Case 3) When SRS transmission is indicated or configured, when a plurality of SRS resources included in the SRS resource set are used or the uplink beam or transmission power or frequency is changed to use a plurality of SRS resource sets, or when the terminal changes the SRS When changing panels for transfer

The case of changing transmission information for TRP change between repeated transmissions in Case 1 may be determined according to a mapping pattern between repeated transmission and TRP. Here, repeated transmission means, for example, a case of transmitting the same uplink signal. In the 3GPP Release 16 standard, when the base station repeatedly transmits the PDSCH, two mapping patterns (eg, 'Sequential' and 'Cyclical') are supported. A mapping pattern for repeatedly transmitting the PDSCH to a plurality of TRPs may be applied to the UE to repeatedly transmitting an uplink signal to a plurality of TRPs. 'Sequential' mapping is, for example, {TRP1, TRP1, TRP2, TRP2}, in which TRP is changed and transmitted in two repeated transmission units. 'Cyclical' mapping is, for example, {TRP1, TRP2, TRP1, TRP2} It is a method of transmitting by changing the TRP for every repeated transmission as shown. When at least one of an uplink beam, transmission power, and transmission frequency (or frequency hop) for transmitting an uplink signal with a plurality of TRPs is determined, the terminal applies uplink transmission change information determined according to the mapping method to uplink signal can be transmitted. Alternatively, when a panel for transmitting an uplink signal through a plurality of TRPs is determined, the terminal may transmit the uplink signal by applying the uplink transmission change information determined according to the above-described mapping method. Here, the uplink transmission change information may mean at least one of an uplink beam for transmitting an uplink signal, a transmission power, and a transmission frequency. Alternatively, the uplink transmission change information may mean a panel for transmitting an uplink signal. When repeatedly transmitting a PUSCH with multiple TRPs, for example, it may include both PUSCH repeated transmission type A and PUSCH repeated transmission type B. PUSCH repetitive transmission type B can consider both nominal repetition and actual repetition as a repetition transmission unit.

In Case 2, the base station sets higher layer parameters for uplink signal transmission to the terminal, and instructs the terminal to transmit an uplink signal (eg, PUCCH or PUSCH or SRS) through L1 signaling (eg, DCI). can do. In this case, the time interval between the signaling instructing the base station to transmit the uplink signal to the terminal and the uplink signal transmitted by the terminal is defined as 'time offset', which is 'scheduling interval', 'scheduling offset', and 'time interval'. , 'transient period', 'transient offset', 'transient time', etc. may be replaced. When the base station instructs the terminal to transmit an uplink signal by L1 signaling including DCI, the time offset is 'from the last symbol in which the PDCCH including DCI is transmitted on the uplink (eg, aperiodic/semi-persistent SRS or It may be calculated as 'before the first symbol in which the PUSCH or PUCCH including the HARQ-ACK for the PDSCH) is transmitted. If the DCI decoding time of the UE is additionally considered, the time offset may be calculated as 'from the last symbol in which a PDCCH including DCI is transmitted to before the first symbol in which an uplink signal is transmitted'. When the base station instructs transmission of an uplink signal through MAC CE signaling, the time offset may be calculated by the following method.

- Method 1: From the end of the last symbol in which the PDSCH including MAC CE signaling is transmitted until the start of the first symbol in which the uplink signal (eg, aperiodic/semi-persistent SRS) is transmitted

- Method 2: From the end of the last symbol in which the PUCCH/PUSCH including the HARQ-ACK for the PDSCH including the MAC CE signaling ends to the start of the first symbol in which the uplink signal is transmitted

- Method 3: MAC CE application delay time from the time when the last symbol in which PUCCH/PUSCH including HARQ-ACK for PDSCH including MAC CE signaling is transmitted (eg, until the first slot after 3 ms has elapsed) After this, until the first symbol in which the uplink signal is transmitted starts

Such a time offset may be converted into an absolute time unit (eg, ms) or a symbol unit. When the UE is instructed to transmit an uplink signal from the base station, the UE may change at least one of an uplink beam, a transmission power, and a frequency for uplink transmission during a time offset. Alternatively, the UE may change the panel for uplink transmission during the time offset.

When the UE transmits the SRS scheduled by the base station in Case 3, the UE may transmit by changing the uplink beam, transmission power and frequency according to the upper layer setting of the SRS resource included in the SRS resource set to be transmitted. Alternatively, the UE may transmit the SRS by changing the panel according to the upper layer configuration of the SRS resource.

The UE may need a transition time to change at least one of an uplink beam, transmit power, and a frequency according to UE capability. Alternatively, the UE may need a switching time to change the panel for uplink transmission according to UE capability. Such a switching time may be considered, for example, in the case of being repeatedly transmitted in units of long subslots or repeatedly transmitted in units of short subslots. The switching time according to UE capability may be applied to some or all of an uplink beam or transmission power or frequency determined for transmitting an uplink signal according to whether it is satisfied between repeated transmissions of the uplink signal or during a time offset. As described above, a certain time may be required to perform the uplink beam or transmission power or frequency change, and to satisfy this, an offset interval is added between repeated transmissions, or the base station is configured so that the time offset is greater than a certain time for the change. Uplink signal transmission may be instructed to the terminal. Alternatively, a certain time may be required even when panel change for uplink transmission is additionally performed. To satisfy this, an offset interval is added between repeated transmissions or the base station transmits an uplink signal so that the time offset is greater than a predetermined time for the change. can be instructed to the terminal.

Hereinafter, in the present disclosure, the offset in the time domain for uplink transmission of the terminal may be understood as encompassing the time offset or the time interval between repeated transmissions of the uplink signal.

In the present disclosure, a method for a base station to determine an offset in a time domain for ensuring a time required to change an uplink beam or transmission power or frequency according to a terminal capability, and a method for a terminal to transmit an uplink signal indicated by the base station Specific examples of the method will be described in detail through Examples 2-1 and 2-2. The following 2-1 embodiment and the 2-2 embodiment are divided for convenience of description, and the embodiments of the present disclosure may be implemented by combining at least one embodiment as well as each.

<Embodiment 2-1: Method of determining the offset of the base station according to the terminal capability report and setting the offset in the terminal>

As one example of a method for determining an offset in the time domain for uplink signal transmission, the terminal changes the frequency in consideration of UE capability for performing uplink beam change to the base station, UE capability for performing transmission power change, frequency hopping, etc. UE capability information including at least one of UE capabilities for performing ? may be reported to the base station. Alternatively, each of the three UE capabilities may be individually reported to the base station. Also, the UE may select and report some of the three UE capabilities. In addition, the UE may report a representative value of UE capability for changing the transmission configuration of the uplink signal.

In addition, if the terminal can transmit an uplink signal using a plurality of panels, UE capability for panel change may be considered together in the step of determining the UE capability to be reported. That is, it includes at least one of UE capability for performing uplink beam change, UE capability for performing transmission power change, UE capability for performing frequency change in consideration of frequency hopping, and UE capability for performing panel change. terminal capability information may be reported to the base station. Alternatively, each of the four UE capabilities may be individually reported to the base station. In addition, the UE may select and report some of the four UE capabilities. In addition, the UE may report a representative value of UE capability for changing the transmission configuration of the uplink signal.

Hereinafter, the terms UE capability and terminal capability information or terminal capability that are used interchangeably in the present disclosure may be understood to have the same meaning.

As described above, the UE reporting UE capability to the base station is information necessary for the base station to determine an offset when the UE changes some or all of an uplink beam or transmission power or frequency when transmitting an uplink signal. to provide the base station. In addition, if the terminal supports a plurality of panels, the base station may provide information necessary for the base station to determine the offset in case of changing the panel to the base station. The UE may report UE capability for each uplink beam change or transmission power or frequency change using one of the following methods. Additionally, UE capability for panel change may also be reported using one of the following methods:

- UE capability for uplink transmission configuration change of NR Release 15/16 may be reported. For example, the UE may set 'beamSwitchTiming' to one of {14, 28, 48} as in NR Release 15/16 for reporting UE capability for beam change and report it to the base station. The terminal may set 'beamSwitchTiming' to one of {224, 336} for reporting UE capability for panel change and report it to the base station. Here, the number indicating the 'beamSwitchTiming' is a symbol unit, for example, when 'beamSwitchTiming' is set to "224" in the UE capability report for panel change, the processing time for beam switching in UE capability for panel change is 224 It means that it takes as long as the symbol. In addition, the 'beamSwitchTiming' may be set for each subcarrier spacing.

- The required time for change may be reported in symbol or absolute time units (eg, ms).

- The base station and the terminal may pre-define a processing time capable of indicating processing capability. The processing time for N processing powers can be predefined, and the processing time can be different depending on the subcarrier interval. The following [Table 41] and [Table 42] show examples of processing times defined in advance by the base station and the terminal for processing capabilities n and n+1 for uplink beam or transmission power or frequency change. Here, the value of the Required time area may be set such that, for example, a relationship of {a1<a2<a3<a4}, {b1<a1, b2<a2, b3<a3} is established. The unit of required time may be set to symbol or ms.

[Table 41]

[Table 42]

When the UE reports the processing time for changing at least one of the uplink beam, transmission power, and frequency as UE capability, the UE may determine a reported value in consideration of each uplink signal. For example, when reporting the processing time for uplink beam change as UE capability, it is divided into UE capability for beam change for PUCCH, UE capability for beam change for PUSCH, and UE capability for beam change for SRS. can report UE capability for transmission power change and capability for frequency change may also be reported separately according to PUCCH, PUSCH, or SRS. When the UE reports UE capability for changing at least one of uplink beam, transmission power, and frequency for PUCCH, the number of PUCCH resources, the number of configured spatial relation info, the number of activated spatial relation info, and frequency hopping It can be decided by considering settings, etc. When the UE reports each uplink beam for PUSCH, transmission power, and UE capability for frequency change, PUSCH precoding method (eg, 'Codebook' or 'Non-codebook'), SRS resource related to PUSCH transmission It can be determined in consideration of the number of sets, the number of SRS resources set in the related SRS resource set, the relationship between the PUSCH and the SRS antenna port, and the frequency hopping configuration. When the UE reports each uplink beam for SRS, transmission power, and UE capability for frequency change, SRS transmission indication method (eg, DCI-based or MAC CE-based), SRS time axis information (eg, periodic SRS or semi-persistent SRS or aperiodic SRS), the use of SRS (eg, 'beamManagement' or 'codebook' or 'nonCodebook' or 'antennaSwitching'), the number of SRS resource sets, the number of SRS resources, etc. can be decided by In addition, the terminal supporting the multi-panel may determine the reported value in consideration of the uplink signal when reporting the processing time for panel change as UE capability. Alternatively, the UE may determine and report UE capability for at least one change of an uplink beam, transmission power, and frequency without distinguishing the UE capability for each uplink signal. The UE may determine and report the UE capability for the panel change without distinguishing the UE capability for each uplink signal.

The UE may additionally report UE capability for indicating whether the uplink beam, transmission power, and frequency can be changed simultaneously or sequentially, respectively. Here, the terminal supporting the multi-panel may report whether the panel can be changed at the same time as the corresponding UE capability. That is, the UE may report whether the uplink beam, transmission power, frequency, panel, etc. can be changed simultaneously with the corresponding UE capability. As an example of the corresponding UE capability, the UE may select and report one of 'simultaneous' or 'sequential' to the base station. If the UE reports UE capability as 'simultaneous', it means that the UE can change the uplink beam, transmission power, and frequency at the same time. A terminal supporting multiple panels means that the panel can also be changed at the same time. If the UE reports UE capability as 'sequential', it means that the UE can sequentially change the uplink beam, transmission power, and frequency. A terminal supporting multiple panels further means that the panels can be sequentially changed.

The UE may report UE capability 'beamCorrespondenceWithoutUL-BeamSweeping' to the base station in addition to reporting UE capability for supporting the uplink beam, transmission power, frequency, and panel change to indicate whether the beam correspondence request is satisfied. The beam correspondence refers to the ability of the UE to select a beam for uplink transmission based on downlink measurement without relying on uplink beam sweeping. If the UE reports that 'beamCorrespondenceWithoutUL-BeamSweeping', which is the UE capability for the beam correspondece, can be supported ('supported'), the UE selects an uplink beam for uplink transmission without uplink beam sweeping and uses it An uplink signal may be transmitted.

The base station may determine an offset for securing a request time for applying uplink transmission change information based on the UE capability reported by the terminal. The base station may determine the offset in consideration of one or a combination of the following:

- Option 1) The offset may be determined based on the largest value for at least one of UE capability for uplink beam change, UE capability for transmit power change, and UE capability for frequency change reported from the UE.

- Option 2) Determination of an offset based on the largest value among UE capabilities for a change required to perform actual uplink transmission among UE capabilities reported from the UE. For example, when the base station instructs the terminal to perform an uplink signal to change only the uplink beam and the transmission power, the offset is determined based on the largest value among the UE capability for changing the uplink beam and the UE capability for changing the transmission power. can The offset may be determined in the same manner as in the above example for uplink transmission change information combinations other than the above example.

- Option 3) The offset may be determined based on the sum of UE capability for uplink beam change, UE capability for transmit power change, and UE capability for frequency change reported from the UE.

- Option 4) The offset may be determined based on the sum of UE capabilities for a change required to actually perform uplink transmission among UE capabilities reported from the UE. For example, when the base station instructs the terminal to perform an uplink signal to change only the uplink beam and transmit power, the offset may be determined based on the sum of the UE capability for the uplink beam change and the UE capability for the transmit power change. . The offset may be determined in the same manner as in the above example for uplink transmission change information combinations other than the above example.

- Option 5) When determining the offset through one of the options 1 to 4, the offset may be determined in consideration of the configuration of each uplink transmission signal. For example, when the base station determines the offset for repeatedly transmitting the PUCCH to a plurality of TRPs as the option 1, the offset may be determined based on the UE capability reported by the UE in consideration of the PUCCH configuration. Alternatively, when the UE does not report the UE capability by dividing it for each uplink signal, the base station may determine the offset by estimating an additional request time due to PUCCH configuration in the UE capability reported by the UE. This may be applied when the base station determines an offset for transmitting another uplink signal (eg, PUSCH or SRS).

- Option 6) When the offset is determined through one of the options 1 to 4, the offset may be determined without distinguishing the configuration of each uplink transmission signal.

- Option 7) The base station may determine an arbitrary value as the offset. In this case, the upper layer parameter setting of the uplink signal, the uplink resource setting, etc. may be considered.

- Option 8) If the terminal supports multiple panels, when determining the offset through the options 1 to 6, it may be determined by additionally considering the UE capability for panel change.

Each option is an example of a case in which the UE reports all UE capabilities for the above three uplink transmission change information. can decide

For example, when the terminal reports that the uplink beam, transmission power, and frequency can be changed simultaneously, the base station may select option 1 or option 2 to determine the offset. Alternatively, when the terminal reports that the uplink beam, transmission power, and frequency can be sequentially changed, the base station may select option 3 or option 4 to determine the offset. When the terminal supports multiple panels and reports that the uplink beam, transmission power, frequency, and panel (or at least two or more of them) can be changed at the same time, the base station sets the UE capability for panel change to option 1 according to option 8 The offset may be determined by additional consideration, or the offset may be determined by additionally considering the UE capability for panel change in option 2 according to option 8. This is an example of the above embodiment, and the base station may determine the offset in consideration of one or a combination of options 1 to 8 described above according to the UE capability reported by the terminal.

The base station may adjust the offset value determined by the above-described option according to whether the terminal supports the beam correspondent reported through the UE capability. For example, if the terminal supports beam correspondence, the base station may determine the offset value determined through the above option as the final offset value or adjust it to a smaller value. On the other hand, if the terminal does not support beam correspondence, the base station may add the additional request time to the offset value determined through the above option.

The base station may adjust the offset value determined by the above-described option according to whether the terminal reports an uplink beam for transmitting uplink for multiple TRP. This may mean that if the uplink beam is reported to the base station, the corresponding uplink beam is a 'known' beam for the terminal. If the uplink beam is not reported to the base station, it may mean that the corresponding uplink beam is an 'unknown' beam for the terminal. If the terminal reports the uplink beam to be transmitted to the base station, the base station may determine the offset value determined through the above option as the final offset value or may adjust it to a smaller value. On the other hand, if the terminal does not report the uplink beam for uplink transmission to the base station, the base station may add the additional request time to the offset value determined through the option.

The base station may inform the terminal of the determined offset. In this case, the base station may explicitly or implicitly inform the terminal of the offset:

- When the base station explicitly sets the determined offset to the terminal: The base station may explicitly inform the terminal by setting the offset as a new higher layer parameter. As an example, a new higher layer parameter 'timeDurationForULSwitch' may be added to configuration information for PUCCH transmission such as PUCCH-FormatConfig or PUCCH-Config. Similarly for PUSCH or SRS, a new parameter for offset may be added to a higher layer parameter for PUSCH transmission and a higher layer parameter for SRS transmission. The above example is one of the methods of setting a new higher layer parameter for indicating the offset determined by the base station to the terminal, and may be defined as a higher layer parameter with a different name having the same function.

- When the base station implicitly indicates the determined offset: The base station implicitly indicates the offset through setting(s) for transmitting an uplink signal other than directly setting the offset as a higher layer parameter as in the above operation. can As an example, it may be indicated through the 'startingSymbolIndex' set in the higher layer parameter PUCCH-Resource in PUCCH-format[a] (where a is, for example, 0, 1, 2, 3 or 4). More specifically, as an example of one of the reinforcement methods for indicating repeated transmission of PUCCH in a slot, the startingSymbolIndex in PUCCH-format[a] of PUCCH-Resource may be set as many times as the number of times that PUCCH in the slot is repeated. As a detailed example, if the number of repetitions in the slot is, for example, 2, the startingSymbolIndex indicates the transmission start symbol of the first PUCCH repeated transmission occasion in the slot, and 'startingSymbolIndex2' that can be newly added is the transmission start symbol of the second PUCCH repeated transmission occasion in the slot. can be instructed. In this case, the symbol position indicated by startingSymbolIndex must be earlier than the symbol position indicated by startingSymbolIndex2, and the interval between two symbols can be set by the base station so that it becomes a value greater than the offset determined by one PUCCH transmission symbol nrofSymbols and the base station. The above example is one example, and the base station may inform the terminal of the offset implicitly through PUCCH resource configuration for PUCCH transmission, etc. Alternatively, when the base station schedules the PUCCH including the HACK information of the PDSCH to the terminal, the PDSCH-to-HARQ_feedback timing indicator may be indicated to the terminal so that the time offset becomes a larger value than the determined offset. For uplink signals other than PUCCH (eg, PUSCH or SRS), the offset may be implicitly notified to the UE through the transmission timing indicated by the upper layer parameter setting of the uplink signal or DCI.

<Embodiment 2-2: A method of transmitting an uplink signal indicated from a base station according to a terminal capability>

When the terminal is instructed to repeatedly transmit an uplink signal from the base station, the terminal may determine an operation for repeated uplink transmission according to whether the offset determined by the base station is explicitly set or is implicitly indicated. If the terminal explicitly receives an offset from the base station, the terminal may transmit an uplink signal by setting an interval between repeated transmissions according to the offset in the time domain. If the terminal is implicitly instructed to offset, it transmits the uplink signal according to the upper layer parameter setting for the uplink signal set from the base station. When the terminal receives an offset explicitly or implicitly indicated by the base station and applies it to repeated transmission of an uplink signal, according to the capability of the terminal, at least one of an uplink beam, a transmission power, and a frequency is changed and transmitted during the offset. can If the offset determined by the base station is set larger than the UE capability for changing the uplink beam or transmission power or frequency, the terminal changes the uplink beam or transmission power to transmit by changing the TRP between repeated transmissions, or for frequency hopping, etc. You can change the frequency. If the offset determined by the base station is set to be smaller than the UE capability for changing the uplink beam or transmission power or frequency, in consideration of one or a combination of the following operations to repeatedly transmit the uplink signal, the base station and the terminal A default uplink transmission method can be defined in advance:

- Transmitting an uplink signal with the same uplink beam, transmission power, and frequency as the previous repeated transmission: The UE can satisfy the time for changing the beam or transmission power or frequency between repeated transmissions because the offset determined by the base station is smaller than the UE capability. none. Accordingly, the UE may perform the next repeated transmission with the beam, transmission power and frequency applied to the previous repeated transmission. Here, the previous repeated transmission means a repeated transmission occasion immediately before the repeated transmission occasion to be transmitted. In addition, it is also possible to use at least one of the uplink beam, transmission power, and frequency in the same manner as in the previous (repeated) transmission, and change the rest. For example, the uplink beam and frequency may be used the same as in the previous (repeated) transmission, and the transmission power may be changed during the next repeated transmission.

- Transmitting an uplink signal with the uplink beam, transmission power, and frequency set by default: The UE cannot satisfy the time for changing the beam or transmission power or frequency between repeated transmissions because the offset determined by the base station is smaller than the UE capability. Accordingly, the UE may perform the next repeated transmission with the predefined default uplink beam, default transmission power, and default frequency. Here, the base station and the terminal may define default transmission information for each uplink signal (PUCCH, PUSCH, or SRS). Alternatively, the base station and the terminal may define default transmission information for the uplink signal in common. In addition, it is possible to use at least one of the uplink beam, transmit power, and frequency as a default setting and change the rest. For example, it is possible to use the uplink beam and frequency as a default setting and to change the transmission power during the next repeated transmission.

- Transmit an uplink signal by conditionally changing the uplink beam or transmission power or frequency: When the mapping between uplink repeated transmission and TRP is set to 'Sequential', in a repeated transmission occasion satisfying UE capability, uplink beam or transmission power Alternatively, it can be transmitted by changing the frequency. The UE may transmit an uplink signal in the same configuration as the previous repeated transmission occasion on a repetitive transmission occasion that does not satisfy UE capability. For example, if the mapping is set as {TRP1, TRP1, TRP2, TRP2}, the first two repeated transmission occasions are transmitted with an uplink beam, transmission power and frequency for TRP1. The third repeated transmission occasion should be transmitted by changing the uplink beam, transmission power, and frequency for TRP2, but since the offset is smaller than UE capability, the UE transmits an uplink signal with the configuration for TRP1 without changing uplink transmission information. The UE may transmit the fourth repeated transmission occasion by changing the uplink beam, transmission power, and frequency for TRP2.

- Uplink repeated signal transmission by applying a changeable setting of uplink beam or transmission power or frequency: When the terminal compares the size between the offset set by the base station and the UE capability, the terminal changes some of the UE capabilities that are smaller than the offset among the UE capabilities Possible settings can be applied to the next repeated transmission occasion. For example, if the offset is greater than the UE capability for uplink beam change and smaller than the UE capability for other transmit power change or frequency change, the UE changes only the uplink beam and the transmit power and frequency are applied the same as the previous repeated transmission occasion. to transmit the next repeated transmission occasion. If the UE sequentially changes the uplink beam, transmission power, and frequency, the offset determined by the base station is compared with the sum of the UE capability combination for changing the uplink beam or transmission power or frequency. At this time, if the value for a plurality of combinations is less than the offset, it is determined according to the priority of the uplink beam or transmission power or frequency change determined in advance between the base station and the terminal. For example, the offset determined by the base station is smaller than the sum of all UE capabilities, and the sum of UE capabilities for uplink beam and transmit power change, the sum of UE capabilities for uplink beam and frequency change, and UE for transmit power and frequency change If the sum of capabilities is less than the offset and the base station and the terminal have previously defined the order of priority, for example, {uplink beam > transmission power > frequency}, the terminal changes the uplink beam and transmission power to obtain an uplink signal. can send

- Uplink signal transmission by dropping some symbols or repeated transmission occasions: The UE applies uplink transmission change information to repeatedly transmit uplink signals, the front part of which changes at least one of beam, transmission power, and frequency A symbol can be dropped and transmitted over the remaining resources. For example, if the mapping between repeated PUCCH transmission and TRP is set as {TRP1, TRP1, TRP2, TRP2}, in the third repeated transmission, the uplink beam for TRP2, transmission power, and the required time to change the frequency are satisfied. PUCCH is not transmitted during the preceding symbol until After satisfying the required time for changing the uplink beam, transmission power, and frequency, the UE may repeatedly transmit the third PUCCH for the remaining symbols.

In another example, if the UE does not satisfy the required time for changing the uplink beam or transmission power or frequency for repeated transmission in which the TRP is changed, the UE may drop the corresponding uplink repetitive transmission occasion. For example, if the mapping between PUCCH repeated transmission and TRP is set as {TRP1, TRP1, TRP2, TRP2}, the third PUCCH repeated transmission occasion may be dropped. Thereafter, the fourth PUCCH repeated transmission occasion may be transmitted by changing the uplink beam, transmission power, and frequency for TRP2. As another example, if the mapping between PUCCH repeated transmission and TRP is set as {TRP1, TRP2, TRP1, TRP2}, the second and fourth PUCCH repeated transmission occasions are dropped, and it can be supported as a single TRP-based PUCCH repeated transmission.

When repeated PUCCH transmission is performed in consideration of the channel state for each TRP through the method provided in the above-described embodiments of the present disclosure, an increase in coverage of an uplink control signal can be expected. In addition, since the transmission power is controlled for each transmission/reception point, efficient battery management of the terminal can be expected.

This can be equally applied to a size relationship between a time offset for uplink signal transmission and UE capability. If the time offset is greater than the UE capability for changing the uplink beam or transmission power or frequency, the UE may transmit the uplink signal. If the time offset is smaller than the UE capability for changing the uplink beam or transmission power or frequency, similar to the case in which the above offset between repeated transmissions does not satisfy the UE capability, the UE considers one or a combination of the following operations to perform an uplink. A link signal can be transmitted.

- The uplink signal is transmitted with the same uplink beam, transmission power, and frequency as the previous uplink signal transmission.

- Transmits an uplink signal with the uplink beam, transmission power and frequency set by default

- Uplink repetitive signal transmission by applying a changeable setting of uplink beam or transmission power or frequency

- Uplink signal transmission by dropping some symbols of the first repeated transmission occasion or the first repeated transmission occasion

The operations according to the above conditions have been described with respect to a method for a terminal supporting a single panel to change an uplink beam or transmit power or frequency. If the terminal can support multiple panels, the terminal checks whether the offset determined by the base station is set smaller than the UE capability for uplink beam or transmission power or frequency or panel change. If the offset determined by the base station is greater than the UE capability for changing the uplink beam or transmission power or frequency or panel, the terminal may transmit the uplink signal. If the offset is set to be smaller than the UE capability for changing the uplink beam or transmission power or frequency or the panel, similarly to the case where the offset between repeated transmissions does not satisfy the UE capability, the UE additionally adds the UE capability for changing the panel. Taking this into consideration, the uplink signal may be transmitted according to one or a combination of the following operations.

- The uplink signal is transmitted through the same uplink beam, transmission power, frequency, and panel as in the previous uplink signal transmission.

- Transmits uplink signal to the uplink beam, transmission power, frequency and panel set as default

- Uplink repetitive signal transmission by applying a changeable setting among uplink beam or transmission power or frequency or panel

- Uplink signal transmission by dropping some symbols of the first repeated transmission occasion or the first repeated transmission occasion

Here, the previous uplink signal means the most recently transmitted physical channel that is the same as the uplink signal (PUCCH, PUSCH, or SRS) to be transmitted. The base station and the terminal may define default transmission information for each uplink signal (PUCCH, PUSCH, or SRS). Alternatively, the base station and the terminal may define default transmission information for the uplink signal in common.

<Third embodiment: Aperiodic CSI reporting multiplexing method in case of repeated PUSCH transmission considering multiple TRP>

As an embodiment of the present invention, when the UE is configured with a multi-TRP-based PUSCH repetition transmission scheme A or B and receives a transport block transmission schedule, various methods for multiplexing aperiodic CSI reporting to specific PUSCH repetition(s) are considered. can PUSCH repetition considered below may be nominal repetition or actual repetition. In addition, when the UE determines the PUSCH repetition for multiplexing the aperiodic CSI report, if the corresponding PUSCH repetition has a length of one OFDM symbol, it may be excluded. The UE may report whether to support the function of multiplexing aperiodic CSI reporting to a plurality of PUSCH repetitions as UE capability.

[Method 1-1] According to one disclosure, the UE may multiplex the aperiodic CSI report only for the first PUSCH repetition of all PUSCH repetitions.

[Method 1-2] According to one disclosure, the UE may multiplex the aperiodic CSI report to two PUSCH repetitions among the entire PUSCH repetitions. At this time, the UE may determine that the first PUSCH repetition among the two PUSCH repetitions for multiplexing the aperiodic CSI report is the first PUSCH repetition to which the first transmission beam is applied. In addition, the UE may determine the second PUSCH repetition among the two PUSCH repetitions for multiplexing the aperiodic CSI report through the following detailed methods. According to one disclosure, aperiodic CSI reporting of the same information may be multiplexed for each PUSCH repetition. In other words, CSI part 1 or CSI part 2 information of the same information may be multiplexed.

[Method 1-2-1] Following Method 1-2, the UE may determine the second PUSCH repetition as the first PUSCH repetition to which the second transmission beam is applied. At this time, the UE may multiplex the aperiodic CSI report to the two PUSCH repetitions regardless of whether the two determined PUSCH repetitions have the same or different OFDM symbol lengths. In this case, if the two PUSCH repetitions have different OFDM symbol lengths, soft combining is impossible in the base station, and only selection diversity can be obtained by decoding the two PUSCH repetitions, respectively.

[Method 1-2-2] Following Method 1-2, the UE determines the aperiodic CSI report in which the OFDM symbol length of the first PUSCH repetition to which the second transmission beam is applied is determined in Method 1-2 is the first PUSCH to be multiplexed. You can limit it to have the same length as repetition. As an example, the UE may adjust the transient period so that two PUSCH repetitions determined for multiplexing the aperiodic CSI report have the same length when changing a beam between two transmission beams. That is, by increasing the length of the transient period that exists between nominal repetitions in which the transmission beam is changed, the OFDM symbol length between the first actual repetitions of each transmission beam can be made equal. For example, if there is no OFDM symbol position set to the invalid symbol, the transmission beam mapping method of multiple TRP-based PUSCH repetition is sequential, the OFDM symbol length for the nominal repetition of the PUSCH repetition transmission method B is 6, and the number of repeated transmissions is 4, the first nominal repetition can be transmitted in OFDM symbols 1 to 6 of slot 1 by mapping the first transmission beam, and the second nominal repetition is by mapping the first transmission beam to OFDM symbols 7 to 12 of slot 1 can be transmitted from Since the third nominal repetition is the first nominal repetition that is changed and mapped from the first transmission beam to the second transmission beam, a transient period may exist between the second and third nominal repetitions. If the length of the transient period requires one OFDM symbol length, the third nominal repetition can be transmitted in OFDM symbol 14 of slot 1 to OFDM symbol 5 of slot 2, and can be divided into two actual repetitions at the slot boundary. can The first actual repetition of the third nominal repetition may be transmitted in OFDM symbol 14 of slot 1, and the second actual repetition may be transmitted in OFDM symbols 1 to 5 of slot 2. In this case, the OFDM symbol length of the first actual repetition to which the first transmission beam is applied and the second actual repetition to which the second transmission beam is applied may be different. To equalize this, one OFDM symbol may be added for the transient period between the second and third nominal repetitions. In this case, the third nominal repetition may be transmitted in OFDM symbols 1 to 6 of slot 2 by mapping the second transmission beam, and the aperiodic CSI report may be multiplexed and transmitted at the first actual repetition of each transmission beam. According to one disclosure, if the OFDM symbol length of the first PUSCH repetition to which the second transmission beam is applied is different from the first PUSCH repetition, the aperiodic CSI report may be multiplexed to only one of the two PUSCH repetitions. In this case, one PUSCH to be multiplexed may be defined in advance. That is, the aperiodic CSI report may be multiplexed to the first PUSCH repetition or the second PUSCH repetition. Alternatively, aperiodic CSI reporting may be multiplexed to a long or short PUSCH repetition of two PUSCH repetitions. Alternatively, aperiodic CSI reporting may be multiplexed to PUSCH repetition with a large or small amount of resources among two PUSCH repetitions.

[Method 1-2-3] Following Method 1-2, the UE determines the aperiodic CSI report in which the OFDM symbol length of the first PUSCH repetition to which the second transmission beam is applied is determined in Method 1-2 is the first PUSCH repetition to be multiplexed. If it does not have the same length, it is possible to compare the resource amount of two PUSCH repetitions, determine the rate matching method according to the side having a small amount of resource allocation, and multiplex the aperiodic CSI report to the two PUSCH repetitions.

,

를 각각 계산하여 적은 값의

,

를 사용하여 두 PUSCH repetition에 비주기적 CSI 보고를 multiplexing 할 수 있다. According to one disclosure, the first and second PUSCH repetitions using the [Table 40]

,

By calculating each, the small value of

,

can be used to multiplex aperiodic CSI reporting for two PUSCH repetitions.

,

,

,

의 값 중 적어도 하나를 두 PUSCH repetition 의 multiplexing 동작에 동일하게 적용할 수 있다. 다시 말해 두 PUSCH repetition 각각에 대응되는

,

,

,

중 적은 값의

,

,

,

를 두 PUSCH repetition 의 rate matching 을 위한

,

의 계산에 사용할 수 있다.According to another disclosure, used in the formula of [Table 40]

,

,

,

At least one of the values of may be equally applied to the multiplexing operation of two PUSCH repetitions. In other words, corresponding to each of the two PUSCH repetitions

,

,

,

of the lesser value

,

,

,

For rate matching of two PUSCH repetitions

,

can be used for the calculation of

,

의 두 값 중 하나만을 계산하여 비주기적 CSI 보고가 multiplexing 될 수 있다.in the above disclosures

,

Aperiodic CSI reporting can be multiplexed by calculating only one of the two values of .

[Method 1-2-4] Following Method 1-2, the UE has the same length as the first PUSCH repetition to which the aperiodic CSI report determined in Method 1-2 is to be multiplexed among PUSCH repetitions to which the second transmission beam is applied. The X-th PUSCH repetition with can be determined as PUSCH repetition for multiplexing aperiodic CSI reporting. At this time, if there are several PUSCH repetitions having the same length, the first of them, that is, the smallest number of X-th PUSCH repetitions can be determined as PUSCH repetitions for multiplexing aperiodic CSI reporting. If there is no such case (that is, if there is no PUSCH repetition having the same length as the first PUSCH repetition among the PUSCH repetitions to which the second transmission beam is applied), the UE uses the above methods 1-1 and 1-2-1 , 1-2-2, or 1-2-3 in consideration of one of the aperiodic CSI reporting can be determined to determine the second PUSCH repetition to be multiplexed.

[Method 1-3] According to one disclosure, in determining the PUSCH repetition for which the aperiodic CSI report is to be multiplexed, the UE may determine the X-th PUSCH repetition having the same OFDM symbol length for each transmission beam. For example, if there are 4 PUSCH repetitions per transmission beam for each of the two transmission beams, and the second PUSCH repetitions to which the first and second transmission beams are applied have the same OFDM symbol length, the UE performs the corresponding PUSCH repetitions It is possible to multiplex the aperiodic CSI report. At this time, if there are several pairs of PUSCH repetitions having the same length, it can be determined as the PUSCH repetition for multiplexing the aperiodic CSI report to the first, that is, the smallest number of X-th PUSCH repetition pairs. If the corresponding case does not exist, that is, if the OFDM symbol lengths are all different between PUSCH repetitions of the same order within two transmission beams, the UE uses the methods 1-1, 1-2-1, and 1-2-2 Alternatively, two PUSCH repetitions for multiplexing aperiodic CSI reporting may be determined in consideration of one of 1-2-3.

For the above methods 1-1 to 1-3, only two transmission beams were considered for convenience of description, but this is a method that considers N (>2) or more transmission beams, that is, N (>2) or more TRPs. It can be considered by generalizing to repeated transmission. In addition, with respect to the methods 1-1 to 1-3, in determining the PUSCH repetition for the UE to multiplex the aperiodic CSI report, for convenience of explanation, only the same number of OFDM symbols was considered and described, but this is the PUSCH repetition Since the description is made assuming the same frequency resource allocation, the above methods 1-1 to 1-3 can be considered by generalizing not only the same number of OFDM symbols but also whether the resource allocation values are the same. That is, it can be generalized to whether the number of REs determined by considering both time and frequency resource allocation is the same.

21 is a diagram illustrating an operation of a terminal in consideration of Embodiment 3 of the present disclosure. In FIG. 21, the terminal may report terminal capability information to the base station (2101). At this time, information that can be transmitted includes aperiodic CSI reporting related information, PUSCH repetition type A or B related information, whether multiple TRP-based PUSCH repetition is supported, and transient offset related information when changing the transmission beam described above in the second embodiment. can Thereafter, the terminal may receive higher layer signaling configuration information from the base station (2102). At this time, the information that can be received includes aperiodic CSI reporting related information, PUSCH repeated transmission scheme A or B related information, and multiple TRP-based PUSCH repetition related information (repeated transmission method, number of repeated transmissions, transmission beam mapping unit or method, a plurality of Whether SRI or TPMI field support is possible, SRS resource set for a plurality of codebooks/non-codebooks, etc.) may be included. Thereafter, the UE may receive a DCI for scheduling repeated PUSCH transmission including an aperiodic CSI report and a transport block (2103), and in determining repeated PUSCH transmission for multiplexing the aperiodic CSI report, the methods 1-1 to Repeated PUSCH transmission may be performed in consideration of one of 1-3 (2104). If the UE considers methods 1-2-4 and 1-3, if a fallback operation is required as described above (eg, when considering methods 1-2-4, PUSCH to which the second transmission beam is applied) Among repetitions, if PUSCH repetition having the same length as the first PUSCH repetition does not exist), the UE may perform repeated PUSCH transmission in consideration of one of methods 1-1, 1-2-1 to 1-2-3. may (2105).

22 is a diagram illustrating an operation of a base station in consideration of Embodiment 3 of the present disclosure. In FIG. 22, the base station may receive a terminal capability report from the terminal (2201). Information that can be received at this time includes aperiodic CSI report related information, PUSCH repetition transmission scheme A or B related information, multi-TRP-based PUSCH repetition related information, and transient offset related information when changing the transmission beam described above in the second embodiment. may be included. Thereafter, the base station may transmit higher layer signaling configuration information to the terminal ( 2202 ). At this time, the information that can be transmitted includes aperiodic CSI reporting related information, PUSCH repeated transmission scheme A or B related information, multi-TRP-based PUSCH repetition related information (repeated transmission method, number of repeated transmissions, transmission beam mapping unit or method, a plurality of Whether SRI or TPMI field support is possible, SRS resource set for a plurality of codebooks/non-codebooks, etc.) may be included. Thereafter, the base station may transmit DCI for scheduling repeated PUSCH transmission including the aperiodic CSI report and the transport block (2203), and when the UE determines the repeated PUSCH transmission for multiplexing the aperiodic CSI report, the method 1-1 to 1-3, it is assumed that one of the repeated PUSCH transmissions may be received (2204). If the UE considers methods 1-2-4 and 1-3, if a fallback operation is required as described above (eg, when considering methods 1-2-4, PUSCH to which the second transmission beam is applied) If PUSCH repetition having the same length as the first PUSCH repetition does not exist among repetitions), the base station repeats the PUSCH assuming that the terminal considers one of methods 1-1, 1-2-1 to 1-2-3 The transmission may be received ( 2205 ).

<Embodiment 3-1: Aperiodic CSI reporting multiplexing method according to higher layer signaling during PUSCH transmission considering multiple TRP>

As an embodiment of the present invention, when the UE is configured with a multi-TRP-based PUSCH repetition transmission scheme A or B and receives a transport block transmission schedule, various methods for multiplexing aperiodic CSI reporting to specific PUSCH repetition(s) are considered. can PUSCH repetition considered below may be nominal repetition or actual repetition. In addition, when the UE determines the PUSCH repetition for multiplexing the aperiodic CSI report, if the corresponding PUSCH repetition has a length of one OFDM symbol, it may be excluded. The UE may report whether to support the function of multiplexing aperiodic CSI reporting to a plurality of PUSCH repetitions as UE capability.

[Method 1-4] According to one disclosure, the UE may multiplex the aperiodic CSI report to two PUSCH repetitions among the entire PUSCH repetitions. At this time, the UE may determine that the first PUSCH repetition among the two PUSCH repetitions for multiplexing the aperiodic CSI report is the first PUSCH repetition to which the first transmission beam is applied. In addition, when the terminal determines the X-th PUSCH repetition to which the second transmission beam can be applied, the base station may set Y, which is the number of candidates of X, as higher layer signaling. In the case of PUSCH repetition type A, if the number of repetitions indicated by DCI to the terminal is N, Y may be a natural number greater than or equal to 1 and less than or equal to N. In the case of PUSCH repetition type B, if the number of nominal repetitions indicated to the terminal by DCI is N and the number of actual repetitions is M, Y may be a natural number greater than or equal to 1 and less than or equal to M. In addition, the UE may determine the second PUSCH repetition among the two PUSCH repetitions for multiplexing the aperiodic CSI report using the Y value set for higher layer signaling through the following detailed methods. According to one disclosure, aperiodic CSI reporting of the same information may be multiplexed for each PUSCH repetition. In other words, CSI part 1 or CSI part 2 information of the same information may be multiplexed.

[Method 1-4-1] Following Method 1-4, the UE may determine the second PUSCH repetition as the first PUSCH repetition to which the second transmission beam is applied. At this time, the UE may multiplex the aperiodic CSI report to the two PUSCH repetitions regardless of whether the two determined PUSCH repetitions have the same or different OFDM symbol lengths. In this case, if the two PUSCH repetitions have different OFDM symbol lengths, soft combining is impossible in the base station, and only selection diversity can be obtained by decoding the two PUSCH repetitions, respectively.

[Method 1-4-2] Following Method 1-4, the UE determines the OFDM symbol length of the first PUSCH repetition to which the second transmission beam is applied in Method 1-4 The first PUSCH to which the aperiodic CSI report is to be multiplexed You can limit it to have the same length as repetition. As an example, the UE may adjust the transient period so that two PUSCH repetitions determined for multiplexing the aperiodic CSI report have the same length when changing a beam between two transmission beams. That is, by increasing the length of the transient period that exists between nominal repetitions in which the transmission beam is changed, the OFDM symbol length between the first actual repetitions of each transmission beam can be made equal. For example, if there is no OFDM symbol position set to the invalid symbol, the transmission beam mapping method of multiple TRP-based PUSCH repetition is sequential, the OFDM symbol length for the nominal repetition of the PUSCH repetition transmission method B is 6, and the number of repeated transmissions is 4, the first nominal repetition can be transmitted in OFDM symbols 1 to 6 of slot 1 by mapping the first transmission beam, and the second nominal repetition is by mapping the first transmission beam to OFDM symbols 7 to 12 of slot 1 can be transmitted from Since the third nominal repetition is the first nominal repetition that is changed and mapped from the first transmission beam to the second transmission beam, a transient period may exist between the second and third nominal repetitions. If the length of the transient period requires one OFDM symbol length, the third nominal repetition can be transmitted in OFDM symbol 14 of slot 1 to OFDM symbol 5 of slot 2, and can be divided into two actual repetitions at the slot boundary. can The first actual repetition of the third nominal repetition may be transmitted in OFDM symbol 14 of slot 1, and the second actual repetition may be transmitted in OFDM symbols 1 to 5 of slot 2. In this case, the OFDM symbol length of the first actual repetition to which the first transmission beam is applied and the second actual repetition to which the second transmission beam is applied may be different. To equalize this, one OFDM symbol may be added for the transient period between the second and third nominal repetitions. In this case, the third nominal repetition may be transmitted in OFDM symbols 1 to 6 of slot 2 by mapping the second transmission beam, and the aperiodic CSI report may be multiplexed and transmitted at the first actual repetition of each transmission beam. According to one disclosure, if the OFDM symbol length of the first PUSCH repetition to which the second transmission beam is applied is different from the first PUSCH repetition, the aperiodic CSI report may be multiplexed to only one of the two PUSCH repetitions. In this case, one PUSCH to be multiplexed may be defined in advance. That is, the aperiodic CSI report may be multiplexed to the first PUSCH repetition or the second PUSCH repetition. Alternatively, aperiodic CSI reporting may be multiplexed to a long or short PUSCH repetition of two PUSCH repetitions. Alternatively, aperiodic CSI reporting may be multiplexed to PUSCH repetition with a large or small amount of resources among two PUSCH repetitions.

[Method 1-4-3] Following Method 1-4, the UE determines the OFDM symbol length of the first PUSCH repetition to which the second transmission beam is applied is the first PUSCH repetition to be multiplexed with the aperiodic CSI report determined in Method 1-4 If it does not have the same length, it is possible to compare the resource amount of two PUSCH repetitions, determine the rate matching method according to the side having a small amount of resource allocation, and multiplex the aperiodic CSI report to the two PUSCH repetitions.

,

를 각각 계산하여 적은 값의

,

를 사용하여 두 PUSCH repetition에 비주기적 CSI 보고를 multiplexing 할 수 있다. According to one disclosure, the first and second PUSCH repetitions using the [Table 40]

,

By calculating each, the small value of

,

can be used to multiplex aperiodic CSI reporting for two PUSCH repetitions.

,

,

,

의 값 중 적어도 하나를 두 PUSCH repetition 의 multiplexing 동작에 동일하게 적용할 수 있다. 다시 말해 두 PUSCH repetition 각각에 대응되는

,

,

,

중 적은 값의

,

,

,

를 두 PUSCH repetition 의 rate matching 을 위한

,

의 계산에 사용할 수 있다.According to another disclosure, used in the formula of [Table 40]

,

,

,

At least one of the values of may be equally applied to the multiplexing operation of two PUSCH repetitions. In other words, corresponding to each of the two PUSCH repetitions

,

,

,

the lesser of

,

,

,

For rate matching of two PUSCH repetitions

,

can be used for the calculation of

,

의 두 값 중 하나만을 계산하여 비주기적 CSI 보고가 multiplexing 될 수 있다.in the above disclosures

,

Aperiodic CSI reporting can be multiplexed by calculating only one of the two values of .

[Method 1-4-4] Following Method 1-4, the UE has the same length as the first PUSCH repetition in which the aperiodic CSI report determined in Method 1-4 is to be multiplexed among PUSCH repetitions to which the second transmission beam is applied. The X-th PUSCH repetition with can be determined as PUSCH repetition for multiplexing aperiodic CSI reporting. Here, when determining the X-th PUSCH repetition, the number of PUSCH repetitions to which the second transmission beam for comparing whether or not it has the same OFDM symbol length as the first PUSCH repetition may be limited to a Y value set by higher layer signaling. At this time, if there are several PUSCH repetitions having the same length, the first of them, that is, the smallest number of X-th PUSCH repetitions can be determined as PUSCH repetitions for multiplexing aperiodic CSI reporting. If there is no such case (that is, if PUSCH repetition having the same length as the first PUSCH repetition among PUSCH repetitions to which the second transmission beam is applied does not exist), the terminal may use the above methods 1-4, 1-4-1 , 1-4-2, or 1-4-3 may be taken into consideration to determine the second PUSCH repetition in which the aperiodic CSI report is multiplexed.

[Method 1-5] According to one disclosure, in determining the PUSCH repetition by which the aperiodic CSI report is to be multiplexed, the UE may determine the X-th PUSCH repetition having the same OFDM symbol length for each transmission beam. Here, when determining the X-th PUSCH repetition, the number of pairs of PUSCH repetitions for comparing whether each transmission beam has the same OFDM symbol length may be limited to a Y value set by higher layer signaling. For example, if there are 4 PUSCH repetitions per transmission beam for each of the two transmission beams, Y is set to 2, and the second PUSCH repetitions to which the first and second transmission beams are applied have the same OFDM symbol length , the UE may multiplex the aperiodic CSI report for the corresponding PUSCH repetitions. At this time, if there are several pairs of PUSCH repetitions having the same length, it can be determined as the PUSCH repetition for multiplexing the aperiodic CSI report to the first, that is, the smallest number of X-th PUSCH repetition pairs. If the corresponding case does not exist, that is, if the OFDM symbol lengths are all different between PUSCH repetitions in the same order within two transmission beams, the UE uses the methods 1-4, 1-4-1, 1-4-2 Alternatively, two PUSCH repetitions for multiplexing aperiodic CSI reporting may be determined in consideration of one of 1-4-3.

Methods 1-4, 1-4-1, 1-4-2, 1-4-3, or 1-5 have been described in consideration of only two transmission beams for convenience of explanation, but this is 2) more than one transmission beam, that is, N (>2) or more TRP can be considered as generalized to repeated transmission. In addition, for the methods 1-4, 1-4-1, 1-4-2, 1-4-3, or 1-5, the UE describes in determining the PUSCH repetition for multiplexing aperiodic CSI reporting For the convenience of , only the same number of OFDM symbols has been described for the description, but since this is described assuming the same frequency resource allocation between PUSCH repetitions, the above methods 1-4, 1-4-1, 1-4-2, 1 -4-3 or 1-5 can be considered by generalizing not only the same number of OFDM symbols but also the existence of the same resource allocation value. That is, it can be generalized to whether the number of REs determined by considering both time and frequency resource allocation is the same.

<Fourth embodiment: Aperiodic/semi-permanent CSI report transmission method in case of repeated PUSCH transmission considering multiple TRP>

As an embodiment of the present invention, the UE receives a multi-TRP-based PUSCH repeated transmission scheme B configured, receives a schedule for an aperiodic CSI report or receives a DCI for activating semi-permanent CSI reporting, and the DCI does not schedule transport block transmission. In this case, various PUSCH repetition transmission schemes may be considered. In addition, when the UE determines the PUSCH repetition for multiplexing the aperiodic or semi-permanent CSI report, if the corresponding PUSCH repetition has a length of one OFDM symbol, it may be excluded.

[Method 2-1] According to one disclosure, the UE may assume that the number of nominal repetitions is 1 regardless of the number of repeated transmissions of the configured PUSCH repeated transmission scheme B. In this case, the UE may transmit by applying the first transmission beam among the two different transmission beams received through the multi-TRP-based PUSCH repeated transmission configuration. In this case, it can be assumed that the OFDM symbol lengths of the first nominal repetition and the first actual repetition are the same. If the OFDM symbol length of the first nominal repetition and the first actual repetition is not the same, the first nominal repetition transmission may be ignored.

[Method 2-1-1] Following Method 2-1, the UE may consider transmission for only one nominal repetition regardless of the set number of repeated PUSCH transmissions, and is generated by the number of repeated transmissions of the configured PUSCH repeated transmission scheme B Among a plurality of nominal repetitions and actual repetitions, one PUSCH having the same nominal repetition and actual repetition is transmitted, and other repeated PUSCH transmissions may be ignored. At this time, if there are a plurality of PUSCH transmissions having the same nominal repetition and actual repetition, the first PUSCH transmission is performed, and the remaining repeated PUSCH transmissions may be ignored. On the other hand, when the OFDM symbol lengths of all nominal repetitions and actual repetitions are different, the repeated PUSCH transmission may be ignored.

[Method 2-2] According to one disclosure, the terminal may assume that the number of nominal repetitions is 1 and the number of actual repetitions is 2, regardless of the set number of repeated transmissions of PUSCH repetition type B. In this case, each actual repetition may have half the number of OFDM symbols of nominal repetition. If the OFDM symbol length of the set nominal repetition is odd, the terminal may use a value obtained by dividing the OFDM symbol length of the nominal repetition by 2 when determining the OFDM symbol length of the actual repetition. At this time, the terminal can map the first transmission beam to the first actual repetition and the second transmission beam to the second actual repetition regardless of whether the transmission beam mapping method is set to a sequential or cyclic method during multiple TRP-based PUSCH repetition. have. That is, the UE may apply the cyclic method as the transmit beam mapping method regardless of whether the transmit beam mapping method is set to the sequential or cyclic method. If the OFDM symbol lengths of the first actual repetition and the second actual repetition are not the same, both actual repetitions may be ignored, or transmission of one of the (first or second) actual repetitions may be ignored (omit).

[Method 2-3] According to one disclosure, the UE may assume that the number of nominal repetitions is 2 regardless of the number of repeated transmissions of the set PUSCH repetition type B. At this time, the UE can map the first transmit beam to the first PUSCH repetition and the second transmit beam to the second PUSCH repetition regardless of whether the transmit beam mapping method is set to sequential or cyclic during multi-TRP PUSCH repetition. have. That is, the UE may apply the cyclic method as the transmit beam mapping method regardless of whether the transmit beam mapping method is set to the sequential or cyclic method. If the OFDM symbol length of the first nominal repetition and the first actual repetition is not the same, the first nominal repetition transmission may be ignored. As such, when the first transmission is ignored, the second transmission beam may still be mapped to the transmission beam for the second transmission. In addition, when the OFDM symbol length of the second nominal repetition and the second actual repetition are not the same, the second nominal repetition transmission may be ignored (omit). As another example, if the OFDM symbol lengths of the first nominal repetition and the first actual repetition are not the same, both the first and second nominal repetition transmissions may be ignored.

[Method 2-3-1] Following Method 2-3, the UE may consider only transmission for two nominal repetitions regardless of the set number of repeated PUSCH transmissions, and a plurality of nominal repetitions generated by the configured number of repeated PUSCH transmissions. Among repetition and actual repetition, one PUSCH transmission having the same nominal repetition and actual repetition is transmitted for each transmission beam, and other repeated PUSCH transmissions may be ignored. That is, all nominal repetitions and actual repetitions for the first transmission beam are compared, and the first PUSCH among the PUSCHs having the same OFDM symbol length of nominal repetition and actual repetition is transmitted, and all nominal repetitions and actual repetitions for the second transmission beam are transmitted. By comparing , it is possible to consider transmission for a total of two nominal repetitions by transmitting the first PUSCH among the PUSCHs having the same OFDM symbol length of nominal repetition and actual repetition. At this time, if there is no case where the OFDM symbol length of nominal repetition and actual repetition is the same for each transmission beam, the corresponding transmission may be ignored.

For the above methods 2-1 to 2-3-1, only two transmission beams were considered for convenience of description, but this is N (>2) or more transmission beams, that is, N (>2) or more TRPs. It can be generalized and considered even with repeated transmission to be considered.

23 is a diagram illustrating an operation of a terminal in consideration of the fourth embodiment. In FIG. 23, the terminal may report the terminal capability to the base station (2301). At this time, information that can be transmitted includes aperiodic CSI report related information, PUSCH repetition transmission scheme A or B related information, multi-TRP based PUSCH repetition related information, and transient offset related information when changing the transmission beam described above in the second embodiment. may be included. Thereafter, the terminal may receive higher layer signaling configuration information from the base station (2302). In this case, the information that can be received includes aperiodic/semi-permanent CSI report related information, PUSCH repeated transmission scheme A or B related information, and multiple TRP-based PUSCH repeated transmission related information (repeated transmission method, number of repeated transmissions, transmission beam mapping unit or method). , whether a plurality of SRI or TPMI fields can be supported, an SRS resource set for a plurality of codebooks/non-codebooks, etc.) and information related to a transient offset when changing the transmission beam described above in the second embodiment may be included. Thereafter, the UE schedules the aperiodic CSI report, activates the semi-permanent CSI report, and may receive a DCI for scheduling repeated PUSCH transmission without transport block scheduling (2303), and the PUSCH to transmit the aperiodic or semi-permanent CSI report. In determining repeated transmission, repeated PUSCH transmission may be performed in consideration of one of the methods 2-1 to 2-3 above (2304).

24 is a diagram illustrating an operation of a base station in consideration of the fourth embodiment. 24, the base station may receive a terminal capability report from the terminal (2401). The information that can be received at this time includes aperiodic CSI report related information, PUSCH repetitive transmission scheme A or B related information, multiple TRP-based PUSCH repetitive transmission related information, and transient offset related information when changing the transmission beam described above in the second embodiment. may be included. Thereafter, the base station may transmit higher layer signaling configuration information to the terminal (2402). At this time, the information that can be transmitted includes aperiodic CSI reporting related information, PUSCH repeated transmission scheme A or B related information, multi-TRP-based PUSCH repetition related information (repeated transmission method, number of repeated transmissions, transmission beam mapping unit or method, a plurality of Whether SRI or TPMI field support is possible, SRS resource set for a plurality of codebooks/non-codebooks, etc.) and information related to a transient offset when the transmission beam is changed in the second embodiment may be included. Thereafter, the base station may schedule the aperiodic CSI report, activate the semi-permanent CSI report, and transmit a DCI that schedules repeated PUSCH transmission without transport block scheduling (2403), and the PUSCH repetition to transmit the aperiodic or semi-permanent CSI report It is assumed that one of Methods 2-1 to 2-3 is considered when the UE determines transmission, and repeated PUSCH transmission may be received ( 2404 ).

25 is a diagram illustrating a structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 25 , the terminal may include a transceiver, a memory (not shown), and a terminal processing unit 2505 (or a terminal control unit or a processor) that refer to a terminal receiving unit 2500 and a terminal transmitting unit 2510 . According to the communication method of the terminal described above, the transmitting and receiving units 2500 and 2510, the memory and the terminal processing unit 2505 of the terminal may operate. However, the components of the terminal are not limited to the above-described example. For example, the terminal may include more or fewer components than the aforementioned components. In addition, the transceiver, the memory, and the processor may be implemented in the form of one chip.

The transceiver may transmit/receive a signal to/from the base station. Here, the signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. However, this is only an embodiment of the transceiver, and components of the transceiver are not limited to the RF transmitter and the RF receiver.

In addition, the transceiver may receive a signal through a wireless channel, output it to the processor, and transmit a signal output from the processor through the wireless channel.

The memory may store programs and data necessary for the operation of the terminal. In addition, the memory may store control information or data included in a signal transmitted and received by the terminal. The memory may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, there may be a plurality of memories.

In addition, the processor may control a series of processes so that the terminal can operate according to the above-described embodiment. For example, the processor may receive the DCI composed of two layers and control the components of the terminal to receive a plurality of PDSCHs at the same time. The number of processors may be plural, and the processor may perform a component control operation of the terminal by executing a program stored in the memory.

26 is a diagram illustrating a structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 26 , the base station may include a transceiver, a memory (not shown), and a base station processing unit 2605 (or a base station controller or processor) that refer to a base station receiving unit 2600 and a base station transmitting unit 2610 . According to the communication method of the base station described above, the transceiver units 2600 and 2610, the memory and the base station processing unit 2605 of the base station may operate. However, the components of the base station are not limited to the above-described example. For example, the base station may include more or fewer components than the above-described components. In addition, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

The transceiver may transmit/receive a signal to/from the terminal. Here, the signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. However, this is only an embodiment of the transceiver, and components of the transceiver are not limited to the RF transmitter and the RF receiver.

In addition, the transceiver may receive a signal through a wireless channel and output it to the processor, and transmit the signal output from the processor through the wireless channel.

The memory may store programs and data necessary for the operation of the base station. In addition, the memory may store control information or data included in a signal transmitted and received by the base station. The memory may be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Also, there may be a plurality of memories.

The processor may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, the processor may control each component of the base station to configure two-layer DCIs including allocation information for a plurality of PDSCHs and transmit them. There may be a plurality of processors, and the processor may execute a program stored in the memory to perform an operation of controlling the components of the base station.

Methods according to the embodiments described in the claims or specifications of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.

Such programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or any other form of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.

In addition, the program accesses through a communication network consisting of a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the invention are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is appropriately selected for the context presented for convenience of description, and the present disclosure is not limited to the singular or plural element, and even if the element is expressed in plural, it is composed of a singular or singular. Even an expressed component may be composed of a plurality of components.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is apparent to those of ordinary skill in the art to which other modifications are possible based on the technical spirit of the present disclosure. In addition, each of the above embodiments may be operated in combination with each other as needed. For example, the base station and the terminal may be operated by combining parts of one embodiment and another embodiment of the present disclosure. For example, a base station and a terminal may be operated by combining parts of the first and second embodiments of the present disclosure. In addition, although the above embodiments have been presented based on the FDD LTE system, other modifications based on the technical idea of the embodiment may be implemented in other systems such as the TDD LTE system, 5G or NR system.

On the other hand, in the drawings for explaining the method of the present invention, the order of description does not necessarily correspond to the order of execution, and the precedence relationship may be changed or may be executed in parallel.

Alternatively, some components may be omitted and only some components may be included in the drawings for explaining the method of the present invention without impairing the essence of the present invention.

In addition, the method of the present invention may be implemented in a combination of some or all of the contents included in each embodiment within a range that does not impair the essence of the invention.

Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and embodiments of the present disclosure are not limited to the disclosed embodiments. Those of ordinary skill in the art to which the present disclosure pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present disclosure. The scope of the present disclosure is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present disclosure. do.

Claims (1)

A control signal processing method in a wireless communication system, comprising:
Receiving a first control signal transmitted from the base station;
processing the received first control signal; and
and transmitting a second control signal generated based on the processing to the base station.

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