Method and apparatus for uplink transmission under carrier aggregation in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to operations of a terminal and a base station in a wireless communication system. More specifically, the present disclosure relates to a method for transmitting and receiving a signal by using three transmission antennas in a wireless communication system, and an apparatus capable of performing same. According to the present disclosure, a signal can be effectively transmitted and received by using three transmission antennas in a wireless communication system.

Description

Method and device for uplink transmission during carrier aggregation in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to an uplink transmission method and a device capable of performing the method during carrier aggregation in a wireless communication system.

[0002] 5G communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band, such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave), such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G communication technology in consideration of the services that 5G communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with 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 terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G communication systems includes new waveforms to ensure coverage in the terahertz band of 6G communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to realize services with complexity that exceeds the limits of terminal computing capabilities. It could serve as a basis for the development of next-generation distributed computing technologies.

[0008] The technical problem of the present disclosure is to provide a device and method capable of effectively transmitting and receiving signals using three transmission antennas in a wireless communication system.

[0009] As a first aspect of the present disclosure, a method is provided for a terminal supporting three transmit antennas in a wireless communication system, the method comprising: transmitting terminal capability information including information indicating a maximum number of sounding reference signal (SRS) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; receiving an upper layer configuration including an SRS resource for which the number of ports is set; identifying one of the four ports as unused when the number of ports for the SRS resource is 4; transmitting an SRS for the SRS resource using the port identified based on the number of ports; receiving scheduling information for uplink transmission; and performing the uplink transmission based on the received scheduling information.

[0010] As a second aspect of the present disclosure, a terminal supporting three transmission antennas in a wireless communication system is provided, the terminal including a transceiver; and a processor, wherein the processor is configured to control the transceiver to: transmit terminal capability information including information indicating a maximum number of sounding reference signal (SRS) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; receive an upper layer configuration including an SRS resource for which the number of ports is set, and when the number of ports for the SRS resource is 4, one of the four ports is identified as unused; transmit an SRS for the SRS resource using a port identified based on the number of ports; receive scheduling information for uplink transmission; and perform the uplink transmission based on the received scheduling information.

[0011] As a third aspect of the present disclosure, a method performed by a base station in a wireless communication system is provided, the method comprising: receiving terminal capability information from the terminal, the terminal capability information including information indicating a maximum number of sounding reference signal (SRS) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; transmitting to the terminal an upper layer configuration including an SRS resource for which the number of ports is set; when the number of ports for the SRS resource is 4, one of the four ports is identified as unused; receiving from the terminal an SRS for the SRS resource using a port identified based on the number of ports; transmitting to the terminal scheduling information for uplink transmission; and receiving from the terminal the uplink transmission based on the scheduling information.

[0012] As a fourth aspect of the present disclosure, a base station is provided in a wireless communication system, the base station including a transceiver; and a processor, wherein the processor is configured to control the transceiver to: receive terminal capability information from the terminal, the terminal capability information including information indicating a maximum number of sounding reference signal (SRS) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; transmit to the terminal a higher layer configuration including an SRS resource for which the number of ports is set, and when the number of ports for the SRS resource is 4, one of the four ports is identified as unused; receive from the terminal an SRS for the SRS resource using a port identified based on the number of ports; transmit to the terminal scheduling information for uplink transmission; and receive the uplink transmission from the terminal based on the scheduling information.

[0013] In one embodiment of the present disclosure, the one port may be the last port among the four ports.

[0014] In one embodiment of the present disclosure, the four ports include antenna port 1000, antenna port 1001, antenna port 1002, and antenna port 1003, and one port may be antenna port 1003.

[0015] In one embodiment of the present disclosure, the upper layer setting may further include information indicating that one of the four ports is not in use.

[0016] In one embodiment of the present disclosure, identifying one of the four ports as unused may include identifying one of the four ports as unused based on information indicating that one of the four ports is unused.

[0017] In one embodiment of the present disclosure, the terminal capability information further includes information indicating the maximum number of layers supported by the terminal, and the maximum number of layers may include 3.

[0018] In one embodiment of the present disclosure, the upper layer configuration includes an SRS resource set whose usage is set to a codebook, and the uplink transmission may include a codebook-based uplink transmission.

[0019] According to the present disclosure, a wireless communication system can effectively transmit and receive signals using three transmitting antennas.

[0020] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0021] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0022] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0023] FIG. 4 is a diagram illustrating an example of base station beam allocation according to a transmission configuration indicator (TCI) state setting in a wireless communication system according to an embodiment of the present disclosure.

[0024] FIG. 5 is a diagram of a beam application time that can be considered when using an integrated TCI method in a wireless communication system according to one embodiment of the present disclosure.

[0025] FIG. 6 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or a separate DL or UL TCI state in a wireless communication system according to one embodiment of the present disclosure.

[0026] FIG. 7 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0027] FIG. 8 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0028] FIG. 9 is a diagram illustrating a method for allocating comb offset and cyclic shift during SRS transmission according to one embodiment of the present disclosure.

[0029] FIG. 10 is a diagram illustrating an SRS antenna switching operation according to one embodiment of the present disclosure.

[0030] FIG. 11 is an example of a terminal performing uplink transmission using three power amplifiers and antennas according to one embodiment of the present disclosure.

[0031] Figure 12 shows the terminal capability using the terminal to indicate the total combined power. CMAX This is a diagram showing an example of the process of setting values.

[0032] FIG. 13 is a diagram illustrating an example of a process for setting a PCMAX value by using a terminal capability indicating additional power.

[0033] FIG. 14 is a diagram illustrating power constraints for each power amplifier for each carrier according to the number of antennas for each carrier when combining carriers within a band according to one embodiment of the present disclosure.

[0034] FIG. 15 is a diagram illustrating the operation of a terminal according to one embodiment of the present disclosure.

[0035] FIG. 16 is a diagram illustrating the operation of a base station according to one embodiment of the present disclosure.

[0036] FIG. 17 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0037] FIG. 18 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0039] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0040] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0041] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout the specification.

[0042] Hereinafter, the base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present 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, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, the 5th generation wireless communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems through some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0043] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0044] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0045] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, 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 further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0046] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0047] As a representative example of the above broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0048] As the future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0049] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band.

[0050] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage due to the nature of the service, and thus may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0051] Finally, URLLC refers to a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services such as remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and, at the same time, must have a 10 -5The following packet error rate (PER) requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a smaller Transmit Time Interval (TTI) than other services. Simultaneously, design considerations may require the allocation of extensive resources in the frequency band to ensure communication link reliability.

[0052] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0053] Hereinafter, a / b can be understood as at least one of a or b.

[0054] [NR time-frequency resources]

[0055] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0056] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

[0057] The horizontal axis of 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 can constitute one resource block (RB, 104). One subframe (110) on the time axis can include multiple OFDM symbols (102). For example, the length of one subframe can be 1 ms.

[0058] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0059] Figure 2 illustrates an example of a structure of a frame (Frame, 200), a subframe (Subframe, 201), and a slot (Slot, 202). One frame (200) can be defined as 10 ms. One subframe (201) can be defined as 1 ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( =14). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per 1 subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In an example of FIG. 2, cases where the subcarrier spacing setting value μ = 0 (204) and μ = 1 (205) are illustrated. When μ = 0 (204), 1 subframe (201) may be composed of one slot (202), and when μ = 1 (205), 1 subframe (201) may be composed of two slots (203). That is, the number of slots per 1 subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Depending on the subcarrier spacing setting μ and can be defined as [Table 1] below.

[0060] [Table 1]

[0061]

[0062] [Bandwidth Part (BWP)]

[0063] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0064] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0065] FIG. 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information in [Table 2] below for each bandwidth portion.

[0066] [Table 2]

[0067]

[0068] Of course, the above example is not limited, and in addition to the above configuration information, various parameters related to the bandwidth portion can be configured for the terminal. The above information can be transmitted from the base station to the terminal via upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth portion among the configured one or more bandwidth portions can be activated. Whether or not the configured bandwidth portion is activated can be semi-statically transmitted from the base station to the terminal via RRC signaling or dynamically transmitted via DCI.

[0069] According to some embodiments, a terminal before RRC connection can be configured with an initial bandwidth portion (Initial BWP) for initial access from a base station through a Master Information Block (MIB). More specifically, the terminal can receive configuration information about a control resource set (CORESET) and a search space in which a PDCCH for receiving system information required for initial access (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)) and search space can be transmitted through the MIB during the initial access phase. The control space and search space configured by the MIB can each be regarded as identifier (ID) 0. The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control space #0 through the MIB. Additionally, the base station can notify the terminal of the monitoring cycle and monitoring occasion settings for control area #0, i.e., search space #0, via the MIB. The terminal can consider the frequency range 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 considered as 0.

[0070] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0071] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0072] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0073] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth, for example, 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, for example, 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0074] In the method for setting the bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the initial bandwidth portion (Initial BWP) through the MIB during the initial access phase. More specifically, the terminal can receive a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the PBCH (Physical Broadcast Channel). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive the PDSCH (Physical Downlink Shared Channel) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (Other System Information (OSI), paging, and random access).

[0075] [Bandwidth Part (BWP) Change]

[0076] When one or more bandwidth parts are set for a terminal, the base station can instruct the terminal to change (or switch, transition) the bandwidth part using the bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently activated bandwidth part of the terminal is bandwidth part #1 (301), the base station can instruct the terminal to bandwidth part #2 (302) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (302) indicated by the bandwidth part indicator in the received DCI.

[0077] As described above, since DCI-based bandwidth part change can be indicated by DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth part change request, it must be able to receive or transmit PDSCH or PUSCH scheduled by the corresponding DCI without difficulty in the changed bandwidth part. To this end, the standard stipulates the delay time (T) required when changing the bandwidth part. BWP ) and can be defined as in [Table 3] below, for example.

[0078] [Table 3]

[0079]

[0080] The bandwidth-partial change delay time requirement supports Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth-partial delay time type to the base station.

[0081] According to the requirement for bandwidth part change delay time mentioned above, when the terminal receives DCI including bandwidth part change indicator in slot n, the terminal changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T. BWP The completion can be done at a later time, and transmission and reception for the data channel scheduled by the DCI can be performed in the new bandwidth portion that has been changed. When the base station wants to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP ), time domain resource allocation for the data channel can be determined. That is, when the base station schedules the data channel with a new bandwidth portion, the data channel can be scheduled after the bandwidth portion change delay time in the method of determining the time domain resource allocation for the data channel. Accordingly, the terminal can determine whether the DCI instructing the bandwidth portion change is after the bandwidth portion change delay time (TBWP ) may not be expected to indicate a slot offset (K0 or K2) value smaller than that.

[0082] If the terminal receives DCI (e.g., DCI format 1_1 or 0_1) indicating a bandwidth change, the terminal may not perform any transmission or reception during the time period from the third symbol of the slot in which the PDCCH including the DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the terminal receives DCI indicating a bandwidth change in slot n and the slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0083] [QCL, TCI state]

[0084] In a wireless communication system, one or more different antenna ports (or one or more channels, signals, and combinations thereof, but for convenience, they will be referred to as different antenna ports in the following description of the present disclosure) can be associated with each other by QCL (Quasi co-location) settings as shown in [Table 4] below. The TCI state is to notify the QCL relationship between the PDCCH (or PDCCH DMRS) and other RSs or channels. When a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are QCLed with each other, it means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at the antenna port A to the channel measurement from the antenna port B. QCL may need to relate different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Accordingly, NR supports four types of QCL relationships, as shown in [Table 4] below.

[0085] [Table 4]

[0086]

[0087] The above spatial RX parameter may collectively refer to some or all of 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, and spatial channel correlation.

[0088] The above QCL relationship can be set to the terminal through the RRC parameters TCI-State and QCL-Info as shown in Table 9 below. Referring to [Table 5], the base station can set one or more TCI states to the terminal and inform the RS referencing the ID of the TCI state, i.e., up to two QCL relationships (qcl-Type1, qcl-Type2) for the target RS. At this time, each QCL information (QCL-Info) included in the above 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 4] above.

[0089] [Table 5]

[0090]

[0091] Figure 4 is a diagram illustrating an example of base station beam allocation according to TCI state settings.

[0092] Referring to FIG. 4, the base station can transmit information about N different beams to the terminal through N different TCI states. For example, in case of N=3 as shown in FIG. 4, the base station can notify that the antenna ports referencing the different TCI states 400, 405, or 410 have different spatial Rx parameters, i.e., are associated with different beams, by setting the qcl-Type2 parameter included in the three TCI states (400, 405, 410) to be associated with the CSI-RS or SSB corresponding to the different beams and to QCL type D.

[0093] Tables 6 to 10 below show valid TCI state settings according to target antenna port type.

[0094] [Table 6] shows valid TCI state settings when the target antenna port is CSI-RS for tracking (i.e., TRS). The TRS refers to NZP CSI-RS with the repetition parameter not set and trs-Info set to true among CSI-RSs. Setting 3 in Table 10 can be used for aperiodic TRS.

[0095] [Table 6]

[0096] Set a valid TCI state when the target antenna port is CSI-RS for tracking (TRS).

[0097]

[0098] [Table 7] shows valid TCI state settings when the target antenna port is a CSI-RS for CSI. The CSI-RS for CSI refers to an NZP CSI-RS in which a parameter indicating repetition (e.g., repetition parameter) is not set among the CSI-RSs and trs-Info is not set to true.

[0099] [Table 7]

[0100] Set a valid TCI state when the target antenna port is CSI-RS for CSI.

[0101]

[0102] [Table 8] shows the valid TCI state settings when the target antenna port is CSI-RS for beam management (BM, which has the same meaning as CSI-RS for L1 RSRP reporting). The CSI-RS for BM refers to an NZP CSI-RS in which the repetition parameter is set to On or Off among CSI-RSs and trs-Info is not set to true.

[0103] [Table 8]

[0104] Set a valid TCI state when the target antenna port is CSI-RS for BM (for L1 RSRP reporting).

[0105]

[0106] [Table 9] shows the valid TCI state settings when the target antenna port is PDCCH DMRS.

[0107] [Table 9]

[0108] Set a valid TCI state when the target antenna port is PDCCH DMRS.

[0109]

[0110] [Table 10] shows the valid TCI state settings when the target antenna port is PDSCH DMRS.

[0111] [Table 10]

[0112] Set a valid TCI state when the target antenna port is PDSCH DMRS.

[0113]

[0114] A representative QCL setting method according to the above [Table 6] to [Table 10] is to set and operate the target antenna port and reference antenna port for each step as "SSB" -> "TRS" -> "CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS." Through this, it is possible to link statistical characteristics that can be measured from SSB and TRS to each antenna port to assist the terminal's receiving operation.

[0115] [Unified TCI state]

[0116] Hereinafter, a single TCI state indication and activation method based on the unified TCI scheme is described. The unified TCI scheme can refer to a method of integrating and managing the transmission and reception beam management methods, which were distinguished into the TCI state method used for downlink reception of the terminal in the existing Rel-15 and 16 and the spatial relation info method used for uplink transmission, into a TCI state. Therefore, when the terminal is instructed by the base station based on the unified TCI scheme, it can perform beam management using the TCI state even for uplink transmission. If the terminal has set a TCI-State, which is an upper layer signaling with the tci-stateId-r17, which is an upper layer signaling, from the base station, the terminal can perform operations based on the unified TCI scheme using the corresponding TCI-State. The TCI-State can exist in two forms: a joint TCI state or a separate TCI state.

[0117] The first type is a joint TCI state, and the terminal can be instructed by the base station to use both the TCI state to apply to uplink transmission and downlink reception through a single TCI-State. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type1 in the TCI-State based on the joint TCI state to instruct the parameters to use for downlink channel estimation, and the RS corresponding to qcl-Type2 to instruct the parameters to use as a downlink reception beam or reception filter. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL / UL TCI state to instruct the parameters to use as an uplink transmission beam or transmission filter. In this case, if the terminal is instructed to use a joint TCI state, the terminal can apply the same beam to both uplink transmission and downlink reception.

[0118] The second form is a separate TCI state, in which the terminal can be individually instructed by the base station to select a UL TCI state to apply to uplink transmission and a DL TCI state to apply to downlink reception. If the terminal is instructed to select a UL TCI state, the terminal can be instructed to select parameters to use as an uplink transmission beam or transmission filter using the reference RS or source RS configured in the UL TCI state. If the terminal is instructed to select a DL TCI state, the terminal can be instructed to select parameters to use for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the DL TCI state, and to select parameters to use as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2.

[0119] If the terminal is instructed with both the DL TCI state and the UL TCI state, the terminal can be instructed with parameters to be used as an uplink transmission beam or a transmission filter using the reference RS or source RS set in the corresponding UL TCI state, and can be instructed with parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 set in the corresponding DL TCI state, and can be instructed with parameters to be used as a downlink reception beam or a reception filter using the RS corresponding to qcl-Type2. In this case, if the reference RS or source RS set in the DL TCI state and UL TCI state to which the terminal is instructed are different, the terminal can individually apply beams to uplink transmission and downlink reception, respectively, based on the instructed UL TCI state and DL TCI state.

[0120] A terminal can receive a joint TCI state from a base station for each bandwidth part within a specific cell through upper layer signaling up to 128 times, and among the separate TCI states, a DL TCI state can be set for each bandwidth part within a specific cell up to 64 or 128 times through upper layer signaling based on a terminal capability report. Among the separate TCI states, the DL TCI state and the joint TCI state can use the same upper layer signaling structure. For example, if 128 joint TCI states are set and 64 DL TCI states are set among the separate TCI states, the 64 DL TCI states can be included in the 128 joint TCI states.

[0121] Among the separate TCI states, the UL TCI state can be set to a maximum of 32 or 64 upper layer signaling for each specific bandwidth part within a specific cell based on the terminal capability report, and like the relationship between the DL TCI state and the joint TCI state among the separate TCI states, the UL TCI state and the joint TCI state among the separate TCI can also use the same upper layer signaling structure, and the UL TCI state among the separate TCI can use different upper layer signaling structures from the joint TCI state and the DL TCI state among the separate TCI states.

[0122] The use of different or identical upper layer signaling structures may be defined in the specification, or may be distinguished through another upper layer signaling established by the base station based on a terminal capability report containing information on which of the two usage modes the terminal can support.

[0123] The terminal can receive transmission and reception beam-related instructions in an integrated TCI manner using one of the joint TCI state and separate TCI state configured by the base station. The terminal can be configured by the base station via upper layer signaling whether to use either the joint TCI state or separate TCI state.

[0124] The terminal receives transmission / reception beam-related instructions using one of the methods selected from the joint TCI state and the separate TCI state through upper layer signaling. At this time, there can be two transmission / reception beam instruction methods from the base station: a MAC-CE-based instruction method and a MAC-CE-based activation and DCI-based instruction method.

[0125] If a terminal receives a transmission / reception beam-related instruction using a joint TCI state method through upper layer signaling, the terminal can perform a transmission / reception beam application operation by receiving a MAC-CE indicating the joint TCI state from a base station, and the base station can schedule reception of a PDSCH including the MAC-CE through a PDCCH for the terminal. If the MAC-CE includes one joint TCI state, the UE can use the indicated joint TCI state to determine the uplink transmission beam or transmission filter and the downlink reception beam or reception filter starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. If the MAC-CE includes two or more joint TCI states, the UE can confirm that the multiple joint TCI states indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful, and activate the indicated joint TCI state. Afterwards, the UE can receive DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may or may not include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0126] If a terminal receives an instruction related to a transmit / receive beam using a separate TCI state method through upper layer signaling, the terminal can perform a transmit / receive beam application operation by receiving a MAC-CE indicating a separate TCI state from a base station, and the base station can schedule reception of a PDSCH including the corresponding MAC-CE to the terminal through a PDCCH. If the MAC-CE includes only one set of separate TCI states, the terminal can determine an uplink transmit beam or transmit filter and a downlink receive beam or receive filter using the separate TCI states included in the indicated separate TCI state set starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the corresponding PDSCH was successful. At this time, the separate TCI state set may mean single or multiple separate TCI states that one code point of the TCI state field in DCI format 1_1 or 1_2 can have, and one separate TCI state set may include one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state. If there are two or more separate TCI state sets included in the MAC-CE, the UE may confirm that the multiple separate TCI state sets indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting from 3 ms after transmitting the PUCCH including HARQ-ACK information indicating whether reception for the corresponding PDSCH was successful, and may activate the indicated separate TCI state set.At this time, each code point of the TCI state field of DCI format 1_1 or 1_2 can indicate one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state each. The terminal can receive DCI format 1_1 or 1_2 and apply a separate set of TCI states indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0127] FIG. 5 is a diagram illustrating beam application times that may be considered when using an integrated TCI scheme in a wireless communication system according to an embodiment of the present disclosure. As described above, a terminal may receive DCI format 1_1 or 1_2 from a base station, including (with DL assignment) or not including (without DL assignment) downlink data channel scheduling information, and apply one joint TCI state or a set of separate TCI states indicated by the TCI state field in the corresponding DCI to uplink transmission and downlink reception beams.

[0128] - DCI format 1_1 or 1_2 with DL assignment (500): If the terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from the base station (501) and indicates one joint TCI state or a separate TCI state set based on the integrated TCI method, the terminal receives a PDSCH scheduled based on the received DCI (505), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH was successful (510). At this time, the HARQ-ACK can include the meaning of whether reception of both the DCI and the PDSCH was successful, and if at least one of the DCI and the PDSCH was not received, the terminal can transmit a NACK, and if reception of both was successful, the terminal can transmit an ACK.

[0129] - DCI format 1_1 or 1_2 without DL assignment (550): If the terminal receives DCI format 1_1 or 1_2 from the base station that does not include downlink data channel scheduling information (555) and indicates one joint TCI state or a set of separate TCI states based on the integrated TCI method, the terminal may assume at least one combination of the following for the corresponding DCI.

[0130] ■ Includes scrambled CRC using CS-RNTI.

[0131] ■ The value of all bits assigned to all fields used as RV (Redundancy Version) fields is 1.

[0132] ■ The value of all bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields is 1.

[0133] ■ The value of all bits assigned to all fields used as NDI (New Data Indication) fields is 0.

[0134] ■ For FDRA (Frequency Domain Resource Allocation) Type 0, the value of all bits allocated to the FDRA field is 0, for FDRA Type 1, the value of all bits allocated to the FDRA field is 1, and when the FDRA method is dynamicSwitch, the value of all bits allocated to the FDRA field is 0.

[0135] The terminal can transmit a PUCCH including a HARQ-ACK indicating whether reception was successful for the DCI format 1_1 or 1_2 assuming the above-described matters (560).

[0136] - For both DCI format 1_1 or 1_2 with DL assignment (500) and without DL assignment (550), if a new TCI state indicated through DCI (501, 555) is the same as a TCI state that has already been indicated and applied to an uplink transmission and downlink reception beam, the UE can maintain the previously applied TCI state, and if the new TCI state is different from the previously indicated TCI state, the UE can determine the application time of a joint TCI state or a separate TCI state set that can be indicated from the TCI state field included in the DCI as the time after the first slot (520, 570) after the time equal to BAT (beam application time, 515, 565) after the PUCCH transmission (530, 580), and can use the previously indicated TCI-state until (525, 575) before the corresponding slot (520, 570).

[0137] - For both DCI format 1_1 or 1_2 with DL assignment (500) and without DL assignment (550), the BAT can be set by upper layer signaling based on terminal capability report information as a specific number of OFDM symbols, and the numerology for the BAT and the first slot after the BAT can be determined based on the smallest numerology among all cells to which the joint TCI state or separate TCI state set indicated through the DCI is applied.

[0138] A terminal can apply one joint TCI state indicated via MAC-CE or DCI to reception of control resource sets connected to all terminal-specific search spaces, reception of PDSCHs scheduled as PDCCHs transmitted from the control resource sets, transmission of PUSCHs, and transmission of all PUCCH resources.

[0139] A terminal may apply one separate TCI state set, if one separate TCI state set indicated via MAC-CE or DCI includes one DL TCI state, to reception for control resource sets connected to all terminal-specific search spaces, to reception for PDSCH scheduled with PDCCH transmitted from the control resource set, and to all PUSCH and PUCCH resources based on the previously indicated UL TCI state.

[0140] A terminal can apply a single separate TCI state set indicated via MAC-CE or DCI to all PUSCH and PUCCH resources if it includes a single UL TCI state, and can apply a single TCI state to all control resource sets connected to a specific search space based on the previously indicated DL ...

[0141] When a separate set of TCI states indicated via MAC-CE or DCI includes one DL TCI state and one UL TCI state, the terminal may apply the DL TCI state to reception for all control resource sets associated with the terminal-specific search space and to reception for PDSCH scheduled with PDCCH transmitted from the control resource set, and may apply the UL TCI state to all PUSCH and PUCCH resources.

[0142] [Unified TCI state MAC-CE]

[0143] Hereinafter, a single TCI state indication and activation method based on the integrated TCI scheme is described. The terminal receives a PDSCH including the following MAC-CE from the base station, and from 3 slots after transmitting a HARQ-ACK for the corresponding PDSCH to the base station, the terminal can interpret each code point of the TCI state field in DCI format 1_1 or 1_2 based on the information in the MAC-CE received from the base station. That is, the terminal can activate each entry of the MAC-CE received from the base station to each code point of the TCI state field in DCI format 1_1 or 1_2.

[0144] FIG. 6 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or separate DL or UL TCI state in a wireless communication system according to an embodiment of the present disclosure. The meaning of each field within the MAC-CE structure may be as follows.

[0145] - Serving Cell ID (600): This field can indicate which serving cell the MAC-CE is applied to. The length of this field can be 5 bits. If the serving cell indicated by this field is included in one or more of the upper layer signaling simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0146] - DL BWP ID (605): This field can indicate to which DL BWP the corresponding MAC-CE applies, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0147] - UL BWP ID (610): This field can indicate which UL BWP the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0148] - P i (615): This field can indicate whether each code point in the TCI state field in DCI format 1_1 or 1_2 has multiple TCI states or a single TCI state. If P i If the value of is 1, it means that the corresponding i-th code point has multiple TCI states, which may mean that the corresponding code point may contain a separate DL TCI state and a separate UL TCI state. If P i If the value is 0, it means that the corresponding ith code point has a single TCI state, which may mean that the corresponding code point may contain either a joint TCI state, a separate DCI TCI state, or a separate UL TCI state.

[0149] - D / U (620): This field can indicate whether the TCI state ID field in the same octet is a joint TCI state, a separate DL TCI state, or a separate UL TCI state. If this field is 1, the TCI state ID field in the same octet can be a joint TCI state or a separate DL TCI state, and if this field is 0, the TCI state ID field in the same octet can be a separate UL TCI state.

[0150] - TCI state ID (625): This field can indicate a TCI state that can be identified by the upper layer signaling TCI-StateId. If the D / U field is set to 1, this field can be used to express the TCI-StateId, which can be expressed in 7 bits. If the D / U field is set to 0, the MSB (most significant bit) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the upper layer signaling UL-TCIState-Id. The maximum number of TCI states that can be activated can be 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0151] - R: Indicates reserved bit and can be set to 0.

[0152] For the MAC-CE structure of FIG. 6 described above, the terminal can include the third octet including the P1, P2, ..., P8 fields in FIG. 6 in the MAC-CE structure, regardless of whether unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint or separate. In this case, the terminal can perform TCI state activation using the fixed MAC-CE structure regardless of the upper layer signaling set by the base station. As another example, for the MAC-CE structure of FIG. 6 described above, the terminal can omit the third octet including the P1, P2, ..., P8 fields in FIG. 6 when unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint. In this case, the terminal can save up to 8 bits of the payload of the corresponding MAC-CE according to the upper layer signaling set by the base station. In addition, all D / U fields located from the fourth octet to the first bit in Fig. 6 can be regarded as R fields, and all corresponding R fields can be set to 0 bits.

[0153] [PDCCH: DCI related]

[0154] Next, we will specifically explain downlink control information (DCI) in 5G systems.

[0155] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields defined between the base station and the terminal, and the non-fallback DCI format can include configurable fields.

[0156] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after going through the channel coding and modulation process. 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 UE. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process. When the UE receives a DCI message transmitted on the PDCCH, it verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can determine that the message was transmitted to the UE.

[0157] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0158] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 11] below.

[0159] [Table 11]

[0160]

[0161] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include, for example, the information in [Table 12] below.

[0162] [Table 12]

[0163]

[0164]

[0165] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 13] below.

[0166] [Table 13]

[0167]

[0168] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 14] below.

[0169] [Table 14]

[0170]

[0171] [PDCCH: CORESET, REG, CCE, Search Space]

[0172] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0173] FIG. 7 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G communication system. FIG. 7 illustrates an example in which two control regions (Control Region #1 (701), Control Region #2 (702)) are set within a UE bandwidth part (710) in the frequency axis and within one slot (720) in the time axis. The control regions (701, 702) may be set to specific frequency resources (703) within the entire UE bandwidth part (710) in the frequency axis. The time axis may be set to one or more OFDM symbols, which may be defined as the control region length (Control Resource Set Duration, 704). Referring to the example illustrated in FIG. 7, Control Region #1 (701) is set to a control region length of two symbols, and Control Region #2 (702) is set to a control region length of one symbol.

[0174] In the aforementioned 5G, the control region can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, the frequency location of the control region, and the symbol length of the control region. For example, this information may include the information in [Table 15] below.

[0175] [Table 15]

[0176]

[0177] In [Table 15], the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control region.

[0178] FIG. 8 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G. According to FIG. 8, the basic unit of time and frequency resources that constitute a control channel can be referred to as a REG (Resource Element Group, 803), and a REG (803) can be defined as 1 OFDM symbol (801) on the time axis and 1 PRB (Physical Resource Block, 802) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (803) to constitute a downlink control channel allocation unit.

[0179] As illustrated in FIG. 8, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 804), 1 CCE (804) can be composed of multiple REGs (803). Taking the REG (803) illustrated in FIG. 8 as an example, the REG (803) can be composed of 12 REs, and if 1 CCE (804) is composed of 6 REGs (803), 1 CCE (804) can be composed of 72 REs. When a downlink control region is set, the region can be composed of multiple CCEs (804), and a specific downlink control channel can be mapped to one or multiple CCEs (804) and transmitted according to the aggregation level (AL) within the control region. CCEs (804) within the control area are distinguished by numbers, and the numbers of the CCEs (804) can be assigned according to a logical mapping method.

[0180] The basic unit of the downlink control channel illustrated in FIG. 8, that is, the REG (803), may include both the REs to which the DCI is mapped and the areas to which the DMRS (805), which is a reference signal for decoding the REs, is mapped. As shown in FIG. 8, three DMRSs (805) may be transmitted within one REG (803). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL = L, one downlink control channel may 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. A search space is a set of downlink control channel candidates (CCEs) that a terminal must attempt to decode at a given aggregation level. Since there are multiple aggregation levels, each of which can be a set of 1, 2, 4, 8, or 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0181] Search spaces can be categorized into common search spaces and UE-specific search spaces. 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 of system information or paging messages. For example, PDSCH scheduling allocation information for transmitting SIBs, including cell operator information, can be received by searching the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's identity and various system parameters.

[0182] In 5G, parameters for the search space for PDCCH can be configured from the base station to the terminal via higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the information in [Table 16] below can be included.

[0183] [Table 16]

[0184]

[0185]

[0186] Depending on the configuration information, the base station may configure one or more search space sets for the terminal. In some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure the terminal to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and may configure the terminal to monitor DCI format B scrambled with Y-RNTI in search space set 2 in a terminal-specific search space.

[0187] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0188] In the common search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these.

[0189] - 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

[0190] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0191] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0192] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0193] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0194] In a terminal-specific search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these examples.

[0195] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0196] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0197] The RNTIs specified may follow the definitions and uses below.

[0198] C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0199] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0200] CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0201] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0202] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0203] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0204] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is punctured.

[0205] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0206] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0207] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0208] The aforementioned specified DCI formats may follow the definitions in [Table 17] below.

[0209] [Table 17]

[0210]

[0211] In 5G, the search space of aggregation level L in the control region p and search space set s can be expressed as in [Mathematical Formula 1] below.

[0212] [Mathematical Formula 1]

[0213]

[0214] - : Integration level

[0215] - : Carrier Index

[0216] - : Total number of CCEs existing within the control region p

[0217] - : slot index

[0218] - : Number of PDCCH candidates for aggregation level L

[0219] - = 0, ..., -1: PDCCH candidate index of aggregation level L

[0220] - i = 0, ..., -1

[0221] - , , , , ,

[0222] - : Terminal identifier

[0223] The value can be 0 for a common search space.

[0224] In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's identity (C-RNTI or ID set to the terminal by the base station) and the time index.

[0225] In 5G, since multiple search space sets can be configured with different parameters (e.g., parameters in [Table 16]), the set of search space sets monitored by a terminal at each point in time can be different. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific slot, or can monitor either search space set #1 or search space set #2 in a specific slot.

[0226] [PUSCH: Transmission method related]

[0227] Next, we describe the scheduling method for PUSCH transmission. PUSCH transmission can be dynamically scheduled by the UL grant within the DCI or can operate by configured grant Type 1 or Type 2. Dynamic scheduling instructions for PUSCH transmission are possible in DCI format 0_0 or 0_1.

[0228] Configured grant Type 1 PUSCH transmission can be semi-statically configured by receiving configuredGrantConfig including rrc-ConfiguredUplinkGrant of [Table 18] through higher-order signaling, without receiving UL grant in DCI. Configured grant Type 2 PUSCH transmission can be semi-persistently scheduled by UL grant in DCI after receiving configuredGrantConfig not including rrc-ConfiguredUplinkGrant of [Table 18] through higher-order signaling. When PUSCH transmission operates by configured grant, parameters applied to PUSCH transmission are applied through configuredGrantConfig of higher-order signaling of [Table 18], except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by pusch-Config of [Table 19]. If the terminal has been provided with transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 18], the terminal applies tp-pi2BPSK in pusch-Config of [Table 19] to PUSCH transmission operated by the configured grant.

[0229] [Table 18]

[0230]

[0231] Next, the PUSCH transmission method is 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 or a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in the upper signaling, pusch-Config in [Table 19], is 'codebook' or 'nonCodebook'.

[0232] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured by configured grant. If the UE is instructed to schedule PUSCH transmission via DCI format 0_0, the UE performs beam configuration for PUSCH transmission using pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the activated uplink BWP within the serving cell, and the PUSCH transmission is based on a single antenna port. The UE does not expect scheduling for PUSCH transmission via DCI format 0_0 within a BWP where a PUCCH resource including pucch-spatialRelationInfo is not configured. If the UE does not configure txConfig in pusch-Config of [Table 19], the UE does not expect to be scheduled with DCI format 0_1.

[0233] [Table 19]

[0234]

[0235] Next, we describe codebook-based PUSCH transmission. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or can operate semi-statically based on a configured grant. When codebook-based PUSCH is dynamically scheduled via DCI format 0_1 ​​or semi-statically configured via a configured grant, the UE determines a precoder for PUSCH transmission based on the SRS Resource Indicator (SRI), Transmission Precoding Matrix Indicator (TPMI), and transmission rank (the number of PUSCH transmission layers).

[0236] At this time, the SRI can be given through the SRS resource indicator field in the DCI or configured through the srs-ResourceIndicator higher-level signaling. The UE is configured with at least one SRS resource when transmitting a codebook-based PUSCH, and can be configured with up to two. When the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. In addition, the TPMI and transmission rank can be given through the precoding information and number of layers fields in the DCI or configured through the precodingAndNumberOfLayers higher-level signaling. The TPMI is used to indicate the precoder applied to the PUSCH transmission. If the UE is configured with one SRS resource, the TPMI is used to indicate the precoder to be applied to the configured one SRS resource. When a terminal is configured with multiple SRS resources, TPMI is used to indicate the precoder to be applied in the SRS resource indicated through SRI.

[0237] The precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper layer signaling, SRS-Config. In codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and codebookSubset in the upper layer signaling, pusch-Config. The codebookSubset in the upper layer signaling, pusch-Config, 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 reported 'partialAndNonCoherent' as the UE capability, the UE does not expect the value of codebookSubset in the upper layer signaling to be set to 'fullyAndPartialAndNonCoherent'. Additionally, if the UE reports 'nonCoherent' as the UE capability, the UE does not expect the value of the upper signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports in the upper signaling SRS-ResourceSet points to two SRS antenna ports, the UE does not expect the value of the upper signaling codebookSubset to be set to 'partialAndNonCoherent'.

[0238] The terminal can be configured with one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource in the SRS resource set can be indicated via SRI. If multiple SRS resources are configured in the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal expects that the value of nrofSRS-Ports in the upper signaling SRS-Resource is set to the same value for all SRS resources.

[0239] The terminal transmits to the base station one or more SRS resources included in the SRS resource set in which the usage value is set to 'codebook' according to upper signaling, and the base station selects one of the SRS resources transmitted by the terminal and instructs the terminal to perform PUSCH transmission using transmission beam information of the corresponding SRS resource. At this time, in codebook-based PUSCH transmission, the SRI is used as information for selecting an index of one SRS resource and is included in the DCI. Additionally, the base station includes in the DCI information indicating the TPMI and rank to be used by the terminal for PUSCH transmission. The terminal performs PUSCH transmission by applying the indicated rank and the precoder indicated by the TPMI based on the transmission beam of the corresponding SRS resource using the SRS resource indicated by the SRI.

[0240] Next, we describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can operate semi-statically based on a configured grant. If at least one SRS resource is configured within an SRS resource set in which the usage value in the upper signaling, SRS-ResourceSet, is set to 'nonCodebook', the UE can be scheduled for non-codebook-based PUSCH transmission via DCI format 0_1.

[0241] For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be configured with one connected NZP CSI-RS resource (non-zero power CSI-RS). The UE can perform calculations for a precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the aperiodic SRS transmission at the UE is less than 42 symbols, the UE does not expect information about the precoder for SRS transmission to be updated.

[0242] If the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the connected NZP CSI-RS is indicated by the SRS request field in DCI format 0_1 ​​or 1_1. At this time, if the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the connected NZP CSI-RS is indicated when the value of the SRS request field in DCI format 0_1 ​​or 1_1 is not '00'. At this time, the DCI must not indicate cross-carrier or cross BWP scheduling. In addition, if the value of the SRS request indicates the presence of an NZP CSI-RS, the NZP CSI-RS is located in the slot in which the PDCCH including the SRS request field is transmitted. At this time, the TCI states set for the scheduled subcarriers are not set to QCL-TypeD.

[0243] If a periodic or semi-persistent SRS resource set is configured, the associated NZP CSI-RS can be indicated through the associatedCSI-RS within the upper-level signaling SRS-ResourceSet. For non-codebook-based transmission, the UE does not expect the upper-level signaling spatialRelationInfo for the SRS resource and the associatedCSI-RS within the upper-level signaling SRS-ResourceSet to be configured together.

[0244] When multiple SRS resources are configured, the UE 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, the SRI can be indicated through the SRS resource indicator field in the DCI or can be set through the srs-ResourceIndicator, which is a higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. The UE can use one or more 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 UE to the base station. At this time, the SRS resources that the UE simultaneously transmits occupy the same RB. The UE configures one SRS port for each SRS resource. Only one SRS resource set with the usage value set to 'nonCodebook' in the upper signaling SRS-ResourceSet can be set, and up to four SRS resources for non-codebook based PUSCH transmission can be set.

[0245] The base station transmits one NZP-CSI-RS associated with an SRS resource set to the terminal, and the terminal calculates a precoder to be used when transmitting one or more SRS resources within the SRS resource set based on the result measured upon reception of the NZP-CSI-RS. When the terminal transmits one or more SRS resources within the SRS resource set with usage set to 'nonCodebook' to the base station, the terminal applies the calculated precoder, and the base station selects one or more SRS resources from the received one or more SRS resources. At this time, in non-codebook based PUSCH transmission, the SRI represents an index that can express a combination of one or more SRS resources, and the SRI is included in the DCI. At this time, the number of SRS resources indicated by the SRI transmitted by the base station 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.

[0246] [PUSCH: Transmission Power Related]

[0247] Below, a method for determining the transmission power of an uplink data channel in a 5G system is specifically described.

[0248] In a 5G system, the transmission power of an uplink data channel can be determined using the following [Mathematical Formula 2].

[0249] [Equation 2]

[0250]

[0251] In [Mathematical Formula 2], j represents the grant type of PUSCH, and specifically, j=0 is a PUSCH grant for random access response, j=1 is a configured grant, means dynamic grant. means the maximum output power set to the terminal for carrier f of supporting cell c for PUSCH transmission occasion i. is set as a higher layer parameter and can be determined through upper layer settings and SRI (in case of dynamic grant PUSCH). It is a parameter composed of the sum of . refers to the bandwidth for resource allocation expressed as the number of resource blocks for PUSCH transmission occasion i, It means a value determined according to the MCS (Modulation Coding Scheme) and the type of information transmitted via PUSCH (e.g., whether UL-SCH is included or CSI is included, etc.). refers to a value that can be determined (in case of dynamic grant PUSCH) through upper layer settings and SRI (SRS Resource Indicator) as a value to compensate for path loss. is the reference signal index q d It means the downlink path loss estimate estimated by the terminal through the reference signal, and the reference signal index q. d The UE can decide this via higher layer configuration and SRI (in case of dynamic grant PUSCH or configured grant PUSCH based on ConfiguredGrantConfig that does not include higher layer configuration rrc-ConfiguredUplinkGrant (type 2 configured grant PUSCH)) or via higher layer configuration. can be supported in both accumulation and absolute modes as closed loop power adjustment values. If the upper layer parameter tpc-Accumulation is not set in the terminal, the closed loop power adjustment value can be determined in accumulation mode. In this case, is the closed loop power adjustment value for the previous PUSCH transmission occasion i-i0 to transmit PUSCH transmission occasion i-i0. PUSCH Transmitting PUSCH transmission occasion i from (i-i0)-1 symbols K PUSCH (i) Between symbols, the sum of the TPC command values ​​for the closed loop index l received via DCI is determined. If the upper layer parameter tpc-Accumulation is set in the terminal, is the TPC command value for the closed loop index l received via DCI. is determined. The closed loop index l can be set to 0 or 1 if the upper layer parameter twoPUSCH-PC-AdjustmentStates is set in the terminal, and its value can be determined through the upper layer configuration and SRI (in case of dynamic grant PUSCH). TPC command field and TPC value in DCI according to accumulation method and absolute method. The mapping relationship can be defined as shown in [Table 20] below.

[0252] [Table 20]

[0253]

[0254] [PUSCH: TPMI Related]

[0255] Next, we describe the TPMI (Transmit Precoding Matrix Indicator) indicated by the base station through DCI during codebook-based PUSCH transmission.

[0256] If the terminal is scheduled for 1-layer transmission using a single PUSCH antenna port by the base station via DCI or higher layer signaling, the TPMI can be defined as W=1. Otherwise, that is, if the terminal is scheduled for 1-layer or higher PUSCH scheduling using multiple PUSCH antenna ports by the base station via DCI or higher layer signaling, the TPMI W can be defined as shown in [Table 21] to [Table 27] below.

[0257] [Table 21]

[0258]

[0259] The above [Table 21] shows the TPMI of 1 layer when the terminal has two PUSCH antenna ports. In the above [Table 21], if the terminal has an asynchronous (non-coherent) antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI index 0 and 1, and if the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI index 0 to 5.

[0260] [Table 22]

[0261]

[0262] The above [Table 22] shows the TPMI for a 1-layer case where the terminal has 4 PUSCH antenna ports, transform precoding is used (i.e., DFTS-OFDM waveform is used). In the above [Table 22], if the terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indexes 0 to 3, if the terminal has a partial-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indexes 0 to 11, and if the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indexes 0 to 27.

[0263] [Table 23]

[0264]

[0265] The above [Table 23] shows the TPMI for a 1-layer case where the terminal has 4 PUSCH antenna ports, no transform precoding is used (i.e., CP-OFDM waveform is used). In the above [Table 23], if the terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indexes 0 to 3, if the terminal has a partial-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indexes 0 to 11, and if the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indexes 0 to 27.

[0266] [Table 24]

[0267]

[0268] The above [Table 24] shows a 2-layer TPMI when a terminal has two PUSCH antenna ports, no transform precoding is used (i.e., a CP-OFDM waveform is used). In the above [Table 24], if the terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal to select TPMI index 0, and if the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal to select one of TPMI index 0 to 2.

[0269] [Table 25]

[0270]

[0271] The above [Table 25] shows a 2-layer TPMI when a terminal has 4 PUSCH antenna ports, no transform precoding is used (i.e., a CP-OFDM waveform is used). In the above [Table 25], if a terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indices 0 to 5, if a terminal has a partial-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indices 0 to 13, and if a terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indices 0 to 21.

[0272] [Table 26]

[0273]

[0274] The above [Table 26] shows the TPMI for a 3-layer case where the terminal has 4 PUSCH antenna ports and no transform precoding is used (i.e., CP-OFDM waveform is used). In the above [Table 26], if the terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station may select and instruct the terminal by TPMI index 0, if the terminal has a partial-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station may select and instruct the terminal by one of TPMI indexes 0 to 2, and if the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station may select and instruct the terminal by one of TPMI indexes 0 to 6.

[0275] [Table 27]

[0276]

[0277] The above [Table 27] shows a 4-layer TPMI when a terminal has 4 PUSCH antenna ports, no transform precoding is used (i.e., a CP-OFDM waveform is used). In the above [Table 27], if a terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station may select and instruct the terminal by TPMI index 0; if a terminal has a partial-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station may select and instruct the terminal by one of TPMI indexes 0 to 2; and if a terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station may select and instruct the terminal by one of TPMI indexes 0 to 4.

[0278] [SRS related]

[0279] Next, a method for uplink channel estimation using a terminal's Sounding Reference Signal (SRS) transmission is described. The base station can configure at least one SRS configuration for each uplink BWP to convey configuration information for SRS transmission to the terminal, and can also configure at least one SRS resource set for each SRS configuration. For example, the base station and the terminal can exchange the following upper-level signaling information to convey information regarding the SRS resource set.

[0280] - srs-ResourceSetId: SRS resource set index

[0281] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0282] - resourceType: This is the time axis transmission setting of the SRS resource referenced in the SRS resource set, and can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. If set to 'periodic' or 'semi-persistent', associated CSI-RS information can be provided depending on the usage of the SRS resource set. If set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information can be provided, and associated CSI-RS information can be provided depending on the usage of the SRS resource set.

[0283] - usage: This is a setting for the usage of the SRS resource referenced in the SRS resource set, and can be set to one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

[0284] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0285] The terminal can understand that the SRS resource included in the set of SRS resource indices referenced in the SRS resource set follows the information set in the SRS resource set.

[0286] In addition, the base station and the terminal can transmit and receive upper layer signaling information to convey individual configuration information for the SRS resource. For example, the individual configuration information for the SRS resource can include time-frequency axis mapping information within the slot of the SRS resource, which can include information about frequency hopping within or between slots of the SRS resource. In addition, the individual configuration information for the SRS resource can include the time axis transmission configuration of the SRS resource, which can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This can be restricted to have the same time axis transmission configuration as the SRS resource set including the SRS resource. If the time axis transmission configuration of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (e.g., periodicityAndOffset) can additionally be included in the time axis transmission configuration.

[0287] The base station can 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 to the UE through higher layer signaling. The base station can instruct the UE to activate an SRS resource set with resourceType set to periodic through higher layer signaling, and the UE can transmit the SRS resource referenced in the activated SRS resource set. The time-frequency domain 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 the periodicityAndOffset set in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information set in the SRS resource, or the associated CSI-RS information set in the SRS resource set that includes the SRS resource. A terminal can transmit SRS resources within an activated uplink BWP for periodic SRS resources activated through upper layer signaling.

[0288] For example, a base station can activate or deactivate semi-persistent SRS transmission to a terminal through higher layer signaling. The base station can instruct the terminal to activate an SRS resource set through MAC CE signaling, and the terminal can transmit an SRS resource referenced in the activated SRS resource set. The SRS resource set activated through MAC CE signaling can be limited to an SRS resource set with resourceType set to semi-persistent. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource, and the slot mapping including the transmission period and slot offset follows the periodicityAndOffset configured in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or the associated CSI-RS information configured in the SRS resource set that includes the SRS resource. If spatial relation info is configured in an SRS resource, the spatial domain transmission filter can be determined by referring to the configuration information for spatial relation info transmitted through MAC CE signaling that activates semi-persistent SRS transmission without following it. The terminal can transmit SRS resources within the activated uplink BWP for the semi-persistent SRS resource activated through upper layer signaling.

[0289] For example, a base station can trigger aperiodic SRS transmission to a terminal via DCI. The base station can indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) via the SRS request field of the DCI. The terminal can understand that an SRS resource set including the aperiodic SRS resource trigger indicated via DCI in the aperiodic SRS resource trigger list among the configuration information of the SRS resource set has been triggered. The terminal can transmit an SRS resource referenced in the triggered SRS resource set. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource. In addition, the slot mapping of the transmitted SRS resource can be determined through a slot offset between a PDCCH including the DCI and the SRS resource, which can refer to value(s) included in a slot offset set configured in the SRS resource set. Specifically, the slot offset between the PDCCH including DCI and the SRS resource can be applied by applying the value indicated in the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set configured in the SRS resource set. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or can refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The UE can transmit the SRS resource within the activated uplink BWP for the aperiodic SRS resource triggered through the DCI.

[0290] When a base station triggers aperiodic SRS transmission to a terminal through DCI, a minimum time interval may be required between a PDCCH including the DCI that triggers aperiodic SRS transmission and the SRS to be transmitted, so that the terminal can transmit the SRS by applying configuration information for the SRS resource. The time interval for SRS transmission of the terminal can be defined as the number of symbols between the last symbol of the PDCCH including the DCI that triggers aperiodic SRS transmission and the first symbol to which the first SRS resource to be transmitted among the SRS resource(s) is mapped. The minimum time interval can be determined with reference to the PUSCH preparation procedure time required for the terminal to prepare for PUSCH transmission. In addition, the minimum time interval can have different values ​​depending on the usage of the SRS resource set including the SRS resource to be transmitted. For example, the minimum time interval can be determined as N2 symbols, which are defined by considering the terminal processing ability according to the capability of the terminal with reference to the PUSCH preparation procedure time of the terminal. In addition, considering the usage of the SRS resource set including the SRS resource being transmitted, if the usage of the SRS resource set is set to 'codebook' or 'antennaSwitching', the minimum time interval can be set to N2 symbols, and if the usage of the SRS resource set is set to 'nonCodebook' or 'beamManagement', the minimum time interval can be set to N2+14 symbols.The terminal may transmit an aperiodic SRS if the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and may ignore the DCI that triggers the aperiodic SRS if the time interval for aperiodic SRS transmission is less than the minimum time interval.

[0291] [Table 28]

[0292]

[0293] The spatialRelationInfo setting information in [Table 28] above refers to a single reference signal and applies the beam information of the reference signal to the beam used for the corresponding SRS transmission. For example, the spatialRelationInfo setting may include information such as [Table 29] below.

[0294] [Table 29]

[0295]

[0296] Referring to the above spatialRelationInfo setting, the index of the reference signal to be referenced in order to use the beam information of a specific reference signal, i.e., the SS / PBCH block index, CSI-RS index, or SRS index can be set. The upper signaling referenceSignal is setting information indicating which beam information of which reference signal is to be referenced for the corresponding SRS transmission, ssb-Index means the index of the SS / PBCH block, csi-RS-Index means the index of the CSI-RS, and srs means the index of the SRS, respectively. 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 the ssb-Index as the transmission beam of the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the terminal can apply the reception beam used when receiving the CSI-RS corresponding to the csi-RS-Index as the transmission beam of the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'srs', the terminal can apply the transmission beam used when transmitting the SRS corresponding to the srs as the transmission beam for the corresponding SRS transmission.

[0297] [SRS: How to set comb offset / cyclic shift]

[0298] Next, the method of setting the comb offset and cyclic shift when transmitting the Sounding Reference Signal (SRS) of the terminal is described.

[0299] The terminal can be configured with SRS resources from the base station through upper layer signaling, SRS-Resource or SRS-PosResource, and can be configured with the following items.

[0300] - In the case of SRS-Resource, the terminal can set the number of antenna ports for each SRS resource, and the value is It can be defined as and can be set through upper layer signaling nrofSRS-Ports or nrofSRS-Ports-n8. If the upper layer signaling usage in SRS-ResourceSet is set to a value other than nonCodebook, can mean the number of the i-th antenna port, and i is 0 to can be an integer. If the upper layer signaling usage within the SRS-ResourceSet is set to nonCodebook, each SRS resource The antenna ports of the i+1th SRS resource in the SRS-ResourceSet can be set. can be defined as SRS-PosResource. can be defined as

[0301] - The terminal can be configured for the number of consecutive symbols in which SRS is transmitted through nrofSymbols in resourceMapping, which is a higher layer signaling from the base station, and the value is can be defined as

[0302] - The terminal can be configured for the position of the start symbol where the SRS is transmitted within a slot through the startPosition in the resourceMapping, which is a higher layer signaling from the base station, and the value is can be defined as . At this time, can mean the number of symbols in the slot, and its value can be 14 for the normal cyclic prefix or 12 for the extended cyclic prefix. can mean an offset value that counts the number of symbols backwards from the symbol located at the very end of the slot. At this time, can satisfy.

[0303] - may mean the starting position of the frequency resource where the SRS is transmitted.

[0304] An SRS sequence that can be generated through an SRS resource defined based on the above information can be defined as in [Mathematical Formula 3] below.

[0305] [Equation 3]

[0306]

[0307] At this time, means the length of the SRS sequence. is determined through [Table 31] below, and can be determined through upper layer signaling, b-SRS and c-SRS. In this case, when b-SRS is set, in [Table 31] below, You can determine the value, The value of b, which is the subscript of , can be determined, and if b-SRS is not set, It can be. c-SRS is in [Table 31] below. You can determine the value. can be determined via FreqScalingFactor, which is a higher layer signaling, and if that parameter is not set, It can be. The terminal can expect the length of the SRS sequence to be a multiple of 6 when the upper layer signaling FreqScalingFactor is set.

[0308] can be defined as, can determine the size of the comb. At this time, the size of the comb can mean the interval between REs where the SRS is transmitted on the frequency resource. For example, the size of the comb This may mean that the spacing between REs where SRS is transmitted is 2 REs. The terminal can be configured for the size of the Comb through the upper layer signaling, transmissionComb. may mean the symbol index within the symbols in which the SRS resource is transmitted. The terminal The maximum cyclic shift value is It can be determined as shown in [Table 30].

[0309] [Table 30]

[0310]

[0311] means the cyclic shift of the i-th antenna port. And the basic sequence is It can be defined as follows:

[0312]

[0313] At this time, can mean the length of the SRS sequence. For one base sequence, different and Multiple SRS sequences can be generated depending on the value.

[0314] Multiple base sequences can be divided into groups, and the indices of the groups are can be defined as, can mean the index of the base sequence within the group. If In this case, each group can contain one base sequence, and in this case =0 can be. If In this case, each group can contain two base sequences, and in this case =0,1 can be. The definition of is the length of the sequence It may vary depending on the value of .

[0315] If the length of the basic sequence is 36 or more, i.e. When the basic sequence can be defined as follows. At this time, Is It can be the largest prime number smaller than .

[0316]

[0317]

[0318]

[0319]

[0320] If the length of the basic sequence is 6, 12, 18, 24, i.e. When the basic sequence can be defined as follows.

[0321]

[0322] At this time, The value can be defined through [Table 32] to [Table 35] below.

[0323] If the length of the base sequence is 30, i.e. =30, basic sequence can be defined as follows.

[0324]

[0325] If the terminal has the upper layer signaling nrofSRS-Ports-n8 set to ports8tdm, can be defined as follows, otherwise can be defined as

[0326] - if And If, can be defined as

[0327] - if And If, can be defined as

[0328] - When neither of the above cases is true, can be defined as

[0329] antenna port which means the cyclic shift corresponding to can be defined as follows.

[0330]

[0331] At this time, can be defined as follows.

[0332] - And When, can be defined as

[0333] - And This or that, And When, can be defined as

[0334] - When neither of the above cases is true, can be defined as

[0335] At this time, is a parameter that determines the cyclic shift value, which can be set through cyclicShift-n2, cyclicShift-n4, or cyclicShift-n8 in the upper layer signaling transmissionComb. can be determined through the above [Table 30].

[0336] and can be determined as follows.

[0337] - If the upper layer signaling nrofSRS-Ports-n8 is set to ports8tdm, = can be defined as 4, In case of If is defined as, If can be defined as follows. That is, when a terminal transmits in TDM mode for an SRS resource consisting of 8 antenna ports, the antenna port to be transmitted in the first symbol is =For 1000, 1001, 1004, 1005 respectively = Defined as 1000, 1001, 1002, 1003, and the antenna ports to be transmitted in the second symbol are =For 1002, 1003, 1006, 1007 respectively = By defining 1000, 1001, 1002, 1003, when allocating resources for 4 different antenna ports transmitted in each symbol, the resource allocation method for SRS resources consisting of 4 antenna ports can be applied as is.

[0338] - In cases other than the above, i.e. when the upper layer signaling nrofSRS-Ports-n8 is not set to ports8tdm, and can be defined as

[0339] It means the starting position in the frequency dimension of the SRS corresponding to the i-th antenna port. can be defined as follows.

[0340]

[0341] At this time, can be defined as follows.

[0342]

[0343] At this time, can be defined as follows.

[0344] - , , If, can be defined as

[0345] - , , If, can be defined as

[0346] - , , If, can be defined as

[0347] - , , If, can be defined as

[0348] - , , , If, can be defined as

[0349] - , , If, can be defined as

[0350] - , , , If, can be defined as

[0351] - For all other cases except the above, can be defined as

[0352] At this time, can be defined as follows.

[0353]

[0354] At this time, can be defined as follows.

[0355]

[0356] can be set to StartRBIndex, which is a higher layer signaling, and if not set, can be defined as

[0357] For cases where the upper layer signaling EnableStartRBHopping is set, the following and Based on the value, it can be determined through [Table 36], otherwise = can be defined as 0.

[0358]

[0359] If SRS transmission is performed based on SRS-PosResource, the above can be defined based on [Table 37] below, otherwise (if SRS transmission is performed based on SRS-Resource), can be defined as

[0360] The offset value in the frequency dimension is is a value that determines how far the SRS is transmitted in the frequency dimension from the reference position, and can be set through the upper layer signaling freqDomainShift. Comb offset value is indicated. can be set via combOffset-n2, combOffset -n4, or combOffset -n8 in the upper layer signaling transmissionComb.

[0361] As a higher layer signaling related to frequency hopping of SRS, b-hop within freqHopping can be set, and can be defined as

[0362] is a value representing the index of the frequency position, and can be defined as follows.

[0363] - if In this case, frequency hopping of SRS is not supported, and the index of frequency position is indicated. is all A symbol can have a constant value during a period and can be defined as follows:

[0364]

[0365] At this time, is a value set through the upper layer signaling freqDomainPosition, and if not set, the value can be 0.

[0366] - if In this case, frequency hopping of SRS is supported, can be defined as follows.

[0367] if If, can be defined as follows. Otherwise, can be defined as follows. At this time, is if If is even, can be defined as, and if If is odd, can be defined as silver It can be defined as 1 regardless of the value.

[0368] can be defined as a parameter that counts the number of SRS transmissions. If the terminal transmits an aperiodic SRS resource, the number of SRS transmissions within a specific slot Within the symbol can be defined as follows. At this time, S can be defined as s=2 if the upper layer signaling nrofSRS-Ports-n8 is set to ports8tdm, and s=1 otherwise. At this time, can be a value set to repetitionFactor, which is a higher layer signaling, and if not set, can be defined as

[0369] If the terminal transmits periodic or semi-persistent SRS resources, In slots that satisfy can be defined as follows.

[0370]

[0371] At this time, and can mean the period and slot offset of a periodic or semi-persistent SRS, respectively.

[0372] FIG. 9 is a diagram illustrating a method for allocating comb offset and cyclic shift during SRS transmission according to one embodiment of the present disclosure.

[0373] In the first example (900), the terminal has an SRS resource consisting of four antenna ports. (comb offset value), (cyclic shift value), (comb size value) and We can assume a situation where (maximum cyclic shift value) is set. In this case, the terminal = cyclic shift values ​​assigned for 1000 and 1002 respectively and can be defined as, = Comb offset values ​​for both 1000 and 1002 can be defined as (905). In addition, the terminal = cyclic shift values ​​assigned for 1001 and 1003 respectively and can be defined as, = Comb offset values ​​for both 1001 and 1003 can be defined as (910). Therefore, two antenna ports among the four antenna ports are assigned to the same comb offset, and in order to separate the two antenna ports within the same comb offset, the interval between the cyclic shift values ​​corresponding to the two antenna ports is set to the maximum. can be decided by

[0374] In the second example (930), the terminal has an SRS resource consisting of four antenna ports. (comb offset value), (cyclic shift value), (comb size value) and We can assume a situation where (maximum cyclic shift value) is set. In this case, the terminal = cyclic shift values ​​assigned for 1000, 1001, 1002, and 1003 respectively. , , , can be defined as, = Comb offset values ​​for all 1000, 1001, 1002, and 1003 can be defined as (935). Therefore, all four antenna ports are assigned to the same comb offset, and in order to separate the four antenna ports within the same comb offset, the interval between the cyclic shift values ​​corresponding to the four antenna ports is set to the maximum. can be decided by

[0375] In the third example (960), the terminal has an SRS resource consisting of four antenna ports. (comb offset value), (cyclic shift value), (comb size value) and We can assume a situation where (maximum cyclic shift value) is set. In this case, the terminal = cyclic shift values ​​assigned for 1000 and 1002 respectively and can be defined as, = Comb offset values ​​for both 1000 and 1002 can be defined as (965). In addition, the terminal = cyclic shift values ​​assigned for 1001 and 1003 respectively and can be defined as, = Comb offset values ​​for both 1001 and 1003 can be defined as (970). Therefore, two antenna ports among the four antenna ports are assigned to the same comb offset, and in order to separate the two antenna ports within the same comb offset, the interval between the cyclic shift values ​​corresponding to the two antenna ports is set to the maximum. can be decided by

[0376] [Table 31]

[0377]

[0378]

[0379] [Table 32]

[0380]

[0381] [Table 33]

[0382]

[0383] [Table 34]

[0384]

[0385] [Table 35]

[0386]

[0387] [Table 36]

[0388]

[0389] [Table 37]

[0390]

[0391] [SRS: Antenna switching]

[0392] Below, SRS for antenna switching is described.

[0393] The SRS transmitted from the terminal can be used by the base station to acquire DL CSI (Channel State Information) information (e.g., DL CSI acquisition). As a specific example, in a single cell or multi-cell (e.g., carrier aggregation (CA)) situation based on TDD (Time Division Duplex), the BS (Base Station) can schedule the transmission of SRS to the UE (User Equipment) and then measure the SRS transmitted from the UE. In this case, the base station can regard the uplink channel information estimated based on the SRS transmitted from the terminal as downlink channel information, assuming reciprocity between the DL (downlink) / UL (uplink) channels, and can perform downlink signal / channel scheduling for the terminal using this. In this case, the terminal can be configured to use antenna switching for the SRS for acquiring downlink channel information from the base station.

[0394] For example, according to the standard (e.g., 3gpp TS38.214), the usage of SRS can be set to the base station and / or terminal using a higher layer parameter (e.g., usage of RRC parameter SRS-ResourceSet). Here, the usage of SRS can be set to beam management usage, codebook transmission usage, non-codebook transmission usage, antenna switching usage, etc.

[0395] As described above, if the terminal receives the usage parameter in the upper layer signaling SRS-ResourceSet from the base station as 'antennaSwitching', the terminal can receive at least one upper layer signaling configuration from the base station according to the reported terminal capability. At this time, the terminal can report 'supportedSRS-TxPortSwitch' as ​​the terminal capability, and the value can be as follows. In the following, 'mTnR' can mean the terminal capability that supports transmission through m antennas and reception through n antennas.

[0396] - 't1r2': Terminal capability report value indicating that the terminal is capable of 1T2R operation.

[0397] - 't1r1-t1r2': Terminal capability report value indicating that the terminal is capable of 1T1R or 1T2R operation.

[0398] - 't2r4': Terminal capability report value indicating that the terminal is capable of 2T4R operation.

[0399] - 't1r4': Terminal capability report value indicating that the terminal is capable of 1T4R operation.

[0400] - 't1r6': Terminal capability report value indicating that the terminal is capable of 1T6R operation.

[0401] - 't1r8': Terminal capability report value indicating that the terminal is capable of 1T8R operation.

[0402] - 't2r6': Terminal capability report value indicating that the terminal is capable of 2T6R operation.

[0403] - 't2r8': Terminal capability report value indicating that the terminal is capable of 2T8R operation.

[0404] - 't4r8': Terminal capability report value indicating that the terminal is capable of 4T8R operation.

[0405] - 't1r1-t1r2-t1r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, or 1T4R operation.

[0406] - 't1r4-t2r4': Terminal capability report value indicating that the terminal is capable of 1T4R or 2T4R operation.

[0407] - 't1r1-t1r2-t2r2-t2r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, 2T2R, or 2T4R operation.

[0408] - 't1r1-t1r2-t2r2-t1r4-t2r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, 2T2R, 1T4R, or 2T4R operation.

[0409] - 't1r1': Terminal capability report value indicating that the terminal is capable of 1T1R operation.

[0410] - 't2r2': Terminal capability report value indicating that the terminal is capable of 2T2R operation.

[0411] - 't1r1-t2r2': Terminal capability report value indicating that the terminal is capable of 1T1R or 2T2R operation.

[0412] - 't4r4': Terminal capability report value indicating that the terminal is capable of 4T4R operation.

[0413] - 't1r1-t2r2-t4r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 2T2R, or 4T4R operation.

[0414] FIG. 10 is a diagram illustrating an SRS antenna switching operation according to one embodiment of the present disclosure.

[0415] The terminal represents a situation in which it operates in 1T4R, and may be configured with two aperiodic SRS resource sets (for example, SRS resource sets #0 and #1). The terminal may receive a PDCCH from a base station (1000), and may be instructed to trigger aperiodic SRS for SRS resource set #0 (1010) and SRS resource set #1 (1020) through the PDCCH. At this time, the slot offset value for SRS resource set #0 (1010) may be configured as slotOffset, which is a higher layer signaling, and the value is 1, and aperiodic SRS transmission for SRS resource set #0 may be performed at a position 1 slot after the slot in which the PDCCH is received (i.e., at slot #1). Additionally, the slot offset value for SRS resource set #1 (1020) can be set to slotOffset, which is a higher layer signaling, and the value is 2, so that aperiodic SRS transmission for SRS resource set #1 can be performed at a position 2 slots after the slot in which the PDCCH is received (i.e., at slot #2).

[0416] SRS resource #0 (1011) and SRS resource #1 (1012) included in SRS resource set #0 (1010) are transmitted at different OFDM symbol positions within slot #1, and at this time, Y number of OFDM symbols may exist as a guard interval between SRS resources #0 and #1 (1013). In addition, when transmitting for SRS resource #0 (1030), the terminal can perform SRS transmission by connecting one SRS port to the first receiving antenna port (1035) of the terminal, and when transmitting for SRS resource #1 (1040), the terminal can perform SRS transmission by connecting one SRS port to the second receiving antenna port (1045) of the terminal.

[0417] SRS resource #2 (1021) and SRS resource #3 (1022) included in SRS resource set #1 (1020) are transmitted at different OFDM symbol positions within slot #1, and Y number of OFDM symbols may exist as a guard interval between SRS resources #2 and #3 (1023). In addition, when transmitting for SRS resource #2 (1050), the terminal can perform SRS transmission by connecting one SRS port to the third receiving antenna port (1055) of the terminal, and when transmitting for SRS resource #3 (1060), the terminal can perform SRS transmission by connecting one SRS port to the fourth receiving antenna port (1065) of the terminal.

[0418] By connecting the above-described four SRS resources #0 to #3 to different receiving antenna ports of terminals and transmitting SRS, the terminal can transmit SRS from all different receiving antenna ports so as to obtain channel information connected to all receiving antennas of the terminal, and through this, the base station can obtain channel information between the base station and the terminal and utilize it for uplink or downlink scheduling.

[0419] [Regarding terminal capability reporting]

[0420] In LTE and NR, a terminal, while connected to a serving base station, can perform a procedure to report its supported capabilities to the base station. In the description below, this is referred to as a UE capability report.

[0421] A base station can transmit a UE capability inquiry message requesting a capability report to a connected terminal. The message can include a UE capability request for each RAT (radio access technology) type of the base station. The RAT type-specific request can include information on a combination of supported frequency bands, etc. In addition, in the case of the UE capability inquiry message, UE capabilities for multiple RAT types can be requested through a single RRC message container transmitted by the base station, or the base station can include multiple UE capability inquiry messages including UE capability requests for each RAT type and transmit them to the terminal. That is, the UE capability inquiry can be repeated multiple times in one message, and the terminal can compose a corresponding UE capability information message and report it multiple times. In the next-generation wireless communication system, a UE capability request can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity). Additionally, the terminal capability inquiry message is typically transmitted initially after the terminal is connected to the base station, but the base station may request it under any conditions when necessary.

[0422] In the above step, the terminal that receives the UE capability report request from the base station configures the terminal capability based on the RAT type and band information requested from the base station. Below is a summary of how the terminal configures the UE capability in the NR system.

[0423] 1. If the UE receives a list of LTE and / or NR bands through a UE capability request from the base station, the UE configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, it configures a candidate list of BCs for EN-DC and NR SA based on the bands requested to the base station via FreqBandList. Furthermore, the bands are prioritized in the order listed in FreqBandList.

[0424] 2. If the base station requests UE capability reporting by setting the "eutra-nr-only" flag or the "eutra" flag, the UE completely removes NR SA BCs from the list of configured BC candidates. This operation can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0425] 3. The terminal then removes fallback BCs from the BC candidate list constructed in the above step. Here, a fallback BC is a BC obtained by removing at least one band corresponding to an SCell from a random BC. This step can be omitted because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step are the final "candidate BC list."

[0426] 4. The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final "candidate BC list" above. In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report according to the preset rat-Type order (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of "candidate feature set combinations" from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The "candidate feature set combinations" above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0427] 5. Also, if the requested rat Type is eutra-nr and has an effect, featureSetCombinations are included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the NR feature set is included only in UE-NR-Capabilities.

[0428] After terminal capabilities are configured, the terminal transmits a terminal capability information message containing the terminal capabilities to the base station. Based on the terminal capabilities received from the terminal, the base station then performs appropriate scheduling and transmission / reception management for the terminal.

[0429] [Regarding setting the maximum output power of terminals supporting FR1]

[0430] As previously described in the method for determining the transmission power of the uplink data channel of the 5G system, the terminal can set the maximum output power for the carrier f of the supporting cell c. The maximum rated output power of the terminal set in this way is P CMAX,f,c (configured UE maximum output power) is defined, which is determined by the terminal within the upper and lower bounds as shown in the following [Mathematical Formula 4].

[0431] [Equation 4]

[0432]

[0433] In [Mathematical Formula 4], the lower limit value P CMAX_L,f,c and the upper limit value P CMAX_H,f,c are determined as in [Mathematical Formula 5] and [Mathematical Formula 6], respectively.

[0434] [Equation 5]

[0435]

[0436] [Equation 6]

[0437]

[0438] In [Equation 5] and [Equation 6], P EMAX,c is the base station setting p-Max IE defined in TS 38.331, or a value based on local regulations, such as the value of an additional additionalPmax field in the network signaling NR-NS-PmaxList IE.

[0439] In [Equation 5] and [Equation 6], P Powerclass is the terminal power class (UE Power Class) value defined as an example in [Table 38], and the tolerance value is not considered here.

[0440] [Table 38]

[0441]

[0442]

[0443] When IEpowerBoostPi2BPSK is set to 1, P is enabled for power class 3 capable terminals operating in TDD bands n40, n41, n77, n78 and n79 with PI / 2 BPSK modulation. EMAX,c increases by +3dB, and the terminal is P EMAX,c If >= 20 dBm, it indicates that the terminal performance during a specific evaluation period is powerBoosting-pi2BPSK support, and the percentage of symbols used for UL transmission is less than or equal to 40% (the exact evaluation period is one radio frame or more).

[0444] When IEpowerBoostPi2BPSK is set to 1, △P is provided for power class 3 capable terminals operating in TDD bands n40, n41, n77, n78 and n79 with PI / 2 BPSK modulation. PowerClass is -3dB, the terminal indicates terminal performance powerBoosting-pi2BPSK support, and the proportion of symbols used for UL transmission is less than or equal to 40% (the exact evaluation period is one radio frame or more).

[0445] △P PowerClass Is

[0446] - In the following cases, a terminal supporting power class 2 may set it to 3 dB, and a terminal supporting power class 1.5 may set it to 6 dB: a) when the base station sets the P-max value to 23 dBm or a lower value; or b) when the field of terminal capability maxUplinkDutyCycle-PC2-FR1 is empty, maxUplinkDutyCycle-PC1dot5-MPE-FR1 is empty, and the ratio of uplink symbols transmitted during the given measurement time is greater than 50%; or c) when the field of terminal capability maxUplinkDutyCycle-PC2-FR1 is not empty, and the ratio of uplink symbols transmitted during the given measurement time is greater than maxUplinkDutyCycle-PC2-FR1, as defined in TS 38.306 (where the exact measurement time is longer than one radio frame); or d) as defined in TS 38.306 (the exact measurement time is longer than one radio frame), if the field of the terminal capability maxUplinkDutyCycle-PC1dot5-MPE-FR1 is not empty and half of the rate of uplink symbols transmitted during a certain measurement time is greater than maxUplinkDutyCycle-PC1dot5-MPE-FR1.

[0447] - A terminal supporting power class 1.5 may set it to 3 dB in the following cases: a) when the base station sets the P-max value to a value between 23 dBm and 26 dBm; or b) when the field of terminal capability maxUplinkDutyCycle-PC2-FR1 is empty, maxUplinkDutyCycle-PC1dot5-MPE-FR1 is empty and the proportion of uplink symbols transmitted during the given measurement time is between 25% and 50%; or c) when the field of terminal capability maxUplinkDutyCycle-PC2-FR1 is not empty and the proportion of uplink symbols transmitted during the given measurement time is between maxUplinkDutyCycle-PC2-FR1 and maxUplinkDutyCycle-PC2-FR1 as defined in TS 38.306 (the exact measurement time is longer than one radio frame); or d) as defined in TS 38.306 (the exact measurement time is longer than one radio frame), if the field of the terminal capability maxUplinkDutyCycle-PC1dot5-MPE-FR1 is not empty and the rate of uplink symbols transmitted during a certain measurement time is greater than maxUplinkDutyCycle-PC1dot5-MPE-FR1.

[0448] - In the following cases, when the terminal is set to SUL configurations and the requirements of the basic power class according to terminal capability maxUplinkDutyCycle-SULcombination-PC2 are applied in the band where the terminal indicates power class 2, it is 3 dB.

[0449] - When a terminal supporting power class 2 or a terminal supporting power class 1.5 additionally indicates the SRS-TxSwitch function 't1r2' or 't1r4' or 't1r1-t1r2' or 't1r1-t1r2-t1r4', 3 dB is applied to SRS transmissions in which the SRS-ResourceSet usage is set to 'antennaSwitching' with SRS resources configured in each SRS resource set(s).

[0450] - In other cases, 0dB applies.

[0451] △T IB,c is an additional tolerance for serving cell c, if none is present, △T IB,c is 0dB. If the UE supports multiple band combinations such as simultaneous operation, CA, SUL or DC for the V2X operating band and the operating band belongs to more than one band combination, then:

[0452] - If the frequency range of the operating band is 1 GHz or less, the applicable additional △T IB,c shall be the average value for all band combinations defined in this specification applicable to the operating band among the supported band combinations. If there is a harmonic relation between the low-band UL and the high-band DL, the maximum △T among the different supported band combinations that include such bands shall be IB,c must be applied.

[0453] - If the frequency range of the operating band exceeds 1 GHz, additional △T applicable IB,c shall take the maximum value for all band combinations defined in this specification for the respective operating band.

[0454] △T C,c is 1.5 dB when NOTE 3 in Table [Table 38] applies to serving cell c, otherwise △T C,c is 0dB.

[0455] MPR c is the allowable maximum power reduction value determined by the amount of uplink transmission resources (i.e. bandwidth) and modulation method allocated to the terminal for the support cell c, and A-MPR is set according to the network signal NS (network signaling) that the base station notifies the terminal for the purpose of regional regulation or avoiding adjacent band interference. f,c is an additional power relaxation value allowed by considering the frequency band in which uplink transmission is performed on carrier f of support cell c, regional characteristics, bandwidth of uplink transmission, etc.

[0456] △T when used in SRS-ResourceSet set to 'antennaSwitching' during SRS transmission RxSRS It applies as follows:

[0457] - The terminal transmits SRS through the second SRS resource in the configured SRS resource set whenever the SRS-TxSwitch feature is indicated as 't1r2' or 't1r1-t1r2'.

[0458] - The terminal transmits SRS through the second, third, and fourth SRS resources out of a total of four SRS resources in all configured SRS resource sets whenever the SRS-TxSwitch feature is indicated as 't1r4', 't1r4-t2r4', 't1r1-t1r2-t1r4', or 't1r1-t1r2-t2r2-t1r4-t2r4'. In this case, each SRS resource set consists of one SRS port.

[0459] - The terminal transmits SRS through the second SRS resource of the second SRS port pair among the two SRS port pairs in all configured SRS resource sets whenever the SRS-TxSwitch feature is indicated as 't2r4', 't1r4-t2r4', 't1r1-t1r2-t2r2-t2r4', or 't1r1-t1r2-t2r2-t1r4-t2r4'. In this case, each SRS resource set consists of two SRS ports.

[0460] - The terminal transmits SRS on the DL-only carrier.

[0461] △T RxSRS The value indicates whether the device can support Power Class 3, Power Class 5, or Power Class 1.5 in that band, or whether it supports Power Class 2 in that band and △P PowerClass = 3 dB, or if the UE points to txDiversity-r16, F UL_high F of n79 UL_low For higher bands it is 4.5 dB, F UL_high F of n79 UL_low For lower bands it is 3dB.

[0462] The terminal supports power class 2 in the band and △P PowerClass = 0 dB and does not point to txDiversity-r16, if the SRS resource configured for the SRS transmission opportunity consists of one SRS port, F UL_high F of n79 UL_low For higher bands, △T RxSRS The value is 7.5 dB, and F UL_high F of n79 UL_low For lower bands it is 6dB.

[0463] In other SRS transmissions, △T RxSRS is 0.

[0464] P-MPR cis the power management maximum output power reduction, and the terminal supports P-MPR for cell c. f,c The value can only be set if:

[0465] - For simultaneous transmission with multiple radio access technologies for scenarios outside the scope of 3GPP, to comply with applicable electromagnetic power density exposure requirements, which are regulatory-restricted human impact assessment criteria, or to address requirements such as unwanted emissions, magnetic interference, etc.

[0466] - When temporarily reducing the output through the proximity detection sensor mounted on the terminal to comply with applicable electromagnetic power density exposure requirements, which are regulatory-restricted human impact assessment criteria.

[0467] Note 1: P-MPRc is introduced in the PCMAX,f,c equation to allow the terminal to report the maximum available output transmit power to the base station, which can then use this information to make scheduling decisions.

[0468] Note 2: P-MPRc may affect the maximum uplink performance for the selected uplink transmission path.

[0469] T REF Wow T eval (Evaluation Time) is specified in [Table 39]. Each T REF P for serving cell c CMAX,L,c is T eval Each is evaluated, T eval is given as the minimum value taken for the transmission within. Then one or more T eval Minimum P for CMAX_L,f,c Go to full T REF It applies to .

[0470] [Table 39]

[0471]

[0472] Measured configured maximum output power P UMAX,f,c must be within the following ranges:

[0473] [Equation 7]

[0474]

[0475] Here P CMAX,f,c Tolerance for applicable values ​​T(PC) MAX,f,c ) is specified in [Table 40]. Tolerance T L,c is the absolute value of the lower tolerance of the specified operating band.

[0476] [Table 40]

[0477]

[0478] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. The contents of the present disclosure can be applied to FDD and TDD systems. In the present disclosure below, upper signaling (or upper layer signaling) refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of a physical layer, or a terminal transmits a signal to a base station using an uplink data channel of a physical layer, and may also be referred to as RRC signaling, PDCP signaling, or MAC (medium access control) control element (MAC control element; MAC CE or MAC-CE).

[0479] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied have a specific format, or including a specific indicator that indicates whether cooperative communication is applied, or scrambled with a specific RNTI by the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or assuming cooperative communication is applied in a specific section indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

[0480] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority.

[0481] In the present disclosure below, the above examples are described through a number of embodiments, but they are not independent and one or more embodiments may be applied simultaneously or in combination.

[0482] For convenience in the following description of the present disclosure, cells, transmission points, panels, beams, and / or transmission directions, which can be distinguished through upper layer / L1 parameters such as TCI state or spatial relation information, or indicators such as cell ID, TRP ID, and panel ID, may be uniformly described as TRP (transmission reception point), beam, or TCI state. Therefore, in actual application, TRP, beam, or TCI state may be appropriately replaced with one of the above terms.

[0483] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied have a specific format, or including a specific indicator that indicates whether cooperative communication is applied, or scrambled with a specific RNTI by the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or assuming cooperative communication is applied in a specific section indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

[0484] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Although embodiments of the present disclosure are described below using a 5G system as an example, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, this may include LTE or LTE-A wireless communication and wireless communication technologies developed after 5G. Therefore, embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure as determined by a person skilled in the art. The contents of the present disclosure are applicable to FDD and TDD systems.

[0485] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents throughout this specification.

[0486] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0487] - MIB (Master Information Block)

[0488] - SIB (System Information Block) or SIB

[0489] - RRC (Radio Resource Control)

[0490] - MAC (Medium Access Control) CE (Control Element)

[0491] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the following physical layer channels or signaling.

[0492] - PDCCH (Physical Downlink Control Channel)

[0493] - DCI (Downlink Control Information)

[0494] - UE-specific DCI

[0495] - Group common DCI

[0496] - Common DCI

[0497] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0498] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0499] - PUCCH (Physical Uplink Control Channel)

[0500] - UCI (Uplink Control Information)

[0501] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority.

[0502] The term slot used in the present disclosure below is a general term that may refer to a specific time unit corresponding to a TTI (Transmit Time Interval), and may specifically mean a slot used in a 5G NR system, or a slot or subframe used in a 4G LTE system.

[0503] The present disclosure describes a number of embodiments, but they are not independent. One or more embodiments may be applied simultaneously or in combination. For example, at least one of the first through seventh embodiments may be applied in combination. Alternatively, the embodiments of the present disclosure may be applied independently.

[0504] <First embodiment: SRS support method for codebook use for a terminal supporting three transmission antennas>

[0505] As one embodiment of the present disclosure, a method for supporting SRS for codebook purposes for a terminal supporting three transmit antennas is described. This embodiment can be operated in combination with other embodiments.

[0506] As described above, for codebook-based PUSCH transmission, the terminal can be configured with a codebook for the upper layer signaling txConfig, and can also be configured with an SRS resource set in which the upper layer signaling usage is set with a codebook from the base station, and can be configured with up to two SRS resources within the SRS resource set. In this case, one of the following methods or a combination of at least one or more may be possible for the SRS resource that can be configured for a terminal supporting three transmission antennas to transmit a codebook-based PUSCH.

[0507] [Method 1-1]

[0508] A terminal may be configured with an SRS resource consisting of four antenna ports to perform codebook-based PUSCH transmission through three antenna ports. The terminal may expect that up to two SRS resources consisting of four antenna ports are configured within an SRS resource set in which usage is set to codebook. The terminal may not perform transmission on one of the four antenna ports of the SRS resource. In this case, the antenna port on which the terminal will not transmit may be determined as the last antenna port (e.g., antenna port 1003), the first antenna port (e.g., antenna port 1000), any antenna port that can be defined in the standard (e.g., antenna port 1002), or an antenna port determined based on a notification from a base station (one or a combination of at least one of higher layer signaling, MAC-CE signaling, and L1 signaling) (for example, the base station may signal that antenna port 1002 will not be transmitted).

[0509] If the terminal does not perform transmission on the last antenna port (e.g., antenna port 1003) for an SRS resource consisting of four antenna ports, the terminal can transmit the SRS sequence generated through the above method based on the SRS resource on the allocated time and frequency resources using only the comb offset and cyclic shift values ​​allocated to antenna ports 1000, 1001, and 1002. Since the SRS transmitted by the terminal and the PUSCH antenna ports that can be scheduled by the base station based on the SRS are the same, when there are up to three antenna ports of PUSCH transmitted from the terminal, such as 1000, 1001, and 1002, considering three transmit antennas, not transmitting the last antenna port 1003 for an SRS resource with four antenna ports may be the simplest method from the perspective of a single terminal and base station that can maintain the connection between the SRS and PUSCH antenna ports, but not transmitting for a fixed antenna port may hinder the scheduling flexibility of the base station.

[0510] If the terminal does not transmit on an antenna port other than the last antenna port for an SRS resource consisting of four antenna ports, the terminal may readjust the numbers of the remaining antenna ports excluding the non-transmitting antenna port to 1000, 1001, and 1002. For example, if the terminal does not transmit on the first antenna port (e.g., antenna port 1000), the terminal may readjust the remaining antenna ports 1001, 1002, and 1003 to 1000, 1001, and 1002, respectively, and generate an SRS sequence using the above method and transmit it on the allocated time and frequency resources using the comb offset and cyclic shift values. Although readjusting the antenna port numbers in this way may be a way to maintain the connection between the SRS and PUSCH antenna ports, it may also hinder the scheduling flexibility of the base station similarly to the method described above, since it achieves the same effect as the method of not transmitting on the last antenna port described above from the perspective of allocating resources to multiple terminals at the base station.

[0511] Conversely, if the terminal does not transmit on an antenna port other than the last antenna port for an SRS resource consisting of four antenna ports, the terminal may not readjust the numbers of the remaining antenna ports excluding the non-transmitting antenna port to 1000, 1001, and 1002. For example, if the terminal does not transmit on the first antenna port (e.g., antenna port 1000), the terminal may assume that SRS is transmitted on the remaining antenna ports 1001, 1002, and 1003, generate an SRS sequence using the above method, and transmit it on the allocated time and frequency resources using the comb offset and cyclic shift values. In this case, the PUSCH antenna ports are 1000, 1001, and 1002, while the SRS antenna ports are 1001, 1002, and 1003, which breaks the assumption between the base station and the terminal that the antenna ports for PUSCH and SRS are the same, and thus definition of an additional connection relationship may be required (for example, a 1:1 connection relationship may exist between the PUSCH antenna port and the SRS antenna port, starting from the lowest antenna port number). However, from the perspective of allocating resources from the base station to multiple terminals, it may be possible to flexibly allocate antenna ports of different terminals depending on the scheduling situation.

[0512] The above [Method 1-1] can be similarly applied not only to a terminal having three transmit antennas, but also to a terminal having five, six, and seven transmit antennas when defining an SRS resource to perform codebook-based PUSCH transmission. For example, when a terminal has five, six, and seven transmit antennas, it may not perform transmission on three, two, and one antenna ports, respectively, in an SRS resource consisting of eight antenna ports, and the method of not transmitting on one antenna port among the four antenna ports can be reused to select three, two, and one antenna ports, respectively.

[0513] [Method 1-2]

[0514] To perform codebook-based PUSCH transmission through three antenna ports, the terminal can perform uplink channel estimation for the three antenna ports by using one SRS resource configured with one antenna port and one SRS resource configured with two antenna ports, respectively. The terminal can consider the SRS resource configured with one antenna port and the SRS resource configured with two antenna ports as one SRS resource group within an SRS resource set with usage set to codebook, and it is expected that up to two such SRS resource groups will be configured. For example, if a terminal is configured with a first SRS resource and a third SRS resource configured with one antenna port, and a second SRS resource and a fourth SRS resource configured with two antenna ports, the terminal may consider the first SRS resource and the second SRS resource as a first SRS resource group and use them when estimating channels for three antenna ports, and may similarly consider the third SRS resource and the fourth SRS resource as a second SRS resource group and use them when estimating channels for three antenna ports.

[0515] Instead of indicating SRS resources through the SRI field in the DCI from the base station, the terminal can indicate for each SRS resource group. For example, if the terminal is configured with the first to fourth SRS resources as described above, and the first and second SRS resources are defined as the first SRS resource group, and the third and fourth SRS resources are defined as the second SRS resource group, the terminal can assume that the first code point and the second code point of the SRI field indicate the first SRS resource group and the second SRS resource group, respectively.

[0516] [Method 1-3]

[0517] In order to perform codebook-based PUSCH transmission through three antenna ports, the terminal can define an SRS resource consisting of three antenna ports and perform uplink channel estimation for the three antenna ports. At this time, the three antenna ports that can be included in the SRS resource may be 1000, 1001, and 1002, respectively. The terminal can expect that up to two SRS resources consisting of three antenna ports are configured within an SRS resource set whose usage is set to codebook. The terminal can be configured with one comb offset and one cyclic shift value for each of the three antenna ports.

[0518] The terminal is a comb size of 2 (e.g., , that is, by the above [Table 30] ), the comb offset and cyclic shift values ​​of antenna ports 1000, 1001, and 1002 can be determined using one or a combination of at least one of the following:

[0519] - As an example, the terminal If, can be defined as and at this time can be set as upper layer signaling. That is, the terminal can transmit by distinguishing three antenna ports 1000, 1001, and 1002 with different cyclic shift values ​​at the same RE (Resource Element) location, so frequency resource allocation efficiency can be good. The terminal For the cyclic shift value, It can be defined and used as follows, and at this time can be set as upper layer signaling. For example, In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 may be 0, 2, and 5, respectively. In this case, the cyclic shift interval between antenna ports 1000 and 1001 may be 2, the cyclic shift interval between 1001 and 1002 may be 3, and the cyclic shift interval between 1002 and 1000 may be 3, which may result in unequal cyclic shift intervals and thus different channel estimation performances between antenna ports. Alternatively, the terminal may For the cyclic shift value, It can be defined and used as follows, In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 3, and 6, respectively. Similarly, in these cases, the cyclic shift interval between antenna ports 1000 and 1001 can be 3, the cyclic shift interval between 1001 and 1002 can be 3, and the cyclic shift interval between 1002 and 1000 can be 2, which may result in unequal cyclic shift intervals and thus different channel estimation performances between antenna ports.

[0520] - As an example, the terminal If, can be defined as, If, can be defined as follows. That is, the terminal transmits antenna ports 1000 and 1002 at the same RE location with different cyclic shift values, and transmits antenna port 1001 at a different RE location, so that although frequency resources are doubled, the cyclic shift interval between the two antenna ports allocated within the same RE can be maximized. The terminal For the cyclic shift value, It can be defined and used as follows. For example, , In this case, the cyclic shift values ​​for antenna ports 1000 and 1002 at comb offset 0 may be 0 and 4, respectively, and the cyclic shift value for antenna port 1001 at comb offset 1 may be 0. In this case, the cyclic shift interval between antenna ports 1000 and 1002 is 4, and antenna port 1001 is not assigned a different cyclic shift value if there is no other SRS transmission assignment from the base station, so the channel estimation performance between antenna ports may be different. In addition, even if transmission is performed at different comb offset positions, since the interval between comb offsets differs by only 1, the cyclic shift value for antenna port 1000 at comb offset 0 and the cyclic shift value for antenna port 1001 at comb offset 1, which are 0 as in the above-described method, may also be a factor that makes it difficult to distinguish them from each other during channel estimation. Therefore, the terminal The cyclic shift value of If you define and use it like this, , In this case, the cyclic shift values ​​for antenna ports 1000 and 1002 at comb offset 0 may be 0 and 4, respectively, and the cyclic shift value for antenna port 1001 at comb offset 1 may be 8. Therefore, even if the comb offsets differ by 1, the cyclic shift values ​​at each comb offset are assigned so as not to overlap each other, thereby enabling good distinction between antenna ports during channel estimation.

[0521] The terminal is a comb size of 4 (e.g., , that is, by the above [Table 30] ), one or a combination of at least one of the following may be used to determine the comb offset values ​​of antenna ports 1000, 1001, and 1002.

[0522] - As an example, the terminal If, can be defined as and at this time can be set as upper layer signaling. That is, the terminal can transmit by distinguishing three antenna ports 1000, 1001, and 1002 with different cyclic shift values ​​at the same RE location, so frequency resource allocation efficiency can be good. The terminal For the cyclic shift value, It can be defined and used as follows, and at this time can be set as upper layer signaling. For example, In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 4, and 8, respectively. In this case, since the spacing between two of the three antenna ports can be the same as 4, the channel estimation performance between the antenna ports can be similar.

[0523] - As an example, the terminal If, can be defined as, If, can be defined as follows. That is, the terminal transmits antenna ports 1000 and 1002 at the same RE location with different cyclic shift values, and transmits antenna port 1001 at a different RE location, so that although frequency resources are doubled, the cyclic shift interval between the two antenna ports allocated within the same RE can be maximized. The terminal For the cyclic shift value, It can be defined and used as follows. For example, , In this case, the cyclic shift values ​​for antenna ports 1000 and 1002 at comb offset 0 may be 0 and 6, respectively, and the cyclic shift value for antenna port 1001 at comb offset 2 may be 0. In this case, the cyclic shift interval between antenna ports 1000 and 1002 is 6, and antenna port 1001 is not assigned a different cyclic shift value if there is no other SRS transmission assignment from the base station, so the channel estimation performance between antenna ports may be different.

[0524] - As an example, the terminal If, can be defined as follows. That is, the terminal uses RE resources by transmitting at different comb offset positions for each antenna port, but since there are no other antenna ports allocated within the same RE, the base station can appropriately perform cyclic shift allocation for other SRS transmissions to maximize the cyclic shift interval. The terminal For the cyclic shift value, It can be defined and used as follows. For example, , In this case, the cyclic shift values ​​for each antenna port 1000, 1001, and 1002 at comb offsets 0, 1, and 2 may all be 0. In this case, since antenna ports 1000, 1001, and 1002 are not assigned different cyclic shift values ​​if there is no other SRS transmission assignment from the base station, the channel estimation performance between antenna ports may be similar if the base station performs different SRS transmission assignments equally for each RE. In addition, even if they are transmitted at different comb offset positions, since the interval between comb offsets differs by only one, if the cyclic shift values ​​for each antenna port 1000, 1001, and 1002 at comb offsets 0, 1, and 2 are all the same as 0, as in the above-described method, it may be difficult to distinguish them from each other during channel estimation. Therefore, the terminal The cyclic shift value of If you define and use it like this, , In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 at comb offsets 0, 1, and 2 can be 0, 4, and 8, respectively, so that even if the comb offsets differ by 1, the cyclic shift values ​​at each comb offset are assigned so as not to overlap each other, thereby enabling good distinction between antenna ports during channel estimation.

[0525] The terminal is a comb size of 8 (e.g., , that is, by the above [Table 30] ), one or a combination of at least one of the following may be used to determine the comb offset values ​​of antenna ports 1000, 1001, and 1002.

[0526] - As an example, the terminal If, can be defined as and at this time can be set as upper layer signaling. That is, the terminal can transmit by distinguishing three antenna ports 1000, 1001, and 1002 with different cyclic shift values ​​at the same RE location, so frequency resource allocation efficiency can be good. The terminal For the cyclic shift value, It can be defined and used as follows, and at this time can be set as upper layer signaling. For example, In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 2, and 4, respectively. In this case, since the spacing between two of the three antenna ports can all be the same as 2, the channel estimation performance between the antenna ports can be similar.

[0527] - As an example, the terminal If, can be defined as, If, can be defined as follows. That is, the terminal transmits antenna ports 1000 and 1002 at the same RE location with different cyclic shift values, and transmits antenna port 1001 at a different RE location, so that although frequency resources are doubled, the cyclic shift interval between the two antenna ports allocated within the same RE can be maximized. The terminal For the cyclic shift value, It can be defined and used as follows. For example, , In this case, the cyclic shift values ​​for antenna ports 1000 and 1002 at comb offset 0 may be 0 and 3, respectively, and the cyclic shift value for antenna port 1001 at comb offset 4 may be 0. In this case, the cyclic shift interval between antenna ports 1000 and 1002 is 3, and antenna port 1001 is not assigned a different cyclic shift value if there is no other SRS transmission assignment from the base station, so the channel estimation performance between antenna ports may be different.

[0528] - As an example, the terminal If, can be defined as follows. That is, the terminal uses the RE resources three times by transmitting at different comb offset positions for each antenna port, but since there are no other antenna ports allocated within the same RE, the base station can appropriately perform cyclic shift allocation for other SRS transmissions to maximize the cyclic shift interval. The terminal For the cyclic shift value, It can be defined and used as follows. For example, , In this case, the cyclic shift values ​​for each antenna port 1000, 1001, and 1002 at comb offsets 0, 2, and 4 may all be 0. In this case, since antenna ports 1000, 1001, and 1002 are not assigned different cyclic shift values ​​if there is no other SRS transmission assignment from the base station, the channel estimation performance between antenna ports may be similar if the base station performs different SRS transmission assignments equally for each RE. In addition, even if they are transmitted at different comb offset positions, since the interval between comb offsets is only two, if the cyclic shift values ​​for each antenna port 1000, 1001, and 1002 at comb offsets 0, 1, and 2 are all the same as 0, as in the above-described method, it may be difficult to distinguish them from each other during channel estimation. Therefore, the terminal The cyclic shift value of If you define and use it like this, , In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 at comb offsets 0, 1, and 2 can be 0, 2, and 4, respectively, so that even if the comb offsets differ by 2, the cyclic shift values ​​at each comb offset are assigned so as not to overlap each other, thereby enabling good distinction between antenna ports during channel estimation.

[0529] [Method 1-4]

[0530] To perform codebook-based PUSCH transmission through three antenna ports, the terminal can define an SRS resource consisting of three antenna ports and perform uplink channel estimation for the three antenna ports. At this time, the three antenna ports that can be included in the SRS resource may be 1000, 1001, and 1002, respectively. The terminal can expect that up to two SRS resources consisting of three antenna ports are configured within an SRS resource set with usage set to codebook.

[0531] The terminal can be configured with multiple comb offsets and cyclic shift values ​​for each of three antenna ports. If the terminal is configured with two comb offsets and two cyclic shift values, the terminal can apply the method of allocating the comb offset and cyclic shift for each antenna port in an SRS resource that can be configured with one antenna port using the first comb offset and the first cyclic shift value to one of the three antenna ports (for example, antenna port 1001), and can apply the method of allocating the comb offset and cyclic shift for each antenna port in an SRS resource that can be configured with two antenna ports using the second comb offset and the second cyclic shift value to two of the three antenna ports (for example, antenna ports 1000 and 1002).If the terminal is set with three comb offsets and three cyclic shift values, the terminal may apply the method of allocating the comb offset and the cyclic shift for each antenna port in an SRS resource that may be configured with one antenna port using the first comb offset and the first cyclic shift value to one of the three antenna ports (for example, antenna port 1000), may apply the method of allocating the comb offset and the cyclic shift for each antenna port in an SRS resource that may be configured with one antenna port using the second comb offset and the second cyclic shift value to one of the three antenna ports (for example, antenna port 1001), and may apply the method of allocating the comb offset and the cyclic shift for each antenna port in an SRS resource that may be configured with one antenna port using the third comb offset and the third cyclic shift value to one of the three antenna ports (for example, antenna port 1002).

[0532] The terminal may be notified by the base station of one or a combination of at least one of the above [Methods 1-1] to [Methods 1-4] through higher layer signaling, MAC-CE signaling, and L1 signaling, or may expect that one or a combination of at least one of the above [Methods 1-1] to [Methods 1-5] is fixedly defined in the standard. Additionally, if the terminal is notified by the base station of a combination of specific one or more methods through one or a combination of at least one of the above [Methods 1-1] to [Methods 1-5], it may mean that the terminal cannot support specific one or more other combinations of methods. For example, the terminal may expect that [Method 1-1] is fixedly defined in the standard, and the terminal may assume that [Method 1-1] is used to configure SRS resources during codebook-based PUSCH transmission through three antenna ports. As another example, the terminal may be notified from the base station about the above [Method 1-4] through one or a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the terminal may consider that it has been notified by the base station that the above [Method 1-1] is not supported.

[0533] The terminal may report to the base station, based on the terminal capability, whether it can support one or at least one combination of [Method 1-1] to [Method 1-4]. In this case, if the terminal reports to the base station, based on the terminal capability, that it can support a combination of one or more specific methods, it may be regarded as reporting that the terminal cannot support one or more other combinations of methods. For example, the terminal may report to the base station, based on the terminal capability, whether it can support [Method 1-1]. As another example, the terminal may report to the base station, based on the terminal capability, that it can support [Method 1-4], and this terminal capability report may mean that the terminal cannot support [Method 1-1].

[0534] <Example 2: Method for defining an uplink codebook for a terminal supporting three transmit antennas>

[0535] As one embodiment of the present disclosure, a method for defining an uplink codebook for a terminal supporting three transmit antennas is described. This embodiment can be operated in combination with other embodiments.

[0536] A terminal supporting three transmit antennas can report to the base station that codebook-based PUSCH transmission using three antenna ports is possible with the terminal capability. At this time, the terminal can report to the base station that only non-coherent transmission is possible. For this codebook-based PUSCH transmission method, the terminal can be instructed of TPMI corresponding to three antenna ports from the base station. If the terminal supports three transmit antennas, it can support non-coherent codebook. At this time, the non-coherent precoding matrix W for 1-layer, 2-layer, and 3-layer transmission using three antenna ports can be defined as shown in [Table 41], [Table 42], and [Table 43] below, respectively. In [Table 42] below, the terminal can also be instructed from the base station of a matrix in which the order of two columns of TPMI 0, 1, and 2 are swapped. For example, the terminal can swap two columns of TPMI 0 in [Table 42] below. A matrix such as the following can also be instructed from the base station. Similarly, in [Table 43] below, the terminal can also support matrices in which the order of the three columns of TPMI 0 is swapped. For example, the terminal can support matrices in which the positions of the three columns of TPMI 0 are swapped in [Table 43] below. A matrix like this can also be instructed from a base station.

[0537] [Table 41]

[0538]

[0539] [Table 42]

[0540]

[0541] [Table 43]

[0542]

[0543] <Third Embodiment: Method for Supporting SRS for Non-Codebook Uses for a Terminal Supporting Three Transmit Antennas>

[0544] As one embodiment of the present disclosure, a method for supporting SRS for non-codebook purposes for a terminal supporting three transmit antennas is described. This embodiment can be operated in combination with other embodiments.

[0545] As described above, for non-codebook-based PUSCH transmission, the terminal can receive from the base station an SRS resource set in which the upper layer signaling txConfig is set to noncodebook and the upper layer signaling usage is set to noncodebook, and can receive up to four SRS resources within the SRS resource set, and each SRS resource can be configured with one antenna port.

[0546] The terminal can receive the SRI field from the base station, and the SRI field It can be composed of bits, can mean the number of SRS resources set within the SRS resource set, and can be up to 3 as described above.

[0547] If the terminal has set maxMIMO-Layers in the upper layer signaling PUSCH-ServingCellConfig, can follow the value set to maxMIMO-Layers, otherwise, the above The maximum number of layers can be followed when the PUSCH operation is for non-codebook purposes reported by the terminal.

[0548] The terminal may additionally report the maximum number of layers for uplink transmission, in addition to 1, 2, and 4, one of 3, 5, 6, 7, and 8, or at least one combination thereof. In this case, the terminal may report the maximum number of layers that can be supported separately for codebook-based PUSCH transmission and non-codebook-based PUSCH transmission.

[0549] When the UE receives reportQuantity in the upper layer signaling CSI-ReportConfig as one of cri-RSRP-Index, ssb-Index-RSRP-Index, cri-SINR-Index, and ssb-Index-SINR-Index, it can additionally report capabilityIndex to the L1-RSRP or L1-SINR report, which can indicate the maximum number of SRS antenna ports supported by the UE, and the corresponding value can be associated with a specific panel. Through this, the base station can assume that the L1-RSRP or L1-SINR value reported by the UE is measured based on a reference signal received from a certain panel. For example, if a specific panel of the UE supports up to 2 SRS antenna ports and the UE reports the L1-RSRP received through the panel, if the UE receives reportQuantity as cri-RSRP-Index as described above, the UE can report capabilityIndex as 2.

[0550] A terminal can report its capabilities to a base station for UE capability value reporting. At this time, the terminal can report up to four values ​​to the base station, and each reported value must be a different value selected from {1, 2, 4}. For example, the terminal can report three values ​​to the base station, and the reported values ​​can be 1, 2, and 4, respectively. In another example, the terminal can report two values ​​to the base station, and the reported values ​​can be 2 and 4, respectively. The corresponding terminal capability report can be reported on a frequency band-by-frequency basis.

[0551] If a terminal supporting three transmit antennas reports its terminal capability for UE capability value reporting to the base station, the terminal may use one or at least one of the following combined methods.

[0552] [Method 3-1]

[0553] A terminal supporting three transmit antennas may report up to four values ​​to the base station when reporting its terminal capabilities for UE capability value reporting, and each reported value must be a different value selected from {1, 2, 3}. For example, a terminal may report three values, 1, 2, and 3, to the base station, and the base station may expect the terminal to report one of the three values ​​using two bits when reporting capabilityIndex. At this time, the value 3 reported by the terminal may mean that the maximum number of SRS ports is 3, and this may be applied to all cases where a terminal supporting 3 transmission antennas uses a method of not transmitting 1 of the antenna ports of an SRS resource configured with 4 antenna ports as in the above [Method 1-1], or uses an SRS resource configured with 1 antenna port and an SRS resource configured with 2 antenna ports together as in the above [Method 1-2], or uses an SRS resource configured with 3 antenna ports as in the above [Method 1-3] and [Method 1-4], or may be applied in response to only one of the above [Methods 1-1] to [Methods 1-4] or a combination of at least one or more thereof.

[0554] [Method 3-2]

[0555] When a terminal supporting three transmit antennas reports its terminal capability for UE capability value reporting to a base station, it can report up to four values ​​to the base station, and each reported value must be selected as a different value among {1, 2, 4}. For example, the terminal can report three values ​​of 1, 2, and 4 to the base station, and the base station can expect the terminal to report one of the three values ​​using two bits when reporting capabilityIndex. In this case, the value 4 reported by the terminal may mean that the maximum number of SRS ports is 3. That is, even if the terminal reports 4, the base station may regard the reported value 4 as 3 for a terminal supporting three transmit antennas. This interpretation may be particularly appropriate when a terminal supporting three transmit antennas uses a method of not transmitting on one of the antenna ports of an SRS resource consisting of four antenna ports, as in [Method 1-1] above.

[0556] Additionally, a terminal supporting four transmit antennas may report up to four values ​​to the base station when reporting the terminal capability for UE capability value reporting to the base station, and each reported value may be selected from a different value among {1, 2, 3, 4}. For example, the terminal may report four values ​​of 1, 2, 3, and 4 to the base station, and the base station may expect the terminal to report one of the four values ​​using two bits when reporting capabilityIndex. In this case, the value 4 reported by the terminal may mean that the maximum number of SRS ports is 4, and the value 3 reported by the terminal may mean that the maximum number of SRS ports is 3.

[0557] Additionally, when a terminal supporting four transmit antennas reports its terminal capability for UE capability value reporting to the base station, it can report up to four values ​​to the base station, and each reported value is selected as a different value among {1, 2, 4}, and in the case of 4, it can be reported up to twice. For example, the terminal can report four values ​​of 1, 2, 4, 4 to the base station, and the base station can expect that the terminal reports one of the four values ​​using 2 bits when reporting capabilityIndex. In this case, the meaning of the value 4 mapped to an earlier code point among the values ​​4 reported by the terminal may mean that the maximum number of SRS ports is 3, and the meaning of the value 4 mapped to a later code point among the values ​​4 reported by the terminal may mean that the maximum number of SRS ports is 4.

[0558] Additionally, a terminal supporting 4 transmit antennas may report up to 4 values ​​to the base station when reporting the terminal capability for UE capability value reporting to the base station, and each reported value may be selected from {1, 2, 4} as a different value. For example, the terminal may report 3 values ​​of 1, 2, and 4 to the base station, and the base station may expect the terminal to report 1 of the 3 values ​​using 2 bits when reporting capabilityIndex. In this case, the value 4 reported by the terminal may mean that the maximum number of SRS ports is 4. In other words, a terminal supporting 4 transmit antennas may not support the value 3 when reporting the terminal capability for UE capability value reporting, which may mean that it does not perform SRS transmission represented by 3 antenna ports.

[0559] If the terminal has up to 8 transmit antennas, in addition to 1, 2, 3, and 4 described above, one or at least one combination of 5, 6, 7, and 8 can also be reported when reporting UE capability values. If the number of candidate values ​​exceeds 4, the capabilityIndex value reported by the terminal can be expressed with 3 bits.

[0560] The terminal may be notified by the base station of one or a combination of the above [Method 3-1] and [Method 3-2] through one or a combination of the above [Method 3-1] and [Method 3-2], or may expect that one or a combination of the above [Method 3-1] and [Method 3-2] is fixedly defined in the standard. Additionally, if the terminal is notified by the base station of a combination of specific one or more methods through one or a combination of the above [Method 3-1] and [Method 3-2], it may mean that the terminal cannot support one or more other combinations of the above specific methods. For example, the terminal may expect that the above [Method 3-1] is fixedly defined in the standard, and the terminal may assume that the above [Method 3-1] is used for UE capability value reporting. As another example, the terminal may be notified from the base station about the above [Method 3-2] through one or a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the terminal may consider that it has been notified by the base station that the above [Method 3-1] is not supported.

[0561] The terminal may report to the base station as to whether it can support one or at least one combination of [Method 3-1] and [Method 3-2] as described above. In this case, if the terminal reports to the base station as to whether it can support a combination of one or more specific methods, it may be regarded as reporting that the terminal cannot support one or more other combinations of methods. For example, the terminal may report to the base station as to whether it can support [Method 3-1] as described above. As another example, the terminal may report to the base station as to whether it can support [Method 3-2] as described above, and this terminal capability report may mean that the terminal cannot support [Method 3-1].

[0562] <Example 4: Available output by terminal structure during uplink multi-antenna transmission>

[0563] Below, we list various scenarios that can be considered when a terminal transmits an uplink channel using three power amplifiers and antennas in a specific frequency band, and based on these, we distinguish between scenarios in which the terminal can achieve maximum uplink output with the existing terminal power class (UE Power Class) and those in which it cannot, and we specifically explain methods for improving the impossible scenarios.

[0564] The transmission power that a terminal supporting FR1 can have during uplink transmission in a specific frequency band is managed by the output class of the terminal, and the power classes are defined as Power Class 3 (23 dBm), Power Class 2 (26 dBm), and Power Class 1.5 (29 dBm) based on general handheld UEs such as smartphones. Here, terminals supporting Power Class 3 and Power Class 2 are basically assumed to be based on the output from a single power amplifier (PA), whereas Power Class 1.5 (and in some cases, Power Class 2) is defined based on the sum of the outputs generated from two PAs for Power Class 2 (26 dBm), each connected to one antenna. In addition, Power Class 1 (31dBm), which supports higher output than this, is defined to be operated in the band supporting public safety nets, limited to vehicles and ships that can be handled by experts engaged in special occupations or jobs, rather than general ground-type terminals such as public safety net support terminals.

[0565] When a terminal performs uplink transmission using three power amplifiers and antennas based on a non-coherent UL codebook in a specific frequency band, the total power level that the terminal can transmit can be estimated according to three examples according to the power amplifier and antenna structures, as shown in FIG. 11.

[0566] FIG. 11 is an example of a terminal performing uplink transmission using three power amplifiers and antennas according to one embodiment of the present disclosure.

[0567] - [Example 1-1] In case of three power amplifiers and antennas supporting power class 3 (23dBm) (1101): If three identical power amplifiers supporting power class 3 (23dBm) can simultaneously support a specific frequency band, assuming an asynchronous uplink codebook, the uplink power can be 23dBm (200mW), which is the output of one power amplifier, in case of one-port transmission, and 26dBm (400mW), which is twice 23dBm (200mW), in case of two-port transmission (1102), depending on the number of antenna ports actually transmitting. Finally, assuming that all three-port antennas are used, the terminal can transmit an uplink signal at 27.8dBm (600mW), which is three times 23dBm (1103).

[0568] In the case of this example and the scenario of Fig. 11, it is possible to support 1-port or 2-port transmission with the previously defined power classes 3 and 2, respectively, but since there is no class that supports 3-port transmission, the terminal must transmit an uplink signal by forcibly lowering the power class to 2 when performing 3-port transmission.

[0569] - [Example 1-2] Case of two power amplifiers and antennas supporting power class 3 (23 dBm) and one power amplifier and antenna supporting power class 2 (26 dBm) (1104): As another example of uplink transmission with three power amplifiers and antennas in a specific band, it can be assumed that a power amplifier supporting power class 2 (26 dBm, 400 mW) is connected to one antenna port, and two identical power amplifiers supporting power class 3 (23 dBm, 200 mW) are each connected to one antenna port. In this case, assuming an asynchronous uplink codebook, depending on the number of antenna ports actually transmitting, the uplink power can be 23 dBm (200 mW) or 26 dBm (400 mW), which is the output of one power amplifier, for 1-port transmission, and 26 dBm (400 mW), which is twice 23 dBm (200 mW), (1105), or 27.8 dBm (600 mW) (1106), which is a combination of 23 dBm and 26 dBm, for 2-port transmission. Finally, assuming that all 3-port antennas are used, it is possible for the terminal to transmit an uplink signal at 29 dBm (800 mW) (1107).

[0570] Similarly, in the scenario of this example, even if the terminal is capable of 27.8 dBm (600 mW) in 2-port transmission, there is a disadvantage that the terminal must perform uplink transmission by forcibly lowering the level to power class 2 because there is no power class that supports it. In addition, in the case of 3-port transmission, new requirements need to be defined for transmitting power class 1.5 through 3 ports. (For example, the existing power class 1.5 assumes 2-port transmission and defines the corresponding power class requirements for each.)

[0571] - [Example 1-3] Case where there is one power amplifier and antenna supporting power class 3 (23 dBm) and two power amplifiers and antennas supporting power class 2 (26 dBm) (1108): As another example, it can be assumed that two power amplifiers supporting one power class 2 (26 dBm, 400 mW) are each connected to one antenna port, and additionally, one power amplifier supporting power class 3 (23 dBm, 200 mW) is connected to one antenna port. In this case, assuming an asynchronous uplink codebook, depending on the number of antenna ports actually transmitting, the uplink power can be 23 dBm (200 mW) or 26 dBm (400 mW), which is the output of one power amplifier, for 1-port transmission, or 29 dBm (800 mW) (1109), which is twice 26 dBm (400 mW), or 27.8 dBm (600 mW) (1110), which is a combination of 23 dBm and 26 dBm, for 2-port transmission. Finally, assuming that all 3-port antennas are used, the terminal can transmit an uplink signal at 30 dBm (1000 mW) (1111).

[0572] Likewise, in the scenario of this example, even if the terminal is capable of 27.8 dBm (600 mW) in 2-port transmission, the terminal has the disadvantage of being forced to perform uplink transmission at power class 2, and even if the terminal is capable of 30 dBm (1000 dBm) uplink output in 3-port transmission, the terminal has the disadvantage of having no choice but to transmit the uplink signal by reusing power class 1.5.

[0573] - [Example 1-4] Case of three power amplifiers and antennas supporting power class 2 (26 dBm) (1112): Finally, we can assume a structure in which all three power amplifiers and antenna ports support power class 2 (26 dBm, 400 mW), and each power amplifier is connected to one antenna port. In this case, assuming an asynchronous uplink codebook, depending on the number of antenna ports actually transmitting, the uplink power can be 26 dBm (400 mW), which is the output of one power amplifier, in case of 1-port transmission, and 29 dBm (800 mW), which is twice 26 dBm (400 mW), in case of 2-port transmission (1113). Finally, assuming the use of all three antennas, the terminal can transmit an uplink signal at 31 dBm (1200 mW) (1114), but new requirements need to be defined for transmitting power class 1 from a general-purpose terminal to a three-port terminal. (For example, the existing power class 1 requirement is limited to dedicated terminals supporting public safety networks.)

[0574] In summary, the output level at which a terminal can perform uplink transmission using three power amplifiers and antenna ports in a specific frequency band can be, as seen in the example above, a total of six cases, including 23 dBm, 26 dBm, 27.8 dBm, 29 dBm, 30 dBm, and 31 dBm, depending on the structure of the terminal and the number of transmitting antenna ports.

[0575] However, the maximum rated uplink power (hereinafter referred to as P) that the terminal can set and report to the base station CMAX) is determined by [Mathematical Formula 6], so it can be said that the actual transmitted output level of the terminal depends on the terminal power class (UE Power Class). In this case, in the case of 27.8 dBm (600 mW) or 30 dBm (1000 mW), which is not included in the power class that the terminal can report, transmission must be forcibly downgraded to a lower level of power class. For example, in the case of 27.8 dBm, transmission can be performed by downgrading to power class 3 (23 dBm) or power class 2 (26 dBm), and in the case of 30 dBm, transmission can be performed by downgrading to power class 1.5 (29 dBm), power class 2 (26 dBm), or power class 3 (23 dBm).

[0576] Even if the terminal can use a total of three power amplifier and antenna ports, from the uplink output perspective, it is the same as transmitting using the existing two power amplifiers and antennas. Therefore, even if the terminal adds power amplifiers and antennas, it cannot be expected to achieve a sufficient performance improvement.

[0577] <Example 5: Method for defining maximum power based on total available power during uplink multi-antenna transmission>

[0578] Below, when a terminal transmits an uplink using three power amplifiers and antennas in a specific band, the maximum rated output (hereinafter referred to as P) of the terminal supporting the function CMAX ) is specifically described in terms of the methods for defining the terminal based on the total output actually available.

[0579] As previously mentioned, the existing P CMAX P is an indicator based on the power rating for each band available to the terminal, as in [Mathematical Formula 5] and [Mathematical Formula 6]. PowerClass and △P PowerClass Based on P CMAX The upper and lower limits are derived, and among these, P PowerClassfollows the power class of the pre-defined terminal. Therefore, even if the terminal performs uplink transmission through multiple power amplifiers and antennas, if the output levels of each power amplifier are different, for example, if uplink transmission is supported with a power amplifier supporting 23 dBm and a power amplifier supporting 26 dBm, the sum of the output levels of the signals transmitted from the two antennas is different from the value indicated by the power class, and thus the P is assigned to the power class with the lower output. PowerClass When is set, the terminal transmits the total output level to multiple power amplifiers and antennas. CMAX There is a disadvantage that it may not be sufficiently reflected in the uplink output. In other words, even if a power amplifier and antenna are added to support the uplink output, no corresponding performance improvement can be expected.

[0580] As a way to solve this problem, the terminal introduces a new terminal capability, so that if the terminal supports a specific band using three power amplifiers and antennas, P CMAX P based on existing power ratings when deriving PowerClass One could consider a method where the indicator is replaced with the total output value that the terminal can actually support with multiple antennas. In this case, P PowerClass The following is a method to set up: For example, considering the structure that the terminal can implement, if the terminal reports a new terminal capability that supports uplink transmission using three antennas (e.g., [higherPowerLimit-3Tx]), the P can be set based on the total power value that can be transmitted by the three antennas. PowerClass By setting up a new power amplifier level (or power rating) to support three antennas, or by specifying the power amplifier level (or power rating) added to support three antennas, we derive the linear summation possible with three antennas, P PowerClass The indicator can be set anew. That is, the terminal and base station can set the maximum P that can be transmitted from the terminal. CMAXTo determine the P transmitted to the existing two power amplifiers and antennas PowerClass One or more of the various methods based on the value, or at least one combination thereof, is transmitted to three power amplifiers and antennas. PowerClass You may consider replacing it with a value.

[0581] [Method 5-1] Method based on summation of antenna output (power rating):

[0582] Figure 12 shows the terminal capability using the terminal to indicate the total combined power. CMAX This is a diagram illustrating an example of the process of setting a value. As described above, when transmitting an uplink signal using three power amplifiers and antennas as in Fig. 12, if the terminal uses a terminal capability (e.g., [higherPowerLimit-3Tx]) that indicates a total sum power different from the existing power class, the P set based on the actual sum power is set. CMAX The value can be reported to the base station, and when the terminal capability is reported, the P based on the terminal grade for each existing band PowerClass Not a new P PowerClass Replace with P CMAX can be derived.

[0583] For example, it is determined whether the terminal reports a new terminal capability (e.g., [higherPowerLimit-3Tx]) (1201). If so, the terminal can report a new combined power of 27.8 dBm or 30 dBm in addition to the existing power class by setting it to 0 or 1, respectively. Therefore, if it is set to 0 (in the case of 27.8 dBm), the new P that can be applied when transmitting an uplink signal with three antennas PowerClass can be set to 27.8dBm (1202), and conversely, if it is set to 1, a new P that can be applied when transmitting uplink signals with three antennas PowerClasscan be set to 30dBm (1203). At this time, the base station may be aware of which power amplifier the terminal uses to transmit using three antennas and what the maximum output of each power amplifier is based on the terminal capability report. That is, if the output of the terminal using three antennas in a specific band is different from the existing power class, and the terminal reports the terminal capability to the base station as 0 or 1, the base station will determine that the terminal uses three antennas and the total available power is 27.8dBm or 30dBm. PowerClass is set and the terminal is P CMAX It can calculate the value (1204) and recognize that an uplink signal is being transmitted.

[0584] In this way, even if the sum of the three antenna outputs is not included in the existing power rating, P CMAX It can be used for derivation and based on low power class (e.g., the sum output is 27.8 dBm, but adjusted to 26 dBm based on power class 2) P PowerClass The value is not set, and P is based on the actual sum output. PowerClass and P CMAX Since it can be set, an artificial P according to the limitations of the specification CMAX Value adjustment can be avoided, and from the perspective of the uplink output of the terminal, performance improvements such as uplink coverage due to three antenna transmission can be expected compared to the existing two-antenna transmission. In other words, if the terminal is capable of outputting using three antennas in a specific band, and reports the terminal capability to the base station, the base station can calculate the P based on the combined power of the terminal using three antennas. CMAX It is possible to recognize that a value can be transmitted.

[0585] (1201) If the terminal does not perform the terminal capability report in step 1201 or if the terminal capability report includes information that it follows the existing power class, the terminal may follow the existing power class (1205). The terminal may follow the P according to the existing power class. PowerClass Set P CMAX can be calculated (1204), and the calculated P CMAX Uplink signals can be transmitted using the base station. The terminal can also transmit P according to the existing power rating. PowerClass Set P CMAX It can be recognized that an uplink signal is being transmitted by calculating .

[0586] The values ​​described above are merely examples, and it is entirely possible that other values ​​could be applied. The flowcharts described above illustrate exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0587] [Method 5-2] Method based on added output values:

[0588] Figure 13 shows the terminal capability using the terminal to indicate additional power. CMAX This is a diagram illustrating an example of the process of setting a value. In another way, as shown in Fig. 13, if the terminal supports three antennas and reports a terminal capability (e.g., [higherPowerLimit-3Tx]) indicating a total sum power different from the existing power class, the terminal and the base station set an additional output value based on the bit value of the corresponding terminal capability, and add it to the existing power class to create a new P PowerClass and P CMAX You can set or report values.

[0589] For example, in a band where uplink transmission is possible with power class 2, it can be determined whether the terminal reports a new terminal capability supporting three antennas (1301). Since the output value of one additional power amplifier and uplink transmission antenna in the band can be 23 dBm or 26 dBm, the terminal can report this by setting it to 0 or 1 when reporting the terminal capability. Therefore, if the terminal sets the output value of the additional power amplifier to 0 (in the case of 23 dBm), a new parameter (e.g., [P 3Tx ]) value is 23dBm (1302), and the terminal is P CMAX When deriving, the existing P PowerClass In [P 3Tx ] can be based on the linear sum of the output values ​​of the other two power amplifiers (1303). At this time, the base station may be aware of the output values ​​of the other two power amplifiers in advance. That is, the terminal may generate P based on the linear sum of the output values ​​of the other two power amplifiers and the output value of the additional power amplifier. CMAX can be determined. Conversely, if the output value of the power amplifier to which the terminal is added is set to 1, a new parameter (e.g., [P 3Tx ]) value is 26dBm (1303), and the terminal is P CMAX When deriving, the existing P PowerClass In [P 3Tx ] can be based on the linear sum of the outputs of the other two power amplifiers and the output of the additional power amplifier (1304). That is, the terminal P is based on the linear sum of the outputs of the other two power amplifiers and the output of the additional power amplifier. CMAXcan be determined. That is, if the terminal is capable of outputting using three antennas in a specific band, and the terminal reports the terminal capability to the base station as 0 or 1, the base station determines that the terminal uses three antennas and P based on the summed power added by 23 dBm or 26 dBm from the existing power class. CMAX It can be recognized that a value is being set and transmitted.

[0590] The terminal does not report terminal capabilities, or [P 3Tx ] is reported as 0 dBm, the terminal may follow the existing power rating based on the output values ​​of the other two power amplifiers (1305). The terminal may follow the existing power rating according to the P PowerClass Set P CMAX can be calculated (1304), and the calculated P CMAX Uplink signals can be transmitted using the base station. The terminal can also transmit P according to the existing power rating. PowerClass Set P CMAX It can be recognized that an uplink signal is being transmitted by calculating .

[0591] The values ​​described above are merely examples, and it is entirely possible that other values ​​could be applied. The flowcharts described above illustrate exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, the various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0592] [Method 5-3] How to add a new power rating

[0593] There may be a way to define new power classes that support 27.8dBm and 30dBm so that terminals can use 27.8dBm or 30dBm as the new power classes. For example, in addition to the existing power classes defined in 3dB units from 23dBm (200mW) to 29dBm (800mW) based on a conventional terminal, new power classes such as 27.8dBm (600mW) and 30dBm (1000mW), which are the total power levels that can actually be implemented, are added, so that the terminal reports its terminal capability to the base station based on the power class in 200mW units and P based on the new power class. PowerClass Set P CMAX This is a method that allows calculation. At this time, 27.8 dBm can be named as a power class between power classes 2 and 1.5 (e.g., [power class 1.7]), and 30 dBm can be named as a power class between power classes 1.5 and 1 (e.g., [power class 1.2]). That is, in the case of the method of adding these new power classes, P CMAX P when deriving PowerClass Without changing the way the P is set, the terminal will be set to P based on the newly defined power class. PowerClass can be set, and this can be applied not only to three-antenna transmission, but also to all cases where the terminal performs uplink transmission using multiple antennas. For example, the same principle can be applied even when the number of antennas is 4 or more.

[0594] The terminal may report to the base station as to whether it can support one or at least one combination of [Method 5-1] to [Method 5-3] as a terminal capability. In this case, if the terminal reports to the base station as a terminal capability that a combination of one or more specific methods can be supported, it may be regarded as the terminal reporting that it cannot support one or more other combinations of methods. For example, the terminal may report to the base station as to whether it can support [Method 5-1] as a terminal. As another example, the terminal may report to the base station as to whether it can support [Method 5-3] as a terminal capability, and this terminal capability report may mean that the terminal cannot support [Method 5-1].

[0595] <Embodiment 6: Maximum power control method based on available total output during uplink multi-antenna transmission>

[0596] Below, the terminal performs uplink transmission using three power amplifiers and antennas in a specific band. CMAX The definition methods are described in detail. When a terminal transmits uplink using multiple antennas, P is determined based on the sum of the actual available power. CMAX To derive, among the methods mentioned above, a new terminal capability (e.g., [higherPowerLimit-3Tx]) is reported to the base station, and P PowerClass A representative method based on the summation of each antenna output (power rating) can be utilized. That is, the terminal reports the terminal capability to the base station, and the total output value summed from the three antennas is P PowerClass Substitute into P CMAX , and the base station determines that the terminal uses three antennas and P based on the combined power. CMAXThis is a method to enable the terminal to recognize that it can transmit a value. The following is written based on [Method 5-1] as described above, but the terminal can transmit P based on at least one combination of [Method 5-1] to [Method 5-3]. PowerClass and P CMAX can be obtained, and even if it is not [Method 5-1] or [Method 5-3], the terminal can obtain a new P PowerClass If you decide to do so, it is possible to apply the following methods.

[0597] In the above [Equation 5] and [Equation 6], P EMAX,c is the base station setting p-Max IE defined in TS 38.331, or a value based on local regulations, such as the value of an additional additionalPmax field in the network signaling NR-NS-PmaxList IE.

[0598] In the above [Equation 5] and [Equation 6], P Powerclass is the maximum UE power value defined as an example in [Table 38]. However, if the terminal supports [higherPowerLimit-3Tx], the PPowerClass value is set to 27.8 dBm or 30 dBm depending on the reported terminal capability.

[0599] Similarly, as mentioned in the fifth embodiment, the terminal may consider various methods other than the antenna output (power rating) summation-based method to determine the P CMAX The terminal power rating table can be updated in uplink transmission considering multiple antennas or determining the power rating. Based on the methods introduced in the fifth embodiment, the possible scenarios are summarized as follows. [Table 44] adds the terminal capability to support three power amplifiers and antenna transmission, and P based on the added power level according to the capability. PowerClass This describes the case where .

[0600] [Table 44]

[0601]

[0602] On the other hand, adding a new power class allows the terminal to use P based on the total available output. CMAX In the method of deriving the existing P PowerClass The definition will be maintained, and new power classes will be added to the band-specific power class table of terminals, as shown in [Table 45]. [Table 45] shows, for example, the bands that support uplink MIMO and their power classes by band. The added power classes can be extended and used in power classes other than uplink MIMO. Table 45 may also show the power classes of terminals that support uplink MIMO in closed-loop spatial multiplexing techniques.

[0603] [Table 45]

[0604]

[0605]

[0606] As shown in [Table 45], when a new power class is added to the power classes of a terminal supporting uplink MIMO in a closed-loop spatial multiplexing technique, as mentioned in the previous embodiment, in a band that previously supported power class 2 (26 dBm) using up to two power amplifiers and antennas, a new power class 1.7 (27.8 dBm) can be added when uplink transmission is performed using three power amplifiers and antennas. In addition, for similar reasons, in a band that previously supported power class 1.5 (29 dBm) using up to two power amplifiers and antennas, a new power class 1.2 (30 dBm) can be added when uplink transmission is performed using three power amplifiers and antennas. However, for the new power classes, an explanation that they are uplink transmissions using three power amplifiers, three antenna ports, or three layers must be added, as in NOTE 3 in [Table 45].

[0607] <Example 7: Method of utilizing uplink multiple antennas for each carrier when combining carriers within a band>

[0608] As one embodiment of the present disclosure, a method of utilizing uplink multiple antennas for each carrier when combining uplink carriers within a specific band is described. As described above, a terminal may be equipped with three power amplifiers and three transmit antennas, and these three power amplifiers and three transmit antennas may be taken into consideration when transmitting an uplink channel.

[0609] - In addition, the terminal can support uplink carrier aggregation within any band and receive higher layer signaling related thereto from the base station.

[0610] - When combining uplink carriers within a band, the terminal can be used in common for different uplink carriers within the same band, as long as the maximum transmission power of the power amplifier connected to a specific transmission antenna is permitted.

[0611] - When a terminal supports uplink carrier aggregation within a band, the base station may not be able to set up appropriate upper layer signaling for uplink transmission for each carrier without information about which combination of antennas the terminal will support for each carrier within the band, the maximum transmittable power for each antenna based on the combination of the available antennas for each carrier, or the maximum transmittable power considering all available antennas for each carrier.

[0612] - Therefore, the terminal can report additional information to the base station when combining carriers within the band, so that the base station can transmit appropriate upper layer signaling and scheduling information.

[0613] FIG. 14 is a diagram illustrating power constraints for each power amplifier for each carrier according to the number of antennas for each carrier when combining carriers within a band according to one embodiment of the present disclosure.

[0614] The terminal can be equipped with three power amplifiers and three antennas corresponding to each power amplifier (1410, 1411, 1412). The terminal can receive two carriers (CC#1 (1401, 1431, 1461), CC#2 (1402, 1432, 1462), CC: component carrier) within a specific band from the base station using a carrier aggregation method. Considering the carrier aggregation within the band, the maximum available power value of a specific power amplifier in a specific CC is P c,p can be defined as (1408), where p can mean the index of the power amplifier (since we consider three power amplifiers, p can have one of the values ​​1, 2, or 3), and c can mean the index of the CC (since we consider two CCs, c can have one of the values ​​1 or 2).

[0615] - The terminal can use all power amplifiers and transmit antennas among three power amplifiers and three transmit antennas in CC#1, and can use one power amplifier and transmit antenna among them in CC#2 (1400). At this time, since one power amplifier and transmit antenna among three power amplifiers and transmit antennas are used in both CCs, the terminal may be required to use the corresponding one power amplifier and transmit antenna so that the sum of the powers allocated to each of the two CCs does not exceed the maximum output of the corresponding power amplifier (1405). In addition, the terminal may be required to use the terminal so that the total output of all power amplifiers used in all CCs does not exceed the power rating of the terminal (1407).

[0616] - The terminal can use all power amplifiers and transmit antennas among the three power amplifiers and three transmit antennas in CC#1, and can use two power amplifiers and transmit antennas among them in CC#2 (1430). At this time, since two power amplifiers and transmit antennas among the three power amplifiers and transmit antennas are used in both CCs, the terminal may be required to use the corresponding two power amplifiers and transmit antennas so that the sum of the powers allocated to each of the two CCs does not exceed the maximum output of the corresponding power amplifiers (1405). In addition, the terminal may be required to use the terminal so that the total output of all power amplifiers used in all CCs does not exceed the power rating of the terminal (1407).

[0617] - The terminal can use all power amplifiers and transmit antennas among the three power amplifiers and three transmit antennas in both CC#1 and CC#2 (1460). At this time, since the terminal uses three power amplifiers and transmit antennas among the three power amplifiers and transmit antennas in both CCs, the terminal may be required to use the powers allocated to the two CCs for the corresponding three power amplifiers and transmit antennas so that the total output of the corresponding power amplifiers does not exceed the maximum output of the corresponding power amplifiers (1405). In addition, the terminal may be required to use the powers so that the total output of all power amplifiers used in all CCs does not exceed the power rating of the terminal (1407).

[0618] The terminal may consider one or at least one combination of the following methods for how the terminal can allocate power to the three power amplifiers and the two carriers, taking into account the maximum output value of each power amplifier.

[0619] [Power Allocation Method 7-1]

[0620] When combining uplink carriers within a band, the terminal can be restricted to have the same maximum transmit power for each power amplifier for each CC. That is, the terminal can have the same P for each power amplifier for each CC. c,p It can be expected that the terminal will have different maximum available powers for each power amplifier across all CCs. Furthermore, the terminal can expect the sum of the maximum available powers of all power amplifiers assigned to each CC to be different.

[0621] For example, if the maximum output of each of three power amplifiers is 23 dBm, and the terminal is in power class 3, which means that the maximum output considering all CCs and all power amplifiers is 23 dBm, if three power amplifiers and transmit antennas are assigned to CC#1 and one power amplifier and transmit antenna are assigned to CC#2, the terminal will have the same P for each power amplifier for each CC. c,p To have a value for each P c,p can be constrained to have a maximum output of 17 dBm. In this case, if the first power amplifier and transmit antenna are used in both CC#1 and CC#2, the power amplifier can be used up to 20 dBm across both CCs, and the other power amplifier and transmit antenna are used in only one CC across both CCs, so they can be used up to 17 dBm. In addition, in CC#1, 21.77 dBm is used across all power amplifiers and transmit antennas, while in CC#2, only the first power amplifier and transmit antenna are used, so 17 dBm can be used across all power amplifiers and transmit antennas. If the power amplifiers for each CC can have a maximum output of 17 dBm, the terminal can have a maximum output of 23 dBm across all CCs and all power amplifiers, which can correspond to the power class 3 described above.

[0622] When using this power allocation method, the terminal can have the same maximum transmit power for each power amplifier within each CC, so it can be expected that the maximum output of the signal transmitted through each transmit antenna is equally constrained. This can ensure that when the terminal receives a scheduling from the base station to transmit an uplink channel using an antenna selection type precoder, it can have the same maximum transmit power for each transmit antenna. In addition, even when transmitting more than one layer, the terminal can have the same maximum transmit power for each power amplifier within each CC, so it can have the same maximum transmit power for each layer. However, the transmit power for each CC across all power amplifiers may be different, and therefore, there may be a possibility that the uplink coverage for each CC may be different.

[0623] [Power Allocation Method 7-2]

[0624] When aggregating uplink carriers within a band, the terminal can restrict each power amplifier across all CCs to have the same maximum transmit power. In this case, the terminal can have different maximum available powers for each power amplifier within each CC. Furthermore, the terminal can expect the sum of the maximum available powers of all power amplifiers assigned to each CC to be different.

[0625] For example, if the maximum output of each of three power amplifiers is 23 dBm, and the terminal is in power class 3, which means that the maximum output considering all CCs and all power amplifiers is 23 dBm, and if three power amplifiers and transmit antennas are assigned to CC#1 and one power amplifier and transmit antenna are assigned to CC#2, in order for the terminal to have the same maximum output value for each power amplifier across all CCs, each power amplifier can be constrained to have 18.23 dBm. In this case, if the first power amplifier and transmit antenna are used in both CC#1 and CC#2, the first power amplifier and transmit antenna can be used for each CC up to 15.22 dBm, and the other power amplifier and transmit antenna can be used for only one CC across the two CCs, so they can be used up to 18.23 dBm. Also, in CC#1, 22.21 dBm is used across all power amplifiers and transmit antennas, whereas in CC#2, only the first power amplifier and transmit antenna are used, so 15.22 dBm can be used across all power amplifiers and transmit antennas. If each power amplifier across all CCs can have a maximum output of 18.23 dBm, the terminal can have a maximum output of 23 dBm across all CCs and all power amplifiers, which can correspond to the power class 3 described above.

[0626] When using this power allocation method, since the terminal can have the same maximum transmit power for each power amplifier across all CCs, it can be expected that the maximum output of the signal transmitted to each transmit antenna within a specific band is equally constrained. This can be constrained to a situation where the same electromagnetic wave leaks regardless of which power amplifier the terminal uses within a specific band, so it can be satisfied even if any power amplifier is used when considering the regulation within a specific band. However, if each power amplifier has a different maximum output value, there may be cases where the maximum output of the power amplifier cannot be utilized because each power amplifier must have the same maximum available power across all CCs.

[0627] [Power Allocation Method 7-3]

[0628] When aggregating uplink carriers within a band, the terminal can restrict all power amplifiers to have the same maximum transmit power for each CC. In this case, the terminal can have different maximum available powers for each power amplifier within each CC. Furthermore, the terminal can expect the sum of the maximum available powers of each power amplifier across all CCs to be different.

[0629] For example, if the maximum output power of each of three power amplifiers is 23 dBm, and the terminal is in power class 3, which means that the maximum output power considering all CCs and all power amplifiers is 23 dBm, if three power amplifiers and transmit antennas are assigned to CC#1 and one power amplifier and transmit antenna are assigned to CC#2, the terminal can be constrained to have 20 dBm for each CC in order to have the same maximum output power value for each CC across all power amplifiers. In this case, if the first power amplifier and transmit antenna are used in both CC#1 and CC#2, the first power amplifier and transmit antenna can be used for CC#1 up to 15.22 dBm and for CC#2 up to 20 dBm. The other power amplifiers and transmit antennas can be used for only one CC across the two CCs, so they can be used for up to 15.22 dBm. Additionally, 20 dBm can be used across all power amplifiers and transmit antennas in both CC#1 and CC#2. If all power amplifiers can achieve a maximum output of 20 dBm across each CC, the terminal can achieve a maximum output of 23 dBm across all CCs and all power amplifiers, which corresponds to the aforementioned Power Class 3.

[0630] When using this power allocation method, the terminal can have the same maximum transmit power for each CC across all power amplifiers, so it can have similar coverage for each CC within a specific band, and it can be restricted to a situation where similar electromagnetic waves leak from each other, so it can be satisfied even if an arbitrary power amplifier is used when considering regulations within a specific band. However, since each power amplifier can have different maximum output values ​​within each CC, this can lead to a situation where the maximum transmit power is different depending on which precoder is indicated when using an antenna selection-based precoder.

[0631] The terminal may consider the number of transmit antennas that can be allocated to each carrier and the maximum available power for each transmit antenna at that time by considering three power amplifiers and transmit antennas when combining carriers, taking into account one or a combination of at least one of the above-described [Power Allocation Method 7-1], [Power Allocation Method 7-2], and [Power Allocation Method 7-3], and may report to the base station which power allocation method was used, or may assume that it is fixedly defined in the standard.

[0632] If a terminal supports three power amplifiers and transmit antennas, the terminal can report as terminal capability the combination of the number of transmit antennas that can be assigned to each carrier considering uplink carrier aggregation within any band. For example, if a terminal can support two CCs through carrier aggregation within a specific band, the terminal can report as terminal capability how many transmit antennas are available on each of the two CCs, and in this case, the terminal capability report can report at least one of (3TX + 1TX), (3TX + 2TX), and (3TX + 3TX). In this case, if the terminal reports (3TX + 1TX), it may mean that the terminal can support three transmit antennas on CC#1 and one transmit antenna on CC#2. As another example, the terminal may report one or at least one combination of (3TX + 1TX), (3TX + 2TX), (3TX + 3TX), (2TX + 1TX), (2TX + 2TX), (1TX + 1TX) through the terminal capability report.

[0633] In addition to reporting the terminal capability for the combination of the number of antennas described above, the terminal may report the terminal capability for antenna correlation (or antenna coherency) in each CC to the base station. For example, in addition to the report (3TX + 1TX) above, the terminal may report that all three transmit antennas in a CC supporting three transmit antennas have antenna correlation (i.e., all three transmit antennas are fully coherent), some antennas have correlation (i.e., partial coherent, where some of the three antennas are coherent), or none of the antennas have correlation (i.e., all three antennas are non-coherent). Alternatively, the terminal may report information on antenna correlation along with the number of antennas that can be supported for each CC. For example, a terminal can report (3TX FC + 3TX PC), where 3TX FC can mean that it supports three transmit antennas, all of which support full coherent with antenna correlation, and 3TX PC can mean that it supports three transmit antennas, but some of which support partial coherent with antenna correlation. Alternatively, a terminal can report 3TX NC for a specific CC, where it can mean that it supports three transmit antennas, but none of which support non-coherent with antenna correlation.

[0634] In addition to the information related to the number of antennas and antenna correlation described above, the terminal can also report to the base station whether the transmit antennas used in each CC overlap with each other or should be allocated without overlapping with each other, considering the combination of transmit antennas used in each CC. For example, if the terminal supports (3TX PC + 3TX NC), this may mean that the terminal supports partial coherent in which some of the three transmit antennas have antenna correlation in CC#1, and supports non-coherent in which all of the three transmit antennas do not have antenna correlation in CC#2, and if the terminal transmits through two antennas through the partial coherent codebook in CC#1 and through one antenna through the non-coherent codebook in CC#2, the terminal may additionally report to the base station whether the two antennas and one antenna used in CC#1 and CC#2 overlap or are different antennas.

[0635] The above-described matters consider a maximum of two carriers when the terminal combines carriers within a band, but this is an example, and the above-described matters can be similarly applied to the combination of three or more carriers rather than two carriers.

[0636] Although the above-described matters have been written primarily considering three power amplifiers and three transmit antennas when the terminal combines carriers within the band, this is an example, and the above-described matters can be similarly applied to power amplifiers and transmit antennas corresponding to smaller or larger values ​​than three power amplifiers and three transmit antennas.

[0637] The above-described matters were written in consideration of the available power for each power amplifier for each carrier when the terminal combines carriers within a band, but this is an example, and the above-described matters can be similarly applied when combining carriers between bands.

[0638] FIG. 15 is a diagram illustrating the operation of a terminal according to one embodiment of the present disclosure.

[0639] In step 1500, the terminal may transmit terminal capabilities to the base station. The terminal capabilities that may be reported at this time may include an uplink transmission function of a terminal supporting three transmit antennas defined in the first to third embodiments, an SRS support method for codebook purposes for a terminal supporting three transmit antennas, an uplink codebook definition method, an SRS support method for non-codebook purposes, a terminal capability associated with the above [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2], a terminal capability associated with determining a power rating of a terminal considering three power amplifiers and transmit antennas considered in the fourth to sixth embodiments, and a terminal capability related to the number of available transmit antennas for each CC, antenna correlation, overlapping, etc. when combining carriers within a band considered in the seventh embodiment. Step 1500 may also be omitted.

[0640] In step 1505, the terminal may receive upper layer signaling from the base station according to the reported terminal capability. At this time, the terminal may be configured for one or a combination of at least one of the following: an SRS support method for codebook purposes for a terminal supporting three transmit antennas defined in the first to third embodiments, an uplink codebook definition method, an SRS support method for non-codebook purposes, and upper layer signaling associated with [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2], an upper layer signaling related to a power rating of the terminal considering three power amplifiers and transmit antennas considered in the fourth to sixth embodiments, and an upper layer signaling considering the number of available transmit antennas for each CC, antenna correlation, overlapping, etc. when combining carriers within a band considered in the seventh embodiment.

[0641] In step 1510, the terminal may transmit an uplink reference signal to the base station. At this time, the uplink reference signal may be an SRS. At this time, the terminal may transmit an SRS whose usage is set to codebook or noncodebook based on [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2] to the base station, including a method for supporting SRS for codebook purposes, an uplink codebook definition method, and a method for supporting SRS for non-codebook purposes for a terminal supporting three transmission antennas defined in the first to third embodiments.

[0642] In step 1515, the terminal may receive PUSCH transmission scheduling from the base station and perform PUSCH transmission based on the methods mentioned in the first to third embodiments (for example, one or a combination of at least one of [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2]), or receive PDSCH scheduling information from the base station that has acquired downlink channel information and downlink precoding information by receiving SRS for antenna switching and receive a PDSCH corresponding thereto, or report L1-RSRP or L1-SINR together with capabilityIndex based on the methods mentioned in the third embodiment (for example, one or a combination of at least one of [Method 3-1] and [Method 3-2]). Additionally, in a carrier aggregation situation within a band, the terminal can be notified of the transmission precoder for each CC, which has the same or different number of transmission antennas, from the base station, based on the number of antennas that the terminal can support, correlation, and overlapping for each CC, through DCI or higher layer signaling.

[0643] In step 1520, the terminal can perform PUSCH transmission to the base station based on the PUSCH scheduling information received in step 1515.

[0644] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0645] FIG. 16 is a diagram illustrating the operation of a base station according to one embodiment of the present disclosure.

[0646] In step 1600, the base station can receive terminal capabilities from the terminal. The terminal capabilities that can be reported at this time may include an uplink transmission function of a terminal supporting three transmit antennas defined in the first to third embodiments, an SRS support method for a codebook for a terminal supporting three transmit antennas, an uplink codebook definition method, a terminal capability associated with [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2], a terminal capability associated with determining a power rating of a terminal considering three power amplifiers and transmit antennas considered in the fourth to sixth embodiments, and a terminal capability related to the number of available transmit antennas for each CC, antenna correlation, overlapping, etc. when combining carriers within a band considered in the seventh embodiment. Step 1600 may also be omitted.

[0647] In step 1605, the base station may transmit upper layer signaling to the terminal according to the terminal capability reported by the terminal. At this time, the base station may set one or a combination of at least one of the following for the terminal: an SRS support method for codebook purposes for a terminal supporting three transmit antennas defined in the first to third embodiments, an uplink codebook definition method, an SRS support method for non-codebook purposes, an upper layer signaling associated with [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2], an upper layer signaling related to a power rating of the terminal considering three power amplifiers and transmit antennas considered in the fourth to sixth embodiments, and an upper layer signaling considering the number of available transmit antennas for each CC, antenna correlation, and overlapping when combining carriers within a band considered in the seventh embodiment.

[0648] In step 1610, the base station can receive an uplink reference signal from the terminal. At this time, the uplink reference signal can be an SRS. At this time, the base station can receive an SRS from the terminal based on a method in which usage is set to the terminal as a codebook or noncodebook based on [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2], including a method for supporting SRS for codebook purposes, an uplink codebook definition method, and a method for supporting SRS for non-codebook purposes for a terminal supporting three transmission antennas defined in the first to third embodiments.

[0649] In step 1615, the base station may transmit PUSCH transmission scheduling to the terminal and notify the terminal to perform PUSCH transmission based on the methods mentioned in the first to third embodiments (for example, one or a combination of at least one of the [Method 1-1] to [Method 1-4], [Method 3-1], and [Method 3-2]), or may receive SRS for antenna switching to obtain downlink channel information and downlink precoding information and transmit PDSCH scheduling information to the terminal and transmit a PDSCH corresponding thereto, or may receive information reported by the terminal together with capabilityIndex of L1-RSRP or L1-SINR based on the methods mentioned in the third embodiment (for example, one or a combination of at least one of the [Method 3-1] and [Method 3-2]). Additionally, the base station may notify the terminal of the transmission precoder according to the same or different number of transmission antennas for each CC through DCI or higher layer signaling, depending on the number of antennas, correlation, and overlapping possibility that the terminal can support for each CC in the carrier aggregation situation within the band of the terminal.

[0650] In step 1620, the base station can receive the PUSCH transmitted by the terminal based on the PUSCH scheduling information transmitted in step 1615.

[0651] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0652] [Terminal / Base Station Structure]

[0653] FIG. 17 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0654] Referring to FIG. 17, the terminal may include a transceiver, which refers to a terminal receiving unit (1700) and a terminal transmitting unit (1710), a memory (not shown), and a terminal processing unit (1705, or a terminal control unit or processor). Depending on the communication method of the terminal described above, the transceiver units (1700, 1710), the memory, and the terminal processing unit (1705) of the terminal may 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 components described above. In addition, the transceiver unit, the memory, and the processor may be implemented in the form of a single chip.

[0655] A transceiver unit can transmit and receive signals to and from a base station. The signals may include control information and data. To this end, the transceiver unit may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is merely one embodiment of the transceiver unit, and the components of the transceiver unit are not limited to the RF transmitter and RF receiver.

[0656] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit a signal output from the processor through the wireless channel.

[0657] Memory can store programs and data necessary for the terminal's operation. Furthermore, memory can store control information or data included in signals transmitted and received by the terminal. Memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0658] Additionally, the processor can control a series of processes to enable the terminal to operate according to the aforementioned embodiments. For example, the processor can receive DCI consisting of two layers and control components of the terminal to simultaneously receive multiple PDSCHs. There may be multiple processors, and the processors can perform component control operations of the terminal by executing programs stored in memory.

[0659] FIG. 18 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0660] Referring to FIG. 18, the base station may include a transceiver, which refers to a base station receiver (1800) and a base station transmitter (1810), a memory (not shown), and a base station processor (1805, or a base station control unit or processor). Depending on the communication method of the base station described above, the transceiver (1800, 1810), the memory, and the base station processor (1805) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. In addition, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0661] The transceiver can transmit and receive signals with the terminal. Here, the signals may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0662] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit the signal output from the processor through the wireless channel.

[0663] The memory can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0664] The processor can control a series of processes to enable the base station to operate according to the aforementioned embodiments of the present disclosure. For example, the processor can configure two layers of DCIs containing allocation information for multiple PDSCHs and control each component of the base station to transmit them. There may be multiple processors, and the processors can perform component control operations of the base station by executing programs stored in memory.

[0665] The methods according to the 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.

[0666] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The 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.

[0667] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0668] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present disclosure.

[0669] In the specific embodiments of the present disclosure described above, components included in the invention are expressed singularly or plurally, 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. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0670] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the above-mentioned embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment can be combined with each other to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been presented based on an FDD LTE system, other modifications based on the technical idea of ​​the above-mentioned embodiments can be implemented with other systems such as a TDD LTE system, a 5G or NR system.

[0671] Meanwhile, the order of description in the drawings explaining the method of the present invention does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0672] Alternatively, the drawings illustrating the method of the present invention may omit some components and include only some components within a scope that does not harm the essence of the present invention.

[0673] In addition, the method of the present invention may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the invention.

[0674] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

Claims

1. A method performed by a terminal supporting three transmission antennas in a wireless communication system, A step of transmitting terminal capability information including information indicating the maximum number of SRS (sounding reference signal) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; A step of receiving an upper layer configuration including an SRS resource having a set number of ports, wherein when the number of ports for the SRS resource is 4, one of the 4 ports is identified as unused; A step of transmitting an SRS for the SRS resource using a port identified based on the number of ports; A step of receiving scheduling information for uplink transmission; and A method comprising the step of performing the uplink transmission based on the received scheduling information.

2. In claim 1, A method wherein the above one port is the last port among the above four ports.

3. In claim 1, The above four ports include antenna port 1000, antenna port 1001, antenna port 1002, and antenna port 1003, The above one port is antenna port 1003, method.

4. In claim 1, A method wherein the above upper layer setting further includes information indicating that one of the four ports is not in use.

5. In claim 4, A method wherein identifying one of the four ports as unused comprises identifying one of the four ports as unused based on information indicating that the one of the four ports is unused.

6. In claim 1, A method wherein the terminal capability information further includes information indicating the maximum number of layers supported by the terminal, wherein the maximum number of layers includes 3.

7. In claim 1, The above upper layer setting includes an SRS resource set whose usage is set to codebook, A method wherein the above uplink transmission includes codebook-based uplink transmission.

8. A terminal supporting three transmission antennas in a wireless communication system, transceiver; and A processor comprising: Transmit terminal capability information including information indicating the maximum number of SRS (sounding reference signal) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; A higher layer configuration is received that includes an SRS resource with a set number of ports, and if the number of ports for the SRS resource is 4, one of the 4 ports is identified as unused; Transmitting an SRS for the SRS resource using a port identified based on the number of ports; Receive scheduling information for uplink transmission; and A terminal configured to perform the uplink transmission based on the received scheduling information.

9. A method performed by a base station in a wireless communication system, A step of receiving terminal capability information from a terminal, the terminal including information indicating the maximum number of SRS (sounding reference signal) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; A step of transmitting to the terminal an upper layer setting including an SRS resource having a set number of ports, wherein when the number of ports for the SRS resource is 4, one of the 4 ports is identified as unused; A step of receiving an SRS for the SRS resource from the terminal using a port identified based on the number of ports; A step of transmitting scheduling information for uplink transmission to the terminal; and A method comprising the step of receiving the uplink transmission from the terminal based on the scheduling information.

10. In claim 9, A method wherein the above one port is the last port among the above four ports.

11. In claim 9, The above four ports include antenna port 1000, antenna port 1001, antenna port 1002, and antenna port 1003, The above one port is antenna port 1003, method.

12. In claim 9, A method wherein the above upper layer setting further includes information indicating that one of the four ports is not in use.

13. In claim 12, A method wherein identifying one of the four ports as unused comprises identifying one of the four ports as unused based on information indicating that the one of the four ports is unused.

14. In claim 9, A method wherein the terminal capability information further includes information indicating the maximum number of layers supported by the terminal, wherein the maximum number of layers includes 3.

15. As a base station in a wireless communication system, transceiver; and A processor comprising: Receive terminal capability information from the terminal, which includes information indicating the maximum number of SRS (sounding reference signal) ports supported by the terminal, wherein the maximum number of SRS ports includes 3; A higher layer setting including an SRS resource with a set number of ports is transmitted to the terminal, and when the number of ports for the SRS resource is 4, one of the 4 ports is identified as unused; Receive an SRS for the SRS resource from the terminal using a port identified based on the number of ports; Transmit scheduling information for uplink transmission to the terminal; and A base station configured to receive the uplink transmission from the terminal based on the scheduling information.

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