WO2024144316A1 - Method and apparatus for controlling power of uplink reference signal in network cooperative communication - Google Patents

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure relates to the operation of a terminal and a base station in a wireless communication system and, specifically, relates to a method for transmitting and receiving an uplink reference signal in a wireless communication system, and an apparatus capable of performing same. The present disclosure provides an apparatus and a method capable of providing services effectively in a mobile communication system.

Description

Method and device for controlling power of uplink reference signal in network cooperative communication

This disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method for controlling the power of an uplink reference signal in network cooperative communication and a device capable of performing the same.

5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and includes sub-6 GHz ('Sub 6GHz') bands such as 3.5 gigahertz (3.5 GHz) as well as millimeter wave (mm) bands such as 28 GHz and 39 GHz. It is also possible to implement it in the ultra-high frequency band ('Above 6GHz') called Wave. In addition, in the case of 6G mobile communication technology, which is called the system of Beyond 5G, Terra is working to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low delay time that is reduced to one-tenth. Implementation in Terahertz bands (e.g., 95 GHz to 3 THz) is being considered.

In the early days of 5G mobile communication technology, there were concerns about ultra-wideband services (enhanced Mobile BroadBand, eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC). With the goal of satisfying service support and performance requirements, efficient use of ultra-high frequency resources, including beamforming and massive array multiple input/output (Massive MIMO) to alleviate radio wave path loss and increase radio wave transmission distance in ultra-high frequency bands. Various numerology support (multiple subcarrier interval operation, etc.) and dynamic operation of slot format, initial access technology to support multi-beam transmission and broadband, definition and operation of BWP (Band-Width Part), large capacity New channel coding methods such as LDPC (Low Density Parity Check) codes for data transmission and Polar Code for highly reliable transmission of control information, L2 pre-processing, and dedicated services specialized for specific services. Standardization of network slicing, etc., which provides networks, has been carried out.

Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology, considering the services that 5G mobile communication technology was intended to support, based on the vehicle's own location and status information. V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience, and NR-U (New Radio Unlicensed), which aims to operate a system that meets various regulatory requirements in unlicensed bands. ), NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with the terrestrial network is impossible, positioning, etc. Physical layer standardization for technology is in progress.

In addition, IAB (IAB) provides a node for expanding the network service area by integrating intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, and wireless backhaul links and access links. Integrated Access and Backhaul, Mobility Enhancement including Conditional Handover and DAPS (Dual Active Protocol Stack) handover, and 2-step Random Access (2-step RACH for simplification of random access procedures) Standardization in the field of wireless interface architecture/protocol for technologies such as NR) is also in progress, and 5G baseline for incorporating Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technology Standardization in the field of system architecture/services for architecture (e.g., Service based Architecture, Service based Interface) and Mobile Edge Computing (MEC), which provides services based on the location of the terminal, is also in progress.

When this 5G mobile communication system is commercialized, an explosive increase in connected devices will be connected to the communication network. Accordingly, it is expected that strengthening the functions and performance of the 5G mobile communication system and integrated operation of connected devices will be necessary. To this end, eXtended Reality (XR) and Artificial Intelligence to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR). , AI) and machine learning (ML), new research will be conducted on 5G performance improvement and complexity reduction, AI service support, metaverse service support, and drone communication.

In addition, the development of these 5G mobile communication systems includes new waveforms, full dimensional multiple input/output (FD-MIMO), and array antennas to ensure coverage in the terahertz band of 6G mobile communication technology. , multi-antenna transmission technology such as Large Scale Antenna, metamaterial-based lens and antenna to improve coverage of terahertz band signals, high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum), RIS ( In addition to Reconfigurable Intelligent Surface technology, Full Duplex technology, satellite, and AI (Artificial Intelligence) to improve the frequency efficiency of 6G mobile communication technology and system network are utilized from the design stage and end-to-end. -to-End) Development of AI-based communication technology that realizes system optimization by internalizing AI support functions, and next-generation distributed computing technology that realizes services of complexity beyond the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could be the basis for .

The disclosed embodiment seeks to provide an apparatus and method that can effectively provide services in a mobile communication system.

The present invention to solve the above problems is a method performed by a terminal of a wireless communication system, comprising: receiving sounding reference signal (SRS) configuration information supporting eight antenna ports from a base station; determining SRS transmission power based on the configuration information; And transmitting SRS using the eight antenna ports based on the SRS transmission power, wherein the SRS transmission power is calculated when the SRS of the eight antenna ports is transmitted in two consecutive symbols. It is determined by dividing the transmission power converted to a linear scale by the number of antenna ports set for each symbol.

In addition, a method performed by a base station of a wireless communication system includes the steps of transmitting sounding reference signal (SRS) configuration information supporting 8 antenna ports to a terminal; And receiving SRS using the eight antenna ports from the terminal, wherein the SRS transmission power is calculated as a linear scale of the calculated transmission power when the SRS of the eight antenna ports is transmitted in two consecutive symbols. It is characterized in that it is determined by dividing the converted value by the number of antenna ports set for each symbol.

Additionally, in a terminal of a wireless communication system, a transceiver unit; And receiving sounding reference signal (SRS) configuration information supporting 8 antenna ports from a base station, determining SRS transmission power based on the configuration information, and based on the SRS transmission power, the 8 and a control unit that controls SRS transmission using eight antenna ports, wherein the SRS transmission power is calculated by converting the calculated transmission power into a linear scale when the SRS of the eight antenna ports is transmitted in two consecutive symbols. It is characterized by being determined by dividing the value by the number of antenna ports set for each symbol.

Additionally, in a base station of a wireless communication system, a transceiver unit; And a control unit that transmits sounding reference signal (SRS) setting information supporting 8 antenna ports to the terminal and controls to receive SRS using the 8 antenna ports from the terminal, and transmits SRS The power is determined by dividing the calculated transmission power converted to a linear scale by the number of antenna ports set for each symbol when the SRS of the eight antenna ports is transmitted in two consecutive symbols.

The disclosed embodiment provides an apparatus and method that can effectively provide services in a mobile communication system.

Figure 1 is a diagram showing an example of the basic structure of the time-frequency domain in a wireless communication system.

FIG. 2 is a diagram illustrating an example of a frame, subframe, and slot structure in a wireless communication system.

Figure 3 is a diagram showing an example of bandwidth portion setting in a wireless communication system.

FIG. 4 is a diagram illustrating an example of control area settings of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.

FIG. 5 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.

FIG. 6 is a diagram illustrating an example of base station beam allocation according to TCI state settings in a wireless communication system.

FIG. 7 is a diagram illustrating an example of frequency axis resource allocation of PDSCH in a wireless communication system.

FIG. 8 is a diagram illustrating an example of PDSCH time axis resource allocation in a wireless communication system.

FIG. 9 is a diagram illustrating an example of time axis resource allocation according to subcarrier intervals of data channels and control channels in a wireless communication system.

Figure 10 is a diagram showing an example of a structure in which SRS is allocated for each subband.

FIG. 11 is a diagram illustrating an example of a terminal operation for SRS transmission according to an embodiment of the present disclosure.

FIG. 12 is a diagram illustrating an example of the operation of a base station for SRS reception according to an embodiment of the present disclosure.

FIG. 13 is a diagram illustrating an example of SRS reception power for each TRP according to the location of a terminal in network cooperative communication according to an embodiment of the present disclosure.

FIG. 14 is a diagram illustrating an example of SRS reception power for each TRP when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

FIG. 15 is a diagram illustrating another example of SRS reception power for each TRP when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

FIG. 16 is a diagram illustrating an example of a terminal operation when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

FIG. 17 is a diagram illustrating an example of the operation of a base station when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

FIG. 18 is a diagram illustrating an example of the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

FIG. 19 is a diagram illustrating an example of the 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 attached drawings.

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

For the same reason, some components are exaggerated, omitted, or schematically shown in the attached drawings. Additionally, the size of each component does not entirely reflect its actual size. In each drawing, identical or corresponding components are assigned the same reference numbers.

The advantages and features of the present disclosure and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms, and the present embodiments are merely intended to ensure that the disclosure is complete and are within the scope of common knowledge in the technical field to which the present disclosure pertains. It is provided to fully inform those who have the scope of the disclosure, and the disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. Additionally, when describing the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of the functions in the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, the base station is an entity that performs resource allocation for the terminal and may be at least one of gNode B, eNode B, Node B, BS (base station), wireless access unit, base station controller, or node on the network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, embodiments of the present disclosure can also be applied to other communication systems with similar technical background or channel types. For example, this may include the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A, and the term 5G hereinafter may also include the existing LTE, LTE-A, and other similar services. there is. In addition, this disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure at the discretion of a person with skilled technical knowledge.

At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagram diagrams can be performed by computer program instructions. These computer program instructions can be mounted on a processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, so that the instructions performed through the processor of the computer or other programmable data processing equipment are described in the flow chart block(s). It creates the means to perform functions. These computer program instructions may also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular manner, so that the computer-usable or computer-readable memory The instructions stored in may also produce manufactured items containing instruction means that perform the functions described in the flow diagram block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer, thereby generating a process that is executed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing the functions described in the flow diagram 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). Additionally, it should be noted that in some alternative execution examples it is possible for the functions mentioned in the blocks to occur out of order. For example, it is possible for two blocks shown in succession to be performed substantially simultaneously, or it is possible for the blocks to be performed in reverse order depending on the corresponding function.

At this time, the term '~unit' used in this embodiment refers to 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. The '~ part' may be configured to reside in an addressable storage medium and may be configured to reproduce on one or more processors. Therefore, as an example, '~ part' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, Includes subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or may be further separated into additional components and 'parts'. In addition, the components and 'parts' may be implemented to regenerate one or more CPUs within the device or secure multimedia card. Additionally, in an embodiment, '~ part' may include one or more processors.

Hereinafter, the description of A1/A2/A3.../An may be understood as a combination of at least one of A1 to An.

Wireless communication systems have moved away from providing early voice-oriented services to, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), and LTE-Advanced. Broadband wireless that provides high-speed, high-quality packet data services such as communication standards such as (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is evolving into a communication system.

As a representative example of the broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) method in the downlink (DL), and a single carrier frequency division multiplexing (SC-FDMA) method in the uplink (UL). access method is adopted. Uplink refers to a wireless link through which a terminal transmits data or control signals to a base station, and downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above multiple access method usually distinguishes each user's data or control information by allocating and operating the time-frequency resources to carry data or control information for each user so that they do not overlap, that is, orthogonality is established. You can.

As a future communication system after LTE, that is, the 5G communication system must be able to freely reflect the 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), and Ultra Reliability Low Latency Communication (URLLC). There is.

eMBB aims to provide more improved data transmission speeds than those supported by existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20Gbps in the downlink and 10Gbps in the uplink from the perspective of one base station. In addition, the 5G communication system must provide the maximum transmission rate and at the same time provide increased user perceived data rate. In order to meet these requirements, improvements in various transmission and reception technologies are required, including more advanced multi-antenna (multi input multi output, MIMO) transmission technology. In addition, while LTE transmits signals using a maximum of 20MHz transmission bandwidth in the 2GHz band, the 5G communication system uses a frequency bandwidth wider than 20MHz in the 3~6GHz or above 6GHz frequency band to transmit the data required by the 5G communication system. 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 5G communication systems. In order to efficiently provide the Internet of Things, mMTC requires support for access to a large number of terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal costs. Since the Internet of Things provides communication functions by attaching various sensors and various devices, it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. Additionally, due to the nature of the service, terminals supporting mMTC are likely to be located in shaded areas that cannot be covered by cells, such as the basement of a building, so they may require wider coverage than other services provided by the 5G communication system. Terminals that support mMTC must be composed of low-cost terminals, and since it is difficult to frequently replace the terminal's battery, a very long battery life time, such as 10 to 15 years, may be required.

Lastly, URLLC is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency situations. Services used for emergency alerts, etc. can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service that supports URLLC must satisfy an air interface latency of less than 0.5 milliseconds and has a packet error rate of less than 10 ^-5 . Therefore, for services supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time, it is a design that must allocate wide resources in the frequency band to ensure the reliability of the communication link. Specifications may be required.

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

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

Figure 1 is a diagram showing the basic structure of a time-frequency domain, which is a radio resource domain where data or control channels are transmitted.

The horizontal axis in Figure 1 represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE) 101, which can be defined as 1 OFDM symbol 102 on the time axis and 1 subcarrier (103) on the frequency axis. in the frequency domain

(For example, 12) consecutive REs may constitute one resource block (RB, 104).

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

Figure 2 shows an example of a frame 200, a subframe 201, and a slot 202 structure. 1 frame (200) can be defined as 10ms. 1 subframe 201 may be defined as 1 ms, and therefore 1 frame 200 may consist of a total of 10 subframes 201. 1 slot (202, 203) can be defined with 14 OFDM symbols (i.e., number of symbols per slot (

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

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

) may vary. According to each subcarrier spacing setting μ

and

Can be defined as Table 1 below.

μ
0	14	10	One
One	14	20	2
2	14	40	4
3	14	80	8
4	14	160	16
5	14	320	32

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

Figure 3 is a diagram showing an example of bandwidth portion setting in a wireless communication system.

Figure 3 shows an example in which the UE bandwidth (300) is set to two bandwidth parts, that is, bandwidth part #1 (BWP#1, 301) and bandwidth part #2 (BWP#2, 302). The base station can set one or more bandwidth parts to the terminal, and can set the following information for each bandwidth part.

BWP ::= SEQUENCE { bwp-Id BWP-Id, (Bandwidth part identifier) locationAndBandwidth INTEGER (1..65536); (Location of bandwidth part) subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5}, (subcarrier spacing) cyclicPrefix ENUMERATED { extended } (Cyclic transposition) }

Of course, it is not limited to the above example, and in addition to the setting information, various parameters related to the bandwidth can be set to the terminal. The above information can be delivered from the base station to the terminal through higher layer signaling, for example, radio resource control (RRC) signaling. Among one or a plurality of set bandwidth portions, at least one bandwidth portion may be activated. Whether to activate the set bandwidth portion can be semi-statically transmitted from the base station to the terminal through RRC signaling or dynamically transmitted through DCI (downlink control information).

According to some embodiments, the terminal before RRC connection may receive the initial bandwidth portion (initial BWP) for initial access from the base station through a master information block (MIB). More specifically, in the initial access stage, the terminal receives system information (which may correspond to remaining system information, RMSI or system information block 1, SIB1) required for initial access through the MIB of the physical broadcast channel (PBCH). Setting information about the control resource set (CORESET) and search space where the PDCCH for PDCCH can be transmitted can be received. The control area and search space set as MIB can each be regarded as identifier (ID) 0. The base station can notify the terminal of setting information such as frequency allocation information, time allocation information, and numerology for control area #0 through the MIB. Additionally, the base station can notify the terminal of configuration information about the monitoring period and occasion for control area #0, that is, configuration information about search space #0, through the MIB. The terminal may regard the frequency area set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access. At this time, the identifier (ID) of the initial bandwidth portion can be regarded as 0. Through the set initial bandwidth portion, the terminal can receive a physical downlink shared channel (PDSCH) through which the SIB is transmitted. In addition to receiving SIB, the initial bandwidth portion may be used for other system information (OSI), paging, and random access.

Next, the SS (synchronization signal)/PBCH block in the 5G system will be described.

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

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

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

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

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

The terminal can detect PSS and SSS in the initial access stage and decode the PBCH. The MIB can be obtained from the PBCH, and control area #0 (which may correspond to a control area with a control area index of 0) can be set from this. The terminal can perform monitoring on control area #0 assuming that the selected SS/PBCH block and the demodulation reference signal (DMRS) transmitted in control area #0 are QCL (quasi co location). The terminal can receive system information through downlink control information transmitted from control area #0. The terminal can obtain RACH (random access channel)-related configuration information necessary for initial access from the received system information. The terminal can transmit PRACH (physical RACH) to the base station in consideration of the SS/PBCH index selected, and the base station receiving the PRACH can obtain information about the SS/PBCH block index selected by the terminal. The base station can know which block the terminal has selected among each SS/PBCH block and monitor the control area #0 associated with it.

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

In the 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink data channel (PDSCH)) is delivered from the base station to the terminal through DCI. do. The terminal can monitor the DCI format for fallback and the DCI format for non-fallback for PUSCH or PDSCH. The preparedness DCI format may consist of fixed fields predefined between the base station and the terminal, and the non-contingent DCI format may include configurable fields.

DCI can be transmitted through PDCCH, a physical downlink control channel, through channel coding and modulation processes. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a radio network temporary identifier (RNTI) corresponding to the identity of the terminal. Different RNTIs may be used depending on the purpose of the DCI message, for example, UE-specific data transmission, power control command, or random access response. In other words, the RNTI is not transmitted explicitly but is transmitted included in the CRC calculation process. When receiving a DCI message transmitted on the PDCCH, the terminal checks the CRC using the allocated RNTI, and if the CRC check result is correct, the terminal can know that the message was sent to the terminal.

For example, DCI scheduling PDSCH for system information (SI) may be scrambled with SI-RNTI. The DCI that schedules the PDSCH for a random access response (RAR) message can be scrambled with RA-RNTI. DCI scheduling PDSCH for paging messages can be scrambled with P-RNTI. DCI notifying SFI (slot format indicator) can be scrambled with SFI-RNTI. DCI notifying transmit power control (TPC) can be scrambled with TPC-RNTI. The DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with a cell RNTI (C-RNTI).

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

- Identifier for DCI formats - [1] bit - Frequency domain resource assignment -[ ] bits - Time domain resource assignment - X bits - Frequency hopping flag - 1 bit. - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - TPC command for scheduled PUSCH (transmit power control command for scheduled PUSCH) - [2] bits - UL/SUL indicator (uplink/supplementary UL indicator) - 0 or 1 bit

DCI format 0_1 can be used as a fallback DCI for scheduling PUSCH, and at this time, CRC can be scrambled with C-RNTI. DCI format 0_1, in which the CRC is scrambled with C-RNTI, may include, for example, the information in Table 4 below.

- Carrier indicator - 0 or 3 bits - UL/SUL indicator - 0 or 1 bit - Identifier for DCI formats - [1] bits - Bandwidth part indicator - 0, 1 or 2 bits - Frequency domain resource assignment - For resource allocation type 0 (for resource allocation type 0), bits - For resource allocation type 1 (for resource allocation type 1), bits - Time domain resource assignment -1, 2, 3, or 4 bits - VRB-to-PRB mapping (virtual resource block-to-physical resource block mapping) - 0 or 1 bit, only for resource allocation type 1. ○ 0 bit if only resource allocation type 0 is configured; ○ 1 bit otherwise. - Frequency hopping flag - 0 or 1 bit, only for resource allocation type 1. ○ 0 bit if only resource allocation type 0 is configured; ○ 1 bit otherwise. - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - 1st downlink assignment index (1st downlink assignment index) - 1 or 2 bits ○ 1 bit for semi-static HARQ-ACK codebook (in case of semi-static HARQ-ACK codebook); ○ 2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook (when dynamic HARQ-ACK codebook is used with a single HARQ-ACK codebook). - 2nd downlink assignment index (2nd downlink assignment index) - 0 or 2 bits ○ 2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks (when a dynamic HARQ-ACK codebook is used with two HARQ-ACK sub-codebooks); ○ 0 bit otherwise. TPC command for scheduled PUSCH - 2 bits - SRS resource indicator (SRS resource indicator) - or bits ○ bits for non-codebook based PUSCH transmission (if PUSCH transmission is not codebook based); ○ bits for codebook based PUSCH transmission (if PUSCH transmission is codebook based). - Precoding information and number of layers - up to 6 bits - Antenna ports- up to 5 bits - SRS request- 2 bits - CSI request (channel status information request) - 0, 1, 2, 3, 4, 5, or 6 bits - CBG transmission information (code block group transmission information) - 0, 2, 4, 6, or 8 bits - PTRS-DMRS association (phase tracking reference signal-demodulation reference signal relationship) - 0 or 2 bits. - beta_offset indicator - 0 or 2 bits - DMRS sequence initialization (demodulation reference signal sequence initialization) - 0 or 1 bit

DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, and at this time, CRC can be scrambled with C-RNTI. DCI format 1_0, in which the CRC is scrambled with C-RNTI, may include, for example, the information in Table 5 below.

- Identifier for DCI formats - [1] bit - Frequency domain resource assignment -[ ] bits - Time domain resource assignment - X bits - VRB-to-PRB mapping - 1 bit. - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - Downlink assignment index - 2 bits - TPC command for scheduled PUCCH - [2] bits - PUCCH resource indicator (physical uplink control channel, PUCCH) resource indicator - 3 bits - PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ feedback timing indicator)- [3] bits

DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, and at this time, CRC can be scrambled with C-RNTI. DCI format 1_1, in which the CRC is scrambled with C-RNTI, may include, for example, the information in Table 6 below.

- Carrier indicator - 0 or 3 bits - Identifier for DCI formats - [1] bits - Bandwidth part indicator - 0, 1 or 2 bits - Frequency domain resource assignment ○ For resource allocation type 0, bits ○ For resource allocation type 1, bits - Time domain resource assignment -1, 2, 3, or 4 bits - VRB-to-PRB mapping - 0 or 1 bit, only for resource allocation type 1. ○ 0 bit if only resource allocation type 0 is configured; ○ 1 bit otherwise. - PRB bundling size indicator (physical resource block bundling size indicator) - 0 or 1 bit - Rate matching indicator - 0, 1, or 2 bits - ZP CSI-RS trigger (zero power channel status information reference signal trigger) - 0, 1, or 2 bits For transport block 1: - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits For transport block 2: - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - Downlink assignment index - 0 or 2 or 4 bits - TPC command for scheduled PUCCH - 2 bits - PUCCH resource indicator - 3 bits - PDSCH-to-HARQ_feedback timing indicator - 3 bits - Antenna ports - 4, 5 or 6 bits - Transmission configuration indication - 0 or 3 bits - SRS request - 2 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - CBG flushing out information (Code block group flushing out information) - 0 or 1 bit - DMRS sequence initialization - 1 bit

In the following, the downlink control channel in the 5G system will be described in more detail with reference to the drawings.

Figure 4 is a diagram showing an example of a control area where a downlink control channel is transmitted in a 5G communication system. Figure 4 shows the bandwidth part of the terminal (UE bandwidth part, 410) on the frequency axis and two control areas (control area #1 (401), control area #2 (402)) within one slot (420) on the time axis. An example is shown. The control areas 401 and 402 can be set to a specific frequency resource 403 within the entire terminal bandwidth portion 410 on the frequency axis. The control area can be set to one or multiple OFDM symbols on the time axis and can be defined as the control area length (control resource set duration, 404). Referring to the example shown in FIG. 4, control area #1 (401) is set to a control area length of 2 symbols, and control area #2 (402) is set to a control area length of 1 symbol.

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

ControlResourceSet ::= SEQUENCE { -- Corresponds to L1 parameter 'CORESET-ID' controlResourceSetId ControlResourceSetId, (Control area identifier (Identity)) frequencyDomainResources BIT STRING (SIZE (45)); (Frequency axis resource allocation information) duration INTEGER (1..maxCoReSetDuration), (Time axis resource allocation information) cce-REG-MappingType CHOICE { (CCE-to-REG mapping method) interleaved SEQUENCE { reg-BundleSize ENUMERATED {n2, n3, n6}, (REG bundle size) precoderGranularity ENUMERATED {sameAsREG-bundle, allContiguousRBs}, interleaverSize ENUMERATED {n2, n3, n6} (Interleaver size) shiftIndex INTEGER(0..maxNrofPhysicalResourceBlocks-1) OPTIONAL (Interleaver Shift) }, nonInterleaved NULL }, tci-StatesPDCCH SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF TCI-StateId OPTIONAL, (QCL settings information) tci-PresentInDCI ENUMERATED {enabled} OPTIONAL, -- Need S }

In Table 7, the tci-StatesPDCCH (simply named TCI (transmission configuration indication) state) configuration information is DMRS and QCL| transmitted in the corresponding control area. It may include information of one or more SS/PBCH block indexes or CSI-RS (channel state information reference signal) indexes in a relationship.

Figure 5 is a diagram showing an example of the basic units of time and frequency resources constituting a downlink control channel. According to Figure 5, the basic unit of time and frequency resources constituting the control channel can be called REG (resource element group, 503), and REG (503) is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis. (physical resource block, 502), that is, it can be defined as 12 subcarriers. The base station can configure a downlink control channel allocation unit by concatenating REGs 503.

As shown in FIG. 5, if the basic unit to which a downlink control channel is allocated in 5G is called a control channel element (CCE) 504, 1 CCE 504 may be composed of a plurality of REGs 503. Taking REG 503 shown in FIG. 5 as an example, REG 503 may be composed of 12 REs, and if 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 may consist of 72 REs. When a downlink control area is set, the area can be composed of a plurality of CCEs (504), and a specific downlink control channel is composed of one or multiple CCEs (504) depending on the aggregation level (AL) within the control area. It can be mapped and transmitted. CCEs 504 in the control area are classified by numbers, and at this time, the numbers of CCEs 504 can be assigned according to a logical mapping method.

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

Search space can be classified into common search space and UE-specific search space. A certain group of UEs or all UEs can search the common search space of the PDCCH to receive cell common control information such as dynamic scheduling or paging messages for system information. For example, PDSCH scheduling allocation information for SIB transmission, including cell operator information, etc., can be received by examining the common search space of the PDCCH. In the case of a common search space, a certain group of UEs or all UEs must receive the PDCCH, so it can be defined as a set of pre-arranged CCEs. Scheduling allocation information for a UE-specific PDSCH or PUSCH can be received by examining the UE-specific search space of the PDCCH. The terminal-specific search space can be terminal-specifically defined as a function of the terminal's identity and various system parameters.

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

SearchSpace ::= SEQUENCE { -- Identity of the search space. SearchSpaceId = 0 identifies the SearchSpace configured via PBCH (MIB) or ServingCellConfigCommon. searchSpaceId SearchSpaceId, (search space identifier) controlResourceSetId ControlResourceSetId, (Control area identifier) monitoringSlotPeriodicityAndOffset CHOICE { (Monitoring slot level cycle) sl1 NULL; sl2 INTEGER (0..1); sl4 INTEGER (0..3); sl5 INTEGER (0..4); sl8 INTEGER (0..7); sl10 INTEGER (0..9); sl16 INTEGER (0..15); sl20 INTEGER (0..19) } OPTIONAL; duration (monitoring length) INTEGER (2..2559) monitoringSymbolsWithinSlot BIT STRING (SIZE (14)) OPTIONAL, (Monitoring symbol in slot) nrofCandidates SEQUENCE { (Number of PDCCH candidates by aggregation level) aggregationLevel1 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel2 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel4 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel8 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel16 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8} }, searchSpaceType CHOICE { (Search space type) -- Configures this search space as common search space (CSS) and DCI formats to monitor. common SEQUENCE { (common navigation space) } ue-Specific SEQUENCE { (Terminal-specific search space) -- Indicates whether the UE monitors in this USS for DCI formats 0-0 and 1-0 or for formats 0-1 and 1-1. formats ENUMERATED {formats0-0-And-1-0, formats0-1-And-1-1}, ... }

Depending on the configuration information, the base station can configure one or more search space sets for the terminal. According to some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure DCI format A scrambled with X-RNTI in search space set 1 to be monitored in the common search space, and search space set 1 may be set to monitor In space set 2, DCI format B scrambled with Y-RNTI can be set to be monitored in the terminal-specific search space.

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

In the common search space, the combination of the following DCI format and RNTI can be monitored. Of course, this is not limited to the examples below.

- 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 terminal-specific search space, the combination of the following DCI format and RNTI can be monitored. Of course, this is not limited to the examples below.

- 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): For UE-specific PDSCH scheduling purposes

TC-RNTI (temporary Cell RNTI): For UE-specific PDSCH scheduling purposes

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

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

P-RNTI (paging RNTI): For PDSCH scheduling purposes where paging is transmitted

SI-RNTI (system information RNTI): PDSCH scheduling purpose where system information is transmitted

INT-RNTI (interruption RNTI): Used to inform whether or not the PDSCH is pucturing.

TPC-PUSCH-RNTI (transmit power control for PUSCH RNTI): Used to indicate power control commands to PUSCH

TPC-PUCCH-RNTI (transmit power control for PUCCH RNTI): Used to indicate power control commands to PUCCH

TPC-SRS-RNTI (transmit power control for SRS RNTI): Used to indicate power control commands to SRS

The DCI formats specified above may follow the definitions below.

DCI format	Usage
0_0	Scheduling of PUSCH in one cell
0_1	Scheduling of PUSCH in one cell
1_0	Scheduling of PDSCH in one cell
1_1	Scheduling of PDSCH in one cell
2_0	Notifying a group of UEs of the slot format
2_1	Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE
2_2	Transmission of TPC commands for PUCCH and PUSCH
2_3	Transmission of a group of TPC commands for SRS transmissions by one or more UEs

In the 5G system, the search space of the aggregation level L in CORESET p and search space set s can be expressed as Equation 1 below.

[Equation 1]

- L: Aggregation level

- n _CI : Carrier index

- n _CCE,p : Total number of CCEs present in CORESET p

-

: slot index

-

: Number of PDCCH candidates at aggregation level L

-

= 0, ...,

-1: PDCCH candidate index of aggregation level L

- l = 0, ..., L -1

-

, Y _p,-1 = nRNTI≠0, A _p = 39827 for p mod 3 = 0, A _p = 39829 for p mod 3 = 1, A _p = 39839 for p mod 3 = 2, D= 65537

- n _RNTI : Terminal identifier

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

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

In the 5G system, as a plurality of search space sets may be set with different parameters (e.g., parameters in Table 9), the set of search space sets monitored by the terminal at each time point may vary. For example, if search space set #1 is set to an X-slot period, search space set #2 is set to a Y-slot period, and Both space set #2 can be monitored, and in a specific slot, either search space set #1 or search space set #2 can be monitored.

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 future description of the present disclosure, they will be collectively referred to as different antenna ports for convenience) They can be associated with each other by QCL settings as shown in Table 10 below. The TCI state is to announce the QCL relationship between PDCCH (or PDCCH DMRS) and other RS or channels, and the QCL relationship between a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) QCLed means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at antenna port A to channel measurement from 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 associate different parameters. Accordingly, NR supports four types of QCL relationships as shown in Table 10 below.

QCL type	Large-scale characteristics
A	Doppler shift, Doppler spread, average delay, delay spread
B	Doppler shift, Doppler spread
C	Doppler shift, average delay
D	Spatial Rx parameters

The spatial RX parameter is 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 can be collectively referred to.

The QCL relationship can be set to the terminal through the RRC parameters TCI-State and QCL-Info as shown in Table 11 below. Referring to Table 11, the base station can set one or more TCI states to the UE and inform the UE of up to two QCL relationships (qcl-Type1, qcl-Type2) for 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 corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 10 above. do.

TCI-State ::= SEQUENCE { tci-StateId TCI-StateId, (ID of the corresponding TCI state) qcl-Type1 QCL-Info, (QCL information of the first reference RS of the RS (target RS) referring to the corresponding TCI state ID) qcl-Type2 QCL-Info OPTIONAL, -- Need R (QCL information of the second reference RS of the RS (target RS) referring to the corresponding TCI state ID) ... } QCL-Info ::= SEQUENCE { cell ServCellIndex OPTIONAL, -- Need R (Serving cell index of reference RS indicated by the relevant QCL information) bwp-Id BWP-Id OPTIONAL, -- Cond CSI-RS-Indicated (BWP index of reference RS indicated by the relevant QCL information) referenceSignal CHOICE { csi-rs NZP-CSI-RS-ResourceId, ssb SSB-Index (Either CSI-RS ID or SSB ID indicated by the corresponding QCL information) }, qcl-Type ENUMERATED {typeA, typeB, typeC, typeD}, ... }

Figure 6 is a diagram showing an example of base station beam allocation according to TCI state settings. Referring to FIG. 6, the base station can transmit information about N different beams to the terminal through N different TCI states. For example, when N = 3 as shown in Figure 6, the base station is associated with CSI-RS or SSB corresponding to beams with different qcl-Type2 parameters included in the three TCI states (600, 605, 610), and QCL type D By setting it to , it can be announced that the antenna ports referring to the different TCI states 600, 605, or 610 are associated with different spatial Rx parameters, that is, different beams.

FIG. 7 is a diagram illustrating an example of frequency axis resource allocation of PDSCH in a wireless communication system.

FIG. 7 is a diagram illustrating three frequency axis resource allocation methods: type 0 (700), type 1 (705), and dynamic switch (710) that can be set through the upper layer.

Referring to FIG. 7, if the terminal is set to use only resource type 0 through higher layer signaling (700), some downlink control information that allocates a PDSCH to the terminal includes a bitmap consisting of N _RBG bits. . The conditions for this will be explained later. At this time, N _RBG means the number of RBGs (resource block group) determined as shown in Table 12 below according to the BWP size assigned by the BWP indicator and the upper layer parameter rbg-Size, and is 1 by the bitmap. Data is transmitted to the RBG indicated by .

Bandwidth Part Size		Configuration 1	Configuration 2
1-36	2	4
37-72	4	8
73-144	8	16
145-275	16	16

If the terminal is set to use only resource type 1 through upper layer signaling (705), some DCIs that allocate PDSCH to the terminal are

Contains frequency axis resource allocation information consisting of bits. The conditions for this will be explained later. Through this, the base station can set the starting VRB (720) and the length (725) of the frequency axis resources continuously allocated therefrom.

If the terminal is set to use both resource type 0 and resource type 1 through upper layer signaling (710), some DCIs that allocate PDSCH to the terminal include payload (715) to set resource type 0 and resource type 1. Includes frequency axis resource allocation information consisting of bits with the largest value (735) among payloads (720, 725) for setting. The conditions for this will be explained later. At this time, one bit may be added to the first part (MSB) of the frequency axis resource allocation information in the DCI, and if the bit has a value of '0', it indicates that resource type 0 is used, and if the value of '1' is '1', the resource It may be indicated that type 1 is used.

Below, the time domain resource allocation method for data channels in the 5G system is described.

The base station may set a table for time domain resource allocation information for the downlink data channel and uplink data channel to the terminal using higher layer signaling (eg, RRC signaling). For PDSCH, a table consisting of up to maxNrofDL-Allocations=16 entries can be set, and for PUSCH, a table consisting of up to maxNrofUL-Allocations=16 entries can be set up. In one embodiment, the time domain resource allocation information includes the PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) ), PDCCH-to-PUSCH slot timing (corresponds to the time interval in slot units between the time when PDCCH is received and the time when PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), PDSCH or PUSCH within the slot Information on the location and length of the scheduled start symbol, mapping type of PDSCH or PUSCH, etc. may be included. For example, information such as Table 13 or Table 14 below may be transmitted from the base station to the terminal.

PDSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofDL-Allocations)) OF PDSCH-TimeDomainResourceAllocation PDSCH-TimeDomainResourceAllocation ::= SEQUENCE { k0 INTEGER(0..32) OPTIONAL, -- Need S (PDCCH-to-PDSCH timing, slot unit) mappingType ENUMERATED {typeA, typeB}, (PDSCH mapping type) startSymbolAndLength INTEGER (0..127) (Start symbol and length of PDSCH) }

PUSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofUL-Allocations)) OF PUSCH-TimeDomainResourceAllocation PUSCH-TimeDomainResourceAllocation ::= SEQUENCE { k2 INTEGER(0..32) OPTIONAL, -- Need S (PDCCH-to-PUSCH timing, slot-wise) mappingType ENUMERATED {typeA, typeB}, (PUSCH mapping type) startSymbolAndLength INTEGER (0..127) (Start symbol and length of PUSCH) }

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

FIG. 8 is a diagram illustrating an example of PDSCH time axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.

Referring to Figure 8, the base station subcarrier spacing (SCS, μ _PDSCH , μ _PDCCH ) and scheduling offset of the data channel and control channel set using the upper layer. )(K0) value, and the time axis position of the PDSCH resource can be indicated according to the OFDM symbol start position (800) and length (805) within one slot that are dynamically indicated through DCI.

FIG. 9 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.

Referring to FIG. 9, when the subcarrier spacing of the data channel and the control channel is the same (900, μ _PDSCH = μ _PDCCH ), the slot numbers for data and control are the same, so the base station and the terminal use predetermined slots. A scheduling offset can be created according to the slot offset K0. On the other hand, when the subcarrier spacing of the data channel and the control channel are different (905, μ _PDSCH ≠μ _PDCCH ), the slot numbers for data and control are different, so the base station and the terminal use the subcarrier spacing of the PDCCH as the basis. In this way, a scheduling offset can be generated according to the predetermined slot offset K0 and the subcarrier interval of the data channel and control channel.

Next, the scheduling method of PUSCH transmission will be described. PUSCH transmission can be dynamically scheduled by the UL grant in DCI or 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.

Configured grant Type 1 PUSCH transmission can be set semi-statically through reception of configuredGrantConfig including rrc-ConfiguredUplinkGrant of Table 15 through higher-order signaling without receiving the UL grant in DCI. Configured grant Type 2 PUSCH transmission can be semi-persistently scheduled by the UL grant in the DCI after receiving configuredGrantConfig that does not include rrc-ConfiguredUplinkGrant of Table 15 through higher-order signaling. When PUSCH transmission operates by a configured grant, the parameters applied to PUSCH transmission are those in Table 15, except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by pusch-Config in Table 16, which is the upper signaling. It is applied through configuredGrantConfig, which is higher-level signaling. If the terminal is provided with transformPrecoder in configuredGrantConfig, which is the higher-order signaling in Table 15, the terminal applies tp-pi2BPSK in pusch-Config in Table 16 to PUSCH transmission operated by the configured grant.

ConfiguredGrantConfig ::= SEQUENCE { frequencyHopping ENUMERATED {intraSlot, interSlot} OPTIONAL, -- Need S, cg-DMRS-Configuration DMRS-UplinkConfig, mcs-Table ENUMERATED {qam256, qam64LowSE} OPTIONAL, -- Need S mcs-TableTransformPrecoder ENUMERATED {qam256, qam64LowSE} OPTIONAL, -- Need S uci-OnPUSCH SetupRelease { CG-UCI-OnPUSCH } OPTIONAL, -- Need M resourceAllocation ENUMERATED { resourceAllocationType0, resourceAllocationType1, dynamicSwitch }, rbg-Size ENUMERATED {config2} OPTIONAL, -- Need S powerControlLoopToUse ENUMERATED {n0, n1}, p0-PUSCH-Alpha P0-PUSCH-AlphaSetId, transformPrecoder ENUMERATED {enabled, disabled} OPTIONAL, -- Need S nrofHARQ-Processes INTEGER(1..16); repK ENUMERATED {n1, n2, n4, n8}, repK-RV ENUMERATED {s1-0231, s2-0303, s3-0000} OPTIONAL, -- Need R periodicity ENUMERATED { sym2, sym7, sym1x14, sym2x14, sym4x14, sym5x14, sym8x14, sym10x14, sym16x14, sym20x14, sym32x14, sym40x14, sym64x14, sym80x14, sym128x14, sym160x14, sym256x14, sym320x14, sym512x14, sym640x14, sym1024x14, sym1280x14, sym2560x14, sym5120x14, sym6, sym1x12, sym2x12, sym4x12, sym5x12, sym8x12, sym10x12, sym16x12, sym20x12, sym32x12, sym40x12, sym64x12, sym80x12, sym128x12, sym160x12, sym256x12, sym320x12, sym512x12, sym640x12, sym1280x12, sym2560x12 }, configuredGrantTimer INTEGER (1..64) OPTIONAL, -- Need R rrc-ConfiguredUplinkGrant SEQUENCE { timeDomainOffset INTEGER (0..5119); timeDomainAllocation INTEGER (0..15); frequencyDomainAllocation BIT STRING (SIZE(18)); antennaPort INTEGER (0..31); dmrs-SeqInitialization INTEGER (0..1) OPTIONAL, -- Need R precodingAndNumberOfLayers INTEGER(0..63); srs-ResourceIndicator INTEGER (0..15) OPTIONAL, -- Need R mcsAndTBS INTEGER (0..31); frequencyHoppingOffset INTEGER (1.. maxNrofPhysicalResourceBlocks-1) OPTIONAL, -- Need R pathlossReferenceIndex INTEGER (0..maxNrofPUSCH-PathlossReferenceRSs-1); ... } OPTIONAL, -- Need R ... }

Next, the 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 can follow a codebook-based transmission method and a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in pusch-Config in Table 16, which is higher-level signaling, is 'codebook' or 'nonCodebook'.

As described above, PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can be set semi-statically by a configured grant. If the UE is instructed to schedule PUSCH transmission through DCI format 0_0, the UE transmits PUSCH using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the activated uplink BWP within the serving cell. Beam setup for transmission is performed, and at this time, PUSCH transmission is based on a single antenna port. The terminal does not expect scheduling for PUSCH transmission through DCI format 0_0 within a BWP in which a PUCCH resource including pucch-spatialRelationInfo is not set. If the terminal has not set txConfig in pusch-Config in Table 16, the terminal does not expect to be scheduled in DCI format 0_1.

PUSCH-Config ::= SEQUENCE { dataScramblingIdentityPUSCH INTEGER (0..1023) OPTIONAL, -- Need S txConfig ENUMERATED {codebook, nonCodebook} OPTIONAL, -- Need S dmrs-UplinkForPUSCH-MappingTypeA SetupRelease { DMRS-UplinkConfig } OPTIONAL, -- Need M dmrs-UplinkForPUSCH-MappingTypeB SetupRelease { DMRS-UplinkConfig } OPTIONAL, -- Need M pusch-PowerControl PUSCH-PowerControl OPTIONAL, -- Need M frequencyHopping ENUMERATED {intraSlot, interSlot} OPTIONAL, -- Need S frequencyHoppingOffsetLists SEQUENCE (SIZE (1..4)) OF INTEGER (1.. maxNrofPhysicalResourceBlocks-1) OPTIONAL, --Need M resourceAllocation ENUMERATED { resourceAllocationType0, resourceAllocationType1, dynamicSwitch}, pusch-TimeDomainAllocationList SetupRelease { PUSCH-TimeDomainResourceAllocationList } OPTIONAL, -- Need M pusch-AggregationFactor ENUMERATED { n2, n4, n8 } OPTIONAL, -- Need S mcs-Table ENUMERATED {qam256, qam64LowSE} OPTIONAL, -- Need S mcs-TableTransformPrecoder ENUMERATED {qam256, qam64LowSE} OPTIONAL, -- Need S transformPrecoder ENUMERATED {enabled, disabled} OPTIONAL, -- Need S codebookSubset ENUMERATED {fullyAndPartialAndNonCoherent, partialAndNonCoherent,nonCoherent} OPTIONAL, --Cond codebookBased maxRank INTEGER (1..4) OPTIONAL, -- Cond codebookBased rbg-Size ENUMERATED { config2} OPTIONAL, -- Need S uci-OnPUSCH SetupRelease { UCI-OnPUSCH} OPTIONAL, -- Need M tp-pi2BPSK ENUMERATED {enabled} OPTIONAL, -- Need S ... }

Next, codebook-based PUSCH transmission is explained. Codebook-based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1 and can operate semi-statically by configured grant. When the codebook-based PUSCH is scheduled dynamically by DCI format 0_1 or set semi-statically by a configured grant, the terminal uses SRS (sounding reference signal) resource indicator (SRI), transmission precoding matrix indicator (TPMI), and transmission rank. The precoder for PUSCH transmission is determined based on (the number of PUSCH transmission layers).

At this time, SRI can be given through a field SRS resource indicator in DCI or set through srs-ResourceIndicator, which is higher-level signaling. The terminal receives at least one SRS resource when transmitting a codebook-based PUSCH, and can receive up to two settings. When a terminal receives an SRI through DCI, the SRS resource indicated by the SRI means an SRS resource corresponding to the SRI among SRS resources transmitted before the PDCCH containing the SRI. Additionally, TPMI and transmission rank can be given through the field precoding information and number of layers in DCI, or can be set through precodingAndNumberOfLayers, which is higher-level signaling. TPMI is used to indicate the precoder applied to PUSCH transmission. If the terminal receives one SRS resource configured, TPMI is used to indicate the precoder to be applied in one configured SRS resource. If the terminal receives multiple SRS resources, TPMI is used to indicate the precoder to be applied in the SRS resource indicated through SRI.

The precoder to be used for PUSCH transmission is selected from the uplink codebook with the number of antenna ports equal to the nrofSRS-Ports value in SRS-Config, which is upper signaling. In codebook-based PUSCH transmission, the UE determines the codebook subset based on TPMI and codebookSubset in pusch-Config, which is higher-level signaling. The codebookSubset in pusch-Config, which is the upper signaling, can 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 a UE capability, the UE does not expect the value of codebookSubset, which is higher level signaling, to be set to 'fullyAndPartialAndNonCoherent'. Additionally, if the UE reports 'nonCoherent' as a UE capability, the UE does not expect the value of codebookSubset, which is higher level signaling, to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports in SRS-ResourceSet, which is upper signaling, indicates two SRS antenna ports, the terminal does not expect the value of codebookSubset, which is upper signaling, to be set to 'partialAndNonCoherent'.

The terminal can receive one SRS resource set in which the usage value in the upper-level signaling SRS-ResourceSet is set to 'codebook', and one SRS resource within the corresponding SRS resource set can be indicated through SRI. If multiple SRS resources are set in an SRS resource set where the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal sets the value of nrofSRS-Ports in the higher signaling SRS-Resource to the same value for all SRS resources. I look forward to seeing this set up.

The terminal transmits one or more SRS resources included in the SRS resource set with the usage value 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 sends the corresponding SRS Instructs the terminal to perform PUSCH transmission using the transmission beam information of the resource. At this time, in codebook-based PUSCH transmission, SRI is used as information to select the index of one SRS resource and is included in DCI. Additionally, the base station includes information indicating the TPMI and rank that the terminal will use for PUSCH transmission in the DCI. The terminal uses the SRS resource indicated by the SRI and performs PUSCH transmission by applying the rank indicated and the precoder indicated by TPMI based on the transmission beam of the SRS resource.

Next, non-codebook-based PUSCH transmission is explained. Non-codebook-based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1 and can operate semi-statically by configured grant. If at least one SRS resource is set in the SRS resource set where the usage value in the higher-level signaling SRS-ResourceSet is set to 'nonCodebook', the terminal can receive non-codebook-based PUSCH transmission scheduled through DCI format 0_1.

For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the terminal can receive one connected NZP CSI-RS resource (non-zero power CSI-RS). The terminal can perform calculations on the precoder for SRS transmission through measurement of 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 the aperiodic SRS transmission from the terminal is less than 42 symbols, the terminal updates information about the precoder for SRS transmission. don't expect it to happen

If the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the connected NZP CSI-RS is indicated by SRS request, 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, a connected NZP CSI-RS exists if the value of the field SRS request in DCI format 0_1 or 1_1 is not '00'. It indicates that At this time, the relevant DCI must not indicate cross carrier or cross BWP scheduling. Additionally, if the value of the SRS request indicates the existence of NZP CSI-RS, the NZP CSI-RS is located in the slot in which the PDCCH including the SRS request field was transmitted. At this time, the TCI states set in the scheduled subcarrier are not set to QCL-TypeD.

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

When a terminal receives a plurality of SRS resources, it can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. At this time, SRI can be indicated through a field SRS resource indicator in DCI or set through srs-ResourceIndicator, which is higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the terminal receives an SRI through DCI, the SRS resource indicated by the SRI is an SRS resource corresponding to the SRI among the SRS resourcs transmitted before the PDCCH containing the SRI. it means. The terminal can use one or multiple SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the terminal to the base station. It is decided. At this time, SRS resources simultaneously transmitted by the terminal occupy the same RB. The terminal sets one SRS port for each SRS resource. Only one SRS resource set with the usage value in the upper-level signaling SRS-ResourceSet 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 transmits one or more SRS resources in the corresponding SRS resource set based on the results measured when receiving the corresponding NZP-CSI-RS. Calculate the precoder to use when transmitting. The terminal applies the calculated precoder when transmitting one or more SRS resources in the SRS resource set whose usage is set to 'nonCodebook' to the base station, and the base station transmits one or more SRS resources among the one or more SRS resources received. Select SRS resource. At this time, in non-codebook-based PUSCH transmission, SRI represents an index that can express a combination of one or multiple SRS resources, and the SRI is included in DCI. At this time, the number of SRS resources indicated by the SRI transmitted by the base station can be the number of transmission layers of the PUSCH, and the terminal transmits the PUSCH by applying the precoder applied to SRS resource transmission to each layer.

In LTE and NR, the terminal can perform a procedure to report the capabilities (or can be used interchangeably with capabilities) 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 (UE capability inquiry) message 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 information on combinations of supported frequency bands, etc. Additionally, in the case of the UE capability inquiry message, UE capabilities for each RAT type may be requested through one RRC message container transmitted by the base station, or the base station may send a UE capability inquiry message including a UE capability request for each RAT type. It can be included multiple times and delivered to the terminal. That is, the UE capability inquiry is repeated multiple times within one message, and the UE can construct a corresponding UE capability information message and report it multiple times. In the next-generation mobile communication system, terminal capability requests can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity). In addition, the terminal capability inquiry message is generally transmitted initially after the terminal is connected to the base station, but the base station can request it under any conditions when necessary.

In the above step, the terminal that has received a 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 is a summary of how the terminal configures UE capabilities in the NR system.

1. If the terminal receives a list of LTE and/or NR bands through a UE capability request from the base station, the terminal configures a band combination (BC) for EN-DC and NR stand alone (SA). In other words, a BC candidate list for EN-DC and NR SA is constructed based on the bands requested from the base station through FreqBandList. Additionally, the bands are prioritized in the order listed in FreqBandList.

2. If the base station requests UE capability reporting by setting the “eutra-nr-only” flag or “eutra” flag, the UE completely removes NR SA BCs from the candidate list of configured BCs. This operation can only occur if the LTE base station (eNB) requests “eutra” capability.

3. Afterwards, the terminal removes fallback BCs from the candidate list of BCs constructed in the above step. Here, fallback BC means BC that can be obtained by removing the band corresponding to at least one SCell from any BC, because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. It can be omitted. This step also applies to MR-DC, i.e. LTE bands as well. The BCs remaining after this step are the final “candidate BC list”.

4. The terminal selects BCs to report by selecting BCs that fit the requested RAT type from the final “candidate BC list” above. In this step, the terminal configures the supportedBandCombinationList in a given order. In other words, the terminal configures the BC and UE capabilities to be reported in accordance with the order of the preset rat-Type. (nr -> eutra-nr -> eutra). Additionally, a featureSetCombination is constructed for the configured supportedBandCombinationList, and a list of "candidate feature set combinations" is constructed from the candidate BC list from which the list of fallback BCs (containing capabilities of the same or lower level) is removed. The above “candidate feature set combination” includes both feature set combinations for NR and EUTRA-NR BC, and can be obtained from the feature set combination of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

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

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

Next, an uplink channel estimation method using the terminal's SRS transmission is described. The base station can set at least one SRS configuration for each uplink BWP to deliver configuration information for SRS transmission to the terminal, and can also set at least one SRS resource set for each SRS configuration. For example, the base station and the terminal can exchange high-level signaling information as follows to deliver information about the SRS resource set.

- srs-ResourceSetId: SRS resource set index

- srs-ResourceIdList: A set of SRS resource indexes referenced in the SRS resource set.

- resourceType: Time axis transmission setting of the SRS resource referenced in the SRS resource set, and can be set to one of 'periodic', 'semi-persistent', or 'aperiodic'. If set to 'periodic' or 'semi-persistent', associated CSI-RS information may be provided depending on the use of the SRS resource set. If set to 'aperiodic', aperiodic SRS resource trigger list and slot offset information may be provided, and associated CSI-RS information may be provided depending on the use of the SRS resource set.

- usage: Setting for the usage of the SRS resource referenced in the SRS resource set, can be set to one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

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

The terminal can understand that the SRS resource included in the set of SRS resource indexes referenced in the SRS resource set follows the information set in the SRS resource set.

Additionally, the base station and the terminal can transmit and receive upper layer signaling information to deliver individual configuration information for SRS resources. For example, individual setting 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. . Additionally, individual setting information for the SRS resource may include time axis transmission settings for the SRS resource and may be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This may be limited to having the same time axis transmission settings as the SRS resource set containing the SRS resource. If the time axis transmission settings of the SRS resource are set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (for example, periodicityAndOffset) may be additionally included in the time axis transmission settings.

The base station may activate, deactivate, or trigger SRS transmission to the UE through higher layer signaling including RRC signaling or MAC CE signaling, or L1 signaling (e.g., DCI). For example, the base station can activate or deactivate periodic SRS transmission through upper layer signaling to the terminal. The base station can instruct to activate an SRS resource set whose resourceType is set to periodic through higher layer signaling, and the terminal can transmit the SRS resource referenced in the activated SRS resource set. The time-frequency axis resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource, and the slot mapping including the transmission period and slot offset follows periodicityAndOffset set in the SRS resource. Additionally, the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation info set in the SRS resource, or may refer to the associated CSI-RS information set in the SRS resource set containing the SRS resource. The terminal can transmit SRS resources within the activated uplink BWP for periodic SRS resources activated through higher layer signaling.

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

For example, the base station can trigger aperiodic SRS transmission to the terminal through DCI. The base station may indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) through the SRS request field of DCI. The terminal may understand that, among the configuration information of the SRS resource set, the SRS resource set including the aperiodic SRS resource trigger indicated through DCI in the aperiodic SRS resource trigger list has been triggered. The terminal can transmit the SRS resource referenced in the triggered SRS resource set. The time-frequency axis resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource. Additionally, the slot mapping of the transmitted SRS resource can be determined through the slot offset between the PDCCH including DCI and the SRS resource, which can 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 the DCI and the SRS resource may apply the value indicated in the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set set in the SRS resource set. Additionally, the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation info set in the SRS resource, or may refer to the associated CSI-RS information set in the SRS resource set containing the SRS resource. The terminal can transmit an SRS resource within the activated uplink BWP for 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 configuration information for the SRS resource, the minimum distance between the PDCCH containing the DCI that triggers aperiodic SRS transmission and the transmitted SRS A minimum time interval may be required. The time interval for the UE's SRS transmission can be defined as the number of symbols between the last symbol of the PDCCH containing the DCI that triggers aperiodic SRS transmission and the first symbol to which the earliest transmitted SRS resource is mapped among the transmitted SRS resource(s). You can. The minimum time interval can be determined by referring to the PUSCH preparation procedure time required for the UE to prepare for PUSCH transmission. Additionally, the minimum time interval may have different values depending on the use of the SRS resource set including the transmitted SRS resource. For example, the minimum time interval may be set to the N2 symbol defined by considering the terminal processing capability according to the terminal's capabilities with reference to the terminal's PUSCH preparation procedure time. In addition, considering 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 symbol, and the usage of the SRS resource set is 'nonCodebook' Alternatively, if set to 'beamManagement', the minimum time interval can be set to N2+14 symbols. The UE transmits aperiodic SRS when the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and ignores the DCI triggering aperiodic SRS when the time interval for aperiodic SRS transmission is less than the minimum time interval. You can.

SRS-Resource ::= SEQUENCE { srs-ResourceId SRS-ResourceId, nrofSRS-Ports ENUMERATED {port1, ports2, ports4}, ptrs-PortIndex ENUMERATED {n0, n1 } OPTIONAL, -- Need R transmissionComb CHOICE { n2 SEQUENCE { combOffset-n2 INTEGER (0..1); cyclicShift-n2 INTEGER (0..7) }, n4 SEQUENCE { combOffset-n4 INTEGER (0..3); cyclicShift-n4 INTEGER (0..11) } }, resourceMapping SEQUENCE { startPosition INTEGER (0..5); nrofSymbols ENUMERATED {n1, n2, n4}, repetitionFactor ENUMERATED {n1, n2, n4} }, freqDomainPosition INTEGER (0..67); freqDomainShift INTEGER(0..268); freqHopping SEQUENCE { c-SRS INTEGER (0..63); b-SRS INTEGER (0..3); b-hop INTEGER (0..3) }, groupOrSequenceHopping ENUMERATED { neither, groupHopping, sequenceHopping }, resourceType CHOICE { aperiodic SEQUENCE { ... }, semi-persistent SEQUENCE { periodicityAndOffset-sp SRS-PeriodicityAndOffset; ... }, periodic SEQUENCE { periodicityAndOffset-pSRS-PeriodicityAndOffset; ... } }, sequenceId INTEGER (0..1023); spatialRelationInfo SRS-SpatialRelationInfo OPTIONAL, -- Need R ..., [[ resourceMapping-r16 SEQUENCE { startPosition-r16 INTEGER (0..13); nrofSymbols-r16 ENUMERATED {n1, n2, n4}, repetitionFactor-r16 ENUMERATED {n1, n2, n4} } OPTIONAL -- Need R ]], [[ spatialRelationInfo-PDC-r17 SetupRelease { SpatialRelationInfo-PDC-r17 } OPTIONAL, -- Need M resourceMapping-r17 SEQUENCE { startPosition-r17 INTEGER (0..13); nrofSymbols-r17 ENUMERATED {n1, n2, n4, n8, n10, n12, n14}, repetitionFactor-r17 ENUMERATED {n1, n2, n4, n5, n6, n7, n8, n10, n12, n14} } OPTIONAL, -- Need R partialFreqSounding-r17 SEQUENCE { startRBIndexFScaling-r17 CHOICE{ startRBIndexAndFreqScalingFactor2-r17 INTEGER (0..1); startRBIndexAndFreqScalingFactor4-r17 INTEGER (0..3) }, enableStartRBHopping-r17 ENUMERATED {enable} OPTIONAL -- Need R } OPTIONAL, -- Need R transmissionComb-n8-r17 SEQUENCE { combOffset-n8-r17 INTEGER (0..7); cyclicShift-n8-r17 INTEGER (0..5) } OPTIONAL, -- Need R srs-TCIState-r17 CHOICE { srs-UL-TCIState-r17 TCI-UL-State-Id-r17, srs-DLorJoint-TCIState-r17 TCI-StateId } OPTIONAL -- Need R ]] } }

The following SRS parameters can be semi-statically set by the upper layer parameter SRS-Resource.

- srs-ResourceId determines the SRS resource configuration identifier.

- The number of SRS ports can be set with the upper layer parameter nrofSRS-Ports and can be set to 1, 2 or 4. If nrofSRS-Ports is not set, nrofSRS-Ports is 1.

- The time domain operation of SRS resource placement indicated by the upper layer parameter resourceType can be one of 'periodic', 'semi-persistent', and 'aperiodic' SRS transmission.

- When the SRS resource type is periodic or semi-persistent, the slot level period and slot level offset are determined by the upper layer parameter periodicityAndOffset-p or periodicityAndOffset-sp. The UE expects that SRS resources will not be configured in the same SRS resource set SRS-ResourceSet in different slot level periods. When the upper layer parameter resourceType is set to 'aperiodic' for SRS-ResourceSet, the slot level offset is defined as the upper layer parameter slotOffset.

- The number of OFDM symbols in the SRS resource, the starting OFDM symbol within the slot, and the repetition factor R are set by the upper layer parameter resourceMapping. If R is not set, R is equal to the number of OFDM symbols in the SRS resource.

- SRS bandwidth B_SRS and C_SRS are set by the upper layer parameter freqHopping. If not set, B_SRS becomes 0.

- Frequency hopping bandwidth b_hop is set by the upper layer parameter freqHopping. If not set, b_hop is 0.

- The frequency domain position and configurable shift are set by the upper layer parameters freqDomainPosition and freqDomainShift, respectively. If freqDomainPosision is not set, its value is 0.

- The cyclic shift is set by the upper layer parameters cyclicShift-n2, cyclicShift-n4 or cyclicShift-n8 for transmit comb values 2, 4 and 8, respectively.

- The transmission comb value is set by the upper layer parameter transmissionComb.

- The transmit comb offset is set by the upper layer parameters combOffset-n2, combOffset-n4 or combOffset-n8 for transmit comb values 2, 4 and 8, respectively.

- SRS sequence ID is set by the upper layer parameter sequenceID.

- Adjacent symbols of Ns = 1, 2, or 4 within the last 6 symbols of the slot can be set as the UE's SRS resource with the upper layer parameter resourceMapping in the SRS-Resource. At this time, each symbol of the resource is mapped to all SRS antenna ports.

- Through the upper layer parameter resourceMapping-r16 in the SRS resource, the base station can set Ns = 1, 2, or 4 adjacent symbols at all symbol positions in the slot to the terminal as the terminal's SRS time resource. Additionally, repetitionFactor-r16 can have one of R = 1, 2, or 4, and R can be a divisor of Ns.

- Through the upper layer parameter resourceMapping-r17 in the SRS resource, the base station provides the terminal with Ns = 1, 2, 4, 8, 10, 12, 14 adjacent symbols at all symbol positions in the slot as the terminal's SRS time resource. You can set it. Additionally, repetitionFactor-r17 can have one of the following values: 1, 2, 4, 5, 6, 7, 8, 10, 12, and 14, and R can be a divisor of Ns.

The spatialRelationInfo setting information in Table 17 refers to one reference signal and applies the beam information of the reference signal to the beam used for SRS transmission. For example, the setting of spatialRelationInfo may include information as shown in Table 18 below.

SRS-SpatialRelationInfo ::= SEQUENCE { servingCellId ServCellIndex OPTIONAL, -- Need S referenceSignal CHOICE { ssb-Index SSB-Index, csi-RS-Index NZP-CSI-RS-ResourceId, srs SEQUENCE { resourceId SRS-ResourceId, uplinkBWP BWP-Id } } }

Referring to the spatialRelationInfo setting, in order to use the beam information of a specific reference signal, the index of the reference signal to be referenced, that is, the SS/PBCH block index, CSI-RS index, or SRS index, can be set. The upper signaling referenceSignal is setting information that indicates which reference signal's beam information to refer to for the corresponding SRS transmission, ssb-Index is the index of the SS/PBCH block, csi-RS-Index is the index of CSI-RS, and srs is the index of SRS. Each refers to an index. If the value of the upper signaling referenceSignal is set to 'ssb-Index', the terminal can apply the reception beam used when receiving the SS/PBCH block corresponding to ssb-Index as the transmission beam for the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the terminal can apply the reception beam used when receiving the CSI-RS corresponding to csi-RS-Index as the transmission beam for the corresponding SRS transmission. . If the value of the upper signaling referenceSignal is set to 'srs', the UE can apply the transmission beam used when transmitting the SRS corresponding to srs as the transmission beam for the corresponding SRS transmission.

It was explained that TCI state is used for the beam indication of the downlink channel (indicating the terminal's reception spatial filter value/type) and SpatialRelationInfo is used for the beam indication of the uplink channel (indicating the terminal's transmission spatial filter value/type), but this is used in the uplink and downlink channels. It should be noted that this does not mean a limitation based on link type and that mutual expansion is possible in the future. For example, the conventional downlink TCI state (DL TCI state) adds an uplink channel or signal to the type of target RS that can refer to the TCI state, or the type of referenceSignal (reference RS) included in the TCI state or QCL-Info. It can be expanded to the uplink TCI state (UL TCI state) through methods such as adding an uplink channel or signal. As an example, the base station can set upper layer signaling parameters such as srs-TCIState-r17 in Table 17 above to the terminal and notify information of the SRS transmission beam using the TCI state rather than spatialrelationinfo. In addition, there are various extension methods such as DL-UL joint TCI state, but not all methods are described in order not to obscure the gist of the explanation.

SRS may be composed of a constant amplitude zero auto correlation (CAZAC) sequence. And the CAZAC sequences constituting each SRS transmitted from multiple terminals have different cyclic shift values. Additionally, CAZAC sequences generated through cyclic transition from one CAZAC sequence have the characteristic of having a correlation value of 0 with sequences having cyclic transition values different from the CAZAC sequence. Using these characteristics, SRSs simultaneously allocated to the same frequency region can be distinguished according to the CAZAC sequence cyclic shift value set by the base station for each SRS.

SRSs of various terminals can be classified according to frequency position as well as cyclic shift value. Frequency locations can be divided into SRS subband unit allocation or Comb. Comb2, Comb4, and Comb8 can be supported in 5G or NR systems. In the case of Comb2, one SRS can be allocated only to the even or odd subcarrier within the SRS subband. At this time, each of these even-numbered subcarriers and odd-numbered subcarriers may form one Comb.

Each terminal can be assigned an SRS subband based on a tree structure. Additionally, the UE can perform hopping of the SRS assigned to each subband at each SRS transmission time. Accordingly, all transmission antennas of the terminal can transmit SRS using the entire uplink data transmission bandwidth.

Figure 10 is a diagram showing an example of a structure in which SRS is allocated for each subband.

Referring to FIG. 10, an example of SRS being allocated to each terminal according to a tree structure set by the base station when having a data transmission band corresponding to 40 RB in frequency is shown.

In Figure 10, when the level index of the tree structure is b, the highest level of the tree structure (b=0) may consist of one SRS subband with a bandwidth of 40 RB. At the second level (b=1), two SRS subbands with a bandwidth of 20 RB can be generated from the SRS subband at the b=0 level. Therefore, two SRS subbands may exist in the entire data transmission band of the second level (b=1). At the third level (b = 2), five 4 RB SRS subbands are generated from one 20 RB SRS subband at the level immediately above (b = 1), and a structure in which 10 4RB SRS subbands exist within one level. You can have it.

This tree structure can have various levels, SRS subband sizes, and number of SRS subbands per level depending on the base station settings. Here, the number of SRS subbands at level b generated from one SRS subband of the upper level is N _b , and the indices for these N _b SRS subbands are n _b ={0,...,N _b -1 } can be defined. As the subbands per level change, terminals can be assigned to each subband for each level, as shown in FIG. 10. For example, UE 1 (1000) is assigned to the first SRS subband (n ₁ = 0) of two SRS subbands with 20 RB bandwidth at the b = 1 level, and UE 2 (1001) and UE 3 ( 1002) can be assigned to the first SRS subband (n ₂ = 0) and third SRS subband (n ₂ = 2) positions under the second 20 RB SRS subband, respectively. Through these processes, the UE is able to simultaneously transmit SRS through multiple CCs (component carriers) and transmit SRS to multiple SRS subbands simultaneously within one CC.

Specifically, for the above-described SRS subband configuration, NR supports SRS bandwidth configurations as shown in Table 19 below.

[Table 19]

Additionally, NR supports SRS frequency hopping based on the values in Table 19 above, and detailed procedures are as follows.

As described above, a 5G or NR terminal supports SU-MIMO (Single User) technology and has up to 4 transmission antennas. Additionally, the NR terminal can simultaneously transmit SRSs to multiple CCs or multiple SRS subbands within the CC. In the case of 5G or NR systems, unlike LTE systems, various numerologies are supported, SRS transmission symbols can be set in multiple numbers, and repeated transmission of SRS transmission through a repetition factor can also be allowed.

Therefore, it is necessary to count SRS transmissions taking this into account. Counting SRS transmissions can be used in a variety of ways. For example, counting SRS transmissions can be used to support antenna switching according to SRS transmissions. Specifically, at which SRS transmission time and in which band the SRS corresponding to which antenna is transmitted can be determined by SRS transmission counting.

The UE does not expect to be configured with different time domain operations for SRS resources within the same SRS resource set. Additionally, the terminal does not expect the SRS resource set associated with the SRS resource to be set to a different time domain operation. The SRS request field included in DCI formats 0_1, 1_1, 0_2 (when an SRS request field exists), and 1_2 (when an SRS request field exists) indicates a triggered SRS resource set as shown in Table 21 below. If the upper layer parameter srs-TPC-PDCCH-Group for the UE is set to 'typeB', the 2-bit SRS request area included in DCI format 2_3 indicates the triggered SRS resource set. Alternatively, if the upper layer parameter srs-TPC-PDCCH-Group for the UE is set to 'typeA', the 2-bit SRS request area included in DCI format 2_3 indicates SRS transmission for the set of serving cells set by the upper layer. .

Value of SRS request field	Triggered aperiodic SRS resource set(s) for DCI format 0_1, 0_2, 1_1, 1_2, and 2_3 configured with higher layer parameter srs-TPC-PDCCH-Group set to 'typeB'	Triggered aperiodic SRS resource set(s) for DCI format 2_3 configured with higher layer parameter srs-TPC-PDCCH-Group set to 'typeA'
00	No aperiodic SRS resource set triggered	No aperiodic SRS resource set triggered
01	SRS resource set(s) configured by SRS-ResourceSet with higher layer parameter aperiodicSRS-ResourceTrigger set to 1 or an entry in aperiodicSRS-ResourceTriggerList set to 1 SRS resource set(s) configured by SRS-PosResourceSet with an entry in aperiodicSRS-ResourceTriggerList set to 1 when triggered by DCI formats 0_1, 0_2, 1_1, and 1_2	SRS resource set(s) configured with higher layer parameter usage in SRS-ResourceSet set to ' antennaSwitching ' and resourceType in SRS-ResourceSet set to 'aperiodic' for a 1st set of serving cells configured by higher layers
10	SRS resource set(s) configured by SRS-ResourceSet with higher layer parameter aperiodicSRS-ResourceTrigger set to 2 or an entry in aperiodicSRS-ResourceTriggerList set to 2 SRS resource set(s) configured by SRS-PosResourceSet with an entry in aperiodicSRS-ResourceTriggerList set to 2 when triggered by DCI formats 0_1, 0_2, 1_1, and 1_2	SRS resource set(s) configured with higher layer parameter usage in SRS-ResourceSet set to ' antennaSwitching ' and resourceType in SRS-ResourceSet set to 'aperiodic' for a 2nd set of serving cells configured by higher layers
11	SRS resource set(s) configured by SRS-ResourceSet with higher layer parameter aperiodicSRS-ResourceTrigger set to 3 or an entry in aperiodicSRS-ResourceTriggerList set to 3 SRS resource set(s) configured by SRS-PosResourceSet with an entry in aperiodicSRS-ResourceTriggerList set to 3 when triggered by DCI formats 0_1, 0_2, 1_1, and 1_2	SRS resource set(s) configured with higher layer parameter usage in SRS-ResourceSet set to ' antennaSwitching ' and resourceType in SRS-ResourceSet set to 'aperiodic' for a 3rd set of serving cells configured by higher layers

For PUCCH and SRS scheduled on the same carrier, when the semi-persistent SRS and periodic SRS are set on the same symbol as the PUCCH containing only CSI reporting, only L1-RSRP reporting, or only L1-SINR reporting, the terminal does not transmit SRS. When a semi-persistent SRS or periodic SRS is set on the same symbol as the PUCCH containing HARQ-ACK, link restoration request, and/or SR, or an aperiodic SRS is triggered to be transmitted on the same symbol as the PUCCH containing the above information, the terminal does not transmit SRS. If SRS is not transmitted while overlapping with PUCCH, only the SRS symbol(s) overlapping with PUCCH is dropped. When an aperiodic SRS is triggered to overlap on the same symbol as a PUCCH containing only a semi-persistent/periodic CSI report or only a semi-persistent/periodic L1-RSRP report or only an L1-SINR report, the PUCCH is not transmitted.

In the case of a band-band combination in which simultaneous transmission of SRS and PUCCH/PUSCH is not allowed for intra-band carrier aggregation or inter-band frequency aggregation, the UE must have an SRS in the same symbol. It is not expected that PUSCH/UL DM-RS/UL PT-RS/PUCCH formats will be set from a carrier different from the configured carrier.

For band-band combinations where simultaneous SRS and PRACH transmission is not allowed for intra-band carrier aggregation or inter-band frequency aggregation, SRS from one carrier and SRS from another carrier PRACH is not transmitted simultaneously.

When an SRS resource whose upper layer parameter resourceType is set to 'aperiodic' is triggered on OFDM symbol(s) for periodic/semi-persistent SRS transmission, the UE transmits an aperiodic SRS resource and overlaps the periodic/semi-persistent SRS resource(s) with the corresponding symbol(s). Semi-persistent SRS symbol(s) are dropped, and non-overlapping periodic/semi-persistent SRS symbol(s) are transmitted. When an SRS resource whose upper layer parameter resourceType is set to 'semi-persistent' is triggered on OFDM symbol(s) for periodic SRS transmission, the UE transmits a semi-persistent SRS resource and uses periodic SRS symbol(s) during the overlapped symbol. is dropped and non-overlapping periodic SRS symbol(s) are transmitted.

When the upper layer parameter usage in the UE's SRS-ResourceSet is set to 'antennaSwitcing' and the guard period of the Y symbol is set, the UE follows the same priority rules as previously defined as if SRS is set even during the guard period.

When activating or updating the upper layer parameter spatialRelationInfo of a semi-persistent or aperiodic SRS resource with a MAC CE for a CC/bandwidthpart indicated by a set of upper layer parameters applicableCellList, the same for all bandwidthparts within the indicated CCs. Apply spatialRelationInfo to semi-persistent or aperiodic SRS resource(s) with SRS resource ID.

The upper layer parameter spatialRelationInfo for an SRS resource is set to FR2 unless the upper layer parameter enableDefaultBeamPlForSRS is set to 'enable' and the upper layer parameter usage of the SRS resource is set to 'beamManagement' or is set to 'nonCodebook' with the associatedCSI-RS setting. is not set and when the upper layer parameter pathlossReferenceRS for the terminal is not set, the terminal transmits the target SRS resource according to the settings below.

- Transmit the target SRS resource through the same spatial domain transmission filter as that of the CORESET with the lowest controlResoureSetID in the activated DL bandwidth part in the CC.

- If the UE has not set any CORESET in the CC, the target SRS resource is transmitted through the same spatial domain transmission filter that received the activated TCI state with the lowest ID applicable to the PDSCH in the activated DL bandwidth part of the CC.

Table 21 indicates the terminal capability containing resource-related information of the uplink reference signal for positioning.

Index	Feature group	Components
13-8	SRS Resources for Positioning	I. Max number of SRS Resource Sets for positioning supported by UE per BWP. Values ={1,2,4,8,12,16}. 2. Max number of P/SP/AP SRS Resources for positioning per BWP. Values = {1,2,4,8,16,32,64} 3. Max number of P/SP/AP SRS Resources including the SRS resources for positioning per BWP per slot. Values = {1, 2, 3, 4, 5, 6, 8, 10, 12, 14} Note: Max number of P/SP/AP SRS Resources in Component 3 include both SRS resources configured by SRS-Resource and SRS resources configured by SRS-PosResource-r16 supported by UE 4. Max number of periodic SRS Resources for positioning per BWP. Values = {1,2,4,8,16,32,64} 5. Max number of periodic SRS Resouroes for positioning per BWP per slot. Values = {1,2,3,4,5,6,8,10,12,14} OLPC for SRS for positioning based on SSB from serving cell is part of FG13-8 Note: no dedicated capability signaling is intended for this component

A UE that reports the UE capabilities in Table 21 (hereinafter expressed as FG 13-8) can transmit an uplink reference signal at all OFDM symbol positions within a random slot when transmitting an uplink reference signal.

Table 22 refers to the terminal capability containing information on the transmission symbol position within the slot of the uplink reference signal in the unlicensed band.

Index	Feature group	Components
10-11	SRS starting position at any OFDM symbol in a slot	1. Support transmitting SRS starting in all symbols (0, ..., 13) of a slot

When transmitting an uplink reference signal, the terminal reporting the terminal capabilities of Table 22 (hereinafter expressed as FG 10-11) can transmit the uplink reference signal at all OFDM symbol positions in any slot in both unlicensed and licensed bands. there is.

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

Hereinafter, in this disclosure, when determining whether to apply cooperative communication, the terminal determines whether the PDCCH(s) allocating the PDSCH to which cooperative communication is applied has a specific format, or the PDCCH(s) allocating the PDSCH to which cooperative communication is applied is cooperative. It includes a specific indicator indicating whether communication is applied, or the PDCCH(s) allocating the PDSCH to which cooperative communication is applied is scrambled with a specific RNTI, or assumes application of cooperative communication in a specific section indicated by the upper layer, etc. It is possible to use a variety of methods. For convenience of explanation, the case where the UE receives a PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

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

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

For convenience in the following description of the present disclosure, cells, transmission points, panels, beams, or /and transmission direction can be unified and described as TRP (transmission reception point), beam, or TCI state. Therefore, in actual application, TRP, beam, or TCI state can be appropriately replaced with one of the above terms.

Hereinafter, in this disclosure, when determining whether to apply cooperative communication, the terminal determines whether the PDCCH(s) allocating the PDSCH to which cooperative communication is applied has a specific format, or the PDCCH(s) allocating the PDSCH to which cooperative communication is applied is cooperative. It includes a specific indicator indicating whether communication is applied, or the PDCCH(s) allocating the PDSCH to which cooperative communication is applied is scrambled with a specific RNTI, or assumes application of cooperative communication in a specific section indicated by the upper layer, etc. It is possible to use a variety of methods. For convenience of explanation, the case where the UE receives a PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

Hereinafter, embodiments of the present disclosure will be described in detail with the accompanying drawings. Hereinafter, the base station is an entity that performs resource allocation for the terminal and may be at least one of gNode B, gNB, eNode B, Node B, BS (Base Station), wireless access unit, base station controller, or node on the network. A terminal may include a UE (User Equipment), MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. Hereinafter, embodiments of the present disclosure will be described using the 5G system as an example, but embodiments of the present disclosure can also be applied to other communication systems with similar technical background or channel types. For example, this may include LTE or LTE-A mobile communication and mobile communication technologies developed after 5G. Accordingly, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure at the discretion of a person skilled in the art. The content in this disclosure is applicable to FDD and TDD systems.

Additionally, when describing the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of the functions in the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

In describing the present disclosure below, upper 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

- RRC (Radio Resource Control)

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

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

- PDCCH (Physical Downlink Control Channel)

- DCI (Downlink Control Information)

- UE-specific DCI

- Group common DCI

- Common DCI

- Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

- Non-scheduling DCI (e.g. 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 the one with the higher priority and performing the corresponding operation according to a predetermined priority rule, or selecting the one with the lower priority. It can be mentioned in various ways, such as omit or drop the action.

Hereinafter, the term slot used in the present disclosure is a general term that can refer to a specific time unit corresponding to a Transmit Time Interval (TTI). Specifically, it may refer to a slot used in a 5G NR system, or a 4G LTE system. It may also mean a slot or subframe used in.

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

<First embodiment: SRS resource configuration and instruction method>

As an embodiment of the present disclosure, an SRS resource configuration and indication method will be described. As described above, the conventional SRS resource supports up to 4 antenna ports (hereinafter, can be used interchangeably with antenna port, port, port), and for the positions of all SRS resource transmission symbols determined based on upper layer signaling, the terminal SRS transmission can be performed through all ports in each symbol. For example, if the terminal received a 4-port SRS resource with 4 transmission symbols as upper layer signaling from the base station, the terminal could perform transmission through 4-port in each symbol.

In the future, advanced releases of NR are expected to be able to support improved standards by considering up to 8 antenna ports of the terminal, and the corresponding functions are currently being discussed in NR release 18, with a future release or further move to the 6th generation. In a communication system, there may be a possibility to consider more than 8 antenna ports on the terminal side. However, as is currently supported, when SRS is transmitted from all ports configured for each symbol on which SRS is transmitted, if the number of ports increases, the transmission power for each port is reduced when transmitting SRS, which may result in insufficient coverage, such as in a terminal at a cell border. In some cases, base station reception performance may be limited. Therefore, the base station and the terminal can consider various methods as follows for SRS transmission with N antenna ports, which is an arbitrary number greater than 4 on the terminal side. Hereinafter, SRS resource transmission can be understood as transmission of SRS according to SRS resource. Additionally, transmission of SRS antenna ports can be understood as transmission of SRS with the characteristics of each antenna port.

[Method 1-1] Method 1 of using a single SRS resource

The terminal can receive a single SRS resource from the base station to transmit SRS with N antenna ports. The base station can set a single SRS resource with N antenna ports to the terminal. In this case, when transmitting SRS in a single or multiple symbols of the SRS resource through N antenna ports, N antenna ports are connected to each symbol. Everything can be transmitted. For example, if the terminal transmits the SRS resource of N antenna ports with the number N _s of SRS symbols set to 4, the SRS resource can be transmitted through all N antenna ports in each symbol.

Since Method 1-1 supports the current standards for 1, 2, and 4 antenna ports all based on a single SRS resource, the definitions of various time and frequency resource allocation-related parameters in Table 17 described above can be used as is. , Therefore, method 1-1 may be a natural expansion as the number of antenna ports of the terminal increases. However, based on method 1-1, since the terminal transmits all antenna ports in one symbol, there may be a problem that the transmission power for each antenna port in one symbol is reduced.

[Method 1-2] Method 2 using a single SRS resource

The terminal can receive a single SRS resource from the base station to transmit SRS with N antenna ports. The base station can set a single SRS resource with N antenna ports to the terminal, and when transmitting SRS in one or more symbols set in the SRS resource, the number of antenna ports used when transmitting each symbol is greater than N. It may be less than or equal to, and the number of symbols required to transmit SRS resources through all N antenna ports may be greater than or equal to 1.

Method 1-2 is a method in which SRS resources are transmitted through some of the N antenna ports in each symbol, so the transmission power of the antenna port for each symbol is transmitted using all N antenna ports for each symbol. It can be increased compared to 1-1. However, since transmission through the antenna port of Method 1-2 is different from the definition of the existing standard in which SRS is transmitted in each symbol through all antenna ports set to a specific SRS resource, various time and frequency resource allocation-related parameters in Table 17 above Some of their definitions may change or new definitions may be needed.

[Method 1-3] How to use multiple SRS resources

The terminal can receive a plurality of SRS resources from the base station to transmit SRS having N antenna ports. In order to support SRS transmission corresponding to N antenna ports from the terminal, the base station can set M (M>1) SRS resources with antenna ports with a value less than or equal to N to the terminal. At this time, each SRS When transmitting SRS in a single or multiple symbols of the corresponding SRS resource through antenna ports less than or equal to the number of N set in the resource, both SRS resources can be transmitted in each symbol.

For example, if the terminal is configured with two SRS resources with 4 antenna ports for each SRS resource for SRS transmission of 8 antenna ports and N _s is set to 4 for both SRS resources, both SRS resources For each symbol, both SRS resources can be transmitted through four antenna ports. At this time, a plurality of SRS resources may be included in the same SRS resource set or may be included in different SRS resource sets. As described above, a plurality of SRS resources configured for SRS transmission of N (>4) antenna ports may be referred to as an SRS resource group. The number N of antenna ports that can be expressed as a plurality of SRS resources may be the number of antenna ports greater than 4, and may be values such as 6, 8, 12, and 16, which represents 1, 2, and 4 antenna ports. Branches can be expressed as SRS resources. The terminal can expect that all SRS resources included in each SRS resource group, which can be set by the base station or determined by the above-mentioned rules, have the same number of antenna ports (4 antenna ports per SRS resource as in the example above) can have). Additionally, the case of having different numbers of antenna ports may not be ruled out. For example, if three SRS resources are set to represent N = 8 antenna ports, the first and second SRS resources may have two antenna ports, and the third SRS resource may have four antenna ports.

Method 1-3, unlike the method based on one SRS resource supported by the current standard, allows multiple SRS resources to be transmitted through N antenna ports, so various time and frequency resource allocations in Table 17 above are related. Some of the definitions of parameters may change or there may be parts that require new definitions. However, similar to method 1-2, since the number of antenna ports used for transmission for each symbol of each SRS resource is less than or equal to N, the total number of antenna ports, the power transmitted for each port can be increased.

[Method 1-4] Select method from [Method 1-1] to [Method 1-3] described above

In order to transmit an SRS with N antenna ports, the terminal may be semi-statically or dynamically instructed by the base station to use one of the above-described [Method 1-1] to [Method 1-3]. For example, the terminal can use one of the above-described [Method 1-1] to [Method 1-3] by receiving it as upper layer signaling from the base station, or receive instructions dynamically through L1 signaling. Alternatively, the terminal can use any one of [Method 1-1] and [Method 1-2], one of [Method 1-1] and [Method 1-3], or [Method 1-2] and [Method 1-3] ] Either one of the two methods can be used by receiving settings from the base station as upper layer signaling, or it can be dynamically instructed through L1 signaling. If the terminal is located inside the cell and coverage is sufficient, the base station sets SRS transmission for N antenna ports based on [Method 1-1] to the corresponding terminal as upper layer signaling, or dynamically through L1 signaling. You can instruct. Dynamically indicating through L1 signaling may be indicated through a new field in the DCI format, for example, or using a reserved code point of a currently existing DCI field. As an example, the SRS request field can be used. there is.

The terminal can report to the base station whether it can support at least one combination of the above-described [Method 1-1] to [Method 1-4] using the terminal capabilities. The corresponding terminal capability report may be reported differently depending on the frequency range (FR), and may be reported by band, band combination, feature set, and feature set per CC. Additionally, the above-described terminal capabilities may each be independent terminal capabilities, or support for each method may be defined as a plurality of components within a single terminal capability.

If the terminal supports a combination of at least one of the above-described [Method 1-1] to [Method 1-4], codebook and antenna switching may be possible for usage, which is upper layer signaling of the SRS resource set. Additionally, cases where the usage is non-codebook and beam management may not be excluded.

When following [Method 1-3] described above, if the terminal has received multiple SRS resources configured in the same SRS resource set, the maximum number of SRS resources in the corresponding SRS resource set that the terminal can receive through upper layer signaling is There may be 4 or more. If the terminal has multiple SRS resources configured in different SRS resource sets, the terminal can receive two or more SRS resource sets whose usage is codebook through upper layer signaling.

When following [Method 1-3] described above, the terminal uses multiple SRS resources for SRS transmission with N antenna ports, so DCI format 0_1, 0_2 transmitted from the base station for scheduling for codebook-based PUSCH transmission. It may be necessary to change the definition of the code point within the SRS resource indicator (SRI). While each code point of the current SRI indicates a single SRS resource, if the terminal is set to use the above-described [Method 1-3] from the base station, the definition of the code point of the SRI field is in the following methods. It may change accordingly.

[Method 1-3-1] SRS resource group instruction

The terminal may assume that each code point of the SRI field in DCI format 0_1 and 0_2 indicated by the base station indicates an SRS resource group containing a plurality of SRS resources. For example, if there are two code points of SRI, the first code point may indicate SRS resource group 0, and the second code point may indicate SRS resource group 1. At this time, SRS resource group 0 may include SRS resources 0 and 1, and SRS resource group 1 may include SRS resources 2 and 3. The terminal can receive settings for this SRS resource group from the base station to the upper layer. Additionally, when a plurality of SRS resources are set from the base station in the same SRS resource set, the terminal may determine a specific number of SRS resources starting from a low SRS resource index within the SRS resource set as one group.

The total number of antenna ports expressed through a plurality of SRS resources can be set for each SRS resource set. For example, if the number of antenna ports in the SRS resource set is set to 8, the total number of SRS resources is set to 4, and the index of each SRS resource is 0 to 3, SRS resource index 0 and 1 are the first SRS It can be a resource group, and SRS resource indices 2 and 3 can be the second SRS resource group. In this case, the first SRS resource group may correspond to the first code point of the SRI field, and the second SRS resource group may correspond to the second code point.

[Method 1-3-2] Similar to the case of noncodebook, the terminal indicating the combination of multiple SRS resources indicates that each code point of the SRI field in DCI format 0_1 and 0_2 indicated by the base station represents a combination of single or multiple SRS resources. It can be assumed. This may be similar to the meaning of the SRI field in DCI format 0_1 and 0_2 for scheduling noncodebook-based PUSCH transmission. If 4 SRS resources are set in the SRS resource set whose usage is set to noncodebook, each code point of the SRI field in DCI format 0_1 and 0_2 for scheduling Noncodebook-based PUSCH transmission is 1 to 4 of the 4 SRS resources. A total of 2 ⁴ -1 = 15 code points may be needed to express all of the ways to select . Similar to the noncodebook method that considers all methods of selecting the subset from all SRS resources set in this way, method 1-3-2 can use a method of selecting all or part of the subset.

For example, assuming that the number of all configured SRS resources is M, and if it is assumed that all M SRS resources have the same number of antenna ports, only a combination of a certain number of SRS resources among the M can be considered. For example, only the method of selecting 2 out of M can be considered. In this case, the SRI field can have as many code points as selecting 2 out of M. If it is assumed that M SRS resources can have different numbers of antenna ports, considering the combination of a specific number or another specific number of SRS resources among the M, the total number of antenna ports each combination of SRS resources has can produce the same case. The SRI field may have a code point that can indicate a combination of each SRS resource. For example, if one SRS resource set has 4 SRS resources with 2 antenna ports and 2 SRS resources with 4 antenna ports, a total of 8 antenna ports can be created using multiple SRS resources. When expressing, a combination of two SRS resources with 4 antenna ports can be used, or a combination of 1 SRS resource with 4 antenna ports and 2 SRS resources with 2 antenna ports can be used.

[Method 1-3-3] Indication of one SRS resource and automatic indication of other SRS resources connected to the indicated SRS resource

The terminal may assume that each code point of the SRI field in DCI format 0_1 and 0_2 indicated by the base station represents a single SRS resource, and the single SRS resource indicated by each code point may be connected to a plurality of other SRS resources. The sum of the number of all SRS ports set in a plurality of other SRS resources connected to the single SRS resource may be N. The connection can be established through upper layer signaling. Without changing the definition of each code point of the SRI field, the base station and the terminal can indicate one SRS resource to the terminal and simultaneously indicate a plurality of SRS resources connected to it through higher layer signaling.

The terminal can report to the base station whether it can support at least one combination of the above-described [Method 1-3-1] to [Method 1-3-3] using the terminal capabilities. The corresponding terminal capability report may be reported differently depending on the frequency range (FR), and may be reported by band, band combination, feature set, and feature set per CC. Additionally, the above-described terminal capabilities may each be independent terminal capabilities, or support for each method may be defined as a plurality of components within a single terminal capability.

Regarding the above-described [Method 1-3], if the terminal receives upper layer signaling from the base station for a plurality of SRS resources to use the above-described [Method 1-3-1] to [Method 1-3-3], etc. If received, the terminal receives from the base station, among the various upper layer signaling configuration information in the SRS resource mentioned in Table 17 above, the upper layer that must be set identically for a plurality of SRS resources required to transmit an SRS with N antenna ports. Signaling configuration information and information that may be the same or different between each SRS resource can be distinguished.

Among the parameters in Table 17, the terminal includes parameters such as groupOrSequenceHopping and sequenceId, which are parameters related to the transmission sequence of the SRS, and parameters such as resourceType, which indicates periodic, quasi-static, and aperiodic transmission of the SRS resource. It can be expected that the multiple SRS resources required to transmit are all set the same.

In addition, among the parameters in Table 17, the terminal transmits an SRS with N antenna ports for resourceMapping, resourceMapping-r16, and resourceMapping-17, which are information related to time resource allocation of SRS, and freqDomainPosition, freqDomainShift, and freqHopping, which are information related to frequency resource allocation. You can expect that the multiple SRS resources required to do this will be set the same or different. In addition, the terminal can expect transmissionComb, transmissionComb-n8-r17, which determines the frequency and location of SRS transmission RE, to have the same Comb value for multiple SRS resources, and Comb offset to be set the same or different. there is. Additionally, the UE can expect that the partial factor set for the RB level partial frequency sounding operation of SRS will also have the same value for a plurality of SRS resources.

The terminal can expect that among the parameters in Table 17, information such as spatialrelationinfo and srs-TCIState-r17, which are information that determines the SRS transmission beam, are set the same or different for a plurality of SRS resources. In particular, when a plurality of SRS resources are set in different SRS resource sets, the terminal can expect the two parameters related to transmission beam determination to be set differently for the plurality of SRS resources.

<Second embodiment: SRS time resource allocation, repetitive transmission, and frequency hopping method>

As an embodiment of the present disclosure, the SRS time resource allocation, repetitive transmission, and frequency hopping methods according to the SRS resource configuration and indication method described above in the above embodiment will be described.

According to Table 17 above, the terminal has startPosition, which means the transmission start symbol within the slot of the SRS resource, nrofSymbols, which means the number of symbols continuously transmitted from the transmission start symbol within the slot, and frequency resources at the same location when performing frequency hopping. Through upper layer signaling such as repetitionFactor, which means the number of consecutive symbols with , the time axis transmission resource location can be determined during frequency hopping of the SRS resource.

In the above embodiment, when [Method 1-1] is used, that is, when one SRS resource is configured with all N antenna ports and the SRS resource is transmitted using all N antenna ports for each transmission symbol, the terminal Can perform operations according to the following operations or a combination of parts thereof depending on the combination of startPosition, nrofSymbols, and repetitionFactor, which are upper layer signaling, for periodic/semi-persistent/aperiodic SRS transmission.

- The terminal can receive nrofSymbols-r17 (hereinafter named N _s ), which is upper layer signaling, for aperiodic SRS and set to 2, 4, 8, 10, 12 or 14, and repetitionFactor-r17 (hereinafter named R) It can be set to 1, and when performing frequency hopping, only frequency hopping within a slot may be possible. When performing frequency hopping, the number of consecutive symbols with frequency resources at the same location can be 1 (=R). .

■ By configuring the corresponding upper layer signaling to the terminal, the base station allocates relatively small frequency resources to the terminal when transmitting SRS in each OFDM symbol, thereby reducing the power consumption of the terminal (this reduces power consumption compared to wide frequency resource allocation). channel estimation at a plurality of different frequency resource locations can be made possible through frequency hopping.

- The UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4 for aperiodic SRS, and R can be set to a value greater than or equal to 2, where R is a divisor of N _s. When performing frequency hopping, only intra-slot frequency hopping may be possible, and when performing frequency hopping, the number of consecutive symbols having frequency resources at the same location may be R.

■ The base station sets the corresponding upper layer signaling to the terminal, so that if the terminal is located in a shadow area among the coverage of the base station and the channel estimation performance at the base station through reception of SRS transmitted from the terminal is poor, multiple signals are received at a specific frequency location of the terminal. Channel estimation accuracy can be improved through SRS transmission on OFDM symbols, and channel estimation at a plurality of different frequency resource locations can be made possible through frequency hopping.

- The terminal can have N _s set to 1 and R set to 1 for periodic/semi-persistent SRS, and when performing frequency hopping, only frequency hopping between slots may be possible. The number of consecutive symbols having frequency resources at the same location can be 1 (=R).

■ The base station sets the corresponding upper layer signaling to the terminal, so that if the terminal is located in a place with good channel conditions among the coverage of the base station and the channel estimation performance at the base station through reception of SRS transmitted from the terminal is poor, the terminal's single OFDM symbol Effective channel estimation performance can be secured only through SRS transmission, and although it is a periodically transmitted signal, time resource consumption for this can be reduced, and the time resources thus secured can be utilized for other uplink and downlink scheduling purposes.

- For periodic/semi-persistent SRS, the UE can have N _s , which is upper layer signaling, set to a value greater than or equal to 4, and R can be set to a value greater than or equal to 2, where R is the value of N _s . It may be a divisor, and when performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, the number of consecutive symbols having frequency resources at the same location may be R.

■ By configuring the corresponding upper layer signaling to the terminal, the base station can improve channel estimation accuracy through SRS transmission on multiple OFDM symbols at a specific frequency location of the terminal, and can improve channel estimation accuracy at multiple different frequency resource locations through frequency hopping. Channel estimation may be possible.

- For periodic/semi-persistent SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4, and R can be set to a value equal to N _s . When performing frequency hopping, inter-slot Frequency hopping may be possible, and when frequency hopping is performed, the number of consecutive symbols with frequency resources at the same location within each slot may be R (=N _s ).

■ The base station sets the corresponding upper layer signaling to the terminal, allowing the terminal to perform repetitive transmission using multiple time resources at the same frequency resource location, thereby improving the channel estimation accuracy for the corresponding frequency resource location when receiving the base station's SRS. You can.

In the above embodiment, when [Method 1-2] is used, that is, when one SRS resource is configured with N antenna ports and some of the N antenna ports are transmitted for each transmission symbol, the terminal uses upper layer signaling. The following operations can be performed by considering the definitions of startPosition, nrofSymbols, and repetitionFactor as follows.

[Time resource operation 2-1]

The terminal may regard the definition of N _s as meaning the number of consecutive symbols through which the corresponding SRS resource is transmitted as before. If one SRS resource is configured for N antenna ports, and the SRS resource is transmitted through some of the N antenna ports for each transmission symbol, then M Assuming that symbols are needed, the terminal can expect to receive N _s with M as a divisor for the corresponding SRS resource.

For example, if the terminal is configured with N = 8 antenna ports, SRS resources are transmitted through 4 antenna ports for each transmission symbol, and SRS resources are transmitted through all N = 8 antenna ports through M = 2 symbols. Assuming that this is the case, the terminal can receive one of N _s = 2, 4, 8, 10, 12, and 14, which are multiples of M = 2, for the corresponding SRS resource. If N _s is 4, the number of consecutive symbols through which the corresponding SRS resource is transmitted is 4, and through some 4 of the total 8 antenna ports (for example, SRS antenna ports 0 to 3), the first and third The SRS resource is transmitted in the symbol, and it can be expected that the SRS resource is transmitted in the second and fourth symbols through another four of a total of eight antenna ports (for example, SRS antenna ports 4 to 7). In another method, the SRS resource is transmitted in the first two symbols through some 4 of the total 8 antenna ports (e.g. SRS antenna ports 0 to 3), and another 4 of the total 8 antenna ports (e.g. SRS resources can be expected to be transmitted in the remaining two symbols through SRS antenna ports 4 to 7). (The present disclosure may not be limited to the above-described example, and as another example, it may not be excluded that some 4 of the total 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.)

The terminal may assume that the definition of R means the number of consecutive symbols having frequency resources at the same location where the corresponding SRS resource is transmitted as before. Therefore, as described above, the R value that can be set by the terminal may be a divisor of N _s . At this time, if the terminal receives N antenna ports for one SRS resource and the SRS resource is transmitted through some of the N antenna ports for each transmission symbol, if the SRS resource is transmitted through all N antenna ports Assuming that M symbols are required to be transmitted, the minimum value of R can be 1 or M.

- If the minimum value of R that the terminal can set is 1, it means that the number of consecutive symbols with the same frequency resource is 1. In this case, in one symbol, only some of the N antenna ports are transmitted. Therefore, for each group of certain antenna ports (transmitted in a specific symbol) among the N antenna ports, the SRS corresponding to the corresponding antenna ports may be transmitted at different frequency positions. Therefore, since SRSs corresponding to all N antenna ports cannot be transmitted at the same frequency location, when the base station receives the corresponding SRS and performs channel estimation, channel information for a specific antenna port may be absent at some frequency resource locations. Therefore, the base station may need to use the frequency location where channel information exists to estimate channel information at the frequency location where channel information does not exist. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

- If the minimum value of R that the terminal can set is M, it means that the number of consecutive symbols with the same frequency resource is M, and in this case, all N antenna ports can be transmitted during the M symbols. Therefore, SRS corresponding to N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for all N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- The minimum value of R that the terminal can receive is 1 or M, which is set by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, or activated/deactivated through MAC-CE signaling. Alternatively, it may be defined and operated within the standard.

Based on the time resource operation 2-1, the terminal performs the following operations or a partial combination thereof according to the combination of startPosition, nrofSymbols, and repetitionFactor, which are upper layer signaling, for periodic/semi-persistent/aperiodic SRS transmission. It can be done.

- The terminal can have N _s set to 2, 4, 8, 10, 12 or 14 for aperiodic SRS, R can be set to 1 or M, M can be a divisor of N _S , and the terminal When performing this frequency hopping, only intra-slot frequency hopping may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same location may be 1 or M (=R). Determination of the R value can follow one of the methods described above.

■ If M is a divisor of N _s greater than 1 (for example, when M = 2) and R is 1, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and at other frequency locations. SRS transmission is performed for the remaining portion of the total N antenna ports. That is, because SRSs corresponding to all N antenna ports cannot be transmitted at the same frequency location, when the base station receives the corresponding SRS and performs channel estimation, the channel information of a specific antenna port is absent at some frequency resource locations, so the base station It may be necessary to estimate channel information at a frequency location where channel information does not exist by using a frequency location where channel information exists. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

■ If M is a divisor of N _s greater than 1 (for example, when M = 2) and R is M, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and such frequency location SRS transmission is performed for the remaining portion of the total N antenna ports. That is, SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- For aperiodic SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4, and R can be set to a value greater than or equal to 2 or a value greater than or equal to M. In this case, R or/and M may be divisors of N _s , and when performing frequency hopping, only frequency hopping within a slot may be possible. When performing frequency hopping, the number of consecutive symbols having frequency resources at the same location is R. It could be a dog.

■ If M is a divisor of N _s greater than 1 (for example, when M = 2) and R is 2, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and such frequency location SRS transmission is performed for the remaining portion of the total N antenna ports. That is, SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If M is a divisor of N _s greater than 1 (for example, when M = 2) and R is 4, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and such frequency location Since SRS transmission is performed for the remaining part of the total N antenna ports, SRS corresponding to the total N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and channel estimation at the base station by repeated transmission of SRS according to the R value Performance improvements may also be possible.

- The terminal can have N _s set to M and R set to M for periodic/semi-persistent SRS. When performing frequency hopping, only frequency hopping between slots may be possible. The number of consecutive symbols having frequency resources at the same location may be M (=R).

■ By configuring the above-mentioned upper layer signaling to the terminal, the base station minimizes time resource consumption despite periodic SRS transmission and transmits SRS for all N antenna ports to different antenna ports of M symbols. By dividing into SRS transmission, more power allocation gain per port and more multiplexing gain with SRS transmission of other terminals can be obtained.

- For periodic/semi-persistent SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4, and R to a value greater than or equal to 2 or a value greater than or equal to M, At this time, R or/and M may be divisors of N _s , and when performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, consecutive symbols having frequency resources at the same location are used. The number of may be R.

■ If M is a divisor of N _s greater than 1 (for example, when M = 2) and R is 2, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and such frequency location Since SRS transmission is performed for the remaining part of the total N antenna ports, SRS corresponding to the total N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If M is a divisor of N _s greater than 1 (for example, when M = 2) and R is 4, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and such frequency location Since SRS transmission is performed for the remaining part of the total N antenna ports, SRS corresponding to the total N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and the channel at the base station by repeated transmission of the SRS is determined by the R value. Improvements in estimation performance may also be possible.

- For periodic/semi-persistent SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4, and R can be set to a value equal to N _s . When performing frequency hopping, within the slot Alternatively, frequency hopping between slots may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same location may be R (=N _s ).

■ The base station sets the corresponding upper layer signaling to the terminal, allowing the terminal to perform repeated transmission using multiple time resources at the same frequency resource location, thereby improving the channel estimation accuracy for the corresponding frequency resource location when receiving SRS at the base station. You can do it.

[Time resource operation 2-2]

If M is defined as the number of symbols required for all antenna ports of the corresponding SRS resource to be transmitted, the terminal defines N _s as a value for how many times the M symbols used to transmit the corresponding SRS resource are used. I can understand. In other words, N _s is not the number of consecutive symbols used to transmit the SRS resource, which is the existing definition, but the number of M symbol units used to transmit all N antenna ports set in the SRS resource. It can be defined as information about whether For example, if the terminal is configured with N = 8 antenna ports, SRS resources are transmitted through 4 antenna ports for each transmission symbol, and SRS resources are transmitted through all N = 8 antenna ports in M = 2 symbols. Assuming that this is the case, the terminal can receive one of N _s = 1, 2, 4, 5, 6, or 7 as information on how many times M = 2 symbol units are used consecutively for the corresponding SRS resource. . For example, if N _s is 2, the total number of consecutive symbols through which the corresponding SRS resource is transmitted may be 4, which may mean that M = 2 symbol units are used twice in succession.

In addition, SRS resources are transmitted in the first and third symbols through some 4 of a total of 8 antenna ports (e.g., SRS antenna ports 0 to 3), and another 4 of a total of 8 antenna ports (e.g., It can be expected that SRS resources are transmitted in the second and fourth symbols through the antenna ports of SRS antenna ports 4 to 7). In another method, the SRS resource is transmitted in the first two symbols through some 4 of the total 8 antenna ports (e.g. SRS antenna ports 0 to 3), and another 4 of the total 8 antenna ports (e.g. SRS resources can be expected to be transmitted in the remaining two symbols through the antenna ports of SRS antenna ports 4 to 7). (The present disclosure may not be limited to the above-described example, and as another example, it may not be excluded that some 4 of the total 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.)

The terminal may assume that the definition of R means the number of consecutive symbols having frequency resources at the same location where the corresponding SRS resource is transmitted as before. Therefore, as described above, the R value that can be set by the terminal may be a divisor of N _s . At this time, if one SRS resource is configured for N antenna ports, and some of the N antenna ports are transmitted for each transmission symbol, M symbols are required for all N antenna ports to be transmitted. Assuming, the minimum value of R could be 1 or M.

- If the minimum value of R that the terminal can receive is 1, it means that the number of consecutive symbols with the same frequency resource is 1. In this case, only some of the N antenna ports can be transmitted in one symbol. Therefore, for each group of certain antenna ports (transmitted in a specific symbol) among the N antenna ports, the SRS corresponding to the corresponding antenna ports may be transmitted at different frequency positions. Therefore, since SRSs corresponding to all N antenna ports cannot be transmitted at the same frequency location, when the base station receives the corresponding SRS and performs channel estimation, channel information for a specific antenna port may be absent at some frequency resource locations. Therefore, the base station may need to use the frequency location where channel information exists to estimate channel information at the frequency location where channel information does not exist. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

- If the minimum value of R that the terminal can receive is M, it means that the number of consecutive symbols with the same frequency resource is M, and at this time, all N antenna ports can be transmitted during the M symbols. , SRS corresponding to N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for all N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- The minimum value of R that the terminal can receive is 1 or M, which is set by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, or activated/deactivated through MAC-CE signaling. Alternatively, it may be defined and operated within the standard.

Based on the time resource operation 2-2, the terminal performs the following operations or a partial combination thereof according to the combination of startPosition, nrofSymbols, and repetitionFactor, which are upper layer signaling for periodic/semi-persistent/aperiodic SRS transmission. It can be done.

- The UE can have N _s set to 1, 2, 4, 5, 6, or 7 for aperiodic SRS, and R can be set to 1 or M. When performing frequency hopping, only frequency hopping within a slot is performed. This may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same location may be 1 or M (=R). Determination of the R value can follow one of the methods described above.

■ If M is 2 and R is 1, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at a different frequency location. , SRSs corresponding to all N antenna ports may not be transmitted at the same frequency location. That is, when the base station receives the corresponding SRS and performs channel estimation, the channel information of a specific antenna port may be absent at some frequency resource locations, so the base station uses the frequency location where channel information exists to frequency where channel information does not exist. It may be necessary to estimate channel information for a location. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

■ If M is 2 and R is M, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location. , SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- For aperiodic SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 2 (=1 of 2, 4, 5, 6, and 7), and set R to a value greater than or equal to 2. Alternatively, it can be set to a value greater than or equal to M. When performing frequency hopping, only frequency hopping within a slot may be possible. When performing frequency hopping, the number of consecutive symbols with frequency resources at the same location is R. You can.

■ If M is 2 and R is 2, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location. , SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If M is 2 and R is 4, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location. Therefore, SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and channel estimation at the base station by repeated transmission of SRS according to the R value Performance improvements may also be possible.

- The terminal can have N _s set to M and R set to M for periodic/semi-persistent SRS. When performing frequency hopping, only frequency hopping between slots may be possible. The number of consecutive symbols having frequency resources at the same location may be M (=R).

■ By configuring the above-mentioned upper layer signaling to the terminal, the base station minimizes time resource consumption despite periodic SRS transmission and transmits SRS for all N antenna ports in M symbols corresponding to different antenna ports. By dividing into SRS transmission, more power allocation gain per port and more multiplexing gain with SRS transmission of other terminals can be obtained.

- For periodic/semi-persistent SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 2 (=1 of 2, 4, 5, 6, 7), and R is greater than 2 or It can be set to the same value or a value greater than or equal to M. When performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, consecutive symbols with frequency resources at the same location are used. The number may be R.

■ If M is 2 and R is 2, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location. Therefore, SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If M is 2 and R is 4, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location. , SRS corresponding to a total of N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and the channel at the base station by repeated transmission of the SRS is determined by the R value. Improvements in estimation performance may also be possible.

- The UE can set N _s , which is upper layer signaling, to a value greater than or equal to 2 (=1 of 2, 4, 5, 6, 7) for periodic/semi-persistent SRS, and set R to M*N _s. It can be set to the same value, and when performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, the number of consecutive symbols with frequency resources at the same location is R (=M *N _s ).

■ The base station sets the corresponding upper layer signaling to the terminal, allowing the terminal to perform repeated transmission using a plurality of time resources at the same frequency resource location, thereby improving the channel estimation accuracy for the corresponding frequency resource location when receiving SRS at the base station. It can be improved.

In the above embodiment, when [Method 1-3] is used, that is, when N antenna ports are set across a plurality of SRS resources, and some of the N antenna ports are set and transmitted for each SRS resource, the terminal The following operations can be performed by considering the definitions of startPosition, nrofSymbols, and repetitionFactor, which are upper layer signaling, as follows.

[Time resource operation 3-1]

The terminal can set the total number of symbols for which a plurality of SRS resources are transmitted to N _s of each SRS resource. If n SRS resources are each transmitted in m symbols, N _s may be n*m, and N _s within each SRS resource may be set to the same value. If the terminal is configured with N antenna ports for each of a plurality of SRS resources or N/n antenna ports (in this case, n may be a divisor of N), among the N antenna ports for each SRS resource, In the case where some are transmitted, if it is assumed that M (M may be less than or equal to m) symbols are required for each SRS resource in order for all N antenna ports to be transmitted (i.e., for N antenna ports to be transmitted) A total of n*M OFDM symbols are required), and the terminal can expect to receive N _s set with n, m, and M as divisors for each SRS resource.

For example, if the terminal receives two SRS resources capable of representing N = 8 antenna ports and transmits m = 2 symbols for each SRS resource, the terminal divides m = 2 for each of the plurality of SRS resources. N _s = 1 of 2, 4, 8, 10, 12, 14 can be set. If N _s is 4, the total number of symbols through which multiple SRS resources are transmitted is 4, and some 4 of a total of 8 antenna ports (for example, SRS antenna ports 0 to 0) are connected to the first SRS resource of the two SRS resources. If 3) is set, SRS resource (first SRS resource) is transmitted in the first and third symbols, and another 4 of a total of 8 antenna ports (for example, SRS antenna ports 4 to 7) are sent to the second SRS resource. If is set, SRS resource (second SRS resource) can be expected to be transmitted in the second and fourth symbols. In another method, the terminal transmits the first SRS resource in the first two symbols through some 4 of a total of 8 antenna ports (for example, SRS antenna ports 0 to 3), and another 4 of a total of 8 antenna ports. It can be expected that the second SRS resource will be transmitted in the remaining two symbols through SRS antenna ports 4 to 7 (for example, SRS antenna ports 4 to 7). (The present disclosure may not be limited to the above-described example, and as another example, it may not be excluded that some 4 of the total 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.)

The terminal may assume that the definition of R means the number of consecutive symbols having frequency resources at the same location where the corresponding SRS resource is transmitted as before. Therefore, as described above, the R value that can be set by the terminal may be a divisor of N _s . At this time, if a plurality of SRS resources are configured with N antenna ports or N/n antenna ports are configured for each SRS resource (in this case, n may be a divisor of N), each SRS resource receives N antenna ports. When transmitting an SRS resource through some of the antenna ports, assume that M (M may be less than or equal to m) symbols are required for each SRS resource to transmit the SRS resource through all N antenna ports. (i.e., a total of n*M OFDM symbols), the minimum value of R may be 1 or M.

- If the minimum value of R that the terminal can set is 1, it means that the number of consecutive symbols with the same frequency resource is 1. In this case, in one symbol, only some of the N antenna ports are transmitted. Therefore, for each group of certain antenna ports (transmitted in a specific symbol) among the N antenna ports, the SRS corresponding to the corresponding antenna ports may be transmitted at different frequency positions. Therefore, since SRSs corresponding to all N antenna ports cannot be transmitted at the same frequency location, when the base station receives the corresponding SRS and performs channel estimation, channel information for a specific antenna port may be absent at some frequency resource locations. Therefore, the base station may need to use the frequency location where channel information exists to estimate channel information at the frequency location where channel information does not exist. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

- If the minimum value of R that can be set by the terminal is M, it means that the number of consecutive symbols with the same frequency resource is M, and in this case, considering n SRS resources, a total of n*M symbols Since all N antenna ports can be transmitted, SRSs corresponding to N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- The minimum value of R that the terminal can receive is 1 or M, which is set by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, or activated/deactivated through MAC-CE signaling. Alternatively, it may be defined and operated within the standard.

Based on the time resource operation 3-1, the UE performs the following operations or a partial combination thereof according to the combination of startPosition, nrofSymbols, and repetitionFactor, which are upper layer signaling, for periodic/semi-persistent/aperiodic SRS transmission. It can be done.

- The UE can have N _s set to 2, 4, 8, 10, 12 or 14 for aperiodic SRS, R can be set to 1 or M, M can be a divisor of N _S , and the frequency When performing hopping, only frequency hopping within a slot may be possible, and when performing frequency hopping, the number of consecutive symbols having frequency resources at the same location may be 1 or M (=R). Determination of the R value can follow one of the methods described above.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 1. In this case, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at a different frequency location. That is, because SRSs corresponding to all N antenna ports cannot be transmitted at the same frequency location, when the base station receives the corresponding SRS and performs channel estimation, channel information for a specific antenna port may be absent at some frequency resource locations. The base station may need to use a frequency location where channel information exists to estimate channel information at a frequency location where channel information does not exist. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is M. In this case, SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, so all N antenna ports are performed at the same frequency location. The SRS corresponding to may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- For aperiodic SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4, and R can be set to a value greater than or equal to 2 or a value greater than or equal to M. In this case, R or M may be a divisor of N _s , and when performing frequency hopping, only frequency hopping within a slot may be possible. When performing frequency hopping, the number of consecutive symbols having frequency resources at the same location may be R. there is.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 2. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, it corresponds to all N antenna ports at the same frequency location. SRS can be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 4. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and the channel at the base station by repeated transmission of the SRS is determined by the R value. Improvements in estimation performance may also be possible.

- For periodic/semi-persistent SRS, the UE can have N _s set to n*M (i.e., m=M), R can be set to M, and when performing frequency hopping, frequency hopping between slots. This may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same location may be M (=R).

■ By configuring the above-mentioned upper layer signaling to the terminal, the base station minimizes time resource consumption despite periodic SRS transmission, and corresponds to different antenna ports for M symbols by sending SRS for all N antenna ports. By dividing into SRS transmissions, more power allocation gain per port and more multiplexing gain with SRS transmissions of other terminals can be obtained.

- For periodic/semi-persistent SRS, the terminal can have N _s , which is upper layer signaling, set to a value greater than or equal to 4, and R can be set to a value greater than or equal to 2 or a value greater than or equal to M, At this time, R or M may be a divisor of N _s , and when performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, the number of consecutive symbols having frequency resources at the same location. There can be R numbers.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 2. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 4. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and the channel at the base station by repeated transmission of the SRS is determined by the R value. Improvements in estimation performance may also be possible.

- For periodic/semi-persistent SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 4, and R can be set to a value equal to N _s . When performing frequency hopping, inter-slot Frequency hopping may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same location may be R (=N _s ).

■ The base station sets the corresponding upper layer signaling to the terminal, allowing the terminal to perform repeated transmission using a plurality of time resources at the same frequency resource location, thereby improving the channel estimation accuracy for the corresponding frequency resource location when receiving SRS at the base station. It can be improved.

[Time resource operation 3-2]

The terminal can set the number of symbols through which each of a plurality of SRS resources is transmitted to N _s of each SRS resource. If the terminal receives N antenna ports or N/n antenna ports for each of n SRS resources and transmits the SRS resource through some of the N antenna ports for each SRS resource, if all N antenna ports Assuming that M symbols are required for each SRS resource to transmit the SRS resource through , the terminal can expect all SRS resources to be transmitted through N antenna ports in a total of M*N _s symbols.

For example, if the terminal receives n = 2 SRS resources that can represent N = 8 antenna ports and each SRS resource is transmitted through 4 antenna ports in N _s = 2 symbols, the terminal receives multiple SRS For each resource, N _s can be set to one of 1, 2, 4, 5, 6, or 7. At this time, if N _s is 2, the total number of symbols for which two SRS resources are transmitted is 4, and some 4 of a total of 8 antenna ports (for example, SRS antenna port 0) are connected to the first SRS resource of the two SRS resources. to 3) are set, an SRS resource (first SRS resource) is transmitted in the first and third symbols, and another 4 of a total of 8 antenna ports (for example, SRS antenna ports 4 to 7) are transmitted to the second SRS resource. ) is set, an SRS resource (second SRS resource) can be expected to be transmitted in the second and fourth symbols. In another method, the terminal transmits the first SRS resource in the first two symbols through some 4 of a total of 8 antenna ports (for example, SRS antenna ports 0 to 3), and another 4 of a total of 8 antenna ports. It can be expected that the second SRS resource will be transmitted in the remaining two symbols through SRS antenna ports 4 to 7 (for example, SRS antenna ports 4 to 7). (The present disclosure may not be limited to the above-described example, and as another example, it may not be excluded that some 4 of the total 8 antenna ports are configured as SRS antenna ports 0, 2, 4, and 6.)

The terminal may assume that the definition of R means the number of consecutive symbols having frequency resources at the same location where the corresponding SRS resource is transmitted as before. Therefore, as described above, the R value that can be set by the terminal may be a divisor of N _s . At this time, if the terminal receives N antenna ports or N/n antenna ports for each of n SRS resources, and some of the N antenna ports are transmitted for each SRS resource, if all N antenna ports are Assuming that M OFDM symbols are required for each SRS resource to be transmitted, the minimum value of R may be 1 or M.

- If the minimum value of R that can be set by the terminal is 1, it means that the number of consecutive symbols with the same frequency resource is 1, and in this case, one symbol (transmitted from a specific symbol) among N antenna ports Since only some antenna ports can be transmitted, SRSs corresponding to the antenna ports for each group of certain antenna ports among the N antenna ports may be transmitted at different frequency positions. Therefore, since SRSs corresponding to all N antenna ports cannot be transmitted at the same frequency location, when the base station receives the corresponding SRS and performs channel estimation, channel information for a specific antenna port may be absent at some frequency resource locations. Therefore, the base station may need to use the frequency location where channel information exists to estimate channel information at the frequency location where channel information does not exist. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

- If the minimum value of R that the terminal can set is M, it means that the number of consecutive symbols with the same frequency resource is M, and in this case, all N antenna ports can be transmitted during the M symbols. Therefore, SRS corresponding to N antenna ports can be transmitted at the same frequency location. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- The minimum value of R that the terminal can receive is 1 or M, which is set by upper layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, or activated/deactivated through MAC-CE signaling. Alternatively, it may be defined and operated within the standard.

Based on the time resource operation 3-2, the UE performs the following operations or some combination of them according to the combination of startPosition, nrofSymbols, and repetitionFactor, which are upper layer signaling, for periodic/semi-persistent/aperiodic SRS transmission. It can be done.

- The UE can have N _s set to 1, 2, 4, 5, 6, or 7 for aperiodic SRS, and R can be set to 1 or M. When performing frequency hopping, only frequency hopping within a slot is performed. This may be possible, and when frequency hopping is performed, the number of consecutive symbols having frequency resources at the same location may be 1 or M (=R). Determination of the R value can follow one of the methods described above.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 1. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location and SRS transmission is performed for the remaining part of the total N antenna ports at a different frequency location, the SRS corresponding to all N antenna ports is the same. Since it cannot be transmitted at a frequency location, when the base station receives the corresponding SRS and performs channel estimation, the channel information of a specific antenna port may be absent at some frequency resource locations, so the base station determines the frequency location where the channel information exists. It may be necessary to estimate channel information at a frequency location where channel information does not exist. In this case, the frequency band of SRS transmission that the base station can estimate may be widened, but channel estimation performance may deteriorate at a frequency location where channel information for a specific antenna port is absent.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 2. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

- For aperiodic SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 2 (=1 of 2, 4, 5, 6, and 7), and set R to a value greater than or equal to 2. Alternatively, it can be set to a value greater than or equal to M. When performing frequency hopping, only frequency hopping within a slot may be possible. When performing frequency hopping, the number of consecutive symbols with frequency resources at the same location is R. You can.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 2. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 4. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations, and the channel at the base station by repeated transmission of the SRS is determined by the R value. Improvements in estimation performance may also be possible.

- The terminal can have N _s set to 1 and R set to 1 for periodic/semi-persistent SRS, and when performing frequency hopping, only frequency hopping between slots may be possible. The number of consecutive symbols having frequency resources at the same location may be R.

■ By configuring the above-mentioned upper layer signaling to the terminal, the base station minimizes time resource consumption despite periodic SRS transmission, and corresponds to different antenna ports for M symbols by sending SRS for all N antenna ports. By dividing into SRS transmissions, more power allocation gain per port and more multiplexing gain with SRS transmissions of other terminals can be obtained.

- For periodic/semi-persistent SRS, the UE can set N _s , which is upper layer signaling, to a value greater than or equal to 2 (=1 of 2, 4, 5, 6, 7), and R is greater than 2 or It can be set to the same value or a value greater than or equal to M. When performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, consecutive symbols with frequency resources at the same location are used. The number may be R.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 2. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for N antenna ports can be obtained at all SRS transmission frequency locations. In this case, the frequency band of SRS transmission that the base station can estimate is smaller than when the minimum value of R is 1, but channel estimation performance can be improved because all antenna ports are transmitted at all SRS transmission frequency locations.

■ If n (the number of SRS resources required for SRS transmission for a total of N antenna ports) is 2, m (the number of OFDM symbols through which SRS resources are transmitted) is 2, and M (each SRS out of a total of N antenna ports) is 2, Consider the case where (number of OFDM symbols required for SRS transmission for N/n antenna ports set in resource) is 2 and R is 4. Since SRS transmission is performed for some of the total N antenna ports at a specific frequency location, and SRS transmission is performed for the remaining part of the total N antenna ports at this frequency location, SRS transmission is performed for all N antenna ports at the same frequency location. The corresponding SRS may be transmitted. Therefore, when the base station receives the corresponding SRS and performs channel estimation, channel information for all N antenna ports can be obtained at all SRS transmission frequency locations, and the R value determines the Channel estimation performance may also be improved.

- The UE can set N _s , which is upper layer signaling, to a value greater than or equal to 2 (=1 of 2, 4, 5, 6, 7) for periodic/semi-persistent SRS, and set R to M*N _s. It can be set to the same value, and when performing frequency hopping, frequency hopping within a slot or between slots may be possible. When performing frequency hopping, the number of consecutive symbols with frequency resources at the same location is R (=M *N _s ).

■ The base station sets the corresponding upper layer signaling to the terminal, allowing the terminal to perform repeated transmission using a plurality of time resources at the same frequency resource location, thereby improving the channel estimation accuracy for the corresponding frequency resource location when receiving SRS at the base station. It can be improved.

Whether the terminal can support a combination of at least one of the above-mentioned [Time Resource Operation 2-1], [Time Resource Operation 2-2], [Time Resource Operation 3-1], and [Time Resource Operation 3-2]. can be reported to the base station through terminal capabilities. The corresponding terminal capability report may be reported differently depending on the frequency range (FR), and may be reported by band, band combination, feature set, and feature set per CC. Additionally, the above-described terminal capabilities may each be independent terminal capabilities, or support for each method may be defined as a plurality of components within a single terminal capability.

The terminal receives a higher priority from the base station for at least one combination of the above-described [Time resource operation 2-1], [Time resource operation 2-2], [Time resource operation 3-1], and [Time resource operation 3-2]. It may be set by layer signaling, indicated by L1 signaling, notified by a combination of upper layer signaling and L1 signaling, activated/deactivated through MAC-CE signaling, or defined and operated within the standard.

Figure 11 is a diagram showing the operation of a terminal for SRS transmission according to an embodiment of the present disclosure.

The terminal can report its capabilities to the base station (1100). The terminal capability report may be a combination of at least one of the terminal capabilities mentioned in the above-described embodiment. For example, the terminal capabilities reported by the terminal include support for [Method 1-1] to [Method 1-4], support for [Method 1-3-1] to [Method 1-3-3], [ At least one of the terminal capabilities indicating support for [Time resource operation 2-1], [Time resource operation 2-2], [Time resource operation 3-1], and [Time resource operation 3-2] is included. You can.

Afterwards, the terminal can receive higher layer signaling configuration information from the base station (1105). Higher layer signaling may be a combination of at least one of the upper layer signaling configuration information mentioned in the above-described embodiment. For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time resource operation 3-1], and [Time resource operation 3-2] may be related higher layer signaling for at least one or more of them.

The terminal may additionally receive MAC-CE and/or L1 signaling from the base station (1110). For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time Resource Operation 3-1], and [Time Resource Operation 3-2] may be related MAC-CE and/or L1 signaling for at least one or more of them. The UE may transmit an SRS with N antenna ports based on instructions from the base station received through the above-described higher layer signaling and MAC-CE and/or L1 signaling (1115).

Each step described in FIG. 11 may be performed by changing its order, adding other steps, or omitting the described steps.

Figure 12 is a diagram showing the operation of a base station for SRS reception according to an embodiment of the present disclosure.

The base station can receive terminal capabilities from the terminal (1200). The terminal capability report may be a combination of at least one of the terminal capabilities mentioned in the above-described embodiment. For example, the terminal capabilities reported by the terminal include support for [Method 1-1] to [Method 1-4], support for [Method 1-3-1] to [Method 1-3-3], [ At least one of the terminal capabilities indicating support for [Time resource operation 2-1], [Time resource operation 2-2], [Time resource operation 3-1], and [Time resource operation 3-2] is included. You can.

Afterwards, the base station may transmit higher layer signaling configuration information to the terminal (1205). Higher layer signaling may be a combination of at least one of the upper layer signaling configuration information mentioned in the above-described embodiment. For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time resource operation 3-1], and [Time resource operation 3-2] may be related higher layer signaling for at least one or more of them.

The base station may additionally transmit MAC-CE and/or L1 signaling to the terminal (1210). For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time Resource Operation 3-1], and [Time Resource Operation 3-2] may be related MAC-CE and/or L1 signaling for at least one or more of them. The base station can receive an SRS with N antenna ports transmitted by the terminal based on information indicated through the above-described higher layer signaling and MAC-CE and/or L1 signaling (1215).

Each step described in FIG. 12 may be performed by changing its order, adding other steps, or omitting the described steps.

<Example 2-1: 8-port SRS power control method>

As an embodiment of the present disclosure, a power control method of an 8-port SRS will be described. This embodiment can operate in combination with other embodiments.

If the terminal transmits an SRS with N antenna ports based on [Method 1-2], a single SRS resource can be set from the base station, and time division multiplexing (time domain multiplexing) can be performed using upper layer signaling in the corresponding SRS resource. When using the TDM) type SRS antenna port mapping method, the number of SRS antenna ports to be transmitted by the terminal in each symbol may be less than or equal to N, and the symbols required to transmit SRS resources through all N antenna ports The number may be greater than or equal to 1. For example, if the UE receives an SRS resource of N = 8 as upper layer signaling from the base station, and the TDM-type SRS antenna port mapping method is set within the SRS resource, the UE uses 2 symbols to connect 8 antenna ports. SRS transmission can be performed through, and the terminal performs SRS transmission corresponding to 4 antenna ports in the first symbol, and in the second symbol, SRS transmission is performed on the remaining 4 antenna ports, which are different from the 4 antenna ports of the first symbol. Corresponding SRS transmission can be performed.

If the terminal has not configured the TDM method for a specific SRS resource of N=8, the terminal can perform the following operation.

- The terminal can perform SRS transmission corresponding to all eight antenna ports in each symbol among all symbols configured for SRS transmission.

- The terminal divides the SRS transmission power in dBm units determined through Equation 4 below into a linear scale (for example, in mW or W units) by N = 8, which is the total number of antenna ports, and calculates the The transmission power of SRS can be determined.

If the terminal receives the TDM method for a specific SRS resource of N=8, the terminal can perform the following operations.

- The terminal can perform SRS transmission corresponding to four different antenna ports using two consecutive symbols among all symbols set for SRS transmission.

- The terminal divides the SRS transmission power in dBm determined through equation 4 below into a linear scale (for example, in mW or W) by 4, which is the number of SRS antenna ports set for each symbol, and transmits the power to each antenna. The transmission power of SRS per port can be determined. This operation can be performed even when the SRS transmission power is determined through Equation 2 or Equation 3.

- If the terminal reports a specific terminal capability, the terminal converts the SRS transmission power in dBm determined through Equation 4 below into a linear scale (for example, in mW or W units) to the SRS set for each symbol. By dividing by 4, which is the number of antenna ports, the SRS transmission power for each antenna port can be determined. At this time, the specific terminal capability is the maximum transmission power of the terminal for each symbol (for example, in Equation 4 below)

) may be used to transmit an SRS (or uplink signal), which may mean that the terminal can reach its maximum transmission power within one symbol with only four antenna ports.

■ For example, if the terminal is equipped with one power amplifier (PA) for each of eight transmit antennas, and the maximum output of each PA is 14dBm,

is 23dBm, the maximum power value when the terminal uses 8 antenna ports in one symbol

SRS can be transmitted using the value of 23dBm. However, in the case of an SRS resource with the TDM method set as above, if the terminal transmits SRS using only 4 antenna ports in one symbol, the terminal can use up to 20dBm as the maximum power value using 4 PAs,

cannot reach 23dBm. For these terminals, the terminal capabilities cannot be reported.

● In the case of such a terminal, the terminal cannot receive TDM-type SRS resources from the base station, and can receive SRS resources in a way that the SRS corresponding to all non-TDM antenna ports is transmitted in each symbol.

● Alternatively, in the case of such a terminal, the terminal receives a TDM-type SRS resource from the base station, and Equation 4 below can be modified as Equation 2 or Equation 3 according to the PA output of the terminal. If the terminal uses only 4 antenna ports in one symbol,

If the value cannot be reached, the terminal uses Equation 2 below:

By multiplying by a specific coefficient a ₁ having a value between 0 and 1 (or by adding a specific constant a ₂ in dB as in Equation 3 below), the maximum value of the SRS transmission power that can be determined through Equation 4 below is

Transmission power can be limited to a smaller value. In addition, as shown in Equation 2 below,

The limited SRS maximum transmission power value determined by multiplying by a specific coefficient a ₁ having a value between 0 and 1 (or by adding a specific constant a ₂ in dB units as shown in Equation 3 below) is determined when the terminal uses only 4 antenna ports in one symbol. It can mean the maximum power value that can be reached using . For example, if the terminal has the output of each of 8 PAs at a maximum of 14dBm as described above,

If is 23dBm, the terminal can have a transmission power value of up to 20dBm using 4 antenna ports in one symbol, which is

Since it is half the contrast, in Equation 2 below, a ₁ can be 20/23, or in Equation 3 below, a ₂ can be -3 dB. Such a ₁ or a ₂ can be reported as a terminal capability. Based on the corresponding terminal capabilities, the base station can set upper layer signaling to the terminal to determine the a ₁ or a ₂ value that the terminal will actually use in Equation 2 or Equation 3, or without additional upper layer signaling from the base station, Based on the UE capability value reported by the UE, both the base station and the UE may consider that the transmission power of the SRS is determined based on Equation 2 or Equation 3.

[Equation 2]

[Equation 3]

■ As another example, if the terminal is equipped with one PA for each of eight transmit antennas, and the maximum output of each PA is different (as an example, the PAs of the first to fourth transmit antennas are each The maximum output is 17dBm, and the PAs of the 5th to 8th transmission antennas each have a maximum output of 14dBm). Depending on which combination of transmission antennas the UE uses to transmit SRS corresponding to the 4 antenna ports, the maximum transmission power value for each symbol may be different during TDM operation for 8-port SRS transmission. For example, when the UE performs a TDM operation for 8-port SRS transmission, the UE uses the 1st to 4th transmit antennas in the first symbol, and uses the 5th to 8th transmit antennas in the second symbol. When used, the terminal can have a transmission power of up to 23 dBm in the first symbol and a transmission power of up to 20 dBm in the second symbol. As another example, when the UE operates TDM for 8-port SRS transmission, the first symbol uses the first transmission antenna, the second transmission antenna, the fifth transmission antenna, and the sixth transmission antenna, and the second symbol uses the first transmission antenna, the second transmission antenna, and the sixth transmission antenna. When using the 3 transmission antenna, the 4th transmission antenna, the 7th transmission antenna, and the 8th transmission antenna, the terminal can have a maximum transmission power of 21.77dBm in both the first symbol and the second symbol.

● For these terminals, that is, when transmitting 8-port SRS in TDM method, the maximum transmission power when transmitting SRS through 4 antenna ports in at least one symbol is

If it is smaller than that, the terminal cannot receive TDM-type SRS resources from the base station and can receive SRS resources in a way that the SRS corresponding to all non-TDM antenna ports is transmitted in each symbol.

● Alternatively, in the case of these terminals, when the terminal transmits 8-port SRS in TDM method, the maximum transmission power when transmitting SRS through 4 antenna ports is for a specific symbol among the 2 symbols.

It may be equal to , and in the remaining symbols, the maximum transmission power when transmitting SRS through 4 antenna ports is

In the smaller case, that is, when transmitting 8-port SRS in TDM method, the maximum transmission power when transmitting SRS through 4 antenna ports in at least one symbol is

Consider the smaller case. In this case, the terminal can derive the transmission power of SRS using Equation 2 or Equation 3 above, for example, according to the smaller value of the maximum transmission power when transmitting SRS through the four antenna ports in each symbol. there is. For example, in the first symbol as above,

A maximum transmission power equal to is possible, and in the second symbol,

If a smaller maximum transmit power is possible, the terminal

The TDM-based SRS transmission power in two symbols can be determined based on the smaller maximum transmission power. At this time, the SRS transmission power can be determined based on Equation 2 or Equation 3, similar to the above, and the terminal determines a ₁ or a ₂ required for this based on the smaller of the maximum transmission powers possible in the two symbols. It can be reported based on terminal capabilities. Based on the corresponding terminal capabilities, the base station can set upper layer signaling to the terminal to determine the a ₁ or a ₂ value that the terminal will actually use in Equation 2 or Equation 3, or without additional upper layer signaling from the base station, Based on the UE capability value reported by the UE, both the base station and the UE may consider that the transmission power of the SRS is determined based on Equation 2 or Equation 3.

- As another example, if the terminal is equipped with one PA for each of eight transmit antennas, and the maximum output of each PA is 17dBm,

If is 23dBm, the terminal can use up to 23dBm as the maximum power value using 4 PAs if only 4 antenna ports are used in one symbol in the case of an SRS resource with the TDM method set as above.

It can reach 23dBm. In the case of such a terminal, the terminal capabilities can be reported and a TDM-type SRS resource can be set from the base station.

- The operation described above corresponds to an example where the number of antenna ports is 8 and the number of symbols used is 2, and it is also possible to use a different number of symbols and antenna ports than those disclosed. In this case, the content described above can be applied according to obvious modifications.

<Third embodiment: SRS power control method>

As an embodiment of the present disclosure, a method of controlling power during SRS transmission of a terminal according to the SRS resource configuration and indication method described above in the above embodiment will be described.

When the terminal transmits through SRS in response to a power control command received from the base station, a method for the terminal to set and transmit the transmission power of the SRS will be described. The i -th SRS transmission occasion, the SRS power control adjustment state corresponding to the closed loop index l , and the uplink reference signal transmission power of the terminal are expressed in dBm as follows: It can be determined as in Equation 4. In Equation 4 below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be set for each cell c , carrier frequency f , and bandwidth part b , and can be divided into indices b, f, and c .

[Equation 4]

-

: The maximum transmission power available to the terminal in the i-th transmission unit, which is determined by the power class of the terminal, parameters activated from the base station, and various parameters built into the terminal.

- P _{0_SRS,b,f,c} (q _s ): Can be set to p0, which is upper layer signaling, for bandwidth part b, carrier frequency f , and cell c , and SRS resource set q _s is SRS-ResourceSet, which is upper layer signaling. It can be set through and SRS-ResourceSetId.

- μ: Subcarrier interval setting value

- M _SRS,b,f,c (i): This may mean the amount of resources used in the i -th SRS transmission unit (for example, the number of RBs used for SRS transmission on the frequency axis).

- α _SRS,b,f,c (q _s ): Can be set to alpha, which is upper layer signaling, for bandwidth part b, carrier frequency f , and cell c , and SRS resource set q _s is SRS-ResourceSet, which is upper layer signaling. It can be set through and SRS-ResourceSetId.

- PL _b,f,c (q _d ): Pathloss representing the path loss between the base station and the terminal. The terminal receives the transmission power of the reference signal (RS; Reference Signal) resource q _d signaled by the base station and the terminal reception of the reference signal. Calculate pathloss from the difference from the signal level.

-h _b,f,c (i,l): It may mean the SRS power control adjustment status value for the ith SRS transmission unit corresponding to the closed-loop index l within the bandwidth part b , carrier frequency f , and cell c. .

The SRS power control adjustment state can be determined through bandwidth part b , carrier frequency f , cell c , and i -th transmission unit.

- If the UE is set to have the same power control adjustment state value between SRS transmission and PUSCH transmission through srs-PowerControlAdjustmentStates, which is upper layer signaling, the SRS power control adjustment state can be expressed as Equation 9 below, and Equation 5 In , f _b,f,c (i,l) may mean the current PUSCH power control adjustment state, and the value can be substituted into h _b,f,c (i,l).

[Equation 5]

h _b,f,c (i,l) = f _b,f,c (i,l)

- If the terminal is not configured for PUSCH transmission in bandwidth part b , carrier frequency f , and cell c , or is set to have separate power control adjustment state values between SRS transmission and PUSCH transmission through srs-PowerControlAdjustmentStates, which is upper layer signaling. And if tpc-Accumulation, which is upper layer signaling, is not set, the SRS power control adjustment state can be expressed regardless of closed loop l as shown in Equation 6 below.

TPC Command field value	Accumulated δ PUSCH,b,f,c or δ SRS,b,f,c [dB] (If tpc-Accumulation is not set)
0	-One
One	0
2	One
3	3

[Equation 6]

- δ _SRS,b,f,c (m): This may be a value indicated by the TPC command field included in DCI format 2_3, and the value may follow Table 23 above.

■

may mean the sum of TPC command δ _SRS,b,f,c for all corresponding transmission units within a specific set S _i . At this time, c(S _i ) may mean the number of all elements belonging to the set S _i . S _i may mean a set of DCIs including all TPC command values to perform a TPC command accumulation operation for the i -th PUSCH transmission unit. To determine S _i , a start point and an end point can be defined on the time dimension, and all DCIs received by the terminal within the two points can be included as elements of S _i .

● The end point for determining S _i may be a point K _SRS (i) symbols prior to the start symbol of the ith SRS transmission unit.

● The starting point for determining S _i may be a point K _SRS (ii ₀ )-1 symbols prior to the start symbol of the i - i _0th SRS transmission unit. At this time, i ₀ , a positive integer, is the end point for determining _Si (a point earlier than K _SRS (i) symbols from the start symbol of the i -th SRS transmission unit) is a time point earlier than K _SRS (ii ₀ ) symbols from the start symbol of the i - i _0th SRS transmission unit. It can be determined as the smallest value that satisfies an earlier point in time.

● As an example, the end point for determining S _i can be defined as sym( i ), and the time point as far back as K _SRS (ii ₀ ) symbols from the start symbol of the i - i _0th SRS transmission unit is sym( i - i ₀ ), if sym( i ) = sym( i -1) > sym( i - 2) > sym( i -3), i ₀ can be determined to be 2. there is.

- If the terminal is not configured for PUSCH transmission in bandwidth part b , carrier frequency f , and cell c , or is set to have separate power control adjustment state values between SRS transmission and PUSCH transmission through srs-PowerControlAdjustmentStates, which is upper layer signaling. And when tpc-Accumulation, which is upper layer signaling, is set (i.e., when TPC command accumulation operation cannot be performed and absolute TPC command value can be applied), the SRS power control adjustment state is in closed loop l as shown in Equation 7 below. It can be expressed independently.

TPC Command field value	Absolute δ PUSCH,b,f,c or δ SRS,b,f,c [dB] (If tpc-Accumulation settings are received)
0	-4
One	-One
2	One
3	4

[Equation 7]

h _b,f,c (i) = δ _SRS,b,f,c (i)

δ _SRS,b,f,c (i) may be a value indicated by the TPC command field included in DCI format 2_3 within bandwidth part b , carrier frequency f , and cell c , as described above, and the value is shown in Table 24 above. You can follow. For example, if the value of the TPC command field is 0, δ _SRS,b,f,c may have a value of -4 dB.

As described above, if the terminal can perform the TPC command accumulation operation (i.e., if tpc-Accumulation, which is upper layer signaling, has not been set), the i-th SRS transmission unit within the bandwidth part b, carrier frequency f, and cell c is Various methods can be considered to determine the definition of K _SRS (i) that can be applied, or if TPC command accumulation operation cannot be performed and operates through absolute value (i.e., if tpc-Accumulation, which is upper layer signaling, has been set ), various methods for determining the definition of δ _SRS,b,f,c (i) that can be applied to the i-th SRS transmission unit within the bandwidth part b, carrier frequency f, and cell c can be considered.

[Condition 3-1]

If the terminal receives an instruction to trigger aperiodic SRS transmission through DCI format from the base station

[Condition 3-1-1]

In addition to the above-mentioned condition 3-1, if the terminal can perform a TPC command accumulation operation (i.e., if tpc-Accumulation, which is upper layer signaling, is not configured)

[Method 3-1-1-1] K _SRS (i), which can be applied to the i -th SRS transmission unit, is the value of the i -th SRS transmission unit from the end point of the last symbol that received the PDCCH that triggered the i -th SRS transmission unit. It may mean the symbol length up to the starting point.

- If the terminal receives triggering for the i, i+1, ..., i+N-1th SRS transmission unit through reception of one corresponding PDCCH, i, i+1, ..., i+ The end point of the last symbol of the PDCCH that determines all of K _SRS (i), K _SRS (i+1), ..., K _SRS (i+N-1) that can be applied to the N-1th SRS transmission unit is They can all be the same. Therefore, according to the method described above, the end point (i.e., the end point of the last symbol of the PDCCH) for determining S _i , which is the point K _SRS (i) symbols before the start symbol of the i-th SRS transmission unit, is all the same. , the TPC command accumulation applied value may be the same for all SRS transmission units scheduled for the corresponding PDCCH. In this case, there is an advantage of simplifying the operation of the UE by applying the power control value that can be determined at the time of PDCCH triggering to all SRS transmission units, but SRS transmission is transmitted relatively later in time. It can be said to be an inflexible method in that dynamic power control through L1 signaling (e.g. DCI format 2_3) is not possible for the unit.

[Method 3-1-1-2] K _SRS (i) that can be applied to the i -th SRS transmission unit is from the end point of the last symbol that received the PDCCH that triggered the i-th SRS transmission unit, all triggering by the PDCCH It may refer to the symbol length up to the start point of the SRS transmission unit that is transmitted first in time among SRS transmission units.

- If the UE receives triggering for one SRS transmission unit through reception of one PDCCH, according to method 3-1-1-2, the same K _SRS (i) as method 3-1-1-1 A value can be derived.

- If the terminal receives triggering for the i, i+1, ..., i+N-1th SRS transmission unit through reception of one corresponding PDCCH, i, i+1, ..., i+ K _SRS (i), K _SRS (i+1), ..., K _SRS (i+N-1) that can be applied to the N-1th SRS transmission unit are among all SRS transmission units triggered by the corresponding PDCCH. It may have a value equal to K _SRS (i) that can be applied to the i-th SRS transmission unit transmitted first in time. Therefore, since the end points for determining S _i are all different according to the above, the TPC command accumulation value applied to all SRS transmission units scheduled for the corresponding PDCCH may vary for each SRS transmission unit. In this case, not only the power control value that can be determined at the time of PDCCH triggering, but also dynamic power control through L1 signaling (e.g., DCI format 2_3) for SRS transmission units transmitted relatively later in time. Although terminal operation may become relatively complicated, it can be said to be a flexible method from a power control perspective.

[Method 3-1-1-3] K _SRS (i) applicable to the i -th SRS transmission unit may mean the symbol length set by higher layer signaling.

- If the terminal receives triggering for one SRS transmission unit through reception of one PDCCH, the terminal can receive one symbol length set as higher layer signaling.

- If the terminal receives triggering for the i, i+1, ..., i+N-1th SRS transmission unit through reception of one corresponding PDCCH, i, i+1, ..., i+ K _SRS (i), K _SRS (i+1), ... , K _SRS (i+N-1) that can be applied to the N-1th SRS transmission unit are all the same based on one upper layer signaling value. It may have a value, or it may have each value based on N different upper layer signaling. Therefore, since the end points for determining S _i are all different according to the above, the TPC command accumulation value applied to all SRS transmission units scheduled for the corresponding PDCCH may vary for each SRS transmission unit. Additionally, if method 3-1-1-2 is used, the symbol interval from any PDCCH to the first SRS transmission unit triggered from another PDCCH may not always be the same as the symbol interval from another PDCCH to the first SRS transmission unit triggered. Because K _SRS (i) to be considered from a specific SRS transmission unit may vary depending on different PDCCH triggering, if the value is set by higher layer signaling as in method 3-1-1-3, the UE operation It may have the advantage of being relatively simple and consistently controllable.

- When there is only one upper layer signaling described above

■ For example, the signaling may have a value in symbol units as independent upper layer signaling for TPC command accumulation, and this may be defined as K _SRS,min .

■ As another example, the signaling may be the number of symbols obtained by multiplying the smallest value among all triggering slot offsets k2 or k2-16, which are upper layer signaling set in all TDRA entries, by 14, and this can be defined as K _SRS,min. You can.

■ As another example, the signaling may be the number of symbols obtained by multiplying the smallest value among all SRS triggering slot offset values set in all SRS resource sets by 14, and this can be defined as K _SRS,min .

■ As another example, the signaling may be the number of symbols obtained by multiplying the smallest value among the triggering slot offset k2 set in PUSCH-ConfigCommon, which is upper layer signaling, by 14, and this can be defined as K _SRS,min .

- In case there are multiple upper layer signaling described above

■ As an example, the signaling may have a symbol-level value as a plurality of independent upper layer signaling for TPC command accumulation, and if the number of repeated transmissions is N, this is K _SRS,min,1 , ..., respectively. K can be defined as _SRS,min,N .

■ As another example, the signaling is k2 or k2-16 equal to the number of SRS transmission units triggered by the PDCCH from the smallest value among all triggering slot offsets k2 or k2-16, which are upper layer signaling set in all TDRA entries. Considering this, it can be the number of symbols obtained by multiplying this by 14, and if the number of repeated transmissions is N, it can be defined as K _SRS,min,1 , ..., K _SRS,min,N, respectively.

■ As another example, the signaling considers a slot offset equal to the number of SRS transmission units triggered by the PDCCH from the smallest value among all SRS triggering slot offset values set in all SRS resource sets, and multiplies this by 14 to obtain the number of symbols. It can be, and if the number of repeated transmissions is N, it can be defined as K _SRS,min,1 , ..., K _SRS,min,N, respectively.

■ As another example, the corresponding signaling is a symbol obtained by considering k2 equal to the number of SRS transmission units triggered by the corresponding PDCCH from the smallest value among all triggering slot offsets k2 set in PUSCH-ConfigCommon, which is upper layer signaling, and multiplying this by 14. It can be a number, and if the number of repeated transmissions is N, it can be defined as K _SRS,min,1 , ..., K _SRS,min,N, respectively.

[Method 3-1-1-4] K _SRS (i) that can be applied to the i -th SRS transmission unit is the last symbol that received the PDCCH if the i-th SRS transmission unit is the first SRS transmission unit triggered through the PDCCH It may mean the symbol length from the end point of It may mean the symbol length from the end point of one last symbol to the start point of the i-th SRS transmission unit.

- If the UE receives triggering for one SRS transmission unit through reception of one PDCCH, according to method 3-1-1-4, the same K _SRS (i) as method 3-1-1-1 A value can be derived.

- Method 3-1-1-4 is that if the UE receives triggering for the i, i+1, ..., i+N-1th SRS transmission unit through reception of one corresponding PDCCH, the ith SRS K _SRS (i) that can be applied to the transmission unit is calculated using the PDCCH that scheduled it and the timing of the i-th SRS transmission unit, and can be applied to the i+1, ..., i+N-1th SRS transmission unit. When determining the K _SRS (i+1), ..., K _SRS (i+N-1), the i, ...., i+N-2th SRS transmission unit is preceded by the ith SRS transmission unit. This may be a calculation method that is considered similar to the PDCCH used when calculating K _SRS (i).

[Method 3-1-1-5] K _SRS (i) that can be applied to the i -th SRS transmission unit is the last symbol that received the PDCCH if the i-th SRS transmission unit is the first SRS transmission unit triggered through the PDCCH It may mean the symbol length from the end point of to the start point of the i-th SRS transmission unit, and if the i-th SRS transmission unit is not the first SRS transmission unit triggered through the PDCCH, the It may mean the symbol length from the end point of the nearest downlink symbol to the start point of the i-th transmission unit.

- If the UE receives triggering for one SRS transmission unit through reception of one PDCCH, according to method 3-1-1-5, K _SRS (i) is the same as method 3-1-1-1. A value can be derived.

[Method 3-1-1-6] The terminal selects K _SRS (i) that can be applied to the i -th SRS transmission unit through a combination of the above-described methods 3-1-1-1 to 3-1-1-5. It can be defined. For example, if the UE receives triggering of N repeated i, i+1, ..., i+N-1th SRS transmission units through PDCCH, K for the ith SRS transmission unit, which is the first of them, Method 3-1-1-1 is used to define _SRS (i), and K _SRS (i+1), for the remaining i+1, ..., i+N-1th SRS transmission unit. .. , method 3-1-1-2 can be used for K _SRS (i+N-1).

[Method 3-1-1-7] The terminal defines K _SRS (i) by configuring one of the above-described methods 3-1-1-1 to 3-1-1-6 from the base station through upper layer signaling. It can be used in this way. For example, the terminal may receive a setting called tpcAccumulationTimeDetermination , which is upper layer signaling, from the base station, and the corresponding upper layer signaling may be set to one of scheme1 to scheme6 , and scheme1 to scheme6 are each set to method 3-1-1-1 described above. It may mean 3-1-1-6. The present invention is not limited to this example, and it is also possible for some of the described methods to be used for method 3-1-1-7.

[Method 3-1-1-8] The terminal can receive upper layer signaling from the base station, which indicates whether to use the method for defining K _SRS (i) (e.g. enableTPCAccumulationTimeDetermination ), and if the upper layer signaling If this is not set, it means that K _SRS (i) is defined using one of the above-described methods 3-1-1-1 to 3-1-1-6 (for example, method 3-1-1-1). It may have, and if the corresponding upper layer signaling is set (for example, if the terminal receives a setting value of on), it may mean that the use of a specific K _SRS (i) definition method is possible. At this time, the specific K _SRS (i) definition method is one of the above-described methods 3-1-1-1 to 3-1-1-6 excluding the method used when the corresponding upper layer signaling is not set (e.g. For example, it may be method 3-1-1-6). The present invention is not limited to this example, and it is also possible for some of the described methods to be used for method 3-1-1-8.

[Method 3-1-1-1] to [Method 3-1-1-8] described above may be applied to the UE operation method in all time dimensions of SRS transmission. For example, the above-described [Method 3-1-1-1] to [Method 3-1-1-8] may be applied to all periodic, semi-permanent, and aperiodic SRS transmission. In addition, some of the above-described [Method 3-1-1-1] to [Method 3-1-1-8] may be applied only to some time dimension operations, and others may be applied only to some of the remaining time dimension operations. . For example, the above-described [Method 3-1-1-3] can be applied to periodic and semi-permanent SRS transmission, and [Method 3-1-1-1] can be applied to aperiodic SRS transmission.

[Condition 3-1-2]

In addition to the above-mentioned condition 3-1, if the terminal cannot perform the TPC command accumulation operation and operates through an absolute value (i.e., when tpc-Accumulation, which is upper layer signaling, is set)

[Method 3-1-2-1] δ _SRS,b,f,c (i) triggers the i -th SRS transmission unit corresponding to the closed-loop index l within the bandwidth part b , carrier frequency f , and cell c . It may be the TPC command field value included in the PDCCH.

- According to the method, if the UE receives triggering for one SRS transmission unit through reception of one PDCCH, or if the terminal receives triggering for multiple SRS transmission units through reception of one PDCCH, all SRS are transmitted. The same absolute TPC command value can be applied to each unit.

- According to the method, if the terminal receives triggering for multiple SRS transmission units through reception of one PDCCH, δ _SRS,b,f,c (i) is only the TPC command field included in the triggered PDCCH Because it follows the value, the value of the TPC command field included in DCI format 2_3 may not be applied between the transmission of two SRS transmission units.

[Method 3-1-2-2] δ _SRS,b,f,c (i) is before transmission of the i -th SRS transmission unit corresponding to the closed-loop index l within the bandwidth part b , carrier frequency f , and cell c. It may be the most recently received TPC command value.

- According to the method, the UE receives triggering for one SRS transmission unit through reception of one PDCCH, or the UE receives triggering for multiple SRS transmission units through reception of one PDCCH, or all SRS transmissions. If there is no DCI format 2_3 transmitted more recently than the triggering PDCCH for the unit, the absolute TPC command value included in the triggering PDCCH may be applied equally to all SRS transmission units.

- According to the method, when the terminal receives triggering for a plurality of SRS transmission units through reception of one PDCCH, if DCI format 2_3 is received between transmission of the i-th and i+1-th SRS transmission units and the i-th If the most recently received TPC command value from the SRS transmission unit is the value indicated through the TPC command field included in the triggering PDCCH, the absolute TPC command value applied to the ith SRS transmission unit is the value indicated by the triggering PDCCH. can be followed, and for the i+1th SRS transmission unit, the absolute TPC command value included in DCI format 2_3 can be applied.

[Method 3-1-2-3] δ _SRS,b,f,c (i) is greater than the transmission of the i -th SRS transmission unit corresponding to the closed-loop index l within the bandwidth part b , carrier frequency f , and cell c . K _SRS (i) It may be the most recently received TPC command value from a point in time previous to the symbol.

- To define K _SRS (i), one of the above-described methods 3-1-1-1 to 3-1-1-8 can be applied.

The above-mentioned SRS transmission unit is each SRS transmission symbol, a plurality of SRS transmission symbols, a set of all symbols corresponding to a specific SRS resource, or a set of all symbols corresponding to all SRS resources to be used for SRS transmission for all defined ports. It can be one of the following, and the terminal can be configured with upper layer signaling from the base station, activated through MAC-CE, instructed through L1 signaling, notified through a combination of upper layer signaling and L1 signaling, or configured according to the standard. It can follow what is fixedly defined by .

The above-described SRS transmission unit may have the same definition or different definitions according to the above-described [Method 1-1] to [Method 1-4]. For example, if the terminal transmits an SRS containing more than 8 ports to the base station using [Method 1-1], the base station and the terminal transmit a set of all symbols corresponding to a specific SRS resource as an SRS transmission unit. It can also be used, and if the terminal transmits an SRS containing the number of ports of 8 or more ports to the base station using [Method 1-2], the base station and the terminal can express each SRS transmission symbol or the number of ports of 8 or more ports. A plurality of SRS transmission symbols can be used as an SRS transmission unit, and if the terminal transmits an SRS containing 8 or more ports to the base station using [Method 1-3], the base station and the terminal transmit a specific SRS A set of all symbols corresponding to a resource, or a set of all symbols corresponding to all SRS resources to be used to transmit all defined ports, may be used as an SRS transmission unit. This is only an example, and for all [Method 1-1] to [Method 1-4], it may have an SRS transmission unit such as a set of all symbols corresponding to a specific SRS resource, and for each method, unlike the above example, each SRS It may also be possible to use transmission units.

If the terminal receives TCIState or UL-TCIstate in dl-OrJoint-TCIStateList, which is upper layer signaling,

- If the terminal receives p0AlphaSetforSRS, which is upper layer signaling,

■ If the terminal receives followUnifiedTCIstateSRS, which is upper layer signaling, within the SRS resource set, the terminal receives p0 (e.g., P _{0_SRS,b,f,c} (q _s ) in [Equation 8]), alpha (e.g., Equation 8) α _SRS,b,f,c (j)) within 4, and SRS power control adjustment state l values can be provided based on p0AlphaSetforSRS , which is upper layer signaling associated with the TCIState or UL-TCIstate indicated by the base station, and path attenuation The reference signal, q _d , may be associated with the TCIState or UL-TCIstate indicated from the base station, or may be provided based on pathlossReferenceRS-Id-r17, which is included upper layer signaling.

■ If the terminal does not set followUnifiedTCIstateSRS, which is upper layer signaling, in the SRS resource set, the terminal has p0 (e.g., P _{0_SRS,b,f,c} (q _s ) in Equation 4), alpha (e.g., Equation 4) α _SRS,b,f,c (j)), and the SRS power control adjustment state l values are based on p0AlphaSetforSRS, which is upper layer signaling associated with the TCIState or UL-TCIstate set in the SRS resource of the lowest index in the corresponding SRS resource set. It can be provided as, and the path loss reference signal, q _d , is associated with the TCIState or UL-TCIstate set in the SRS resource of the lowest index in the corresponding SRS resource set, or based on the included upper layer signaling, pathlossReferenceRS-Id-r17. It can be provided.

If the terminal has not set TCIState or UL-TCIstate in dl-OrJoint-TCIStateList , which is upper layer signaling, the terminal is p0 (for example, P _{0_SRS,b,f,c} (q _s ) in Equation 4), alpha ( For example, α _SRS,b,f,c (j)) in Equation 4, and q _d , the path loss reference signal, can be provided based on p0, alpha, and pathlossReferenceRS, which are upper layer signaling within the corresponding SRS resource set.

As described above, the terminal receives one p0, alpha, and path attenuation reference signal information for each SRS resource set from the base station, regardless of whether TCIState or UL-TCIstate in dl-OrJoint-TCIStateList , which is upper layer signaling, is set. As shown, notification can be received through a combination of upper layer signaling and L1 signaling. In this case, since one path attenuation reference signal can be used for each SRS resource set, even if multiple TRPs exist in a specific cell, the path attenuation for only one TRP through which the path attenuation reference signal is transmitted could be offset.

Meanwhile, according to the evolving 5G NR standard, downlink data transmission through multiple synchronized TRPs can be supported in a TDD environment to support higher transmission efficiency. At this time, in order to obtain channel information between the terminal and each TRP from the base station, the terminal may transmit an SRS toward the base station. At this time, if based on the existing SRS power control method, one SRS resource for all SRS resources in each SRS resource set Path attenuation offset may be possible only for a specific TRP that transmits a path attenuation reference signal, and if the UE wishes to transmit SRS while offsetting path attenuation for different TRPs, transmission of multiple SRS resource sets may be necessary. In this case, SRS transmission overhead may increase.

Figure 13 is a diagram showing the SRS reception power for each TRP according to the location of the terminal in network cooperative communication according to an embodiment of the present disclosure.

In a 5G network in which a base station consisting of TRP1 (1300) and TRP2 (1301) supports cooperative communication, consider a situation where terminal 1 (1302), terminal 2 (1303), and terminal 3 (1304) receive 5G service support from the base station. do. Terminal 1 (1302) exists relatively close to TRP1 (1300), and Terminal 2 (1303) exists between TRP1 (1300) and TRP2 (1301), and the distance from TRP2 (1301) is TRP1 (1300). It exists closer than the distance from and Terminal 3 (1304) exists relatively close to TRP2 (1301).

Since Terminal 1 (1302) is located closer to TRP1 (1300) than TRP2 (1301), the path attenuation reference signal in the SRS resource set received through upper layer signaling from the base station may be transmitted from TRP1 (1300). can support uplink and downlink transmission and reception with Terminal 1 (1302) using only TRP1 (1300), and may not use TRP2 (1301). Accordingly, Terminal 1 (1302) adjusts the transmission power to offset the amount of path attenuation based on the path attenuation reference signal transmitted by TRP1 (1300), so that TRP1 (1300) for the transmission signal of Terminal 1 (1302) The received power strength (1312, 1322) can satisfy the received power requirements (1311, 1321) for uplink signal reception in TRP1 (1300).

Meanwhile, when the signal of Terminal 1 (1302) is received at TRP2 (1301), which is located further away from Terminal 1 (1302) than TRP1 (1300), the transmission power of Terminal 1 (1302) is transmitted between Terminal 1 (1302) and TRP2. Since the amount of path attenuation between (1301) cannot be offset, the strength (1317, 1327) of the received power at TRP2 (1301) for the transmitted signal of Terminal 1 (1302) is the reception power for the uplink signal received at TRP2 (1301). Power requirements (1316, 1326) cannot be met.

Since Terminal 3 (1304) is located closer to TRP2 (1301) than TRP1 (1300), the path attenuation reference signal in the SRS resource set received through upper layer signaling from the base station may be transmitted from TRP2 (1301). can support uplink and downlink transmission and reception with Terminal 3 (1304) using only TRP2 (1301), and may not use TRP1 (1300). Therefore, Terminal 3 (1304) adjusts the transmission power to offset the amount of path attenuation based on the path attenuation reference signal transmitted by TRP2 (1301), and adjusts the transmission power in TRP2 (1301) for the transmission signal of Terminal 3 (1304). The intensity of received power (1319, 1329) can satisfy the received power requirements (1316, 1326) for uplink signal reception in TRP2 (1301).

Meanwhile, when receiving a signal from Terminal 3 (1304) at TRP1 (1300), which is located further away from Terminal 3 (1304) than TRP2 (1301), the transmission power of Terminal 3 (1304) is transmitted between Terminal 3 (1304) and TRP1. Since the amount of path attenuation between (1300) cannot be offset, the strength (1314, 1324) of the reception power at TRP1 (1300) for the transmission signal of Terminal 3 (1304) is the reception power for the uplink signal reception at TRP1 (1300). Power requirements (1311, 1321) cannot be met.

Terminal 2 (1303) is located relatively close to TRP2 (1301), but is located between TRP1 (1300) and TRP2 (1301), so the base station uses some or all of TRP1 (1300) and TRP2 (1301) depending on the situation. Using this, uplink and downlink transmission and reception with terminal 2 (1303) can be supported. Therefore, when the terminal performs uplink transmission, the amount of path attenuation is offset based on the path attenuation reference signal transmitted by TRP1 (1300) or TRP2 (1301). The intensity of received power may vary.

- If Terminal 2 (1303) adjusts the transmission power to offset the path attenuation amount based on the path attenuation reference signal transmitted by TRP1 (1300) (1310), TRP1 (1310) for the transmission signal of Terminal 2 (1303) The intensity of received power 1313 at 1300 may satisfy the received power requirement 1316 for uplink signal reception at TRP1 1300. At the same time, when receiving a signal from Terminal 2 (1303) at TRP2 (1301), which is located closer to Terminal 2 (1303) than TRP1 (1300) (1315), the transmission power of Terminal 2 (1303) is Terminal 2 (1303). Since the amount of path attenuation between 1303) and TRP2 (1301) can be offset, the strength of the received power (1318) at TRP2 (1301) with respect to the transmitted signal of Terminal 2 (1303) is the uplink signal at TRP2 (1301). The reception power requirement for reception (1316) can be exceeded. Since the strength (1318) of the received power at TRP2 (1301) for the transmitted signal of Terminal 2 (1303) is higher than the received power for the signals of other Terminal 1 (1302) and Terminal 3 (1304), TRP2 (1301) This may cause significant interference when detecting signals from terminal 1 (1302) and terminal 3 (1304).

- If Terminal 2 (1303) adjusts the transmission power to offset the path attenuation amount based on the path attenuation reference signal transmitted by TRP2 (1301) (1325), TRP2 ( The intensity 1328 of the received power at 1301) may satisfy the received power requirement 1326 for uplink signal reception at TRP2 1301. At the same time, when a signal from Terminal 2 (1303) is received at TRP1 (1300), which is located further away from Terminal 2 (1303) than TRP2 (1301) (1320), the transmission power of Terminal 2 (1303) is Terminal 2 (1303). 1303) and TRP1 (1300), it is not enough to offset the amount of path attenuation, so the strength of the received power at TRP1 (1300) with respect to the transmitted signal of Terminal 2 (1303) (1323) is determined by the uplink signal reception at TRP1 (1300). It may not meet the received power requirement (1321). Therefore, the intensity (1323) of the received power at TRP1 (1300) with respect to the transmitted signal of terminal 2 (1303) is determined by the detection performance due to the signal of another terminal with high received power (for example, the received signal of terminal 1 (1302)). It may deteriorate.

In this way, when the terminal receives support for uplink and downlink transmission and reception based on network cooperative communication using a plurality of (for example, synchronized) TRPs from the base station, channel estimation is performed at the base station based on the SRS transmitted from the terminal. If desired, advanced power control methods may be required when transmitting SRS.

Conventionally, for all SRS resources within a specific SRS resource set, transmission power was determined using one p0, one alpha, and one path attenuation reference signal. In the following, an improved power control method during SRS transmission in network cooperative communication is presented. I would like to explain. Therefore, in this disclosure, we would like to propose various methods, such as a power control method based on a plurality of alpha and a plurality of path attenuation reference signals, or a method of selecting different path attenuation reference signals for each different SRS resource transmission unit in the set. .

[Method 3-2-1]

The terminal uses the path attenuation reference signal transmitted from each of the plurality of TRPs to determine the transmission power by considering the multiple alpha values and the multiple path attenuation amounts that can be obtained through the multiple path attenuation reference signals when transmitting a specific SRS. You can. For example, the UE may consider a total of N path attenuation reference signals transmitted from N TRPs, and determine the transmission power by considering single or N alpha values and single or N path attenuation amounts when transmitting a specific SRS. In Equation 4 above, which determines the SRS transmission power, alpha and path attenuation are expressed as α _SRS,b,f,c (q _s ) and PL _b,f,c (q _d ), respectively, and the terminal uses the two parameters The product α _SRS,b,f,c (q _s )·PL _b,f,c (q _d ) value was reflected in Equation 4 above.

If the terminal transmits a specific SRS, a single or N alpha values (e.g., 1st alpha α _SRS,1,b,f,c (q _s ) to N alpha α _SRS,N,b,f,c (q _s )) and a single or N path attenuation amount (e.g., considering the first path attenuation amount PL _1,b,f,c (q _d ) to the Nth path attenuation amount PL _N,b,f,c (q _d )) When determining the transmission power, the terminal can define func(.), an arbitrary function with up to 2N parameters, and this function can have up to N alpha values and up to N path attenuation amounts as input values. There is, and the output value can be reflected when determining SRS transmission power.

In the conventional Equation 4, the above-mentioned arbitrary function func(.) has one alpha value and one path attenuation as input values, and the output value is expressed as the product of the two input values, which is expressed in the following equation It can be expressed as Equation 8.

[Equation 8]

On the other hand, if the terminal determines the SRS transmission power by considering a plurality of alphas and a plurality of path attenuation amounts, the input value for the arbitrary function func(.) is, for example, similar to Equation 8 described above, You can consider the product of alpha with an index and the path attenuation amount. (For example, α _SRS,1,b,f,c (q _s )·PL _1,b,f,c (q _d ), which is the product of the first alpha and the first path attenuation amount, to the N alpha to the N path attenuation amount The product α _SRS,N,b,f,c (q _s )·PL _N,b,f,c (q _d ) can be considered as an input value to the arbitrary function func(.).)

If the output value of an arbitrary function considers the arithmetic mean of the input values, this can be expressed as Equation 9 below.

[Equation 9]

If the output value of an arbitrary function considers a linear combination of input values, this can be expressed as Equation 10 below, where w _i (i=1, ..., N) is a real number between 0 and 1. It can be,

can be satisfied.

[Equation 10]

If the output value of an arbitrary function considers the geometric mean of the input values, this can be expressed as Equation 11 below.

[Equation 11]

When the terminal considers an arbitrary function that uses multiple alphas and multiple path attenuation amounts as input values when transmitting an SRS, various types of output values as above can be considered. In addition to the examples above, all input values for the arbitrary function It is also possible to consider the maximum or minimum value as the output value, and some of the alpha and path attenuation amounts among a plurality of alphas and a plurality of path attenuation amounts can be used as input values of the function, or the α _{SRS,1,b,f ,c} (q _s ) to α _SRS,N,b,f,c (q _s ) values can all be the same (i.e., when considering one alpha and multiple path attenuation amounts as input values), The invention may not be limited to the examples described above.

When the terminal determines the SRS transmission power, the output value of the above-described arbitrary function is α _SRS,N,b,f,c (q _s )·PL _N,b,f,c (q _d ) in Equation 4 above. Can be used instead of a value.

The terminal is configured with upper layer signaling from the base station, activated through MAC-CE, instructed through L1 signaling, notified through a combination of higher layer signaling and L1 signaling, or according to a method fixedly defined in the standard, for example Using Equation 9 as the output value of an arbitrary function, the corresponding output value is α _SRS,N,b,f,c (q _s )·PL _N,b,f,c (q _d ) value in Equation 4 described above. Instead, it can be used to determine the SRS transmit power. In this case, the UE may assume that when transmitting an SRS at a specific OFDM symbol position or a specific SRS transmission unit, each parameter used as an input value for an arbitrary function transmits the SRS toward all TRPs related to it. In other words, if the terminal uses two path attenuation amounts as input values to an arbitrary function, the terminal sends the corresponding SRS to all two TRPs that transmitted the two path attenuation reference signals used to measure the two path attenuation amounts. It can be assumed that .

When the terminal performs SRS transmission through the above-described method, resource efficiency on the base station and the terminal can be increased in that there is no need to separately allocate time or frequency resources for SRS transmission for each TRP. However, when the terminal uses, for example, one of Equations 9 to 11 above to offset the path attenuation, a case may occur where SRS transmission is performed that does not offset any path attenuation for a plurality of TRPs. .

Therefore, in addition to the above-described method, the terminal can consider additional transmission power offset and reflect it in the SRS transmission power. If the received power requirement for the uplink signal in a specific TRP is not fixed to a certain value and is required to operate within a certain range (for example, if the received power requirement is (assuming that an uplink signal received with a received power value within the +a [dBm] value can be decoded at the base station receiver), the SRS received power transmitted by the terminal within the range of the received power requirement considering this additional transmitted power offset It can be adjusted to include this. Additional transmission power offset may be reflected by changing the value of a specific parameter in Equation 4 without changing Equation 4, or new parameters not in Equation 4 may be additionally considered. For example, Equation 9 is used as the output value of an arbitrary function so that the corresponding output value is α _SRS,N,b,f,c (q _s )·PL _N,b,f,c (q _d ) is used instead of the value, and when the additional transmission power offset is additionally considered as a new parameter that is not in Equation 4, the method of determining the SRS transmission power in the terminal can be expressed as Equation 12 below.

[Equation 12]

In Equation 12 above, the additional transmission power offset Offset _c (q _s ,q _d ) can be modified as follows.

- For example, as shown in Equation 12, the additional transmission power offset is expressed as Offset _c (q _s , q _d ), which is a specific SRS resource set q _s and path attenuation within a specific bandwidth portion b, carrier f, and cell c. It may be a value related to the reference signal q _d .

- As another example, the additional transmission power offset may be a value related to a combination of at least one parameter of a specific SRS resource set and a path attenuation reference signal within the specific bandwidth portion b, carrier f, and cell c described above, For example, the additional transmission power offset may be related to a specific cell c by considering the characteristics of the center frequency at which the uplink signal is transmitted in a specific cell c. In this case, all bandwidth portions, all carriers, It can be commonly applied to all SRS resource sets and all path attenuation reference signals, and the additional transmission power offset in that case can be expressed as Offset _c , replacing Offset _c (q _s , q _d ) in Equation 12 above. .

- As another example, depending on the implementation method of the TRP that receives the uplink signal, different reception power requirement ranges may be determined for each TRP, so the additional transmission power offset may be a value related to a specific TRP. Additionally, the additional transmission power offset may be a value related to a specific path attenuation reference signal q _d transmitted by a specific TRP within a specific cell c. If multiple alpha and multiple path attenuation reference signals are considered as shown in Equation 12 below, the terminal may consider a plurality of additional transmission power offsets corresponding to the multiple path attenuation reference signals. For the plurality of additional transmission power offsets, similar to Equations 9 to [Equation 15] or other modifications, a specific arbitrary function that takes a plurality of additional transmission power offsets as input values is used, and the output value is SRS transmission. It can be used when determining power. For example, the additional transmission power offset within a specific cell corresponding to the ith path attenuation reference signal q _d,i can be defined as Offset _c (q _d,i ), using the arithmetic mean value of N additional transmission power offsets. In this case, the terminal can replace Offset _c (q _s , q _d ) in Equation 12 above using Equation 13 below.

The terminal is configured with higher layer signaling from the base station for the additional transmission power offset value, activated through MAC-CE, instructed through L1 signaling, notified through a combination of higher layer signaling and L1 signaling, or fixed to the standard. You can use the value defined as . When set to upper layer signaling, the terminal can receive a list of a plurality of additional transmission power offsets from the base station, of which the specific additional transmission power offset value is a specific bandwidth portion, a specific carrier, a specific cell, and a specific SRS resource set. , may be related to a combination of at least one or more parameters such as a specific path attenuation reference signal. That is, the additional transmission power offset value may be bandwidth-specific, carrier- or cell-specific, or may be set for a specific SRS resource set or a specific path attenuation reference signal.

[Equation 13]

FIG. 14 is a diagram showing SRS reception power for each TRP when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

In a 5G network in which base stations consisting of TRP1 (1400) and TRP2 (1401) support cooperative communication, terminal 2 (1402) receives 5G service support from the base station. Terminal 2 (1402) exists between TRP1 (1400) and TRP2 (1401), and the distance to TRP2 (1401) is closer than the distance to TRP1 (1400).

Terminal 2 (1402) is located relatively close to TRP2 (1401), but is located between TRP1 (1400) and TRP2 (1401), so the base station uses some or all of TRP1 (1400) and TRP2 (1401) depending on the situation. Uplink and downlink transmission and reception with Terminal 2 (1402) can be supported. Therefore, when the terminal performs uplink transmission, depending on which path attenuation amount is offset based on which of the path attenuation reference signals transmitted by TRP1 (1400) or TRP2 (1401), TRP1 (1400) and TRP2 (1401) The intensity of received power may vary.

- If Terminal 2 (1402) adjusts the transmission power to offset the path attenuation amount based on the path attenuation reference signal transmitted by TRP1 (1400) (1410), TRP1 ( The intensity of received power (1413) at 1400) may satisfy the received power requirement (1411) for uplink signal reception at TRP1 (1400). At the same time, when a signal from Terminal 2 (1402) is received at TRP2 (1401), which is located closer to Terminal 2 (1402) than TRP1 (1400) (1420), the transmission power of Terminal 2 (1402) is Terminal 2 (1402). Since the amount of path attenuation between 1402) and TRP2 (1401) can be offset, the strength (1423) of the received power at TRP2 (1401) with respect to the transmitted signal of Terminal 2 (1402) is the uplink signal at TRP2 (1401). The reception power requirement for reception (1421) can be exceeded. The strength 1423 of the received power at TRP2 1401 relative to the transmitted signal of terminal 2 1402 may act as a significant interference when detecting signals from other terminals when other terminals are present.

- If Terminal 2 (1402) adjusts the transmission power to offset the path attenuation amount based on the path attenuation reference signal transmitted by TRP2 (1401) (1440), TRP2 ( The intensity 1443 of the received power at 1401) may satisfy the received power requirement 1441 for uplink signal reception at TRP2 1401. At the same time, when a signal from Terminal 2 (1402) is received at TRP1 (1400), which is located further away from Terminal 2 (1402) than TRP2 (1401) (1430), the transmission power of Terminal 2 (1402) is Terminal 2 (1402). 1402) and TRP1 (1400), it is not enough to offset the amount of path attenuation, so the strength (1433) of the received power at TRP1 (1400) with respect to the transmitted signal of Terminal 2 (1402) is determined by the uplink signal reception at TRP1 (1400). It may not meet the received power requirement (1431). The intensity of the received power (1433) at TRP1 (1400) with respect to the transmitted signal of terminal 2 (1402) may have deteriorated detection performance due to signals from other terminals with high received power.

- If Terminal 2 (1402), for example, uses Equation 9 described above using different path attenuation reference signals and two different alpha values transmitted by TRP1 (1400) and TRP2 (1401), respectively, Consider the case where the SRS transmission power is determined by using the output value instead of the α _SRS,N,b,f,c (q _s )·PL _N,b,f,c (q _d ) value in Equation 4 above. According to Equation 9, the method is similar to using the average of the two path attenuation amounts, so the average value of the path attenuation amount between Terminal 2 (1402) and TRP1 (1400) and the path attenuation amount between Terminal 2 (1402) and TRP2 (1401) may have offsetting results. As a result, in the case of 1410, only the path attenuation between Terminal 2 (1402) and TRP1 (1400) can be offset, resulting in a lower received power value compared to the received power value (1413) obtained from TRP1 (1400). Therefore, Terminal 2 (1402) ) may have a received power value lower than the received power requirements (1411, 1431) for uplink signal reception in TRP1 (1400) (1414). Similarly, in the case of 1440, Terminal 2 (1402) only offsets the path attenuation between Terminal 2 (1402) and TRP1 (1400), resulting in a higher received power value (1414) compared to the received power requirement (1421) obtained from TRP2 (1401). It may have a lower received power value compared to (1424). In this case, the terminal used a method of offsetting the path attenuation by considering the path attenuation reference signal and alpha value for both TRPs, but compared to satisfying the received power requirement (1411) of TRP1 (1400) using the existing method, , it cannot be satisfied with this method.

- If the reception power requirement for the uplink signal in TRP1 (1400) and TRP2 (1401) is not fixed to a certain value and is required within a certain range to enable operation (1412, 1422, 1432, 1442), the terminal is operated as described above. As described above, information about additional transmission power offset can be notified from the base station in various ways. If the UE does not consider the additional transmission power offset, the SRS reception power (1424, 1444) at TRP2 (1401) for the SRS transmission of UE 2 (1402) is within the reception power requirement range (1412, 1422, 1432, 1442) ), the SRS received power (1414, 1434) in TRP1 (1400) may not be included within the received power demand range (1412, 1422, 1432, 1442).

- If the UE considers the additional transmission power offset and reflects it when determining the SRS transmission power, the final SRS reception power at TRP1 (1400) for the SRS transmission of UE 2 (1402) will not take the additional transmission power offset into consideration. It may be higher by a certain value (1415, 1435) compared to the SRS reception power (1414, 1434). In this case, it may be included within the reception power demand range (1412, 1422, 1432, 1442), and the SRS transmission of terminal 2 (1402) The final SRS reception power in TRP2 (1401) may also be higher by a certain value (1425, 1445) compared to the SRS reception power (1424, 1444) when additional transmission power offset is not considered, and the reception power required range (1412) , 1422, 1432, 1442).

In this way, if the UE uses the SRS transmission power determination method that considers a plurality of path attenuation reference signals, the UE uses the additional transmission power offset information notified by the base station to determine the SRS to be within the required reception power range of each TRP. Transmission power can be adjusted.

The terminal may not expect the value of the above-described plurality of alphas and the maximum number N of path attenuation amounts to be greater than 4, but may expect it to be less than or equal to 4. Alternatively, the terminal may not expect the value of the maximum number N of the above-described plurality of path attenuation amounts to be greater than 4, but may expect it to be less than or equal to 4. Alternatively, the terminal may not expect the value of the maximum number N of the above-described plurality of alphas to be greater than 16, 32, or 64, and may expect it to be less than or equal to 16, 32, or 64.

[Method 3-2-2]

The terminal may determine the transmission power by dynamically selecting a specific reference signal among the path attenuation reference signals transmitted in each of the plurality of TRPs. The terminal can receive a plurality of power control parameter sets within a specific SRS resource set from the base station, and when the terminal receives a transmission instruction from the base station for the corresponding SRS resource set, for each SRS transmission unit when transmitting an SRS within the corresponding SRS resource set. Different power control parameter sets can be applied. At this time, the power control parameter set may consist of at least p0, alpha, a path attenuation reference signal, a closed loop index, etc., and the maximum number of power control parameter sets that can be set may not be more than 64, for example. For example, if the terminal receives two SRS resources within a specific SRS resource set and two power control parameter sets within the SRS resource set, the terminal applies the first power control parameter set when transmitting the first SRS resource. Thus, the SRS transmission power can be determined, and the SRS transmission power can be determined by applying the second power control parameter set when transmitting the second SRS resource. When using this method, the terminal can offset the path attenuation corresponding to each TRP for each SRS transmission unit, so when estimating the uplink channel at the base station, high channel estimation performance can be obtained with lower delay time than before. .

The terminal can receive a plurality of power control parameter sets within the SRS resource set from the base station, and receive a specific power control parameter set to be used for each SRS transmission unit from the base station through higher layer signaling.

- For example, if the SRS transmission unit is each SRS resource, the terminal receives the index of a specific power control parameter set as an additional parameter within the upper layer signaling for each SRS resource, or p0, alpha, path attenuation reference signal, and closure. The combined information of at least one type of loop index can be set. If a specific power control parameter is commonly used for all SRS resources within a specific SRS resource set (e.g., a combination of at least one of p0, alpha, path attenuation reference signal, and closed-loop index), the parameter is the parent for each SRS resource. It may be included in upper layer signaling for each SRS resource set rather than layer signaling.

- As another example, the terminal may receive a specific sequence consisting of indexes for some or all of a plurality of power control parameter sets from the base station within the SRS resource set or upper layer signaling for each SRS resource, and the terminal may transmit SRS through this. You can know the index of the power control parameter set to be applied for each unit. At this time, the specific sequence may be a fixed sequence or may be determined by a pseudo-random sequence generation formula. For example, if there are four power control parameter sets, and a specific sequence consisting of indices (set 1 to 4) for all of them is set to {1, 4, 2, 3}, the terminal transmits each SRS transmission unit. The SRS transmission power can be determined by applying a specific power control parameter set according to the corresponding sequence. If the terminal receives two SRS resources within the corresponding SRS resource set from the base station, each SRS resource is transmitted in two OFDM symbols, and receives one OFDM symbol as an SRS transmission unit, the terminal receives the first SRS resource of the first SRS resource. The first power control parameter set is applied in the first SRS transmission unit, and the terminal applies the fourth power control parameter set in the second SRS transmission unit of the first SRS resource, and the terminal applies the fourth power control parameter set in the first SRS transmission unit of the second SRS resource. The second power control parameter set is applied, and the terminal can apply the third power control parameter set in the second SRS transmission unit of the second SRS resource. The UE can determine the SRS transmission power for each SRS transmission unit based on the sequence for the power control parameter set, and if the power control parameter set corresponding to the index of the last power control parameter set in the sequence is applied to determine the SRS transmission power If so, the power control parameter set of the first index in the sequence can be reapplied to the next SRS transmission unit.

The terminal can activate or update some or all of a plurality of power control parameter sets set by upper layer signaling in the SRS resource set from the base station through MAC-CE. As an example, consider the case where the terminal receives the first to fourth power control parameter sets through higher layer signaling within a specific SRS resource set among a total of 64 power control parameter sets set by the base station. If a change is required to the power control parameter set of the corresponding SRS resource set based on the terminal's CSI report information or the uplink signal and channel estimation performance at the base station, the terminal controls power from the base station instead of resetting the upper layer signaling. By receiving MAC-CE updating parameters, the first to fourth power control parameter sets can be updated to the fifth to eighth power control parameter sets. At this time, the MAC CE may include the identifier of the SRS resource set and the identifier of the power control parameter set by higher layer signaling.

FIG. 15 is another diagram showing SRS reception power for each TRP when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

In a 5G network where base stations consisting of TRP1 (1500) and TRP2 (1501) support cooperative communication, terminal 2 (1502) receives 5G service support from the base station. Terminal 2 (1502) exists between TRP1 (1500) and TRP2 (1501), and the distance to TRP2 (1501) is closer than the distance to TRP1 (1500).

Terminal 2 (1502) is located relatively close to TRP2 (1501), but is located between TRP1 (1500) and TRP2 (1501), so the base station uses some or all of TRP1 (1500) and TRP2 (1501) depending on the situation. Uplink and downlink transmission and reception with Terminal 2 (1502) can be supported. Therefore, when the terminal performs uplink transmission, the path attenuation amount is offset based on which of the path attenuation reference signals transmitted by TRP1 (1500) or TRP2 (1501) is used in TRP1 (1500) and TRP2 (1501). The intensity of received power may vary.

Terminal 2 (1502) is configured with 4 SRS resources in a specific SRS resource set, and if the SRS transmission unit for the SRS resource set is each SRS resource, the terminal can transmit SRS in a total of 4 SRS transmission units. At this time, Terminal 2 (1502) can receive two power control parameter sets from the base station through upper layer signaling within the corresponding SRS resource set, and a specific sequence consisting of indices for some or all of the power control parameter sets described above. It can be set within the SRS resource set, and for example, it can be assumed that the sequence is set to {1, 2}. In this case, the first power control parameter set is applied when transmitting SRS transmission units #1 (1510) and #3 (1512), and the second power control parameter set is applied when transmitting SRS transmission units #2 (1511) and #4 (1513). set can be applied. At this time, the first and second power control parameter sets may be composed of a combination of at least one of p0, alpha, closed loop index, and path attenuation reference signal related to TRP1 (1500) and TRP2 (1501), respectively.

If the terminal transmits SRS by applying the first power control parameter set in SRS transmission units #1 (1510) and #3 (1512), the received power that satisfies the received power requirement (1520) is transmitted in TRP1 (1500). However, in TRP2 (1501), received power exceeding the received power requirement (1530) can be obtained (1531, 1533). If the terminal transmits SRS by applying the second power control parameter set in SRS transmission units #2 (1511) and #4 (1513), the received power requirement (1520) is not satisfied in TRP1 (1500). Low received power can be obtained (1522, 1524), but in TRP2 (1501), received power that satisfies the received power requirement (1530) can be obtained (1532, 1534). With the existing SRS power control method, a single power control parameter set can be applied to SRS transmission within a specific SRS resource set, so SRS transmission units #1 to #4 had no choice but to transmit at the same power. However, through this method, By making it possible to quickly change and adjust power control parameters for each SRS transmission unit, power control for SRS can be performed more flexibly, and the base station can estimate the uplink channel more quickly and use it for uplink and downlink scheduling of the terminal. there is.

[Method 3-2-3]

The terminal receives upper layer signaling from the base station for a combination of at least one of the above [Method 3-2-1] to [Method 3-2-2], is activated through MAC-CE, or is instructed through L1 signaling. It can be received, notified by a combination of upper layer signaling and L1 signaling, or fixedly defined in the standard.

- For example, when the terminal transmits a plurality of SRS resources within a specific periodic, semi-permanent, or aperiodic SRS resource set, transmission for some SRS resources is based on [Method 3-2-1] and some remaining SRS resources Transmission for can be based on [Method 3-2-2].

- As another example, when the terminal receives activation or trigger for a specific SRS resource set among a plurality of periodic, semi-permanent or aperiodic SRS resource sets from the base station, all information in the corresponding SRS resource set is activated according to information additionally notified from the base station. When transmitting an SRS resource, you can select one of [Method 3-2-1] and [Method 3-2-2] for determining SRS transmission power. For information additionally notified from the base station, the terminal receives upper layer signaling for each SRS resource set from the base station, is activated through MAC-CE, is instructed through L1 signaling, or uses a combination of higher layer signaling and L1 signaling. You can use values that are notified through or fixedly defined in the standard.

- As another example, the terminal uses [Method 3-2-1] and [Method 3-2-2] for SRSs with operations in different time dimensions (e.g., one of periodic, semi-permanent, and aperiodic SRS). ] You can select one of the following and use it as a method for determining SRS transmission power. For example, [Method 3-2-1] can be used when transmitting periodic and semi-permanent SRS, and [Method 3-2-2] can be used when transmitting aperiodic SRS, but is not limited to this and various modifications can be made. It may be possible.

In the above-described [Method 3-2-1] to [Method 3-2-3], specific SRS transmission may refer to transmission for all SRS resources within a specific SRS resource set, or may refer to transmission for a specific SRS resource within a specific SRS resource set. It may also refer to transmission for the unit, and may be one of the SRS transmission units described above.

The terminal may report its capabilities to the base station as to whether it supports a combination of at least one of the above [Method 3-2-1] to [Method 3-2-3]. The terminal capability may include at least one component indicating support for a combination of at least one of the above [Method 3-2-1] to [Method 3-2-3] within a single terminal capability, It may be defined as multiple different terminal capabilities. If the terminal capability for the specific method described above is not reported, the meaning may be interpreted as support for other methods.

For the above-described [Method 3-2-1] to [Method 3-2-3], at least one SRS transmission unit is transmitted between two adjacent SRS transmission units in time when SRS transmission to which the terminal applies different power control parameter sets is performed. The OFDM symbol can be introduced as a kind of guard symbol. This takes into account various time delay factors that may be required when adjusting power according to the difference in transmission power between two SRS transmission units. The number of guard symbols may have different values depending on the cell to which the base station and the terminal belong and the subcarrier spacing (numerology) of the bandwidth portion. The presence or absence of the corresponding guard symbol and its value are reported from the terminal to the base station as a terminal capability and the value is used as is, or is set as upper layer signaling in the base station based on the terminal capability reported from the terminal, or activated through MAC-CE. Alternatively, it may be indicated through L1 signaling, or may be fixedly defined in the standard. When the terminal reports the information as a terminal capability, different values may be reported for each subcarrier interval. Additionally, when the terminal reports the information as a terminal capability, it can be reported in expressions such as symbols, slots, or absolute time. Additionally, the value of the corresponding guard symbol may be the same as the number of guard symbols used in SRS transmission for antenna switching. All matters mentioned in the above embodiment can be applied regardless of whether the corresponding guard symbol exists between a plurality of connected SRS transmission units.

The contents of all of the above-described embodiments are applicable to some or all of periodic, semi-permanent, and aperiodic SRS, and some of the cases where the usage of upper layer signaling in the SRS resource set is codebook, non-codebook, antenna switching, and beam management. Or it may be applicable to all.

FIG. 16 is a diagram illustrating the operation of a terminal when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

The terminal can report its capabilities to the base station (1600). The corresponding terminal capability report may be a combination of at least one of the terminal capabilities mentioned in the above-described embodiment. For example, the terminal capabilities reported by the terminal include support for [Method 1-1] to [Method 1-4], support for [Method 1-3-1] to [Method 1-3-3], [ Whether to support time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1], [time resource operation 3-2], [method 3-2-1] to [method 3-2-3], a combination of at least one or more of UE capabilities related to guard symbols between two adjacent SRS transmission units may be included. Afterwards, the terminal can receive higher layer signaling configuration information from the base station (1605). The corresponding higher layer signaling may be a combination of at least one of the higher layer signaling configuration information mentioned in the above-described embodiment. For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time resource operation 3-1], [Time resource operation 3-2], [Method 3-2-1] to [Method 3-2-3], among guard symbols between two adjacent SRS transmission units It may be upper layer signaling related to at least one or more things. The terminal may additionally receive MAC-CE and/or L1 signaling from the base station (1610). For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time resource operation 3-1], [Time resource operation 3-2], [Method 3-2-1] to [Method 3-2-3], among guard symbols between two adjacent SRS transmission units It may be MAC-CE and/or L1 signaling related to at least one or more. Thereafter, the UE may perform SRS transmission by determining the SRS transmission power for each SRS transmission unit based on instructions from the base station received through the above-described higher layer signaling and MAC-CE and/or L1 signaling (1615 ).

Each step described in FIG. 16 may be performed by changing its order, adding other steps, or omitting the described steps.

FIG. 17 is a diagram illustrating the operation of a base station when determining SRS transmission power considering a plurality of power control parameters in network cooperative communication according to an embodiment of the present disclosure.

The base station may receive terminal capabilities from the terminal (1700). The corresponding terminal capability report may be a combination of at least one of the terminal capabilities mentioned in the above-described embodiment. For example, the terminal capabilities reported by the terminal include support for [Method 1-1] to [Method 1-4], support for [Method 1-3-1] to [Method 1-3-3], [ Whether to support time resource operation 2-1], [time resource operation 2-2], [time resource operation 3-1], [time resource operation 3-2], [method 3-2-1] to [method 3-2-3], a combination of at least one or more of UE capabilities related to guard symbols between two adjacent SRS transmission units may be included. Afterwards, the base station may transmit higher layer signaling configuration information to the terminal (1705). The corresponding higher layer signaling may be a combination of at least one of the higher layer signaling configuration information mentioned in the above-described embodiment. For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time resource operation 3-1], [Time resource operation 3-2], [Method 3-2-1] to [Method 3-2-3], among guard symbols between two adjacent SRS transmission units It may be upper layer signaling related to at least one or more things. The base station may additionally transmit MAC-CE and/or L1 signaling to the terminal (1710). For example, the above-described [Method 1-1] to [Method 1-4], [Method 1-3-1] to [Method 1-3-3], [Time Resource Operation 2-1], and [Time Resource Operation 2] -2], [Time resource operation 3-1], [Time resource operation 3-2], [Method 3-2-1] to [Method 3-2-3], among guard symbols between two adjacent SRS transmission units It may be MAC-CE and/or L1 signaling related to at least one or more. Thereafter, the base station can receive the terminal's SRS transmission in some or all TRPs configured by the base station for each SRS transmission unit, based on the upper layer signaling and MAC-CE and/or L1 signaling transmitted to the terminal described above. (1715).

Each step described in FIG. 17 may be performed by changing its order, adding other steps, or omitting the described steps.

FIG. 18 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 18, the terminal may include a transceiver (referring to the terminal receiver 1800 and the terminal transmitter 1810), a memory (not shown), and a terminal processing unit 1805 (or a terminal control unit or processor). Depending on the communication method of the terminal described above, the terminal's transceiver units (1800, 1810), memory, and terminal processing unit (1805) can operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the aforementioned components. In addition, the transceiver, memory, and processor may be implemented in the form of a single chip.

The transceiver unit can transmit and receive signals to and from the base station. Here, the signal may include control information and data. To this end, the transceiver may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. However, this is only an example of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

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

Memory can store programs and data necessary for the operation of the terminal. Additionally, the memory can store control information or data included in signals transmitted and received by the terminal. Memory may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Additionally, there may be multiple memories.

Additionally, the processor can control a series of processes so that the terminal can operate according to the above-described embodiment. For example, the processor may receive configuration information related to SRS transmission power, determine SRS transmission power for each SRS transmission unit, and control components of the terminal to transmit SRS. There may be a plurality of processors, and the processor may perform a component control operation of the terminal by executing a program stored in the memory.

FIG. 19 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 19, the base station may include a base station receiver 1900, a transceiver unit referring to the base station transmitter 1910, a memory (not shown), and a base station processing unit 1905 (or a base station control unit or processor). According to the above-described communication method of the base station, the base station's transceiver units 1900 and 1910, memory, and base station processing unit 1905 can operate. However, the components of the base station are not limited to the above examples. For example, a base station may include more or fewer components than those described above. In addition, the transceiver, memory, and processor may be implemented in the form of a single chip.

The transmitting and receiving unit can transmit and receive signals to and from the terminal. Here, the signal may include control information and data. To this end, the transceiver may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. However, this is only an example of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

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

The memory can store programs and data necessary for the operation of the base station. Additionally, the memory may store control information or data included in signals transmitted and received by the base station. Memory may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Additionally, there may be multiple memories.

The processor can 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 transmit configuration information related to SRS transmission power and control each component of the base station to receive SRS for each SRS transmission unit. There may be a plurality of processors, and the processor may perform a component control operation of the base station by executing a program stored in a memory.

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

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

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM: Compact Disc-ROM), Digital Versatile Discs (DVDs), or other types of It can be stored in an optical storage device or magnetic cassette. Alternatively, it may be stored in a memory consisting of a combination of some or all of these. Additionally, multiple configuration memories may be included.

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

In the specific embodiments of the present disclosure described above, components included in the invention are expressed in singular or plural numbers depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural may be composed of singular or singular. Even expressed components may be composed of plural elements.

Meanwhile, the embodiments of the present disclosure disclosed in the specification and drawings are merely provided as specific examples to easily explain the technical content of the present disclosure and aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it is obvious to those skilled in the art that other modifications based on the technical idea of the present disclosure can be implemented. Additionally, each of the above embodiments can be operated in combination with each other as needed. For example, a base station and a terminal may be operated by combining one embodiment of the present disclosure with parts of another embodiment. For example, parts of the first and second embodiments of the present disclosure may be combined to operate the base station and the terminal. In addition, although the above embodiments were presented based on the FDD LTE system, other modifications based on the technical idea of the above embodiments may be implemented in other systems such as a TDD LTE system, 5G or NR system.

Meanwhile, in the drawings explaining the method of the present invention, the order of explanation does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

Alternatively, the drawings explaining the method of the present invention may omit some components and include only some components within the scope that does not impair the essence of the present invention.

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

Various embodiments of the present disclosure have been described above. The above description of the present disclosure is for illustrative purposes, and the embodiments of the present disclosure are not limited to the disclosed embodiments. A person skilled in the art to which this disclosure pertains will understand that the present disclosure can be easily modified into another specific form without changing its technical idea or essential features. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present disclosure. do.

Claims (15)

1. In a method performed by a terminal of a wireless communication system,

   Receiving sounding reference signal (SRS) configuration information supporting eight antenna ports from a base station;

   determining SRS transmission power based on the configuration information; and

   Transmitting SRS using the eight antenna ports based on the SRS transmission power,

   The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by the number of antenna ports set for each symbol when the SRS of the eight antenna ports is transmitted in two consecutive symbols. How to do it.
2. According to paragraph 1,

   The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by 8 when the SRS of the eight antenna ports is transmitted in one symbol.
3. The method of claim 1, wherein a first antenna port set including four antenna ports is set in the first symbol of the two consecutive symbols, and a second antenna port set including four antenna ports is set in the second symbol. A method characterized in that it is set.
4. The method of claim 3, wherein when the configuration information indicates that the SRS is transmitted in symbols that are multiples of 2, the first antenna port set is set in odd-numbered symbols and the second antenna port set is set in even-numbered symbols. A method characterized by:
5. In a method performed by a base station of a wireless communication system,

   Transmitting sounding reference signal (SRS) configuration information supporting 8 antenna ports to the terminal; and

   Comprising receiving SRS using the eight antenna ports from the terminal,

   The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by the number of antenna ports set for each symbol when the SRS of the eight antenna ports is transmitted in two consecutive symbols. How to.
6. According to clause 5,

   The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by 8 when the SRS of the eight antenna ports is transmitted in one symbol.
7. The method of claim 5, wherein a first antenna port set including four antenna ports is set in the first symbol of the two consecutive symbols, and a second antenna port set including four antenna ports is set in the second symbol. A method characterized in that it is set.
8. The method of claim 7, wherein when the configuration information indicates that the SRS is transmitted in symbols that are multiples of 2, the first antenna port set is set in odd-numbered symbols and the second antenna port set is set in even-numbered symbols. A method characterized by:
9. In the terminal of a wireless communication system,

   Transmitter and receiver; and

   Receives sounding reference signal (SRS) configuration information supporting 8 antenna ports from the base station,

   Determine SRS transmission power based on the setting information, and

   It includes a control unit that controls SRS transmission using the eight antenna ports based on the SRS transmission power,

   The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by the number of antenna ports set for each symbol when the SRS of the eight antenna ports is transmitted in two consecutive symbols. A terminal with .
10. According to clause 9,

    The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by 8 when the SRS of the eight antenna ports is transmitted in one symbol.
11. The method of claim 9, wherein a first antenna port set including four antenna ports is set in the first symbol of the two consecutive symbols, and a second antenna port set including four antenna ports is set in the second symbol. A terminal characterized by being set.
12. The method of claim 11, wherein when the configuration information indicates that the SRS is transmitted in symbols that are multiples of 2, the first antenna port set is set in odd-numbered symbols and the second antenna port set is set in even-numbered symbols. A terminal characterized by:
13. In the base station of a wireless communication system,

    Transmitter and receiver; and

    Transmits sounding reference signal (SRS) setting information supporting 8 antenna ports to the terminal,

    It includes a control unit that controls receiving SRS using the eight antenna ports from the terminal,

    The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by the number of antenna ports set for each symbol when the SRS of the eight antenna ports is transmitted in two consecutive symbols. A base station that does.
14. According to clause 13,

    The SRS transmission power is determined by dividing the calculated transmission power converted to a linear scale by 8 when the SRS of the eight antenna ports is transmitted in one symbol.
15. The method of claim 13, wherein a first antenna port set including four antenna ports is set in the first symbol of the two consecutive symbols, and a second antenna port set including four antenna ports is set in the second symbol. is set, and when the setting information indicates that the SRS is transmitted in a multiple of 2 symbols, the first antenna port set is set in the odd-numbered symbol and the second antenna port set is set in the even-numbered symbol. A base station that does.

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