Method and apparatus for transmitting / receiving uplink reference signal in wireless communication system

Abstract

A method is provided to be performed by a terminal in a wireless communication system. The method includes: receiving from a base station configuration information related to probe reference signal (SRS) transmission associated with codebook-based uplink transmission, the configuration information including an SRS resource set comprising SRS resources configured by four ports; and transmitting SRS to the base station on the SRS resources using three ports, wherein SRS transmission is not performed on the port with the largest port index among the four ports configuring the SRS resources.

Description

Technical Field

[0001] This disclosure relates to the operation of user equipment (UE) and base stations in a wireless communication system. More specifically, this disclosure relates to a method for transmitting / receiving uplink reference signals in a wireless communication system, and an apparatus capable of performing the method. Background Technology

[0002] Fifth-generation (5G) mobile communication technology defines wide bandwidth, enabling high transmission rates and new services. It can be implemented not only in the "sub-6 GHz" band, such as 3.5 GHz, but also in the "above 6 GHz" band, known as millimeter wave (mmWave), including 28 GHz and 39 GHz. Furthermore, sixth-generation (6G) mobile communication technology (called Super 5G systems) is being considered in terahertz (THz) bands (e.g., the 95 GHz to 3 THz band) to achieve transmission rates fifty times faster than 5G and ultra-low latency one-tenth that of 5G.

[0003] In the early stages of 5G mobile communication technology development, to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), the following technologies have been standardized: beamforming and massive multiple-input multiple-output (MIMO) for reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves; support parameters for dynamic operation (e.g., operating multiple subcarrier spacings) for efficient utilization of millimeter wave resources and time slot formats; initial access technologies for supporting multi-beam transmission and wideband; definition and operation of bandwidth portions (BWP); new channel coding methods such as low-density parity-check (LDPC) codes for large data transmissions and polarity codes for highly reliable transmission of control information; layer 2 (L2) preprocessing; and network slicing for providing dedicated networks for specific services.

[0004] Currently, regarding the services supported by 5G mobile communication technology, the industry is continuously discussing improvements and performance enhancements to the initial 5G mobile communication technology, and physical layer standardization has been completed for technologies such as: Vehicle-to-Everything (V2X) for assisting driving decisions and improving user convenience based on information sent by the vehicle about its location and status; Unlicensed New Radio (NR-U) designed to comply with various regulatory requirements in unlicensed frequency bands for system operation; NR UE power saving; Non-Terrestrial Network (NTN) for direct satellite communication between UEs to ensure coverage in areas where they cannot communicate with terrestrial networks; and positioning.

[0005] Furthermore, standardization of air interface architectures / protocols for technologies such as: Industrial Internet of Things (IIoT) for supporting new services through interoperability and integration with other industries; Integrated Access and Backhaul (IAB) for providing nodes for network service area extension by supporting wireless backhaul and access links in an integrated manner; mobility enhancements including conditional handover and Dual Active Protocol Stack (DAPS) handover; and two-step random access (RACH for NR) for simplifying the random access process. Simultaneously, standardization of system architectures / services for technologies such as: 5G baseline architectures (e.g., service-based architectures or service-based interfaces) for combining Virtual Network Functions (NFV) and Software-Defined Networking (SDN) technologies; and Mobile Edge Computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will connect to communication networks, thus anticipating the need for enhanced functionality and performance of 5G mobile communication systems as well as the integrated operation of connected devices. To this end, new research on the following technologies is on the agenda: Extended Reality (XR) for efficient support of Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR), etc.; 5G performance improvements and complexity reductions through the utilization of Artificial Intelligence (AI) and Machine Learning (ML); AI service support; Metaverse service support; and drone communication.

[0007] Furthermore, this development of 5G mobile communication systems will not only lay the foundation for the development of technologies such as: new waveforms for providing coverage in the terahertz band of 6G mobile communication technology; multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive MIMO; metamaterial-based lenses and antennas for improving terahertz band signal coverage; high-dimensional spatial multiplexing technologies using orbital angular momentum (OAM); and reconfigurable smart surfaces (RIS), but will also lay the foundation for the development of technologies such as: full-duplex technologies for improving the frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technologies for system optimization from the design stage by leveraging satellites and artificial intelligence (AI) and internalizing end-to-end AI support functions; and next-generation distributed computing technologies for providing services at complexity levels exceeding the operational limits of UEs by utilizing ultra-high-performance communication and computing resources.

[0008] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion has been made as to whether any of the above content can be considered as prior art application of this disclosure. Summary of the Invention

[0009] Solution to the problem

[0010] This disclosure aims to at least address the aforementioned problems and / or disadvantages, and to provide at least the advantages described below. Therefore, one aspect of this disclosure provides an apparatus and method capable of efficiently providing services in a wireless communication system.

[0011] Additional aspects will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the presented embodiments.

[0012] According to one aspect of this disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes: receiving from a base station configuration information related to probe reference signal (SRS) transmission associated with codebook-based uplink transmission, the configuration information including an SRS resource set comprising SRS resources configured by four ports; and transmitting SRS to the base station on the SRS resources using three ports, wherein the SRS transmission is not performed on the port with the largest port index among the four ports configuring the SRS resources.

[0013] According to another aspect of this disclosure, a method performed by a base station in a wireless communication system is provided. The method includes: sending to a terminal configuration information related to probe reference signal (SRS) transmission associated with codebook-based uplink transmission, the configuration information including an SRS resource set comprising SRS resources configured by four ports; and receiving SRS from the terminal on the SRS resources using three ports, wherein SRS reception is not performed on the port with the largest port index among the four ports configuring the SRS resources.

[0014] According to another aspect of this disclosure, a terminal in a wireless communication system is provided. The terminal includes: a transceiver; and a controller coupled to the transceiver, wherein the controller is configured to: receive configuration information from a base station related to probe reference signal (SRS) transmission associated with codebook-based uplink transmission, the configuration information including an SRS resource set comprising SRS resources configured by four ports; and transmit SRS to the base station using three ports on the SRS resources, wherein SRS transmission is not performed on the port with the largest port index among the four ports configured for the SRS resources.

[0015] According to another aspect of this disclosure, a base station in a wireless communication system is provided. The base station includes: a transceiver; and a controller coupled to the transceiver, wherein the controller is configured to: transmit to a terminal configuration information related to probe reference signal (SRS) transmission associated with codebook-based uplink transmission, the configuration information including an SRS resource set comprising SRS resources configured by four ports; and receive SRS from the terminal using three ports on the SRS resources, wherein SRS reception is not performed on the port with the largest port index among the four ports configured for the SRS resources.

[0016] An apparatus and method are provided that enable efficient service provision in a wireless communication system.

[0017] Other aspects, advantages, and salient features of this disclosure will become apparent to those skilled in the art from the following detailed description of various embodiments disclosed in conjunction with the accompanying drawings. Attached Figure Description

[0018] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which: Figure 1 The basic structure of the time-frequency domain in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to embodiments of the present disclosure is shown; Figure 3 An example of bandwidth configuration in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 4 An example of base station beam allocation configured according to a Transmission Configuration Indication (TCI) state in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 5 The beam application time that can be considered when using a unified TCI scheme in a wireless communication system according to embodiments of the present disclosure is shown. Figure 6 Another Media Access Control (MAC)-Control Element (CE) structure for activating and indicating a combined TCI state or a separate downlink (DL) or uplink (UL) TCI state in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 7 An example of the configuration of the control resource set of the downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 8 The structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 9 An example of repeated type B transmission of the Physical Uplink Shared Channel (PUSCH) in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 10 A method for determining available time slots during PUSCH repetition type A in a 5G system by a UE according to embodiments of the present disclosure is illustrated. Figure 11 A method for allocating comb offset and cyclic shift during SRS transmission according to embodiments of the present disclosure is illustrated; Figure 12 An SRS antenna switching operation according to an embodiment of the present disclosure is illustrated; Figure 13 The operation of a UE according to an embodiment of the present disclosure is illustrated; Figure 14 The operation of a base station according to an embodiment of the present disclosure is illustrated; Figure 15 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown; and Figure 16 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0019] In all the accompanying drawings, it should be noted that the same reference numerals are used to depict the same or similar elements, features, and structures. Detailed Implementation

[0020] The following description, with reference to the accompanying drawings, is provided to aid in a comprehensive understanding of the various embodiments of this disclosure as defined by the claims and their equivalents. The following description includes various specific details to aid understanding, but these are considered exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Additionally, descriptions of well-known functions and structures may be omitted for clarity and brevity.

[0021] The terms and words used in the following description and claims are not limited to their literal meaning, but are used by the inventors only to enable a clear and consistent understanding of this disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this disclosure is provided for illustrative purposes only and is not intended to limit the disclosure as defined by the appended claims and their equivalents.

[0022] It should be understood that, unless the context explicitly states otherwise, the singular forms “a,” “an,” and “the” include plural indicators. Thus, for example, a reference to “surface of a component” includes a reference to one or more such surfaces.

[0023] In the accompanying drawings, some elements may be exaggerated, omitted, or shown schematically. Furthermore, the size of each element does not perfectly reflect its actual size. Throughout the specification, the same or similar reference numerals indicate the same or similar elements.

[0024] The terminology described below is defined with reference to the functionality in this disclosure and may vary depending on the user, the user's intent, or habits. Therefore, the definitions of the terms should be determined based on the content throughout the specification.

[0025] In the following description, a base station is an entity that allocates resources to a terminal and can be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, and nodes on a network. A terminal can include at least one of a user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In this disclosure, "downlink (DL)" can refer to a radio link through which a base station transmits signals to a terminal, and "uplink (UL)" can refer to a radio link through which a terminal transmits signals to a base station. Furthermore, in the following description, LTE or LTE-Advanced (LTE-A) systems are described by way of example, but embodiments of this disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems can include 5G, NR, and 5G mobile communication technologies developed after LTE-A, and in the following description, "5G" can be a concept encompassing existing LTE, LTE-A, and other similar services. Furthermore, based on the judgment of those skilled in the art, this disclosure can be applied to other communication systems with some modifications without significantly departing from the scope of this disclosure.

[0026] It should be understood that each box in a flowchart illustration, and combinations of boxes in a flowchart illustration, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium that can direct the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of writing including instruction means that implement the functions specified in the one or more flowchart boxes. Instructions that execute on a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable data processing apparatus to produce a computer-implemented process can provide steps for implementing the functions specified in the flowchart boxes.

[0027] Furthermore, each box in the flowchart diagram may represent a module, code segment, or code section, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the boxes may occur out of order. For example, two boxes shown consecutively may actually be executed substantially simultaneously, or the boxes may sometimes be executed in reverse order, depending on the functionality involved.

[0028] As used in embodiments of this disclosure, the term "unit" refers to a software or hardware element, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC), that performs a predetermined function, and a "unit" may perform certain functions. However, "unit" is not always limited to software or hardware. A "unit" may be configured to be stored in addressable storage media or to execute one or more processors. Thus, a unit includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" may be combined into a smaller number of elements or "units," or divided into a larger number of elements or "units." Furthermore, elements and "units" may be implemented as one or more central processing units (CPUs) within a playback device or a secure multimedia card. Additionally, a "unit" in this disclosure may include one or more processors.

[0029] Wireless communication systems are evolving into broadband wireless communication systems that use communication standards such as 3GPP High-Speed ​​Packet Access (HSPA), LTE (Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 High-Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), IEEE 802.16e, etc., to provide high-speed and high-quality packet data services as well as typical voice-based services.

[0030] According to an embodiment, as a typical example of a broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in the downlink (DL). In the uplink (UL), a Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme can be used. The uplink can refer to the radio link through which a User Equipment (UE) or Mobile Station (MS) transmits data or control signals to a Base Station (BS) or eNode B, and the downlink can refer to the radio link through which the Base Station transmits data or control signals to the UE. The multiple access scheme can separate the data or control information of the respective users by allocating and manipulating the time-frequency resources used to transmit data or control information for each user, so as to avoid overlap (i.e., to establish orthogonality).

[0031] According to the embodiments, since 5G communication systems, as communication systems following LTE, must freely reflect the various requirements of users, service providers, etc., they must support services that meet various requirements. Services considered in 5G communication systems include enhanced mobile broadband (eMBB) communication, massive machine-type communication (mMTC), ultra-reliable low-latency communication (URLLC), etc.

[0032] According to embodiments, eMBB is designed to provide higher data rates than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, for a single base station, eMBB must provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink. Furthermore, the 5G communication system must provide the UE with increased user-aware data rates and a maximum data rate. To meet these requirements, improvements to various transmit / receive technologies, including further enhanced multiple-input multiple-output (MIMO) transmission techniques, may be necessary. Additionally, the data rates required by 5G communication systems can be achieved using frequency bandwidths exceeding 20 MHz in the 3 to 6 GHz band, or 6 GHz or higher, instead of using a maximum of 20 MHz of transmission bandwidth in the 2 GHz band used in LTE.

[0033] Furthermore, in 5G communication systems, mMTC is considered to support application services such as the Internet of Things (IoT). mMTC has requirements such as supporting a large number of UEs within a cell, enhancing UE coverage, improving battery life, and reducing UE costs in order to effectively deliver IoT. Since IoT provides communication functions while being provided to various sensors and devices, it must support a large number of UEs within a cell (e.g., 1,000,000 UEs / km). 2 Additionally, mMTC-enabled UEs may require wider coverage than other services provided by 5G communication systems because the UE is likely to be located in shaded areas such as building basements, which are not covered by cell coverage due to the nature of the service. mMTC-enabled UEs must be configured to be inexpensive and may require very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the UE's battery.

[0034] Finally, URLLC is a mission-critical wireless communication service based on cellular networks. For example, URLLC can be used for services such as remote control of robots or machines, industrial automation, unmanned aerial vehicles, remote healthcare, and emergency alerts. Therefore, URLLC must provide communication with ultra-low latency and ultra-high reliability. For example, services supporting URLLC should meet an air interface latency of less than 0.5 ms and also require 10 -5 Or even lower packet error rates. Therefore, for services supporting URLLC, 5G systems must provide shorter transmission time intervals (TTIs) than other services, and may require designs that allocate significant resources within the frequency band to ensure the reliability of communication links.

[0035] According to embodiments, the three services in 5G (i.e., eMBB, URLLC, and mMTC) can be multiplexed and transmitted within a single system. In this case, different transmit / receive technologies and parameters can be used between services to meet the diverse requirements of various services. Of course, 5G is not limited to the three services described above.

[0036] In the following description, the term "a / b" can be understood as at least one of a and b.

[0037] It should be understood that the boxes in each flowchart and the combination of flowcharts can be executed by one or more computer programs including instructions. The entirety of one or more computer programs can be stored in a single memory device, or one or more computer programs can be divided into different parts and stored in different multiple memory devices.

[0038] Any of the functions or operations described herein can be processed by one processor or a combination of processors. One processor or a combination of processors is a circuit system that performs processing and includes, for example, an application processor (AP, e.g., a central processing unit (CPU)), a communication processor (CP, e.g., a modem), a graphics processing unit (GPU), a neural processing unit (NPU) (e.g., an artificial intelligence (AI) chip), a Wi-Fi chip, Bluetooth, etc. ® Circuit systems including chips, GPS chips, NFC chips, connectivity chips, sensor controllers, touch controllers, fingerprint sensor controllers, display driver integrated circuits (ICs), audio codec (CODEC) chips, universal serial bus (USB) controllers, camera controllers, image processing ICs, microprocessor units (MPUs), system-on-a-chip (SoCs), and other ICs.

[0039] [NR Time and Frequency Resources]

[0040] The frame structure of a 5G system will be described in more detail below with reference to the accompanying drawings.

[0041] Figure 1 The basic structure of the time-frequency domain in a 5G system according to an embodiment of the present disclosure is shown. The time-frequency domain is a radio resource domain used for transmitting data or control channels.

[0042] refer to Figure 1 , Figure 1 The horizontal axis in the diagram represents the time domain, and Figure 1 The vertical axis in the time-frequency domain represents the frequency domain. The basic unit of a resource in the time-frequency domain is a resource element (RE) 101, which can be defined as an orthogonal frequency division multiplexing (OFDM) symbol 102 on the time axis and a subcarrier 103 on the frequency axis. In the frequency domain, (For example, 12) consecutive REs can constitute a resource block (RB) 104. In the time domain, a subframe 110 can include multiple OFDM symbols 102. For example, the length of a subframe can be 1 ms.

[0043] Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to embodiments of the present disclosure is shown.

[0044] refer to Figure 2 , Figure 2 An example of the structure of frame 200, subframe 201, and time slot 202 is shown. A frame 200 can be defined as 10 ms. A subframe 201 can be defined as 1 ms, and therefore a frame 200 can include a total of 10 subframes 201.

[0045] According to an embodiment, a time slot 202 or 203 can be defined as 14 OFDM symbols. For example, =14 can refer to the number of symbols in each time slot. A subframe 201 may include one or more time slots 202 and 203, and the number of time slots 202 and 203 in each subframe 201 may vary depending on the configuration value µ 204 or 205 of the subcarrier spacing.

[0046] Figure 2 The examples illustrate the cases where the configuration values ​​μ=0 (204) and μ=1 (205) are used as subcarrier spacing. In the case of μ=0 (204), a subframe 201 may include one time slot 202, and in the case of μ=1 (205), a subframe 201 may include two time slots 203. That is, the number of time slots per subframe... The number of slots per frame can vary depending on the subcarrier spacing configuration value μ. They can be different. and The value μ can be defined based on the configuration of each subcarrier spacing, as shown in Table 1 below.

[0047] Table 1

[0048] [Bandwidth Component (BWP)]

[0049] The bandwidth portion (BWP) configuration in a 5G communication system will be described in detail below with reference to the accompanying drawings.

[0050] Figure 3 An example of bandwidth configuration in a wireless communication system according to an embodiment of the present disclosure is shown.

[0051] refer to Figure 3 , Figure 3 An example is shown where the UE bandwidth 300 is configured to include two bandwidth portions (i.e., bandwidth portion #1 (BWP#1) 301 and bandwidth portion #2 (BWP#2) 302). The base station can configure one or more bandwidth portions for the UE, and can configure the following information as given in Table 2 below for each bandwidth portion.

[0052] Table 2

[0053] The information configured for the UE is not limited to the examples above, and in addition to the configuration information in Table 2, various parameters related to bandwidth portions can also be configured for the UE. The base station can transmit the configuration information to the UE via upper-layer signaling (e.g., Radio Resource Control (RRC) signaling). At least one of one or more bandwidth portions configured for the UE can be activated. Whether the configured bandwidth portion is activated can be transmitted from the base station to the UE semi-statically via RRC signaling or dynamically via downlink control information (DCI).

[0054] According to an embodiment, prior to Radio Resource Control (RRC) connection, the base station can configure an Initial Bandwidth Part (BWP) for initial access for the UE via a Master Information Block (MIB). For example, the UE can receive configuration information about the Control Resource Set (CORESET) and a search space that can be used to transmit the Physical Downlink Control Channel (PDCCH) during the initial access step. This PDCCH is used to receive system information required for initial access via the MIB (which may correspond to Residual System Information (RMSI) or System Information Block 1 (SIB1)).

[0055] According to an embodiment, each of the control resource set and search space configured via the MIB can be considered as identifier (ID) 0 or identified therefrom. The base station can notify the UE of configuration information regarding control resource set #0 via the MIB, such as frequency allocation information, time allocation information, and / or parameter sets. Additionally, the base station can notify the UE of configuration information regarding the monitoring period and timing for control resource set #0 via the MIB, i.e., configuration information regarding search space #0. The UE can identify or consider the frequency domain configured by control resource set #0 obtained from the MIB as, or as, the initial bandwidth portion used for initial access. The ID of the initial bandwidth portion can be considered as 0.

[0056] According to embodiments, the bandwidth portion of the configuration supported by 5G can be used for various purposes.

[0057] According to an embodiment, if the bandwidth supported by the UE is less than the system bandwidth, the base station can support the UE's data communication through bandwidth configuration. For example, the base station can configure the frequency position of the bandwidth portion for the UE (configuration information 2), so that the UE can send / receive data at a specific frequency position (e.g., the configured frequency position) within the system bandwidth.

[0058] According to an embodiment, the base station can configure multiple bandwidth portions for the UE to support different parameter sets. For example, to support a specified UE transmitting / receiving data using both 15kHz and 30kHz subcarrier intervals, the base station can configure the two bandwidth portions to 15kHz and 30kHz subcarrier intervals for the specified UE, respectively. Different bandwidth portions may require frequency division multiplexing (FDM), and the bandwidth portion configured for the corresponding subcarrier interval can be activated if data is transmitted / received at a specific subcarrier interval.

[0059] According to an embodiment, the base station can configure bandwidth portions with different bandwidth sizes for the UE to reduce the power consumption of the UE. For example, if the UE supports a fairly large bandwidth (e.g., 100MHz) and always sends / receives data using the supported bandwidth, a considerable amount of power consumption may occur. In particular, from a power consumption perspective, unnecessarily monitoring the downlink control channel with a large bandwidth of 100MHz when there is no service may be quite inefficient. To reduce the UE's power consumption, the base station can configure a bandwidth portion with a relatively small bandwidth for the UE (e.g., a bandwidth portion of 20MHz). The UE can perform monitoring operations in the 20MHz bandwidth portion when there is no service, and if data has occurred, it can send / receive data using the 100MHz bandwidth portion as instructed by the base station.

[0060] According to an embodiment, regarding the bandwidth portion configuration method, the UE can receive configuration information about the initial bandwidth portion (initial BWP) via the MIB during the initial access step before RRC connection. For example, the UE may have a control resource set (i.e., CORESET) configured for the downlink control channel, which can be used to transmit DCI for scheduling System Information Blocks (SIBs) according to the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control resource set configured by the MIB can be regarded as the initial bandwidth portion, and the UE can receive the Physical Downlink Shared Channel (PDSCH) through which SIBs are transmitted via the configured initial bandwidth portion. The initial bandwidth portion can be used not only for the purpose of receiving SIBs, but also for other System Information (OSI), paging, and / or random access.

[0061] According to an embodiment, if one or more bandwidth portions are configured for a UE, the base station can indicate to the UE to change (or switch or transform) the bandwidth portion by using the bandwidth portion indicator field within the DCI. For example, if the UE's currently active bandwidth portion is... Figure 3If the bandwidth portion #1 301 is in the DCI, the base station can use the bandwidth portion indicator in the DCI to indicate the bandwidth portion #2 302, and the UE can change (or switch) the bandwidth portion to the bandwidth portion #2 302 indicated by the bandwidth portion indicator in the received DCI.

[0062] As described above, bandwidth portion changes based on DCI can be indicated by the DCI used to schedule PDSCH or PUSCH, and therefore, upon receiving a bandwidth portion change request, the UE needs to be able to receive or transmit PDSCH or PUSCH scheduled by the corresponding DCI without problems within the changed bandwidth portion. For this purpose, the delay time (T) required during the bandwidth portion change... BWP The requirements are specified in the standard and can be defined, for example, as given in Table 3 below.

[0063] Table 3

[0064] According to an embodiment, the requirement for partial bandwidth change delay time can support either Type 1 or Type 2, depending on the UE's capabilities. The UE can report the supported partial bandwidth change delay time types to the base station. For example, the partial bandwidth delay time can vary depending on the UE's capabilities, and the UE can report the partial bandwidth change delay time type determined based on the UE's capabilities to the base station. The partial bandwidth change delay time type can indicate the partial bandwidth change delay time.

[0065] According to an embodiment, if the UE has received a DCI including a bandwidth partial change indicator in time slot n, then, based on (or according to) the requirement for bandwidth partial change delay time, the UE can proceed no later than time slot n+T. BWP The change is completed at a specific time point, to the new bandwidth portion indicated by the bandwidth portion change indicator, and the UE can send / receive data channels scheduled by the corresponding DCI in the new bandwidth portion.

[0066] According to an embodiment, if the base station wants to schedule the data channel by using a new bandwidth portion, the base station can change the delay time (T) based on the UE's bandwidth portion. BWP This determines the temporal resource allocation for the data channel. In other words, when scheduling a data channel using a new bandwidth portion, combined with the determination of the temporal resource allocation for the data channel, the base station can schedule the corresponding data channel at a time point after the bandwidth portion change delay time. Therefore, the UE may not expect the DCI indicating the bandwidth portion change to indicate a time less than the bandwidth portion change delay time (T). BWP The time slot offset (K0 or K2) value.

[0067] According to an embodiment, if the UE has received a DCI indicating a partial change in bandwidth (e.g., DCI format 1_1 or 0_1), the UE may refrain from transmitting or receiving during the time interval from the third symbol of the slot used to receive the corresponding DCI that includes the partial change in bandwidth to the start point of the slot indicated by the slot offset (K0 or K2) value. For example, the slot offset (K0 or K2) value may be indicated by the time domain resource allocation indicator field in the corresponding DCI.

[0068] For example, if the UE has received a DCI indicating a partial change in bandwidth in time slot n, and the time slot offset value indicated by the corresponding DCI is K, then the UE may not perform transmission or reception from the third symbol of time slot n to the symbols before time slot n+K (i.e., the last symbol of time slot n+K-1).

[0069] [QCL, TCI status]

[0070] In wireless communication systems, one or more different antenna ports (which may be replaced by one or more channels, signals, and combinations thereof, but for convenience, will be collectively referred to as different antenna ports in the following description of this disclosure) can be associated with each other through quasi-co-location (QCL) configurations as shown in Table 4 below. The TCI state is used to announce the QCL relationship between the PDCCH (or PDCCH demodulation reference signal (DRMS)) and another RS ​​or channel, and the description of quasi-co-location between reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) implies that the UE is allowed to apply some or all of the large-scale channel parameters estimated in antenna port A to channel measurements from antenna port B. QCL needs to be associated with different parameters depending on whether: 1) time tracking is affected by average delay and delay spread, 2) frequency tracking is affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) is affected by average gain, or 4) beam management (BM) is affected by spatial parameters. Therefore, four types of QCL relationships are supported in NR as shown in Table 10 below.

[0071] Table 4

[0072] The spatial RX parameter can be used as a whole to refer to some or all of the various parameters, such as angle of arrival (AoA), power angle spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0073] QCL relationships can be configured for the UE using the RRC parameters TCI-State and QCL-Info in Table 5 below. Referring to Table 5, the base station can configure one or more TCI states for the UE, thereby notifying up to two types of QCL relationships (qcl-Type1, qcl-Type2) associated with the RS (i.e., the target RS) that serves as the ID representing the TCI state. Each QCL information (QCL-Info) for each TCI state may include the serving cell index and the BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference BS, and the QCL type as shown in Table 5 above.

[0074] Table 5

[0075] Figure 4 An example of base station beam allocation configured according to TCI state according to an embodiment of the present disclosure is shown.

[0076] refer to Figure 4 The base station can transmit information about N different beams to the UE through N different TCI states. For example, in... Figure 4 When N=3, the base station can configure the qcl-Type2 parameters included in the three TCI states 400, 405 and 410 of QCL type D (when associated with the Channel State Information Reference Signal (CSI-RS) or Synchronization Signal Block (SSB) corresponding to different beams) to notify that the antenna ports referring to different TCI states 400, 405 and 410 are associated with different spatial Rx parameters (i.e. different beams).

[0077] Tables 6 to 10 below enumerate the valid TCI state configurations based on the target antenna port type.

[0078] Table 6 enumerates the valid TCI state configurations when the target antenna port is a CSI-RS used for tracking (i.e., Tracking Reference Signal (TRS)). A TRS is a non-zero power (NZP) CSI-RS in which no repeating parameter is configured and its trs-Info is configured as "true". In Table 6, configuration number 3 can be used for aperiodic TRS.

[0079] Table 6

[0080] Effective TCI state configuration when the target antenna port is a CSI-RS (TRS) for tracking.

[0081] Table 7 enumerates the valid TCI state configurations when the target antenna port is a CSI-RS for CSI. A CSI-RS for CSI refers to an NZP CSI-RS in which no parameter indicating repetition is configured (e.g., a repeating parameter) and its trs-Info is configured as "true".

[0082] Table 7

[0083] Valid TCI state configuration when the target antenna port is a CSI-RS for CSI.

[0084] Table 8 enumerates the valid TCI state configurations when the target antenna port is a CSI-RS for beam management (BM) (which has the same meaning as a CSI-RS for L1 reference signal received power (RSRP) reporting). A CSI-RS for BM refers to an NZP CSI-RS in which the repetition parameter in the CSI-RS is configured to have a value of "on" or "off" and its trs-Info is not configured to "true".

[0085] Table 8

[0086] Valid TCI state configuration when the target antenna port is for BM's CSI-RS (for L1 RSRP reporting).

[0087] Table 9 enumerates the valid TCI state configurations when the target antenna port is PDCCH DMRS.

[0088] Table 9

[0089] Effective TCI state configuration when the target antenna port is PDCCH DMRS

[0090] Table 10 enumerates the valid TCI state configurations when the target antenna port is PDSCH DMRS.

[0091] Table 10

[0092] Effective TCI state configuration when the target antenna port is PDSCH DMRS

[0093] Based on the representative QCL configuration methods in Tables 6 to 10 above, the target antenna port and reference antenna port for each step are configured and operated, such as "SSB" -> "TRS" -> "CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS". Therefore, the UE's reception operation can be aided by associating statistical characteristics measurable from the SSB and TRS with the corresponding antenna ports.

[0094] [Unified TCI Status]

[0095] The following describes a method for indicating and activating individual TCI states based on a unified TCI scheme. A unified TCI scheme can refer to a scheme in which, although existing Rel-15 and Rel-16 already use TCI state schemes for UE downlink reception and spatial relationship information schemes for uplink transmission (separate transmit / receive beam management schemes), they are managed in an integrated manner using TCI states. Therefore, when the UE receives instructions from the base station based on the unified TCI scheme, the UE can also perform beam management for uplink transmissions using TCI states. If the base station has already configured a TCI-State (higher-layer signaling) with tci-stateId-r17 (higher-layer signaling) for the UE, the UE can perform operations based on the unified TCI scheme using the TCI-State. TCI-States can exist in two types (joint TCI states or individual TCI states).

[0096] According to the first type (joint TCI state), the base station can indicate to the UE, via a TCI-State, both the TCI states to be applied to uplink transmission and downlink reception. If a TCI-State based on the joint TCI state has already been indicated to the UE, the parameters to be used for downlink channel estimation can be indicated to the UE using the RS corresponding to qcl-Type1 in the TCI-State based on the joint TCI state, and the parameters to be used as the downlink receive beam or receive filter can be indicated to the UE using the RS corresponding to qcl-Type2 in the TCI-State. If a TCI-State based on the joint TCI state has already been indicated to the UE, the parameters to be used as the uplink transmit beam or transmit filter can be indicated to the UE using the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL / UL TCI state. If a joint TCI state has already been indicated to the UE, the UE can apply the same beam to both uplink transmission and downlink reception.

[0097] According to the second type (separate TCI states), the base station can indicate to the UE the UL TCI state to be applied to uplink transmission and the DL TCI state to be applied to downlink reception, respectively. If the UL TCI state has already been indicated to the UE, the parameters to be used as the uplink transmission beam or transmission filter can be indicated to the UE using the reference RS or source RS configured in the UL TCI state. If the DL TCI state has already been indicated to the UE, the parameters to be used for downlink channel estimation can be indicated to the UE using the RS corresponding to qcl-Type1 in the DL TCI state, and the parameters to be used as the downlink reception beam or reception filter can be indicated to the UE using the RS corresponding to qcl-Type2 therein.

[0098] If both the DL TCI state and the UL TCI state have been indicated to the UE, the parameters to be used as the uplink transmit beam or transmit filter can be indicated to the UE using the reference RS or source RS configured in the UL TCI state. The parameters to be used for downlink channel estimation can be indicated to the UE using the RS corresponding to qcl-Type1 configured in the DL TCI state, and the parameters to be used as the downlink receive beam or receive filter can be indicated to the UE using the RS corresponding to qcl-Type2 configured therein. If the DL TCI state indicated to the UE is different from the reference RS or source RS configured in the UL TCI state, the UE can apply separate beams to uplink transmit and downlink receive based on the indicated UL TCI state and DL TCI state, respectively.

[0099] The base station can configure up to 128 joint TCI states for the UE via higher-layer signaling for each bandwidth segment within a specific cell. Within individual TCI states, based on the UE capability report, up to 64 or 128 DL TCI states can be configured via higher-layer signaling for each bandwidth segment within a specific cell. In individual TCI states, DL TCI states and joint TCI states can use the same higher-layer signaling structure. For example, if 128 joint TCI states have already been configured, and if 64 DL TCI states from individual TCI states have already been configured, then the 64 DL TCI states can be included within the 128 joint TCI states.

[0100] Within a single TCI state, based on the UE capability report, up to 32 or 64 UL TCI states can be configured via higher-layer signaling for each bandwidth portion within a specific cell. Similar to the relationship between DL TCI states and joint TCI states within a single TCI state, UL TCI states and joint TCI states within a single TCI state can also use the same higher-layer signaling structure. However, UL TCI states within a single TCI state can use different higher-layer signaling structures than the joint TCI states and DL TCI states within a single TCI state.

[0101] The use of different or the same higher-layer signaling structures can be defined in the specification, or it can be distinguished by different higher-layer signaling configured by the base station based on a UE capability report containing information about which of two schemes the UE can support.

[0102] The UE can use either a joint TCI state or a separate TCI state configured by the base station, thereby receiving indications about the transmit / receive beams according to a unified TCI scheme. The base station can configure the UE to use either the joint TCI state or the separate TCI state via higher-layer signaling.

[0103] The UE can receive indications about the transmit / receive beams by using a scheme selected from the joint TCI state and the individual TCI state via higher-layer signaling, and the base station can indicate the transmit / receive beams using two methods (MAC-CE-based indication method, and MAC-CE-based activation and DCI-based indication method).

[0104] If the UE receives an indication of the transmit / receive beam using a joint TCI state via higher-layer signaling, the UE can receive a MAC-CE indicating the joint TCI state from the BS, thereby performing transmit / receive beam application operations, and the base station can schedule the reception of the PDSCH including the MAC-CE for the UE via the PDCCH. If the MAC-CE includes a joint TCI state, then 3 ms after transmitting the Physical Uplink Control Channel (PUCCH) including a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message indicating whether the PDSCH including the MAC-CE has been successfully received, the UE can determine the uplink transmit beam or transmit filter and the downlink receive beam or receive filter by using the indicated joint TCI state. If the MAC-CE includes two or more joint TCI states, the UE can identify the corresponding code points in the TCI state field of DCI format 1_1 or 1_2 corresponding to the multiple joint TCI states indicated by the MAC-CE, and then activate the indicated joint TCI state 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether the PDSCH including the MAC-CE has been successfully received. Thereafter, the UE can receive DCI format 1_1 or 1_2 and can apply one joint TCI state indicated by the TCI state field within the corresponding DCI to the uplink transmit beam and downlink receive beam. DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL allocation), or may not include such downlink data channel scheduling information (without DL allocation).

[0105] If the UE receives an indication of the transmit / receive beam using a separate TCI state via higher-layer signaling, the UE can receive a MAC-CE indicating the separate TCI state from the BS, thereby performing transmit / receive beam application operations, and the base station can schedule the reception of the PDSCH including the MAC-CE for the UE via the PDCCH. If the MAC-CE includes a separate set of TCI states, then 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether the PDSCH has been successfully received, the UE can determine the uplink transmit beam or transmit filter and the downlink receive beam or receive filter by using the separate TCI states included in the indicated separate TCI state set. A separate TCI state set can refer to a single separate TCI state or multiple separate TCI states that a code point of the TCI state field in DCI format 1_1 or 1_2 can have. A separate TCI state set can include a DL TCI state, can include a UL TCI state, or can include a DL TCI state and a UL TCI state. If the MAC-CE includes two or more individual TCI state sets, the UE can identify the corresponding code points of the TCI state fields in DCI format 1_1 or 1_2 corresponding to the multiple individual TCI state sets indicated by the MAC-CE, and then activate the indicated individual TCI state sets 3ms after transmitting a PUCCH including HARQ-ACK information indicating whether the PDSCH has been successfully received. Each code point of the TCI state field in DCI format 1_1 or 1_2 can indicate a DL TCI state, a UL TCI state, or both. The UE can receive DCI format 1_1 or 1_2 and can apply the individual TCI state sets indicated by the TCI state fields in the corresponding DCI to the uplink transmit beam and downlink receive beam. DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL allocation) or may not include such downlink data channel scheduling information (without DL allocation).

[0106] Figure 5 The beam application time that can be considered in the case of using a unified TCI scheme in a wireless communication system according to embodiments of the present disclosure is shown.

[0107] As described above, the UE can receive DCI format 1_1 or 1_2 from the base station, which includes downlink data channel scheduling information (with DL allocation) or does not include such downlink data channel scheduling information (without DL allocation), and can apply a joint TCI state or a set of individual TCI states indicated by the TCI state field in the corresponding DCI to the uplink transmit beam and the downlink receive beam.

[0108] - DCI format 1_1 or 1_2 (000) with DL allocation: If the UE receives DCI format 1_1 or 1_2 (001) from the base station, which includes downlink data channel scheduling information, thereby indicating a joint TCI state or a single TCI state set based on the unified TCI scheme, then the UE can receive the PDSCH (005) scheduled based on the received DCI, and can send a PUCCH (010) including a HARQ-ACK indicating whether the DCI and PDSCH were successfully received. The HARQ-ACK can indicate whether both the DCI and PDSCH were successfully received. If at least one of the DCI and PDSCH is not received, the UE can send a negative acknowledgment (NACK). If both are successfully received, the UE can send an ACK.

[0109] - DCI format 1_1 or 1_2 (050) without DL allocation: If the UE receives DCI format 1_1 or 1_2 (055) from the base station that does not include downlink data channel scheduling information, thereby indicating a joint TCI state or a separate TCI state set based on a unified TCI scheme, the UE may assume a combination of at least one of the following details for the corresponding DCI.

[0110] ■ Includes Cyclic Redundancy Check (CRC) scrambled using the configured Schedule (CS) - Radio Network Temporary Identifier (RNTI).

[0111] ■ All bits in all fields assigned to the redundant version (RV) field have a value of 1.

[0112] ■ All bits assigned to all fields used as modulation and coding scheme (MCS) fields have a value of 1.

[0113] ■ All bits assigned to all fields used as New Data Indicator (ND) fields have a value of 1.

[0114] In the case of Frequency Domain Resource Allocation (FDRA) type 0, all bits allocated to the FDRA field have a value of 0. In the case of FDRA type 1, all bits allocated to the FDRA field have a value of 1. In the case of FDRA type dynamicSwitch, all bits allocated to the FDRA field have a value of 0.

[0115] Assuming the above details (060), the UE may send a PUCCH including an indication of whether a HARQ-ACK in DCI format 1_1 or 1_2 has been successfully received.

[0116] - For both DCI formats 1_1 and 1_2 with DL allocation (000) and without DL allocation (050), if the new TCI state indicated by the DCI (001, 055) is the same as the TCI state previously indicated and applied to the transmit and downlink receive beams, the UE can maintain the previously applied TCI state. If the new TCI state is different from the previously indicated TCI state, the UE can determine that the time point at which the application of the joint TCI state or the set of individual TCI states indicated by the TCI state field included in the DCI arrives after the first time slot (020, 070) (030, 080) after the beam application time (BAT) (015, 065) from the PUCCH transmission, and the previously indicated TCI state can be used until (025, 075) of time slot (020, 070).

[0117] - For DCI formats 1_1 or 1_2 with DL allocation (000) and without DL allocation (050), BAT can be configured with a specific number of OFDM symbols via higher-layer signaling based on UE capability report information, and the parameter set for BAT and the first time slot after BAT can be determined based on the minimum parameter set among all cells that have applied the joint TCI state or individual TCI state set indicated by DCI.

[0118] The UE can apply a joint TCI state indicated by MAC-CE or DCI to: the reception of resource control sets connected to all UE-specific search spaces, the reception of PDSCHs scheduled by PDCCHs sent from the corresponding control resource sets, the transmission of PUSCHs, and the transmission of all PUCCH resources.

[0119] In the case where a single TCI state set indicated by MAC-CE or DCI includes a DL TCI state, based on the previously indicated UL TCI state, the UE may apply the single TCI state set to: reception of control resource sets connected to all UE-specific search spaces, and reception of PDSCH scheduled by PDCCH sent from the corresponding control resource set, and may apply the single TCI state set to all PUSCH and PUCCH resources.

[0120] In the case where a single TCI state set indicated by MAC-CE or DCI includes a UL TCI state, the UE may apply the single TCI state set to all PUSCH and PUCCH resources based on the previously indicated DL TCI state, and may apply the single TCI state set to: reception of control resource sets connected to all UE-specific search spaces, and reception of PDSCH scheduled by PDCCH sent from the corresponding control resource set.

[0121] In the case where a single TCI state set indicated by MAC-CE or DCI includes a DL TCI state and a ULTCI state, the UE may apply the DL TCI state to: reception of control resource sets connected to all UE-specific search spaces and reception of PDSCH scheduled by PDCCH sent from the corresponding control resource set, and may apply the ULTCI state to all PUSCH and PUCCH resources.

[0122] [Unified TCI Status MAC-CE]

[0123] The following describes a method for indicating and activating individual TCI states based on a unified TCI scheme. The base station can configure a PDSCH for the UE including the following MAC-CEs, and then, after three time slots for sending HARQ-ACKs about the PDSCH to the base station, the UE 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-CEs received from the base station. That is, the UE can activate each entry of the MAC-CEs received from the base station for each code point of the TCI state field in DCI format 1_1 or 1_2.

[0124] Figure 6 Another MAC-CE structure for activating and indicating a combined TCI state or a separate DL or UL TCI state in a wireless communication system according to an embodiment of this disclosure is shown. Each field of the MAC-CE structure may have the following meaning: - Serving Cell ID (000): This field indicates which serving cell MAC-CE should be applied to. This field can have a length of five digits. If the serving cell indicated by this field is included in one or more of simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 (higher-layer signaling), then MAC-CE can be applied to all serving cells included in one or more of the lists of simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, and simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0125] -DL BWP ID (005): This field indicates which DL BWP the MAC-CE should be applied to, and the meaning of each code point in this field can correspond to each code point in the bandwidth portion indicator in the DCI. This field can have a length of two bits.

[0126] -UL BWP ID (010): This field indicates which UL BWP the MAC-CE should be applied to, and the meaning of each code point in this field can correspond to each code point of the bandwidth portion indicator in the DCI. This field can have a two-bit length.

[0127] -Pi (015): This field indicates whether each code point in the TCI state field of DCI format 1_1 or 1_2 has multiple TCI states or only one TCI state. If Pi is "1", it means that the corresponding i-th code point has multiple TCI states, and this may mean that the corresponding code point can include a single DL TCI state and a single UL TCI state. If Pi is "0", it means that the corresponding i-th code point has a single TCI state, and this may mean that the corresponding code point can include a combined TCI state as well as one of a single DL TCI state and a single UL TCI state.

[0128] -D / U (020): This field indicates whether the TCI status ID field in the same octet corresponds to a combined TCI status, a separate DL TCI status, or a separate UL TCI status. If this field is 1, the TCI status ID field in the same octet can correspond to a combined TCI status or a separate DL TCI status. If this field is 0, the TCI status ID field in the same octet can correspond to a separate UL TCI status.

[0129] -TCI State ID (025): This field indicates the TCI state that can be identified by TCI-StateId (higher-layer signaling). If the D / U field is configured to 1, this field can be used to express the TCI-StateId, which can be represented by 7 bits. If the D / U field is configured to 0, the most significant bit (MSB) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the UL-TCIState-Id (higher-layer signaling). In the case of combined TCI states, the maximum number of TCI states that can be activated is 8, and in the case of individual DL or UL TCI states, it can be 16.

[0130] -R: This refers to reserved bits and can be configured to 0.

[0131] about Figure 6 In the MAC-CE structure described above, the UE can... Figure 6 The third octet of fields P1, P2, ..., P8 is included in the MAC-CE structure, regardless of whether the unifiedTCI-StateType-r17 in MIMOparam-r17 of ServingCellConfig (higher-layer signaling) is configured as unified or as separate. In this case, the UE can perform TCI state activation by using a fixed MAC-CE structure, regardless of the higher-layer signaling configured by the base station. As another example, regarding... Figure 6 The MAC-CE structure described above can be omitted by the UE if unifiedTCI-StateType-r17 in MIMOparam-r17 of ServingCellConfig (higher-layer signaling) is configured as united. Figure 6 This includes the third octet of fields P1, P2, ..., P8. In this case, the UE can save up to 8 bits of MAC-CE payload according to the higher-layer signaling configured by the base station. Additionally, from... Figure 6 Starting from the fourth octet, all D / U fields in the first position can be treated as R fields, and all R fields can be configured to 0 bits.

[0132] [PDCCH: About DCI]

[0133] The following text will describe downlink control information (DCI) in 5G communication systems in detail.

[0134] According to an embodiment, in a 5G system, scheduling information regarding uplink data (or Physical Uplink Shared Channel (PUSCH)) or downlink data (or Physical Downlink Shared Channel (PDSCH)) can be included in the DCI and transmitted from the base station to the UE via the DCI. The UE can monitor the fallback DCI format and the non-fallback DCI format for either the PUSCH or the PDSCH. The fallback DCI format may include predefined fixed fields between the base station and the UE, while the non-fallback DCI format may include configurable fields.

[0135] DCI may require channel coding and modulation processing, and is then transmitted via or on the Physical Downlink Control Channel (PDCCH). Cyclic Redundancy Check (CRC) can be appended to the payload of the DCI message, and the CRC can be scrambled using a Radio Network Temporary Identifier (RNTI) corresponding to the UE's identifier. Different RNTIs can be used depending on the purpose of the DCI message (e.g., UE-specific data transmission, power control command, or random access response). That is, the RNTI may not be explicitly sent, but can be sent during the CRC calculation process. Upon receiving a DCI message transmitted on the PDCCH, the UE can identify the CRC using the assigned RNTI, and if the CRC identification is correct, the UE can recognize or know that the corresponding message has been sent to the UE.

[0136] For example, the DCI used for scheduling PDSCH about System Information (SI) can be scrambled by SI-RNTI. The DCI used for scheduling PDSCH about Random Access Response (RAR) messages can be scrambled by RA-RNTI. The DCI used for scheduling PDSCH about paging messages can be scrambled by P-RNTI. The DCI used for notifying Slot Format Indicator (SFI) can be scrambled by SFI-RNTI. The DCI used for notifying Transmit Power Control (TPC) can be scrambled by TPC-RNTI. The DCI used for scheduling UE-specific PDSCH or PUSCH can be scrambled by Cell RNTI (C-RNTI).

[0137] According to an embodiment, DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, and in this case, CRC can be scrambled by C-RNTI. The DCI format 0_0 with CRC scrambled by C-RNTI can include at least some of the following information given in Table 11 below.

[0138] Table 11

[0139] DCI format 0_1 ​​can be used as a non-back-off DCI for scheduling PUSCH, and in this case, CRC can be scrambled by C-RNTI. The DCI format 0_1 ​​with CRC scrambled by C-RNTI can include, for example, the following information given in Table 12 below.

[0140] Table 12

[0141] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, and in this case, CRC can be scrambled by C-RNTI. The DCI format 1_0 with CRC scrambled by C-RNTI can include at least some of the following information, as shown in Table 13 below.

[0142] Table 13

[0143] DCI format 1_1 can be used as a non-back-off DCI for scheduling PDSCH, and in this case, CRC can be scrambled by C-RNTI. DCI format 1_1 with CRC scrambled by C-RNTI can include at least some of the following information given in Table 14 below.

[0144] Table 14

[0145] [PDCCH: CORESET, REG, CCE, and Search Space]

[0146] The downlink control channel in a 5G communication system will be described in more detail below with reference to the accompanying drawings.

[0147] Figure 7 An example of a control resource set configuration (CORESET) for transmitting a downlink control channel in a 5G wireless communication system according to an embodiment of the present disclosure is shown.

[0148] Figure 7 An example is shown where the UE bandwidth portion 710 is configured along the frequency axis and two control resource sets (control resource set #1 701 and control resource set #2 702) are configured along the time axis within a time slot 720. Control resource sets 701 and 702 can be configured within a specific frequency resource 703 across the entire UE bandwidth portion 710 along the frequency axis. One or more OFDM symbols can be configured along the time axis, and this can be defined as the control resource set duration 704. Reference Figure 7 In the example shown, control resource set #1 701 is configured to have a control resource set duration corresponding to two symbols, and control resource set #2 702 is configured to have a control resource set duration corresponding to one symbol.

[0149] The base station can configure the aforementioned control resource set in 5G for the UE via upper-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). The description of configuring the control resource set for the UE means providing information such as the control resource set identifier, the frequency location of the control resource set, and the symbol duration of the control resource set. For example, the configuration information may include the following pieces of information given in Table 15: Table 15

[0150] In Table 15, the tci-StatesPDCCH (Transmission Configuration Indicator (TCI) status) configuration information may include information on one or more SS / PBCH block indices or Channel State Information Reference Signal (CSI-RS) indices, which are associated with the DMRS Quasi-Co-address (OCL) transmitted in the corresponding CORESET.

[0151] Figure 8 Examples of basic units of time and frequency resources constituting a downlink control channel available in 5G according to embodiments of the present disclosure are shown.

[0152] refer to Figure 8 The basic unit constituting the time and frequency resources of the control channel can be called a resource element group (REG) 803, and a REG 803 can be defined by an OFDM symbol 801 along the time axis and a physical resource block (PRB) 802 (i.e., 12 subcarriers) along the frequency axis. The base station can configure the downlink control channel allocation unit by cascading REG 803.

[0153] Assuming Figure 8 As shown, the basic unit for downlink control channel allocation in 5G is the Control Channel Element (CCE) 804, and one CCE 704 can include multiple REG 803s. To describe... Figure 8 The REG 803 shown, for example, may include 12 REs, and if a CCE 804 includes six REG 803s, then a CCE 804 may include 72 REs. Once configured, a downlink control resource set can include multiple CCE 804s, and based on the aggregation level (AL) in the control resource set, a specific downlink control channel can be mapped to one or more CCE 804s and then transmitted. The CCE 804s in the control resource set are distinguished by number, and the CCE 804 numbers can be assigned according to a logical mapping scheme.

[0154] Figure 8The basic unit of the downlink control channel shown (i.e., REG 803) can include both the RE mapped to by the DCI and the region mapped to by the reference signal (DMRS 805) used for decoding the RE. Figure 8 In this configuration, three DMRS 805s can be transmitted within a single REG 803. Depending on the aggregation level (AL), the number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16, and different numbers of CCEs can be used to achieve link adaptation for the downlink control channel. For example, with AL=L, one downlink control channel can be transmitted using L CCEs. The UE needs to detect signals without information about the downlink control channel, and therefore a search space indicating a set of CCEs has been defined for blind decoding. The search space is a set of downlink control channel candidates that the UE needs to attempt to decode at a given AL, and since 1, 2, 4, 8, or 16 CCEs can form a bundle at various ALs, the UE can have multiple search spaces. The search space set can be defined as a set of search spaces at all configured aggregation levels.

[0155] The search space can be categorized into a common search space and a UE-specific search space. A group of UEs or all UEs can search the common search space of the PDCCH to receive cell common control information, such as dynamic scheduling or paging messages regarding system information. For example, searching the common search space of the PDCCH can be used to receive PDSCH scheduling allocation information for transmitting SIBs, including cell operator information. In the case of a common search space, a group of UEs or all UEs need to receive the PDCCH, and therefore the common search space can be defined as a set of pre-defined CCEs. Searching the UE-specific search space of the PDCCH can be used to receive scheduling allocation information regarding UE-specific PDSCHs or PUSCHs. The UE-specific search space can be defined for a specific UE as a function of various system parameters and UE identifiers.

[0156] In 5G, the base station can configure parameters for the UE regarding the search space for PDCCH via upper-layer signaling (e.g., SIB, MIB, or RRC signaling). For example, the base station can configure the UE with parameters such as the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring timing for each symbol in the time slot of the search space, the search space type (common search space or UE-specific search space), the combination of RNTI and DCI formats to be monitored in the corresponding search space, and the control resource set index used to monitor the search space. For example, the configuration information may include the following items given in Table 16: Table 16

[0157] Based on the configuration information, the base station can configure one or more search space sets for the UE. According to some embodiments, the base station can configure search space set 1 and search space set 2 for the UE, and can configure DCI format A scrambled by X-RNTI to be monitored in the common search space of search space set 1, and DCI format B scrambled by Y-RNTI to be monitored in the UE-specific search space of search space set 2.

[0158] Depending on the configuration information, one or more search space sets may exist in the public search space or the UE-specific search space. For example, search space set #1 and search space set #2 can be configured as a public search space, and search space set #3 and search space set #4 can be configured as UE-specific search spaces.

[0159] The combinations of DCI format and RNTI given below can be monitored in the public search space. Obviously, the examples given below are not restrictive.

[0160] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, and SI-RNTI.

[0161] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0162] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0163] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI and TPC-PUCCH-RNTI

[0164] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0165] The combinations of DCI format and RNTI given below can be monitored within a specific search space of the UE. Obviously, the examples given below are not limiting.

[0166] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, and TC-RNTI.

[0167] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, and TC-RNTI.

[0168] The enumerated RNTIs can follow the definitions and uses given below: Cell-RNTI (C-RNTI): Used for scheduling UE-specific PDSCH Temporary Cell RNTI (TC-RNTI): Used for scheduling UE-specific PDSCH Configured Scheduling RNTI (CS-RNTI): Used to schedule UE-specific PDSCHs with semi-static configuration. Random Access RNTI (RA-RNTI): Used to schedule PDSCH during the random access step. Paging RNTI (P-RNTI): Used to schedule the PDSCH in which paging is sent. System Information RNTI (SI-RNTI): Used to schedule the PDSCH in which system information is sent. Interrupt RNTI (INT-RNTI): Used to indicate whether PDSCH has been pruned. Transmit power control of PUSCH RNTI (TPC-PUSCH-RNTI): Used to indicate power control commands regarding the PUSCH. Transmit power control of PUCCH RNTI (TPC-PUCCH-RNTI): Used to indicate power control commands regarding the PUCCH. Transmit power control of SRS RNTI (TPC-SRS-RNTI): Used to indicate power control commands regarding the SRS. The DCI formats listed above can be defined according to the definitions given in Table 17 below: Table 17

[0169] In 5G, the search space at the aggregation level L, which combines the control resource set p and the search space set s, can be represented by the following Equation 1:

[0170] ... Equation 1

[0171] - L Aggregation Level

[0172] - Carrier index

[0173] - Control resource set p The total number of CCEs existing in

[0174] - Time slot index

[0175] - Number of PDCCH candidates at aggregation level L

[0176] - =0, ..., -1: PDCCH candidate index at aggregation level L

[0177] - =0, ..., -1

[0178] - , , , , ,

[0179] - UE identifier

[0180] In the context of public search spaces, The value can correspond to 0.

[0181] This can correspond to a value that changes through the UE's identifier (C-RNTI or ID configured by the base station for the UE) and time index.

[0182] In a 5G system, multiple search space sets can be configured with different parameters (e.g., the parameters in Table 16), and the group of search space sets monitored by the UE at each time point can change accordingly. For example, if search space set #1 is configured periodically with X-time slots, and search space set #2 is configured periodically with Y-time slots, and if X and Y are different, the UE can monitor both search space set #1 and search space set #2 in a specific time slot, and can also monitor one of search space set #1 and search space set #2 in another specific time slot.

[0183] [PUSCH: Regarding the transmission scheme]

[0184] Next, the PUSCH transmission scheduling scheme will be described. PUSCH transmissions can be dynamically scheduled via UL authorization within the DCI, or operated using configured authorization type 1 or type 2. Dynamic scheduling instructions for PUSCH transmissions can be given via DCI format 0_0 or 0_1.

[0185] A PUSCH transport of license type 1 can be semi-statically configured by receiving the configuredGrantConfig in Table 18, which includes rrc-ConfiguredUplinkGrant, via upper-layer signaling, without receiving the UL license within the DCI. After receiving the configuredGrantConfig in Table 18, which does not include rrc-ConfiguredUplinkGrant, via upper-layer signaling, a PUSCH transport of license type 2 can be semi-persistently scheduled via the UL license within the DCI. If the PUSCH transport operates with the configured license, the parameters applied to the PUSCH transport are applied via the configuredGrantConfig in Table 18 (upper-layer signaling), except for the scaling of dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and UCI-OnPUSCH provided by pusch-Config in Table 19 (upper-layer signaling). If transformPrecoder is set in configuredGrantConfig (upper-layer signaling) in Table 18, the UE transmits tp-pi2BPSK in pusch-Config in Table 19 to the PUSCH that is configured to operate with permission.

[0186] Table 18

[0187] Next, the PUSCH transmission method will be described. The DMRS antenna port used for PUSCH transmission is the same as the antenna port used for SRS transmission. Depending on whether the value of txConfig in pusch-Config, which serves as upper-layer signaling, is "codebook" or "nonCodebook", PUSCH transmission can follow either a codebook-based transmission method or a non-codebook-based transmission method.

[0188] As described above, PUSCH transmissions can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured via configured permissions. Upon receiving a scheduling instruction for a PUSCH transmission via DCI format 0_0, the UE performs beam configuration for the PUSCH transmission using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the smallest ID within the active uplink BWP in the serving cell, and the PUSCH transmission is based on a single antenna port. The UE does not expect scheduling of PUSCH transmissions via DCI format 0_0 within a BWP that does not have a configured PUCCH resource including pucch-spatialRelationInfo. If the UE does not have a configured txConfig within pusch-Config in Table 30, the UE does not expect scheduling via DCI format 0_1.

[0189] Table 19

[0190] Next, codebook-based PUSCH transmission will be described. Codebook-based PUSCH transmission can be dynamically scheduled using DCI format 0_0 or 0_1, and can be operated semi-statically with configured permissions. If codebook-based PUSCH is dynamically scheduled using DCI format 0_1 ​​or semi-statically configured with configured permissions, the UE determines the precoder used for PUSCH transmission based on the SRS Resource Indicator (SRI), the Transport Precoding Matrix Indicator (TPMI), and the transport rank (the number of PUSCH transport layers).

[0191] The SRI can be given through the SRS resource indicator (a field within the DCI) or configured through the srs-ResourceIndicator (upper-layer signaling). During codebook-based PUSCH transmission, the UE has at least one configured SRS resource and can have a maximum of two configured SRS resources. If the SRI is provided to the UE through the DCI, the SRS resource indicated by the corresponding SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the corresponding SRI. Additionally, the TPMI and transport rank can be given through "precoding information and number of layers" (a field within the DCI) or configured through precodingAndNumberOfLayers (upper-layer signaling). The TPMI is used to indicate the precoder to be applied to the PUSCH transmission. If one SRS resource is configured for the UE, the TPMI can be used to indicate the precoder to be applied to the configured SRS resource. If multiple SRS resources are configured for the UE, the TPMI is used to indicate the precoder to be applied to the SRS resource indicated by the SRI.

[0192] The precoder to be used for PUSCH transmission is selected from the uplink codebook with the same number of antenna ports as the value of nrofSRS-Ports in the SRS-Config (upper-layer signaling). In conjunction with codebook-based PUSCH transmission, the UE determines the codebook subset based on the codebookSubset and TPMI in the push-Config (upper-layer signaling). Based on the UE capabilities reported by the UE to the base station, the codebookSubset in the push-Config (upper-layer signaling) can be configured as "fullAndPartialAndNonCoherent", "partialAndNonCoherent", or "nonCoherent". If the UE reports "partialAndNonCoherent" as a UE capability, the UE does not expect the value of codebookSubset (upper-layer signaling) to be configured as "fullAndPartialAndNonCoherent". Additionally, if the UE reports "nonCoherent" as a UE capability, the UE does not expect the value of codebookSubset (upper-layer signaling) to be configured as "fullAndPartialAndNonCoherent" or "partialAndNonCoherent". If nrofSRS-Ports in SRS-ResourceSet (upper-layer signaling) indicates two SRS antenna ports, the UE does not expect the value of codebookSubset (upper-layer signaling) to be configured as "partialAndNonCoherent".

[0193] A UE can have a configured SRS resource set, where the usage value in the SRS-ResourceSet (upper-layer signaling) is "codebook", and an SRS resource can be indicated by the SRI in the corresponding SRS resource set. If multiple SRS resources are configured in the SRS resource set, and the usage value in the SRS-ResourceSet (upper-layer signaling) is "codebook", then the UE expects the value of nrofSRS-Ports in the SRS-Resource (upper-layer signaling) to be the same for all SRS resources.

[0194] The UE sends one or more SRS resources, whose usage value is configured as a "codebook," to the base station according to upper-layer signaling. The base station selects one of the SRS resources sent by the UE and indicates that the UE can transmit PUSCH by using the transmission beam information of the corresponding SRS resource. In conjunction with codebook-based PUSCH transmission, the SRI is used as an index for selecting an SRS resource and is included in the DCI. Additionally, the base station adds rank and TPMI information to the DCI indicating the rank to be used by the UE for PUSCH transmission. Using the SRS resource indicated by the SRI, the UE applies a precoder indicated by the rank and TPMI of the corresponding SRS resource during PUSCH transmission.

[0195] Next, non-codebook-based PUSCH transmissions will be described. Non-codebook-based PUSCH transmissions can be dynamically scheduled using DCI format 0_0 or 0_1, and can also be operated semi-statically with configured permissions. If at least one SRS resource is configured in an SRS resource set where the usage value in the SRS-ResourceSet (upper-layer signaling) is "nonCodebook", non-codebook-based PUSCH transmissions can be scheduled for the UE using DCI format 0_1.

[0196] For SRS resource sets with a usage value of "nonCodebook" within the SRS-ResourceSet (upper-layer signaling), a connected NZP CSI-RS resource (non-zero power CSI-RS) can be configured for the UE. The UE can calculate the precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the non-periodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the non-periodic SRS transmission in the UE is less than 42 symbols, the UE does not expect the information about the precoder for SRS transmission to be updated.

[0197] If the resourceType configuration value in the SRS-ResourceSet (upper-layer signaling) is "aperiodic", the connected NZP CSI-RS is indicated by an SRS request, which is a field within DCI format 0_1 ​​or 1_1. If the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the connected NZP CSI-RS is indicated by the value of the SRS request (a field within DCI format 0_1 ​​or 1_1) not being "00". The corresponding DCI should not indicate cross-carrier or cross-BWP scheduling. Additionally, if the SRS request value indicates the presence of an NZP CSI-RS, the NZP CSI-RS is located in the time slot used to transmit the PDCCH including the SRS request field. In this case, the TCI state configured for the scheduled subcarrier is not configured as QCL-TypeD.

[0198] If a periodic or semi-persistent SRS resource set is configured, the associated CSI-RS within the SRS-ResourceSet (upper-layer signaling) can indicate the connected NZP CSI-RS. Regarding non-codebook-based transmissions, the UE does not expect the spatialRelationInfo (upper-layer signaling for SRS resources) and the associated CSI-RS within the SRS-ResourceSet (upper-layer signaling) to be configured together.

[0199] If multiple SRS resources are configured for the UE, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. The SRI can be indicated by an SRS resource indicator (a field within the DCI) or configured via the srs-ResourceIndicator (upper-layer signaling). Similar to the codebook-based PUSCH transmission described above, if the SRI is provided to the UE via the DCI, the SRS resource indicated by the corresponding SRI refers to the SRS resource corresponding to the SRI among those transmitted before the PDCCH containing the corresponding SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be transmitted simultaneously in the same symbol within an SRS resource set, as well as the maximum number of SRS resources, are determined by the UE's capabilities reported to the base station. SRS resources transmitted simultaneously by the UE occupy the same RB. The UE configures one SRS port for each SRS resource. There can be only one configured SRS resource set in which the usage value in the SRS-ResourceSet (upper-layer signaling) is "nonCodebook", and a maximum of four SRS resources can be configured for non-codebook-based PUSCH transmission.

[0200] The base station sends an NZP-CSI-RS connected to the SRS resource set to the UE, and the UE calculates the precoder to be used when sending one or more SRS resources within the corresponding SRS resource set based on the measurement results when receiving the corresponding NZP-CSI-RS. The UE applies the calculated precoder when sending one or more SRS resources within an SRS resource set where usage is configured as "nonCodebook", and the base station selects one or more SRS resources from the received one or more SRS resources. Combined with nonCodebook-based PUSCH transmission, the SRI indication can express an index of one or more SRS resources or a combination of SRS resources, and the SRI is included in the DCI. The number of SRS resources indicated by the SRI sent by the base station can be the number of transport layers of the PUSCH, and the UE sends the PUSCH by applying the precoder used for SRS resource transmission to each layer.

[0201] [PUSCH: Preparation time]

[0202] Next, the PUSCH preparation time will be described. If the base station schedules the UE to transmit PUSCH using DCI format 0_0, 0_1, or 0_2, the UE can request a PUSCH preparation time to transmit PUSCH by applying the transmission method indicated via DCI (SRS resource transmission precoding method, number of transport layers, spatial domain transmission filter). With this in mind, the PUSCH preparation time is defined in NR. The UE's PUSCH preparation time can be followed by Equation 2 given below.

[0203] T proc,2 =max(( N2+ d 2,1 + d2)( 2048 + 144 ) κ2 -μ T c + T ext + T switch , d 2,2 )

[0204] … Equation 2

[0205] The T described in Equation 2 above proc,2 Each parameter in the expression can have the following meanings.

[0206] -N2: The number of symbols determined based on UE processing capability 1 or 2 and parameter set μ. If UE processing capability 1 is reported based on UE capability report, N2 can have the value in Table 20, and if UE processing capability 2 is reported and the availability of UE processing capability 2 is configured via upper-layer signaling, N2 can have the value in Table 21.

[0207] Table 20

[0208] Table 21

[0209] -d 2,1 If all resource elements of the first OFDM symbol transmitted by PUSCH include DM-RS, the number of symbols is determined to be 0; otherwise, it is determined to be 1.

[0210] -κ:64

[0211] -μ: follow and In which T proc,2 A larger value. This refers to the set of parameters used to send the downlink PDCCH, which includes the DCI scheduling PUSCH, and... This refers to the set of parameters used for sending PUSCH in the uplink.

[0212] -T c :have .

[0213] -d 2,2 If the DCI of the scheduling PUSCH indicates a BWP switch, then the BWP switch time is followed; otherwise, it is 0.

[0214] -d2: If OFDM symbols overlap in time between a PUSCH with a high-priority index and a PUCCH with a low-priority index, then the d2 value of the PUSCH with the high-priority index is used. Otherwise, d2 is 0.

[0215] -T ext If the UE uses a shared spectrum channel access scheme, then the UE can calculate T. ext And apply it to the PUSCH preparation process time. Otherwise, assume T ext It is 0.

[0216] -T switch If the uplink handover interval has been triggered, then T will be... switch Assume it is the switching interval time. Otherwise, assume T. switch It is 0.

[0217] Given the timing advance between the uplink and downlink and the impact of the time-domain resource mapping information of the PUSCH scheduled via DCI, if the start time of the first symbol of the PUSCH is earlier than the first uplink symbol (where CP starts after Tproc,2 from the last symbol of the PDCCH containing the DCI scheduling the PUSCH), the base station and UE determine that the PUSCH preparation time is insufficient. Otherwise, the base station and UE determine that the PUSCH preparation time is sufficient. The UE can only send the PUSCH if the PUSCH preparation time is sufficient, and if the PUSCH preparation time is insufficient, the DCI scheduling the PUSCH can be ignored.

[0218] [PUSCH: Regarding duplicate transfers]

[0219] The following section describes in detail the repetition of uplink data channels in 5G systems. 5G systems support two types of uplink data channel repetition methods: PUSCH repetition type A and PUSCH repetition type B. One of PUSCH repetition type A or PUSCH repetition type B can be configured for the UE via upper-layer signaling.

[0220] 1. PUSCH repeat type A transmission (PUSCH repeat type A)

[0221] As described above, the symbol length and starting symbol position of the uplink data channel in a time slot can be determined by the time-domain resource allocation method, and the base station can notify the UE of the number of repeated transmissions through upper-layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0222] Based on the number of retransmissions received from the base station, the UE can repeatedly transmit an uplink data channel with the same length and start symbol as the configured uplink data channel in consecutive time slots. If the base station configures the time slot for the UE's downlink, or if at least one symbol of the uplink data channel configured for the UE is configured for downlink, the UE omits uplink data channel transmission but counts the number of retransmissions of the uplink data channel. That is, although included in the number of retransmissions of the uplink data channel, the uplink data channel may not be transmitted. Conversely, a UE supporting Rel-17 uplink data retransmission can determine the time slots capable of uplink data retransmission as available time slots and can count the number of transmissions during the retransmission of the uplink data channel in the time slot determined as available time slots. If uplink data channel retransmission is omitted in a time slot determined as "available time slot", the retransmission can be postponed and subsequently performed through a time slot available for transmission.

[0223] - To determine available time slots as described above, if at least one symbol configured for PUSCH via Time Domain Resource Allocation (TDRA) in a time slot used for PUSCH transmission overlaps with a symbol used for purposes other than uplink transmission (e.g., downlink transmission), the corresponding time slot is determined to be an unavailable time slot (e.g., a time slot other than available time slots determined to be unavailable for PUSCH transmission). Additionally, available time slots can be considered as resources for PUSCH transmission as well as uplink resources for determining PUSCH retransmissions and the transport block size (TBS) in multi-timeslot PUSCH transmissions including one TB (Transport Blocks on Multiple Time Slots (TBoMS)).

[0224] 2. PUSCH Repeat Type B Transmission (PUSCH Repeat Type B)

[0225] As mentioned above, the symbol length and starting symbol position of the uplink data channel in a time slot can be determined by the time-domain resource allocation method, and the base station can notify the UE of the number of repetitions through upper-layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0226] - Based on the previously configured start symbol and length of the uplink data channel, the nominal repetition of the uplink data channel is determined as follows. The time slot in which the nth nominal repetition begins is determined by... The symbol given, and the one that begins in that time slot, is... Given. The time slot that ends the nth nominal repetition is determined by... The symbol given, and which ends in that time slot, is... Given: n=0, ..., numberofrepetitions-1, S refers to the start symbol of the configured uplink data channel, and L refers to the symbol length of the configured uplink data channel. This refers to the time slot at which the PUSCH transmission begins, and This refers to the number of symbols per time slot.

[0227] - For PUSCH repeat type B transmissions, the UE may determine a specific OFDM symbol as an invalid symbol in the following cases.

[0228] Symbols configured for downlink via tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated can be identified as invalid symbols for PUSCH retransmission type B.

[0229] In order to receive SSB in unpaired spectrum (time division duplex (TDD) spectrum), the symbol indicated by ssb-PositionInBurst in SIB1 or ssb-PositionInBurst in ServingCellConfigCommon (upper-layer signaling) can be identified as an invalid symbol for PUSCH repeat type B transmission.

[0230] In order to transmit the control resource set associated with the Type 0-PDCCH CSS set in the unpaired spectrum (TDD spectrum), the symbols indicated by pdsch-ConfigSIB1 within the MIB can be identified as invalid symbols for PUSCH repeating type B transmission.

[0231] In unpaired spectrum (TDD spectrum), if numberOfInvalidSymbolsForDL-UL-Switching (upper-layer signaling) is configured, the same number of symbols as numberOfInvalidSymbolsForDL-UL-Switching in the symbols configured for downlink via tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated can be identified as invalid symbols.

[0232] Alternatively, invalid symbols can be configured in upper-layer parameters (e.g., `InvalidSymbolPattern`). Upper-layer parameters (e.g., `InvalidSymbolPattern`) can provide a symbol-level bitmap spanning one or two time slots, thereby configuring invalid symbols. In the bitmap, 1 represents an invalid symbol. Furthermore, the periodicity and mode of the bitmap can be configured through upper-layer parameters (e.g., `InvalidSymbolPattern`). If an upper-layer parameter (e.g., `InvalidSymbolPattern`) is configured, and if the parameter `InvalidSymbolPatternIndicator-ForDCIFormat0_1` or `InvalidSymbolPatternIndicator-ForDCIFormat0_2` indicates 1, the UE applies the invalid symbol mode; if the aforementioned parameter indicates 0, the UE does not apply the invalid symbol mode. If an upper-layer parameter (e.g., InvalidSymbolPattern) is configured, and if the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 is not configured, the UE applies the invalid symbol mode.

[0233] After invalid symbols are identified, for each nominal repetition, the UE may treat all symbols except the invalid symbols as valid symbols. If one or more valid symbols are included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Each actual repetition includes a set of consecutive valid symbols available for PUSCH repetition transmission type B in a time slot. If the OFDM symbol length of the nominal repetition is not 1, the UE may ignore the transmission of the actual repetition if the length of the actual repetition is 1.

[0234] Figure 10 A method for determining available time slots during PUSCH repetition type A in a 5G system by a UE according to embodiments of the present disclosure is illustrated.

[0235] When a base station configures uplink resources via higher-layer signaling (e.g., tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated) or L1 signaling (e.g., dynamic timeslot format indicator), the base station and the UE can determine the available timeslots for the configured uplink resources using the following two methods.

[0236] - A method for determining available time slots based on TDD configuration

[0237] - A method for determining available time slots considering TDD configuration, Time Domain Resource Allocation (TDRA), and configuration permission (CG) or DCI activation.

[0238] As an example of a method for determining available time slots based on TDD configuration, Figure 10 When the TDD configuration is configured as "DDFUU" via higher-layer signaling, the base station and UE can determine slots #3 and #4, configured for uplink "U" based on the TDD configuration, as available slots (1001). Slot #2 (1002), configured as flexible slot "F" based on the TDD configuration, can be determined as an unavailable or available slot, and can be predefined, for example, by the base station configuration.

[0239] As an example of a method for determining available time slots by considering TDD configuration, Time Domain Resource Allocation (TDRA), and configured permission (CG) or activated DCI, in Figure 10When the TDD configuration is set to "UUUUU" via higher-layer signaling, and when the start and length indication values ​​(SLIV) for PUSCH transmission are configured to {S:2, L:12 symbols} via L1 signaling, the base station and UE can determine that, for the configured uplink slot "U", slots #0, #1, #3, and #4 that satisfy the SLIV for PUSCH are available slots. The base station and UE can determine that slot #2 ("L=9" ≤ SLIV "L=12") that fails to satisfy the SLIV (TDRA condition for PUSCH transmission) is an unavailable slot (1003). This is just an example, and the scope is not limited to PUSCH transmission; it can also be applied to PUCCH transmission, PUSCH / PUCCH repetition, nominal repetition of PUSCH repetition type B, and TBoMS.

[0240] Figure 9 An example of PUSCH repetitive transmission type B in a wireless communication system according to an embodiment of the present disclosure is shown.

[0241] Figure 9 The diagram illustrates a scenario where, for nominal repetition, the UE receives the following configuration: the transmission start symbol S is 0, and the transmission symbol length L is 10, which can be represented by N1 to N10 in the accompanying figure (902). In this case, the UE can consider the slot format to determine invalid symbols (901) and thereby determine the actual repetition, which can be represented by A1 to A10 in the accompanying figure (903). In this regard, based on the invalid symbol and actual repetition determination scheme, PUSCH repetition type B transmission is not performed in symbols where the slot format is determined to be downlink (DL), and if a slot boundary exists within the nominal repetition, the actual repetition can be transmitted separately relative to the slot boundary. As an example, A1, referring to the first actual repetition, may include three OFDM symbols, and A2, which can be transmitted next, may include six OFDM symbols.

[0242] Additionally, regarding repeated PUSCH transmissions, NR version 16 allows for the definition of additional methods for UL-licensed and configuration-licensed PUSCH transmissions across time slot boundaries, as follows: - Method 1 (Mini-Slot-Level Repetition): Two or more PUSCH repetitions are scheduled within a slot or across consecutive slot boundaries, with a UL license. For Method 1, the time-domain resource allocation information within the DCI indicates the resources for the first repetition. Additionally, the time-domain resource information for the remaining repetitions can be determined based on the time-domain resource information of the first repetition and the uplink or downlink direction determined for each symbol in each slot. Each repetition occupies consecutive symbols.

[0243] --Method 2 (Multi-Segment Transmission): Two or more PUSCH repetition transmissions are scheduled in consecutive time slots with a single UL license. Transmission 1 is assigned to each time slot, and the start point or repetition length varies between transmissions. In Method 2, the time-domain resource allocation information within the DCI indicates the start point and repetition length for all repetition transmissions. When performing repetition transmissions within a single time slot using Method 2, if multiple consecutive uplink symbols exist in the corresponding time slot, the corresponding repetition transmission can be performed with respect to the respective uplink symbol bundle. If a single consecutive uplink symbol bundle exists in the corresponding time slot, PUSCH repetition transmissions are performed according to the method of NR Release 15.

[0244] - Method 3: Schedule two or more PUSCH repeating transmissions in consecutive time slots using two or more UL licenses. Transmission 1 can be specified for each time slot, and the nth UL license can be received before the PUSCH transmission scheduled by the (n-1)th UL license ends.

[0245] Method 4: One or more PUSCH retransmissions within a single time slot, or two or more PUSCH retransmissions across consecutive time slot boundaries, can be supported via a UL license or a configured license. The number of retransmissions indicated by the base station to the UE is only a nominal value, and the UE can actually perform more PUSCH retransmissions than the nominal number. The time-domain resource allocation information within the DCI or configured license refers to the resources for the first retransmission indicated by the base station. The time-domain resource information for the remaining retransmissions can be determined by referring to the resource information of the first retransmission and the uplink or downlink direction of the symbol. If the time-domain resource information for the retransmission indicated by the base station crosses a time slot boundary or includes an uplink / downlink switching point, the corresponding retransmission can be divided into multiple retransmissions. One retransmission can be included in a time slot for each uplink cycle.

[0246] [PUSCH: Frequency Hopping Process]

[0247] The frequency hopping of the Physical Uplink Shared Channel (PUSCH) in 5G systems will be described in detail below.

[0248] For each PUSCH repetition transmission type, 5G supports two PUSCH frequency hopping methods. First, in PUSCH repetition transmission type A, intra-slot frequency hopping and inter-slot frequency hopping are supported, and in PUSCH repetition transmission type B, inter-repetition frequency hopping and inter-slot frequency hopping are supported.

[0249] In-slot frequency hopping methods supported in PUSCH repetition type A transmissions may include a method in which the UE transmits the allocated frequency domain resources in two hops within a time slot after changing the allocated frequency domain resources according to a configured frequency offset. The starting RB of each hop associated with in-slot frequency hopping can be expressed by Equation 3 below.

[0250]

[0251] … Equation 3

[0252] In Equation 3, i=0 and i=1 can represent the first jump and the second jump, respectively, and RB start It can represent the starting RB in the UL BWP and can be calculated according to the frequency resource allocation method. RB offset This represents the frequency offset between two hops through the upper-level parameters. The number of symbols in the first hop can be determined by... This indicates that the number of symbols in the second hop can be determined by... express. It is the length of the PUSCH transmission in a time slot and is represented by the number of OFDM symbols.

[0253] Next, the inter-slot frequency hopping method supported in PUSCH repetition type A and type B transmissions is a method in which the UE transmits the allocated frequency domain resources in each time slot after changing the allocated frequency domain resources according to the configured frequency offset. The starting RB of the time slot period associated with inter-slot frequency hopping can be expressed by Equation 4 below.

[0254]

[0255] … Equation 4

[0256] In equation 4, This indicates the current slot number during a multi-slot PUSCH transmission, and RB start This represents the initial RB within the UL BWP and is calculated according to the frequency resource allocation method. RB offset This represents the frequency offset between two hops through the upper-level parameters.

[0257] The inter-repetition frequency hopping method supported in PUSCH repetitive transmission type B can be a method in which the allocated frequency domain resources for one or more actual repetitions in each nominal repetition are moved by a configured frequency offset and then transmitted. The index RBstart(n) of the starting RB in the frequency domain for one or more actual repetitions in the nth nominal repetition can follow Equation 5 given below.

[0258]

[0259] … Equation 5

[0260] In Equation 5, n represents the nominally repeating index, and RB offset This represents the RB offset between two hops using the upper-level parameters.

[0261] [PUSCH: Regarding transmission power]

[0262] The following section describes in detail a method for determining the transmission power of the uplink data channel in a 5G system.

[0263] In a 5G system, the transmission power of the uplink data channel can be determined using Equation 6, as follows:

[0264] … Equation 6

[0265] In equation 6, j This refers to the PUSCH license type. Specifically, j =0 indicates a PUSCH permission for the random access response. j =1 indicates the configured permission, and j {2, 3, ..., J-1} represents dynamic licensing. This refers to the timing of PUSCH transmission. i Regarding support for communities c carrier f The maximum output power configured for the UE. It is configured through high-level parameters. This can be determined through high-level configuration and SRI (in the case of dynamic licensing PUSCH). The parameters are configured by summing them up. This refers to the timing of PUSCH transmission. i The number of resource blocks expresses the bandwidth related to resource allocation. It is a value determined based on the modulation and coding scheme (MCS), the type of information transmitted by the PUSCH (e.g., whether it includes UL-SCH or CSI), etc. This is a value used to compensate for path loss, and it can be determined through higher-level configuration and the SRS Resource Indicator (SRI) (in the case of dynamically licensed PUSCH). This refers to the estimated downlink path loss value estimated by the UE using a reference signal, where the reference signal index is... qd And refer to the signal index qdIt can be determined by the UE through higher-level configuration and SRI (in the case of dynamic licensed PUSCH or configuration licensed PUSCH based on ConfiguredGrantConfig excluding ConfiguredUplinkGrant (higher-level signaling) (Type 2 configuration licensed PUSCH)) or through higher-level configuration. It is the closed-loop power adjustment value, and can be supported in both cumulative and absolute types. If the higher-layer parameter tpc-Accumulation is not configured for the UE, the closed-loop power adjustment value can be determined in the cumulative type. identified as It is used when sending PUSCH transmissions. i-i0 symbols KPUSCH(i-i0)-1 Timing for sending PUSCH transmissions i symbols KPUSCH(i) The timing of the previous PUSCH transmission received via DCI. i-i0 Closed-loop power adjustment value and related closed-loop index l The sum of the TPC command values. If the higher-layer parameter tpc-Accumulation is configured for the UE, then... It was identified as being received via DCI regarding the closed-loop index. l TPC command value If the higher-level parameter twoPUSCH-PC-AdjustmentStates is configured for the UE, then the closed-loop index... l It can be configured to 0 or 1, and its value can be determined by higher-level configuration and SRI (in the case of dynamic licensing PUSCH). The TPC value in DCI is based on either cumulative or absolute type. The mapping relationship between TPC command values ​​can be defined in Table 22 below: Table 22

[0266] [PDCCH: About TPMI]

[0267] Next, the Transport Precoding Matrix Indicator (TPMI), indicated by the base station via DCI, will be described during codebook-based PUSCH transmission.

[0268] If the base station configures the UE via DCI or higher-layer signaling to schedule Layer 1 transmissions for it using a single PUSCH antenna port, then TPMI can be defined as W=1. Otherwise, that is, if the base station configures the UE via DCI or higher-layer signaling to schedule Layer 1 or more PUSCHs for it using multiple PUSCH antenna ports, then TPMI (which is W) can be defined by the following tables 23 to 29: Table 23

[0269] Table 23 above describes the Layer 1 TPMI for a UE with two PUSCH antenna ports. In Table 23, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 and 1 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 5 and indicate it to the UE.

[0270] Table 24

[0271] Table 24 above describes the Layer 1 TPMI for a UE with four PUSCH antenna ports and when using transform precoding (i.e., using Discrete Fourier Transform Spread (DFTS)-OFDM waveforms). In Table 24, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 3 and indicate it to the UE. If the UE has a partially coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 11 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 27 and indicate it to the UE.

[0272] Table 25

[0273] Table 25 above describes the Layer 1 TPMI for a UE with four PUSCH antenna ports and without transform precoding (i.e., using CP-OFDM waveforms). In Table 25, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 3 and indicate it to the UE. If the UE has a partially coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 11 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 27 and indicate it to the UE.

[0274] Table 26

[0275] Table 26 above describes the two-layer TPMI in the case of a UE having two PUSCH antenna ports and in the case of not using transform precoding (i.e., using CP-OFDM waveforms). In Table 26, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select TPMI index 0 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 2 and indicate it to the UE.

[0276] Table 27

[0277] Table 27 above describes the two-layer TPMI with the UE having four PUSCH antenna ports and without transform precoding (i.e., using CP-OFDM waveforms). In Table 27, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 5 and indicate it to the UE. If the UE has a partially coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 13 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 21 and indicate it to the UE.

[0278] Table 28

[0279] Table 28 above describes the three-layer TPMI with the UE having four PUSCH antenna ports and without transform precoding (i.e., using CP-OFDM waveforms). In Table 28, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select TPMI index 0 and indicate it to the UE. If the UE has a partially coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 2 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 6 and indicate it to the UE.

[0280] Table 29

[0281] Table 29 above describes the 4-layer TPMI with the UE having four PUSCH antenna ports and without transform precoding (i.e., using CP-OFDM waveforms). In Table 29, if the UE has an incoherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select TPMI index 0 and indicate it to the UE. If the UE has a partially coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 2 and indicate it to the UE. If the UE has a fully coherent antenna configuration and has reported its corresponding UE capabilities to the base station, the base station can select one from TPMI indices 0 to 4 and indicate it to the UE.

[0282] [About SRS]

[0283] Next, an uplink channel estimation method using the UE's Sounding Reference Signal (SRS) transmission will be described. The base station can configure at least one SRS configuration for each uplink base station (BWP) to transmit configuration information for SRS transmission to the UE, and can also configure at least one SRS resource set for each SRS configuration. As an example, the base station and the UE can exchange upper-layer signaling information as follows to transmit information about the SRS resource set.

[0284] -srs-ResourceSetId: SRS resource set index

[0285] -srs-ResourceIdList: A set of SRS resource indexes referenced by the SRS resource set.

[0286] -resourceType: The time-domain transfer configuration of the SRS resource referenced by the SRS resource set, and can be configured as "Periodic," "Semi-persistent," or "Aperiodic." If configured as "Periodic" or "Semi-persistent," associated CSI-RS information can be provided based on the location where the SRS resource set is used. If configured as "Aperiodic," aperiodic SRS resource trigger list / slot offset information can be provided, and associated CSI-RS information can be provided based on the location where the SRS resource set is used.

[0287] -usage: Configuration regarding the usage location of SRS resources referenced by the SRS resource set, and can be configured as one of "beamManagement", "codebook", "nonCodebook", and "antennaSwitching".

[0288] -alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter configurations for adjusting the transmission power of SRS resources referenced by the SRS resource set.

[0289] The UE can understand that the SRS resources included in a set of SRS resource indices referenced by the SRS resource set follow the information configured for the SRS resource set.

[0290] Additionally, the base station and UE can send / receive upper-layer signaling information to transmit separate configuration information regarding SRS resources. As an example, separate configuration information regarding SRS resources may include time-frequency domain mapping information within time slots of the SRS resources, and this may include information regarding intra- or inter-time slot frequency hopping for the SRS resources. Separate configuration information regarding SRS resources may include the time-domain transmission configuration of the SRS resources and may be configured as "periodic," "semi-persistent," and "aperiodic." The time-domain transmission configuration of the SRS resources may be restricted to having the same time-domain transmission configuration as the set of SRS resources that includes the SRS resources. If the time-domain transmission configuration of the SRS resources is "periodic" or "semi-persistent," the time-domain transmission configuration may also include the SRS resource transmission period and time slot offset (e.g., periodicityAndOffset).

[0291] The base station can activate or deactivate SRS transmissions for the UE via upper-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 transmissions for the UE via upper-layer signaling. The base station can indicate the activation of an SRS resource set with a resourceType configured as "periodic" via upper-layer signaling, and the UE can transmit SRS resources referenced by the activated SRS resource set. The intra-slot time-frequency domain resource mapping of the transmitted SRS resources follows the resource mapping information configured for the SRS resources, and the slot mapping, including the transmission period and slot offset, follows the periodicityAndOffset configured for the SRS resources. Additionally, the spatial domain transmission filter applied to the transmitted SRS resources can refer to spatial relation information configured for the SRS resources, or it can refer to the associated CSI-RS configured for the SRS resource set including the SRS resources. The UE can transmit SRS resources within an uplink BWP activated with respect to periodic SRS resources activated via upper-layer signaling.

[0292] For example, a base station can activate or deactivate semi-persistent SRS transmission for a UE via upper-layer signaling. The base station can indicate the activation of an SRS resource set via MAC CE signaling, and the UE can transmit SRS resources referenced by the activated SRS resource set. The SRS resource set activated via MAC CE signaling can be restricted to an SRS resource set with a resourceType configured as "semi-persistent". The intra-slot time-frequency domain resource mapping of the transmitted SRS resources follows the resource mapping information configured for the SRS resources, and the slot mapping, including the transmission period and slot offset, follows periodicityAndOffset configured for the SRS resources. Additionally, the spatial domain transmission filter applied to the transmitted SRS resources can refer to spatial relation information configured for the SRS resources, or it can refer to the associated CSI-RS configured for the SRS resource set including the SRS resources. If the SRS resources have spatial relation information configured for them, this information can be disregarded, and the spatial domain transmission filter can be determined by referring to the configuration information of the spatial relation information transmitted via MAC CE signaling that activates semi-persistent SRS transmission. The UE can transmit SRS resources within the uplink BWP that is activated with respect to semi-persistent SRS resources activated via upper-layer signaling.

[0293] For example, a base station can trigger aperiodic SRS transmissions by a UE via a DCI. The base station can indicate one of the aperiodic SRS triggers (aperiodic SRS-ResourceTriggers) via the SRS request field of the DCI. The UE understands that the SRS resource set, including the aperiodic SRS resource trigger indicated by the DCI in the aperiodic SRS resource trigger list, has been triggered in the SRS resource set configuration information. The UE can then transmit the SRS resources referenced by the triggered SRS resource set. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured for the SRS resource. Furthermore, the time slot mapping of the transmitted SRS resource can be determined by the time slot offset between the SRS resource and the PDCCH including the DCI, and this can refer to values ​​included in the time slot offset set configured for the SRS resource set. Specifically, as the time slot offset between the SRS resource and the PDCCH including the DCI, the value indicated in the time domain resource allocation field of the DCI can be applied from the offset values ​​included in the time slot offset set configured for the SRS resource set. Additionally, the spatial domain transmission filter applied to the transmitted SRS resources can refer to spatial relationship information configured for the SRS resources, or it can refer to the associated CSI-RS configured for an SRS resource set including the SRS resources. The UE can transmit SRS resources within the uplink BWP regarding the activation of aperiodic SRS resources triggered by DCI.

[0294] If the base station triggers an aperiodic SRS transmission by the UE via DCI, a minimum time interval may be required between the transmitted SRS and the PDCCH containing the DCI that triggered the aperiodic SRS transmission, so that the UE can transmit the SRS by applying configuration information about the SRS resources. The time interval for the UE's SRS transmission can be defined as the number of symbols between the last symbol of the PDCCH containing the DCI that triggered the aperiodic SRS transmission and the first symbol of the earliest transmitted SRS resource mapped to the transmitted SRS resources. The minimum time interval can be determined with reference to the PUSCH preparation time required by the UE to prepare for PUSCH transmission. The minimum time interval can have different values ​​depending on the location where the set of SRS resources including the transmitted SRS resources is used. For example, with reference to the UE's PUSCH preparation time, the minimum time interval can be determined as N² symbols, taking into account the UE's processing capabilities. Additionally, if the location where the SRS resource set containing the transmitted SRS resources is used is configured as "codebook" or "antennaSwitching", the minimum time interval can be determined to be N² symbols. If the location is configured as "nonCodebook" or "beamManagement", the minimum time interval can be determined to be N²+14 symbols. If the time interval used for aperiodic SRS transmission is longer than or equal to the minimum time interval, the UE can transmit aperiodic SRS. If the time interval used for aperiodic SRS transmission is less than the minimum time interval, the DCI triggering aperiodic SRS can be ignored.

[0295] Table 30

[0296] Referring to a reference signal, the configuration information spatialRelationInfo in Table 30 above is applied to the beam used for SRS transmission corresponding to the beam information of the corresponding reference signal. For example, the configuration of spatialRelationInfo may include the information in Table 31 below.

[0297] Table 31

[0298] Referring to the spatialRelationInfo configuration above, the SS / PBCH block index, CSI-RS index, or SRS index can be configured as the index of the reference signal to be referenced, so as to use the beam information of a specific reference signal. The upper-layer signaling referenceSignal corresponds to the configuration information indicating which reference signal's beam information should be referenced for the corresponding SRS transmission. ssb-index refers to the SS / PBCH block index, csi-RS-index refers to the CSI-RS index, and srs refers to the SRS index. If the upper-layer signaling referenceSignal has a configuration value of "ssb-Index", the UE can use the receive beam used to receive the SS / PBCH block corresponding to ssb-Index as the transmit beam for the corresponding SRS transmission. If the upper-layer signaling referenceSignal has a configuration value of "csi-RS-Index", the UE can use the receive beam used to receive the CSI-RS corresponding to csi-RS-Index as the transmit beam for the corresponding SRS transmission. If the upper-layer signaling referenceSignal has a configuration value of "'srs", then the UE can use the receive beam used to transmit the SRS corresponding to srs as the transmit beam used for the corresponding SRS transmission.

[0299] [SRS: Comb Offset / Cyclic Shift Configuration Method]

[0300] Next, a method for configuring comb offset and cyclic shift by the UE during probe reference signal (SRS) transmission will be described.

[0301] The base station can configure SRS resources for the UE via SRS-Resource or SRS-PosResource (higher-layer signaling), and the SRS resource can be configured in the following details: - In the case of SRS-Resource, the number of antenna ports can be configured for the UE for each SRS resource, and its value can be defined as It can be configured via nrofSRS-Ports or nrofSRS-Ports-n8 (higher-layer signaling). If the usage (higher-layer signaling) in the SRS-ResourceSet is configured to a value other than nonCodebook, then It could refer to the first i The number of antenna ports, and i It can be 0 to An integer. If the usage (higher-level signaling) in the SRS-ResourceSet is configured as non-Codebook, then configuration can be performed for each SRS resource. The antenna port, and the ( ) in the SRS-ResourceSet i +1) antenna ports of SRS resources can be defined as In the case of SRS-PosResource, it can be defined .

[0302] - The base station can configure the number of consecutive symbols used to send SRS for the UE through nrofSymbols in resourceMapping (higher-layer signaling), and its value can be defined as .

[0303] - The base station can configure the position of the start symbol for transmitting SRS within a time slot for the UE through the startPosition in resourceMapping (higher-layer signaling), and its value can be defined as It can refer to the number of symbols in a time slot, and its value can be 14 in the case of a normal cyclic prefix, or 12 in the case of an extended cyclic prefix. This could refer to the offset value used to count the number of symbols backwards from the last symbol in the time slot. It can satisfy... .

[0304] - It can refer to the starting position of the frequency resources used to transmit SRS.

[0305] The SRS sequence generated from the SRS resources defined based on the above information can be defined as shown in Equation 7 below:

[0306] … Equation 7

[0307] in This refers to the length of the SRS sequence. This is determined through Table 33 below, and can also be determined through b-SRS and c-SRS (higher-layer signaling). With b-SRS configured, the values ​​in Table 33 below can be determined. Value, and can be determined The value of the subscript b. Without b-SRS configured, then... This is valid. c-SRS can determine the following in Table 33: value. This can be determined via FreqScalingFactor (higher-level signaling), and in the absence of the corresponding parameter configured, This is possible. With FreqScalingFactor (higher-layer signaling) configured, the UE can expect the SRS sequence length to be a multiple of 6.

[0308] Can be defined ,and The comb tooth size can be determined. The comb tooth size can represent the interval between REs used to transmit SRS in a frequency resource. As an example, if The comb size might mean that the interval between REs used to transmit SRS corresponds to two REs. The comb size can be configured for the UE via transmissionComb (higher-layer signaling). This can represent the symbol index in the symbols used to transmit SRS resources. The UE can use the following table 32 as a reference. The value determines the maximum cyclic shift value. : Table 32

[0309] It can be used to refer to the first i Cyclic shift of antenna port and basic sequence To define ,as follows: This can represent the length of the SRS sequence. Regarding a basic sequence, it can be determined based on different... and The value generates multiple SRS sequences.

[0310] Multiple basic sequences can be divided into groups, and the group index can be defined as follows: ,and This could refer to the index of the basic sequence within the group. If Each group can include a basic sequence, and It is possible. If Each group can then include two basic sequences, and It is possible. The definition can be based on The value (sequence length) varies.

[0311] When the length of the basic sequence is 36 or greater (i.e., In the case of ), the basic sequence It can be defined as follows. It can be less than The largest prime number.

[0312]

[0313] When the length of the basic sequence is 6, 12, 18, or 24 (i.e., In the case of ), the basic sequence It can be defined as follows: The values ​​can be defined using Tables 34 to 37 below.

[0314] With a basic sequence length of 30 (i.e., In the case of ), the basic sequence It can be defined as follows:

[0315] When the UE is configured with nrofSRS-Ports-n8 (higher-layer signaling) as ports8tdm, It can be defined as follows. Otherwise, it can be defined as follows. .

[0316] -exist and In this case, it can be defined .

[0317] -exist and In this case, it can be defined .

[0318] -In addition to the two cases mentioned above, it is possible to define .

[0319] Indicates the connection with the antenna port The corresponding cyclic shift can be defined as follows: It can be defined as follows: exist and In this case, it can be defined .

[0320] exist and ,or and In this case, Can be defined .

[0321] In addition to the two cases mentioned above, it is possible to define .

[0322] This is a parameter that determines the cyclic shift value and can be configured via yclicShift-n2, cyclicShift-n4, or cyclicShift-n8 in transmissionComb (higher-level signaling). This can be determined using Table 32 above.

[0323] and It can be defined as follows: When nrofSRS-Ports-n8 (higher-layer signaling) is configured as ports8tdm, it can be defined .exist In this case, It can be defined as And in In this case, it can be defined as In other words, when the UE transmits SRS resources configured with eight antenna ports of TDM type, it can transmit separately for each antenna port to be transmitted at the first symbol. Definitions of 1000, 1001, 1004, and 1005 1000, 1001, 1002, 1003, and can be respectively related to the antenna port to be transmitted at the second symbol. Definitions of 1002, 1003, 1006, and 1007 1000, 1001, 1002, 1003, so that when allocating resources to four different antenna ports for transmission at each symbol, the same resource allocation scheme with respect to the SRS resources configured by the four antenna ports can be applied to them.

[0324] - In addition to the above, that is, when nrofSRS-Ports-n8 (higher-layer signaling) is not configured as ports8tdm, it can be defined and .

[0325] It refers to the starting position of the SRS in the frequency domain corresponding to the i-th antenna port, and can be defined as follows: It can be defined as follows: It can be defined as follows: -exist , , In this case, it can be defined .

[0326] -exist , , In this case, it can be defined .

[0327] -exist , , In this case, it can be defined .

[0328] -exist , , In this case, it can be defined .

[0329] -exist , , , In this case, it can be defined .

[0330] -exist , , In this case, it can be defined .

[0331] -exist , , , In this case, it can be defined .

[0332] -In addition to the above cases, it can be defined .

[0333] It can be defined as follows: It can be defined as follows:

[0334] It can be configured via StartRBIndex (higher-layer signaling). If not configured, it can be defined. .

[0335] With EnableStartRBHopping (higher-layer signaling) configured, it can be done based on the following in Table 38. and Value to determine Otherwise, it can be defined. .

[0336] ,

[0337] If SRS transmission is performed based on SRS-PosResource, it can be defined based on Table 39. Otherwise (if SRS transport is performed based on SRS-Resource), it can be defined .

[0338] It is an offset value in the frequency domain, which determines the degree of offset between the SRS transmission position and the reference position in the frequency domain, and can be configured via freqDomainShift (higher-layer signaling). This represents the comb offset value and can be configured via combOffset-n2, combOffset-n4, or combOffset-n8 in transmissionComb (higher-level signaling).

[0339] b-hop can be configured in freqHoping as higher-layer signaling related to frequency hopping in SRS, and can be defined .

[0340] An index representing a frequency location, and can be defined as follows: -exist In this case, SRS frequency hopping is not supported. The index representing the frequency position is... In all Each symbol can have a predetermined value and can be defined as follows: The value is configured via freqDomainPosition (higher-level signaling), and can be 0 if not configured.

[0341] -exist In this case, SRS frequency hopping is supported, and It can be defined as follows: -exist In this case, it can be defined .

[0342] Otherwise, it can be defined .

[0343] exist If it is an even number, It can be defined as .exist In the case of an odd number, it can be defined as follows: It can be defined as 1, regardless of What is the value of ?

[0344] This can be defined as a parameter used to count the number of SRS transmissions. In the case of the UE transmitting aperiodic SRS resources, In a specific time slot Among the symbols, those that can be defined as When nrofSRS-Ports-n8 (higher-layer signaling) is configured as ports8tdm, It can be defined as And in other cases, it can be defined as It can be a value configured via repetitionFactor (higher-level signaling), and can also be defined if not configured. .

[0345] When the UE sends periodic or semi-persistent SRS resources, under the condition that... In the time slot, It can be defined as follows.

[0346]

[0347] in and This can refer to the period and slot offset of a periodic or semi-persistent SRS.

[0348] Figure 11 A method for allocating comb offset and cyclic shift during SRS transmission according to embodiments of the present disclosure is shown.

[0349] The first example 1100 can assume the following situation: where the SRS resources including four antenna ports are configured for the UE. (Comb tooth offset value) (Circular shift value) (comb tooth size value) and (Maximum cyclic shift value). In this case, the UE can... and Defined respectively as about The cyclic shift values ​​assigned to 1000 and 1002, and can be about 1000 and 1002 define all comb tooth offset values ​​as (1105). Additionally, the UE can... and Defined respectively as about The cyclic shift values ​​assigned to 1001 and 1003, and can be about 1001 and 1003 define all comb tooth offset values ​​as (1110). Therefore, in order to assign every two of the four antenna ports to the same comb offset and to separate the two antenna ports in the same comb offset, the interval between the cyclic shift values ​​corresponding to the two antenna ports can be determined as follows: This maximizes the interval.

[0350] The second example 1130 can assume the following situation: where the SRS resources including four antenna ports are configured for the UE. (Comb tooth offset value) (Circular shift value) (comb tooth size value) and (Maximum cyclic shift value). In this case, the UE can... , , and Defined respectively as about The cyclic shift values ​​assigned to 1000, 1001, 1002, and 1003, and can be related to 1000, 1001, 1002, and 1003 define all comb tooth offset values ​​as (1135). Therefore, in order to assign all four antenna ports to the same comb offset and separate the four antenna ports within the same comb offset, the interval between the cyclic shift values ​​corresponding to the four antenna ports can be determined as follows: This maximizes the interval.

[0351] The third example 1160 can assume the following situation: where the SRS resources including four antenna ports are configured for the UE. (Comb tooth offset value) (Circular shift value) (comb tooth size value) and (Maximum cyclic shift value). In this case, the UE can... and Defined respectively as about The cyclic shift values ​​assigned to 1000 and 1002, and can be about 1000 and 1023 define all comb tooth offset values ​​as (1165). Additionally, the UE can... and Defined respectively as about The cyclic shift values ​​assigned to 1001 and 1003, and can be about 1001 and 1003 define all comb tooth offset values ​​as (1170). Therefore, in order to assign every two of the four antenna ports to the same comb offset and to separate the two antenna ports in the same comb offset, the interval between the cyclic shift values ​​corresponding to the two antenna ports can be determined as follows: This maximizes the interval.

[0352] Table 33

[0353] Table 34

[0354] Table 35

[0355] Table 36

[0356] Table 37

[0357] Table 38

[0358] Table 39

[0359] [SRS: Antenna Switching]

[0360] The SRS used for antenna switching will be described below.

[0361] The base station can use the SRS transmitted from the UE to acquire DL channel state information (CSI) (e.g., DL CSI acquisition). As a specific example, in a time-division duplex (TDD) based single-cell or multi-cell (e.g., carrier aggregation (CA)) scenario, the base station (BS) can schedule SRS transmissions to the user equipment (UE) and then measure the SRS transmitted from the UE. In this case, the base station can assume reciprocity between the downlink (DL) and uplink (UL) channels, thereby treating the uplink channel information estimated based on the SRS transmitted from the UE as downlink channel information, and can perform downlink signal / channel scheduling for the UE using this information. The base station can configure the usage of the SRS used for downlink channel information acquisition for the UE as antenna switching.

[0362] As an example, when following specifications (e.g., 3GPP TS38.214), the usage of the SRS can be configured for the base station and / or UE using higher-level parameters (e.g., the usage of the RRC parameter SRS-ResourceSet). The configured usage of the SRS can be for beam management purposes, codebook transmission purposes, non-codebook transmission purposes, antenna switching purposes, etc.

[0363] When the base station configures the parameter "usage" in the SRS-ResourceSet (higher-layer signaling) for the UE to "antennaSwitching", the UE can receive at least one higher-layer signaling configuration from the base station based on the reported UE capabilities. The UE can report "supportedSRS-TxPortSwitch" as a UE capability, and its value can be as follows. In the following text, "mTnR" can indicate support for... m Each antenna transmits and through n The UE's ability to receive signals using multiple antennas.

[0364] - "t1r2": UE capability report value, indicating that the UE supports 1T2R operation.

[0365] - "t1r1-t1r2": UE capability report value, indicating that the UE supports 1T1R or 1T2R operation.

[0366] - "t2r4": UE capability report value, indicating that the UE supports 2T4R operation.

[0367] - "t1r4": UE capability report value, indicating that the UE supports 1T4R operation.

[0368] - "t1r6": UE capability report value, indicating that the UE supports 1T6R operation.

[0369] - "t1r8": UE capability report value, indicating that the UE supports 1T8R operation.

[0370] - "t2r6": UE capability report value, indicating that the UE supports 2T6R operation.

[0371] - "t2r8": UE capability report value, indicating that the UE supports 2T8R operation.

[0372] - "t4r8": UE capability report value, indicating that the UE supports 4T8R operation.

[0373] - "t1r1-t1r2-t1r4": UE capability report value, indicating that the UE supports 1T1R, 2T2R or 1T4R operation.

[0374] - "t1r4-t2r4": UE capability report value, indicating that the UE supports 1T4R or 2T4R operation.

[0375] - "t1r1-t1r2-t2r2-t2r4": UE capability report value, indicating that the UE supports 1T1R, 1T2R, 2T2R or 2T4R operation.

[0376] - "t1r1-t1r2-t2r2-t1r4-t2r4": UE capability report value, indicating that the UE supports 1T1R, 1T2R, 2T2R, 1T4R or 2T4R operation.

[0377] - "t1r1": UE capability report value, indicating that the UE supports 1T1R operation.

[0378] - "t2r2": UE capability report value, indicating that the UE supports 2T2R operation.

[0379] - "t1r1-t2r2": UE capability report value, indicating that the UE supports 1T1R or 2T2R operation.

[0380] - "t4r4": UE capability report value, indicating that the UE supports 4T4R operation.

[0381] - "t1r1-t2r2-t4r4": UE capability report value, indicating that the UE supports 1T1R, 2T2R, 2T2R or 4T4R operation.

[0382] Figure 12 An SRS antenna switching operation according to an embodiment of the present disclosure is illustrated.

[0383] Figure 12The diagram illustrates a scenario where a UE operates according to 1T4R and can have two aperiodic SRS resource sets (e.g., SRS resource sets #0 and #1) configured for it. The UE can receive a PDCCH (1200) from the base station and can be instructed via the PDCCH to perform aperiodic SRS triggering with respect to SRS resource set #0 1210 and SRS resource set #1 1220. The slot offset value associated with SRS resource set #0 1210 can be configured via slotOffset (higher-layer signaling), which can have a value of 1, and the aperiodic SRS transmission associated with SRS resource set #0 can be performed at a slot position one slot after the slot where the PDCCH has been received (i.e., in slot #1). Additionally, the slot offset value associated with SRS resource set #1 1220 can be configured via slotOffset (higher-layer signaling), which can be 2, and aperiodic SRS transmissions associated with SRS resource set #1 can be performed at two slot positions after the slot in which PDCCH has been received (i.e., in slot #2).

[0384] SRS resource #0 1211 and SRS resource #1 1212, included in SRS resource set #0 1210, are transmitted in time slot #1 at different OFDM symbol positions, and Y One OFDM symbol can exist as a guard interval between SRS resources #0 and #1 (1213). Additionally, during transmissions associated with SRS resource set #0 (1230), the UE can connect an SRS port to its first receive antenna port 1235, thereby performing SRS transmissions. During transmissions associated with SRS resource set #1 (1240), the UE can connect an SRS port to its second receive antenna port 1245, thereby performing SRS transmissions.

[0385] SRS resources #2 1221 and SRS resources #3 1222, included in SRS resource set #1 1220, are transmitted at different OFDM symbol locations in time slot #1, and Y One OFDM symbol can exist as a guard interval between SRS resources #2 and #3 (1223). Additionally, during transmissions associated with SRS resource set #2 (1250), the UE can connect an SRS port to its third receive antenna port 1255, thereby performing SRS transmissions. During transmissions associated with SRS resource set #3 (1260), the UE can connect an SRS port to its fourth receive antenna port 1265, thereby performing SRS transmissions.

[0386] By connecting the four SRS resources #0 to #3 to different receive antenna ports of the UE and then transmitting SRS, the UE can transmit SRS from all different receive antenna ports, making it possible to obtain information about the channels connected to all receive antennas of the UE. Thus, the base station can obtain information about the channel between the base station and the UE, and can use this information for uplink or downlink scheduling.

[0387] [About Uplink PTRS]

[0388] The higher-layer parameter phaseTrackingRS for PTRS can be configured for the UE on the higher-layer parameter DMRS-UplinkConfig. When sending PUSCH to the base station, the UE can send a phase tracking reference signal (PTRS) for phase tracking of the uplink channel. It can be determined whether transform precoding is performed during PUSCH transmission during the UE's transmission of UL PTRS. If transform precoding is performed and the transformPrecoderEnabled area is configured in the higher-layer parameter PTRS-UplinkConfig, the sampleDensity in the transformPrecoderEnabled area can indicate the sample density threshold represented by NRB0 to NRB4 in the table below. If transform precoding is performed and the transformPrecoderEnabled area is configured in the higher-layer parameter PTRS-UplinkConfig, the UE can determine the PT-RS group mode for the scheduled resource NRB according to Table 40. If transform precoding is also applied to PUSCH transmission, the number of bits in the PTRS-DMRS association area in DCI format 0_1 ​​or 0_2 indicating the association between PTRS and DMRS can be 0.

[0389] Table 40

[0390] Without applying transform precoding to PUSCH transmission and with the higher-layer parameter phaseTrackingRS configured for the UE, the frequencyDensity in the transformPrecoderDisabled region of the higher-layer parameter PTRS-UplinkConfig can indicate NRB0 to NRB1, and the timeDensity can indicate ptrs-MCS1 to ptrs-MCS3. The UE can determine the PT-RS density in the time domain (LPT-RS) and the PT-RS density in the frequency domain (KPT-RS) based on the MCS (lMCS) and RB (NRB) of the scheduled PUSCH, as described in Tables 41 and 42. In Table 41, ptrs-MCS4 is not specified as a higher-layer parameter, but the base station and the UE know it is 29 or 28 based on the configured MCS table.

[0391] Table 41

[0392] Table 42

[0393] Without applying transform precoding to PUSCH transmissions and with PTRS-UplinkConfig configured, the base station can indicate a two-bit "PTRS-DMRS association" area to the UE to indicate the association between PTRS and DMRS in DCI format 0_1 ​​or 0_2. The indicated two-bit PTRS-DMRS association area can be applied to Table 43 or 44 below, depending on the maximum port number of the PTR configured in the higher-layer parameter PTRS-UplinkConFig, maxNrofPorts. If the maximum PTRS port number is 1, the UE can determine the association between PTRS and DMRS using the two bits indicated by the PTRS-DMRS association area and Table 43, and can transmit PTRS according to the determined association. If the maximum PTRS port number is 2, the UE can determine the association between PTRS and DMRS using the two bits indicated by the PTRS-DMRS association area and Table 44, and can transmit PTRS according to the determined association.

[0394] Table 43

[0395] Table 44

[0396] The DMRS ports in Tables 43 and 44 can be determined by the tables determined by the higher-layer parameter configuration and by the “Antenna Port” region indicated by the same DCI as the DCI indicating the PTRS-DMRS association. If no transformation precoder is configured in the higher-layer configuration of the PUSCH, and if dmrs-Type is configured to 1 and maxLength is configured to 2 for DMRS, and if the rank of the PUSCH is 2, the UE can determine the DMRS port by the bits indicated by the antenna port region and a table regarding “Antenna Port” (such as Table 45). In the case of a non-codebook-based PUSCH, the UE can refer to the SRI region indicated by the same DCI as the DCI including the “Antenna Port” region to determine the rank value (i.e., the rank can be considered 1 if no SRI region exists). In the case of a codebook-based PUSCH, the UE can refer to the TPMI region indicated by the same DCI as the DCI including the “Antenna Port” region to determine the rank value. Table 45 is an example of the antenna port table referenced during the above PUSCH configuration. If PUSCH has been configured with different parameters, the DMRS port can be determined based on the bits of the antenna port region indicated by DCI and the antenna port table that follows the configuration.

[0397] Table 45

[0398] The first through fourth scheduled DMRSs in Table 43 can be defined as values ​​obtained by sequentially mapping bits in the antenna port region of the DCI and the DMRS ports indicated by the antenna port tables following higher-layer configurations. For example, if the bits in the antenna port region of the DCI are 0001, and the DMRS ports are determined by referring to Table 45 above, the scheduled DMRS ports can be 0 and 1, DMRS port 0 can be defined as the first scheduled DMRS, and DMRS port 1 can be defined as the second scheduled DMRS. Similarly, DMRS ports determined by bits in different antenna port regions and antenna port tables following different higher-layer configurations can be applied. The UE can refer to the bits in the DCI indicated by the PTRS-DMRS association to determine a DMRS port to be associated with from the DMRS ports defined above, and transmit PTRS according to the determined DMRS port.

[0399] In Table 44, the DMRS ports sharing TPRS port 0 and TPRS port 1 can be determined based on whether the PUSCH transmission is codebook-based or non-codebook-based. If the UE transmits PUSCH based on a partially coherent or non-coherent codebook, the uplink layer transmitted by PUSCH antenna ports 1000 and 1002 is associated with PTRS port 0, and the uplink layer transmitted by PUSCH antenna ports 1001 and 1003 is associated with PTRS port 1. To illustrate this in more detail, if layer 3: TPMI=2 has been selected for codebook-based PUSCH transmission, then layer 1 is transmitted by PUSCH antenna ports 1000 and 1002 and is therefore associated with PTRS port 0. Layer 2 is transmitted by PUSCH antenna port 1001, and layer 3 is transmitted by PUSH antenna port 1002, and therefore layers 2 and 3 are associated with PTRS port 1. These three layers refer to the corresponding DMRS ports. The DMRS ports for Layer 1 correspond to "the first DMRS port sharing PTRS port 0" in Table 44. The DMRS ports for Layer 2 correspond to "the first DMRS port sharing PTRS port 1" in Table 44. The DMRS ports for Layer 3 correspond to "the second DMRS port sharing PTRS port 1" in Table 44. Similarly, the DMRS ports associated with PTRS port 0 and PTRS port 1 can be determined based on different layer numbers and different TPMIs. If the UE transmits PUSCH based on a non-codebook, the DMRS ports associated with PTRS port 0 and PTRS port 1 can be distinguished based on the DCI and the SRI indicated by the antenna port. To illustrate this in more detail, whether SRS resources with usage "nonCodebook" included in the SRS resource set are associated with PTRS port 0 or PTRS port 1 is configured via the higher-layer parameter ptrs-PortIndex. The base station indicates the SRS resources used for transmitting non-codebook-based PUSCH via the SRI. Each indicated SRS resource port is mapped one-to-one to each PUSCH DMRS port. The association between the PUSCH DMRS port and the PTRS port is determined based on the higher-level parameter ptrs-PortIndex of the SRS resource mapped to the DMRS port. To illustrate this in more detail, assume that for SRS resources 1 through 4 in the SRS resource set that have usage “nonCodebook”, ptrs-PortIndex are configured as n0, n0, n1, and n1, respectively. It is also assumed that PUSCH transmissions through SRS resources 1, 2, and 4 are indicated by SRI, and DMRS ports 0, 1, and 2 are indicated by antenna port areas.The corresponding ports of SRS resources 1, 2, and 4 are mapped to DMRS ports 0, 1, and 2. Based on the ptrs-PortIndex in the SRS resources, DMRS ports 0 and 1 are associated with PTRS port 0, and DMRS port 2 is associated with PTRS port 1. Therefore, in Table 44, DMRS port 0 corresponds to "the first DMRS port sharing PTRS port 0", DMRS port 1 corresponds to "the second DMRS interface sharing PTRS port 0", and DMRS port 2 corresponds to "the first DMRS port sharing PTRS port 1". Similarly, the DMRS ports associated with PTRS port 0 and PTRS port 1 can be determined based on the ptrs-PortIndex configuration method in different SRS resources or different SRI values. The UE determines the association between the DMRS ports and PTRS ports as described above regarding the two PTRS ports. Subsequently, the UE refers to the MBS bit associated with PTRS-DMRS among the multiple DMRS ports associated with the corresponding PTRS port to determine the DMRS port to be associated with PTRS port 0, and refers to the LSB bit to determine the DMRS port to be associated with PTRS port 1, thereby transmitting PTRS.

[0400] [Regarding UE Capability Report]

[0401] In LTE and NR, the UE can perform the following procedure: upon connecting to a serving base station, the UE reports the capabilities it supports to the corresponding base station. In the following description, this procedure will be referred to as UE capability reporting.

[0402] According to an embodiment, a base station can transmit a UE capability query message to a UE in a connected state to request capability reports. This message may include UE capability requests for each Radio Access Technology (RAT) type of the base station. RAT type-specific requests may include information such as supported frequency band combinations. Furthermore, in the case of a UE capability query message, a single RRC message container sent by the base station can be used to request UE capabilities for multiple RAT types, or the base station may transmit a UE capability query message including multiple UE capability requests for a corresponding RAT type. That is, capability queries can be repeated multiple times in a single message, and the UE can configure corresponding UE capability information messages and report them multiple times.

[0403] According to embodiments, in next-generation mobile communication systems, UE capability requests can be made regarding NR, LTE, E-UTRA-NR dual connectivity (EN-DC), and multi-RAT dual connectivity (MR-DC). UE capability query messages are typically sent initially after the UE connects to the base station, but can also be requested by the base station under any circumstances if needed.

[0404] According to the embodiment, after receiving a UE capability report request from the base station, the UE can configure its capabilities based on the frequency band information and the RAT type requested by the base station. The following summarizes the methods for configuring UE capabilities in the NR system.

[0405] 1. If the UE receives a list of LTE and / or NR frequency bands from the base station upon requesting UE capabilities, the UE can construct frequency band combinations for EN-DC and NR Standalone (SA). In other words, the UE can configure a candidate list of BCs for EN-DC and NR SAs based on the frequency bands received from the base station via FreqBandList upon request. Furthermore, the frequency bands can have priorities in the order described in the FreqBandList.

[0406] 2. If the base station has already set the "eutra-nr-only" flag or the "eutra" flag and requests a UE capability report, the UE can remove all content related to NR SA BC from the configured BC candidate list. This operation can only occur if the LTE base station (eNB) requests "eutra" capability.

[0407] 3. Then, the UE can remove the back-off BC from the BC candidate list configured in the above steps. As used herein, a back-off BC can refer to a BC that can be obtained by removing the frequency band corresponding to at least one SCell from a specific BC, and since the BC before removing the frequency band corresponding to at least one SCell already covers the back-off BC, it can be omitted. This step also applies to MR-DC, i.e., LTE frequency bands also apply. The BCs remaining after the above steps constitute the final "candidate BC list".

[0408] 4. The UE can select a BC suitable for the requested RAT type from the final "Candidate BC List" and choose the BC to report. In this step, the UE can configure the supportedBandCombinationList in a predetermined order. That is, the UE configures the BCs to be reported and the UE capabilities according to the pre-configured rat-Type order (NR-> EUTRA-NR->EUTRA). Additionally, the UE can configure the featureSetCombination with respect to the configured supportedBandCombinationList and configure a list of "Candidate Feature Set Combinations" based on the candidate BC list from which fallback BCs (including capabilities of the same or lower steps) have been removed. The "Candidate Feature Set Combinations" can include all feature set combinations for NR and EUTRA-NR BCs and can be obtained from the feature set combinations of the containers for UE-NR-Capabilities and UE-MRDC-Capabilities.

[0409] 5. If the requested RAT type is eutra-nr and has an impact, featureSetCombinations can be included in both the UE-MRDC-Capabilities and UE-NR-Capabilities containers. However, the NR feature set can be included only in UE-NR-Capabilities.

[0410] According to an embodiment, after configuring UE capabilities, the UE can transmit a UE capability information message, including the UE capabilities, to the base station. The base station can then perform scheduling and transmit / receive management suitable for the UE based on the UE capabilities received from the UE.

[0411] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The content of this disclosure can be applied to frequency division duplex (FDD) and TDD systems. As used herein, upper-layer signaling (or higher-layer signaling) is a method for transmitting signals from a base station to a UE using a downlink data channel of the physical layer or from a UE to a base station using an uplink data channel of the physical layer, and may be referred to as “RRC signaling,” “PDCP signaling,” or “Media Access Control (MAC) control element (MACCE).”

[0412] In the following, within this disclosure, the UE may use various methods to determine whether cooperative communication is applied. For example, the PDCCH to which cooperative communication is applied has a specific format, or the PDCCH to which cooperative communication is applied includes a specific indicator indicating whether cooperative communication is to be applied, or the PDCCH to which cooperative communication is applied is scrambled by a specific RNTI, or it is assumed that the cooperative communication application is within a specific range indicated by an upper layer. In the following, for ease of description, it will be assumed that the NC-JT case refers to the case where the UE receives the PDSCH to which cooperative communication is applied based on conditions similar to those described above.

[0413] In the following text, determining the priority between A and B can be described differently, for example, by selecting the entity with higher priority and performing the corresponding operation according to a predetermined priority rule, or by omitting or discarding operations concerning the entity with lower priority.

[0414] The above examples can be described below through several embodiments, but these embodiments are not independent of each other, and one or more embodiments can be applied simultaneously or in combination.

[0415] In the following text, for ease of description, the cell, transmission point, panel, beam, and / or transmission direction, which can be distinguished by upper-layer / L1 parameters (such as TCI status or spatial relationship information, cell ID, TRP ID, or panel ID), can be collectively described as TRP, beam, or TCI status. Therefore, in practical applications, TRP, beam, or TCI status can be appropriately replaced by one of the aforementioned terms.

[0416] As used herein, the UE can use various methods to determine whether cooperative communication is applied. For example, the PDCCH to which cooperative communication is applied has a specific format, or the PDCCH to which cooperative communication is applied includes a specific indicator indicating whether cooperative communication is to be applied, or the PDCCH to which cooperative communication is applied is scrambled by a specific RNTI, or the cooperative communication application is assumed to be within a specific range indicated by the upper layer. In the following text, for ease of description, it will be assumed that the NC-JT case refers to the case where the UE receives the PDSCH to which cooperative communication is applied based on conditions similar to those described above.

[0417] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, a base station refers to an entity that allocates resources to terminals and can be at least one of a gNode B, gNB, eNode B, Node B, base station (BS), radio access unit, base station controller, or node on a network. A terminal may include a user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In the following description of embodiments of the present disclosure, 5G systems will be described by way of example, but embodiments of the present disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems may include LTE or LTE-A mobile communication systems and mobile communication technologies developed after 5G. Therefore, based on the judgment of those skilled in the art, embodiments of the present disclosure can be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure. The content of this disclosure can be applied to FDD and TDD systems.

[0418] Furthermore, in describing this disclosure, detailed descriptions of known functions or configurations incorporated herein will be omitted where it is determined that the description might unnecessarily obscure the subject matter of the disclosure. The terminology described below is defined in consideration of the functions in this disclosure and may vary depending on the user, the user's intent, or habits. Therefore, the definitions of terms should be determined based on the content throughout the specification.

[0419] In the following description of this disclosure, upper-layer signaling may refer to signaling corresponding to at least one of the following signaling, or a combination of one or more of them.

[0420] -Master Message Block (MIB)

[0421] -System Information Block (SIB) or SIB X (X=1, 2, ...)

[0422] - Radio Resource Control (RRC)

[0423] -Media Access Control (MAC) Control Element (CE)

[0424] Additionally, L1 signaling can refer to signaling corresponding to at least one of the signaling methods that use physical layer channels or signaling, or a combination of one or more of them.

[0425] -Physical Downlink Control Channel (PDCCH)

[0426] Downlink Control Information (DCI)

[0427] -UE-specific DCI

[0428] -Group Public DCI

[0429] -Public DCI

[0430] - Scheduling DCI (e.g., DCI used for scheduling downlink or uplink data).

[0431] - Non-scheduled DCI (e.g., DCI not used for the purpose of scheduling downlink or uplink data)

[0432] -Physical Uplink Control Channel (PUCCH)

[0433] -Uplink Control Information (UCI)

[0434] In the following text, determining the priority between A and B can be described differently, for example, by selecting the entity with higher priority and performing the corresponding operation according to a predetermined priority rule, or by omitting or discarding operations concerning the entity with lower priority.

[0435] As used herein, the term “slot” can generally refer to a specific time unit corresponding to a transmission time interval (TTI), specifically a slot used in a 5G NR system, or a slot or subframe used in a 4G LTE system.

[0436] The above examples can be described in several embodiments below, but these embodiments are not independent of each other, and one or more embodiments can be applied simultaneously or in combination.

[0437] <First Embodiment: Method for Supporting Codebook-Specific SRS for a UE with Three Transmit Antennas>

[0438] In embodiments of this disclosure, a method for supporting codebook-based SRS for a UE supporting three transmit antennas will be described. This embodiment can be operated in combination with at least one other embodiment described in this disclosure.

[0439] As described above, for codebook-based PUSCH transmission, a "codebook" can be configured for the UE via txConfig (higher-layer signaling). Additionally, the base station can configure an SRS resource set for the UE with a usage (higher-layer signaling) configured as a "codebook," and the UE can have up to two configured SRS resources in the configured SRS resource set. It can be configured such that UEs supporting three transmit antennas can transmit codebook-based PUSCH SRS resources following at least one combination of the following methods: [Method 1-1] According to embodiments of this disclosure, a UE can be configured with SRS resources configured by four antenna ports to perform codebook-based PUSCH transmissions via three antenna ports. More specifically, the UE may expect to configure up to two SRS resources configured by four antenna ports within a configured SRS resource set (whose usage is configured as a codebook). That is, the SRS resource set (whose usage is configured as a codebook) may include up to two SRS resources configured by four antenna ports. The UE may not perform transmissions with respect to one of the four antenna ports constituting the SRS resource. An antenna port not transmitted by the UE may be determined as the last antenna port (e.g., antenna port 1003) among the four antenna ports constituting the SRS resource (included therein). Alternatively, an antenna port not transmitted by the UE may be determined as the first antenna port (e.g., antenna port 1000) among the four antenna ports constituting the SRS resource (included therein). Alternatively, an antenna port not transmitted by the UE can be determined as any antenna port among the four antenna ports constituting the SRS resource (included therein) that can be defined by the specification (e.g., antenna port 1002 or any antenna port 1000 to 1003). Alternatively, an antenna port not transmitted by the UE can be determined as any antenna port among the four antenna ports constituting the SRS resource (included therein) determined according to notification from the base station (e.g., a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling) (e.g., the base station can determine through higher-layer signaling that antenna port 1002 will not be transmitted).

[0440] In the following description of this disclosure, the statement that the UE does not perform transmissions with respect to a specific antenna port related to SRS resources may mean that the UE does not perform SRS transmissions in that specific antenna port. Additionally, in this disclosure, the statement that the UE does not transmit to a specific antenna port related to SRS resources may mean that the UE does not perform SRS transmissions in that specific antenna port.

[0441] In the following description of the UE performing transmissions with respect to a specific antenna port related to SRS resources, it may mean that the UE performs SRS transmissions in that specific antenna port. Additionally, in this disclosure, the description of transmitting transmissions with respect to a specific antenna port related to SRS resources may mean that the UE performs SRS transmissions in that specific antenna port.

[0442] According to embodiments of this disclosure, when the UE does not perform transmissions regarding the last antenna port (e.g., antenna port 1003) for an SRS resource configured with four antenna ports, the UE can transmit SRS in the allocated time and frequency resources (SRS resources) by using only the comb offset and cyclic shift values ​​obtained by allocating the SRS sequence generated based on the SRS resources to antenna ports 1000, 1001, and 1002. The UE and base station can assume that the antenna port associated with the SRS transmitted by the UE is the same as the PUSCH antenna port that can be scheduled by the base station based on the SRS transmitted by the UE. Therefore, considering the three transmit antennas and the existence of three antenna ports (e.g., 1000, 1001, and 1002) for the PUSCH transmitted from the UE, from the perspective of a single UE and base station, not transmitting with respect to the last antenna port 1003 of the four antenna ports (not transmitting SRS in the last antenna port 1003) for an SRS resource with four antenna ports may be the simplest method, which maintains the connection / association between the SRS antenna ports and the PUSCH antenna ports. The connection / association between the SRS antenna port and the PUSCH antenna port may mean assuming that the antenna port associated with the SRS transmitted by the UE is the same as the PUSCH antenna port that can be scheduled by the base station based on the SRS transmitted by the UE. Maintaining the connection / association between the SRS antenna port and the PUSCH antenna port may mean that the port number of the antenna port constituting the SRS antenna port is the same as the port number of the antenna port constituting the PUSCH antenna port. For example, if the port numbers of the antenna ports constituting the SRS antenna port are 1000, 1001, and 1002, then the connection / association between the SRS antenna port and the PUSCH antenna port can be maintained if the port numbers of the antenna ports constituting the PUSCH antenna port are also 1000, 1001, and 1002. As another example, if the port numbers of the antenna ports constituting the SRS antenna port are 1001, 1002, and 1003, then if the port numbers of the antenna ports constituting the PUSCH antenna port are also 1000, 1001, and 1002, the connection / association between the SRS antenna port and the PUSCH antenna port may not be maintained. Furthermore, from the perspective of base station scheduling, failure to execute SRS transmissions for specific antenna ports in a fixed manner may reduce flexibility.

[0443] According to embodiments of this disclosure, when SRS resources configured with four antenna ports are not transmitted on any of the different antenna ports other than the last antenna port (i.e., when SRS is not transmitted on any of the four antenna ports constituting the SRS resource except for the last antenna port), the UE can reorder / renumber the remaining antenna ports (excluding the antenna port that did not perform transmission) to 1000, 1001, and 1002. As an example, when the UE does not transmit on the first antenna port (e.g., antenna port 1000), the UE can reorder / renumber the remaining antenna ports 1001, 1002, and 1003 to 1000, 1002, and 1002 respectively, generating an SRS sequence, and can transmit the SRS in the allocated time and frequency resources (SRS resources) using comb offset and cyclic shift values. As another example, if the UE does not perform a transmission in the second antenna port (e.g., antenna port 1001), the UE can reorder / renumber 1002 to 1001 and reorder / renumber 1003 to 1002 in the remaining antenna ports 1000, 1002, and 1003. As another example, if the UE does not perform a transmission in the third antenna port (e.g., antenna port 1002), the UE can reorder / renumber 1003 to 1002 in the remaining antenna ports 1000, 1001, and 1003. As another example, if the UE does not perform a transmission in the fourth antenna port (e.g., antenna port 1003), the UE may not perform a reorder / renumbering because the remaining antenna ports are 1000, 1001, and 1002. Re-adjusting the antenna port number can be a way to maintain the connection / association between the SRS and PUSCH antenna ports, but from the perspective of allocating resources from the base station to multiple UEs, it can achieve the same effect as the above method of not performing transmission in the last antenna port, and therefore, the scheduling flexibility of the base station may be reduced in a similar way to the above method.

[0444] According to embodiments of this disclosure, if the UE does not transmit different antenna ports other than the last antenna port for an SRS resource configured with four antenna ports, the UE may not need to renumber / reorder / re-number the remaining antenna ports (excluding the untransmitted antenna port) to 1000, 1001, and 1002. As an example, if the UE does not transmit the first antenna port (e.g., antenna port 1000), the UE may generate an SRS sequence based on the assumption that SRS is transmitted in the remaining antenna ports 1001, 1002, and 1003, and may perform transmission in the allocated time and frequency resources (SRS resources) using 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, and the assumption between the base station and the UE that the antenna ports for PUSCH and SRS are the same is invalid. This may require additional definitions regarding the connection / association between the PUSCH antenna ports and the SRS antenna ports. As an example, a connection can be defined between PUSCH antenna ports and SRS antenna ports such that they are associated one-to-one in ascending order, starting from the lowest antenna port number. That is, based on the additional connection, assuming a single connection between ports is (PUSCH antenna port <–> SRS antenna port), the entire additional connection can include individual associations between ports, such as (1000 <–> 1001), (1001 <–> 1002), and (1002 <–> 1003). According to embodiments of this disclosure, from the perspective of allocating resources from the base station to multiple UEs, antenna ports of different UEs can be flexibly allocated according to scheduling conditions.

[0445] The above [Method 1-1] can be applied not only to UEs with three transmit antennas, but also similarly to UEs with 5, 6, and 7 transmit antennas defining SRS resources to perform codebook-based PUSCH transmissions. As an example, in the case of UEs with 5, 6, and 7 transmit antennas, for SRS resources configured with eight antenna ports, the UE may not perform transmissions for three antenna ports, two antenna ports, and one antenna port, respectively. Regarding how to select three antenna ports, two antenna ports, and one antenna port, the above method of not transmitting one of the four antenna ports can be reused.

[0446] [Method 1-2]

[0447] According to embodiments of this disclosure, in order to perform codebook-based PUSCH transmission via three antenna ports, the UE can perform uplink channel estimation with respect to the three antenna ports using one SRS resource configured with one antenna port and one SRS resource configured with two antenna ports. That is, the UE can transmit SRS to the base station via the three antenna ports using one SRS resource configured with one antenna port and one SRS resource configured with two antenna ports, and the base station can perform uplink channel estimation using the SRS transmitted via the three antenna ports. The UE can consider that in a set of SRS resources with "codebook" usage, the SRS resource configured with one antenna port and the SRS resource configured with two antenna ports constitute an SRS resource group, and the UE can expect to configure up to two SRS resources, each SRS resource group including the SRS resource configured with one antenna port and the SRS resource configured with two antenna ports. As an example, if a UE is configured with a first SRS resource and a third SRS resource each configured for one antenna port, and a second SRS resource and a fourth SRS resource each configured for two antenna ports, the UE can consider the first SRS resource and the second SRS resource to constitute a first SRS resource group, and can use this first SRS resource group during channel estimation with respect to the three antenna ports. Similarly, the UE can consider the third SRS resource and the fourth SRS resource to constitute a second SRS resource group, and can use this second SRS resource group equivalently during channel estimation with respect to the three antenna ports.

[0448] The base station can indicate each SRS resource group to the UE instead of indicating SRS resources through the SRI field in the DCI. As an example, if the UE is configured with first to fourth SRS resources as described above, 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 UE can assume that the first and second code points in the SRI field indicate the first and second SRS resource groups, respectively.

[0449] [Methods 1-3]

[0450] According to embodiments of this disclosure, in order to perform codebook-based PUSCH transmission via three antenna ports, the UE can define an SRS resource configured with three antenna ports and perform uplink channel estimation with respect to the three antenna ports. That is, an SRS resource configured with three antenna ports can be defined / configured, an SRS can be transmitted to the base station via the three antenna ports on one SRS resource configured with three antenna ports, and the base station can perform uplink channel estimation using the SRS transmitted via the three antenna ports on one SRS resource. The three antenna ports that may be included in the SRS resource can be 1000, 1001, and 1002, respectively. The UE may expect to configure up to two SRS resources in a set of SRS resources with "codebook" usage, each SRS resource configured with three antenna ports. A comb offset value and a cyclic shift value can be configured for the UE, which can be commonly applied to the three antenna ports. For example, when a first SRS resource including three antenna ports and a second SRS resource including three antenna ports are configured, a first comb offset value and a first cyclic shift value can be configured with respect to the three antenna ports included in the first SRS resource, and a second comb offset value and a second cyclic shift value can be configured with respect to the three antenna ports included in the second SRS resource.

[0451] According to embodiments of this disclosure, when the comb tooth size is 2 (e.g., In other words, according to Table 32 above, In the case of ), the UE can determine the comb offset and cyclic shift values ​​of antenna ports 1000, 1001, and 1002 by using a combination of at least one of the following embodiments: -According to embodiments of this disclosure, in In this case, the UE can define It can be configured via higher-level signaling. In other words, the UE can distinguish between the three antenna ports 1000, 1001, and 1002 using different cyclic shift values, allowing it to transmit from the same RE location, thus ensuring excellent frequency resource allocation efficiency. Regarding... The cyclic shift value can be defined and used by the UE. It can be configured via higher-level signaling. This is the number of SRS antenna ports (=3), and For example, in In the case of 8, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 2, and 5, respectively. In the following, when calculating the cyclic shift interval between antenna ports, the tendency for the cyclic shift value to return to 0 if it has reached its maximum value can be used. More specifically, with a maximum cyclic shift value of 8, the cyclic shift values ​​can be 0, 1, 2, 3, 4, 5, 6, 7, and then return to 0. In this case, the cyclic shift interval between antenna ports 1000 and 1001 can be 2 (2 – 0 = 2), the cyclic shift interval between antenna ports 1001 and 1002 can be 3 (5 – 2 = 3), and the cyclic shift interval between antenna ports 1002 and 1000 can be 5 (8 – 5 = 3) (that is, when calculating the cyclic shift interval between antenna ports 1002 and 1000, the cyclic shift value for port 1000 is 0, but is assumed to be 8). Therefore, non-uniform cyclic shift intervals may occur, and thus the channel estimation performance may differ between antenna ports. In another approach, for the information about... The cyclic shift value can be defined and used by the UE. .exist In the case of 8, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 3, and 6. In the following, when calculating the cyclic shift interval between antenna ports, the tendency for the cyclic shift value to return to 0 if it has reached its maximum value can be used. More specifically, with a maximum cyclic shift value of 8, the cyclic shift values ​​can be 0, 1, 2, 3, 4, 5, 6, 7, and then return to 0. Similarly, in this case, the cyclic shift interval between antenna ports 1000 and 1001 can be 3, the cyclic shift interval between antenna ports 1001 and 1002 can be 3, and the cyclic shift interval between antenna ports 1002 and 1000 can be 2 (8 – 6 = 2) (that is, when calculating the cyclic shift interval between antenna ports 1002 and 1000, the cyclic shift value for port 1000 is 0, but assumed to be 8). Therefore, non-uniform cyclic shift intervals may occur, and thus the channel estimation performance between antenna ports may differ.

[0452] -According to embodiments of this disclosure, in In this case, the UE can define And in In this case, it can be defined In other words, the UE can distinguish antenna ports 1000 and 1002 by using different cyclic shift values ​​to transmit these antenna ports at the same RE location, and can transmit antenna port 1001 at different RE locations. Therefore, twice the frequency resources are used, but the cyclic shift interval between the two antenna ports allocated in the same RE can be maximized. Regarding... The cyclic shift value can be defined and used by the UE. As an example, in The cyclic shift values ​​with respect to antenna ports 1000 and 1002 at comb offset 0 can be 0 and 4 respectively, and the cyclic shift value with respect to antenna port 1001 at comb offset 1 can be 0. In this case, the cyclic shift interval between antenna ports 1000 and 1002 is 4, and no different cyclic shift value is assigned to antenna port 1001 without different SRS transmission allocations from the base station. Therefore, the channel estimation performance between antenna ports may be different. In addition, even if transmission is made at different comb offset positions, the interval between comb offsets is only one. Therefore, if the cyclic shift value with respect to antenna port 1000 at comb offset 0 and the cyclic shift value with respect to antenna port 1001 at comb offset 1 are both 0, it may be difficult to distinguish antenna ports during channel estimation. Therefore, when the UE will The cyclic shift value is defined as And in the case of use, and in The cyclic shift values ​​with respect to antenna ports 1000 and 1002 at the comb offset position 0 can be 0 and 4, respectively, and the cyclic shift value with respect to antenna port 1001 at the comb offset position 1 can be 8. Therefore, even if the difference in comb offsets is 1, by assigning cyclic shift values ​​at the corresponding comb offsets, antenna ports can be clearly distinguished during channel estimation so that they do not overlap.

[0453] When the comb teeth size is 4 (for example, In other words, according to Table 32 above, In the case of ), the UE can determine the comb offset values ​​of antenna ports 1000, 1001, and 1002 by using a combination of at least one of the following embodiments: -According to embodiments of this disclosure, in In this case, the UE can define It can be configured via higher-level signaling. In other words, the UE can distinguish between the three antenna ports 1000, 1001, and 1002 using different cyclic shift values, allowing it to transmit from the same RE location, thus ensuring excellent frequency resource allocation efficiency. Regarding... The cyclic shift value can be defined and used by the UE. It can be configured via higher-level signaling. As an example, in In the case of 12, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 4, and 8, respectively. In the following, when calculating the cyclic shift interval between antenna ports, the tendency for the cyclic shift value to return to 0 if it has reached its maximum value can be used. More specifically, with a maximum cyclic shift value of 12, the cyclic shift values ​​can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and then return to 0. In this case, the interval between any two of the three antenna ports can be equivalently 4 (that is, when calculating the cyclic shift interval between ports 1002 and 1000, the cyclic shift value for port 1000 is 0, but assumed to be 12), and the channel estimation performance between the antenna ports may be similar.

[0454] -According to embodiments of this disclosure, in In this case, the UE can define And in In this case, it can be defined In other words, the UE can distinguish antenna ports 1000 and 1002 by using different cyclic shift values ​​to transmit these antenna ports at the same RE location, and can transmit antenna port 1001 at different RE locations. Therefore, twice the frequency resources are used, but the cyclic shift interval between the two antenna ports allocated in the same RE can be maximized. Regarding... The cyclic shift value can be defined and used by the UE. As an example, in The cyclic shift values ​​with respect to antenna ports 1000 and 1002 at the comb offset 0 position can be 0 and 6, respectively, and the cyclic shift value with respect to antenna port 1001 at the comb offset 2 position can be 0. In this case, the cyclic shift interval between antenna ports 1000 and 1002 is 6, and without different SRS transmission allocations from the base station, no different cyclic shift value is assigned to antenna port 1001, and therefore the channel estimation performance between antenna ports may be different.

[0455] -According to embodiments of this disclosure, in In this case, the UE can define In other words, the UE utilizes RE resources by transmitting corresponding antenna ports at different comb offset positions, but does not allocate different antenna ports within the same RE. Therefore, the base station can perform appropriate cyclic shift allocation with respect to different SRS transmissions, thereby maximizing the cyclic shift interval. For regarding... The cyclic shift value can be defined and used by the UE. As an example, in Accordingly, the cyclic shift values ​​with respect to antenna ports 1000, 1001, and 1002 at comb offsets 0, 1, and 2 can all be 0. In this case, without different SRS transmission allocations from the base station, different cyclic shift values ​​are not assigned to antenna ports 1000, 1001, and 1002. Therefore, if the base station consistently performs different SRS transmission allocations with respect to the corresponding REs, the channel estimation performance between antenna ports may be similar. Furthermore, even if SRS is transmitted at different comb offset positions, the interval between comb offsets is only one. Therefore, if, as in the method described above, the cyclic shift values ​​with respect to antenna ports 1000, 1001, and 1002 at comb offsets 0, 1, and 2 are all equivalently 0, it may be difficult to distinguish antenna ports during channel estimation. Therefore, when the UE will... The cyclic shift value is defined as And in the case of use, and in Accordingly, 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. Therefore, even if the difference in comb offsets is 1, antenna ports can be clearly distinguished during channel estimation by assigning cyclic shift values ​​at the corresponding comb offsets, so that they do not overlap.

[0456] According to embodiments of this disclosure, when the comb tooth size is 8 (e.g., In other words, according to Table 32 above, In the case of ), the UE can determine the comb offset values ​​of antenna ports 1000, 1001, and 1002 by using a combination of at least one of the following embodiments: -According to embodiments of this disclosure, in In this case, the UE can define It can be configured via higher-level signaling. In other words, the UE can distinguish between the three antenna ports 1000, 1001, and 1002 using different cyclic shift values, allowing it to transmit from the same RE location, thus ensuring excellent frequency resource allocation efficiency. Regarding... The cyclic shift value can be defined and used by the UE. It can be configured via higher-level signaling. As an example, in In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 can be 0, 2, and 4, respectively. In this scenario, the spacing between any two of the three antenna ports can be equivalently set to 2, and therefore, the channel estimation performance across the antenna ports may be similar.

[0457] -According to embodiments of this disclosure, in In this case, the UE can define And in In this case, it can be defined In other words, the UE can distinguish antenna ports 1000 and 1002 by using different cyclic shift values ​​to transmit these antenna ports at the same RE location, and can transmit antenna port 1001 at different RE locations. Therefore, twice the frequency resources are used, but the cyclic shift interval between the two antenna ports allocated in the same RE can be maximized. Regarding... The cyclic shift value can be defined and used by the UE. As an example, in In this case, the cyclic shift values ​​with respect to antenna ports 1000 and 1002 at the comb offset 0 position can be 0 and 3, respectively, and the cyclic shift value with respect to antenna port 1001 at the comb offset 4 position can be 0. In this scenario, the cyclic shift interval between antenna ports 1000 and 1002 is 3, and no different cyclic shift value is assigned to antenna port 1001 without different SRS transmission allocations from the base station. Therefore, the channel estimation performance between antenna ports may differ.

[0458] -According to embodiments of this disclosure, in In this case, the UE can define In other words, the UE utilizes three times the RE resources by transmitting corresponding antenna ports at different comb offset positions, but does not allocate different antenna ports within the same RE. Therefore, the base station can perform appropriate cyclic shift allocation for different SRS transmissions, thereby maximizing the cyclic shift interval. For regarding... The cyclic shift value can be defined and used by the UE. As an example, in , In this case, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 at comb offsets 0, 2, and 4 can all be 0. In this case, without different SRS transmission allocations from the base station, different cyclic shift values ​​are not assigned to antenna ports 1000, 1001, and 1002. Therefore, if the base station consistently performs different SRS transmission allocations with respect to the corresponding REs, the channel estimation performance between antenna ports may be similar. Furthermore, even if SRS is transmitted at different comb offset positions, the interval between comb offsets is only two. Therefore, if, as in the method described above, the cyclic shift values ​​for antenna ports 1000, 1001, and 1002 at comb offsets 0, 1, and 2 are all equivalently 0, it may be difficult to distinguish antenna ports during channel estimation. Therefore, when the UE will... The cyclic shift value is defined as And in the case of use, and in In the case of [the specific case], the corresponding cyclic shift values ​​for antenna ports 1000, 1001, and 1002 at comb offsets of 0, 1, and 2 can be 0, 2, and 4, respectively. Therefore, even if the difference in comb offsets is 2, by assigning cyclic shift values ​​at the corresponding comb offsets, antenna ports can be clearly distinguished during channel estimation so that they do not overlap.

[0459] [Methods 1-4]

[0460] According to embodiments of this disclosure, in order to perform codebook-based PUSCH transmission via three antenna ports, the UE can define an SRS resource configured with three antenna ports and can perform uplink channel estimation with respect to the three antenna ports. That is, an SRS resource configured with three antenna ports can be defined / configured, an SRS can be transmitted to the base station via the three antenna ports on one SRS resource configured with three antenna ports, and the base station can perform uplink channel estimation by using the SRS transmitted via the three antenna ports on one SRS resource. The three antenna ports that may be included in the SRS resource can be 1000, 1001, and 1002, respectively. The UE may expect to configure up to two SRS resources in a set of SRS resources with "codebook" usage, each SRS resource configured with three antenna ports.

[0461] For each of the three antenna ports, multiple comb offset values ​​and cyclic shift values ​​can be configured for the UE. When two comb offset values ​​and two cyclic shift values ​​are configured for the UE, the UE can use the following method: by using a first comb offset value and a first cyclic shift value, the comb offset and cyclic shift are assigned to each antenna port in the SRS resource that can be configured by one antenna port, thereby applying the comb offset and cyclic shift values ​​to one of the three antennas (e.g., to antenna port 1001). Alternatively, the UE can use the following method: by using a second comb offset value and a second cyclic shift value, the comb offset and cyclic shift are assigned to each antenna port in the SRS resource that can be configured by two antenna ports, thereby applying the second comb offset value and the second cyclic shift value to two of the three antennas (e.g., to antenna ports 1000 and 1002).

[0462] When the UE is configured with three comb offset values ​​and three cyclic shift values, the UE can use the following method: by using a first comb offset value and a first cyclic shift value, the comb offset and cyclic shift are assigned to each antenna port in the SRS resource that can be configured by one antenna port, thereby applying the first comb offset value and the first cyclic shift value to one of the three antennas (e.g., to antenna port 1000). Alternatively, the UE can use the following method: by using a second comb offset value and a second cyclic shift value, the comb offset and cyclic shift are assigned to each antenna port in the SRS resource that can be configured by one antenna port, thereby applying the second comb offset value and the second cyclic shift value to one of the three antennas (e.g., to antenna port 1001). Alternatively, the UE can use the following method: by using a third comb offset value and a third cyclic shift value, the comb offset and cyclic shift are assigned to each antenna port in the SRS resource that can be configured by one antenna port, thereby applying the third comb offset value and the third cyclic shift value to one of the three antennas (e.g., to antenna port 1002).

[0463] The base station may notify the UE of at least one combination of [Method 1-1] to [Method 1-4] via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling, or the UE may expect to have a combination of at least one of [Method 1-1] to [Method 1-4] fixedly defined in the specification. Furthermore, the fact that the base station may notify the UE of a combination of one or more specific methods via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling may imply that the UE cannot support other combinations of one or more specific methods. As an example, the UE may expect to have [Method 1-1] fixedly defined in the specification, and the UE may assume that [Method 1-1] is used to configure SRS resources during codebook-based PUSCH transmissions through three antenna ports. As another example, the base station may notify the UE of [Method 1-4] via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the UE may consider that the base station has notified it that it does not support [Method 1-1].

[0464] The UE can report to the base station whether it supports at least one combination of [Method 1-1] to [Method 1-4] as a UE capability. If the UE has already reported to the base station that it can support one or more specific methods as a UE capability, it can be assumed that the UE has reported that it cannot support other combinations of one or more specific methods. For example, the UE can report to the base station whether it supports [Method 1-1]. As another example, the UE can report to the base station that it can support [Method 1-4], and such a UE capability report may imply that the UE cannot support [Method 1-1].

[0465] The UE can define the SRS resources for performing codebook-based PUSCH transmissions through the three antenna ports by taking into account the above [Method 1-1] to [Method 1-4]. The UE can calculate the transmission power for the SRS resources defined in this way (in order to perform codebook-based PUSCH transmissions through the three antenna ports), and then divide it (the calculated transmission power) by the total number of antenna ports (iii) to determine the transmission power for each antenna port.

[0466] As an example, if the UE defines the SRS resources for performing codebook-based PUSCH transmissions through three antenna ports based on the above [Method 1-1], and if, although the SRS resources are configured with four antenna ports, no transmission is performed with respect to one of the antenna ports (e.g., the last antenna port (port number 1003)), the UE can calculate the transmission power for the SRS resources and then divide it by 3 to determine the transmission power for each antenna port (e.g., determining the transmission power for each of the remaining port numbers 1000, 1001, and 1002 among the four antenna ports other than port number 1003, in the case that the last antenna port (port number 1003) is not used for transmission).

[0467] As another example, if the UE transmits one SRS resource configured with one antenna port and one SRS resource configured with two antenna ports based on the above [Method 1-2], enabling the base station to perform channel estimation for the three antenna ports through which the UE has already performed SRS resource transmission, the UE can first calculate the total transmission power for the two SRS resources, even though the two SRS resources are configured with one antenna port and two antenna ports respectively. Subsequently, the UE can allocate one-third of the total transmission power to the SRS resource configured with one antenna port, allocate two-thirds of the total transmission power to the SRS resource configured with two antenna ports, and allocate half of the transmission power allocated to the SRS resource configured with two antenna ports to each antenna port. That is, the UE can allocate the same transmission power to each of the three antenna ports on both SRS resources.

[0468] As another example, if the UE transmits SRS resources configured with three antenna ports based on the above [Methods 1-3] and [Methods 1-4], such that the base station can perform channel estimation for the three antenna ports through which the UE has performed SRS resource transmission, the UE can calculate the transmission power with respect to the RS resources transmitted by the UE, and then divide it (the calculated transmission power) by 3, thereby determining the transmission power with respect to each antenna port.

[0469] <Second Embodiment: Method for Defining Uplink Codebook for UEs Supporting Three Transmit Antennas>

[0470] A method for defining an uplink codebook for a UE supporting three transmit antennas, according to embodiments of the present disclosure, will be described. This embodiment can be operated in combination with at least one other embodiment described in the present disclosure.

[0471] A UE supporting three transmit antennas can report to the base station that it can use the three antenna ports for codebook-based PUSCH transmission as a UE capability. A UE can also report to the base station that only incoherent transmission is possible. For this codebook-based PUSCH transmission scheme, the base station can indicate the TPMI corresponding to the three antenna ports to the UE. With three transmit antennas, the UE can support incoherent codebooks. The incoherent coding matrices W used by the UE to transmit one-layer, two-layer, and three-layer PUSCH using the three antenna ports can be defined as shown in Tables 46, 47, and 48 below, respectively.

[0472] In Table 47 below, the base station can indicate to the UE a matrix in which the order of two columns of each of TPMI 0, 1, and 2 has been changed. As an example, the base station can indicate to the UE a matrix in Table 47 in which the order of two columns of TPMI 0 has been changed, such as... Apart from the matrix in which the order of the two columns of TPMI 0 has been changed, if the matrix in which the order of the two columns of TPMI 1 has been changed and the matrix in which the order of the two columns of TPMI 2 has been changed are included, then Table 47 below may include six matrices to which TPMI 0 to 5 have been assigned.

[0473] Similarly, in Table 48 below, the UE can also support matrices in which the order of the three columns of TPMI 0 is changed. As an example, the base station can indicate to the UE a matrix in which the positions of the three columns of TPMI 0 in Table 48 below are changed relative to each other, such as... The total number of ways in which three different columns can be arranged in different orders is 6 (3! = 3). 2 1 = 6), and Table 48 (which is the codebook for three-port three-layer transmission) may include six matrices to which TPMI 0 to 5 are assigned.

[0474] Table 46

[0475] Table 47

[0476] Table 48

[0477] A UE supporting three transmit antennas can receive DCI formats 0_1, 0_2, or 0_3 from a base station and can include TPMI fields (e.g., "Precoding Information and Layer Number" fields) in the DCI format. The UE can expect the TPMI fields to be configured as shown in Tables 49, 50, and 51 below.

[0478] As an example, if the UE has maxRank (higher-layer signaling) configured to 1 and has either configured (enabled) or not configured (disabled) a transformation precoder, the UE can assume that the TPMI field has a two-bit length, and each code point in the TPMI field can be defined / configured as shown in Table 49 below. In Table 49 below, code points 0, 1, and 2 can be interpreted as indicating TPMI indices 0, 1, and 2 (the precoding matrices corresponding to TPMI indices 0, 1, and 2) appearing in the second, third, and fourth columns of Table 46 above, respectively.

[0479] As an example, if the UE configures maxRank (higher-layer signaling) to 2 and does not configure a transformation precoder for it, the UE can assume that the TPMI field has a three-bit length, and each code point in the TPMI field can be defined / configured as shown in Table 50 below. In Table 50 below, code points 0, 1, and 2 can be interpreted as indicating TPMI indices 0, 1, and 2 (the precoding matrices corresponding to TPMI indices 0, 1, and 2) appearing in the second, third, and fourth columns of Table 46 above, respectively, and code points 3, 4, and 5 can be interpreted as indicating TPMI indices 0, 1, and 2 (the precoding matrices corresponding to TPMI indices 0, 1, and 2) appearing in the second, third, and fourth columns of Table 47 above, respectively.

[0480] As an example, if the UE configures maxRank (higher-layer signaling) to 3 and does not configure a transformation precoder for it, the UE can assume that the TPMI field has a three-bit length, and each code point in the TPMI field can be defined / configured as shown in Table 51 below. In Table 51 below, code points 0, 1, and 2 can be interpreted as indicating TPMI indices 0, 1, and 2 (corresponding precoding matrices) appearing in the second, third, and fourth columns of Table 46 above, respectively; code points 3, 4, and 5 can be interpreted as indicating TPMI indices 0, 1, and 2 (corresponding precoding matrices) appearing in the second, third, and fourth columns of Table 47 above, respectively; and code point 6 can be interpreted as indicating TPMI index 0 (corresponding precoding matrix) appearing in the second column of Table 48 above.

[0481] When the UE supports dynamic handover between DFTS-OFDM and CP-OFDM, and when the base station has configured higher-layer signaling for the UE regarding the presence of a dynamic handover field between DFTS-OFDM and CP-OFDM, if maxRank is 1, the UE can consider the TPMI field to have a two-bit length; and if maxRank is greater than 1, the UE can consider the TPMI field to have a three-bit length. When the UE has received DCI format 0_1, 0_2, or 0_3 indicating the presence of a dynamic handover field between DFTS-OFDM and CP-OFDM, and when the UE has received PUSCH scheduling information based on the DFTS-OFDM waveform through the dynamic handover field, the UE can interpret this as follows: among the eight code points that can be expressed with three bits, the first three code points correspond to code points 0, 1, and 2 in Table 49 below. When the UE has received PUSCH scheduling information based on the CP-OFDM waveform through the dynamic handover field, and when maxRank is 1, the UE can interpret this as follows: among the eight code points that can be expressed with three bits, the first three code points correspond to code points 0, 1, and 2 in Table 49 below. With a maxRank of 2, the UE can interpret this as follows: among the eight code points that can be represented by three bits, the first six code points correspond to code points 0 to 5 in Table 50 below. With a maxRank of 3, the UE can interpret this as follows: among the eight code points that can be represented by three bits, the first seven code points correspond to code points 0 to 7 in Table 51 below.

[0482] Table 49

[0483] Table 50

[0484] Table 51

[0485] When a UE has three transmit antennas, has received higher-layer signaling from the base station related to PUSCH transmissions corresponding to the three antenna ports, has been configured with two SRS resource sets, and the usage of these two SRS resource sets has been configured as codebook or non-codebook, the UE can expect the second TPMI field (e.g., the second precoding information field) to exist in DCI format 0_1, 0_2, or 0_3 (the UE can also expect the aforementioned TPMI field (e.g., the "precoding information and layer number" field) to also exist in DCI format 0_1, 0_2, or 0_3 received by the UE). The UE can expect the uplink layer number indicated by the TPMI field to be equal to the layer number of the TPMI indicated by the second TPMI field.

[0486] As an example, if the UE has maxRank (higher-layer signaling) configured to 1 and has configured or not configured a transformation precoder for it, the UE may assume that the second TPMI field has a two-bit length and that each code point of the second TPMI field can be defined / configured as shown in Table 49 above.

[0487] As an example, if the UE configures maxRank (higher-layer signaling) to 2 and does not configure a transformation precoder for it, the UE can assume that the second TPMI field has a two-bit length, and each code point of the second TPMI field can be defined / configured as shown in Table 52 below. If the layer number of the TPMI received through the TPMI field is 1, the second, third, and fourth rows of Table 52 below can correspond to code points 0, 1, and 2 of the second TPMI field, respectively, and this (code points 0, 1, and 2 of the second TPMI field correspond to the second, third, and fourth rows of Table 52 below) can be interpreted as indicating the TPMI indices 0, 1, and 2 that appear in the second, third, and fourth columns of Table 46 above (the precoding matrices corresponding to TPMI indices 0, 1, and 2). The UE can know the precoding matrix and layer values ​​through the TPMI field. Since the UE has already obtained the layer information through the TPMI field, information about the precoding matrix excluding layer information can be provided to the UE separately through the second TPMI field. In other words, since the UE can obtain layer information through the TPMI field, the UE does not need to obtain layer information through the second TPMI field. The above description can be applied equivalently / similarly to the following description. When the number of layers of the TPMI obtained through the TPMI field is 2, the fifth, sixth, and seventh rows of Table 52 below can correspond to code points 0, 1, and 2 of the second TPMI field, respectively, and this (code points 0, 1, and 2 of the second TPMI field correspond to the fifth, sixth, and seventh rows of Table 52 below, respectively) can be interpreted as indicating the TPMI indices 0, 1, and 2 that appear in the second, third, and fourth columns of Table 47 above (the precoding matrices corresponding to TPMI indices 0, 1, and 2).

[0488] As an example, if the UE configures maxRank (higher-layer signaling) to 3 and does not configure a transformation precoder for it, the UE can assume that the second TPMI field has a length of two bits, and each code point of the second TPMI field can be defined / configured as shown in Table 53 below. If the layer number of the TPMI received by the UE through the TPMI field is 1, the second, third, and fourth rows of Table 53 below can correspond to code points 0, 1, and 2 of the second TPMI field, respectively, and this (code points 0, 1, and 2 of the second TPMI field correspond to the second, third, and fourth rows of Table 53 below, respectively) can be interpreted as indicating the TPMI indices 0, 1, and 2 that appear in the second, third, and fourth columns of Table 46 above (the precoding matrices corresponding to TPMI indices 0, 1, and 2). When the TPMI layer number received by the UE through the TPMI field is 2, rows 5, 6, and 7 of Table 53 below can correspond to code points 0, 1, and 2 of the second TPMI field, respectively. This (code points 0, 1, and 2 of the second TPMI field corresponding to rows 5, 6, and 7 of Table 53 below) can be interpreted as indicating TPMI indices 0, 1, and 2 (the precoding matrices corresponding to TPMI indices 0, 1, and 2) appearing in columns 2, 3, and 4 of Table 47 above. When the TPMI layer number received by the UE through the TPMI field is 3, row 8 of Table 53 below can correspond to code point 0 of the second TPMI field. This (code point 0 of the second TPMI field corresponding to row 8 of Table 53 below) can be interpreted as indicating TPMI index 0 (the precoding matrix corresponding to TPMI index 0) appearing in column 2 of Table 48 above.

[0489] Table 52

[0490] Table 53

[0491] <Third Embodiment: Method for Supporting Non-Codebook SRS for UEs with Three Transmit Antennas>

[0492] In embodiments of this disclosure, a method for supporting non-codebook SRS for a UE supporting three transmit antennas will be described. This embodiment can be operated in combination with at least one other embodiment described in this disclosure.

[0493] According to embodiments of this disclosure, for non-codebook-based PUSCH transmission, the txConfig (higher-layer signaling) can be configured as "non-codebook" for a UE supporting three transmit antennas. Additionally, the base station can configure an SRS resource set (whose usage (higher-layer signaling) is configured as "non-codebook") for a UE supporting three transmit antennas, and can configure up to three SRS resources for the UE within the configured SRS resource set. Each SRS resource in the SRS resource set can be configured by one antenna port (including one antenna port).

[0494] According to embodiments of this disclosure, the UE can receive an SRI field from the base station, and the received SRI field can be... Bit configuration, and This can refer to the number of SRS resources configured in the SRS resource set, and can be up to three, as mentioned above.

[0495] If the UE has maxMIMO-Layers configured in PUSCH-ServingCellConfig (higher-layer signaling), It can follow the values ​​configured by maxMIMO-Layers. Otherwise, The maximum number of layers that can be applied during non-codebook PUSCH operations can be followed, as reported by the UE.

[0496] In addition to specifying 1, 2, and 4 as the maximum number of layers for uplink transmission, the UE may also report combinations of at least one of 3, 5, 6, 7, and 8. The UE may report the maximum number of layers that can be supported individually for codebook-based PUSCH transmissions and non-codebook-based PUSCH transmissions. That is, it may report information regarding the maximum number of layers supported for codebook-based PUSCH transmissions and information regarding the maximum number of layers supported for non-codebook-based PUSCH transmissions, respectively.

[0497] According to embodiments of this disclosure, when the reportQuantity in the CSI-ReportConfig (higher-layer signaling) is configured for the UE as one of cri-RSRP-Index, ssb-Index-RSRP-Index, cri-SINR-Index, and ssb-Index-SINR-Index, the UE can also report capabilityIndex in addition to L1-RSRP or L1-SINR reports. capabilityIndex can refer to the maximum number of SRS antenna ports supported by the UE, and the value of capabilityIndex can be associated with a specific panel of the UE (i.e., the association can be configured). By associating the value of capabilityIndex, which is reported along with the L1-RSRP or L1-SINR reports, with / associating them with specific panels of the UE, the base station can assume that the L1-RSRP or L1-SINR values ​​reported by the UE have been measured based on reference signals received by the specific panels of the UE. As an example, if a specific panel of the UE supports up to two SRS antenna ports, the UE reports the L1-RSRP received through the panel that supports up to two SRS antenna ports, and as described above, if the UE configures reportQuantity to cri-RSRP-Index, the UE can report a capabilityIndex value of 2.

[0498] According to embodiments of this disclosure, the UE can report UE capabilities regarding UE capability value reports to the base station. The UE capability report regarding UE capability value reports can be associated with candidate values ​​of capabilityIndex, which can be used as an indication of the maximum number of SRS antenna ports supported by the UE. That is, if {X, Y} has already been reported according to the UE capability value report, and if the UE reports capabilityIndex, capabilityIndex can be reported as a value of either X or Y. The UE can report up to four values ​​to the base station as UE capability reports regarding UE capability value reports, and each reported value can be selected as a different value from {1, 2, 4}. As an example, the UE can report three values ​​to the base station, and the reported values ​​can be 1, 2, and 4 respectively. As another example, the UE can report two values ​​to the base station, and the reported values ​​can be 2 and 4 respectively (or {1 and 2} or {1 and 4}). Additionally, UE capability reports regarding UE capability value reports can be reported for each frequency band. Specifically, the UE can report up to four values ​​to the base station as a UE capability report regarding the UE capability value report, but if each reported value can be selected as a different value in {1, 2, 4}, it can essentially report up to three different values. In this case, the UE capability (the ability to report up to four values) may not be fully utilized.

[0499] According to embodiments of this disclosure, when a UE supporting three transmit antennas reports its UE capabilities to a base station regarding UE capability value reports, the UE can use a method corresponding to a combination of at least one of the following embodiments: [Method 3-1] According to embodiments of this disclosure, when a UE supporting three transmit antennas reports its capabilities to a base station regarding a UE capability value report, it can report up to four values, and each reported value can be selected as a different value from {1, 2, 3}. As an example, the UE can report three values, 1, 2, and 3, to the base station, and after receiving a report from the UE including the three values ​​1, 2, and 3, the base station can expect that during the capabilityIndex reporting period, the UE will report one of the three values ​​using two bits. As an example, two bits of code "00" can correspond to 1, code "01" can correspond to 2, code "10" can correspond to 3, and code "11" can be reserved. The value 3 reported by the UE may mean that the maximum number of SRS ports for the UE is 3. When 3 is reported as the maximum number of SRS ports, a UE supporting three transmit antennas can use a method that does not transmit one of the antenna ports configured with four SRS resources (as in [Method 1-1] above) for SRS transmission, or can use SRS resources configured with one antenna port and SRS resources configured with two antenna ports together (as in [Method 1-2] above), or can use SRS resources configured with three antenna ports (as in [Method 1-3] and [Method 1-4] above), or can use a method based on a combination of at least one of [Method 1-1] to [Method 1-4] above.

[0500] [Method 3-2]

[0501] According to embodiments of this disclosure, when a UE supporting three transmit antennas reports its capabilities to a base station regarding a reported UE capability value, it can report up to four values, and each reported value can be selected as a different value from {1, 2, 4}. As an example, the UE can report three values, 1, 2, and 4, to the base station, and the base station can expect that during the capabilityIndex reporting period, the UE will report one of the three values ​​using two bits. As an example, two bits, code point "00", can correspond to 1, code point "01", code point "10", can correspond to 4, and code point "11" can be reserved. The value 4 reported by the UE may mean that the maximum number of SRS ports is 3. That is, even if the UE has reported 4, for a UE supporting three transmit antennas, the base station can consider the reported value 4 to be 3. This interpretation can be applied to situations where a UE supporting three transmit antennas specifically uses a method in which one of the antenna ports that does not transmit SRS resources configured by four SRS resources is not transmitted, as in [Method 1-1] above.

[0502] Additionally, when a UE supporting four transmit antennas reports its capabilities to the base station regarding the UE capability value report, it can report up to four values, and each reported value can be selected as a different value from {1, 2, 3, 4}. As an example, the UE can report four values ​​1, 2, 3, and 4 to the base station, and the base station can expect the UE to report one of the four values ​​using two bits during the capabilityIndex reporting period. For example, two bits of code "00" can correspond to 1, code "01" to 2, code "10" to 3, and code "11" to 4. A reported value of 4 by the UE might mean a maximum of 4 SRS ports, and a reported value of 3 by the UE might mean a maximum of 3 SRS ports.

[0503] Additionally, when a UE supporting four transmit antennas reports its capabilities to the base station regarding the reported UE capability value, it can report up to four values. Each reported value can be selected as a different value from {1, 2, 4}, and 4 can be reported up to twice. As an example, the UE can report four values: 1, 2, 4, and 4, and the base station can expect the UE to report one of the four values ​​using two bits during the capabilityIndex reporting period. For example, two bits of code point "00" can correspond to 1, code point "01" can correspond to 2, code point "10" can correspond to 4, and code point "11" can also correspond to 4. If the UE has already reported a code point mapped to 4, the value 4 mapped to a code point with a smaller value (i.e., "10") among the code points mapped to 4 might mean a maximum number of SRS ports of 3, and the value 4 mapped to a code point with a larger value might mean a maximum number of SRS ports of 4.

[0504] Additionally, when a UE supporting four transmit antennas reports its capabilities to the base station regarding UE capability value reports, it can report up to four values, and each reported value can be selected as a different value from {1, 2, 4}. As an example, the UE can report three values: 1, 2, and 4, and the base station can expect the UE to report one of the three values ​​using two bits during the capabilityIndex reporting period. For example, two bits of code "00" can correspond to 1, code "01" can correspond to 2, code "10" can correspond to 4, and code "11" can also correspond to 4. The value 4 reported by the UE may mean that the maximum number of SRS ports is 4. That is, a UE supporting four transmit antennas may not support the value 3 when reporting its capabilities regarding UE capability value reports, and a description that the UE does not support the value 3 when reporting its capabilities regarding UE capability value reports may mean that the UE does not perform SRS transmissions expressed by three antenna ports.

[0505] According to embodiments of this disclosure, when the UE has a maximum of eight transmit antennas, in addition to 1, 2, 3, and 4 described above, the UE may also report a combination of at least one of 5, 6, 7, and 8 during the UE capability value reporting period. When the candidate value is greater than 4, the capabilityindex value reported by the UE can be expressed by three bits.

[0506] According to embodiments of this disclosure, the UE can report the preferred number of reduced MIMO layers to the base station via reducedMIMO-LayersFR1-DL, reducedMIMO-LayersFR1-UL, reducedMIMO-LayersFR2-DL, reducedMIMO-LayersFR2-UL, reducedMIMO-LayersFR2-2-DL, or reducedMIMO-LayersFR2-2-UL in the UEAssistanceInformation (higher-layer signaling) that the UE can send, in order to address heat generation issues or reduce UE power consumption. When the UE has three transmit antennas, the UE can report one of the natural values ​​from 1 to 3 to the base station regarding reducedMIMO-LayersFR1-UL, reducedMIMO-LayersFR2-UL, or reducedMIMO-LayersFR2-2-UL. With three transmit antennas, the base station may not expect the UE to report a value of 4 to the base station via reducedMIMO-LayersFR1-UL, reducedMIMO-LayersFR2-UL, or reducedMIMO-LayersFR2-2-UL. With eight transmit antennas, the UE may report one of the natural values ​​from 1 to 8 to the base station regarding reducedMIMO-LayersFR1-UL, reducedMIMO-LayersFR2-UL, or reducedMIMO-LayersFR2-2-UL.

[0507] According to embodiments of this disclosure, a base station can notify a UE of a combination of at least one of [Method 3-1] and [Method 3-2] via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling, or the UE may expect to define a combination of at least one of [Method 3-1] and [Method 3-2] fixedly in the specification. Furthermore, the situation where a base station notifies a UE of a combination of one or more specific methods via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling may mean that the UE cannot support other combinations of one or more specific methods. As an example, the UE may expect to define [Method 3-1] fixedly in the specification, and the UE may assume that [Method 3-1] is used for UE capability value reporting. As another example, a base station can notify a UE of [Method 3-2] via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the UE may consider that the base station has notified that it does not support [Method 3-1].

[0508] According to embodiments of this disclosure, the UE can report to the base station whether it can support at least one combination of [Method 3-1] and [Method 3-2] as a UE capability. If the UE has already reported to the base station that it can support one or more specific methods as a UE capability, it can be assumed that the UE has reported that it cannot support other combinations of one or more specific methods. As an example, the UE can report to the base station whether it can support [Method 3-1]. As another example, the UE can report to the base station that it can support [Method 3-2], and such a UE capability report may imply that the UE cannot support [Method 3-1].

[0509] <Fourth Embodiment: Method for Supporting Antenna Switching Application SRS for a UE Supporting Three Transmit Antennas>

[0510] In embodiments of this disclosure, a method for supporting antenna switching purpose SRS for a UE supporting three transmit antennas will be described. This embodiment can be operated in combination with at least one other embodiment described in this disclosure.

[0511] When configuring SRS resource sets and SRS resources corresponding to 3T4R, 3T6R, and 3T8R, the UE can support the SRS resource set and SRS resources by using a combination of at least one of the following methods: [Method 4-1] According to embodiments of this disclosure, when an SRS resource set and SRS resources corresponding to 3T4R, 3T6R, and 3T8R are configured for the UE, the configuration may include SRS resources configured by the three antenna ports.

[0512] According to embodiments of this disclosure, for 3T4R, an SRS resource set can be configured / set for the UE. This SRS resource set includes a first SRS resource configured with three antenna ports and a second SRS resource configured with one antenna port. Therefore, the three antenna ports of the first SRS resource and the one antenna port of the second SRS resource can be connected to different antenna ports of the UE, enabling antenna switching, and the RF chain (which may be referred to as an RF module, TX chain, etc., and can be configured by a low-noise amplifier (LNA) / filter / power amplifier (PA), etc.) can be connected to a total of four receive antennas, enabling SRS transmission.

[0513] According to embodiments of this disclosure, for a 3T6R, a first SRS resource and a second SRS resource, each configured with three antenna ports, can be used to configure / set the SRS resource set for the UE. Therefore, the three antenna ports of the first SRS resource and the three antenna ports of the second SRS resource can be connected to different antenna ports of the UE to enable antenna switching, and the RF chain can be connected to a total of six receive antennas to enable SRS transmission.

[0514] According to embodiments of this disclosure, for a 3T8R system, a first SRS resource and a second SRS resource, each configured with three antenna ports, and a third SRS resource configured with two antenna ports can be used to configure / set the SRS resource set for the UE. Therefore, the three antenna ports of the first SRS resource, the three antenna ports of the second SRS resource, and the two antenna ports of the third SRS resource can be connected to different antenna ports of the UE to enable antenna switching, and the RF chain can be connected to a total of eight receive antennas to enable SRS transmission.

[0515] [Method 4-2]

[0516] According to embodiments of this disclosure, when an SRS resource set and SRS resources corresponding to 3T4R, 3T6R, and 3T8R are configured for a UE, the configuration may include SRS resources configured by one antenna port and SRS resources configured by two antenna ports.

[0517] According to embodiments of this disclosure, for 3T4R, an SRS resource set can be configured / set for the UE. This SRS resource set includes a first SRS resource and a second SRS resource each configured with one antenna port, and a third SRS resource configured with two antenna ports. Therefore, one antenna port of the first SRS resource, one antenna port of the second SRS resource, and two antenna ports of the third SRS resource can be connected to different antenna ports of the UE to enable antenna switching, and the RF chain can be connected to a total of four receive antennas to enable SRS transmission. One antenna port of the first SRS resource and two antenna ports of the third SRS resource can transmit at the same symbol using different comb offsets and cyclic shifts, or they can transmit at different symbols.

[0518] According to embodiments of this disclosure, for 3T6R, an SRS resource set can be configured / set for the UE. This SRS resource set includes a first SRS resource and a second SRS resource, each configured with one antenna port, and a third SRS resource and a fourth SRS resource, each configured with two antenna ports. Therefore, one antenna port of the first SRS resource, one antenna port of the second SRS resource, two antenna ports of the third SRS resource, and two antenna ports of the fourth SRS resource can be connected to different antenna ports of the UE, enabling antenna switching. Furthermore, the RF chain can be connected to a total of six receive antennas, enabling SRS transmission. One antenna port of the first SRS resource and two antenna ports of the third SRS resource can transmit at the same symbol using different comb offsets and cyclic shifts, or they can transmit at different symbols. Similarly, one antenna port of the second SRS resource and two antenna ports of the fourth SRS resource can transmit at the same symbol using different comb offsets and cyclic shifts, or they can transmit at different symbols.

[0519] According to embodiments of this disclosure, for a 3T8R system, an SRS resource set can be configured / set for the UE. This SRS resource set includes a first SRS resource and a second SRS resource each configured with one antenna port, and a third SRS resource, a fourth SRS resource, and a fifth SRS resource each configured with two antenna ports. Therefore, one antenna port of the first SRS resource, one antenna port of the second SRS resource, two antenna ports of the third SRS resource, two antenna ports of the fourth SRS resource, and two antenna ports of the fifth SRS resource can be connected to different antenna ports of the UE, enabling antenna switching. Furthermore, the RF chain can be connected to a total of eight receiving antennas, enabling SRS transmission. One antenna port of the first SRS resource and two antenna ports of the third SRS resource can transmit at the same symbol using different comb offsets and cyclic shifts, or they can transmit at different symbols. Similarly, one antenna port of the second SRS resource and two antenna ports of the fourth SRS resource can transmit at the same symbol using different comb offsets and cyclic shifts, or they can transmit at different symbols.

[0520] [Method 4-3]

[0521] According to embodiments of this disclosure, when the UE is configured with an SRS resource set and SRS resources corresponding to 3T4R, 3T6R, and 3T8R, the configuration may include SRS resources configured by two antenna ports.

[0522] According to embodiments of this disclosure, for 3T4R, an SRS resource set can be configured / set for the UE. This SRS resource set includes a first SRS resource and a second SRS resource, each configured with two antenna ports. Therefore, the two antenna ports of the first SRS resource and the two antenna ports of the second SRS resource can be connected to different antenna ports of the UE to enable antenna switching, and the RF chain can be connected to a total of four receive antennas to enable SRS transmission.

[0523] According to embodiments of this disclosure, for a 3T6R system, an SRS resource set can be configured / set for the UE. This SRS resource set includes a first SRS resource, a second SRS resource, and a third SRS resource, each configured on two antenna ports. Therefore, the two antenna ports of the first SRS resource, the two antenna ports of the second SRS resource, and the two antenna ports of the third SRS resource can be connected to different antenna ports of the UE to enable antenna switching, and the RF chain can be connected to a total of six receive antennas to enable SRS transmission.

[0524] According to embodiments of this disclosure, for a 3T8R system, an SRS resource set can be configured for the UE. This SRS resource set includes a first SRS resource, a second SRS resource, a third SRS resource, and a fourth SRS resource, each configured on two antenna ports. Therefore, the two antenna ports of the first SRS resource, the two antenna ports of the second SRS resource, the two antenna ports of the third SRS resource, and the two antenna ports of the fourth SRS resource can be connected to different antenna ports of the UE, enabling antenna switching. Furthermore, the RF chain can be connected to a total of eight receive antennas, enabling SRS transmission.

[0525] According to embodiments of this disclosure, the base station can notify the UE of at least one combination of [Method 4-1] to [Method 4-3] via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling, or the UE may expect to define a combination of at least one of [Method 1-1] to [Method 1-5] fixedly in the specification. Furthermore, the fact that the base station notifies the UE of a combination of one or more specific methods via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling may mean that the UE cannot support other combinations of one or more specific methods. As an example, the UE may expect to define [Method 4-1] fixedly in the specification, and the UE may assume that [Method 4-1] is used when configuring SRS resource sets and SRS resources to support 3T4R, 3T6R, and 3T8R. As another example, the base station can notify the UE of [Method 4-3] via a combination of at least one of higher-layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the UE may consider that the base station has notified that it does not support [Method 4-1].

[0526] According to embodiments of this disclosure, the UE can report to the base station whether it can support at least one combination of [method 4-1] to [method 4-3] as a UE capability. If the UE has already reported to the base station that it can support one or more specific methods as a UE capability, it can be assumed that the UE has reported that it cannot support other combinations of one or more specific methods. As an example, the UE can report to the base station whether it can support [method 4-1]. As another example, the UE can report to the base station that it can support [method 4-3], and such a UE capability report may imply that the UE cannot support [method 1-1].

[0527] Figure 13 Operation of a UE according to an embodiment of this disclosure is illustrated.

[0528] In operation 1300, the UE can transmit UE capabilities to the base station. The UE capabilities that can be reported may include uplink transmission functions for a UE supporting three transmit antennas as defined in the first to fourth embodiments, methods for supporting codebook-purpose SRS for a UE supporting three transmit antennas, uplink codebook definition methods, non-codebook-purpose SRS support methods, and antenna-switching-purpose SRS support methods, and may be related to [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], and [Methods 4-1] to [Methods 4-3] described above. Operation 1300 may be omitted.

[0529] In operation 1305, the UE can receive higher-layer signaling from the base station based on the reported UE capabilities. The UE can define and use higher-layer signaling from the base station relating to at least one combination of the above-described [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], [Methods 4-1] to [Methods 4-3] (including the method defined in the first to fourth embodiments for supporting codebook-purpose SRS for UEs supporting three transmit antennas, the uplink codebook definition method, the non-codebook-purpose SRS support method, and the antenna-switching-purpose SRS support method).

[0530] In operation 1310, the UE can send an SRS to the base station. The UE can send an SRS to the base station based on the above-described [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], [Methods 4-1] to [Methods 4-3] (including the methods defined in the first to fourth embodiments for supporting codebook-purpose SRS for UEs supporting three transmit antennas, uplink codebook definition methods, non-codebook-purpose SRS support methods, and antenna-switching-purpose SRS support methods), wherein the purpose of the SRS is configured as codebook, non-codebook, or antenna-switching.

[0531] In operation 1315, the UE can receive PUSCH transmission scheduling from the base station and can perform PUSCH transmission based on the methods mentioned in the first to third embodiments (e.g., combinations of at least one of [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], [Methods 4-1] to [Methods 4-3] above). Alternatively, the UE can receive SRS for antenna switching, thereby receiving PDSCH scheduling information from the base station that has already acquired downlink channel information and downlink precoding information, and can receive the corresponding PDSCH. Alternatively, based on the reference signal received from the base station, the UE can report L1-RSRP or L1-SINR together with the capabilityIndex based on the methods mentioned in the third embodiment (e.g., combinations of at least one of [Methods 3-1] and [Methods 3-2] above).

[0532] The flowchart above illustrates a method that can be implemented according to the principles of this disclosure, and various modifications can be made to the method shown in the flowchart of the specification. For example, although shown as a series of steps, the individual steps in the corresponding figures may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, a step may be omitted or replaced with another step.

[0533] Figure 14 The operation of a base station according to an embodiment of the present disclosure is illustrated.

[0534] In operation 1400, the base station can receive UE capabilities from the UE. Reportable UE capabilities may include uplink transmission functions for a UE supporting three transmit antennas as defined in the first to fourth embodiments, methods for supporting codebook-purpose SRS for a UE supporting three transmit antennas, uplink codebook definition methods, non-codebook-purpose SRS support methods, and antenna-switching-purpose SRS support methods, and may be related to [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], and [Methods 4-1] to [Methods 4-3] described above. Operation 1400 may be omitted.

[0535] In operation 1405, the base station can send higher-layer signaling to the UE based on the UE capabilities reported by the UE. The base station can define higher-layer signaling for combinations of at least one of the higher-layer signaling related to [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], [Methods 4-1] to [Methods 4-3] (including the method defined in the first to fourth embodiments for supporting codebook-purpose SRS for UEs supporting three transmit antennas, uplink codebook definition method, non-codebook-purpose SRS support method, and antenna-switching-purpose SRS support method), and can configure the defined higher-layer signaling for the UE.

[0536] In operation 1410, the base station can receive SRS from the UE. Based on the above [Methods 1-1] to [Methods 1-4], [Methods 3-1] and [Methods 3-2], [Methods 4-1] to [Methods 4-3] (including the method for supporting codebook-purpose SRS for UEs supporting three transmit antennas, uplink codebook definition method, non-codebook-purpose SRS support method, and antenna-switching-purpose SRS support method defined in the first to fourth embodiments), the base station can receive SRS from the UE based on the purpose of the SRS for the UE being configured as codebook, non-codebook, or antenna-switching.

[0537] In operation 1415, the base station may transmit PUSCH transmission scheduling to the UE and may notify the UE to perform PUSCH transmission based on the methods mentioned in the first to third embodiments (e.g., combinations of at least one of [Method 1-1] to [Method 1-4], [Method 3-1] and [Method 3-2], [Method 4-1] to [Method 4-3] above). Alternatively, the base station may receive SRS for antenna switching, acquire downlink channel information and downlink precoding information, transmit PDSCH scheduling information to the UE, and send the corresponding PDSCH. Alternatively, based on the reference signal sent to the UE, the base station may receive a report of L1-RSRP or L1-SINR along with capabilityIndex from the UE based on the methods mentioned in the third embodiment (e.g., combinations of at least one of [Method 3-1] and [Method 3-2] above).

[0538] The flowchart above illustrates a method that can be implemented according to the principles of this disclosure, and various modifications can be made to the method shown in the flowchart of the specification. For example, although shown as a series of steps, the individual steps in the corresponding figures may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, a step may be omitted or replaced with another step.

[0539] <Fifth Embodiment: Method for transmitting SRS to a UE supporting three transmit antennas>

[0540] Hereinafter, a method for transmitting SRS for a UE supporting three transmit antennas according to embodiments of the present disclosure will be described. This embodiment can be operated in combination with at least one other embodiment described in the present disclosure.

[0541] As described above, for codebook-based PUSCH transmission, a "codebook" can be configured for the UE via txConfig (higher-layer signaling). Additionally, the base station can configure an SRS resource set for the UE where usage (higher-layer signaling) is configured as a "codebook," and can configure up to two SRS resources within the SRS resource set configured for the UE. SRS resources that can be configured for a UE supporting three transmit antennas to transmit codebook-based PUSCH can follow a combination of at least one of the following methods: When configuring a "codebook" for a UE supporting three transmit antennas via txConfig (higher-layer signaling) to transmit codebook-based PUSCH, and when the UE has a maximum of two configured SRS resources (whose usage is "codebook") in the SRS resource set, the UE can support the following SRS-related transmission schemes based on its capabilities. For this purpose, the UE can have the higher-layer signaling configured for each SRS resource as shown in Table 54 below.

[0542] Table 54

[0543] - Comb tooth offset jump

[0544] ■ When the UE has configured combOffsetHopping (higher-layer signaling) in a specific SRS resource, the UE can transmit the SRS resource configured with combOffsetHopping (higher-layer signaling) based on comb offset hopping. When the UE supports comb offset hopping, the UE can determine the offset from the currently transmitted comb tooth to the next comb tooth based on a pseudo-random sequence, and can configure an initialization ID for this pseudo-random sequence for the UE using the hoppingId in combOffsetHopping. In other words, the hoppingId configured in combOffsetHopping can be used as an initialization ID for the pseudo-random sequence.

[0545] ■ Based on the configuration value of hoppingWithRepetition, which can be configured in combOffsetHopping (higher-layer signaling), from the base station, the UE can determine whether to perform comb offset hopping for each SRS symbol or for each symbol corresponding to the repetitionFactor value. When the UE has hoppingWithRepetition configured as a symbol, the UE can perform comb offset hopping for each SRS symbol, regardless of the repetitionFactor value configured via higher-layer signaling. When the UE has hoppingWithRepetition configured as a repetition, the UE can transmit SRS at the same comb position during the SRS symbol corresponding to the repetitionFactor value configured via higher-layer signaling, and can perform comb offset hopping for each repetitionFactor symbol, thereby performing SRS transmission with comb offset at a position different from the previous position.

[0546] ■ A UE may have a configured hoppingSubset, which can be configured in combOffsetHopping (higher-layer signaling) to restrict comboffset hopping to a specific subset (defining a subset of comboffsets that the UE can hop). This restriction can be introduced to differentiate between UEs that support comboffset hopping and those that do not, ensuring that UEs supporting comboffset hopping do not interfere with those that do not. A UE may have a configured transmissionComb-n4 (4 combs) or transmissionComb-n8 (8 combs), which is a bitmap higher-layer signaling corresponding to the comb size configured in the SRS resource. When the bit value at each bit position in the configured bitmap is 1, the UE can define the comboff value corresponding to the bit position with a bit value of 1 as a subset, thereby performing comboffset hopping within that subset.

[0547] ■ The UE can execute comb offset hopping together with group hopping and / or sequence hopping. By having both a configured combOffsetHopping (higher-layer signaling) in a specific SRS resource and a groupOrSequenceHopping configured for it, the UE can execute comb offset hopping together with group hopping and / or sequence hopping. Comb offset hopping and group hopping and / or sequence hopping can operate independently of each other.

[0548] - Cyclic shift jump

[0549] ■ When a UE has configured cyclicShiftHopping (higher-layer signaling) in a specific SRS resource, the UE can transmit the SRS resource configured with cyclicShiftHopping (higher-layer signaling) based on cyclic shift hopping. When the UE supports cyclic shift hopping, the UE can determine the offset from the current cyclic shift to the next cyclic shift based on a pseudo-random sequence, and can configure an initialization ID for this pseudo-random sequence using the hoppingId in cyclicShiftHopping. In other words, the hoppingId configured in cyclicShiftHopping can be used as an initialization ID for the pseudo-random sequence.

[0550] ■ A UE may have a configured hoppingSubset, which can be configured in cyclicShiftHopping (higher-layer signaling) to restrict cyclic shift hopping to a specific subset (defining the subset of cyclic shifts that the UE can hop). This restriction can be introduced to differentiate between UEs that support cyclic shift hopping and those that do not, ensuring that UEs that support cyclic shift hopping do not interfere with those that do not. A UE may have a configured transmissionComb-n2 (a cyclic shift of size 8 corresponding to a comb tooth size of 2), transmissionComb-n4 (a cyclic shift of size 12 corresponding to a comb tooth size of 4), or transmissionComb-n8 (a cyclic shift of size 6 corresponding to a comb tooth size of 8), which is a bitmap higher-layer signaling corresponding to the cyclic shift size configured in the SRS resource. When the bit value at each bit position in the configured bitmap is 1, the UE can define the cyclic shift value corresponding to the bit position with a bit value of 1 as a subset, and then perform a cyclic shift transition in the subset.

[0551] ■ The UE can have a configured hoppingFinerGranularity, which can be configured in cyclicShiftHopping (higher-layer signaling) so that when performing a cyclic shift hop, the UE can perform the hop by using a smaller unit of cyclic shift. When the UE has hoppingFinerGranularity configured as "enabled," the UE can use a cyclic shift hop unit with double the fineness. For example, if the UE has a comb size configured as 2 and therefore a corresponding cyclic shift size configured as 8, the UE can instead of using the value obtained by equivalently dividing 2π by 8 as the cyclic shift hop unit, it can consider that 16 is twice the cyclic shift size of 8 and use a value obtained by equivalently dividing 2π by 16 when performing a cyclic shift hop. If a UE has an hoppingSubset configured for it (which can be configured in cyclicShiftHopping (higher-layer signaling)), the UE cannot have an hoppingFinerGranularity configured for it.

[0552] ■ The UE can execute cyclic shift hopping together with group hopping and / or sequence hopping. By having cyclicShiftHopping (higher-layer signaling) configured in a specific SRS resource and groupOrSequenceHopping configured for it, the UE can be capable of executing cyclic shift hopping together with group hopping and / or sequence hopping. Cyclic shift hopping and group hopping and / or sequence hopping can operate independently of each other.

[0553] - A UE can have both configured comb offset transitions and cyclic shift transitions simultaneously within a single SRS resource. In this case, the comb offset transitions and cyclic shift transitions can operate independently of each other.

[0554] The above description regarding UE capabilities supporting the aforementioned details may imply that the UE can report support for the aforementioned details to the base station by reporting new UE capabilities. Alternatively, these UE capabilities can be supported when the UE reports previously defined UE capabilities to the base station based on three antenna ports, indicating UE capabilities supporting three antenna ports, and / or indicating UE capabilities that may perform codebook-based PUSCH transmissions and / or codebook-based SRS transmissions. - Feature group (FG) 40-5-1: SRS comb tooth offset jump ■ The UE can report in each frequency band: it can support comb tooth offset jump.

[0555] -FG 40-5-2: SRS Cyclic Shift Jump

[0556] ■ The UE can report in each frequency band: it can support cyclic shift transitions.

[0557] -FG 40-5-2a: Smaller cyclic shift granularity for cyclic shift jumps

[0558] ■ The UE can report in each frequency band: during cyclic shift transitions, the transition can be supported in minutes.

[0559] -FG 40-5-1c: Comb offset jump within a subset

[0560] ■ The UE can report in each frequency band: comb offset hopping can be supported in subsets.

[0561] -FG 40-5-2c: Cyclic shift transition within a subset

[0562] ■ The UE can report in each frequency band: cyclic shift transitions can be supported in subsets.

[0563] -FG 40-5-1b: SRS comb-off transition combined with conventional group / sequence transitions

[0564] ■ The UE can report in each frequency band: it can support comb offset transitions and sequence and / or group transitions together.

[0565] -FG 40-5-2b: SRS Cyclic Shift Jump Combined with Traditional Group / Sequence Jumps

[0566] ■ The UE can report in each frequency band: it can support cyclic shift transitions and sequence and / or group transitions together.

[0567] -FG 40-5-3: SRS Cyclic Shift Jump Combined with SRS Comb Tooth Offset Jump

[0568] ■ The UE can report in each frequency band: it can support comb offset transition and cyclic shift transition together.

[0569] -FG 40-5-1a: Comb offset jump time-domain behavior when repetition factor R>1

[0570] ■ When the repetitionFactor is configured to be greater than 1, the UE can report a scheme that supports comb offset hopping for each frequency band. The UE can choose one of "per SRS symbol," "per R SRS symbols," or "both" as the corresponding UE capability reporting value. For example, if the UE reports "per SRS symbol" and the repetitionFactor value is configured to be greater than 1, it may mean that the UE can perform comb offset hopping for each SRS symbol. If the UE reports "per R SRS symbols" and the repetitionFactor value is configured to be greater than R>1, it may mean that the UE can perform comb offset hopping for each SRS symbol. R Each SRS symbol performs a comb offset transition. A UE reporting "both" likely means the UE can support both of these operations.

[0571] In embodiments of this disclosure, the UE may define various detailed methods in [Method 1-1] above, as follows: As a detailed method in [Method 1-1] above, [Detailed Method 1] can be defined such that the UE determines not to perform transmission in the last antenna port (e.g., antenna port 1003) among the four antenna ports constituting the SRS resource (included therein).

[0572] As another detailed method in [Method 1-1] above, [Detailed Method 2] can be defined such that the UE determines that no transmission is performed in the first antenna port (e.g., antenna port 1000) of the four antenna ports constituting the SRS resource (included therein).

[0573] As another detailed method in [Method 1-1] above, [Detailed Method 3] can be defined such that the UE determines that no transmission is performed in any of the four antenna ports constituting the SRS resource (included therein), which can be defined by the specification (e.g., antenna port 1002, or any of antenna ports 1000 to 1003).

[0574] As another detailed method in [Method 1-1] above, [Detailed Method 4] can be defined such that the UE determines that it will not perform transmission in one of the four antenna ports constituting the SRS resource (included therein) based on a notification from the base station (a combination of at least one of higher-layer signaling, MAC-CE signaling and L1 signaling) (for example, the base station can determine by higher-layer signaling that it will not transmit on antenna port 1002).

[0575] The UE can report a combination of at least one of [Detailed Method 1] to [Detailed Method 4] as a UE capability (via UE capability). This UE capability can be reported as one of the following types: per feature set per component carrier (FSPC), per feature set (FS), per frequency band, per cell, per UE, and per frequency band combination.

[0576] - As an example, a UE can report that it supports [Detailed Method 1] as a UE capability. The UE capability indicating support for [Detailed Method 1] can be implicitly reported through the basic UE capabilities of a UE supporting three transmit antennas (e.g., based on SRS resources configured with four antenna ports, the corresponding UE capability could include a method supporting codebook-based PUSCH transmission, or a method supporting only three antenna ports), or it can be explicitly reported as a single UE capability. If a single UE capability is not reported, the base station can interpret this as the UE supporting the aforementioned [Detailed Method 1].

[0577] - As another example, the UE can report a combination of supporting at least one of [Detailed Method 1] and [Detailed Method 4] as a UE capability. Based on the basic UE capability of a UE supporting three transmit antennas, an indication that a UE capability can support a combination of at least one of [Detailed Method 1] and [Detailed Method 4] can be reported as one of the following three: "Supports [Detailed Method 1]", "Supports [Detailed Method 4]", and "Supports both [Detailed Method 1] and [Detailed Method 4]", or one of the following two: "Supports [Detailed Method 1]" and "Supports both [Detailed Method 1] and [Detailed Method 4]", or one of the following two: "Supports [Detailed Method 4]" and "Supports both [Detailed Method 1] and [Detailed Method 4]" (e.g., based on SRS resources configured with four antenna ports, the corresponding UE capability could include a method supporting codebook-based PUSCH transmission and a method supporting only three antenna ports). Additionally, the UE can report individual UE capabilities for each of [Detailed Method 1] and [Detailed Method 4]. If not all individual UE capabilities are reported, the base station can interpret this as the UE supporting the aforementioned [Detailed Method 1]. In addition, the UE can report support for [Detailed Method 1] through basic UE capabilities, and can report support for [Detailed Method 4] as an additional UE capability.

[0578] The base station may notify the UE of at least one combination of [Detailed Method 1] to [Detailed Method 4] via at least one combination of higher-layer signaling, MAC-CE signaling and L1 signaling, or the UE may expect to receive support via a method fixed in the specification.

[0579] - As an example, regarding the method of not performing transmission for one of the four antenna ports constituting the SRS resource, the UE may expect to define the above [Detailed Method 1] fixedly in the specification.

[0580] - As another example, regarding the method of not performing transmission for one of the four antenna ports constituting an SRS resource, the UE may expect to define the above [Detailed Method 4] fixedly in the specification. Therefore, the UE may not perform SRS transmission for a specific antenna port indicated by a specific higher-layer signaling configuration, and the UE may perform transmission only for three SRS ports for an SRS resource with four ports. The higher-layer signaling used to indicate which antenna port it does not perform SRS transmission for can be configured individually for each SRS resource, or it can be configured in a set of SRS resources to restrict transmissions such that not all SRS resources in the set are transmitted in the same antenna port. Without configuring specific higher-layer signaling for the UE to indicate which antenna port it does not perform SRS transmission for, the UE may support one of the above [Detailed Method 1], [Detailed Method 2], and [Detailed Method 3].

[0581] Furthermore, if the UE has already reported specific UE capabilities to the base station, the base station can notify the UE of at least one combination of [Detailed Method 1] to [Detailed Method 4] through at least one combination of higher-layer signaling, MAC-CE signaling, and L1 signaling, or the UE can define the method in the specification and operate accordingly. Otherwise (if the UE has not reported specific UE capabilities to the base station), the base station can notify the UE of at least one combination of [Detailed Method 1] to [Detailed Method 4] through at least one combination of higher-layer signaling, MAC-CE signaling, and L1 signaling, or the UE can define the method in the specification and operate accordingly.

[0582] - As an example, if the UE has reported to the base station its capability to support at least one of comb offset transitions and / or cyclic shift transitions, and if the base station has performed specific higher-layer signaling configurations, the UE can perform SRS transmission according to [Detailed Method 4]. Otherwise, the UE can perform SRS transmission according to [Detailed Method 1].

[0583] - As another example, if the UE has reported to the base station its capability to support at least one of comb offset transitions and / or cyclic shift transitions, and if the base station has performed specific higher-layer signaling configurations, the UE can perform SRS transmission according to [Detailed Method 1]. Otherwise, the UE can perform SRS transmission according to [Detailed Method 4].

[0584] - As another example, if the UE has reported to the base station its UE capability to support at least one of comb offset transitions and / or cyclic shift transitions, the UE can perform SRS transmissions according to [Detailed Method 1] without requiring specific higher-layer signaling configuration from the base station. If the UE has not reported its UE capability regarding comb offset transitions and / or cyclic shift transitions, the UE can perform SRS transmissions according to [Detailed Method 4] without requiring specific higher-layer signaling configuration from the base station.

[0585] - As another example, if the UE has reported to the base station its UE capability to support at least one of comb offset transitions and / or cyclic shift transitions, the UE can perform SRS transmissions according to [Detailed Method 4] without requiring specific higher-layer signaling configuration from the base station. If the UE has not reported its UE capability regarding comb offset transitions and / or cyclic shift transitions, the UE can perform SRS transmissions according to [Detailed Method 1] without requiring specific higher-layer signaling configuration from the base station.

[0586] - The aforementioned UE capabilities regarding comb offset transitions and / or cyclic shift transitions can be a combination of at least one of existing UE capabilities or new UE capabilities, which can express the functions represented by FG ​​40-5-1, FG 40-5-2, FG 40-5-2a, FG 40-5-1c, FG 40-5-2c, FG 40-5-1b, FG 40-5-2b, FG 40-5-3, and FG 40-5-1a.

[0587] Figure 15 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0588] refer to Figure 15 The UE may include a transceiver (representing the UE receiver 1500 and UE transmitter 1510 as a whole), a memory (not shown), and a UE processor 1505 (or UE controller or processor). The UE transceivers 1500 and 1510, the memory, and the UE processor 1505 can operate according to the communication methods described above for the UE. The components of the UE are not limited to the examples described above. For example, the UE may include more or fewer components than those described above. Furthermore, the transceiver, memory, and processor may be implemented as a single chip.

[0589] A transceiver can transmit / receive signals with a base station. These signals may include control information and data. For this purpose, a transceiver may include an RF transmitter configured to up-convert and amplify the frequency of the transmitted signal, an RF receiver configured to amplify the received signal with low noise and down-convert its frequency, etc. However, this is only one embodiment of a transceiver, and the components of a transceiver are not limited to RF transmitters and RF receivers.

[0590] In addition, the transceiver can receive signals, output signals to the processor, and transmit signals output from the processor via the wireless channel.

[0591] The memory can store programs and data necessary for the operation of the UE. Additionally, the memory can store control information or data included in signals sent / received by the UE. The memory can include storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or combinations of storage media. Furthermore, the memory can include multiple memories.

[0592] Furthermore, the processor can control a series of processes that enable the UE to operate according to the above embodiments. For example, the processor can control the UE's components to receive DCIs configured in two layers to receive multiple PDSCHs simultaneously. The processor may include multiple processors, and the processor can perform operations controlling the UE's components by executing programs stored in memory.

[0593] Figure 16 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0594] refer to Figure 16 The base station may include a transceiver (not shown) representing the base station receiver 1600 and base station transmitter 1610 as a whole, a memory (not shown), and a base station processor 1605 (or a base station controller or processor). The base station transceivers 1600 and 1610, the memory, and the base station processor 1605 can operate according to the communication method described above for the base station. 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 those described above. Furthermore, the transceiver, memory, and processor may be implemented as a single chip.

[0595] A transceiver can transmit / receive signals with a UE. These signals may include control information and data. For this purpose, a transceiver may include an RF transmitter configured to up-convert and amplify the frequency of the transmitted signals, an RF receiver configured to amplify the received signals with low noise and down-convert their frequency, etc. However, this is only one embodiment of a transceiver, and the components of the transceiver are not limited to RF transmitters and RF receivers.

[0596] In addition, the transceiver can receive signals, output signals to the processor, and transmit signals output from the processor via the wireless channel.

[0597] The memory can store the programs and data necessary for the operation of the base station. Additionally, the memory can store control information or data included in signals transmitted / received by the base station. The memory can include storage media such as read-only memory (ROM), random access memory (RAM), hard disk, optical disc (CD)-ROM, and digital versatile disc (DVD), or combinations of storage media. Furthermore, the memory can include multiple memory modules.

[0598] The processor can control a series of processes that enable the base station to operate according to the embodiments of the present disclosure described above. For example, the processor can control components of the base station to configure DCIs in two layers, including allocation information regarding multiple PDSCHs, and transmit the configured DCIs. The processor may include multiple processors, and the processor can perform operations controlling the components of the base station by executing programs stored in memory.

[0599] The methods disclosed in the claims and / or the methods of the embodiments described in this disclosure can be implemented by hardware, software, or a combination of hardware and software.

[0600] When the method is implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within an electronic device. At least one program includes instructions that cause the electronic device to perform the method as defined by the appended claims and / or as disclosed herein, according to various embodiments of this disclosure.

[0601] These programs (software modules or software) can be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), disk storage devices, compressed optical disc-ROM (CD-ROM), digital versatile optical disc (DVD), or other types of optical storage devices, or magnetic tape cassettes. Alternatively, any combination of some or all of them can form the memory in which the programs are stored. Furthermore, an electronic device may include multiple such memories.

[0602] Furthermore, the program can be stored on an attachable storage device that can be accessed by the electronic device via a communication network such as the Internet, intranet, local area network (LAN), wide area network (WLAN), and storage area network (SAN), or a combination thereof. Such storage devices can access the electronic device via an external port. Additionally, a separate storage device on a communication network can access portable electronic devices.

[0603] In the detailed embodiments described above, elements included in this disclosure are represented in a singular or plural form according to the presented embodiments. However, for ease of description, the singular or plural form is chosen as appropriate for the presented situation, and this disclosure is not limited to elements represented in a singular or plural form. Thus, an element represented in a plural form may also include a single element, or an element represented in a singular form may include multiple elements.

[0604] The embodiments described and illustrated in the specification and drawings are merely specific embodiments presented to facilitate the explanation of the technical content of the embodiments of the present disclosure and to aid in the understanding of the embodiments of the present disclosure, and are not intended to limit the scope of the embodiments of the present disclosure. That is, it will be apparent to those skilled in the art that other variations based on the technical concept of the present disclosure can be implemented. Furthermore, the corresponding embodiments described above can be combined as needed. For example, a portion of an embodiment of the present disclosure can be combined with a portion of another embodiment to operate a base station and a terminal. As an example, a portion of a first embodiment of the present disclosure can be combined with a portion of a second embodiment to operate a base station and a terminal. Moreover, although the above embodiments have been described based on an FDD LTE system, other variations based on the technical concept of the embodiments can be implemented in other communication systems such as TDD LTE and 5G or NR systems.

[0605] In the accompanying drawings describing the methods of this disclosure, the order of description does not always correspond to the order of execution steps, and the order of steps may be changed or steps may be executed in parallel.

[0606] Alternatively, in the accompanying drawings describing the methods of this disclosure, some elements may be omitted without departing from the essential spirit and scope of this disclosure, and only some elements may be included.

[0607] Furthermore, in the methods of this disclosure, some or all of the contents of each embodiment may be combined and implemented without departing from the essential spirit and scope of this disclosure.

[0608] Although this disclosure has been shown and described with reference to various embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: The system receives configuration information related to the transmission of Sound Reference Signals (SRS) associated with codebook-based uplink transmission from the base station. The configuration information includes an SRS resource set, which includes SRS resources configured by four ports. as well as The SRS is transmitted to the base station using three ports on the SRS resource. Specifically, the SRS transmission is not performed on the port with the largest port index among the four ports configured with the SRS resource.

2. The method according to claim 1, wherein, Regarding the remaining three ports, excluding the port for which the SRS transmission is not performed, the SRS transmission power is equally distributed, and The SRS resource set includes a maximum of two SRS resources.

3. The method according to claim 1, wherein, Configure the rank-1 codebook for the codebook-based uplink transmission based on the following table. [surface] The rank-2 codebook used for the codebook-based uplink transmission is configured based on the following table, and [surface] The rank-3 codebook used for the codebook-based uplink transmission is configured based on the following table. [surface] 。 4. The method according to claim 3, wherein, The SRS resource set includes a first SRS resource set and a second SRS resource set. The method includes: Receive information about the maximum transmission rank of the terminal from the base station; and Downlink control information is received from the base station, the downlink control information including a first Transport Precoding Matrix Indicator (TPMI) field associated with the first SRS resource set and a second TPMI field associated with the second SRS resource set. The first TPMI field has a bit field configured to map to a TPMI index in the precoding matrix included in the codebook, corresponding to a transmission rank value that is equal to or less than the maximum transmission rank value configured based on information about the maximum transmission rank of the terminal. The second TPMI field has a bit field whose size is configured such that the code points of the bit field of the second TPMI field can be mapped to all TPMI indices of the codebooks that include the most precoding matrices among the rank-1, rank-2, and rank-3 codebooks. The TPMI index mapped to the code point of the second TPMI field has a transmission rank configured to be the same as the transmission rank of the TPMI index indicated by the first TPMI field.

5. A method performed by a base station in a wireless communication system, the method comprising: Send configuration information related to the transmission of sounding reference signals (SRS) associated with codebook-based uplink transmission to the terminal. The configuration information includes an SRS resource set, which includes SRS resources configured by four ports. as well as SRS is received from the terminal using three ports on the SRS resource. Specifically, the SRS reception is not performed on the port with the largest port index among the four ports configured with the SRS resource.

6. The method according to claim 5, wherein, Regarding the remaining three ports, excluding the port for which the SRS transmission is not performed, the SRS transmission power is equally distributed, and The SRS resource set includes a maximum of two SRS resources.

7. The method according to claim 5, wherein, Configure the rank-1 codebook for the codebook-based uplink transmission based on the following table. [surface] The rank-2 codebook used for the codebook-based uplink transmission is configured based on the following table, and [surface] The rank-3 codebook used for the codebook-based uplink transmission is configured based on the following table. [surface] 。 8. The method according to claim 7, wherein, The SRS resource set includes a first SRS resource set and a second SRS resource set. The method includes: Receive information about the maximum transmission rank of the terminal from the base station; and Downlink control information is received from the base station, the downlink control information including a first Transport Precoding Matrix Indicator (TPMI) field associated with the first SRS resource set and a second TPMI field associated with the second SRS resource set. The first TPMI field has a bit field configured to map to a TPMI index in the precoding matrix included in the codebook, corresponding to a transmission rank value that is equal to or less than the maximum transmission rank value configured based on information about the maximum transmission rank of the terminal. The second TPMI field has a bit field whose size is configured such that the code points of the bit field of the second TPMI field can be mapped to all TPMI indices of the codebooks that include the most precoding matrices among the rank-1, rank-2, and rank-3 codebooks. The TPMI index mapped to the code point of the second TPMI field has a transmission rank configured to be the same as the transmission rank of the TPMI index indicated by the first TPMI field.

9. A terminal in a wireless communication system, the terminal comprising: transceiver; as well as The controller is connected to the transceiver. The controller is configured as follows: The system receives configuration information related to Sounding Reference Signal (SRS) transmission associated with codebook-based uplink transmission from the base station. This configuration information includes an SRS resource set, which comprises SRS resources configured by four ports. The SRS is transmitted to the base station using three ports on the SRS resource. Specifically, the SRS transmission is not performed on the port with the largest port index among the four ports configured with the SRS resource.

10. The terminal according to claim 9, wherein, Regarding the remaining three ports, excluding the port for which the SRS transmission is not performed, the SRS transmission power is equally distributed, and The SRS resource set includes a maximum of two SRS resources.

11. The terminal according to claim 9, wherein, Configure the rank-1 codebook for the codebook-based uplink transmission based on the following table. [surface] The rank-2 codebook used for the codebook-based uplink transmission is configured based on the following table, and [surface] The rank-3 codebook used for the codebook-based uplink transmission is configured based on the following table. [surface] 。 12. The terminal according to claim 11, wherein, The SRS resource set includes a first SRS resource set and a second SRS resource set. The controller is further configured as follows: Receive information about the maximum transmission rank of the terminal from the base station; and Downlink control information is received from the base station, the downlink control information including a first Transport Precoding Matrix Indicator (TPMI) field associated with the first SRS resource set and a second TPMI field associated with the second SRS resource set. The first TPMI field has a bit field configured to map to a TPMI index in the precoding matrix included in the codebook, corresponding to a transmission rank value that is equal to or less than the maximum transmission rank value configured based on information about the maximum transmission rank of the terminal. The second TPMI field has a bit field whose size is configured such that the code points of the bit field of the second TPMI field can be mapped to all TPMI indices of the codebooks that include the most precoding matrices among the rank-1, rank-2, and rank-3 codebooks. The TPMI index mapped to the code point of the second TPMI field has a transmission rank configured to be the same as the transmission rank of the TPMI index indicated by the first TPMI field.

13. A base station in a wireless communication system, the base station being configured to: Sending configuration information to the terminal related to the Sound Reference Signal (SRS) transmission associated with codebook-based uplink transmission, the configuration information including an SRS resource set comprising SRS resources configured by four ports; and SRS is received from the terminal using three ports on the SRS resource. in, The SRS reception is not performed on the port with the largest port index among the four ports configured with the SRS resource.

14. The base station according to claim 13, wherein, Regarding the remaining three ports, excluding the port for which the SRS transmission is not performed, the SRS transmission power is equally distributed, and The SRS resource set includes a maximum of two SRS resources.

15. The base station according to claim 13, wherein, Configure the rank-1 codebook for the codebook-based uplink transmission based on the following table. [surface] The rank-2 codebook used for the codebook-based uplink transmission is configured based on the following table, and [surface] The rank-3 codebook used for the codebook-based uplink transmission is configured based on the following table. [surface] 。

Images