KR20220053457A - Method and apparatus for 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 higher data transmission rates 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 various embodiments of the present invention, provided are a method for repeatedly transmitting and receiving uplink data in a network cooperative communication system and a device capable of performing the same.

Description

Method and apparatus for repeating uplink data transmission/reception for network cooperative communication

The present disclosure relates to a method and apparatus for repeatedly transmitting and receiving uplink data in a network cooperative communication system.

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 (80 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-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, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technologies such as Filter Bank Multi Carrier (FBMC), 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 the 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.

An object of the present disclosure is to provide an apparatus and method for effectively providing a service in a mobile communication system through various embodiments of the present disclosure.

The present disclosure for solving the above problems provides 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.

According to various embodiments of the present disclosure, a method for repeatedly transmitting and receiving uplink data in a network cooperative communication system and an apparatus capable of performing the same are provided. In this way, a more improved performance gain can be obtained.

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 (physical downlink control channel) 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 discontinuous reception (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 a transmission configuration indication (TCI) state setting 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 medium access control (MAC) control element (CE) signaling structure for a PDCCH demodulation reference signal (DMRS) in a wireless communication system according to an embodiment of the present disclosure.
10 is a diagram illustrating an example of CORESET and search space beam setting in a wireless communication system according to an embodiment of the present disclosure.
11 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.
12 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.
13A 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.
13B illustrates an example of repeated PUSCH transmission type B in a wireless communication system according to an embodiment of the present disclosure.
14 is a diagram illustrating a radio protocol structure of a base station and a terminal in a single cell, carrier aggregation (CA), and dual connectivity (DC) situation in a wireless communication system according to an embodiment of the present disclosure.
15 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.
16 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.
17 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.
18 illustrates operations of a base station and a terminal for repeated PUSCH transmission in consideration of multiple TRP based on single DCI transmission using enhanced SRI and TPMI fields according to an embodiment of the present disclosure.
19 is a diagram for explaining a method of independently determining frequency hopping and transmission beam mapping during repeated PUSCH transmission in consideration of multiple TRP according to an embodiment of the present disclosure.
20 is a diagram for describing transmission beam mapping unit setting based on frequency hopping unit setting according to an embodiment of the present disclosure.
21 is a diagram illustrating an example of an uplink-downlink configuration (UL/DL configuration) in a wireless communication system according to an embodiment of the present disclosure.
22 is a diagram illustrating various transmission beam mapping methods according to slot formats for dynamic grant-based PUSCH repeated transmission according to an embodiment of the present disclosure.
23A is a diagram illustrating an operation of a terminal for transmission beam mapping in consideration of a slot format according to an embodiment of the present disclosure.
23B is a diagram illustrating an operation of a base station for transmission beam mapping in consideration of a slot format according to an embodiment of the present disclosure.
24 is a diagram illustrating a structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.
25 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 numerals.

Advantages and features of the present disclosure, and a method for 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 technical field 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 to be described later 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, as a subject performing resource allocation of the terminal, may be at least one of gNode B, eNode B, 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, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal, and an 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 5G below may be a concept including existing LTE, LTE-A and other similar services. there is. 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 that the instructions stored in the flow chart block(s) 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 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. '~' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Accordingly, as an example, '~' indicates 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 the LTE system, an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in a Downlink (DL), and Single Carrier Frequency Division Multiple (SC-FDMA) 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 to be 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 more improved data transfer rates than the data transfer rates supported by existing LTE, LTE-A or LTE-Pro. For example, in the 5G communication system, the eMBB must 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, mMTC requires large-scale terminal access support within a cell, improved terminal coverage, improved battery life, and reduced terminal cost. 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 that a cell cannot cover, 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 must be composed of 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 of 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 designed to allocate wide resources 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, in order to satisfy different requirements of each service, different transmission/reception techniques and transmission/reception parameters may be used between services. 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 wireless communication system according to an embodiment of the present disclosure.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(Resource Block, RB, 1-04)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, 1-01) as 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol (1-02) on the time axis and 1 subcarrier on the frequency axis (Subcarrier) ( 1-03) can be defined. in the frequency domain

(for example, 12) consecutive REs may constitute one resource block (Resource Block, RB, 1-04).

2 is a diagram illustrating a slot structure considered 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.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 interval. ) 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 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, radio resource control (RRC) 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 a master information block (MIB). More specifically, in the initial access stage, the PDCCH for receiving the system information (remaining system information, RMSI or system information block 1, which may correspond to SIB1) required for initial access through the MIB in the terminal may 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 by setting the bandwidth part. 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 and 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 a bandwidth of a different size 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 bandwidth portion of a relatively small bandwidth to the terminal, for example, a bandwidth portion of 20 MHz. In a situation where 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 step. 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) from the MIB of a physical broadcast channel (PBCH) can be transmitted (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 terminal may receive a physical downlink shared channel (PDSCH) through which the SIB is transmitted through the configured initial bandwidth portion. The initial bandwidth portion may be utilized for other system information (OSI), paging, and random access in addition to the purpose of receiving the SIB.

[SS/PBCH block]

Next, a synchronization signal (SS)/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 physical broadcast channel (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 stage and may decode the PBCH. The MIB may be obtained from the PBCH and a control region (Control Resource Set; 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 the demodulation reference signal (DMRS) transmitted in the control region #0 are quasi co location (QCL). The terminal may receive system information as downlink control information transmitted in control region #0. The terminal may acquire configuration information related to random access channel (RACH) necessary 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 related thereto.

[DRX]

6 is a diagram illustrating an example of a discontinuous reception (DRX) operation in a wireless communication system according to an embodiment of the present disclosure.

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 the terminal. When DRX is applied, the terminal turns on the receiver at a specific point in 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.

Here, drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, etc. are timers whose values are set by the base station, and the terminal is configured to monitor the PDCCH when a predetermined condition is satisfied. has the function to

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 the 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 UE 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]

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.

Scheduling information for uplink data (or physical uplink shared channel, PUSCH) or downlink data (or physical downlink shared channel, PDSCH) in the 5G system 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 a channel coding and modulation process. 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 is transmitted while being included in the CRC calculation process. 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 a slot format indicator (SFI) may be scrambled with an 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 3]

DCI format 0_1 may be used as 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 4]

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 5]

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 6]

[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 setting a control resource set (CORESET) through which a downlink control channel is transmitted in a wireless communication system according to an embodiment of the present disclosure. 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 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), 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 7]

In Table 7, tci-StatesPDCCH (hereinafter referred to as a 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. )/physical broadcast channel (PBCH) block (Block) index or CSI-RS (channel state information reference signal) index information.

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 a wireless communication system according to an embodiment of the present disclosure. 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 (Subcarrier). 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 include a plurality of REGs 503 . If the REG 503 shown in FIG. 5 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. 5 , 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 UE identity and various system parameters.

In 5G, a 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 DCI format and 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 8]

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): Purpose of indicating 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 above specified DCI formats may follow the definition below.

[Table 9]

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

[Equation 2]

- L: Aggregation level

: 캐리어(Carrier) 인덱스-

: Carrier index

- NCCE,p: the total number of CCEs in the control area p

,f: 슬롯 인덱스-

,f: slot index

- M(L)p,s,max: the number of PDCCH candidates of aggregation level L

- msnCI = 0, … , M(L)p,s,max -1: PDCCH candidate index of aggregation level L

- i = 0, … , L-1

-

- nRNTI: terminal identifier

,f) 값은 공통 탐색공간의 경우 0에 해당할 수 있다. Y_(p,

,f) may correspond to 0 in the case of a common search space.

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

,f) 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 the terminal-specific search space.

In 5G, as a plurality of search space sets may be set with different parameters (eg, parameters in Table 8), 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. All of the space set #2 can be monitored, and one of the search space set #1 and the search space set #2 can be monitored in a specific slot.

[PDCCH: span]

The UE may perform UE capability reporting for each subcarrier interval in 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 from the first symbol of two consecutive spans, and Y is the number of consecutive symbols that can monitor PDCCH within one span say In this case, 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, (5b-00), (5b-05), (5b -10) is expressed. As an example, (5b-00) represents a case in which two spans that can be expressed by (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 (5b-05), a case in which a total of three spans that can be expressed as (4,3) exist in the slot, and the interval between the second and third spans is X greater than X=4 '=5 symbols apart.

[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 10-1, 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 10-1 below, when one monitoring location (MO: monitoring occasion) for the type 1 and type 3 common search space or terminal-specific search space exists in the slot, the corresponding MO location is the slot It means the ability to monitor the MO when it is located within the first 3 symbols. 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 10-1]

- Terminal capability 2 (hereinafter referred to as FG 3-2). This terminal capability is as shown in Table 10-2 below, when a monitoring location (MO: monitoring occasion) for a common search space or a terminal-specific search space exists in one 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 10-2]

- Terminal capability 3 (hereinafter referred to as FG 3-5, 3-5a, 3-5b). As shown in Table 10-3 below, this terminal capability indicates a pattern of 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 can be 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 10-3]

The UE may report whether the above-described UE capability 2 and/or UE 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 UE 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 terminal receives the value of monitoringCapabilityConfig-r16, which is higher layer signaling, as r15monitoringcapability, the terminal 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 Here, the maximum value for the number of CCEs constituting the entire search space (meaning the entire CCE set 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 upper layer signaling, Mμ, the maximum number of PDCCH candidate groups that can be monitored by the UE, is defined on a slot basis in a cell set with a subcarrier interval of 15·2 μ kHz, according to Table 11-1 below, , when defined based on Span, it may follow Table 11-2 below.

[Table 11-1]

[Table 11-2]

[Condition 2: Limit the maximum number of CCEs]

As described above, according to the set value of higher layer signaling, Cμ, 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 a subcarrier In a cell set to an interval of 15·2 μ kHz, when defined based on a slot, Table 11-3 may be followed, and when defined based on a Span, Table 11-4 below may be followed.

[Table 11-3]

[Table 11-4]

For convenience of explanation, a situation that satisfies both conditions 1 and 2 at a specific time point is defined as “condition A”. Therefore, not satisfying condition A may mean not satisfying at least one of conditions 1 and 2 above.

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.

[PDCCH: Overbooking]

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

[Method 1]

If condition A for PDCCH is not satisfied at a specific time point (slot),

The terminal (or the base station) may preferentially select a search space set in which the search space type is set as a common search space from among search space sets existing at a corresponding time, over a search space set set as a terminal-specific search space.

When all search space sets set as the common search space are selected (that is, condition A is satisfied even after all search spaces set as the common search space are selected), 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 will be referred to) They may be associated with each other by setting a quasi co-location (QCL) as shown in [Table 12] below. The TCI state is for announcing the QCL relationship between the PDCCH (or PDCCH DMRS) and other RSs or channels, and a certain reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are QCL 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 12 below.

[Table 12]

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 13 below. Referring to Table 13, 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 12 above. do.

[Table 13]

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. 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 By setting it to , it can be notified 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 14-1 to 14-5 below show valid TCI state settings according to target antenna port types.

Table 14-1 shows the valid TCI state configuration when the target antenna port is CSI-RS for tracking (TRS). The TRS refers to 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 14-1, it can be used for aperiodic TRS.

[Table 14-1] Valid TCI state setting when the target antenna port is CSI-RS for tracking (TRS)

Table 14-2 shows the valid TCI state configuration when the target antenna port is CSI-RS for CSI. The CSI-RS for CSI means 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 14-2] Valid TCI state setting when the target antenna port is CSI-RS for CSI

Table 14-3 shows the effective 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 14-3] Valid TCI state setting when the target antenna port is CSI-RS for BM (for L1 RSRP reporting)

Table 14-4 shows the valid TCI state configuration when the target antenna port is a PDCCH DMRS.

[Table 14-4] Valid TCI state setting when target antenna port is PDCCH DMRS

Table 14-5 shows the valid TCI state configuration when the target antenna port is a PDSCH DMRS.

[Table 14-5] Valid TCI state setting when target antenna port is PDSCH DMRS

In the representative QCL setting method according to Tables 14-1 to 14-5, 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 14-6 below. In Table 14-6, the fourth row is a combination assumed by the UE before RRC configuration, and configuration after RRC is not possible.

[Table 14-6]

In NR, a hierarchical signaling method as shown in FIG. 8 is supported for dynamic allocation of a PDCCH beam.

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.

Referring to FIG. 8 , the base station may set N TCI states (805, 810, ..., 820) to the terminal through RRC signaling 800, and some of them may be set as TCI states 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 PDCCH DMRS in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 9, the TCI indication MAC CE signaling for the PDCCH DMRS consists of 2 bytes (16 bits), a reserved bit of 1 bit (910), a serving cell ID of 5 bits (915), and a BWP ID of 2 bits. 920, a 2-bit CORESET ID 925 and a 6-bit TCI state ID 930.

10 is a diagram illustrating an example of CORESET and search space beam setting in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 10 , the base station may indicate one of the TCI state lists included in the CORESET 1000 setting 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 disclosure provide a more flexible PDCCH beam configuration and operation method. Hereinafter, in describing an embodiment of the present disclosure, several distinct 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 sets 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.

With respect to 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 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.

[PDSCH: related to frequency resource allocation]

11 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.

11 is a diagram illustrating three frequency axis resource allocation methods: type 0 (11-00), type 1 (11-05), and dynamic switch (11-10) configurable through a higher layer in the NR wireless communication system It is a drawing showing the

Referring to FIG. 11 , if the UE is configured to use only resource type 0 through higher layer signaling (11-00), 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 resource block groups (RBGs) determined as shown in [Table 15-1] below according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size, and the bitmap Data is transmitted to the RBG indicated by 1.

[Table 15-1]

개의 비트들로 구성되는 주파수 축 자원 할당 정보를 포함한다. 이를 위한 조건은 차후 다시 설명된다. 기지국은 이를 통하여 starting VRB(11-20)와 이로부터 연속적으로 할당되는 주파수 축 자원의 길이(11-25)를 설정할 수 있다.If the UE is configured to use only resource type 1 through higher layer signaling (11-05), some DCI for allocating the 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 11-20 and the length 11-25 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 (11-10), some DCI for allocating PDSCH to the UE is payload for setting resource type 0 (11-15) and frequency axis resource allocation information composed of bits of a larger value (11-35) among payloads (11-20, 11-25) for setting resource type 1 and The 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, and when the corresponding bit is a value of '0', it is indicated that resource type 0 is used, and if the value is '1', the resource It may be indicated that type 1 is used.

[PDSCH/PUSCH: related to time resource allocation]

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 below.

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, higher layer signaling (e.g., For example, RRC signaling) can be set. For PDSCH, a table consisting of maxNrofDL-Allocations=16 entries may be configured, and for PUSCH, a table configured with maxNrofUL-Allocations=16 entries may be configured. In an 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 15-2] or [Table 15-3] below may be transmitted from the base station to the terminal.

[Table 15-2]

[Table 15-3]

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.

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

Referring to FIG. 12 , the base station sets subcarrier spacing (SCS) (μPDSCH, μPDCCH) of a data channel and a control channel configured by using a higher layer, a scheduling offset (scheduling offset) The time axis position of the PDSCH resource may be indicated according to the (K0) value and the OFDM symbol start position (12-00) and length (12-05) within one slot dynamically indicated through DCI.

13A 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. 13A, when the subcarrier intervals of the data channel and the control channel are the same (13a-00, μPDSCH = μPDCCH), since the slot numbers for data and control are the same, the base station and the terminal have a predetermined slot A scheduling offset may be generated according to the slot offset K0. On the other hand, when the subcarrier spacing of the data channel and the control channel are different (13a-05, μPDSCH ≠ μPDCCH), the slot numbers for data and control are different, so the base station and the terminal are based on the subcarrier spacing of the PDCCH Thus, a scheduling offset may be generated in accordance with a predetermined slot offset K0.

[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 usage 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: A setting for the usage of the SRS resource referenced in the SRS resource set, and 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 the SRS resource index 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 or between slots of the SRS resource. . In addition, the individual setting information for the SRS resource may include a 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, deactivates, or triggers SRS transmission to the terminal through higher layer signaling including RRC signaling or MAC CE signaling, or L1 signaling (eg, DCI). For example, 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 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. The UE may transmit the SRS resource in 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 within 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 can 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 the 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 within 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 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 defined as 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 aperiodic SRS transmission is mapped. can Minimum time interval may be determined with reference to PUSCH preparation procedure time required for UE to prepare PUSCH transmission. In addition, the minimum time interval may have a different value depending on the use 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 terminal 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 less than the minimum time interval, the DCI triggering the aperiodic SRS is ignored. can

[Table 16-1]

The spatialRelationInfo configuration information in [Table 16-1] 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 16-2] below.

[Table 16-2]

Referring to the spatialRelationInfo configuration, an SS/PBCH block index, CSI-RS index, or 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 configured grant Type 1 or Type 2. Dynamic scheduling indication for PUSCH transmission is possible in DCI format 0_0 or 0_1.

The Configured grant Type 1 PUSCH transmission does not receive the UL grant in DCI, and can be semi-statically configured through reception of configuredGrantConfig including the rrc-ConfiguredUplinkGrant of [Table 16-3] through higher signaling. Configured grant Type 2 PUSCH transmission can be semi-continuously scheduled by the UL grant in DCI after reception of configuredGrantConfig that does not include the rrc-ConfiguredUplinkGrant of [Table 16-3] through upper signaling. When PUSCH transmission is operated by a configured grant, parameters applied to PUSCH transmission are dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, scaling of UCI-OnPUSCH provided by pusch-Config of [Table 16-4], which is higher signaling, except is applied through configuredGrantConfig, which is the upper signaling of [Table 16-3]. If the terminal is provided with the transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 16-3], the terminal applies tp-pi2BPSK in the pusch-Config of [Table 16-4] for PUSCH transmission operated by the configured grant.

[Table 16-3]

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 16-4], which is higher level 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 16-4], the UE does not expect to be scheduled in DCI format 0_1.

[Table 16-4]

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 is equipped with 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 value of nrofSRS-Ports in SRS-Config, which is higher signaling. In the codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and the codebookSubset in the higher signaling, pusch-Config. The codebookSubset in the higher signaling pusch-Config 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, indicates two SRS antenna ports, the UE does not expect that the value of codebookSubset, which is higher 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 usage value is set to 'codebook' to the base station according to higher level signaling, 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. In this case, in codebook-based PUSCH transmission, the SRI is used as information for selecting an index of one SRS resource and is included in the DCI. Additionally, the base station includes information indicating the TPMI and rank to be used by the terminal 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. In this case, 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 level signaling. As with the above-described codebook-based PUSCH transmission, when the UE is provided with 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. 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 value of usage 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. In this case, 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 UE to transmit the PUSCH using DCI format 0_0 or DCI format 0_1, the UE determines the transmission method indicated through DCI (transmission precoding method of SRS resource, number of transmission layers, spatial domain transmission filter) A PUSCH preparation procedure time for transmitting a PUSCH by application may be required. In NR, the PUSCH preparation procedure time is defined in consideration of this. The PUSCH preparation procedure time of the UE may follow Equation 3 below.

[Equation 3]

에서 각 변수는 하기와 같은 의미를 가질 수 있다.the aforementioned

Each variable may have the following meaning.

- N2: 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 16-5], 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 16-5] 16-6].

[Table 16-5]

[Table 16-6]

- d2,1: 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, Tproc,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

Medium, Tproc,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.- Tc:

,

,

have

- d2,2: When the DCI scheduling PUSCH indicates BWP switching, the BWP switching time is followed, otherwise it has 0.

- d2: When OFDM symbols of a PUCCH and a PUSCH having a high priority index and a PUCCH having a low priority index overlap in time, the d2 value of the PUSCH having a high priority index is used. Otherwise, d2 is 0.

- Text: When the terminal uses the shared spectrum channel access method, the terminal may calculate the text and apply it to the PUSCH preparation procedure time. Otherwise, Text is assumed to be 0.

- Tswitch: When the uplink switching interval is triggered, Tswitch assumes the switching interval time. Otherwise, 0 is assumed.

The base station and the terminal consider the time axis resource mapping information of the PUSCH scheduled through DCI and the TA (timing advance) effect between uplink and downlink, from the last symbol of the PDCCH including the DCI scheduled for the PUSCH to Tproc,2 after If the first symbol of the PUSCH starts earlier than the first uplink symbol where the CP starts, it is determined that the PUSCH preparation procedure time is not sufficient. If not, the base station and the terminal determine that the PUSCH preparation procedure time is sufficient. The UE may transmit the PUSCH only when the PUSCH preparation procedure time is sufficient, and when the PUSCH preparation procedure time is not sufficient, the DCI for scheduling the PUSCH may be ignored.

Next, PUSCH repeated transmission will be described. When the UE is scheduled for PUSCH transmission in DCI format 0_1 in the PDCCH including the CRC scrambled to C-RNTI, MCS-C-RNTI or CS-RNTI, if the UE is configured with higher layer signaling pusch-AggregationFactor, pusch- The same symbol allocation is applied in consecutive slots equal to the AggregationFactor, and PUSCH transmission is limited to single rank transmission. For example, the UE should repeat the same TB in consecutive slots as many as pusch-AggregationFactor, and apply the same symbol allocation to each slot. [Table 16-7] shows the redundancy version applied to repeated PUSCH transmission for each slot. If the UE is scheduled for repeated PUSCH transmission in DCI format 0_1 in a plurality of slots, at least among the slots in which PUSCH repeated transmission is performed according to information of higher layer signaling tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated If one symbol is indicated as a downlink symbol, the UE does not perform PUSCH transmission in a slot in which the corresponding symbol is located.

[Table 16-7]

[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: repeated PUSCH transmission type A, and repeated PUSCH transmission type B. The UE may receive one of PUSCH repeated transmission type A or B configured by higher layer signaling.

PUSCH repeated transmission type A

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

- 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 the 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 For example, the terminal may be notified through DCI).

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 where 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 repeated transmission type B in one slot.

13B illustrates an example of repeated PUSCH transmission type B in a wireless communication system according to an embodiment of the present disclosure. The terminal may receive the start symbol S of the uplink data channel set to 0, the length L of the uplink data channel set to 14, and the number of repeated transmissions set to 16. In this case, Nominal repetition is indicated in 16 consecutive slots (301). Thereafter, the terminal may determine that the symbol set as the downlink symbol in each nominal repetition 301 is an invalid symbol. Also, the terminal determines the symbols set to 1 in the invalid symbol pattern 302 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 (303).

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. Also, in method 2, the time domain resource allocation information in DCI indicates the start point and repetition length of all repeated transmissions. In addition, in case of performing repeated transmission in a single slot through method 2, if multiple bundles of consecutive uplink symbols exist 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 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. 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 transmissions may be determined by referring to at least resource information of the first repeated transmission and the uplink or downlink directions of 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 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 through 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 resources of the frequency domain for each slot by a set frequency offset and transmits them. 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. RBstart(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.

[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 and report a corresponding UE capability information message 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 is needed.

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 the UE to configure UE capability in the NR system is summarized.

1. 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 configured BC candidate list. This operation may occur only when an LTE base station (eNB) requests “eutra” capability.

3. Thereafter, the terminal removes 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 UE selects BCs to be reported by selecting BCs suitable for the requested RAT type from the final “candidate BC list”. 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) has been removed. The "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 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 corresponding terminal based on the terminal capability received from the terminal.

[CA/DC Related]

14 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.

Referring to FIG. 14, 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).

With respect to the SDAP layer device, the UE can receive a configuration of whether to use the header of the SDAP layer device or the function of the SDAP layer device for each PDCP layer device, for each bearer, or for each logical channel with an RRC message, and the SDAP header When is set, the UE sends the 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

- Order 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 order based on a PDCP sequence number (SN), and a function of delivering data to the upper 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 (RLC re-establishment)

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. In-sequence delivery 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, and the received RLC PDUs are It may include a function of rearranging based on RLC sequence number (SN) or PDCP sequence number (SN), and may include a function of reordering the order to record lost RLC PDUs, and 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 in 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 it is received after being divided into SDUs, it may include a function of reassembling it and delivering it, and it 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 function (Mapping between logical channels and transport channels)

- Multiplexing/demultiplexing of MAC SDUs

- Scheduling information reporting function (Scheduling information reporting)

- 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

The NR PHY layer (S45, S50) channel-codes and modulates the upper layer data, creates an OFDM symbol and transmits it to the radio channel, or demodulates the OFDM symbol received through the radio channel, decodes the channel, and delivers 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) operation 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 like S20, but the PHY layer through the MAC layer A protocol structure for multiplexing is used.

[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 existing 5G wireless communication system, it can support not only a service requiring a high transmission speed, but also 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. For convenience in the following description of the present disclosure, a cell, transmission point, panel, beam or / And the transmission direction and the like are described as a TRP (transmission reception point, transmission point). Therefore, in actual application, it is possible to appropriately replace TRP with one of the above terms.

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 PDSCH JT.

15 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. 15 , 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. 15 , 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 terminal may receive one piece of DCI information for receiving one PDSCH demodulated based on DMRS transmitted through DMRS port A and DMRS B.

15 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 a different PDSCH layer to the UE, thereby improving throughput compared to single cell, TRP and/or beam transmission. In addition, each cell, TRP and/or beam repeatedly transmits the same PDSCH to the UE, thereby improving reliability compared to single cell, TRP, and/or beam transmission. For convenience of description, a cell, a TRP, and/or a beam is hereinafter collectively referred to as a TRP.

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.

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

Referring to FIG. 16, 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, and each of these DCIs is dependent on 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 that transmits control information on PDSCHs transmitted from cooperative TRPs, compared to normal DCI (nDCI) that transmits PDSCH-related control information transmitted from the serving TRP, the payload is small compared to 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 sDCI, but since the reception performance of sDCI is superior to that of nDCI, a difference in coverage for each DCI may occur. 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 PDSCH transmitted from the serving TRP (TRP#0), include all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, and cooperative TRP In the case of control information for 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 a 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 the 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 assignment may be low, such as the number of cooperative TRPs being 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 based on multiple PDCCHs. It is classified as NC-JT, and the aforementioned case #4 (N115) in which a single DCI (PDCCH) is used to support 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 a 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 aforementioned plurality of layers 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 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 simultaneously in one BWP" Indicator) indication based on the reception of the 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, but For convenience, one expression is used.

In the present disclosure, the radio protocol structure for NC-JT may be used in various ways according to TRP deployment scenarios. As an example, if 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. 14 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 such as CSI, scheduling, HARQ-ACK, etc. between cooperative TRPs requires 2 ms or more), it is 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, and 64, 128 in FR2. can be set, and among the set number, a maximum of 8 states that can be indicated by 3 bits of the TCI field of DCI through the MAC CE message can 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 indication or a beamforming change command for at least one PDSCH in one TRP.

[Example Introduction]

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.

Referring to the above-described PUSCH-related descriptions, the current Rel-15/16 NR is focused on a single cell or/and a single TRP or/and a single panel or/and a single beam or/and a single transmission direction for repeated PUSCH transmission. Specifically, in the case of repeated PUSCH transmission, transmission in a single TRP is considered regardless of codebook-based or non-codebook-based transmission. For example, in the codebook-based PUSCH transmission, the transmission beam of the terminal may be determined by the SRI and TPMI transmitted from the base station, that is, a single TRP to the terminal. Similarly, for non-codebook-based PUSCH transmission, a base station, that is, an NZP CSI-RS that can be configured from a single TRP may be configured to the terminal, and the transmission beam of the terminal may be determined by the SRI delivered from the single TRP. Therefore, if there is a degradation factor having a high temporal and spatial correlation, such as blockage, in a channel between the UE and a specific TRP, repeated PUSCH transmission to a single TRP is highly likely not to satisfy the expected performance. Therefore, in order to overcome such degradation, Rel-17 or later releases may support repeated PUSCH transmission considering a plurality of TRPs. This may be a method of maximizing a diversity gain in consideration of a channel between a plurality of TRPs and a terminal having different spatial characteristics. In order to support this, the UE must support configuration for repeated PUSCH transmission in multiple TRPs. For example, a plurality of transmission beams to be used during repeated PUSCH transmission in consideration of multiple TRPs, configuration or indication methods for power adjustment, etc. are required. In addition, higher layer signaling or dynamic indication is required to distinguish between the repeated transmission scheme considering a single TRP defined in Rel-15/16 and the repeated PUSCH transmission considering multiple TRPs to be newly defined in Rel-17. In addition, as a method for improving PUSCH reception performance, in order to maximize the diversity gain, the transmission beam and frequency hopping are linked so that the spatial diversity gain through repeated transmission to multiple TRP and frequency diversity through frequency hopping can be simultaneously obtained. You need a way to decide.

In the present disclosure, it is possible to minimize the loss of uplink data and the transmission delay time during repeated PUSCH transmission in consideration of multiple TRP by providing a processing method for the above-described requirements. With respect to the number of various cases, a method for setting or indicating repeated PUSCH transmission to multiple TRPs of the UE will be described in detail in the following embodiments.

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 to be described later 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 may be mentioned in various ways, such as omit or drop.

Hereinafter, in the present disclosure, the above examples will be 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 method of setting and indicating L1 signaling as higher layer signaling for repeated PUSCH transmission in consideration of multiple TRP. Repeated PUSCH transmission in consideration of multiple TRP may be operated through single or multiple DCI-based indications, which will be described in Examples 1-1 and 1-2, respectively.

In addition, the UE may support one of repeated PUSCH transmission through single or multiple DCI-based indications based on the configuration of the base station, or may use both methods by distinguishing them by L1 signaling while supporting both methods. The corresponding content will be described in the 1-3 embodiment.

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 single or multiple DCI-based 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 that a PUSCH repeated transmission method considering multiple TRPs based on a single DCI is possible through the UE capability report. For the UE reporting the UE capability (e.g., UE capability supporting repeated PUSCH transmission considering single DCI-based multiple TRP), the base station determines which PUSCH repetition transmission method to use through higher layer signaling. there is. 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. When transmitting a codebook-based PUSCH, the UE may use the SRI or TPMI indicated by one DCI to apply the same value to each repeated PUSCH transmission. In addition, the UE may use the SRI indicated by one DCI when transmitting the non-codebook-based PUSCH and apply the same value to each repeated PUSCH transmission. For example, if codebook-based PUSCH transmission and PUSCH repeated transmission scheme A are configured as upper 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 transmission beam, and TPMI may be related to a transmission 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.

In the case of instructing the UE to transmit a PUSCH repeated transmission method considering multiple TRPs based on a single DCI, methods for indicating a plurality of SRIs or TPMIs when the PUSCH transmission method is a codebook or a non-codebook may be considered as follows.

[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 DCI having a plurality of SRI or TPMI fields to the UE. The DCI is a new format (eg, DCI format 0_3) or an existing format (eg, DCI format 0_1, 0_2), but additional higher layer signaling (eg, multiple SRI or TPMI fields) possible signaling) is set. For example, when a codebook-based PUSCH transmission is configured with higher layer signaling, the UE receives a new format DCI (eg, DCI format 0_3) having two SRI fields and two TPMI fields to receive multiple TRPs. Considered PUSCH repeated transmission may be performed. For another example, in the case of non-codebook-based PUSCH transmission, the UE is set to support a plurality of SRI fields through higher layer signaling, and DCI of an existing format having two SRI fields (eg, DCI format 0_1, 0_2) can be received. In the case of indicating a plurality of SRS resources using a plurality of SRI fields, since the transmission power control parameter of the SRS resource is set for each SRS resource set, in order to set different transmission power control parameters for each TRP, each SRS resource is mutually It may exist in another 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.

17 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 UE performs a UE capability report on whether to support PUSCH repeated transmission considering single DCI-based multiple TRP (1751), and the base station that has received the corresponding UE capability report (1701) sets up PUSCH repeated transmission considering single DCI-based multiple TRP UE to (1702). In this case, the transmitted configuration information may include a repeated transmission method, the number of repeated transmissions, a transmission beam mapping unit or method, whether a plurality of SRI or TPMI fields can be supported, a plurality of codebooks or SRS resource sets for non-codebooks, and the like. Upon receiving the configuration, the terminal (1752) receives more than 2 repeated transmissions, if a plurality of SRI fields and TPMI fields exist in the DCI successfully received in case of codebook-based PUSCH transmission, or if non-codebook-based PUSCH transmission is received. If a plurality of SRI fields exist in the successful DCI ( 1755 ), a first PUSCH transmission operation is performed ( 1755 ), otherwise, a second PUSCH transmission operation is performed ( 1756 ). The first PUSCH transmission operation is an operation of repeatedly transmitting the PUSCH using a single SRI and TPMI field in the case of codebook-based PUSCH transmission and a single SRI field in the case of non-codebook-based PUSCH transmission, one transmission beam and/or one transmission PUSCH is repeatedly transmitted by applying a precoder. The second PUSCH transmission operation is an operation of repeatedly transmitting a PUSCH using a plurality of SRI and TPMI fields in the case of codebook-based PUSCH transmission and a plurality of SRI fields in the case of non-codebook-based PUSCH transmission, a plurality of transmission beams and/or a plurality of transmission beams. PUSCH is repeatedly transmitted by applying the transmission precoders. A method of mapping a plurality of transmit beams will be described in detail in the second embodiment.

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

In order to support the repeated PUSCH transmission method in consideration of multiple TRPs based on a single DCI, the UE may receive an improved 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. contains 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 to which a plurality of SRS spatial relation info is connected

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

In the case of 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.

18 illustrates operations of a base station and a terminal for repeated PUSCH transmission in consideration of multiple TRP based on single DCI transmission using enhanced SRI and TPMI fields according to an embodiment of the present disclosure. The terminal performs a terminal capability report on whether PUSCH repeated transmission is supported in consideration of single DCI-based multiple TRP and a terminal capability report on whether MAC-CE activation is possible for an enhanced SRI field or TPMI field indication (1851), and the corresponding terminal capability Upon receiving the report, the base station transmits (1801) a PUSCH repeated transmission configuration considering single DCI-based multiple TRP to the terminal (1802). In this case, the transmitted configuration information may include a repeated transmission method, the number of repeated transmissions, a transmission beam mapping unit or method, and a SRS resource set for a plurality of codebooks or non-codebooks. Upon receiving the configuration (1852), the UE receives the MAC-CE for activating the enhanced SRI field or the enhanced TPMI field indication (1853), and 3 ms after reception, transmits the HARQ-ACK to the base station (1803). When the number of repeated transmissions is 2 or more (1854), in case of codebook-based PUSCH transmission, if the received DCI has an enhanced SRI field and a TPMI field, or in the case of non-codebook-based PUSCH transmission, there is an enhanced SRI field in the successfully received DCI. If it is (1855), a first PUSCH transmission operation is performed (1856), otherwise, a second PUSCH transmission operation is performed (1857). The first PUSCH transmission operation is an operation in which all codepoints of the SRI field and the TPMI field receive DCI indicating a single SRI and a single TPMI indication and repeatedly transmit the PUSCH, and one transmission beam and/or one transmission precoder is applied. to repeatedly transmit the PUSCH. The second PUSCH transmission operation is performed by using the codepoint of the SRI and TPMI fields indicating a plurality of SRIs and TPMIs in the case of codebook-based PUSCH transmission, and the codepoint of the SRI field indicating a plurality of SRIs in the case of non-codebook-based PUSCH transmission. In the repetitive transmission operation, a PUSCH is repeatedly transmitted by applying a plurality of transmission beams and/or a plurality of transmission precoders. A method of mapping a plurality of transmit beams will be described in detail in the second embodiment.

<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 case of repeated PUSCH transmission considering multiple TRP, different parameters for each TRP may need to be applied for PUSCH transmission related parameters set by higher layer signaling or indicated by DCI for each PUSCH repeated transmission to multiple TRP. . For example, when multiple TRPs exist in different directions from the terminal, since the transmission beam or the transmission precoder may be different, it is necessary to configure or indicate the transmission beam or the transmission precoder for each TRP, 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 in order to increase power per RE for a TRP that exists at a relatively long distance compared to a specific TRP. Therefore, in order to transmit different information 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 that a PUSCH repeated transmission method considering multiple TRP based on multiple DCI is possible through the UE capability report. For the UE reporting the corresponding UE capability (eg, UE capability supporting PUSCH repeated transmission considering multiple DCI-based multiple TRP), the base station is configured through higher layer signaling, indicated 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 TRP 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 by each DCI in consideration of TRPs at different distances from the UE during repeated PUSCH transmission considering multiple TRPs based on multiple DCIs. The terminal may report to the base station whether different time/frequency resources can be allocated with the terminal capability. The base station can set whether to allocate different time/frequency resources to the terminal by 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 higher layer signaling configuration and the condition between 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 transmit 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. 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. there is. 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, if 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 of repeatedly transmitting a configured grant PUSCH in consideration of multiple TRP will be described. The terminal may report to the base station with terminal capability on whether or not to repeatedly transmit a configured grant PUSCH in consideration of multiple TRP. 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 set and instruct using a combination of higher layer signaling or L1 signaling. can

[Method 1] Activate a 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. The method of indicating a plurality of SRIs or TPMIs with a single DCI may follow the method of the 1-1 embodiment, and if there is only one grant configuration configured for the terminal, the HARQ process number field and the redundancy version field in the DCI All bits may be indicated as 0. If there is a plurality of configured grant settings in the terminal and one of them is activated as the DCI, the HARQ process number field in the DCI may indicate the index of the configured grant setting, and all bits of the redundancy version field are indicated as 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] Activate multiple DCI-based single configured grant settings

Method 2 is a method of instructing the UE to each SRI or TPMI with each DCI based on the multiple DCI, and activating a single configured grant setting along with the corresponding instruction. The method of indicating each SRI or TPMI to each DCI based on the multiple DCI can follow the method of the first 1-2 embodiment, and if there is only one grant configuration configured for the terminal, all HARQ processes in the corresponding multiple DCI All bits of the number field and the redundancy version field may be indicated as 0. If there is 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 each SRI or TPMI with each DCI based on the multiple DCI, and activating multiple configured grant settings along with the corresponding indication. The method of indicating each SRI or TPMI to each DCI based on multiple DCI may follow the method of the first 1-2 embodiment, a plurality of configured grant settings exist to the terminal, and the HARQ process number field in each DCI. It is possible to indicate the index of each configured grant setting through. 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 instructing (command) the connection between a plurality of configured grant settings activated by multiple DCI. The UE 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 a connection through the MAC-CE signaling If the (command) matches the received configured grant configuration indexes, PUSCH repeated transmission in consideration of multiple TRP can be performed 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 upper 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 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 differentiating the power control of the SRS resource set, the number of SRS resource sets can be 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 in consideration of 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 After receiving the MAC-CE that activates the connection between the specific CORESET (including all cases in which the value of CORESETPoolIndex is set to 0 or 1 or not set) and the SRS resource set, the UE transmits 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 that CORESETs set to 0 are connected with SRS resource set #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, the UE, which has been explicitly or implicitly configured or instructed to connect with different SRS resource sets and each TRP, sets srs-PowerControlAdjustmentStates set by higher layer signaling in each SRS resource set. You can expect it to be set to sameAsFci2 for the value, and not expect it to be set to separateClosedLoop. In addition, it can be expected that the usage set for higher 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 embodiments 1-1 and 1-4, from a terminal capable of performing codebook-based PUSCH repeated transmission in consideration of single DCI-based multiple TRP, the base station receives a terminal capability report from the terminal and receives a PUSCH through multiple TRP Upper layer signaling for performing repetitive transmission may be configured in the terminal. At this time, in the case of repeated PUSCH transmission considering single DCI-based multiple TRP 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 way 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. Meanwhile, 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 can 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.

In both Method 1 and Method 2, the number of layers indicated by two TPMI fields (the first TPMI field and the second TPMI field) may be the same in case of codebook-based repeated PUSCH transmission, and in the case of non-codebook-based PUSCH repeated transmission, both SRIs The number of layers indicated by the fields (the first SRI field and the second SRI field) may be the same.

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 the value (index) of one of the TPMI index candidates that are the same as the layer indicated by the first TPMI field, and accordingly, layer information may not be indicated.

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 code points out of 4 code points have a meaning of which SRI to indicate and the remaining 1 code point has no meaning, this code point is said to be a code point 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 by a plurality of TPMI fields through a reserved value 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 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). one value) may indicate only the TPMI index in the case where it is limited. 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. Specifically, the configuration of the second TPMI field will be described. If the first TPMI field and the corresponding TPMI index are indicated by the first TPMI field, 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 and a code point indicating a reserved value. For 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 the codepoints indicating the 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 is 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 be instructed with layer information and TPMI index information for repeated PUSCH transmission considering a single TRP as the first TPMI field. On the other hand, the above-described assumptions are 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 code point 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 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 can 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 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.

Meanwhile, as another method of supporting dynamic switching, dynamic switching is instructed by two SRI fields, and the UE can check layer information and TPMI index information for PUSCH repeated transmission considering multiple TRP or single TRP from two TPMI fields. 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. there is. 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, increase the number of bits in each SRI field by 1, and support dynamic switching with the last codepoint among codepoints indicating a reserved value based on the increased number of bits. can be used for

<Embodiment 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, in embodiments 1-6, a dynamic switching method for determining PUSCH transmission considering non-codebook-based single TRP or PUSCH transmission considering multiple TRP will be described.

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 repetitive transmission in consideration of single DCI based multiple TRP and repeats PUSCH through multiple TRP Upper layer signaling for performing transmission may be configured in the terminal. At this time, in the case of repeated PUSCH transmission considering single DCI-based multiple TRP 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 according to the following method, for example.

- [Method 1] Each SRI field can 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.

In both Method 1 and Method 2, the number of layers indicated by the two TPMI fields (the first TPMI field and the second TPMI field) may be the same in case of codebook-based repeated PUSCH transmission, and in the case of non-codebook-based PUSCH repeated transmission, both SRI fields The number of layers indicated by (the first SRI field and the second SRI field) may be the same.

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 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 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 codepoint indicating reserved values of a plurality of SRI fields included in the received DCI.

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, a value of one of 1 to 4) may indicate the SRS resource selection candidate in the limited case. 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, a total of four candidates exist, 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, the value of the SRI field indicating the SRS resource selection candidate for layer 3 is 10 to 13 in total, and the value of the SRI field indicating the SRS resource selection candidate for the layer 4 is 14 in total of 1 There may be two candidates. In this case, since there are 6 candidates for layer 2 and has the largest value, the number of bits of the second SRI field may be set to 3. In detail about the configuration of the second SRI field, 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 to SRI candidates 0 to 3 for layer 1 A code point indicating one of the values or other values may be interpreted as a code point having a reserved value. For 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 the second layer. 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, if 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 receive an SRI for repeated PUSCH transmission considering a single TRP as the first SRI field. On the other hand, the above-described assumptions are 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. there is. 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 a 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 codepoints 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 codepoints and the last codepoint 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.

<Embodiment 1-7: Dynamic switching method between single or multiple TRP-based PUSCH transmission using a new DCI field>

Embodiments 1-7 of the present disclosure describe a method of supporting dynamic switching between single or multiple TRP-based PUSCH transmission using a new DCI field.

The above-described 1-5 to 1-6 embodiments are not a separate additional new field in DCI, but single or multiple through a plurality of SRI fields or a plurality of TPMI fields indicated when performing support in consideration of multiple TRPs. Dynamic switching between TRP-based PUSCH transmissions may be performed. On the other hand, in this method, when it is impossible to operate only with the SRI field or the TPMI field, depending on whether the number of reserved codepoints of SRI or TPMI exists as much as the number of codepoints required to indicate dynamic switching between single or multiple TRP-based PUSCH transmission may exist, or it may be necessary to increase the bitwidth of the SRI field or the TPMI field in order to secure the additional number of reserved codepoints. Therefore, independent of the number of reserved codepoints in the SRI field or the TPMI field, an additional new DCI field may be used to support dynamic switching between single or multiple TRP-based PUSCH transmissions. An additional new DCI field for supporting dynamic switching between single or multiple TRP-based PUSCH transmission may be considered to have a bitwidth of 1 bit or 2 bits. Meanwhile, in the present embodiment, the bitwidth of the new DCI field may be 1 bit or 2 bits, or may have more bits. Hereinafter, a case where the bitwidth of the new DCI field is 1 bit or 2 bits will be described as an example.

[Method 1-7-1] When using the new DCI field with the bitwidth fixed to 2 bits

If an additional new DCI field of 2 bits is used, up to 4 codepoints can be used for dynamic switching between single or multiple TRP-based PUSCH transmissions. For example, the first codepoint '00' for the additional new DCI field may be used to indicate repeated PUSCH transmission in consideration of multiple TRPs. At this time, in the case of codebook-based PUSCH repeated transmission, the first SRI and the first TPMI field corresponding to the first TRP may be used to transmit first, and then the second SRI and the second corresponding to the second TRP. 2 It can be transmitted using the TPMI field. Alternatively, in the case of non-codebook-based PUSCH repeated transmission, the first SRI field corresponding to the first TRP may be used first and then transmitted during transmission to each TRP, and then transmitted using the second SRI field corresponding to the second TRP. can That is, in case of mapping each TRP for each PUSCH repeated transmission during repeated codebook or non-codebook-based PUSCH transmission, the mapping may be performed in the order of the first TRP and the second TRP (“multiple” as described later for the corresponding contents) Beam mapping order for TRP”). The second codepoint '01' for the additional new DCI field may be used to indicate repeated PUSCH transmission in consideration of a single TRP using the first TRP. The third codepoint '10' for the additional new DCI field may be used to indicate repeated PUSCH transmission in consideration of a single TRP using the second TRP. The fourth codepoint '11' for the additional new DCI field is set as a reserved codepoint, or the base station receives a terminal capability report supporting a change in the beam mapping order for multiple TRP from the terminal, and a corresponding higher layer signaling ( For example, when the upper layer setting for changing the beam mapping order for TRP) is set, PUSCH repeated transmission in consideration of multiple TRPs to which the beam mapping order for multiple TRPs of a different order from the first code point is set is indicated. can be used to In addition, regardless of the configuration of the above-described terminal capability report and corresponding higher layer signaling, it can be used to indicate repeated PUSCH transmission in consideration of multiple TRPs to which a beam mapping order for multiple TRPs different from the first code point is applied. there is. Here, changing the beam mapping order for multiple TRP means that when the first code point is used, transmission is performed in the order of the first TRP and the second TRP, as opposed to the second TRP, the first TRP It may mean to perform transmission in order. For repeated PUSCH transmission considering a single TRP among the descriptions of the above four code points, if a code point indicating repeated PUSCH transmission based on the first TRP is indicated to the terminal through an additional new DCI field from the base station, if the codebook In case of repeated PUSCH transmission based on PUSCH, the UE may perform first TRP based repeated PUSCH transmission using the first SRI field and the first TPMI field. The first TRP-based PUSCH repeated transmission may be performed using the SRI field. In this case, the first SRI field is connected to the first SRS resource set and may be used to indicate the SRS resource in the corresponding SRS resource set. In addition, if a codepoint indicating repeated second TRP-based PUSCH transmission is indicated to the terminal through an additional new DCI field from the base station, if it is a codebook-based PUSCH repeated transmission, the terminal receives the first SRI field and the first TPMI field can perform 2nd TRP-based repeated PUSCH transmission using . In this case, the first SRI field is connected to the second SRS resource set, and may be used to indicate the SRS resource in the corresponding SRS resource set. In the above-described single TRP (first or second TRP)-based repeated PUSCH transmission method, when either one of the first TRP or the second TRP is selected according to the codepoint indicated by the additional new DCI field, the codebook-based repeated PUSCH transmission method In the case of two SRI fields and the first of the two TPMI fields, the first SRI field and the first TPMI field are used, and in the case of repeated non-codebook-based PUSCH transmission, the first SRI field of the two SRI fields is used, and the second field Fields (the second SRI field and the second TPMI field) may be considered as an unused method. On the other hand, a single TRP-based repeated PUSCH transmission method, which will be described later, is different from the first TRP-based repeated PUSCH transmission method (that is, when the first TRP is selected or according to a code point, repeated transmission of a PUSCH based on the first TRP is indicated. If the first field (the first SRI field or the first TPMI field) is used, the second TRP-based PUSCH repeated transmission method (that is, when the second TRP is selected or the second TRP-based If repeated PUSCH transmission is indicated), it may be considered as a method of using the second field (the second SRI field or the second TPMI field). As another example of repeated PUSCH transmission in consideration of a single TRP among the descriptions of the four code points described above, if a code point instructing the UE through an additional new DCI field from the base station to the repeated transmission of the PUSCH based on the first TRP is indicated If it is, if it is a codebook-based PUSCH repeated transmission, the UE can perform the first TRP-based PUSCH repeated transmission using the first SRI field and the first TPMI field, and if it is a non-codebook-based PUSCH repeated transmission, The UE may perform repeated transmission of the PUSCH based on the first TRP by using the first SRI field. At this time, the first SRI field is connected to the first SRS resource set and may be used to indicate the SRS resource in the corresponding SRS resource set. In addition, if a code point indicating repeated transmission of the second TRP-based PUSCH is indicated to the terminal through an additional new DCI field from the base station, if it is a codebook-based repeated PUSCH transmission, the terminal receives a second SRI field and a second TPMI field can perform 2nd TRP-based repeated PUSCH transmission using . In this case, the second SRI field is connected to the second SRS resource set and may be used to indicate the SRS resource in the corresponding SRS resource set.

The above example shows an example of repeated PUSCH transmission considering multiple TRPs according to four codepoints or repeated PUSCH transmission considering single TRP, and the operation corresponding to each codepoint and the corresponding codepoint may be different from the example (e.g. For example, code point “11” may be used to indicate repeated PUSCH transmission considering multiple TRP, and code point “10” is code point “11” considering multiple TRP applying a beam mapping sequence for multiple TRPs different from that of code point “11”. It may be used to indicate repeated PUSCH transmission, and codepoint '00' may be used to indicate repeated PUSCH transmission considering a single TRP using the first TRP).

[Method 1-7-2] When using the new DCI field with the bitwidth fixed to 1 bit

The example described through Method 1-7-1 is an example of a case in which 2 bits are always used as the bitwidth of the additional new DCI field. Meanwhile, in order to reduce DCI overhead, the bit length of the additional new DCI field is fixed to 1 bit, and two SRI fields or two TPMI fields are additionally used together to support dynamic switching between single or multiple TRP-based PUSCH transmission. As an example, the additional new DCI field may be used to indicate whether PUSCH transmission considering single TRP or PUSCH transmission considering multiple TRPs. For example, if the new DCI field is indicated as '0', the UE may perform PUSCH transmission considering a single TRP. In addition, the two SRI fields or (if available) the second of the two TPMI fields (the second SRI field or the second TPMI field) may be used to indicate TRP, and the first SRI field or the first TPMI field indicates PUSCH transmission. can be used as information for That is, the second SRI field or the second TPMI field indicates one SRS resource set to be used for transmitting PUSCH among the two SRS resource sets whose purpose is 'codebook' or 'nonCodebook', and the first SRI field or the first TPMI field may indicate the SRS resource or TPMI index and layer information for the SRS resource set indicated by the second SRI or second TPMI field. Since the second SRI field and the second TPMI field are not used during PUSCH transmission considering a single TRP, the second SRI field or the second TPMI field may be reused for the purpose of selecting a TRP. For example, when an additional new DCI field for dynamic switching between single or multiple TRP-based PUSCH transmission is set to '0' and PUSCH transmission considering a single TRP is performed, the first code point of the second SRI field is the first TRP ( The first TRP), that is, the first SRS resource set (use 'codebook' or 'nonCodebook') may be reinterpreted to mean performing PUSCH transmission. Alternatively, if the second code point of the second SRI field is the second TRP (second TRP), that is, it means to perform PUSCH transmission based on the second SRS resource set (use is 'codebook' or 'nonCodebook'). can also be interpreted. On the other hand, this is only an example to explain the present embodiment, and the present embodiment is not limited thereto.

Alternatively, if the additional new DCI field is indicated as '1', the UE may perform PUSCH transmission in consideration of multiple TRPs. In this case, both SRI fields (the first SRI field and the second SRI field) or the two TPMI fields (the first TPMI field and the second TPMI field) may be used as information for PUSCH transmission considering multiple TRPs. For example, PUSCH transmission may be performed using the first SRI field and the first TPMI field corresponding to the first TRP, and PUSCH transmission may be performed using the second SRI field and the second TPMI field corresponding to the second TRP. can be done On the other hand, this is only an example to explain the present embodiment, and the present embodiment is not limited thereto.

[Method 1-7-3] When the bitwidth of the new DCI field is determined to be either 1 bit or 2 bits according to higher layer signaling and used

As another method of performing dynamic switching between single or multiple TRP-based PUSCH transmission using the additional new DCI field, the bitwidth of the additional new DCI field may be determined according to the conditions of higher layer signaling. The above-described dynamic switching method between single or multiple TRP-based PUSCH transmission using an additional new DCI field of 1-bit length can be used when the second SRI field or the second TPMI field exists. That is, if the second SRI field or the second TPMI field does not exist, it cannot be used. Meanwhile, whether the second SRI field or the second TPMI field does not exist may be determined based on the upper layer setting. For example, if non-codebook-based PUSCH transmission is performed and the number of SRS resources included in the second SRS resource set is 1, the second SRI field may not exist. As another example, if a codebook-based PUSCH transmission is performed and the number of SRS resources included in the second SRS resource set is 1 and the number of antenna ports set in the SRS resource is 1, both the second SRI field and the second TPMI field exist may not According to these rules, the base station can determine the existence of the second SRI field or the second TPMI field according to the upper layer configuration set in the terminal. The bitwidth of the new DCI field can be set to 1 bit or 2 bits. If the second SRI field or the second TPMI field exists according to the upper layer configuration of the base station, the base station may set the bitwidth of the additional new DCI field for dynamic switching between single or multiple TRP-based PUSCH transmission to 1 bit. If the second SRI field or the second TPMI field does not exist according to the upper layer configuration of the base station, the base station may set the bitwidth of an additional new DCI field for dynamic switching between single or multiple TRP-based PUSCH transmissions to 2 bits.

[Method 1-7-1] to [Method 1-7-3] for performing dynamic switching between single or multiple TRP-based PUSCH transmission using an additional new DCI field through the 1-7 embodiment are described below. It can be described as a series of actions. Meanwhile, the following operations may be performed sequentially or simultaneously, and some of them may be omitted.

1) The UE may report UE capability for operation in consideration of multiple TRP to the base station. At this time, the reported UE capability includes multiple TRP transmission mapping when reporting whether support for at least one of [Method 1-7-1] to [Method 1-7-3] and whether to support [Method 1-7-1] Order-related information may be included.

2) The base station sets and uses one of [Method 1-7-1] to [Method 1-7-3] as higher layer signaling according to the reported UE capability, or between the terminal and the base station, regardless of the UE capability. Dynamic switching for PUSCH repeated transmission considering single or multiple TRP based on one of [Method 1-7-1] to [Method 1-7-3] without specific higher layer signaling according to a standardly predetermined method can be done

A. When one of [Method 1-7-1] to [Method 1-7-3] is set and used according to higher layer signaling, the terminal sets [Method 1-7-1] to [Method 1-7] -3], dynamic switching for repeated PUSCH transmission in consideration of single or multiple TRP may be performed.

B. When using a standardly predetermined method between the terminal and the base station, based on any one determined according to the predetermined method among [Method 1-7-1] to [Method 1-7-3] Dynamic switching for repeated PUSCH transmission in consideration of single or multiple TRP may be performed.

<Second embodiment: Frequency hopping and transmission beam mapping method during repeated PUSCH transmission considering multiple TRP>

The second embodiment of the present disclosure describes a method of frequency hopping and transmission beam mapping for each PUSCH during repeated PUSCH transmission in consideration of multiple TRP. Here, the transmission beam may be an indicator that collectively refers to an SRS resource connected to one SRS spatial relation info, an SRS spatial relation, or an SRS spatial relation and TPMI. The frequency hopping method and the transmit beam mapping method may operate independently or subordinately to each other, configured by higher layer signaling, indicated by L1 signaling, or a combination of upper layer signaling configuration and L1 signaling. The fact that the frequency hopping method and the transmit beam mapping method are performed independently of each other means that the two methods are independent signaling (eg, set by higher layer signaling, indicated by L1 signaling, set by higher layer signaling, and indicated by L1 signaling) combination) and means to be delivered to the terminal. However, the number of all cases of the frequency hopping method and the number of all cases of the transmit beam mapping method may not be all possible combinations. For example, when there are 3 and 4 frequency hopping methods and 4 transmission beam mapping methods, respectively, all 12 combinations may not be supported, but only 10 combinations may be supported. Each item will be described in detail through the following detailed examples.

<Embodiment 2-1: Transmission Beam Mapping Method for Repeated PUSCH Transmission Considering Multiple TRP>

In the 2-1 embodiment, a transmission beam mapping method for repeated PUSCH transmission in consideration of multiple TRP will be described. When a plurality of transmission beams are configured by the base station as higher layer signaling, indicated by L1 signaling, or transmitted by a combination of configuration and L1 signaling by higher layer signaling, the UE transmits the transmission beam during repeated PUSCH transmission considering multiple TRPs. You can decide how to do it. The information on the plurality of transmission beams may be an SRI to which a plurality of SRS spatial relation info is connected, or an SRI to which one SRS spatial relation info is connected. The base station sets the transmission beam mapping unit to higher layer signaling, that is, information on how to map which transmission beam to each PUSCH repeated transmission among the plurality of transmission beam information received by the UE, or indicates by L1 signaling, or It can be delivered by a combination of upper layer signaling configuration and L1 signaling indication. In addition, in the case of repeated PUSCH transmission in consideration of multiple TRP, the total number of repeated PUSCH transmissions may be set by higher layer signaling, indicated by L1 signaling, or delivered by a combination of upper layer signaling configuration and L1 signaling instruction.

The following candidates may be available for the transmit beam mapping unit.

- Each slot, subslot or multiple slots, subslots

- Each repeated transmission (nominal or actual) or multiple repeated transmissions (nominal or actual)

- Each symbol or multiple symbols

- 1/N of the total number of repeated transmissions

If the unit of transmission beam mapping is a slot, the same transmission beam is applied to all PUSCH repeated transmissions (nominal or actual) in the slot, and the transmission beam change is performed in units of slots. For example, if the total number of repeated PUSCH transmissions is 4, the number of transmission beams is 2, the transmission beam mapping unit is a slot, and there are two repeated PUSCH transmissions in each slot, the first and The first transmission beam may be applied to the second repeated PUSCH transmission, and the second transmission beam may be applied to the third and fourth repeated PUSCH transmissions transmitted in the second slot. As another example, if the total number of repeated transmissions is 4, the number of transmission beams is 2, the transmission beam mapping unit is 2 slots, and one PUSCH repeated transmission is performed in each slot, in the first slot and the second slot The first transmission beam may be applied to the first and second repeated PUSCH transmissions transmitted respectively, and the second transmission beam may be applied to the third and fourth repeated PUSCH transmissions transmitted in the third and fourth slots, respectively.

If the unit of transmission beam mapping is 1/N of the total number of repeated PUSCH transmissions, N may be a divisor of the total number of repeated transmissions, or a natural number equal to or smaller than the total number of repeated transmissions while being 2 or more. For example, when the total number of repeated PUSCH transmissions is 6, the number of transmission beams is 2, and the transmission beam mapping unit is 1/2 (N=2) of the total number of repetitions, the UE repeatedly transmits the 1st to 3rd PUSCH The first transmission beam may be applied to , and the second transmission beam may be applied to the 4th to 6th repeated PUSCH transmissions.

In addition, a fixed transmission beam mapping unit is used among the above transmission beam mapping units, or the terminal is configured with higher layer signaling from the base station, or indicated by L1 signaling, or by a combination of setting and L1 signaling. For the received transmit beam mapping unit, the base station sets the transmit beam mapping method to the UE as higher layer signaling for one of cyclical or sequential, or indicates L1 signaling, or a combination of upper layer signaling and L1 signaling. can be transmitted as For example, when the total number of repeated PUSCH transmissions is 6, the number of transmission beams is 2, the transmission beam mapping unit is each repeated transmission (nominal or actual), and the transmission beam mapping method is cyclical, the terminal is an odd-numbered PUSCH The first transmission beam may be applied to repeated transmission, and the second transmission beam may be applied to even-numbered PUSCH repeated transmission. In addition, when the transmission beam mapping method is sequential, the number of transmission beam mapping units to which the same transmission beam is applied may be two or a divisor of the total number of repeated transmissions, and the corresponding information may be predetermined (eg, without specific signaling). fixed to two), set by higher layer signaling, indicated by L1 signaling, or transmitted by a combination of setting and instruction of L1 signaling by higher layer signaling. In the above example, if the transmit beam mapping method is sequential and the number of transmit beam mapping units to which the same transmit beam is applied is two, the terminal applies the first transmit beam to the first and second PUSCH repeated transmissions, 3, The 2nd transmission beam may be applied to the 4th repeated PUSCH transmission, and the 1st transmission beam may be applied to the 5th and 6th repeated PUSCH transmissions.

<Embodiment 2-2: Independent frequency hopping and transmission beam mapping method>

In embodiment 2-2, a method of independently performing a frequency hopping method and a transmission beam mapping method during repeated PUSCH transmission in consideration of multiple TRP will be described. Similar to the transfer procedure for the transmission beam mapping unit from the base station to the terminal, the frequency hopping method is set by higher layer signaling from the base station to the terminal, indicated by L1 signaling, or a combination of upper layer signaling and the instruction of L1 signaling. can be delivered to Also, the terminal may receive from the base station the frequency hopping method independently of the transfer process for the transmission beam mapping unit from the base station. In the case of a frequency hopping unit, the following candidates may be possible.

- Between slots or multiple slots

- In-slot frequency hopping method

- Frequency hopping method between repeated transmissions or between multiple repeated transmissions

- Frequency hopping method within repeated transmission

The UE may independently apply the frequency hopping method and transmission beam mapping unit configured by higher layer signaling, indicated by L1 signaling, or received by a combination of upper layer signaling and L1 signaling.

19 is a view for explaining a method of independently determining frequency hopping and transmission beam mapping during repeated PUSCH transmission in consideration of multiple TRP according to an embodiment of the present disclosure. For example, the repeated PUSCH transmission method is PUSCH repeated transmission type B, the total number of repeated PUSCH transmissions (eg, the number of nominal repetitions) is 5, the symbol length of the nominal repetition is 10, and the frequency hopping method is between nominal repetitions. When the frequency hopping method is used, the transmission beam mapping unit is a slot, the number of repeated PUSCH transmissions in the slot is 1, the starting RB position is RB 0, and the RB offset due to frequency hopping is 10 RB, the terminal is the first (1901) , 1902) and the 3rd (1905, 1906) slots apply the 1st transmission beam, and apply the 2nd transmission beam in the 2nd (1903, 1904) and 4th (1907) slots. The terminal transmits the first actual repetition (1901) in RB#0 in slot#1, and transmits the second actual repetition (1902) in RB#10 in slot#1. The terminal transmits the third actual repetition (1903) in RB#10 in slot #2, and transmits the fourth actual repetition (1904) in RB#0 in slot #2. The terminal transmits the 5th actual repetition (1905) in RB#0 in slot #3, and transmits the 6th actual repetition (1906) in RB#10 in slot #3. The terminal transmits the 7th actual repetition (1907) in RB #0 in slot #4.

In addition, when a combination of a specific frequency hopping method and a transmission beam mapping unit is transmitted as a combination of a specific frequency hopping method and a transmission beam mapping unit as a higher layer signaling, as indicated by L1 signaling, or as a combination of a setting and an instruction of L1 signaling, the base station and the terminal transmit different transmissions In addition to a change in transmission power due to beam application, one or a plurality of symbol gaps may be inserted between each frequency hopping of frequency hopping or between each repeated transmission, or one or a plurality of transmission symbols may be dropped.

In addition, the base station and the terminal may not support the combination of the specific frequency hopping method and the transmission beam mapping unit as described above. For example, when frequency hopping does not occur when a combination of a specific frequency hopping method and a transmit beam mapping unit is used or only one transmit beam mapping occurs, the corresponding combination may not be supported. For example, if the total number of repeated PUSCH transmissions is 2, the frequency hopping unit is a slot, the transmission beam mapping unit is each PUSCH repeated transmission, and the number of repeated PUSCH transmissions in the slot is 2, the terminal is the first in the first slot The first transmission beam is mapped for repeated PUSCH transmission, the second transmission beam is mapped to the second PUSCH repetition transmission, and frequency hopping is not performed. The UE may not expect such a combination from the base station to be set as higher layer signaling, indicated by L1 signaling, or transmitted as a combination of setting and instruction of L1 signaling by higher layer signaling.

<Embodiment 2-3: Dependent Frequency Hopping and Transmission Beam Mapping Method>

In Embodiment 2-3, a method for performing a frequency hopping method and a transmission beam mapping method for repeated PUSCH transmission in consideration of multiple TRPs will be described in dependence on each other. Determining the frequency hopping method and the transmission beam mapping method dependent on each other is to maximize frequency diversity and spatial diversity for repeated PUSCH transmission in consideration of multiple TRP. For example, the frequency hopping unit may be larger than the transmit beam mapping unit. That is, the UE may transmit the PUSCH by applying different transmission beams at the same frequency position, and may perform frequency hopping to another frequency position and transmit the PUSCH by applying different transmission beams at the corresponding position. As another example, the frequency hopping unit may be smaller than the transmit beam mapping unit. That is, the UE may transmit the PUSCH at different frequency positions by applying the same transmission beam, and may transmit the PUSCH at different frequency positions by applying different transmission beams. As described above, the following three methods may be considered for the method of having the dependency between the frequency hopping unit and the transmit beam mapping unit.

[Method 1] Using independent settings of frequency hopping and transmit beam mapping units

The UE may perform dependent frequency hopping and transmit beam mapping by using the frequency hopping method and each transmission method of the transmit beam mapping unit. Each delivery method may be the same as above, but additional restrictions may exist.

As an example, when the terminal is set with higher layer signaling for the frequency hopping method and the transmit beam mapping method from the base station, is instructed by L1 signaling, or is set and instructed by a combination of higher layer signaling and L1 signaling, the frequency hopping unit is transmitted It can be expected that it is smaller than the beam mapping unit. For example, when the UE is configured with higher layer signaling in units of slots, or instructed by L1 signaling, or configured and instructed by a combination of higher layer signaling and L1 signaling, the UE transmits beams in units larger than slots. It is not expected that the mapping unit is set by higher layer signaling, instructed by L1 signaling, or set and instructed by a combination of higher layer signaling and L1 signaling.

As another example, when the terminal is set with higher layer signaling for the frequency hopping method and the transmit beam mapping method from the base station, is instructed by L1 signaling, or is set and instructed by a combination of higher layer signaling and L1 signaling, frequency hopping unit can be expected to be larger than the transmit beam mapping unit. For example, when the terminal is configured with higher layer signaling in units of slots, or instructed by L1 signaling, or configured and instructed by a combination of higher layer signaling and L1 signaling, the terminal transmits beams in units smaller than slots. It is not expected that the mapping unit is set by higher layer signaling, instructed by L1 signaling, or set and instructed by a combination of higher layer signaling and L1 signaling.

[Method 2] Transmit beam mapping unit setting based on frequency hopping unit setting

The UE may support a transmission beam mapping unit according to the frequency hopping method configured and instructed by the base station as higher layer signaling, L1 signaling, or a combination of higher layer signaling and L1 signaling. That is, the UE may set and receive a transmission beam mapping unit as a multiple of the configured or instructed frequency hopping unit. For example, if the terminal sets or receives a slot unit frequency hopping method from the base station, the terminal may configure or receive a transmission beam mapping unit in one slot or a plurality of slots.

20 is a diagram for explaining transmission beam mapping unit setting based on frequency hopping unit setting according to an embodiment of the present disclosure. The number of repeated PUSCH transmissions is 4, the frequency hopping method in units of slots, the transmission beam mapping unit is set or indicated to 2, so that the transmission beam mapping is performed in units of 2 slots, the number of repeated PUSCH transmissions in the slot is 1, Assuming that the starting RB position is RB 0 and the frequency hopping RB offset is 10 RB, the UE transmits the PUSCH by applying the first transmission beam in RB 0 to the first PUSCH repeated transmission in the first slot (2001). ), transmits the PUSCH by applying the first transmission beam in RB 10 for the second PUSCH repeated transmission in the second slot (2002), and the second transmission in RB 0 for the third PUSCH repeated transmission in the third slot A PUSCH is transmitted by applying a beam (2003), and for a fourth PUSCH repeated transmission in a fourth slot, a PUSCH is transmitted by applying a second transmission beam in RB 10 (2004).

In addition, the UE may set or receive a transmission beam mapping unit in a unit lower than the configured or instructed frequency hopping unit. The base station may apply the following two methods to set or indicate the transmit beam mapping unit to be lower than the frequency hopping unit.

[Method 3] Define available frequency hopping units as a set, and select a transmit beam mapping unit from within the set

The UE may pre-define a set including units of available frequency hopping. The set can be defined in the following order.

- Unit 1. In actual PUSCH repeated transmission

- Unit 2. actual PUSCH repeated transmission

- Unit 3. In nominal PUSCH repeated transmission

- Unit 4. nominal PUSCH repeated transmission

- Unit 5. Slot

The UE is set and instructed by higher layer signaling, L1 signaling, or a combination of higher layer signaling and L1 signaling to determine how many units lower than the frequency hopping unit in the set for the transmit beam mapping unit. can For example, if the terminal has set or instructed a slot unit frequency hopping method of unit 5 from the base station, and is configured and instructed to use the transmit beam mapping unit as a unit one step lower than the frequency hopping unit, the terminal sets the transmit beam Mapping may be performed in units of 4 nominal PUSCH repetition transmission units.

In addition, in the case of repeated PUSCH transmission in consideration of multiple TRP, the UE sets a transmit beam mapping unit, a transmit beam mapping method, and a frequency hopping method as higher layer signaling or L1 signaling, or a combination of upper layer signaling and L1 signaling. When transmitted as , the frequency hopping method may be ignored in order to reduce the burden on the terminal. In addition, when the transmit beam mapping unit, transmit beam mapping method, and frequency hopping method are set as higher layer signaling or indicated by L1 signaling, or transmitted as a combination of upper layer signaling and L1 signaling, transmit beam mapping It is not expected that both the unit and the frequency hopping unit are applied within the slot (eg, when the transmission beam mapping unit is actual repetition and the frequency hopping unit is repeated transmission within the slot).

<Third embodiment: PUSCH transmission beam mapping method considering slot format during repeated PUSCH transmission considering multiple TRP>

As an embodiment of the present disclosure, a method of mapping a PUSCH transmission beam in consideration of a slot format will be described. In the 3-1 embodiment, a method for the base station to indicate the slot format to the terminal is described, and in the 3-2 embodiment, a transmission beam considering the slot format for a dynamic grant-based or configured grant-based PUSCH repeated transmission in consideration of multiple TRP A mapping method will be described.

<Embodiment 3-1: Slot Format Instruction Method>

In the 3-1 embodiment, a method for the base station to indicate a slot format to the terminal will be described. In the 5G communication system, the downlink signal transmission section and the uplink signal transmission section may be dynamically changed. To this end, the base station may indicate to the terminal whether each of the OFDM symbols constituting one slot is a downlink symbol, an uplink symbol, or a flexible symbol through a slot format indicator (SFI). Here, the flexible symbol may mean neither a downlink nor an uplink symbol, or a symbol that can be changed to a downlink or uplink symbol by UE-specific control information or scheduling information. In this case, the flexible symbol may include a gap period (Gap guard) required in the process of switching from downlink to uplink.

Upon receiving the slot format indicator, the terminal may perform a downlink signal reception operation from the base station in a symbol indicated by a downlink symbol, and may perform an uplink signal transmission operation to the base station in a symbol indicated by the uplink symbol. there is. For a symbol indicated by a flexible symbol, the terminal may perform at least a PDCCH monitoring operation, and through another indicator, for example, DCI, the terminal performs a downlink signal reception operation from the base station in the flexible symbol (for example, For example, when DCI format 1_0 or 1_1 is received), an uplink signal transmission operation to the base station may be performed (eg, when DCI format 0_0 or 0_1 is received).

21 is a diagram illustrating an example of an uplink-downlink configuration (UL/DL configuration) in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 21, three steps of uplink-downlink configuration of symbols/slots are illustrated. In the first step, the uplink-downlink of the symbol/slot through the cell-specific configuration information 2110 for configuring the uplink-downlink in semi-static, for example, system information such as SIB can be set. Specifically, the cell-specific uplink-downlink configuration information 2010 in the system information may include uplink-downlink pattern information and information indicating a reference subcarrier interval. The uplink-downlink pattern information includes a transmission periodicity 2103 of each pattern and the number of consecutive full DL slots at the beginning of each DL-UL pattern from the start point of each pattern. ) (2111) and the number of consecutive DL symbols in the beginning of the slot following the last full DL slot (2112) from the beginning of the next slot, and consecutive uplink from the end of each pattern. Number of consecutive full UL slots at the end of each DL-UL pattern (2113), and Number of consecutive UL symbols in the end of the slot preceding the first full UL slot ( 2114) may be indicated. In this case, the UE may determine a slot/symbol not indicated by uplink or downlink as a flexible slot/symbol.

In a second step, the UE-specific configuration information 2120 delivered through UE-specific higher layer signaling (ie, RRC signaling) is a flexible slot or a slot including a flexible symbol (2121, 2122). may indicate symbols to be configured as downlink or uplink in the . For example, the terminal-specific uplink-downlink configuration information 2120 includes a slot index indicating slots 2121 and 2122 including flexible symbols, and the number of consecutive downlink symbols from the start of each slot. DL symbols in the beginning of the slot (2123, 2125) and the number of consecutive UL symbols in the end of the slot (2124, 2126) from the end of each slot, or For each slot, information indicating the entire downlink or information indicating the entire uplink may be included. In this case, the symbol/slot configured as uplink or downlink through the cell specific configuration information 2110 of the first step cannot be changed to downlink or uplink through the UE-specific higher layer signaling 2120. .

Finally, in order to dynamically change the downlink signal transmission interval and the uplink signal transmission interval, the downlink control information of the downlink control channel includes a plurality of slots starting from the slot in which the UE detects the downlink control information. A slot format indicator 2130 indicating whether each symbol in each slot is a downlink symbol, an uplink symbol, or a flexible symbol may be included. In this case, for the symbol/slot configured as uplink or downlink in the first and second steps, the slot format indicator cannot indicate that it is downlink or uplink. The slot format of each slot 2131,2132 including at least one symbol that is not set to uplink or downlink in the first and second steps may be indicated by the corresponding downlink control information.

The slot format indicator may indicate the uplink-downlink configuration for 14 symbols in one slot as shown in Table 17-1 below. The slot format indicator may be simultaneously transmitted to a plurality of terminals through a terminal group (or cell) common control channel. In other words, the downlink control information including the slot format indicator may be transmitted through a CRC-scrambled PDCCH with an identifier different from the UE-specific cell-RNTI (C-RNTI), for example, an SFI-RNTI. The downlink control information may include a slot format indicator for one or more slots, that is, N slots. Here, the value of N may be an integer greater than 0, or a value set by the UE through higher layer signaling from the base station among a set of predefined possible values, such as 1, 2, 5, 10, 20, or the like. The size of the slot format indicator may be set by the base station to the terminal through higher layer signaling.

[Table 17-1]

In [Table 17-1], D denotes a downlink symbol, U denotes an uplink symbol, and F denotes a flexible symbol. According to [Table 17-1], the total number of supportable slot formats for one slot is 256. In the NR system, the maximum size of information bits that can be used for slot format indication is 128 bits, and the base station can set it to the terminal through higher layer signaling, for example, 'dci-PayloadSize'.

In this case, a cell operating in a licensed or unlicensed band may set and indicate an additional slot format as shown in [Table 17-2] by introducing one or more additional slot formats or modifying at least one of the existing slot formats. . [Table 17-2] shows an example of additional slot formats in which one slot consists only of an uplink symbol and a flexible symbol (F).

[Table 17-2]

In an embodiment, the downlink control information used for the slot format indication may indicate the slot format(s) for a plurality of serving cells, and the slot format(s) for each serving cell is a serving cell ID (serving). cell ID). In addition, a slot format combination for one or more slots for each serving cell may be indicated by downlink control information. For example, when the size of one slot format indicator index field in downlink control information is 3 bits and indicates the slot format for one serving cell, the 3-bit slot format indicator index field has a total of 8 slot formats. (or slot format combination) may be indicated, and the base station may indicate the slot format indicator index field through terminal group common downlink control information (common DCI).

In an embodiment, at least one slot format indicator index field included in the downlink control information may be configured as a slot format combination indicator for a plurality of slots. For example, [Table 17-3] shows a 3-bit slot format combination indicator composed of the slot formats of [Table 17-1] and [Table 17-2]. Among the values of the slot format combination indicator, {0, 1, 2, 3, 4} indicates the slot format for one slot. The remaining three values {5, 6, 7} indicate the slot format for 4 slots, and the UE indicates the 4 slots sequentially from the slot in which the downlink control information including the slot format combination indicator is detected. slot format can be applied.

[Table 17-3]

In an embodiment, if the terminal is not configured to monitor DCI format 2_0, some symbols of a specific slot are set as flexible symbols (F) or of a specific slot according to the slot format configured through higher layer signaling. If the slot format is not configured, the UE receives DCI, RAR UL grant, fallbackRAR UL grant, or successRAR for some symbols in the slot and receives PUSCH, PUCCH, PRACH, or SRS indicated in the received information. can be transmitted

In an embodiment, if some symbols of a specific slot are set as flexible symbols (F) based on the slot format set through higher layer signaling, the terminal transmits in some symbols of the corresponding slot based on higher layer signaling It is not expected to receive the uplink transmission configuration to be, for example, configured grant-based PUSCH, PUCCH, or SRS.

In an embodiment, if the UE is scheduled for PUSCH transmission for a plurality of slots in DCI format 0_1, and through higher layer signaling, at least one of the symbols at a position where the PUSCH should be transmitted in one of the plurality of slots through higher layer signaling. If is set to DL, the UE does not transmit PUSCH in the corresponding slot.

In an embodiment, if some symbols of a specific slot are set as flexible symbols (F) by higher layer signaling or the slot format is not set for a specific slot, the terminal receives DCI format 2_0 and the slot format indicator value is 255 No, flexible symbol (F) was indicated for some symbols of the slot, and if the terminal received a DCI format, RAR UL grant, or successRAR indicating PUSCH, PUCCH, PRACH, or SRS in the flexible symbol, the terminal may perform transmission for PUSCH, PUCCH, PRACH, or SRS within the corresponding flexible symbol in the corresponding slot.

In an embodiment, if some symbols of a specific slot are set as flexible symbols (F) by higher layer signaling or the slot format is not set for a specific slot, the terminal receives DCI format 2_0 and the slot format indicator value is 255 No, if the UE is configured to transmit PUCCH, PUSCH, or PRACH through higher layer signaling for some symbols in the corresponding slot, the UE uses DCI format 2_0 for uplink symbols (UL) for some symbols in the corresponding slot. ), the preset PUCCH, PUSCH, or PRACH may be transmitted only when indicated by .

<Embodiment 3-2: Transmission Beam Mapping Method Considering Slot Format During PUSCH Repeated Transmission>

As an embodiment of the present disclosure, in embodiment 3-2, a transmission beam mapping method in consideration of a slot format for a dynamic grant or a configured grant-based PUSCH repeated transmission in consideration of multiple TRP will be described. In this case, as in the 1-1 and 1-2, the dynamic grant-based PUSCH repeated transmission considering multiple TRP means a case where repeated PUSCH transmission considering multiple TRP is indicated based on DCI, and the first 1- As in the third embodiment, repeated PUSCH transmission based on configured grant considering multiple TRP means that repeated PUSCH transmission considering multiple TRP based on higher layer configuration can be configured or activated/deactivated.

As described above, the UE configures an uplink symbol (UL), a downlink symbol (DL), or a flexible symbol (F) for some symbols in a specific slot or slots through higher layer signaling for slot format information can receive Also, as described above, if the terminal is not configured to monitor for DCI format 2_0, the terminal may follow the slot format configured through higher layer signaling. At this time, since the UE can know about the semi-static slot format based on higher layer signaling without additional information dynamically indicated, PUSCH transmission is impossible in which slot and in which symbol for repeated PUSCH transmission based on dynamic grant or configured grant? information can be obtained in advance. Therefore, when the terminal is not configured to monitor DCI format 2_0, the terminal may apply the transmission beam mapping to the actual transmitted PUSCH transmission for the PUSCH repeated transmission in consideration of the dynamic grant or configured grant-based multiple TRP. Alternatively, even if information on the semi-static slot format is known, transmission beam mapping may be applied to a PUSCH transmission position in consideration of both the actually transmitted PUSCH and the canceled PUSCH transmission. As mentioned above, repeated PUSCH transmission considering dynamic grant-based multiple TRP enables actual transmission of PUSCH in a flexible symbol (F) or an uplink symbol (UL), and repeated PUSCH transmission considering the configured grant-based multiple TRP is The actual transmission of the PUSCH is possible in the uplink symbol (UL). Details will be described below with reference to FIG. 22 .

In addition, as described above, if the terminal is configured to monitor for DCI format 2_0, the terminal receives a slot format indicator in DCI format 2_0 and uplink symbols (UL) for some symbols in a specific slot or slots , a downlink symbol (DL), or a flexible symbol (F). At this time, due to the slot format information that is dynamically indicated through DCI format 2_0 in addition to the semi-statically configured information, the UE determines whether PUSCH transmission is impossible in any symbol of a certain slot for repeated PUSCH transmission based on a dynamic grant or a configured grant. It is difficult to know the information in advance. Therefore, when the UE is configured to monitor DCI format 2_0, the UE performs transmission beam mapping for repeated PUSCH transmission in consideration of dynamic grant or configured grant-based multiple TRP, PUSCH considering both the actually transmitted PUSCH and the canceled PUSCH transmission. It can be applied to the transmission location. Alternatively, transmission beam mapping may be performed only for the actually transmitted PUSCH transmission in consideration of the dynamic slot format. As mentioned above, repeated PUSCH transmission considering dynamic grant-based multiple TRP enables actual transmission of PUSCH in a flexible symbol (F) or an uplink symbol (UL), and repeated PUSCH transmission considering the configured grant-based multiple TRP is The actual transmission of the PUSCH is possible in the uplink symbol (UL). Details will be described with reference to FIG. 22 .

22 is a diagram illustrating various transmission beam mapping methods according to slot formats for dynamic grant-based PUSCH repeated transmission according to an embodiment of the present disclosure. The slot format 22-001 of FIG. 22 may be a slot format configured through higher layer signaling, or a slot format in which instructions through DCI format 2_0 are considered in addition to configuration through higher layer signaling. If the UE receives PUSCH repetition type B as higher layer signaling in the PUSCH repetition transmission method, the number of repeated transmissions is 10, and the number of transmission symbols per nominal repetition is 10, nominal repetition is expressed as 22-002. can At this time, in consideration of the downlink (DL) symbol 22-008, the flexible (F) symbol 22-009, and the uplink (UL) symbol 22-010, the actual repetition actually transmitted during nominal repetition is It can be expressed as 22-003. In this case, two transmission beam mapping types may be determined in consideration of the slot format. Transmission beam mapping type 1 (22-004, 22-006) is to perform transmission beam mapping on a PUSCH transmission position in consideration of both the actual transmitted PUSCH and the canceled PUSCH transmission, and the transmission beam mapping type 2 (22-005, 22-007) means that transmit beam mapping is performed only for the actually transmitted PUSCH transmission. 22-004 to 22-007 of FIG. 22 are diagrams illustrating how transmit beam mapping is performed according to each transmit beam mapping type and transmit beam mapping method (eg, sequential and cyclical). Here, the transmission beam mapping unit is actual repetition.

23A is a diagram illustrating an operation of a terminal for transmission beam mapping in consideration of a slot format according to an embodiment of the present disclosure. As described above, the UE reports to the base station the UE capability on whether to support the dynamic grant or configured grant-based PUSCH repeated transmission in consideration of single or multiple DCI-based multiple TRP (2301). Thereafter, the UE receives configuration information related to repeated transmission of a dynamic grant or a configured grant in consideration of single or multiple DCI-based multiple TRP through higher layer signaling (2302). In addition, the terminal receives slot format configuration related information through higher layer signaling (2303). Depending on whether the UE has configured DCI format 2_0 monitoring (2304), if the UE is configured to monitor DCI format 2_0 and is instructed to repeatedly transmit a PUSCH scheduled by DCI (2305), the UE is based on the 1-1 beam mapping A transmit operation 2306 may be performed. Here, the 1-1 beam mapping-based transmission operation may be determined through a combination of the above-described transmission beam mapping type 1 or 2, the transmission beam mapping method cyclical or sequential, and the transmission beam mapping unit. Since it is a PUSCH, PUSCH transmission can be performed in a flexible symbol (F) and an uplink (UL) symbol. If the UE is configured or instructed to transmit PUSCH based on a configured grant (2305), the UE may perform a 2-1 beam mapping-based transmission operation (2307). Here, the 2-1 beam mapping-based transmission operation may be the transmission beam mapping type 1 or 2, and since it is a grant-based PUSCH configured as described above, PUSCH transmission may be performed only in an uplink (UL) symbol. In addition, depending on whether DCI format 2_0 monitoring is configured by the terminal (2304), if the terminal is not configured to monitor DCI format 2_0 and is instructed to repeatedly transmit a PUSCH scheduled by DCI (2308) A beam mapping-based transmission operation 2309 may be performed. Here, the 1-2-th beam mapping-based transmission operation may be determined through a combination of the above-described transmission beam mapping type 1 or 2, the transmission beam mapping method cyclical or sequential, and the transmission beam mapping unit. Since it is a PUSCH, PUSCH transmission can be performed in a flexible symbol (F) and an uplink (UL) symbol. If the terminal is configured or instructed to transmit PUSCH based on a configured grant (2308), the terminal may perform a 2-2 beam mapping-based transmission operation (2310). Here, the 2-2 beam mapping-based transmission operation may be determined through a combination of the above-described transmission beam mapping type 1 or 2, the transmission beam mapping method cyclical or sequential, and the transmission beam mapping unit, and the grant-based PUSCH configured as described above. Therefore, PUSCH transmission can be performed only in uplink (UL) symbols.

23B is a diagram illustrating an operation of a base station for transmission beam mapping in consideration of a slot format according to an embodiment of the present disclosure. As described above, the base station may receive a report on the terminal capability from the terminal on whether to support the dynamic grant or configured grant-based PUSCH repeated transmission in consideration of single or multiple DCI-based multiple TRP (2351). Thereafter, the base station may transmit configuration information related to repeated transmission of a PUSCH based on a dynamic grant or a configured grant considering single or multiple DCI-based multiple TRP through higher layer signaling (2352). Also, the base station may transmit slot format configuration related information through higher layer signaling (2353). Depending on whether the base station has configured DCI format 2_0 monitoring in the terminal (2354), if DCI format 2_0 monitoring is configured in the terminal and repeated transmission is instructed for a PUSCH scheduled by DCI (2355), the base station is the 1-1 beam A mapping-based reception operation 2356 may be performed. Here, the 1-1 beam mapping-based reception operation may be determined through a combination of the above-described transmission beam mapping type 1 or 2, the transmission beam mapping method cyclical or sequential, and the transmission beam mapping unit. Since it is a PUSCH, an operation for receiving a PUSCH transmitted in a flexible symbol (F) and an uplink (UL) symbol may be performed. If the configured grant-based PUSCH transmission is configured or instructed to the terminal (2355), the base station may perform the 2-1 beam mapping-based reception operation (2357). Here, the 2-1 beam mapping-based reception operation may be the transmission beam mapping type 1 or 2, and since it is a grant-based PUSCH configured as described above, an operation of receiving a PUSCH transmitted only in an uplink (UL) symbol is performed. can In addition, depending on whether DCI format 2_0 monitoring is configured in the terminal (2354), if DCI format 2_0 monitoring is not configured in the terminal and repeated transmission is instructed for a PUSCH scheduled through DCI (2358), the base station is the first -2 A beam mapping-based reception operation 2359 may be performed. Here, the 1-2 beam mapping-based reception operation may be determined through a combination of the above transmission beam mapping type 1 or 2, the transmission beam mapping method cyclical or sequential, and the transmission beam mapping unit. Since it is a PUSCH, an operation for receiving a PUSCH transmitted in a flexible symbol (F) and an uplink (UL) symbol may be performed. If the UE has configured or instructed PUSCH transmission based on the configured grant (2358), the base station may perform a 2-2 beam mapping-based reception operation (2360). Here, the 2-2 beam mapping-based reception operation may be determined through a combination of the transmission beam mapping type 1 or 2, the transmission beam mapping method cyclical or sequential, and the transmission beam mapping unit, and the grant-based PUSCH configured as described above. Therefore, it is possible to perform an operation for receiving a PUSCH transmitted only in an uplink (UL) symbol.

24 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. 24 , the terminal includes a transceiver, a memory (not shown) and a terminal processing unit (24-05, or a terminal control unit or processor) that refer to a terminal receiving unit 24-00 and a terminal transmitting unit 24-10. may include According to the communication method of the terminal described above, the transceiver units 24-00 and 24-10, the memory and the terminal processing unit 24-05 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 exemplary 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 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.

25 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. 25 , the base station may include a base station receiving unit 25-00 and a transceiver referring to the base station transmitting unit 25-10, a memory (not shown), and a base station processing unit 25-05, or a base station control unit or processor. can According to the above-described communication method of the base station, the transceiver units 25-00 and 25-10, the memory and the base station processing unit 25-05 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 exemplary 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 the wireless channel and output the signal 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 a component control operation 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 composed 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 the 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 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, 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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