Method and device for uplink data transmission and reception based on sub-band precoding in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure relates to the operations of a terminal and a base station in a wireless communication system and, specifically, to a method for uplink data transmission based on sub-band precoding in a wireless communication system, and a device capable of performing same. The present disclosure provides a device and method capable of effectively providing services in a mobile communication system.

Description

Method and device for transmitting and receiving uplink data based on subband precoding in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a subband precoding-based uplink data transmission and reception method in a wireless communication system, and a device capable of performing the same.

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

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

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

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

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

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

[0008] The disclosed embodiment seeks to provide a device and method capable of effectively providing a service in a mobile communication system.

[0009] The technical problems to be achieved in various embodiments of the present disclosure are not limited to those mentioned above, and other technical problems not mentioned can be considered by a person having ordinary skill in the art from various embodiments of the present disclosure described below.

[0010] A method performed by a terminal in a communication system according to one embodiment of the present disclosure comprises the steps of: receiving a first configuration for a channel state information reference signal (CSI-RS) and a second configuration for a sounding reference signal (SRS) through higher layer signaling; identifying a plurality of first precoders for a plurality of SRS resources associated with the second configuration based on measurements of CSI-RS resources associated with the first configuration; performing SRS transmission on the plurality of SRS resources based on the plurality of first precoders; receiving downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH) through a physical downlink control channel (PDCCH); identifying a plurality of second precoders for a plurality of subbands included in a wideband to which the PUSCH is allocated based on the DCI, the plurality of second precoders being at least some of the plurality of first precoders; and a step of transmitting the PUSCH based on applying the plurality of second precoders to the plurality of subbands.

[0011] According to one embodiment of the present disclosure, a second precoder for one subband is identified as one or a combination of one or more of the plurality of first precoders, and the number of second precoders for one subband may be equal to a rank for the PUSCH.

[0012] According to one embodiment of the present disclosure, a processing time of the terminal for the plurality of first precoders is defined as 42 symbols for the case where the plurality of first precoders are identified by the terminal for the wideband, and is defined as 42+d symbols for the case where the plurality of first precoders are identified by the terminal for the plurality of subbands, where d may be related to the number of the plurality of subbands.

[0013] According to one embodiment of the present disclosure, the DCI includes: a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, the number of bits included in each SRI field is the number N of the plurality of SRS resources, or a plurality of SRI fields, a first SRI field among the plurality of SRI fields indicating a second precoder for the rank and a corresponding subband, the number of bits included in the first SRI field is N, each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicating a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. A value that maximizes or includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. A value that maximizes the rank, or includes one field indicating the rank and one SRI field, and a code point of the one SRI field can indicate the plurality of second precoders.

[0014] According to one embodiment of the present disclosure, when one precoder is identified based on the DCI, the PUSCH can be transmitted based on applying the one precoder to the wideband.

[0015] According to one embodiment of the present disclosure, when the one precoder is identified: the plurality of second precoders are identified identically based on the DCI, or one of the plurality of second precoders is identified based on the DCI and the remaining precoders of the plurality of second precoders except the one precoder are identified as reserved.

[0016] A terminal of a communication system according to one embodiment of the present disclosure comprises a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: receive, via higher layer signaling, a first configuration for a channel state information reference signal (CSI-RS) and a second configuration for a sounding reference signal (SRS); identify a plurality of first precoders for a plurality of SRS resources associated with the second configuration based on measurements of CSI-RS resources associated with the first configuration; perform SRS transmission on the plurality of SRS resources based on the plurality of first precoders; receive, via a physical downlink control channel (PDCCH), downlink control information (DCI) scheduling a physical uplink shared channel (PUSCH); identify, based on the DCI, a plurality of second precoders for a plurality of subbands included in a wideband to which the PUSCH is allocated, the plurality of second precoders being at least some of the plurality of first precoders; And the PUSCH can be set to be transmitted based on applying the plurality of second precoders to the plurality of subbands.

[0017] According to one embodiment of the present disclosure, a second precoder for one subband is identified as one or a combination of one or more of the plurality of first precoders, and the number of second precoders for one subband may be equal to a rank for the PUSCH.

[0018] According to one embodiment of the present disclosure, a processing time of the terminal for the plurality of first precoders is defined as 42 symbols for the case where the plurality of first precoders are identified by the terminal for the wideband, and is defined as 42+d symbols for the case where the plurality of first precoders are identified by the terminal for the plurality of subbands, where d may be related to the number of the plurality of subbands.

[0019] According to one embodiment of the present disclosure, the DCI includes: a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, the number of bits included in each SRI field is the number N of the plurality of SRS resources, or a plurality of SRI fields, a first SRI field among the plurality of SRI fields indicating a second precoder for the rank and a corresponding subband, the number of bits included in the first SRI field is N, each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicating a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. A value that maximizes or includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. A value that maximizes the rank, or includes one field indicating the rank and one SRI field, and a code point of the one SRI field can indicate the plurality of second precoders.

[0020] According to one embodiment of the present disclosure, when one precoder is identified based on the DCI, the PUSCH can be transmitted based on applying the one precoder to the wideband.

[0021] According to one embodiment of the present disclosure, when the one precoder is identified: the plurality of second precoders are identified identically based on the DCI, or one of the plurality of second precoders is identified based on the DCI and the remaining precoders of the plurality of second precoders except the one precoder are identified as reserved.

[0022] A method performed by a base station in a communication system according to one embodiment of the present disclosure comprises the steps of: transmitting a first configuration for a channel state information reference signal (CSI-RS) and a second configuration for a sounding reference signal (SRS) via higher layer signaling; receiving an SRS from a plurality of SRS resources associated with the second configuration; identifying a plurality of first precoders for the plurality of SRS resources, the plurality of first precoders being associated with the first configuration; identifying a plurality of second precoders for a plurality of subbands included in a wideband to which a physical uplink shared channel (PUSCH) is allocated, the plurality of second precoders being at least some of the plurality of first precoders; transmitting downlink control information (DCI) scheduling the PUSCH via a physical downlink control channel (PDCCH), the DCI being associated with the plurality of second precoders; And it may include a step of receiving the PUSCH based on the application of the plurality of second precoders to the plurality of subbands.

[0023] According to one embodiment of the present disclosure, a second precoder for one subband is identified as one or a combination of one or more of the plurality of first precoders, and the number of second precoders for one subband may be equal to a rank for the PUSCH.

[0024] According to one embodiment of the present disclosure, the DCI includes: a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, the number of bits included in each SRI field is the number N of the plurality of SRS resources, or a plurality of SRI fields, a first SRI field among the plurality of SRI fields indicating a second precoder for the rank and a corresponding subband, the number of bits included in the first SRI field is N, each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicating a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. A value that maximizes or includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. A value that maximizes the rank, or includes one field indicating the rank and one SRI field, and a code point of the one SRI field can indicate the plurality of second precoders.

[0025] According to one embodiment of the present disclosure, a base station of a communication system includes a transceiver; and a processor connected to the transceiver, wherein the processor is configured to: transmit a first configuration for a channel state information reference signal (CSI-RS) and a second configuration for a sounding reference signal (SRS) via higher layer signaling; receive an SRS from a plurality of SRS resources associated with the second configuration; identify a plurality of first precoders for the plurality of SRS resources, the plurality of first precoders being associated with the first configuration; identify a plurality of second precoders for a plurality of subbands included in a wideband to which a physical uplink shared channel (PUSCH) is allocated, the plurality of second precoders being at least some of the plurality of first precoders; transmit downlink control information (DCI) scheduling the PUSCH via a physical downlink control channel (PDCCH), the DCI being associated with the plurality of second precoders; And the plurality of second precoders may be configured to receive the PUSCH based on application to the plurality of subbands.

[0026] According to one embodiment of the present disclosure, the DCI includes: a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, the number of bits included in each SRI field is the number N of the plurality of SRS resources, or a plurality of SRI fields, a first SRI field among the plurality of SRI fields indicating a second precoder for the rank and a corresponding subband, the number of bits included in the first SRI field is N, each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicating a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. A value that maximizes or includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. A value that maximizes the rank, or includes one field indicating the rank and one SRI field, and a code point of the one SRI field can indicate the plurality of second precoders.

[0027] The various embodiments of the present disclosure described above are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description to be described below.

[0028] The disclosed embodiment provides a device and method capable of effectively providing a service in a mobile communication system.

[0029] The effects that can be obtained from various embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by a person having ordinary skill in the art based on the detailed description below.

[0030] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0031] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0032] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0033] FIG. 4 is a diagram illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation in a wireless communication system according to one embodiment of the present disclosure.

[0034] FIG. 5 is a diagram of a beam application time that can be considered when using an integrated TCI method in a wireless communication system according to one embodiment of the present disclosure.

[0035] FIG. 6 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or a separate DL or UL TCI state in a wireless communication system according to one embodiment of the present disclosure.

[0036] Figure 7 is a diagram illustrating an example of an aperiodic CSI reporting method.

[0037] FIG. 8 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0038] FIG. 9 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0039] FIG. 10 is a diagram illustrating an example of frequency axis resource allocation of PDSCH or PUSCH in a wireless communication system according to one embodiment of the present disclosure.

[0040] FIG. 11 is a diagram illustrating an example of time axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0041] FIG. 12 is a diagram illustrating a method for determining an available slot when a terminal transmits PUSCH repetition type A in a wireless communication system according to an embodiment of the present disclosure.

[0042] FIG. 13 is a diagram illustrating an example of a PUSCH (physical uplink shared channel) repetitive transmission type B in a wireless communication system according to one embodiment of the present disclosure.

[0043] FIG. 14 is a diagram illustrating an example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0044] FIG. 15 is a diagram illustrating an example of configuring downlink control information (DCI) for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0045] FIG. 16 is a diagram illustrating an uplink-downlink resource configuration of an XDD system that flexibly divides uplink and downlink resources in the time domain and frequency domain according to one embodiment of the present disclosure.

[0046] FIG. 17 is a diagram illustrating an example of an uplink-downlink resource configuration of a full duplex communication system in which uplink and downlink resources are flexibly divided into time domain and frequency domain according to one embodiment of the present disclosure.

[0047] FIG. 18 is a diagram illustrating a transmission and reception structure for a duplex method according to one embodiment of the present disclosure.

[0048] Figure 19 is a diagram illustrating an example of downlink and uplink resource settings in an XDD system.

[0049] Figure 20 is a diagram illustrating an example of SBFD operation in a TDD band of a wireless communication system to which the present disclosure applies. (a55)

[0050] FIG. 21 is a diagram illustrating an SBFD setting according to one embodiment of the present disclosure.

[0051] FIG. 22 is a diagram illustrating one method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to one embodiment of the present disclosure.

[0052] FIG. 23 is a diagram illustrating another method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to an embodiment of the present disclosure.

[0053] FIG. 24 is a diagram illustrating another method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to an embodiment of the present disclosure.

[0054] FIG. 25 is a diagram illustrating another method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to an embodiment of the present disclosure.

[0055] FIG. 26 is a diagram illustrating the operation of a terminal according to one embodiment of the present disclosure.

[0056] FIG. 27 is a diagram illustrating the operation of a base station according to one embodiment of the present disclosure.

[0057] FIG. 28 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0058] FIG. 29 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0059] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0060] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to ensure that the gist of the present disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0061] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0062] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout the specification.

[0063] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems through some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0064] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0065] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0066] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0067] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0068] As a representative example of the above broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0069] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0070] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band.

[0071] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage. This may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0072] Finally, URLLC refers to a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services such as remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and, at the same time, must have a 10 -5The following packet error rate (PER) requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a smaller Transmit Time Interval (TTI) than other services. Simultaneously, design considerations may require the allocation of extensive resources in the frequency band to ensure communication link reliability.

[0073] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0074] Hereinafter, a / b can be understood as at least one of a or b.

[0075] [NR time-frequency resources]

[0076] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0077] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

[0078] The horizontal axis of Figure 1 represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE, 101), which can be defined as 1 OFDM symbol (102) on the time axis and 1 subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can constitute one resource block (RB, 104). One subframe (110) on the time axis can include multiple OFDM symbols (102). For example, the length of one subframe can be 1 ms.

[0079] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0080] Figure 2 illustrates an example of a structure of a frame (Frame, 200), a subframe (Subframe, 201), and a slot (Slot, 202). One frame (200) can be defined as 10ms. One subframe (201) can be defined as 1ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( =14). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per 1 subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In an example of FIG. 2, cases where the subcarrier spacing setting value μ = 0 (204) and μ = 1 (205) are illustrated. When μ = 0 (204), 1 subframe (201) may be composed of one slot (202), and when μ = 1 (205), 1 subframe (201) may be composed of two slots (203). That is, the number of slots per 1 subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Depending on the subcarrier spacing setting μ and can be defined as [Table 1] below.

[0081] [Table 1]

[0082]

[0083] [Bandwidth Part (BWP)]

[0084] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0085] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0086] FIG. 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information in [Table 2] below for each bandwidth portion.

[0087] [Table 2]

[0088]

[0089] Of course, the above example is not limited, and in addition to the above configuration information, various parameters related to the bandwidth portion can be configured for the terminal. The above information can be transmitted from the base station to the terminal via upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth portion among the configured one or more bandwidth portions can be activated. Whether or not the configured bandwidth portion is activated can be semi-statically transmitted from the base station to the terminal via RRC signaling or dynamically transmitted via DCI.

[0090] According to some embodiments, a terminal before RRC connection can be configured with an initial bandwidth portion (Initial BWP) for initial access from a base station through a Master Information Block (MIB). More specifically, the terminal can receive configuration information about a control resource set (CORESET) and a search space in which a PDCCH for receiving system information required for initial access (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)) and search space can be transmitted through the MIB during the initial access phase. The control space and search space configured by the MIB can each be regarded as identifier (ID) 0. The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control space #0 through the MIB. Additionally, the base station can notify the terminal of the monitoring cycle and monitoring occasion settings for control area #0, i.e., search space #0, via the MIB. The terminal can consider the frequency range set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access. At this time, the identifier (ID) of the initial bandwidth portion can be considered as 0.

[0091] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0092] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0093] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0094] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth, for example, 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, for example, 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0095] In the method for setting the bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the initial bandwidth portion (Initial BWP) through the MIB during the initial access phase. More specifically, the terminal can receive a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive the Physical Downlink Shared Channel (PDSCH) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (Other System Information (OSI), paging, and random access).

[0096] [Bandwidth Part (BWP) Change]

[0097] When one or more bandwidth part values ​​are set for a terminal, the base station can instruct the terminal to change (or switch, transition) the bandwidth part value using the bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently activated bandwidth part of the terminal is bandwidth part #1 (301), the base station can instruct the terminal to bandwidth part #2 (302) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (302) indicated by the bandwidth part indicator in the received DCI.

[0098] As described above, since DCI-based bandwidth part change can be indicated by DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth part change request, it must be able to receive or transmit PDSCH or PUSCH scheduled by the corresponding DCI without difficulty in the changed bandwidth part. To this end, the standard stipulates the delay time (T) required when changing the bandwidth part. BWP ) and can be defined as in [Table 3] below, for example.

[0099] [Table 3]

[0100]

[0101] The bandwidth-partial change delay time requirement supports Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth-partial delay time type to the base station.

[0102] According to the requirement for bandwidth part change delay time mentioned above, when the terminal receives DCI including bandwidth part change indicator in slot n, the terminal changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T. BWP The completion can be done at a later time, and transmission and reception for the data channel scheduled by the DCI can be performed in the new bandwidth portion that has been changed. When the base station wants to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP ), time domain resource allocation for the data channel can be determined. That is, when the base station schedules the data channel with a new bandwidth portion, the data channel can be scheduled after the bandwidth portion change delay time in the method of determining the time domain resource allocation for the data channel. Accordingly, the terminal can determine whether the DCI instructing the bandwidth portion change is after the bandwidth portion change delay time (TBWP ) may not be expected to indicate a slot offset (K0 or K2) value smaller than that.

[0103] If the terminal receives DCI (e.g., DCI format 1_1 or 0_1) indicating a bandwidth change, the terminal may not perform any transmission or reception during the time period from the third symbol of the slot in which the PDCCH including the DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the terminal receives DCI indicating a bandwidth change in slot n and the slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0104] [CA / DC related]

[0105] FIG. 4 is a diagram illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation, and dual connectivity situation according to one embodiment of the present disclosure.

[0106] Referring to FIG. 4, the wireless protocol of the next-generation mobile communication system is composed of NR SDAP (Service Data Adaptation Protocol S25, S70), NR PDCP (Packet Data Convergence Protocol S30, S65), NR RLC (Radio Link Control S35, S60), and NR MAC (Medium Access Control S40, S55) in the terminal and NR base station, respectively.

[0107] Key features of NR SDAP (S25, S70) may include some of the following:

[0108] - Transfer of user plane data

[0109] - Mapping function between QoS flow and data bearer for both DL and UL

[0110] - Marking function of QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0111] - Ability to map reflective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0112] For the above SDAP layer device, the terminal can be configured by an RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can instruct the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0113] The main functions of NR PDCP (S30, S65) may include some of the following functions:

[0114] - Header compression and decompression (ROHC only)

[0115] - User data transfer function

[0116] - In-sequence delivery of upper layer PDUs

[0117] - Out-of-sequence delivery of upper layer PDUs

[0118] - PDCP PDU reordering for reception

[0119] - Duplicate detection of lower layer SDUs

[0120] - Retransmission function (Retransmission of PDCP SDUs)

[0121] - Encryption and decryption functions (Ciphering and deciphering)

[0122] - Timer-based SDU discard in uplink.

[0123] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order. Alternatively, the reordering function of the NR PDCP device may include a function of transmitting data directly without considering the order, a function of recording lost PDCP PDUs by reordering the order, a function of reporting a status of lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of lost PDCP PDUs.

[0124] The main functions of NR RLC (S35, S60) may include some of the following functions:

[0125] - Data transfer function (Transfer of upper layer PDUs)

[0126] - In-sequence delivery of upper layer PDUs

[0127] - Out-of-sequence delivery of upper layer PDUs

[0128] - ARQ function (Error Correction through ARQ)

[0129] - Concatenation, segmentation and reassembly of RLC SDUs

[0130] - Re-segmentation of RLC data PDUs

[0131] - Reordering of RLC data PDUs

[0132] - Duplicate detection function

[0133] - Protocol error detection

[0134] - RLC SDU discard function

[0135] - RLC re-establishment function

[0136] In the above, the in-sequence delivery function of the NR RLC device refers to the function of sequentially delivering RLC SDUs received from a lower layer to an upper layer. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering a single RLC SDU when it is received divided into multiple RLC SDUs, a function of rearranging received RLC PDUs based on the RLC SN (sequence number) or PDCP SN (sequence number), a function of recording lost RLC PDUs by rearranging the order, a function of reporting the status of lost RLC PDUs to the transmitting side, and a function of requesting retransmission of lost RLC PDUs. The in-sequence delivery function of an NR RLC device may include a function to sequentially deliver to the upper layer only the RLC SDUs up to the lost RLC SDU when there is a lost RLC SDU, or may include a function to sequentially deliver to the upper layer all RLC SDUs received before the timer starts if a predetermined timer has expired even if there is a lost RLC SDU. Alternatively, the in-sequence delivery function of an NR RLC device may include a function to sequentially deliver to the upper layer all RLC SDUs received up to the present if a predetermined timer has expired even if there is a lost RLC SDU.In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a complete RLC PDU, processed, and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0137] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when one RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing and arranging the RLC SN or PDCP SN of received RLC PDUs to record lost RLC PDUs.

[0138] NR MAC (S40, S55) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include some of the following functions.

[0139] - Mapping function (Mapping between logical channels and transport channels)

[0140] - Multiplexing / demultiplexing of MAC SDUs

[0141] - Scheduling information reporting function

[0142] - HARQ function (Error correction through HARQ)

[0143] - Priority handling between logical channels of one UE

[0144] - Priority handling between UEs by means of dynamic scheduling

[0145] - MBMS service identification function

[0146] - Transport format selection function

[0147] - Padding function

[0148] The NR PHY layer (S45, S50) can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it over a wireless channel, or demodulating and channel decoding OFDM symbols received over a wireless channel and transmitting them to a higher layer.

[0149] The above wireless protocol structure can have various detailed structures depending on the carrier (or cell) operation method. For example, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure that has a single structure for each layer, such as S00. On the other hand, when a base station transmits data to a terminal based on CA (carrier aggregation) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure that has a single structure up to RLC, but multiplexes the PHY layer through the MAC layer, such as S10. As another example, when a base station transmits data to a terminal based on DC (dual connectivity) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure that has a single structure up to RLC, but multiplexes the PHY layer through the MAC layer, such as S20.

[0150] [Unified TCI state]

[0151] Hereinafter, a single TCI state indication and activation method based on the unified TCI scheme is described. The unified TCI scheme can refer to a method of integrating and managing the transmission and reception beam management methods, which were distinguished into the TCI state method used for downlink reception of the terminal in the existing Rel-15 and 16 and the spatial relation info method used for uplink transmission, into a TCI state. Therefore, when the terminal is instructed by the base station based on the unified TCI scheme, it can perform beam management using the TCI state even for uplink transmission. If the terminal has set a TCI-State, which is an upper layer signaling with the tci-stateId-r17, which is an upper layer signaling, from the base station, the terminal can perform operations based on the unified TCI scheme using the corresponding TCI-State. The TCI-State can exist in two forms: a joint TCI state or a separate TCI state.

[0152] The first type is a joint TCI state, and the terminal can be instructed by the base station to use both the TCI state to apply to uplink transmission and downlink reception through a single TCI-State. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type1 in the TCI-State based on the joint TCI state to instruct the parameters to use for downlink channel estimation, and the RS corresponding to qcl-Type2 to instruct the parameters to use as a downlink reception beam or reception filter. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL / UL TCI state to instruct the parameters to use as an uplink transmission beam or transmission filter. In this case, if the terminal is instructed to use a joint TCI state, the terminal can apply the same beam to both uplink transmission and downlink reception.

[0153] The second form is a separate TCI state, in which the terminal can be individually instructed by the base station to select a UL TCI state to apply to uplink transmission and a DL TCI state to apply to downlink reception. If the terminal is instructed to select a UL TCI state, the terminal can be instructed to select parameters to use as an uplink transmission beam or transmission filter using the reference RS or source RS configured in the UL TCI state. If the terminal is instructed to select a DL TCI state, the terminal can be instructed to select parameters to use for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the DL TCI state, and to select parameters to use as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2.

[0154] If the terminal is instructed with both the DL TCI state and the UL TCI state, the terminal can be instructed with parameters to be used as an uplink transmission beam or a transmission filter using the reference RS or source RS set in the corresponding UL TCI state, and can be instructed with parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 set in the corresponding DL TCI state, and can be instructed with parameters to be used as a downlink reception beam or a reception filter using the RS corresponding to qcl-Type2. In this case, if the reference RS or source RS set in the DL TCI state and UL TCI state to which the terminal is instructed are different, the terminal can individually apply beams to uplink transmission and downlink reception, respectively, based on the instructed UL TCI state and DL TCI state.

[0155] A terminal can receive a joint TCI state from a base station for each bandwidth part within a specific cell through upper layer signaling up to 128 times, and among the separate TCI states, a DL TCI state can be set for each bandwidth part within a specific cell up to 64 or 128 times through upper layer signaling based on a terminal capability report. Among the separate TCI states, the DL TCI state and the joint TCI state can use the same upper layer signaling structure. For example, if 128 joint TCI states are set and 64 DL TCI states are set among the separate TCI states, the 64 DL TCI states can be included in the 128 joint TCI states.

[0156] Among the separate TCI states, the UL TCI state can be set to a maximum of 32 or 64 upper layer signaling for each specific bandwidth part within a specific cell based on the terminal capability report, and like the relationship between the DL TCI state and the joint TCI state among the separate TCI states, the UL TCI state and the joint TCI state among the separate TCI can also use the same upper layer signaling structure, and the UL TCI state among the separate TCI can use different upper layer signaling structures from the joint TCI state and the DL TCI state among the separate TCI states.

[0157] The use of different or identical upper layer signaling structures may be defined in the specification, or may be distinguished through another upper layer signaling established by the base station based on a terminal capability report containing information on which of the two usage modes the terminal can support.

[0158] The terminal can receive transmission and reception beam-related instructions in an integrated TCI manner using one of the joint TCI state and separate TCI state configured by the base station. The terminal can be configured by the base station via upper layer signaling whether to use either the joint TCI state or separate TCI state.

[0159] The terminal receives transmission / reception beam-related instructions using one of the methods selected from the joint TCI state and the separate TCI state through upper layer signaling. At this time, there may be two transmission / reception beam instruction methods from the base station: a MAC-CE-based instruction method and a MAC-CE-based activation and DCI-based instruction method.

[0160] If a terminal receives a transmission / reception beam-related instruction using a joint TCI state method through upper layer signaling, the terminal can perform a transmission / reception beam application operation by receiving a MAC-CE indicating the joint TCI state from a base station, and the base station can schedule reception of a PDSCH including the MAC-CE through a PDCCH for the terminal. If the MAC-CE includes one joint TCI state, the UE can use the indicated joint TCI state to determine the uplink transmission beam or transmission filter and the downlink reception beam or reception filter starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. If the MAC-CE includes two or more joint TCI states, the UE can confirm that the multiple joint TCI states indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. Then, the UE can receive DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may or may not include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0161] If a terminal receives an instruction related to a transmit / receive beam using a separate TCI state method through upper layer signaling, the terminal can perform a transmit / receive beam application operation by receiving a MAC-CE indicating a separate TCI state from a base station, and the base station can schedule reception of a PDSCH including the corresponding MAC-CE to the terminal through a PDCCH. If the MAC-CE includes only one set of separate TCI states, the terminal can determine an uplink transmit beam or transmit filter and a downlink receive beam or receive filter using the separate TCI states included in the indicated separate TCI state set starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the corresponding PDSCH was successful. At this time, the separate TCI state set may mean single or multiple separate TCI states that one code point of the TCI state field in DCI format 1_1 or 1_2 can have, and one separate TCI state set may include one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state. If there are two or more separate TCI state sets included in the MAC-CE, the UE may confirm that the multiple separate TCI state sets indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting from 3 ms after transmitting the PUCCH including HARQ-ACK information indicating whether reception for the corresponding PDSCH was successful, and may activate the indicated separate TCI state set.At this time, each code point of the TCI state field of DCI format 1_1 or 1_2 can indicate one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state each. The terminal can receive DCI format 1_1 or 1_2 and apply a separate set of TCI states indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0162] FIG. 5 is a diagram illustrating beam application times that may be considered when using an integrated TCI scheme in a wireless communication system according to an embodiment of the present disclosure. As described above, a terminal may receive DCI format 1_1 or 1_2 from a base station, including (with DL assignment) or not including (without DL assignment) downlink data channel scheduling information, and apply one joint TCI state or a set of separate TCI states indicated by the TCI state field in the corresponding DCI to uplink transmission and downlink reception beams.

[0163] - DCI format 1_1 or 1_2 with DL assignment (500): If the terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from the base station (501) and indicates one joint TCI state or a separate TCI state set based on the integrated TCI method, the terminal receives a PDSCH scheduled based on the received DCI (505), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH is successful (510). At this time, the HARQ-ACK can include the meaning of whether reception of both the DCI and the PDSCH is successful, and if at least one of the DCI and the PDSCH is not received, the terminal can transmit a NACK, and if reception of both is successful, the terminal can transmit an ACK.

[0164] - DCI format 1_1 or 1_2 without DL assignment (550): If the terminal receives DCI format 1_1 or 1_2 from the base station that does not include downlink data channel scheduling information (555) and indicates one joint TCI state or a set of separate TCI states based on the integrated TCI method, the terminal may assume at least one combination of the following for the corresponding DCI.

[0165] ■ Includes scrambled CRC using CS-RNTI.

[0166] ■ The value of all bits assigned to all fields used as RV (Redundancy Version) fields is 1.

[0167] ■ The value of all bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields is 1.

[0168] ■ The value of all bits assigned to all fields used as NDI (New Data Indication) fields is 0.

[0169] ■ For FDRA (Frequency Domain Resource Allocation) Type 0, the value of all bits allocated to the FDRA field is 0, for FDRA Type 1, the value of all bits allocated to the FDRA field is 1, and when the FDRA method is dynamicSwitch, the value of all bits allocated to the FDRA field is 0.

[0170] The terminal can transmit a PUCCH including a HARQ-ACK indicating whether reception was successful for the DCI format 1_1 or 1_2 assuming the above-described matters (560).

[0171] - For both DCI format 1_1 or 1_2 with DL assignment (500) and without DL assignment (550), if a new TCI state indicated through DCI (501, 555) is the same as a TCI state that has already been indicated and applied to an uplink transmission and downlink reception beam, the UE can maintain the previously applied TCI state, and if the new TCI state is different from the previously indicated TCI state, the UE can determine the application time of a joint TCI state or a separate TCI state set that can be indicated from the TCI state field included in the DCI as the time after the first slot (520, 570) after the time equal to BAT (beam application time, 515, 565) after the PUCCH transmission (530, 580), and can use the previously indicated TCI-state until (525, 575) before the corresponding slot (520, 570).

[0172] - For both DCI format 1_1 or 1_2 with DL assignment (500) and without DL assignment (550), the BAT can be set by upper layer signaling based on terminal capability report information as a specific number of OFDM symbols, and the numerology for the BAT and the first slot after the BAT can be determined based on the smallest numerology among all cells to which the joint TCI state or separate TCI state set indicated through the DCI is applied.

[0173] A terminal can apply one joint TCI state indicated via MAC-CE or DCI to reception of control resource sets connected to all terminal-specific search spaces, reception of PDSCHs scheduled as PDCCHs transmitted from the control resource sets, transmission of PUSCHs, and transmission of all PUCCH resources.

[0174] A terminal may apply one separate TCI state set, if one separate TCI state set indicated via MAC-CE or DCI includes one DL TCI state, to reception for control resource sets connected to all terminal-specific search spaces, to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and to all PUSCH and PUCCH resources based on the previously indicated UL TCI state.

[0175] A terminal can apply a separate TCI state set indicated via MAC-CE or DCI to all PUSCH and PUCCH resources if it includes one UL TCI state, and can apply it to reception of control resource sets connected to all terminal-specific search spaces based on previously indicated DL TCI states, and to reception of PDSCH scheduled as PDCCH transmitted from the corresponding control resource set.

[0176] When a separate set of TCI states indicated via MAC-CE or DCI includes one DL TCI state and one UL TCI state, the terminal may apply the DL TCI state to reception for all control resource sets associated with the terminal-specific search space and to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and may apply the UL TCI state to all PUSCH and PUCCH resources.

[0177] [Unified TCI state MAC-CE]

[0178] Hereinafter, a single TCI state indication and activation method based on the integrated TCI scheme is described. The terminal receives a PDSCH including the following MAC-CE from the base station, and from 3 slots after transmitting a HARQ-ACK for the corresponding PDSCH to the base station, the terminal can interpret each code point of the TCI state field in DCI format 1_1 or 1_2 based on the information in the MAC-CE received from the base station. That is, the terminal can activate each entry of the MAC-CE received from the base station to each code point of the TCI state field in DCI format 1_1 or 1_2.

[0179] FIG. 6 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or separate DL or UL TCI state in a wireless communication system according to an embodiment of the present disclosure. The meaning of each field within the MAC-CE structure may be as follows.

[0180] - Serving Cell ID (600): This field can indicate which serving cell the MAC-CE is applied to. The length of this field can be 5 bits. If the serving cell indicated by this field is included in one or more of the upper layer signaling simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0181] - DL BWP ID (605): This field can indicate to which DL BWP the corresponding MAC-CE applies, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0182] - UL BWP ID (610): This field can indicate which UL BWP the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0183] - Pi (615): This field can indicate whether each code point in the TCI state field in DCI format 1_1 or 1_2 has multiple TCI states or a single TCI state. If the value of Pi is 1, it means that the corresponding ith code point has multiple TCI states, which may mean that the corresponding code point may include a separate DL TCI state and a separate UL TCI state. If the value of Pi is 0, it means that the corresponding ith code point has a single TCI state, which may mean that the corresponding code point may include either a joint TCI state, a separate DCI TCI state, or a separate UL TCI state.

[0184] - D / U (620): This field can indicate whether the TCI state ID field in the same octet is a joint TCI state, a separate DL TCI state, or a separate UL TCI state. If this field is 1, the TCI state ID field in the same octet can be a joint TCI state or a separate DL TCI state, and if this field is 0, the TCI state ID field in the same octet can be a separate UL TCI state.

[0185] - TCI state ID (625): This field can indicate a TCI state that can be identified by the upper layer signaling TCI-StateId. If the D / U field is set to 1, this field can be used to express the TCI-StateId, which can be expressed in 7 bits. If the D / U field is set to 0, the MSB (most significant bit) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the upper layer signaling UL-TCIState-Id. The maximum number of TCI states that can be activated can be 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0186] - R: Indicates reserved bit and can be set to 0.

[0187] For the MAC-CE structure of FIG. 6 described above, the terminal can include the third octet including the P1, P2, ..., P8 fields in FIG. 6 in the MAC-CE structure, regardless of whether unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint or separate. In this case, the terminal can perform TCI state activation using the fixed MAC-CE structure regardless of the upper layer signaling set by the base station. As another example, for the MAC-CE structure of FIG. 6 described above, the terminal can omit the third octet including the P1, P2, ..., P8 fields in FIG. 6 when unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint. In this case, the terminal can save up to 8 bits of the payload of the corresponding MAC-CE according to the upper layer signaling set by the base station. In addition, all D / U fields located from the fourth octet to the first bit in Fig. 6 can be regarded as R fields, and all corresponding R fields can be set to 0 bits.

[0188] [CSI resource configuration]

[0189] NR has a Channel State Information (CSI) framework that directs base stations to measure and report channel state information (CSI) for terminals. The NR CSI framework can consist of at least two elements: resource settings and report settings. Report settings can reference at least one ID of resource settings to establish a connection relationship with each other.

[0190] According to one embodiment of the present disclosure, resource settings may include information related to a reference signal (RS) for measuring channel state information by a terminal. The base station may configure at least one resource setting for the terminal. For example, the base station and the terminal may exchange signaling information, such as [Table 4], to convey information regarding resource settings.

[0191] [Table 4]

[0192]

[0193] In [Table 4], the signaling information CSI-ResourceConfig contains information about each resource setting. According to the signaling information, each resource setting may include a resource setting index (csi-ResourceConfigId) or a BWP index (bwp-ID) or a time-domain transmission configuration of the resource (resourceType) or a resource set list (csi-RS-ResourceSetList) including at least one resource set. The time-domain transmission configuration of the resource may be set to aperiodic transmission, semi-persistent transmission or periodic transmission. The resource set list may be a set including a resource set for channel measurement or a set including a resource set for interference measurement. If the resource set list is a set including resource sets for channel measurement, each resource set may include at least one resource, which may be an index of a CSI reference signal (CSI-RS) resource or a synchronization / broadcast channel block (SS / PBCH block, SSB). If the resource set list is a set including resource sets for interference measurement, each resource set may include at least one interference measurement resource (CSI interference measurement, CSI-IM).

[0194] For example, if the resource set includes CSI-RS, the base station and the terminal can exchange signaling information as in [Table 5] to convey information about the resource set.

[0195] [Table 5]

[0196]

[0197] In [Table 5], the signaling information NZP-CSI-RS-ResourceSet contains information about each resource set. According to the signaling information, each resource set contains at least information about a resource set index (nzp-CSI-ResourceSetId) or a set of indexes of CSI-RSs included (nzp-CSI-RS-Resources), and may include part of information about a spatial domain transmission filter of the included CSI-RS resource (repetition) or whether the included CSI-RS resource is used for tracking (trs-Info).

[0198] CSI-RS may be the most representative reference signal included in a resource set. The base station and terminal can exchange signaling information, as shown in [Table 6], to convey information about CSI-RS resources.

[0199] [Table 6]

[0200]

[0201] In [Table 6], the signaling information NZP-CSI-RS-Resource contains information about each CSI-RS. The information contained in the signaling information NZP-CSI-RS-Resource may have the following meanings.

[0202] - nzp-CSI-RS-ResourceId: CSI-RS resource index

[0203] - resourceMapping: Resource mapping information for CSI-RS resources

[0204] - powerControlOffset: Ratio between PDSCH EPRE (Energy Per RE) and CSI-RS EPRE

[0205] - powerControlOffsetSS: Ratio between SS / PBCH block EPRE and CSI-RS EPRE

[0206] - scramblingID: scrambling index of the CSI-RS sequence

[0207] - periodicityAndOffset: Transmission period and slot offset of the CSI-RS resource

[0208] - qcl-InfoPeriodicCSI-RS: TCI-state information if the CSI-RS is a periodic CSI-RS.

[0209] The resourceMapping included in the above signaling information NZP-CSI-RS-Resource indicates resource mapping information of the CSI-RS resource, and may include frequency resource resource element (RE) mapping, number of ports, symbol mapping, CDM type, frequency resource density, and frequency band mapping information. The number of ports, frequency resource density, CDM type, and time-frequency axis RE mapping that can be set through this may have a value set in one of the rows of [Table 7] below.

[0210] [Table 7]

[0211]

[0212] [Table 7] shows the frequency resource density, CDM type, frequency axis of CSI-RS component RE pattern and time axis start position that can be set according to the number of CSI-RS ports (X). , represents the number of frequency-axis REs (k') and the number of time-axis REs (l') of the CSI-RS component RE pattern. The aforementioned CSI-RS component RE pattern may be a basic unit configuring a CSI-RS resource. Through Y=1+max(k') REs on the frequency axis and Z=1+max(l') REs on the time axis, the CSI-RS component RE pattern may be composed of YZ REs. When the number of CSI-RS ports is 1 port, the CSI-RS RE position may be designated without limitation of subcarriers in a PRB (Physical Resource Block), and the CSI-RS RE position may be designated by a 12-bit bitmap. When the number of CSI-RS ports is {2, 4, 8, 12, 16, 24, 32} ports and Y=2, CSI-RS RE positions can be specified for every two subcarriers in the PRB, and the CSI-RS RE positions can be specified by a 6-bit bitmap. When the number of CSI-RS ports is 4 ports and Y=4, CSI-RS RE positions can be specified for every four subcarriers in the PRB, and the CSI-RS RE positions can be specified by a 3-bit bitmap. Similarly, time axis RE positions can be specified by a bitmap of a total of 14 bits.

[0213] [CSI report configuration]

[0214] According to one embodiment of the present disclosure, a report setting can have a connection relationship with at least one ID of a resource setting by referencing the ID of the resource setting, and the resource setting(s) having a connection relationship with the report setting provide configuration information including information on a reference signal for measuring channel information. When the resource setting(s) having a connection relationship with the report setting are used for measuring channel information, the measured channel information can be used for reporting channel information according to a reporting method set in the report setting having the connection relationship.

[0215] According to one embodiment of the present disclosure, report settings may include configuration information related to a CSI reporting method. For example, a base station and a terminal may exchange signaling information as shown in [Table 8] to convey information regarding report settings.

[0216] [Table 8]

[0217]

[0218]

[0219]

[0220] In [Table 8], the signaling information CSI-ReportConfig contains information about each report setting. The information contained in the signaling information CSI-ReportConfig may have the following meanings.

[0221] - reportConfigId: report setting index

[0222] - carrier: serving cell index

[0223] - resourcesForChannelMeasurement: resource setting index for channel measurement that has a relationship with report settings

[0224] - csi-IM-ResourcesForInterference: Resource setting index containing CSI-IM resources for interference measurement that have a relationship with report settings.

[0225] - nzp-CSI-RS-ResourcesForInterference: Resource setting index containing CSI-RS resources for interference measurement that are linked to report settings.

[0226] - reportConfigType: Indicates the time axis transmission settings and transmission channel of the channel report, and can have aperiodic transmission or semi-persistent PUCCH (Physical Uplink Control Channel) transmission or semi-periodic PUSCH transmission or periodic transmission settings.

[0227] - reportQuantity: Indicates the type of channel information to be reported. It can have the types of channel information ('cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', 'cri-RSRP', 'ssb-Index-RSRP', 'cri-RI-LI-PMI-CQI') when no channel report is transmitted and when a channel report is transmitted. Here, the elements included in the types of channel information mean CQI (Channel Quality Indicator), PMI (Precoding Matric Indicator), CRI (CSI-RS Resource Indicator), SSBRI (SS / PBCH block Resource Indicator), Layer Indicator(LI), Rank Indicator(RI), and / or L1-RSRP (Reference Signal Received Power).

[0228] - reportFreqConfiguration: Indicates whether the channel information being reported includes only information about the entire wideband or information about each subband. If it includes information about each subband, it can have configuration information about the subband that contains the channel information.

[0229] - timeRestrictionForChannelMeasurements: Whether the reference signal for channel measurement among the reference signals referenced by the reported channel information has a time axis restriction.

[0230] - timeRestrictionForInterferenceMeasurements: Whether the time axis of the reference signal for interference measurement is restricted among the reference signals referenced by the reported channel information.

[0231] - codebookConfig: Codebook information referenced by the channel information being reported

[0232] - groupBasedBeamReporting: Whether to group beams in channel reporting

[0233] - cqi-Table: CQI table index referenced by the reported channel information

[0234] - subbandSize: Index indicating the subband size of channel information

[0235] - non-PMI-PortIndication: Port mapping information referenced when reporting non-PMI channel information.

[0236] When the base station instructs channel information reporting through upper layer signaling or L1 signaling, the terminal can perform channel information reporting by referring to the above-mentioned configuration information included in the instructed report setting.

[0237] The base station can instruct the terminal to report channel state information (CSI) through upper layer signaling, including RRC (Radio Resource Control) signaling or MAC (Medium Access Control) CE (Control Element) signaling, or L1 signaling (e.g., common DCI, group-common DCI, terminal-specific DCI).

[0238] For example, a base station can instruct a terminal to perform an aperiodic channel information report (CSI report) through higher layer signaling or DCI using DCI format 0_1. The base station sets a parameter for the aperiodic CSI report of the terminal, or a plurality of CSI report trigger states including parameters for the CSI report, through higher layer signaling. The parameters for the CSI report or the CSI report trigger states can include a set including a slot interval or a possible slot interval between a PDCCH including the DCI and a PUSCH including the CSI report, a reference signal ID for channel state measurement, a type of channel information to be included, etc. When the base station instructs the terminal to perform some of the multiple CSI report trigger states through the DCI, the terminal reports channel information according to the CSI report settings of the report settings set in the instructed CSI report trigger states. The channel information reporting can be performed through a PUSCH scheduled with DCI format 0_1. The time domain resource allocation of the PUSCH including the CSI report of the terminal can be performed through the slot interval with the PDCCH indicated through the DCI, the start symbol and symbol length indication within the slot for the time domain resource allocation of the PUSCH, etc. For example, the position of the slot in which the PUSCH including the CSI report of the terminal is transmitted can be indicated through the slot interval with the PDCCH indicated through the DCI, and the start symbol and symbol length within the slot can be indicated through the time domain resource assignment field of the DCI described above.

[0239] For example, a base station can instruct a terminal to transmit a semi-persistent CSI report on the PUSCH via DCI using DCI format 0_1. The base station can activate or deactivate the semi-persistent CSI report transmitted on the PUSCH via DCI scrambled with SP-CSI-RNTI. When the semi-persistent CSI report is activated, the terminal can periodically report channel information according to the configured slot interval. When the semi-persistent CSI report is deactivated, the terminal can stop the activated periodic channel information reporting. The base station configures a parameter for the terminal's semi-persistent CSI report or multiple CSI report trigger states including the parameters for the semi-persistent CSI report through upper layer signaling. Parameters for a CSI report, or a CSI report trigger state, may include a set including a slot interval or possible slot intervals between a PDCCH including DCI indicating a CSI report and a PUSCH including the CSI report, a slot interval between a slot in which upper layer signaling indicating a CSI report is activated and a PUSCH including the CSI report, a slot interval period of the CSI report, a type of channel information included, etc. When a base station activates some of a plurality of CSI report trigger states or some of a plurality of report settings for a terminal through upper layer signaling or DCI, the terminal may report channel information according to a report setting included in the indicated CSI report trigger state or a CSI report setting set in the activated report setting.The above channel information reporting can be performed through a PUSCH that is semi-persistently scheduled with DCI format 0_1 ​​scrambled with SP-CSI-RNTI. The time domain resource allocation of the PUSCH including the CSI report of the terminal can be performed through the slot interval period of the CSI report, the slot interval with respect to the slot in which upper layer signaling is activated, the slot interval with respect to the PDCCH indicated through DCI, the start symbol and symbol length indication within the slot for time domain resource allocation of the PUSCH, etc. For example, the position of the slot in which the PUSCH including the CSI report of the terminal is transmitted can be indicated through the slot interval with respect to the PDCCH indicated through DCI, and the start symbol and symbol length within the slot can be indicated through the time domain resource assignment field of the DCI format 0_1 ​​described above.

[0240] For example, a base station can instruct a terminal to transmit a semi-persistent CSI report to a PUCCH through upper layer signaling such as MAC-CE. Through the MAC-CE signaling, the base station can activate or deactivate the semi-persistent CSI report transmitted to the PUCCH. When the semi-persistent CSI report is activated, the terminal can periodically report channel information according to the configured slot interval. When the semi-persistent CSI report is deactivated, the terminal can stop the activated periodic channel information reporting. The base station configures parameters for the semi-persistent CSI report of the terminal through upper layer signaling. The parameters for the CSI report can include a PUCCH resource through which the CSI report is transmitted, a slot interval period of the CSI report, the type of channel information included, etc. The terminal can transmit the CSI report through the PUCCH. Alternatively, if the PUCCH for the CSI report overlaps with the PUSCH, the CSI report can be transmitted through the PUSCH. The location of the PUCCH transmission slot including the CSI report can be indicated through the slot interval period of the CSI report set through upper layer signaling, the slot interval between the slot in which the upper layer signaling is activated and the PUCCH including the CSI report, and the start symbol and symbol length within the slot can be indicated through the start symbol and symbol length to which the PUCCH resource is allocated set through upper layer signaling.

[0241] For example, a base station can instruct a terminal to perform a periodic CSI report through upper layer signaling. The base station can activate or deactivate the periodic CSI report through upper layer signaling including RRC signaling. When the periodic CSI report is activated, the terminal can periodically report channel information according to a configured slot interval. When the periodic CSI report is deactivated, the terminal can stop the activated periodic channel information reporting. The base station configures a report setting including parameters for the terminal's periodic CSI report through upper layer signaling. The parameters for the CSI report can include a PUCCH resource setting for the CSI report, a slot interval between a slot in which upper layer signaling indicating the CSI report is activated and a PUCCH including the CSI report, a slot interval period of the CSI report, a reference signal ID for channel state measurement, the type of channel information included, etc. The terminal can transmit the CSI report through the PUCCH. Alternatively, if the PUCCH for the CSI report overlaps with the PUSCH, the CSI report can be transmitted on the PUSCH. The position of the slot in which the PUCCH including the CSI report is transmitted can be indicated through the slot interval period of the CSI report set through upper layer signaling, the slot interval between the slot in which the upper layer signaling is activated and the PUCCH including the CSI report, and the start symbol and symbol length within the slot can be indicated through the start symbol and symbol length to which the PUCCH resource is allocated set through upper layer signaling.

[0242] For the aforementioned CSI report setting (CSI-ReportConfig), each report setting CSI-ReportConfig can be associated with one downlink (DL) bandwidth part identified by the upper layer parameter bandwidth part identifier (bwp-id) given by the CSI resource setting, CSI-ResourceConfig, associated with the corresponding report setting. For the time domain reporting operation for each report setting CSI-ReportConfig, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, which can be configured from the base station to the terminal by the reportConfigType parameter configured from the upper layer. The semi-persistent CSI reporting method supports 'PUCCH-based semi-persistent (semi-PersistentOnPUCCH)' and 'PUSCH-based semi-persistent (semi-PersistentOnPUSCH)'. For periodic or semi-permanent CSI reporting methods, the UE can receive PUCCH or PUSCH resources for transmitting CSI from the base station through higher-layer signaling. The period and slot offset of the PUCCH or PUSCH resources for transmitting CSI can be given as numerology of the uplink (UL) bandwidth portion configured for CSI report transmission. For aperiodic CSI reporting methods, the UE can receive scheduling of PUSCH resources for transmitting CSI from the base station through L1 signaling (the aforementioned DCI format 0_1).

[0243] For the aforementioned CSI resource settings (CSI-ResourceConfig), each CSI resource setting CSI-ReportConfig A CSI resource set (given by the higher layer parameter csi-RS-ResourceSetList) may be included. The CSI resource set list may consist of a non-zero power (NZP) CSI-RS resource set and a SS / PBCH block set, or a CSI-interference measurement (CSI-IM) resource set. Each CSI resource setting may be located in a downlink (DL) bandwidth segment identified by the higher layer parameter bwp-id, and a CSI resource setting may be linked to a CSI reporting setting in the same downlink bandwidth segment. The time domain operation of the CSI-RS resources within a CSI resource setting may be set to one of 'aperiodic', 'periodic', or 'semi-persistent' from the higher layer parameter resourceType. For periodic or semi-permanent CSI resource settings, the number of CSI-RS resource sets can be limited to S=1, and the configured period and slot offset can be given as a numerology of a downlink bandwidth portion identified by bwp-id. A terminal can receive one or more CSI resource settings for channel or interference measurement from a base station through higher layer signaling, and may include, for example, the following CSI resources.

[0244] - CSI-IM resources for interference measurements

[0245] - NZP CSI-RS resources for interference measurements

[0246] - NZP CSI-RS resources for channel measurements

[0247] For CSI-RS resource sets associated with resource settings where the upper layer parameter resourceType is set to 'aperiodic', 'periodic', or 'semi-persistent', the trigger state for the CSI report setting where reportType is set to 'aperiodic' and the resource settings for channel or interference measurements for one or more component cells (CCs) can be set with the upper layer parameter CSI-AperiodicTriggerStateList.

[0248] Aperiodic CSI reporting of a terminal can utilize PUSCH, periodic CSI reporting can utilize PUCCH, and semi-persistent CSI reporting can be performed using PUSCH when triggered or activated by DCI, or PUCCH after activation by MAC control element (MAC CE). As mentioned above, CSI resource settings can also be configured as aperiodic, periodic, or semi-persistent. Combinations between CSI reporting settings and CSI resource settings can be supported based on [Table 9] below.

[0249] [Table 9]

[0250]

[0251] Aperiodic CSI reporting can be triggered by the "CSI request" field of the aforementioned DCI format 0_1 ​​corresponding to scheduling DCI for PUSCH. The UE can monitor the PDCCH, acquire the DCI format 0_1, and acquire scheduling information and a CSI request indicator for the PUSCH. The CSI request indicator can be set to NTS (=0, 1, 2, 3, 4, 5, or 6) bits and can be determined by higher layer signaling (reportTriggerSize). One of one or more aperiodic CSI reporting trigger states that can be set by higher layer signaling (CSI-AperiodicTriggerStateList) can be triggered by the CSI request indicator.

[0252] - If all bits in the CSI request field are 0, this may mean that no CSI report is requested.

[0253] - If the number of CSI trigger states (M) in the configured CSI-AperiodicTriggerStateLite is greater than 2NTs-1, M CSI trigger states can be mapped to 2NTs-1 according to the mapping relationship defined, and one of the trigger states of 2NTs-1 can be indicated by the CSI request field.

[0254] - If the number of CSI trigger states (M) in the configured CSI-AperiodicTriggerStateLite is less than or equal to 2NTs-1, one of the M CSI trigger states can be indicated by the CSI request field.

[0255] [Table 10] below shows an example of the relationship between a CSI request indicator and the CSI trigger state that can be indicated by the indicator.

[0256] [Table 10]

[0257]

[0258] A terminal may perform measurement on a CSI resource within a CSI trigger state triggered by a CSI request field, and may generate CSI (including at least one of the aforementioned CQI, PMI, CRI, SSBRI, LI, RI, or L1-RSRP) therefrom. The terminal may transmit the acquired CSI using a PUSCH scheduled by the corresponding DCI format 0_1. If 1 bit corresponding to the uplink data indicator (UL-SCH indicator) in the DCI format 0_1 ​​indicates "1", uplink data (UL-SCH) and the acquired CSI may be multiplexed and transmitted on the PUSCH resource scheduled by the DCI format 0_1. If 1 bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​indicates "0", only CSI can be mapped and transmitted without uplink data (UL-SCH) to the PUSCH resource scheduled by DCI format 0_1.

[0259] Figure 7 is a diagram illustrating an example of an aperiodic CSI reporting method.

[0260] In an example (700) of FIG. 7, the terminal can monitor the PDCCH (701) to obtain DCI format 0_1, from which it can obtain scheduling information and CSI request information for the PUSCH (705). The terminal can obtain resource information for the CSI-RS (702) to be measured from the received CSI request indicator. The terminal can determine when to perform measurement on the transmitted CSI-RS (702) resource based on the time point of receiving DCI format 0_1 ​​and the parameter (aperiodicTriggeringOffset described above) for the offset in the CSI resource set configuration (e.g., NZP CSI-RS resource set configuration (NZP-CSI-RS-ResourceSet)). More specifically, the terminal can receive an offset value X of the parameter aperiodicTriggeringOffset in the NZP-CSI-RS resource set configuration from the base station through upper layer signaling, and the set offset value X can mean an offset between a slot in which a DCI that triggers aperiodic CSI reporting is received and a slot in which a CSI-RS resource is transmitted. For example, the aperiodicTriggeringOffset parameter value and the offset value X can have a mapping relationship described in [Table 11] below.

[0261] [Table 11]

[0262]

[0263] An example (700) of Fig. 7 shows an example in which the aforementioned offset value is set to X=0. In this case, the terminal can receive the CSI-RS (702) in a slot (corresponding to slot 0 (706) of Fig. 7) in which the DCI format 0_1 ​​that triggers the aperiodic CSI report is received, and can report the CSI information measured with the received CSI-RS to the base station through the PUSCH (705). The terminal can obtain scheduling information (information corresponding to each field of the aforementioned DCI format 0_1) for the PUSCH (705) for CSI reporting from the DCI format 0_1. As an example, the terminal can obtain information on a slot in which the PUSCH (705) is to be transmitted from the aforementioned time domain resource allocation information for the PUSCH (705) in the DCI format 0_1. In an example (700) of FIG. 7, the terminal acquires a K2 value corresponding to a slot offset value for PDCCH-to-PUSCH as 3, and accordingly, the PUSCH (705) can be transmitted in slot 3 (709), which is 3 slots away from slot 0 (706), at the time when the PDCCH (701) is received.

[0264] In an example (710) of FIG. 7, the terminal can monitor the PDCCH (711) to obtain DCI format 0_1, and from this, can obtain scheduling information and CSI request information for the PUSCH (715). The terminal can obtain resource information for the CSI-RS (712) to be measured from the received CSI request indicator. An example (710) of FIG. 7 shows an example in which the offset value for the aforementioned CSI-RS is set to X=1. In this case, the terminal can receive the CSI-RS (712) in a slot (corresponding to slot 0 (716) of FIG. 7) in which the DCI format 0_1 ​​that triggers aperiodic CSI reporting is received, and can report the CSI information measured with the received CSI-RS to the base station through the PUSCH (715).

[0265] An aperiodic CSI report may include at least one or both of CSI part 1 and CSI part 2, and when the aperiodic CSI report is transmitted via PUSCH, it may be multiplexed with a transport block. For multiplexing, a CRC is inserted into the input bits of the aperiodic CSI, and after encoding and rate matching, it may be mapped to a resource element in the PUSCH in a specific pattern and transmitted. The CRC insertion may be omitted depending on the coding method or the length of the input bits. The number of modulation symbols calculated for rate matching when multiplexing CSI Part 1 or CSI part 2 included in the aperiodic CSI report may be calculated as shown in [Table 12] below.

[0266] [Table 12]

[0267]

[0268]

[0269] In particular, in the case of PUSCH repetition transmission methods A and B, the UE can transmit the aperiodic CSI report by multiplexing it only in the first repetition transmission among the PUSCH repetition transmissions. This is because the aperiodic CSI report information to be multiplexed is encoded in a polar code manner, and in this case, in order to be multiplexed in multiple PUSCH repetitions, each PUSCH repetition must have the same frequency and time resource allocation. In particular, in the case of PUSCH repetition type B, each actual repetition can have a different OFDM symbol length, so the aperiodic CSI report can be multiplexed and transmitted only in the first PUSCH repetition.

[0270] In addition, for PUSCH repetition transmission scheme B, if the UE schedules aperiodic CSI reporting without scheduling a transport block or receives a DCI activating semi-persistent CSI reporting, the nominal repetition value may be assumed to be 1 even if the number of PUSCH repetition transmissions configured by upper layer signaling is greater than 1. In addition, if the UE schedules or activates aperiodic or semi-persistent CSI reporting without scheduling a transport block based on PUSCH repetition transmission scheme B, the UE may expect the first nominal repetition to be the same as the first actual repetition. For a PUSCH transmitted including semi-persistent CSI based on PUSCH repetition transmission scheme B without scheduling a DCI after semi-persistent CSI reporting is activated by DCI, if the first nominal repetition is different from the first actual repetition, the transmission for the first nominal repetition may be ignored.

[0271] [CSI computation time]

[0272] When a base station instructs a terminal to perform an aperiodic CSI report or a semi-persistent CSI report through DCI, the terminal can determine whether or not a valid channel report can be performed through the instructed CSI report by considering the channel calculation time (CSI computation time) required for the CSI report. For an aperiodic CSI report or a semi-persistent CSI report instructed through DCI, the terminal can perform a valid CSI report starting from the uplink symbol following the Z symbol after the last symbol included in the PDCCH including the DCI instructing the CSI report. The Z symbol described above may vary depending on the numerology of the downlink bandwidth part to which the PDCCH including the DCI instructing the CSI report corresponds, the numerology of the uplink bandwidth part to which the PUSCH transmitting the CSI report corresponds, and the type or characteristics (report quantity, frequency band granularity, number of ports of the reference signal, codebook type, etc.) of channel information reported in the CSI report. In other words, in order for a CSI report to be judged as a valid CSI report (if the CSI report is a valid CSI report), the uplink transmission of the CSI report must not be performed before the Zref symbol, including the timing advance. In this case, the Zref symbol is the time starting from the moment when the last symbol of the triggering PDCCH ends. This is the uplink symbol that starts the CP (cyclic prefix). Here, the detailed value of Z is as described below. and is numerology. At this time Is The largest of It can be promised that it will use what causes the value, is the subcarrier spacing used for PDCCH transmission, is the subcarrier spacing used for CSI-RS transmission, may refer to the subcarrier spacing of the uplink channel used for transmitting UCI (Uplink control information) for CSI reporting. As another example, Is The largest of It is also possible to promise to use something that causes a value. and The definition of is referred to above. For convenience of future explanation, satisfying the above conditions is referred to as satisfying CSI reporting validity condition 1.

[0273] In addition, if the reference signal for channel measurement for an aperiodic CSI report indicated to a terminal through DCI is an aperiodic reference signal, a valid CSI report can be performed starting from the uplink symbol after the Z' symbol after the last symbol including the reference signal ends, and the above-mentioned Z' symbol may vary depending on the numerology of the downlink bandwidth part corresponding to the PDCCH including the DCI indicating the CSI report, the numerology of the bandwidth corresponding to the reference signal for channel measurement for the CSI report, the numerology of the uplink bandwidth part corresponding to the PUSCH transmitting the CSI report, and the type or characteristics of the channel information reported in the CSI report (report quantity, frequency band granularity, number of ports of the reference signal, codebook type, etc.). In other words, in order for a CSI report to be determined to be a valid CSI report (if the CSI report is a valid CSI report), the uplink transmission of the CSI report must not be performed before the Zref' symbol, including the timing advance. At this time, the Zref' symbol starts from the moment when the last symbol of the aperiodic CSI-RS or aperiodic CSI-IM triggered by the triggering PDCCH ends. This is an uplink symbol that starts CP (cyclic prefix). Here, the detailed value of Z' is explained below. and is numerology. At this time Is The largest of It can be promised that it will use what causes the value, is the subcarrier spacing used for triggering PDCCH transmission, is the subcarrier spacing used for CSI-RS transmission, may refer to the subcarrier spacing of the uplink channel used for transmitting UCI (Uplink control information) for CSI reporting. As another example, Is The largest of It can be promised that the value will be used. At this time, and The definition of is referred to above. For convenience of future explanation, satisfying the above conditions is referred to as satisfying CSI reporting validity condition 2.

[0274] If the base station instructs the terminal to perform an aperiodic CSI report for an aperiodic reference signal through DCI, the terminal can perform a valid CSI report starting from the first uplink symbol that satisfies both the point in time Z symbols after the last symbol included in the PDCCH including the DCI indicating the CSI report and the point in time Z' symbols after the last symbol including the reference signal. That is, in the case of aperiodic CSI reporting based on the aperiodic reference signal, both CSI reporting validity conditions 1 and 2 must be satisfied to be considered a valid CSI report.

[0275] If the CSI report time indicated by the base station does not satisfy the CSI computation time requirement, the terminal may determine the CSI report to be invalid and may not consider updating the channel information status for the CSI report.

[0276] The Z, Z' symbols for calculating the CSI computation time mentioned above follow [Table 13] and [Table 14] below. For example, if the channel information reported in the CSI report includes only wideband information, the number of ports of the reference signal is 4 or less, there is one reference signal resource, and the codebook type is 'typeI-SinglePanel' or the type of channel information to be reported (report quantity) is 'cri-RI-CQI', the Z, Z' symbols follow [Table 14]. follows the value. This will be referred to as delay requirement 2 in the future. In addition, if the PUSCH containing the CSI report does not contain TB or HARQ-ACK and the CPU occupation of the terminal is 0, the Z and Z' symbols are as in [Table 13]. The value is followed and is named as delay requirement 1. The description of the CPU occupation mentioned above is described in detail below. In addition, when the report quantity is 'cri-RSRP' or 'ssb-Index-RSRP', the Z, Z' symbols are as shown in [Table 14]. Follow the values. X1, X2, X3, and X4 in [Table 14] represent the UE capability for beam reporting time, and KB1 and KB2 in [Table 14] represent the UE capability for beam change time. In case it does not correspond to the type or characteristic of channel information reported in the above-mentioned CSI report, the Z and Z' symbols are in [Table 14]. Follow the value.

[0277] [Table 13]

[0278]

[0279] [Table 14]

[0280]

[0281] [CSI reference resource]

[0282] When a base station instructs a terminal to perform an aperiodic / semi-persistent / periodic CSI report, it may configure a CSI reference resource to determine a reference time and frequency for a channel to be reported in the CSI report. The frequency of the CSI reference resource may be the carrier and subband information for measuring CSI, which are indicated in the CSI report configuration, and these may correspond to the carrier and reportFreqConfiguration in the upper layer signaling, CSI-ReportConfig, respectively. The time of the CSI reference resource may be defined based on the time at which the CSI report is transmitted. For example, when instructing to transmit CSI report #X in the uplink slot n' of the carrier and BWP where the CSI report is to be transmitted, the time of the CSI reference resource of CSI report #X may be defined as the carrier on which the CSI report is to be transmitted and the downlink slot n of the BWP, n-nCSI-ref. Downlink slot n is named as μDL for the carrier measuring CSI and the numerology of BWP, and μUL for the carrier transmitting CSI report #X and the numerology of BWP. It is calculated as follows. The slot interval between the downlink slot n and the CSI reference signal, nCSI-ref, is the number of CSI-RS / SSB resources for channel measurement when the CSI report #X transmitted in the uplink slot n' is a semi-persistent or periodic CSI report. If a single CSI-RS / SSB resource is connected to the corresponding CSI report, , and if multiple CSI-RS / SSB resources are connected to the corresponding CSI report. If the CSI report #X transmitted in uplink slot n' is an aperiodic CSI report, the CSI computation time Z' for channel measurement is considered. is calculated as mentioned above is the number of symbols contained in one slot, and in NR Assume that.

[0283] When a base station instructs a terminal to transmit a CSI report in uplink slot n' through upper layer signaling or DCI, the terminal may report CSI by performing channel measurement or interference measurement on a CSI-RS resource, CSI-IM resource, or SSB resource that is transmitted no later than the CSI reference resource slot of the CSI report transmitted in uplink slot n' among the CSI-RS resources, CSI-IM, or SSB resources associated with the CSI report. The CSI-RS resource, CSI-IM resource, or SSB resource associated with the above-mentioned CSI report may mean a CSI-RS resource, CSI-IM resource, or SSB resource included in a resource set set in a resource setting referenced by a report setting for a CSI report of a terminal set through upper layer signaling, or a CSI-RS resource, CSI-IM resource, or SSB resource referenced by a CSI report trigger state including parameters for the CSI report, or a CSI-RS resource, CSI-IM resource, or SSB resource indicated by an ID of a reference signal (RS) set.

[0284] In embodiments of the present disclosure, a CSI-RS / CSI-IM / SSB occasion refers to a transmission time of CSI-RS / CSI-IM / SSB resource(s) determined by a higher layer configuration or a combination of the higher layer configuration and DCI triggering. For example, a semi-persistent or periodic CSI-RS resource determines a slot to be transmitted according to a slot period and slot offset configured by higher layer signaling, and the transmission symbol(s) within the slot are determined according to resource mapping information (resourceMapping). As another example, an aperiodic CSI-RS resource determines a slot to be transmitted according to a slot offset from a PDCCH including a DCI indicating channel reporting configured by higher layer signaling, and the transmission symbol(s) within the slot are determined according to resourceMapping information.

[0285] The above-mentioned CSI-RS occasion can be determined by independently considering the transmission time of each CSI-RS resource or by comprehensively considering the transmission time of one or more CSI-RS resource(s) included in the resource set, and accordingly, the following two interpretations are possible for the CSI-RS occasion according to each resource set configuration.

[0286] - Interpretation 1-1: From the start time of the earliest symbol to the end time of the latest symbol in which one or more specific resources among the CSI-RS resources included in the resource set(s) set in the resource setting referenced by the report setting set for the CSI report are transmitted.

[0287] - Interpretation 1-2: From the start time of the earliest symbol transmitted by the CSI-RS resource to the end time of the latest symbol transmitted by the CSI-RS resource among all CSI-RS resources included in the resource set(s) set in the resource setting referenced by the report setting set for the CSI report.

[0288] In the embodiments of the present disclosure below, it is possible to consider both interpretations of CSI-RS occasions and apply them individually. Furthermore, it is possible to consider both interpretations for CSI-IM occasions and SSB occasions, similar to CSI-RS occasions. However, since the principles are similar to those described above, any redundant explanation will be omitted below.

[0289] In embodiments of the present disclosure, 'CSI-RS / CSI-IM / SSB occasion' for CSI report #X transmitted in 'uplink slot n' means a set of CSI-RS occasions, CSI-IM occasions, and SSB occasions that are not later than the CSI reference resource of CSI report #X transmitted in 'uplink slot n' among CSI-RS resources, CSI-IM resources, and SSB resources included in a resource set set in a resource setting referenced by a report setting set for CSI report #X.

[0290] In the embodiments of the present disclosure, the latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in 'uplink slot n' can be interpreted in the following two ways.

[0291] - Interpretation 2-1: A set of occasions including the latest CSI-RS occasion among the CSI-RS occasions for CSI report #X transmitted in uplink slot n', the latest CSI-IM occasion among the CSI-RS occasions for CSI report #X transmitted in uplink slot n', and the latest SSB occasion among the SSB occasions for CSI report #0 transmitted in uplink slot n'.

[0292] - Interpretation 2-2: The latest occasion among all CSI-RS occasions, CSI-IM occasions, and SSB occasions for CSI report #X transmitted in uplink slot n'

[0293] In the embodiments of the present disclosure, it is possible to individually apply both interpretations of the "latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in uplink slot n". In addition, when the two interpretations (Interpretation 1-1, Interpretation 1-2) for the CSI-RS occasion, CSI-IM occasion, and SSB occasion described above are considered, in the embodiments of the present disclosure, it is possible to individually apply the "latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in uplink slot n" by considering all four different interpretations (applying Interpretation 1-1 and Interpretation 2-1, applying Interpretation 1-1 and Interpretation 2-2, applying Interpretation 1-2 and Interpretation 2-1, applying Interpretation 1-2 and Interpretation 2-2).

[0294] The base station can instruct the CSI report by considering the amount of channel information that the terminal can calculate simultaneously for the CSI report, i.e. the number of channel information calculation units (CSI processing units, CPUs) of the terminal. The number of channel information calculation units that the terminal can calculate simultaneously If you say so, the terminal Do not expect CSI report instructions from base stations that require more channel information calculations, or We may not consider updating channel information that requires more channel information calculations. The terminal can report to the base station through upper layer signaling or the base station can set it through upper layer signaling.

[0295] The CSI report that the base station instructs the terminal is the total number of channel information that the terminal can calculate simultaneously. It is assumed that some or all of the CPU is used for calculating channel information. For each CSI report, for example, a CSI report The number of channel information calculation units required for Then, the number of channel information calculation units required for a total of N CSI reports is It can be said that. The calculation unit of channel information required for each reportQuantity set in the CSI report can be set as shown in [Table 15] below.

[0296] [Table 15]

[0297]

[0298] The number of channel information calculations required by a terminal for multiple CSI reports at a given point in time is the number of channel information calculation units that the terminal can calculate simultaneously. If there are more than this, the terminal may not consider updating channel information for some CSI reports. Among the multiple indicated CSI reports, the CSI reports that do not consider updating channel information are determined at least by considering the CPU time required for calculating channel information for the CSI report and the priority of the channel information being reported. For example, the channel information update may not be considered for the CSI report whose channel information calculation requires the latest CPU time, and it is also possible to preferentially not consider updating channel information for CSI reports with lower channel information priorities.

[0299] The priority of the above channel information can be determined by referring to [Table 16] below.

[0300] [Table 16]

[0301]

[0302] The CSI priority for a CSI report is determined through the priority value PriiCSI(y,k,c,s) in [Table 16]. Referring to [Table 16], the CSI priority value is determined through the type of channel information included in the CSI report, the time axis reporting characteristics of the CSI report (aperiodic, semi-persistent, periodic), the channel on which the CSI report is transmitted (PUSCH, PUCCH), the serving cell index, and the CSI report configuration index. The CSI priority for a CSI report is determined by comparing the priority values ​​PriiCSI(y,k,c,s) and determining that the CSI priority for a CSI report with a smaller priority value is higher.

[0303] If the time taken by the CPU to calculate the channel information required for the CSI report instructed by the base station to the terminal is called CPU occupation time, then the CPU occupation time is determined by considering the type of channel information included in the CSI report (report quantity), the time axis characteristics of the CSI report (aperiodic, semi-persistent, periodic), the slot or symbol occupied by the upper layer signaling or DCI indicating the CSI report, and part or all of the slot or symbol occupied by the reference signal for channel state measurement.

[0304] [PDCCH: DCI related]

[0305] Next, we will specifically explain downlink control information (DCI) in 5G systems.

[0306] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields defined between the base station and the terminal, and the non-fallback DCI format can include configurable fields.

[0307] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after going through the channel coding and modulation process. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process. When the UE receives a DCI message transmitted on the PDCCH, it verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can determine that the message was transmitted to the UE.

[0308] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a Paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0309] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 17] below.

[0310] [Table 17]

[0311]

[0312] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include, for example, the information in [Table 18] below.

[0313] [Table 18]

[0314]

[0315]

[0316] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 19] below.

[0317] [Table 19]

[0318]

[0319] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 20] below.

[0320] [Table 20]

[0321]

[0322] [PDCCH: CORESET, REG, CCE, Search Space]

[0323] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0324] FIG. 8 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. FIG. 8 illustrates an example in which two control regions (Control Region #1 (801), Control Region #2 (802)) are set within a UE bandwidth part (810) in the frequency axis and within one slot (820) in the time axis. The control regions (801, 802) may be set to specific frequency resources (803) within the entire UE bandwidth part (810) in the frequency axis. The time axis may be set to one or more OFDM symbols, which may be defined as the control region length (Control Resource Set Duration, 804). Referring to the example illustrated in FIG. 8, Control Region #1 (801) is set to a control region length of two symbols, and Control Region #2 (802) is set to a control region length of one symbol.

[0325] The control region in the aforementioned 5G can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, frequency location of the control region, and symbol length of the control region. For example, this information may include the information in [Table 21] below.

[0326] [Table 21]

[0327]

[0328] In [Table 21], the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control region.

[0329] FIG. 9 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G. According to FIG. 9, the basic unit of time and frequency resources that constitute a control channel can be referred to as a REG (Resource Element Group, 903), and a REG (903) can be defined as 1 OFDM symbol (901) on the time axis and 1 PRB (Physical Resource Block, 902) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (903) to constitute a downlink control channel allocation unit.

[0330] As illustrated in FIG. 9, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 904), 1 CCE (904) can be composed of multiple REGs (903). Taking the REG (903) illustrated in FIG. 9 as an example, the REG (903) can be composed of 12 REs, and if 1 CCE (904) is composed of 6 REGs (903), 1 CCE (904) can be composed of 72 REs. When a downlink control region is established, the region can be composed of multiple CCEs (904), and a specific downlink control channel can be mapped to one or multiple CCEs (904) and transmitted according to the aggregation level (AL) within the control region. CCEs (904) within the control area are distinguished by numbers, and the numbers of the CCEs (904) can be assigned according to a logical mapping method.

[0331] The basic unit of the downlink control channel illustrated in FIG. 9, that is, the REG (903), may include both the REs to which the DCI is mapped and the areas to which the DMRS (905), which is a reference signal for decoding the REs, is mapped. As shown in FIG. 9, three DMRSs (905) may be transmitted within one REG (903). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL = L, one downlink control channel may be transmitted through L CCEs. The terminal must detect a signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates (CCEs) that a terminal must attempt to decode at a given aggregation level. Since there are multiple aggregation levels, each of which can be a set of 1, 2, 4, 8, or 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0332] Search spaces can be categorized into common search spaces and UE-specific search spaces. A certain group of UEs, or all UEs, can search the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling of system information or paging messages. For example, PDSCH scheduling allocation information for transmitting SIBs, including cell operator information, can be received by searching the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's identity and various system parameters.

[0333] In 5G, parameters for the search space for PDCCH can be configured from the base station to the terminal through higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the information in [Table 22] below can be included.

[0334] [Table 22]

[0335]

[0336]

[0337] Depending on the configuration information, the base station may configure one or more search space sets for the terminal. In some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure the terminal to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and may configure the terminal to monitor DCI format B scrambled with Y-RNTI in search space set 2 in a terminal-specific search space.

[0338] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0339] In the common search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these.

[0340] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0341] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0342] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0343] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0344] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0345] In a terminal-specific search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these examples.

[0346] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0347] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0348] The RNTIs specified may follow the definitions and uses below.

[0349] C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0350] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0351] CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0352] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0353] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0354] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0355] INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0356] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0357] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0358] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0359] The aforementioned specified DCI formats may follow the definitions in [Table 23] below.

[0360] [Table 23]

[0361]

[0362] In 5G, the search space of aggregation level L in the control region p and search space set s can be expressed as in [Mathematical Formula 1] below.

[0363] [Mathematical Formula 1]

[0364]

[0365] - : Integration level

[0366] - : Carrier Index

[0367] - : Total number of CCEs existing within the control region p

[0368] - : slot index

[0369] - : Number of PDCCH candidates for aggregation level L

[0370] - : PDCCH candidate index of aggregation level L

[0371] -

[0372] - , , , , ,

[0373] - : Terminal identifier

[0374] The value can be 0 for a common search space.

[0375] In the case of a terminal-specific search space, the value may correspond to a value that changes depending on the terminal's identity (C-RNTI or ID set to the terminal by the base station) and the time index.

[0376] In 5G, since multiple search space sets can be configured with different parameters (e.g., parameters in [Table 22]), the set of search space sets monitored by a terminal at each point in time can be different. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific slot, or can monitor either search space set #1 or search space set #2 in a specific slot.

[0377] [PDSCH / PUSCH: Frequency Resource Allocation Related]

[0378] Next, we describe the frequency domain resource assignment (FDRA) for the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) in NR.

[0379] FIG. 10 is a diagram illustrating an example of frequency axis resource allocation of PDSCH or PUSCH in a wireless communication system according to one embodiment of the present disclosure.

[0380] FIG. 10 is a diagram illustrating three frequency axis resource allocation methods, FDRA type 0 (1000), FDRA type 1 (1005), and dynamic switch (1010), which can be set through an upper layer in an NR wireless communication system.

[0381] Referring to FIG. 10, if the terminal is configured to use only FDRA type 0 through upper layer signaling (1000), some downlink control information (DCI) for scheduling PDSCH or PUSCH to the terminal is N RBG It contains a bitmap consisting of N bits. The conditions for this will be explained later. At this time, N RBG refers to the number of RBGs (resource block groups) determined according to the size of the bandwidth portion allocated by the bandwidth portion indicator and the upper layer parameter rbg-Size as shown in [Table 24] below, and data is transmitted to the RBG indicated as 1 by the bitmap.

[0382] [Table 24]

[0383]

[0384] The size of the frequency resource in the bandwidth part can be defined as the number of RBs included in the bandwidth part. More specifically, if the terminal is instructed to allocate FDRA type-0 resources, the length of the FDRA field of the DCI received by the terminal is the number of RBGs (N) in the bandwidth part. RBG ) and Here, the first RBG within the bandwidth section is It contains RBs of the dog, and the last RBG within the bandwidth part is On the other hand, Contains the RBs of the dog, otherwise, It contains P RBs. The remaining RBGs within the bandwidth portion contain P RBs, where P is the number of nominal RBGs determined according to [Table 24] above.

[0385] If the terminal is configured to use only FDRA type 1 through upper layer signaling (1005), the DCI that allocates PDSCH or PUSCH to the terminal is It contains frequency domain resource allocation information (FDRA) consisting of bits. Here, is the number of RBs included in the bandwidth portion. Through this, the base station can set the starting VRB (1020) and the length of frequency axis resources (1025) allocated continuously therefrom.

[0386] If a terminal is configured to use both FDRA type-0 resource allocation and FDRA type-1 resource allocation through upper layer signaling (1010), some DCIs that allocate PDSCH / PUSCH to the terminal include frequency-axis resource allocation information composed of bits of the larger value (1035) among the payload (1015) for configuring FDRA type-0 resource allocation and the payload (1020, 1025) for configuring FDRA type-1 resource allocation. The conditions for this will be explained later. At this time, one bit may be added to the first part (MSB) of the frequency-axis resource allocation information in the DCI, and if the bit has a value of '0', it may indicate that FDRA type-0 resource allocation is used, and if the bit has a value of '1', it may indicate that FDRA type-1 resource allocation is used.

[0387] If the terminal has been set to use the FDRA type-2 resource allocation method through upper layer signaling, the terminal can be instructed by the base station about the FDRA type-2 resource allocation method according to the following method.

[0388] The terminal can receive RB allocation information from the base station, which is a set of M interlace indices.

[0389] Interlace Index Silver common RB , can be composed of , and M can be defined as in [Table 25].

[0390] [Table 25]

[0391]

[0392] RB in interlace m and bandwidth part i and common RB The relationship with can be defined as follows:

[0393]

[0394] When the subcarrier spacing is 15 kHz (u=0), RB allocation information for an interlace set with m0 + l indices can be notified from the base station to the terminal. In addition, the resource allocation field can be configured with a Resource Indication Value (RIV). The Resource Indication Value When the starting interlace m0 and the number of consecutive interlaces It can be composed of , and its values ​​are as follows:

[0395]

[0396] The resource indicator value is When this happens, the resource indicator value is composed of the start interlace index m0 and l values ​​and can be configured as in [Table 26].

[0397] [Table 26]

[0398]

[0399] When the subcarrier spacing is 30 kHz (u=1), RB allocation information can be notified from the base station to the terminal in the form of a bitmap indicating the interlaces allocated to the terminal. The size of the bitmap is M, and each bit in the bitmap corresponds to an interlace. The order of the interlace bitmap can be mapped from the MSB to the LSB, from interlace index 0 to M-1.

[0400] Also, the least significant bit (LSB) of the FDRA field for 15 kHz and 30 kHz may mean a set of consecutive RBs of PUSCH scheduled with DCI format 0_1. The Y bit may be configured as a resource indication value (RIVRBset). In RIVRBset the value is the starting RB set and the number of consecutive RB sets can be determined as follows. The RIVRBset value can be defined as follows.

[0401]

[0402] It refers to the number of RB sets included in the bandwidth portion, and can be determined by the number of guard gaps (or bands) within the carrier set by upper signaling (or preset).

[0403] [PDSCH / PUSCH: Time Resource Allocation Related]

[0404] Below, a time domain resource allocation method for data channels in next-generation mobile communication systems (5G or NR systems) is described.

[0405] A base station can set up a table for time domain resource allocation information for a downlink data channel (PDSCH) and an uplink data channel (PUSCH) to a terminal via higher layer signaling (e.g., RRC signaling). A table with up to maxNrofDL-Allocations=16 entries can be set up for the PDSCH, and a table with up to maxNrofUL-Allocations=16 entries can be set up for the PUSCH. In one embodiment, the time domain resource allocation information may include PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time point of receiving a PDCCH and the time point of transmitting a PDSCH scheduled by the received PDCCH, denoted as K0), PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time point of receiving a PDCCH and the time point of transmitting a PUSCH scheduled by the received PDCCH, denoted as K2), information on the position and length of a start symbol for which a PDSCH or PUSCH is scheduled within a slot, a mapping type of the PDSCH or PUSCH, etc. For example, information such as [Table 27] or [Table 28] below may be transmitted from a base station to a terminal.

[0406] [Table 27]

[0407]

[0408] [Table 28]

[0409]

[0410] The base station can notify the terminal of one of the entries in the table for the time domain resource allocation information described above via L1 signaling (e.g., DCI) (e.g., indicated by the 'Time Domain Resource Allocation' field in the DCI). The terminal can obtain the time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

[0411] FIG. 11 is a diagram illustrating an example of time axis resource allocation of PDSCH in a wireless communication system according to one embodiment of the present disclosure.

[0412] Referring to Figure 11, the base station uses the upper layer to set the subcarrier spacing (SCS) (μ) of the data channel and the control channel. PDSCH , μ PDCCH ), scheduling offset (K0) value, and the time axis position of the PDSCH resource can be indicated according to the OFDM symbol start position (1100) and length (1105) within a slot dynamically indicated through DCI.

[0413] [PUSCH: Transmission Method Related]

[0414] Next, we describe the scheduling method for PUSCH transmission. PUSCH transmission can be dynamically scheduled by the UL grant within the DCI or can operate by configured grant Type 1 or Type 2. Dynamic scheduling instructions for PUSCH transmission are possible in DCI format 0_0 or 0_1.

[0415] Configured grant Type 1 PUSCH transmission can be semi-statically configured by receiving configuredGrantConfig including rrc-ConfiguredUplinkGrant of [Table 29] through higher-order signaling, without receiving UL grant in DCI. Configured grant Type 2 PUSCH transmission can be semi-persistently scheduled by UL grant in DCI after receiving configuredGrantConfig not including rrc-ConfiguredUplinkGrant of [Table 29] through higher-order signaling. When PUSCH transmission operates by configured grant, parameters applied to PUSCH transmission are applied through configuredGrantConfig of higher-order signaling of [Table 29], except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by pusch-Config of [Table 30]. If the terminal has been provided with transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 29], the terminal applies tp-pi2BPSK in pusch-Config of [Table 30] to PUSCH transmission operated by the configured grant.

[0416] [Table 29]

[0417]

[0418]

[0419] Next, the PUSCH transmission method is described. The DMRS antenna port for PUSCH transmission is the same as the antenna port for SRS transmission. PUSCH transmission can follow a codebook-based or non-codebook-based transmission method, respectively, depending on whether the value of txConfig in the upper signaling, pusch-Config in [Table 30], is 'codebook' or 'nonCodebook'.

[0420] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured by configured grant. If the UE is instructed to schedule PUSCH transmission via DCI format 0_0, the UE performs beam configuration for PUSCH transmission using pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the activated uplink BWP within the serving cell, and the PUSCH transmission is based on a single antenna port. The UE does not expect scheduling for PUSCH transmission via DCI format 0_0 within a BWP where a PUCCH resource including pucch-spatialRelationInfo is not configured. If the UE does not configure txConfig in pusch-Config of [Table 30], the UE does not expect to be scheduled with DCI format 0_1.

[0421] [Table 30]

[0422]

[0423] Next, we describe codebook-based PUSCH transmission. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, or can operate semi-statically based on a configured grant. When codebook-based PUSCH is dynamically scheduled via DCI format 0_1 ​​or semi-statically configured via a configured grant, the UE determines a precoder for PUSCH transmission based on the SRS Resource Indicator (SRI), Transmission Precoding Matrix Indicator (TPMI), and transmission rank (the number of PUSCH transmission layers).

[0424] At this time, the SRI can be given through the SRS resource indicator field in the DCI or configured through the srs-ResourceIndicator higher-level signaling. The UE is configured with at least one SRS resource when transmitting a codebook-based PUSCH, and can be configured with up to two. When the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. In addition, the TPMI and transmission rank can be given through the precoding information and number of layers fields in the DCI or configured through the precodingAndNumberOfLayers higher-level signaling. The TPMI is used to indicate the precoder applied to the PUSCH transmission. If the UE is configured with one SRS resource, the TPMI is used to indicate the precoder to be applied to the configured one SRS resource. When a terminal is configured with multiple SRS resources, TPMI is used to indicate the precoder to be applied in the SRS resource indicated through SRI.

[0425] The precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper layer signaling, SRS-Config. In codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and codebookSubset in the upper layer signaling, pusch-Config. The codebookSubset in the upper layer signaling, pusch-Config, can be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the UE to the base station. If the UE reported 'partialAndNonCoherent' as the UE capability, the UE does not expect the value of codebookSubset in the upper layer signaling to be set to 'fullyAndPartialAndNonCoherent'. Additionally, if the UE reports 'nonCoherent' as the UE capability, the UE does not expect the value of the upper signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports in the upper signaling SRS-ResourceSet points to two SRS antenna ports, the UE does not expect the value of the upper signaling codebookSubset to be set to 'partialAndNonCoherent'.

[0426] The terminal can be configured with one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource in the SRS resource set can be indicated via SRI. If multiple SRS resources are configured in the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal expects that the value of nrofSRS-Ports in the upper signaling SRS-Resource is set to the same value for all SRS resources.

[0427] The terminal transmits to the base station one or more SRS resources included in the SRS resource set in which the usage value is set to 'codebook' according to upper signaling, and the base station selects one of the SRS resources transmitted by the terminal and instructs the terminal to perform PUSCH transmission using transmission beam information of the corresponding SRS resource. At this time, in codebook-based PUSCH transmission, the SRI is used as information for selecting an index of one SRS resource and is included in the DCI. Additionally, the base station includes in the DCI information indicating the TPMI and rank to be used by the terminal for PUSCH transmission. The terminal performs PUSCH transmission by applying the indicated rank and the precoder indicated by the TPMI based on the transmission beam of the corresponding SRS resource using the SRS resource indicated by the SRI.

[0428] Next, we describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can operate semi-statically based on a configured grant. If at least one SRS resource is configured within an SRS resource set in which the usage value in the upper signaling, SRS-ResourceSet, is set to 'nonCodebook', the UE can be scheduled for non-codebook-based PUSCH transmission via DCI format 0_1.

[0429] For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be configured with one connected NZP CSI-RS resource (non-zero power CSI-RS). The UE can perform calculations for a precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the aperiodic SRS transmission at the UE is less than 42 symbols, the UE does not expect information about the precoder for SRS transmission to be updated.

[0430] If the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the connected NZP CSI-RS is indicated by the SRS request field in DCI format 0_1 ​​or 1_1. At this time, if the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the connected NZP CSI-RS is indicated when the value of the SRS request field in DCI format 0_1 ​​or 1_1 is not '00'. At this time, the DCI must not indicate cross-carrier or cross BWP scheduling. In addition, if the value of the SRS request indicates the presence of an NZP CSI-RS, the NZP CSI-RS is located in the slot in which the PDCCH including the SRS request field is transmitted. At this time, the TCI states set for the scheduled subcarriers are not set to QCL-TypeD.

[0431] If a periodic or semi-persistent SRS resource set is configured, the associated NZP CSI-RS can be indicated through the associatedCSI-RS within the upper-level signaling SRS-ResourceSet. For non-codebook-based transmission, the UE does not expect the upper-level signaling spatialRelationInfo for the SRS resource and the associatedCSI-RS within the upper-level signaling SRS-ResourceSet to be configured together.

[0432] When multiple SRS resources are configured, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. At this time, the SRI can be indicated through the SRS resource indicator field in the DCI or set through the srs-ResourceIndicator, which is a higher-order signaling. Similar to the codebook-based PUSCH transmission described above, when the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the UE to the base station. At this time, the SRS resources that the UE simultaneously transmits occupy the same RB. The UE configures one SRS port for each SRS resource. Only one SRS resource set with the usage value set to 'nonCodebook' in the upper signaling SRS-ResourceSet can be set, and up to four SRS resources for non-codebook based PUSCH transmission can be set.

[0433] The base station transmits one NZP-CSI-RS associated with an SRS resource set to the terminal, and the terminal calculates a precoder to be used when transmitting one or more SRS resources within the SRS resource set based on the result measured upon reception of the NZP-CSI-RS. When the terminal transmits one or more SRS resources within the SRS resource set with usage set to 'nonCodebook' to the base station, the terminal applies the calculated precoder, and the base station selects one or more SRS resources from the received one or more SRS resources. At this time, in non-codebook based PUSCH transmission, the SRI represents an index that can express a combination of one or more SRS resources, and the SRI is included in the DCI. At this time, the number of SRS resources indicated by the SRI transmitted by the base station can be the number of transmission layers of the PUSCH, and the terminal transmits the PUSCH by applying the precoder applied to SRS resource transmission to each layer.

[0434] [PUSCH: Preparation time]

[0435] Next, the PUSCH preparation procedure time is described. When the base station schedules a UE to transmit a PUSCH using DCI format 0_0, 0_1, or 0_2, the UE may require a PUSCH preparation procedure time to transmit the PUSCH by applying the transmission method indicated through the DCI (transmission precoding method of SRS resources, number of transmission layers, spatial domain transmission filter). NR takes this into account and defines the PUSCH preparation procedure time. The PUSCH preparation procedure time of the UE can follow the following [Mathematical Formula 2].

[0436] [Equation 2]

[0437]

[0438] T as described in [Mathematical Formula 2] proc,2 In , each variable can have the following meanings:

[0439] - N2: The number of symbols determined by the UE processing capability (UE processing capability) 1 or 2 and the numerology μ according to the UE's capability. If UE processing capability 1 is reported according to the UE's capability report, it has the value of [Table 31]. If UE processing capability 2 is reported and the availability of UE processing capability 2 is set through upper layer signaling, it can have the value of [Table 32].

[0440] [Table 31]

[0441]

[0442] [Table 32]

[0443]

[0444] - d 2,1: The number of symbols set to 0 if all resource elements of the first OFDM symbol of PUSCH transmission are configured to consist of only DM-RS, and 1 otherwise.

[0445] - : 64

[0446] - μ: μ DL or μ UL middle, This follows the larger value μ DL refers to the numerology of the downlink in which the PDCCH containing the DCI scheduling the PUSCH is transmitted, and μ UL It refers to the numerology of the uplink in which PUSCH is transmitted.

[0447] - T c : has

[0448] - d 2,2 : If the DCI scheduling the PUSCH indicates BWP switching, it follows the BWP switching time, otherwise it has 0.

[0449] - d2: When the OFDM symbols of a PUCCH with a high priority index and a PUCCH with a low priority index overlap in time, the d2 value of the PUSCH with the high priority index is used. Otherwise, d2 is 0.

[0450] - T ext : If the terminal uses a shared spectrum channel access method, the terminal is T ext can be calculated and applied to the PUSCH preparation process time. Otherwise, T ext is assumed to be 0.

[0451] - T switch : T when the uplink switching interval is triggered switch is assumed to be the switching interval time. Otherwise, it is assumed to be 0.

[0452] When the base station and the terminal consider the time axis resource mapping information of the PUSCH scheduled through DCI and the influence of the timing advance between uplink and downlink, from the last symbol of the PDCCH including the DCI that scheduled the PUSCH If the first symbol of the PUSCH begins before the first uplink symbol of the CP, the PUSCH preparation time is determined to be insufficient. Otherwise, the base station and the UE determine that the PUSCH preparation time is sufficient. The UE transmits the PUSCH only when the PUSCH preparation time is sufficient, and may ignore the DCI scheduling the PUSCH if the PUSCH preparation time is insufficient.

[0453] [PUSCH: Repetitive Transmission Related]

[0454] The following describes in detail the repetitive transmission of uplink data channels in 5G systems. 5G systems support two types of repetitive transmission methods for uplink data channels: PUSCH repetitive transmission type A and PUSCH repetitive transmission type B. A terminal can be configured with either PUSCH repetitive transmission type A or B via upper layer signaling.

[0455] 1. PUSCH Repetitive Transmission Type A

[0456] - As described above, the symbol length and the position of the start symbol of the uplink data channel are determined by the time domain resource allocation method within one slot, and the base station can notify the terminal of the number of repeated transmissions through upper layer signaling (e.g. RRC signaling) or L1 signaling (e.g. DCI).

[0457] - The terminal can repeatedly transmit an uplink data channel having the same length and start symbol as the configured uplink data channel based on the number of repeated transmissions received from the base station in consecutive slots. At this time, if at least one symbol among the slots configured by the base station as downlink to the terminal or the symbols of the uplink data channel configured to the terminal is configured as downlink, the terminal skips the uplink data channel transmission, but counts the number of repeated transmissions of the uplink data channel. In other words, although it is included in the number of repeated transmissions of the uplink data channel, the uplink data channel may not be transmitted. On the other hand, a terminal that supports Rel-17 repeated uplink data transmission determines a slot in which repeated uplink data transmission is possible as an available slot, and can count the number of transmissions when repeatedly transmitting uplink data channels in slots determined as available slots. If repeated uplink data channel transmission is omitted in a slot determined as an available slot, the terminal does not count the omitted repeated transmission and can postpone it until the next available slot before transmitting.

[0458] - In order to determine the available slot, if at least one symbol set to TDRA (time domain resource allocation) for PUSCH in a slot for PUSCH transmission overlaps with a symbol for a purpose other than uplink transmission (e.g., downlink), the slot is determined as an unavailable slot (e.g., a slot that is not an available slot and is determined to be unavailable for PUSCH transmission). In addition, the available slot may be considered as an uplink resource for determining resources for PUSCH transmission and transport block size (TBS) in repeated PUSCH transmission and multi-slot PUSCH transmission consisting of one TB (TBoMS (transport block on multiple slots)).

[0459] 2. PUSCH Repetitive Transmission Type B

[0460] - As described above, the start symbol and length of the uplink data channel are determined by a time domain resource allocation method within one slot, and the base station can notify the terminal of the number of repetitions through upper signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0461] - First, the nominal repetition of the uplink data channel is determined based on the start symbol and length of the established uplink data channel as follows. The slot where the nth nominal repetition starts is The symbol given by and starting from that slot is is given by . The slot where the nth nominal repetition ends is The symbol given by and ending in that slot is is given by . Here, n=0,..., numberofrepetitions-1, S represents the start symbol of the established uplink data channel, and L represents the symbol length of the established uplink data channel. indicates the slot in which the PUSCH transmission starts. Indicates the number of symbols per slot.

[0462] - The terminal may determine a specific OFDM symbol as an invalid symbol for the following cases for PUSCH repetitive transmission type B.

[0463] o Symbols set to downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated may be determined as invalid symbols for PUSCH repetition transmission type B.

[0464] o In unpaired spectrum (TDD spectrum), symbols indicated by ssb-PositionsInBurst in SIB1 or ssb-PositionsInBurst in ServingCellConfigCommon, which is a higher layer signaling, for SSB reception may be determined as invalid symbols for PUSCH repetition transmission type B.

[0465] o In unpaired spectrum (TDD spectrum), symbols indicated through pdcch-ConfigSIB1 in the MIB to transmit a control resource set associated with a Type0-PDCCH CSS set may be determined as invalid symbols for PUSCH repetition transmission Type B.

[0466] o In Unpaired spectrum (TDD spectrum), if the upper layer signaling numberOfInvalidSymbolsForDL-UL-Switching is set, symbols set to downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated for numberOfInvalidSymbolsForDL-UL-Switching can be determined as invalid symbols.

[0467] - Additionally, an invalid symbol can be set in a higher layer parameter (e.g., InvalidSymbolPattern). The higher layer parameter (e.g., InvalidSymbolPattern) provides a symbol-level bitmap spanning one or two slots, where an invalid symbol can be set. A 1 in the bitmap indicates an invalid symbol. Additionally, the period and pattern of the bitmap can be set via a higher layer parameter (e.g., periodicityAndPattern). If the higher layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the terminal applies the invalid symbol pattern, and if the parameter indicates 0, the terminal does not apply the invalid symbol pattern. If a higher layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not set, the terminal applies an invalid symbol pattern.

[0468] After invalid symbols are determined, for each nominal repetition, the UE may consider symbols other than the invalid symbol as valid symbols. If each nominal repetition contains at least one valid symbol, the nominal repetition may contain one or more actual repetitions. Here, each actual repetition contains a contiguous set of valid symbols that can be used for PUSCH repetitive transmission type B within a single slot. If the OFDM symbol length of the nominal repetition is not 1, the UE may ignore the transmission for the actual repetition if the actual repetition length is 1.

[0469] FIG. 12 is a diagram illustrating a method for determining an available slot when a terminal transmits PUSCH repetition type A in a 5G system according to an embodiment of the present disclosure.

[0470] When the base station configures uplink resources through upper layer signaling (e.g., tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated) or L1 signaling (e.g., dynamic slot format indicator), the base station and terminal can determine available slots for the configured uplink resources according to the following two methods.

[0471] - Method for determining available slots based on TDD configuration

[0472] - Method for determining available slots considering TDD configuration and time domain resource allocation (TDRA), CG (Configured grant) configuration, or activation DCI

[0473] As an example of a method for determining available slots based on a TDD configuration, in FIG. 12, when the TDD configuration is set to 'DDFUU' through upper layer signaling, the base station and the terminal can determine slot #3 and slot #4 set to uplink 'U' based on the TDD configuration as available slots (1201). At this time, slot #2 (1202) set to flexible slot 'F' based on the TDD configuration can be determined as an unavailable slot or an available slot, and can be predefined, for example, through base station settings.

[0474] As an example of a method for determining available slots considering TDD configuration and time domain resource allocation (TDRA), CG configuration or activation DCI, if the TDD configuration is set to 'UUUUU' through upper layer signaling in FIG. 12 and the SLIV (start and length indicator value) of PUSCH transmission is set to {S: 2, L: 12 symbols} through L1 signaling, the base station and the terminal can determine slot #0, slot #1, slot #3, and slot #4 that satisfy SLIV of PUSCH for the set uplink slot 'U' as available slots. At this time, the base station and the terminal can determine slot #2 ('L=9' ≤ SLIV 'L=12') that does not satisfy SLIV, which is a TDRA condition for PUSCH transmission, as an unavailable slot (1203). This is for illustrative purposes only and does not limit the scope to PUSCH transmissions, but can also be applied to PUCCH transmissions, PUSCH / PUCCH repeated transmissions, nominal repetition of PUSCH repetition type B, and TBoMS.

[0475] FIG. 13 is a diagram illustrating an example of PUSCH repetition transmission type B in a wireless communication system according to one embodiment of the present disclosure.

[0476] The following is an example in which the terminal receives the transmission start symbol S as 0, the transmission symbol length L as 10, and the number of repeated transmissions as 10 for the nominal repetition, and can be expressed as N1 to N10 in the drawing (1302). At this time, the terminal can determine the actual repetition by judging the invalid symbol by considering the slot format (1301), and can be expressed as A1 to A10 in the drawing (1303). At this time, according to the invalid symbol and actual repetition determination method described above, the PUSCH repetition type B is not transmitted in the symbol for which the slot format is determined as downlink (DL), and if a slot boundary exists within the nominal repetition, it can be divided into two actual repetitions based on the slot boundary and transmitted. For example, A1, which means the first actual repetition, can be composed of three OFDM symbols, and A2, which can be transmitted next, can be composed of six OFDM symbols.

[0477] Additionally, for PUSCH repetitive transmissions, NR Release 16 can define the following additional methods for UL grant-based PUSCH transmissions across slot boundaries and configured grant-based PUSCH transmissions:

[0478] - Method 1 (mini-slot level repetition): Two or more PUSCH repetitive transmissions are scheduled within a slot or across the boundaries of consecutive slots through a single UL grant. In addition, for Method 1, the time-domain resource allocation information in the DCI indicates the resources of the first repetitive transmission. In addition, the time-domain resource information of the first repetitive transmission and the time-domain resource information of the remaining repetitive transmissions can be determined based on the uplink or downlink direction determined for each symbol in each slot. Each repetitive transmission occupies consecutive symbols.

[0479] - Method 2 (multi-segment transmission): Two or more repeated PUSCH transmissions are scheduled in consecutive slots through a single UL grant. At this time, one transmission is designated for each slot, and each transmission may have a different starting point or repetition length. In addition, in Method 2, the time-domain resource allocation information in the DCI indicates the starting point and repetition length of all repeated transmissions. In addition, when performing repeated transmissions in a single slot through Method 2, if there are multiple sets of consecutive uplink symbols in the slot, each repeated transmission is performed for each set of uplink symbols. If there is only one set of consecutive uplink symbols in the slot, one repeated PUSCH transmission is performed according to the method of NR Release 15.

[0480] - Method 3: Two or more repeated PUSCH transmissions are scheduled in consecutive slots via two or more UL grants. In this case, one transmission is designated for each slot, and the nth UL grant can be received before the PUSCH transmission scheduled for the n-1th UL grant ends.

[0481] - Method 4: One or more PUSCH repetitive transmissions within a single slot, or two or more PUSCH repetitive transmissions across the boundaries of consecutive slots, can be supported through one UL grant or one configured grant. The number of repetitions indicated by the base station to the terminal is only a nominal value, and the number of PUSCH repetitive transmissions actually performed by the terminal may be greater than the nominal number of repetitions. The time-domain resource allocation information in the DCI or the configured grant indicates the resources of the first repetitive transmission indicated by the base station. The time-domain resource information of the remaining repetitive transmissions can be determined with reference to at least the resource information of the first repetitive transmission and the uplink or downlink direction of the symbols. If the time-domain resource information of the repetitive transmission indicated by the base station crosses a slot boundary or includes an uplink / downlink switchover point, the repetitive transmission can be divided into multiple repetitive transmissions. In this case, one repetitive transmission can be included for each uplink period within one slot.

[0482] [PUSCH: Frequency Hopping Process]

[0483] Below, we specifically describe frequency hopping of the uplink data channel (PUSCH) in a 5G system.

[0484] In 5G, two methods are supported for frequency hopping of uplink data channels for each PUSCH repetition transmission type. First, PUSCH repetition transmission type A supports intra-slot frequency hopping and inter-slot frequency hopping, and PUSCH repetition transmission type B supports inter-repetition frequency hopping and inter-slot frequency hopping.

[0485] The intra-slot frequency hopping method supported by PUSCH repetitive transmission type A is a method in which a terminal transmits by changing the allocated frequency domain resources by a set frequency offset in two hops within a single slot. In intra-slot frequency hopping, the starting RB of each hop can be expressed using [Mathematical Formula 3].

[0486] [Equation 3]

[0487]

[0488] In [Mathematical Formula 3], i=0 and i=1 represent the first hop and the second hop, respectively. Indicates the starting RB within the UL BWP and is calculated from the frequency resource allocation method. The upper layer parameter indicates the frequency offset between two hops. The number of symbols in the first hop is can be represented as , and the number of symbols in the second hop is can be expressed as is the length of PUSCH transmission within one slot, expressed as the number of OFDM symbols.

[0489] Next, the inter-slot frequency hopping method supported by PUSCH repetitive transmission types A and B is a method in which the terminal changes the allocated resources of the frequency domain by a set frequency offset for each slot and transmits them. In inter-slot frequency hopping, The starting RB during the slot can be expressed by [Mathematical Formula 4].

[0490] [Equation 4]

[0491]

[0492] In [Equation 4], is the current slot number in multi-slot PUSCH transmission, Indicates the starting RB within the UL BWP and is calculated from the frequency resource allocation method. Indicates the frequency offset between two hops through upper layer parameters.

[0493] Next, the inter-repetition frequency hopping method supported by PUSCH repetitive transmission type B is to transmit the allocated resources in the frequency domain for one or more actual repetitions within each nominal repetition by shifting them by a set frequency offset. RB is the index of the starting RB in the frequency domain for one or more actual repetitions within the nth nominal repetition. start (n) can follow the following [Mathematical Formula 5].

[0494] [Equation 5]

[0495]

[0496] In [Mathematical Equation 5], n is the index of nominal repetition, Indicates the RB offset between two hops via upper layer parameters.

[0497] [PUSCH: Transmission Power Related]

[0498] Below, a method for determining the transmission power of an uplink data channel in a 5G system is specifically described.

[0499] In a 5G system, the transmission power of an uplink data channel can be determined using the following [Mathematical Formula 6].

[0500] [Equation 6]

[0501]

[0502] In [Mathematical Formula 6], j represents the grant type of PUSCH, and specifically, j=0 is a PUSCH grant for random access response, j=1 is a configured grant, means dynamic grant. means the maximum output power set to the terminal for carrier f of supporting cell c for PUSCH transmission occasion i. is set as a higher layer parameter and can be determined through upper layer settings and SRI (in case of dynamic grant PUSCH). It is a parameter composed of the sum of . means the bandwidth for resource allocation expressed as the number of resource blocks for PUSCH PUSCH transmission occasion i, It means a value determined according to the MCS (Modulation Coding Scheme) and the type of information transmitted via PUSCH (e.g., whether UL-SCH is included or CSI is included, etc.). refers to a value that can be determined (in case of dynamic grant PUSCH) through upper layer settings and SRI (SRS Resource Indicator) as a value to compensate for path loss. is the reference signal index q d It means the downlink path loss estimate estimated by the terminal through the reference signal, and the reference signal index q. d The UE can decide this via upper layer configuration and SRI (in case of dynamic grant PUSCH or configured grant PUSCH based on ConfiguredGrantConfig that does not include upper layer configuration rrc-ConfiguredUplinkGrant (type 2 configured grant PUSCH)) or via upper layer configuration. can be supported in both accumulation and absolute modes as closed loop power adjustment values. If the upper layer parameter tpc-Accumulation is not set in the terminal, the closed loop power adjustment value can be determined in accumulation mode. In this case, is the closed loop power adjustment value for the previous PUSCH transmission occasion i-i0 to transmit PUSCH transmission occasion i-i0. PUSCH Transmitting PUSCH transmission occasion i from (i-i0)-1 symbols K PUSCH (i) Between symbols, the sum of the TPC command values ​​for the closed loop index l received through DCI is determined. If the upper layer parameter tpc-Accumulation is set in the terminal, is the TPC command value for the closed loop index l received via DCI. is determined. The closed loop index l can be set to 0 or 1 if the upper layer parameter twoPUSCH-PC-AdjustmentStates is set in the terminal, and its value can be determined through the upper layer configuration and SRI (in case of dynamic grant PUSCH). The TPC command field and TPC value in the DCI according to the accumulation method and the absolute method. The mapping relationship can be defined as shown in [Table 33] below.

[0503] [Table 33]

[0504]

[0505] [Regarding terminal capability reporting]

[0506] In LTE and NR, a terminal, while connected to a serving base station, can perform a procedure to report its supported capabilities to the base station. In the description below, this is referred to as a UE capability report.

[0507] A base station can transmit a UE capability inquiry message requesting a capability report to a connected terminal. The message can include a UE capability request for each RAT (radio access technology) type of the base station. The RAT type-specific request can include information on a combination of supported frequency bands, etc. In addition, in the case of the UE capability inquiry message, UE capabilities for multiple RAT types can be requested through a single RRC message container transmitted by the base station, or the base station can include multiple UE capability inquiry messages including UE capability requests for each RAT type and transmit them to the terminal. That is, the UE capability inquiry can be repeated multiple times in one message, and the terminal can compose a corresponding UE capability information message and report it multiple times. In the next-generation mobile communication system, a UE capability request can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, and EN-DC (E-UTRA - NR dual connectivity). Additionally, the terminal capability inquiry message is typically transmitted initially after the terminal is connected to the base station, but the base station may request it under any conditions when necessary.

[0508] In the above step, the terminal that receives the UE capability report request from the base station configures the terminal capability based on the RAT type and band information requested from the base station. Below is a summary of how the terminal configures the UE capability in the NR system.

[0509] 1. If the UE receives a list of LTE and / or NR bands through a UE capability request from the base station, the UE configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, it configures a candidate list of BCs for EN-DC and NR SA based on the bands requested to the base station via FreqBandList. Furthermore, the bands are prioritized in the order listed in FreqBandList.

[0510] 2. If the base station requests UE capability reporting by setting the "eutra-nr-only" flag or the "eutra" flag, the UE completely removes NR SA BCs from the list of configured BC candidates. This operation can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0511] 3. The terminal then removes fallback BCs from the BC candidate list constructed in the above step. Here, a fallback BC is a BC obtained by removing at least one band corresponding to an SCell from a random BC. This step can be omitted because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step are the final "candidate BC list."

[0512] 4. The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final "candidate BC list" above. In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report according to the preset rat-Type order (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of "candidate feature set combinations" from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The "candidate feature set combinations" above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0513] 5. Also, if the requested rat Type is eutra-nr and has an effect, featureSetCombinations are included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the NR feature set is included only in UE-NR-Capabilities.

[0514] After terminal capabilities are configured, the terminal transmits a terminal capability information message containing the terminal capabilities to the base station. Based on the terminal capabilities received from the terminal, the base station then performs appropriate scheduling and transmission / reception management for the terminal.

[0515] [NC-JT related]

[0516] According to one embodiment of the present disclosure, Non-Coherent Joint Transmission (NC-JT) may be used for a terminal to receive PDSCH from multiple TRPs.

[0517] Unlike existing systems, 5G wireless communication systems can support not only services requiring high transmission speeds, but also services with very short transmission delays and high connection density. In a wireless communication network comprising multiple cells, transmission and reception points (TRPs), or beams, coordinated transmission between each cell, TRP, or / and beam can increase the signal strength received by a terminal or efficiently control interference between each cell, TRP, or / and beam, thereby satisfying diverse service requirements.

[0518] Joint Transmission (JT) is a representative transmission technology for the aforementioned cooperative communication, which increases the signal strength or processing rate received by a terminal by transmitting a signal to a single terminal through a number of different cells, TRPs, or / and beams. At this time, the channel between each cell, TRP, or / and beam and the terminal may have significantly different characteristics, and in particular, in the case of Non-Coherent Joint Transmission (NC-JT) that supports non-coherent precoding between each cell, TRP, or / and beam, individual precoding, MCS, resource allocation, TCI indication, etc. may be required depending on the channel characteristics of each link between each cell, TRP, or / and beam and the terminal.

[0519] The above-described NC-JT transmission can be applied to at least one channel among the downlink data channel (PDSCH), downlink control channel (PDCCH), uplink data channel (PUSCH), and uplink control channel (PUCCH). When transmitting PDSCH, transmission information such as precoding, MCS, resource allocation, and TCI are indicated as DL DCI, and for NC-JT transmission, the transmission information must be independently indicated for each cell, TRP, or / and beam. This is a major factor that increases the payload required for DL ​​DCI transmission, and this may adversely affect the reception performance of the PDCCH transmitting the DCI. Therefore, in order to support JT of PDSCH, it is necessary to carefully design a tradeoff between the amount of DCI information and the reception performance of control information.

[0520] FIG. 14 is a diagram illustrating an example of an antenna port configuration and resource allocation for transmitting a PDSCH using cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0521] Referring to FIG. 14, examples for PDSCH transmission are explained for each technique of joint transmission (JT), and examples for allocating radio resources for each TRP are shown.

[0522] Referring to FIG. 14, an example (1400) for coherent joint transmission (C-JT) supporting coherent precoding between each cell, TRP or / and beam is illustrated.

[0523] In the case of C-JT, TRP A (1405) and TRP B (1410) transmit a single data (PDSCH) to the terminal (1415), and joint precoding can be performed on multiple TRPs. This may mean that DMRS is transmitted through the same DMRS ports for TRP A (1405) and TRP B (1410) to transmit the same PDSCH. For example, TRP A (1405) and TRP B (1410) may each transmit DRMS ​​to the terminal through DMRS port A and DMRS B. In this case, the terminal may receive one DCI information for receiving one PDSCH that is demodulated based on the DMRS transmitted through DMRS port A and DMRS B.

[0524] FIG. 14 illustrates an example (1420) of Non-Coherent Joint Transmission (NC-JT) supporting non-coherent precoding between each cell, TRP, or / and beam for PDSCH transmission.

[0525] In the case of NC-JT, PDSCH is transmitted to the terminal (1435) for each cell, TRP or / and beam, and individual precoding can be applied to each PDSCH. Each cell, TRP or / and beam transmits a different PDSCH or a different PDSCH layer to the terminal, thereby improving the throughput compared to single cell, TRP or / and beam transmission. In addition, each cell, TRP or / and beam repeatedly transmits the same PDSCH to the terminal, thereby improving the reliability compared to single cell, TRP or / and beam transmission. For convenience of explanation, cells, TRPs or / and beams are collectively referred to as TRPs hereinafter.

[0526] At this time, various wireless resource allocations can be considered, such as when the frequency and time resources used by multiple TRPs for PDSCH transmission are all the same (1440), when the frequency and time resources used by multiple TRPs do not overlap at all (1445), and when some of the frequency and time resources used by multiple TRPs overlap (1450).

[0527] To support NC-JT, DCIs of various forms, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to a single terminal.

[0528] FIG. 15 is a diagram illustrating an example of a configuration of downlink control information (DCI) for NC-JT in which each TRP transmits a different PDSCH or a different PDSCH layer to a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0529] Referring to FIG. 15, case #1 (1500) is an example in which, in addition to the serving TRP (TRP#0) used for single PDSCH transmission, (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)), and control information for PDSCHs transmitted from the (N-1) additional TRPs is transmitted independently from the control information for the PDSCHs transmitted from the serving TRP. That is, the terminal can obtain control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through independent DCIs (DCI#0 to DCI#(N-1)). The formats between the independent DCIs may be the same or different, and the payloads between the DCIs may also be the same or different. In the aforementioned case #1, each PDSCH control or allocation freedom can be fully guaranteed, but if each DCI is transmitted in different TRPs, coverage differences may occur for each DCI, which may deteriorate reception performance.

[0530] Case #2 (1505) shows an example in which, in addition to the serving TRP (TRP#0) used for single PDSCH transmission, (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)), control information (DCI) for the PDSCHs of the (N-1) additional TRPs is transmitted respectively, and each of these DCIs is dependent on the control information for the PDSCH transmitted from the serving TRP.

[0531] For example, in the case of DCI#0, which is control information for a PDSCH transmitted from a serving TRP (TRP#0), it includes all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, but in the case of shortened DCI (hereinafter, sDCI) (sDCI#0 to sDCI#(N-2)), which is control information for PDSCHs transmitted from cooperative TRPs (TRP#1 to TRP#(N-1)), it may include only some of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2. Therefore, in the case of sDCI, which transmits control information for PDSCHs transmitted from cooperative TRPs, since the payload is smaller than that of normal DCI (nDCI), which transmits PDSCH-related control information transmitted from a serving TRP, it is possible to include reserved bits compared to nDCI.

[0532] In the aforementioned case #2, the degree of freedom in controlling or allocating each PDSCH may be limited depending on the content of the information elements included in sDCI, but since the reception performance of sDCI is superior to that of nDCI, the probability of a difference in coverage by DCI may be reduced.

[0533] Case #3 (1510) shows an example in which, in a situation in which (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used for single PDSCH transmission, one control information for the PDSCHs of the (N-1) additional TRPs is transmitted, and this DCI is dependent on the control information for the PDSCH transmitted from the serving TRP.

[0534] For example, in the case of DCI#0, which is control information for PDSCH transmitted from a serving TRP (TRP#0), it includes all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, and in the case of control information for PDSCHs transmitted from cooperative TRPs (TRP#1 to TRP#(N-1)), it is possible to collect only some of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 into one 'secondary' DCI (sDCI) and transmit them. For example, the sDCI may include at least one piece of information among HARQ-related information such as frequency domain resource assignment, time domain resource assignment, and MCS of cooperative TRPs. In addition, for information not included in sDCI, such as BWP (bandwidth part) indicator or carrier indicator, the DCI (DCI#0, normal DCI, nDCI) of serving TRP can be followed.

[0535] Case #3 (1510) may have limited freedom in controlling or allocating each PDSCH depending on the content of the information element included in sDCI, but it is possible to control the reception performance of sDCI and the complexity of DCI blind decoding of the terminal may be reduced compared to case #1 (1500) or case #2 (1505).

[0536] Case #4 (1515) is an example of transmitting control information for PDSCHs transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in the same DCI (Long DCI) as the control information for PDSCHs transmitted from the serving TRP in a situation where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs in addition to the serving TRP (TRP#0) used for single PDSCH transmission. That is, the UE can obtain control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI. In case #4 (1515), the complexity of DCI blind decoding of the UE may not increase, but the degree of freedom in PDSCH control or allocation may be low, such as because the number of cooperative TRPs is limited due to the long DCI payload limitation.

[0537] In the following descriptions and examples, sDCI may refer to various auxiliary DCIs, such as shortened DCI, secondary DCI, or normal DCI (DCI format 1_0 to 1_1 described above) containing PDSCH control information transmitted in a cooperative TRP, and unless a special limitation is specified, the description can be similarly applied to the various auxiliary DCIs described above.

[0538] In the following description and examples, the aforementioned cases #1 (1500), #2 (1505), and #3 (1510), in which more than one DCI (PDCCH) is used to support NC-JT, may be classified as multiple PDCCH-based NC-JT, and the aforementioned case #4 (1515), in which a single DCI (PDCCH) is used to support NC-JT, may be classified as single PDCCH-based NC-JT. In PDSCH transmission based on multiple PDCCH, a CORESET in which the DCI of the serving TRP (TRP#0) is scheduled and a CORESET in which the DCI of the cooperating TRPs (TRP#1 to TRP#(N-1)) are scheduled may be distinguished. As a method for distinguishing the CORESETs, there may be a method for distinguishing through an upper layer indicator for each CORESET, a method for distinguishing through beam setting for each CORESET, etc. Additionally, in single PDCCH-based NC-JT, instead of a single DCI scheduling multiple PDSCHs, a single PDSCH with multiple layers is scheduled, and the multiple layers described above can be transmitted from multiple Transmission Relays (TRPs). In this case, the connection relationship between a layer and the TRP transmitting the layer can be indicated through a Transmission Configuration Indicator (TCI) indication for the layer.

[0539] In the embodiments of the present disclosure, “cooperative TRP” may be replaced with various terms such as “cooperative panel” or “cooperative beam” in actual application.

[0540] In the embodiments of the present disclosure, “when NC-JT is applied” can be interpreted in various ways depending on the situation, such as “when a terminal simultaneously receives one or more PDSCHs in one BWP,” “when a terminal simultaneously receives PDSCHs based on two or more TCI (Transmission Configuration Indicator) indications in one BWP,” or “when a PDSCH received by a terminal is associated with one or more DMRS port groups,” but is used as a single expression for convenience of explanation.

[0541] The wireless protocol architecture for NC-JT in the present disclosure can be used in various ways depending on the TRP deployment scenario. For example, when there is no or small backhaul delay between cooperative TRPs, a method using a structure based on MAC layer multiplexing (CA-like method) similar to S10 of FIG. 4 is possible. On the other hand, when the backhaul delay between cooperative TRPs is so large that it cannot be ignored (for example, when it takes more than 2 ms to exchange information such as CSI, scheduling, and HARQ-ACK between cooperative TRPs), a method (DC-like method) is possible to secure delay-robust characteristics by using an independent structure for each TRP starting from the RLC layer, similar to S20 of FIG. 4.

[0542] A terminal supporting C-JT or / and NC-JT can receive C-JT or / and NC-JT related parameters or setting values ​​from a higher layer configuration, and set the RRC parameters of the terminal based on the parameters. For the higher layer configuration, the terminal can utilize a UE capability parameter, for example, tci-StatePDSCH. Here, the UE capability parameter, for example, tci-StatePDSCH, can define TCI states for the purpose of PDSCH transmission, and the number of TCI states can be set to 4, 8, 16, 32, 64, 128 in FR1, and to 64 and 128 in FR2, and among the set number, up to 8 states can be set that can be indicated by 3 bits of the TCI field of the DCI via a MAC CE message. The maximum value 128 means the value indicated by maxNumberConfiguredTCIstatesPerCC in the tci-StatePDSCH parameter included in the capability signaling of the terminal. In this way, a series of configuration processes from upper layer configuration to MAC CE configuration can be applied to a beamforming instruction or beamforming change command for at least one PDSCH in one TRP.

[0543] [SBFD (XDD) related]

[0544] While 5G mobile communication services have introduced additional coverage expansion technologies compared to LTE, actual 5G mobile communication services will generally utilize TDD systems, which are suitable for services with a high proportion of downlink traffic. Furthermore, as the center frequency increases to expand the frequency band, the coverage between base stations and terminals decreases, making coverage enhancement a key requirement for 5G mobile communication services. In particular, because terminal transmission power is generally lower than that of base stations and services with a high proportion of downlink traffic are supported, and because the downlink portion of the time domain is higher than that of uplink, uplink channel coverage enhancement is crucial. Physical methods for improving uplink channel coverage between base stations and terminals include increasing the time resources of the uplink channel, lowering the center frequency, or increasing the transmission power of terminals. However, changing the frequency may be limited because frequency bands are determined by each network operator. Additionally, because the maximum transmission power of a terminal is regulated to reduce interference, there may be restrictions on increasing the maximum transmission power of a terminal to improve coverage.

[0545] Therefore, in order to improve the coverage of base stations and terminals, not only can uplink and downlink resources be divided in the time domain according to the traffic proportions of uplink and downlink as in a TDD system, but uplink and downlink resources can also be divided in the frequency domain as in an FDD system. In one embodiment, a system that can flexibly divide uplink resources and downlink resources in the time domain and the frequency domain may be referred to as an XDD (cross division duplex) system, a Flexible TDD (time division duplex) system, a Hybrid TDD system, a TDD-FDD (frequency division duplex) system, a Hybrid TDD-FDD system, etc., and for convenience of explanation, this will be described as an XDD system in the present disclosure. According to one embodiment, X in XDD may mean time or frequency.

[0546] FIG. 16 is a diagram illustrating an example of an uplink-downlink resource configuration of an XDD system that flexibly divides uplink and downlink resources in the time domain and frequency domain according to one embodiment of the present disclosure.

[0547] Referring to FIG. 16, from the base station perspective, the uplink-downlink configuration (1600) of the overall XDD system can flexibly allocate resources to each symbol or slot (1602) according to the traffic proportions of uplink and downlink for the entire frequency band (1601). However, this is just an example, and the unit to which resources are allocated is not limited to a symbol or slot (1602), and resources can also be flexibly allocated according to units such as mini slots. At this time, a guard band (1604) can be allocated between the frequency bands of the downlink resources (1603) and the uplink resources (1605). This guard band (1604) can be allocated as a measure to reduce interference applied to the uplink channel or signal reception due to out-of-band emission that occurs when the base station transmits a downlink channel or signal in the downlink resources (1603). At this time, for example, terminal 1 (1610) and terminal 2 (1620), which have overall more downlink traffic than uplink traffic due to the base station settings, can be allocated downlink and uplink resource ratios of 4:1 in the time domain. At the same time, terminal 3 (1630), which operates at the cell edge and has insufficient uplink coverage, can be allocated only uplink resources during a specific time interval due to the base station settings. Additionally, terminal 4 (1640), which operates at the cell edge and has insufficient uplink coverage but has relatively large amounts of downlink and uplink traffic, can be allocated more uplink resources in the time domain and more downlink resources in the frequency band for uplink coverage. As in the example described above, terminals with relatively large downlink traffic operating at the cell center can be allocated more downlink resources in the time domain, and terminals with relatively insufficient uplink coverage operating at the cell edge can be allocated more uplink resources in the time domain, which is advantageous.

[0548] FIG. 17 is a diagram illustrating an example of an uplink-downlink resource configuration of a full duplex communication system in which uplink and downlink resources are flexibly divided into time domain and frequency domain according to one embodiment of the present disclosure.

[0549] According to an example illustrated in FIG. 17, all or part of downlink resources (1700) and uplink resources (1701) may be configured to overlap in the time and frequency domains. Downlink transmission from a base station to a terminal may be performed in an area configured as downlink resources (1700), and uplink transmission from a terminal to a base station may be performed in an area configured as uplink resources (1701).

[0550] In an example of FIG. 17, the downlink resources (1710) and uplink resources (1711) may be configured to overlap entirely in the time resources corresponding to the symbol or slot (1702) and the frequency resources corresponding to the bandwidth (1703). In this case, since the downlink resources (1710) and uplink resources (1711) overlap in time and frequency, downlink and uplink transmission and reception of a base station or terminal may occur simultaneously in the same time and frequency resources.

[0551] In another example of FIG. 17, a portion of downlink resources (1720) and uplink resources (1721) may be configured to overlap in time resources corresponding to symbols or slots and frequency resources corresponding to bandwidth (1703). In this case, downlink and uplink transmission and reception of a base station or terminal may occur simultaneously in some areas where downlink resources (1720) and uplink resources (1721) overlap.

[0552] In another example of FIG. 17, downlink resources (1730) and uplink resources (1731) can be set so that they do not overlap in time resources corresponding to symbols or slots and frequency resources corresponding to bandwidth (1703).

[0553] FIG. 18 is a diagram illustrating a transmission and reception structure for a duplex method according to one embodiment of the present disclosure.

[0554] The transmission / reception structure illustrated in FIG. 18 can be used in a base station device or a terminal device. According to the transmission / reception structure illustrated in FIG. 18, the transmitter can be composed of blocks such as a transmission baseband block (Tx Baseband, 1810), a digital pre-distortion block (Digital Pre-Distortion; DPD, 1811), a digital-to-analog converter (DAC, 1812), a pre-driver (Pre-driver, 1813), a power amplifier (PA, 1814), and a transmission antenna (Tx Antenna, 1815). Each block can perform the following roles.

[0555] Transmit Baseband Block (1810): Digital processing block for the transmit signal.

[0556]

[0557] *Digital Pre-Distortion Block (1811): Pre-distortion of digital transmission signals.

[0558] Digital-to-Analog Converter (1812): Converts digital signals to analog signals.

[0559] Pre-driver (1813): progressive power amplification of analog transmission signals.

[0560] Power amplifier (1814): power amplification of analog transmission signals

[0561] Transmitting antenna (1815): An antenna for transmitting signals.

[0562] According to the transmission and reception structure illustrated in FIG. 18, the receiving end may be composed of blocks such as a receiving antenna (Rx Antenna, 1824), a low noise amplifier (LNA, 1823), an analog-to-digital converter (ADC, 1822), a successive interference canceller (Successive Interference Canceller, 1821), and a receiving baseband block (Rx Baseband, 1820). Each block may perform the following roles.

[0563] Receiving antenna (1824): Antenna for receiving signals

[0564] Low-Noise Amplifier (1823): Amplifies the power of an analog received signal while minimizing the amplification of noise.

[0565] Analog-to-digital converter (1822): converts analog signals to digital signals

[0566] Continuous Interference Canceller (1821): Interference canceller for digital signals

[0567] Receive Baseband Block (1820): Digital processing block for the received signal.

[0568] According to the transmission and reception structure illustrated in Fig. 18, a power amplifier coupler (PA Coupler, 1816) and a coefficient update block (Coefficient Update, 1817) may be present for additional signal processing between the transmitter and receiver. Each block may perform the following roles.

[0569] Power amplifier connector (1816): A block for observing the waveform of an analog transmission signal that has passed through a power amplifier at the receiving end.

[0570] Constant Update Block (1817): Updates various constants required for digital domain signal processing at the transmitter and receiver. The constants calculated here can be used to set various parameters in the DPD (1811) block at the transmitter and the SIC (1821) block at the receiver.

[0571] The transmission and reception structure illustrated in FIG. 18 can be utilized for the purpose of effectively controlling interference between a transmission signal and a reception signal when transmission and reception operations are performed simultaneously at a base station or a terminal device. For example, when transmission and reception occur simultaneously at a certain device, a transmission signal (1801) transmitted through a transmission antenna (1815) of a transmission end may be received through a reception antenna (1824) of a reception end, and in this case, the transmission signal (1801) received by the reception end may cause interference (1800) with a reception signal (1802) that the reception end originally intended to receive. The interference between the transmission signal (1801) and the reception signal (1802) received by the reception end is referred to as self-interference (1800).

[0572] For example, to explain specifically, if a base station device performs downlink transmission and uplink reception at the same time, the downlink signal transmitted by the base station may be received by the base station's receiving end, and as a result, interference may occur between the downlink signal transmitted by the base station and the uplink signal that the base station originally intended to receive at the receiving end. If a terminal device performs downlink reception and uplink transmission at the same time, the uplink signal transmitted by the terminal may be received by the receiving end of the terminal, and as a result, interference may occur between the uplink signal transmitted by the terminal and the downlink signal that the terminal originally intended to receive at the receiving end. Interference between links in different directions, that is, downlink signals and uplink signals, at the base station and the terminal device is also referred to as cross-link interference.

[0573] In one embodiment of the present disclosure, self-interference between a transmission signal (or downlink signal) and a reception signal (or uplink signal) may occur in a system in which transmission and reception can be performed simultaneously.

[0574] For example, magnetic interference may occur in the XDD system described above.

[0575] Figure 19 is a diagram illustrating an example of downlink and uplink resource settings in an XDD system.

[0576] In the case of XDD, downlink (1900) resources and uplink (1903) resources can be distinguished in the frequency domain, and a guard band (GB, 1904) can exist between the downlink (1900) resources and the uplink (1901) resources. Actual downlink transmission can be performed within the downlink bandwidth (1902), and uplink transmission can be performed within the actual uplink bandwidth (1903). At this time, leakage (1906) may occur outside the uplink or downlink transmission band. In an area where downlink resources (1900) and uplink resources (1901) are adjacent, interference due to this leakage (which may be named Adjacent Carrier Leakage (ACL, 1905)) may occur.

[0577] FIG. 19 illustrates an example in which an ACL (1905) occurs from a downlink (1900) to an uplink (1901). As the downlink bandwidth (1902) and the uplink bandwidth (1903) become closer together, the influence of signal interference by the ACL (1905) may increase, which may result in performance degradation. For example, as illustrated in FIG. 19, some resource areas (1906) within the uplink band (1903) adjacent to the downlink band (1902) may be significantly affected by interference by the ACL (1905). Some resource areas (1907) within the uplink band (1903) relatively far from the downlink band (1902) may be less affected by interference by the ACL (1905). That is, within the uplink band (1903), there may exist a resource area (1906) that is relatively more affected by interference and a resource area (1907) that is relatively less affected by interference.

[0578] In order to reduce performance degradation caused by the ACL (1905), a guard band (1904) may be inserted between the downlink bandwidth (1902) and the uplink bandwidth (1903). As the size of the guard band (1904) increases, the interference effect caused by the ACL (1905) between the downlink bandwidth (1902) and the uplink bandwidth (1903) may be reduced, which has the advantage of reducing resource efficiency. Conversely, as the size of the guard band (1904) decreases, the amount of resources available for transmission and reception may increase, which has the advantage of increasing resource efficiency. However, there is the disadvantage that the interference effect caused by the ACL (1905) between the downlink bandwidth (1902) and the uplink bandwidth (1903) may be increased. Therefore, it may be important to determine an appropriate size of the guard band (1904) by considering the trade-offs.

[0579] Meanwhile, 3GPP is discussing SBFD (Subband Non-Overlapping Full Duplex) as a new duplex method based on NR. SBFD is a technology that utilizes a portion of downlink resources as uplink resources in the TDD band (spectrum) of frequencies below 6 GHz or above 6 GHz, thereby receiving uplink transmissions from terminals equivalent to the increased uplink resources, thereby expanding the uplink coverage of the terminal, and receiving feedback from the terminal on downlink transmissions using the expanded uplink resources, thereby reducing feedback delay. In the present disclosure, a terminal that receives information on whether SBFD is supported from a base station and can perform uplink transmissions using a portion of downlink resources may be conveniently referred to as an SBFD terminal (SBFD-capable UE). The following methods may be considered for defining the SBFD method in the standard and for an SBFD terminal to determine whether SBFD is supported in a specific cell (or frequency, frequency band).

[0580] First method. In addition to the existing unpaired spectrum (or time division duplex, TDD) or paired spectrum (or frequency division duplex, FDD) frame structure types, another frame structure type (e.g., frame structure type 2) may be introduced to define the above SBFD. The above frame structure type 2 may be defined as being supported in the specific frequency or frequency band, or the base station may indicate to the terminal whether SBFD is supported as system information. The SBFD terminal may receive the system information including whether SBFD is supported and determine whether SBFD is supported in the specific cell (or frequency, frequency band).

[0581] Second method. Whether SBFD is additionally supported in a specific frequency or frequency band of an existing unpaired spectrum (or TDD) can be indicated without defining a new frame structure type. In the second method, whether SBFD is additionally supported in a specific frequency or frequency band of an existing unpaired spectrum can be defined, or the base station can indicate to the terminal whether SBFD is supported as system information. The SBFD terminal can receive system information including whether SBFD is supported and determine whether SBFD is supported in the specific cell (or frequency, frequency band).

[0582] In the first and second methods described above, the information on whether SBFD is supported may be information that indirectly indicates whether SBFD is supported by additionally setting a portion of downlink resources as uplink resources in addition to the TDD UL (uplink)-DL (downlink) resource configuration information indicating downlink slot (or symbol) resources and uplink slot (or symbol) resources of TDD (for example, SBFD resource configuration information in FIG. 20 described below), or may be information that directly indicates whether SBFD is supported.

[0583] In the present disclosure, the SBFD terminal can obtain cell synchronization by receiving a synchronization signal block during the initial cell access for connecting to a cell (or base station). The process for obtaining cell synchronization may be the same for the SBFD terminal and the existing TDD terminal. Thereafter, the SBFD terminal can determine whether the cell supports SBFD through a MIB acquisition process, a SIB acquisition process, or a random access process.

[0584] The system information for transmitting information on whether the above SBFD is supported may be system information transmitted separately from the system information for terminals supporting other versions of the standard within the cell (e.g., existing TDD terminals), and the SBFD terminal may determine whether SBFD is supported by obtaining all or part of the system information for the existing TDD terminal and the separately transmitted system information. If the SBFD terminal obtains only the system information for the existing TDD terminal or obtains system information on non-support of SBFD, the cell (or base station) may determine that it supports only TDD.

[0585] If the information on whether the above SBFD is supported is included in the system information for a terminal that supports a different version of the standard (e.g., an existing TDD terminal), the information on whether the above SBFD is supported may be inserted at the very end so as not to affect the acquisition of system information by the existing TDD terminal. If the SBFD terminal does not obtain the information on whether the above SBFD is supported inserted at the very end, or obtains information that SBFD is not supported, the SBFD terminal can determine that the cell (or base station) only supports TDD.

[0586] If the information on whether the SBFD is supported is included in the system information for a terminal supporting a different version of the standard (e.g., an existing TDD terminal), the information on whether the SBFD is supported may be transmitted through a separate PDSCH so as not to affect the acquisition of system information by the existing TDD terminal. That is, a terminal that does not support SBFD can receive a first SIB (or SIB1) including existing TDD-related system information from a first PDSCH. An SBFD-supporting terminal can receive a first SIB (or SIB) including existing TDD-related system information from a first PDSCH, and a second SIB including SBFD-related system information from a second PDSCH. Here, the first PDSCH and the second PDSCH can be scheduled as the first PDCCH and the second PDCCH, and the CRC (cyclic redundancy code) of the first PDCCH and the second PDCCH can be scrambled with the same RNTI (e.g., SI-RNTI). The search space for monitoring the second PDCCH can be obtained from the system information of the first PDSCH, and if it is not obtained (i.e., the system information of the first PDSCH does not include information about the search space), the second PDCCH can be received in the same search space as the search space of the first PDCCH.

[0587] As described above, when the SBFD terminal determines that the cell (or base station) supports only TDD, the SBFD terminal can perform random access procedures and transmit and receive data / control signals in the same manner as a conventional TDD terminal.

[0588] The base station may configure separate random access resources for each of an existing TDD terminal or an SBFD terminal (e.g., an SBFD terminal supporting duplex communication and an SBFD terminal supporting half-duplex communication), and transmit configuration information (control information or configuration information indicating time-frequency resources that can be used for PRACH) for the random access resources to the SBFD terminal through system information. The system information for transmitting information for the random access resources may be separately transmitted system information that is distinct from system information for terminals supporting different versions of standards within a cell (e.g., an existing TDD terminal).

[0589] The base station may be able to distinguish whether the TDD terminal supporting different versions of the standard performs random access or the SBFD terminal performs random access by setting separate random access resources for the TDD terminal and the SBFD terminal supporting different versions of the standard. For example, the separate random access resource set for the SBFD terminal may be a resource that the existing TDD terminal determines to be a downlink time resource, and the SBFD terminal performs random access through an uplink resource (or a separate random access resource) set to a part of the frequency of the downlink time resource, so that the base station may determine that the terminal attempting random access through the uplink resource is an SBFD terminal.

[0590] Alternatively, the base station may not set up separate random access resources for SBFD terminals, but may set up common random access resources for all terminals within the cell. In this case, configuration information for the random access resources may be transmitted to all terminals within the cell through system information, and the SBFD terminal that has received the system information may perform random access to the random access resources. Thereafter, the SBFD terminal may complete the random access process and proceed to RRC connection mode for transmitting and receiving data with the cell. After the RRC connection mode, the SBFD terminal may receive an upper layer or physical signal from the base station that can determine that some frequency resources of the downlink time resources are set uplink resources, and may perform SBFD operations, for example, transmit uplink signals on the uplink resources.

[0591] When the SBFD terminal determines that the cell supports SBFD, the terminal may transmit capability information to the base station, including at least one or more of whether the terminal supports SBFD, whether full-duplex communication or half-duplex communication is supported, and the number of transmit or receive antennas it has (or supports), thereby notifying the base station that the terminal attempting to connect is an SBFD terminal. Alternatively, when half-duplex communication support is a mandatory implementation for the SBFD terminal, whether or not the half-duplex communication is supported may be omitted from the capability information. The SBFD terminal may report the capability information to the base station through a random access procedure, may report to the base station after completing the random access procedure, or may report to the base station after proceeding to an RRC connection mode for transmitting and receiving data with the cell.

[0592] The above SBFD terminal may support half-duplex communication, which performs only uplink transmission or downlink reception at a time, like a conventional TDD terminal, or may support full-duplex communication, which performs both uplink transmission and downlink reception at a time. Accordingly, whether the above half-duplex communication or full-duplex communication is supported can be reported to the base station by the SBFD terminal through a capability report, and after the report, the base station can configure the SBFD terminal to transmit and receive using half-duplex communication or full-duplex communication. When the SBFD terminal reports the capability for the above half-duplex communication to the base station, since a duplexer generally does not exist, a switching gap may be required to change the RF between transmission and reception when operating in FDD or TDD.

[0593] FIG. 20 is a diagram illustrating an example of SBFD operation in a TDD band of a wireless communication system to which the present disclosure is applied.

[0594] Fig. 20(a) illustrates a case where TDD is operated in a specific frequency band. In a cell where TDD is operated, a base station can transmit and receive signals including data / control information in downlink slots (or symbols), uplink slots (or symbols) (2001), and flexible slots (or symbols) based on settings for TDD UL-DL resource configuration information indicating downlink slot (or symbol) resources and uplink slot (or symbol) resources of TDD with an existing TDD terminal or SBFD terminal.

[0595] In Fig. 20, it can be assumed that the DDDSU slot format is set according to the TDD UL-DL resource configuration information. Here, 'D' is a slot composed entirely of downlink symbols, 'U' is a slot composed entirely of uplink symbols, and 'S' is a slot that is not 'D' or 'U', that is, a slot that includes a downlink symbol or an uplink symbol or a flexible symbol. Here, for convenience, it can be assumed that S is composed of 12 downlink symbols and 2 flexible symbols. In addition, the DDDSU slot format can be repeated according to the TDD UL-DL resource configuration information. That is, the repetition period of the TDD configuration is 5 slots (5 ms for 15 kHz SCS, 2.5 ms for 30 kHz SCS, etc.).

[0596] Next, FIGS. 20(b), 20(c) and 20(d) illustrate cases where SBFD is operated together with TDD in a specific frequency band.

[0597] Referring to FIG. 20(b), the terminal may configure a portion of the frequency band of the cell as a frequency band (2010) capable of uplink transmission. This band may be referred to as an uplink subband (UL subband). The uplink subband (UL subband) may be applied to all symbols of all slots. The terminal may transmit an uplink channel or signal scheduled for all symbols (2012) within the subband (UL subband). However, the terminal may not transmit an uplink channel or signal in a band other than the subband (UL subband).

[0598] Referring to Fig. 20(c), the terminal may set some of the frequency bands of the cell as a frequency band (2020) capable of uplink transmission, and may set a time region in which the frequency band is activated. Here, this frequency band may be called an uplink subband (UL subband). In Fig. 20(c), the uplink subband (UL subband) is deactivated in the first slot, and the uplink subband (UL subband) may be activated in the remaining slots. Accordingly, the terminal may transmit an uplink channel or signal in the uplink subband (UL subband) (2022) of the remaining slots. Therefore, although the uplink subband (UL subband) is activated in units of slots here, whether it is activated or not may be set in units of symbols.

[0599] Referring to FIG. 20(d), a terminal may be configured with time-frequency resources capable of uplink transmission. The terminal may configure one or more time-frequency resources as time-frequency resources capable of uplink transmission. For example, some frequency bands (2032) of the first and second slots may be configured as time-frequency resources capable of uplink transmission. Additionally, some frequency bands (2033) of the third slot and some frequency bands (2034) of the fourth slot may be configured as time-frequency resources capable of uplink transmission.

[0600] In the following description, a time-frequency resource capable of uplink transmission within a downlink symbol or slot may be referred to as an SBFD resource. Furthermore, a symbol within a downlink symbol for which an uplink subband is configured may be referred to as an SBFD symbol. Furthermore, a time-frequency resource capable of downlink reception within an uplink symbol or slot may be referred to as an SBFD resource. Furthermore, a symbol within an uplink symbol for which a downlink subband is configured may be referred to as an SBFD symbol.

[0601] For convenience, in the present disclosure, a band in which downlink channels or signals can be received, excluding uplink sub-bands, is referred to as a downlink sub-band. A terminal can configure at most one uplink sub-band and at most two downlink sub-bands in one symbol. For example, a terminal can be configured with one of {uplink sub-band, downlink sub-band}, {downlink sub-band, uplink sub-band}, or {first downlink sub-band, uplink sub-band, second downlink sub-band} in the frequency domain.

[0602] FIG. 21 is a diagram illustrating an SBFD setting according to one embodiment of the present disclosure.

[0603] Referring to FIG. 21, the terminal may be configured with an uplink symbol, a downlink symbol, or a flexible symbol according to the TDD configuration. Here, all symbols in the 'D' slot are downlink symbols. All symbols in the 'U' slot are uplink symbols. The 'S' slot is a slot that is not a 'D' slot or a 'U' slot. The terminal may be configured with a UL BWP (2120). In addition, the terminal may be configured with a UL subband (2110) in a DL symbol. In addition, the terminal may be configured with a slot or a symbol to which the UL subband (2110) is to be applied. Referring to FIG. 21, the UL subband may be applied only to some symbols among the DL symbols of the TDD periodicity. The UL subband may be applied to the DL symbols of the second and third slots, but the UL subband may not be applied to the other DL symbols. Here, the SBFD symbol can represent a symbol to which the UL subband is applied.

[0604] The base station can set a guard frequency interval between the DL sub-band and the UL sub-band in the terminal. When the guard frequency interval is set for the terminal, frequency resources in the frequency domain can be divided into a UL sub-band, a guard frequency interval, and a DL sub-band. For the purpose of explaining the present embodiment, it is assumed that the guard frequency interval is included in the UL sub-band. That is, in the following description, the expression 'if 'X' overlaps with the UL sub-band' can be interpreted as 'if 'X' overlaps with the UL sub-band or the guard frequency interval'. In addition, the expression 'if 'X' overlaps with the UL sub-band' can be interpreted as 'if 'X' does not overlap with the DL sub-band'.

[0605] The expression 'if X does not overlap with a UL sub-band' can be interpreted as 'if X does not overlap with a UL sub-band and a Guard frequency interval.' Furthermore, the expression 'if X does not overlap with a UL sub-band' can be interpreted as 'if X overlaps with a DL sub-band.'

[0606] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. The contents of the present disclosure can be applied to FDD, TDD and / or XDD (and / or SBFD, full duplex) systems. In the present disclosure below, upper signaling (or upper layer signaling) refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of a physical layer, or a terminal transmits a signal to a base station using an uplink data channel of a physical layer, and may also be referred to as RRC signaling, PDCP signaling, or MAC (medium access control) control element (MAC control element; MAC CE).

[0607] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority.

[0608] In the present disclosure below, the above examples are described through a number of embodiments, but they are not independent and one or more embodiments may be applied simultaneously or in combination.

[0609] For convenience in the following description of the present disclosure, cells, transmission points, panels, beams, and / or transmission directions, which can be distinguished through upper layer / L1 parameters such as TCI state or spatial relation information, or indicators such as cell ID, TRP ID, and panel ID, may be uniformly described as TRP (transmission reception point), beam, or TCI state. Therefore, when the present disclosure is actually applied, TRP, beam, or TCI state may be appropriately replaced with one of the above terms.

[0610] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having a specific format for the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or including a specific indicator that indicates whether cooperative communication is applied, or having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied scrambled with a specific RNTI, or assuming cooperative communication is applied in a specific section indicated by a higher layer. For the convenience of the following description, the case where the terminal receives a PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as an NC-JT case.

[0611] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Although embodiments of the present disclosure are described below using a 5G system as an example, embodiments of the present disclosure may be applied to other communication systems having similar technical backgrounds or channel types. For example, LTE or LTE-A mobile communication and mobile communication technologies developed after 5G may be included here. Therefore, embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure as determined by a person skilled in the art. The contents of the present disclosure can be applied to FDD, TDD, XDD (or SBFD, full duplex) systems.

[0612] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents throughout this specification.

[0613] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0614] - MIB (Master Information Block)

[0615] - SIB (System Information Block) or SIB

[0616] - RRC (Radio Resource Control)

[0617] - MAC (Medium Access Control) CE (Control Element)

[0618] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the following physical layer channels or signaling.

[0619] - PDCCH (Physical Downlink Control Channel)

[0620] - DCI (Downlink Control Information)

[0621] - UE-specific DCI

[0622] - Group common DCI

[0623] - Common DCI

[0624] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0625] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0626] - PUCCH (Physical Uplink Control Channel)

[0627] - UCI (Uplink Control Information)

[0628] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority.

[0629] The term “slot” used in the present disclosure below is a general term that may refer to a specific time unit corresponding to a TTI (Transmit Time Interval), and may specifically mean a slot used in a 5G NR system, or a slot or subframe used in a 4G LTE system.

[0630] In the following description of the present disclosure, the simultaneous transmission and reception of specific signals / channels may not necessarily mean that the specific signals / channels must be transmitted and received at the same time. For example, the simultaneous transmission and reception of specific signals / channels may include that the specific signals / channels are generated based on the same (or a single) information / signal / channel. For example, the simultaneous transmission and reception of specific signals / channels may include that the specific signals / channels are transmitted and received within the same (or a single) time interval / resource.

[0631] In the present disclosure below, the above examples are described through a number of embodiments, but they are not independent and one or more embodiments may be applied simultaneously or in combination.

[0632] <First Embodiment: Method for Setting and Indicating PUSCH Precoding Frequency Resource Units>

[0633] As one embodiment of the present disclosure, a frequency domain precoding resource unit applicable to a terminal during PUSCH transmission is described. This embodiment can operate in combination with other embodiments. For example, the frequency domain precoding resource unit applicable to PUSCH transmission defined in the first embodiment can be identically defined in other embodiments.

[0634] The frequency resource units of precoding that a terminal can apply when transmitting PUSCH can be broadly divided into two types.

[0635] The first is wideband, where the entire frequency resource for which a terminal is scheduled for PUSCH transmission can serve as a frequency resource unit for precoding. That is, the terminal can apply the same precoding to all frequency resource regions where PUSCH is transmitted.

[0636] Second, the terminal can divide the frequency resources scheduled for PUSCH transmission into two or more parts, and the frequency resource units corresponding to each part (for example, the frequency resource unit can be composed of one or more RBs) can become the frequency resource units for precoding. That is, when transmitting a single PUSCH, the terminal can apply different precodings to different frequency resources (or different frequency resource units) of the PUSCH transmission.

[0637] More specifically, the terminal may consider at least one combination of the following methods for the frequency resource unit of precoding applicable to PUSCH transmission. For example, the terminal may receive the frequency resource unit of PUSCH precoding from the base station and / or determine the frequency resource unit of precoding based on one or more combinations of the following methods. In the present disclosure, the frequency resource unit of PUSCH precoding other than wideband may be understood as a subband, but is not limited thereto.

[0638] Unless specifically stated otherwise, in the description of one embodiment of the present disclosure, the frequency resource unit-specific indicators within the DCI may be applied to each frequency resource unit in ascending order of index, but are not limited thereto. For example, the first TPMI field and / or the first SRI field within the DCI may be applied to the first frequency resource unit, and the second TPMI field and / or the second SRI field within the DCI may be applied to the second frequency resource unit.

[0639] [Method 1-1]

[0640] The terminal can be configured with a frequency resource unit for PUSCH precoding from the base station through higher layer signaling. For example, the terminal can be configured with at least one of the following values ​​for the number of RBs corresponding to a wideband or an arbitrary natural number such as 2, 4, 6, 8, 16, 32, or 64 through higher layer signaling: For example, the number of RBs other than the wideband configured through higher layer signaling can be a configuration for a subband (e.g., the size of the subband).

[0641] If the setting value is wideband, the terminal can consider the frequency resource unit of PUSCH precoding as the entire frequency resource scheduled from the base station for PUSCH transmission.

[0642] If the setting value is X (X=any natural number such as 2, 4, 6, 8, 16, 32, 64, etc.), the terminal can divide the frequency resources scheduled from the base station for PUSCH transmission into X RB units and apply the frequency resource unit of PUSCH precoding. For example, if the setting value is 2, the terminal can divide the frequency resources scheduled from the base station for PUSCH transmission into 2 RB units and apply the frequency resource unit of PUSCH precoding. At this time, the frequency resource unit of PUSCH precoding can be applied based on CRB0 (common resource block #0) or can be considered from the start RB of the bandwidth portion. If the frequency resource unit of PUSCH precoding is applied based on CRB0, the UE may apply the same precoding to RBs that are smaller than or equal to the frequency resource unit of PUSCH precoding, if the PUSCH transmission includes the RB with the lowest index of the bandwidth part (i.e., the first physical resource block (PRB) in the bandwidth part) or the RB with the highest index (i.e., the last PRB in the bandwidth part), depending on how far the start RB of the activated bandwidth part in which the PUSCH transmission is scheduled is from CRB0. If the frequency resource unit of PUSCH precoding is considered from the start RB of the bandwidth part, if the frequency resource unit of PUSCH precoding is not a divisor of the size of the bandwidth part, the same precoding may be applied to RBs that are smaller than or equal to the frequency resource unit of PUSCH precoding, if the PUSCH precoding includes the RB with the highest index of the bandwidth part (i.e., the last PRB in the bandwidth part).

[0643] When using [Method 1-1], if the frequency resource unit of PUSCH precoding is not wideband, the number of frequency resource units of PUSCH precoding can be semi-statically determined based on the size of each bandwidth portion set to the terminal (which can be expressed as the number of RBs, for example) and the frequency resource unit of PUSCH precoding (which can be expressed as the number of RBs corresponding to a specific natural number, such as 2 RBs, for example). In this case, the terminal can expect that the number of TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 that can be received from the base station within a specific bandwidth portion exists as many as the number of frequency resource units of PUSCH precoding. In this case, if multiple TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 received by the terminal indicate different information, the terminal can perform PUSCH transmission by applying the information indicated through the DCI to each frequency resource unit of PUSCH precoding. Alternatively, if multiple TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 received by the UE all indicate the same information, the UE may perform PUSCH transmission by applying the same information to all allocated frequency resources. That is, if all subband indicators in the DCI have the same value, the same information may be applied to all allocated frequency resources when transmitting the PUSCH, which may be understood as precoding for the wideband. That is, dynamic switching between wideband precoding and subband precoding may be supported by the DCI, and this may depend on whether all subband indicators in the DCI have the same value. For example, if they all have the same value, it may be wideband precoding, and if not, it may be subband precoding.This can be equally applied to the description of the present disclosure as well as to the present embodiment.

[0644] [Method 1-2]

[0645] The terminal can determine the size of the frequency resource unit for PUSCH precoding based on the size of the bandwidth portion set for the terminal. The terminal and the base station can define multiple ranges of bandwidth portion sizes and determine different sizes of frequency resource units for PUSCH precoding for each range. Multiple bandwidth portion sizes can be defined / set in advance between the terminal and the base station, and the size and / or number of frequency resource units for PUSCH precoding can be determined for each range.

[0646] For example, as shown in [Table 34] below, the bandwidth portion size ranges are defined into four types, and the terminal can determine the size of the frequency resource unit of PUSCH precoding for each range. In Table 34 below, the bandwidth portion size is the number of RBs, and each configuration is the number of RBs, which is the size of the frequency resource unit of PUSCH precoding corresponding to the range of the size of each bandwidth portion. This is an example, and the present disclosure is not limited thereto.

[0647] At this time, the terminal can receive one of the second to fourth columns (Configuration 1-3) of [Table 34] below from the base station through upper layer signaling, and can determine the size of the frequency resource unit of PUSCH precoding based on the setting and the size of the bandwidth portion. What is indicated through upper layer signaling may be a column and / or a Configuration index, but is not limited thereto.

[0648] Alternatively, instead of selecting one of the second to fourth columns of [Table 34] below via higher layer signaling as described above, one of the second to fourth columns may be fixedly defined without setting higher layer signaling. For example, the same Configuration may be applied to all bandwidth portion size ranges, and / or a Configuration different from the Configuration for other bandwidth portion size ranges may be applied to at least one bandwidth portion size range. For example, when the bandwidth portion size is 30 RB, the UE and the base station may fixedly use the second column (Configuration 1) to define the frequency resource unit of PUSCH precoding, and at this time, the UE may determine the frequency resource unit of PUSCH precoding to be 4 RB within the bandwidth portion. In this case, [Table 34] below is only one example, and the above [Method 1-2] may not be limited thereto.

[0649] [Table 34]

[0650]

[0651] When defining a frequency resource unit of PUSCH precoding within a bandwidth portion, the UE may apply it based on CRB0 or ​​consider it from the start RB of the bandwidth portion. If the frequency resource unit of PUSCH precoding is applied based on CRB0, the UE may apply the same precoding to RBs that are less than or equal to the frequency resource unit of PUSCH precoding, depending on how far the start RB of the activated bandwidth portion where PUSCH transmission is scheduled is from CRB0, if the PUSCH transmission includes the RB with the lowest index of the bandwidth portion (i.e., the first PRB within the bandwidth portion) or the RB with the highest index (i.e., the last PRB within the bandwidth portion). If the frequency resource unit of PUSCH precoding is considered from the start RB of the bandwidth part, if the frequency resource unit of PUSCH precoding is not a divisor of the size of the bandwidth part, the same precoding can be applied to RBs that are smaller than or equal to the frequency resource unit of PUSCH precoding, in the case where the RB of the highest index of the bandwidth part (i.e., the last PRB in the bandwidth part) is included.

[0652] When using [Method 1-2], the terminal can determine the frequency resource unit of PUSCH precoding according to the size of a specific bandwidth portion, and can determine the number of frequency resource units of PUSCH precoding within the corresponding bandwidth portion. In this case, the terminal can expect that the number of TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 that can be received from the base station within the specific bandwidth portion exists as many as the number of frequency resource units of PUSCH precoding. In this case, if multiple TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 received by the terminal indicate different information, the terminal can perform PUSCH transmission by applying the information indicated through the DCI to each frequency resource unit of PUSCH precoding. Alternatively, if multiple TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 received by the terminal all indicate the same information, the terminal can perform PUSCH transmission by applying the same information to all frequency resources allocated during PUSCH transmission.

[0653] [Method 1-3]

[0654] The terminal can receive from the base station a maximum value for the number of frequency resource units of PUSCH precoding through upper layer signaling, and the terminal can expect that multiple TPMI fields and / or multiple SRI fields corresponding to the maximum value are present in the DCI. In addition, the terminal can be instructed through the DCI the actual number of frequency resource units of PUSCH precoding that can be applied to a scheduled PUSCH. Through this, the terminal can interpret multiple TPMI fields and / or multiple SRI fields as many as the number of actual frequency resource units instructed to the terminal, and individually apply precoding to each frequency resource unit of PUSCH precoding to perform PUSCH transmission.

[0655] For example, if the terminal receives from the base station the maximum value for the number of frequency resource units of PUSCH precoding set to 4, the terminal can expect a total of 4 TPMI fields and / or 4 SRI fields to exist in the DCI. The terminal can be instructed through the DCI about the number of frequency resource units to actually be used out of the maximum 4 frequency resource units, and the instruction can be made explicitly through an additional field in the DCI or implicitly through multiple TPMI fields and / or multiple SRI fields.

[0656] - If the terminal is instructed about the number of frequency resource units to be actually used among the total frequency resource units through a new field explicitly added in the DCI, the terminal can interpret the information of the corresponding number of TPMI fields and / or SRI fields and apply them when PUSCH transmissions are scheduled through the same DCI. That is, the TPMI field and / or SRI field of the DCI can be applied to PUSCH transmissions scheduled by the corresponding DCI. At this time, the terminal can use as many TPMI fields and / or SRI fields as the number of frequency resource units to be actually used, starting from the first TPMI field and / or the first SRI field. The terminal can expect to receive the remaining TPMI fields and / or SRI fields as reserved values, expect all bits to be indicated as 0, or ignore them.

[0657] - If the terminal is instructed about the number of frequency resource units to be actually used among the total frequency resource units through existing fields in the DCI (e.g., multiple TPMI fields and / or multiple SRI fields), the terminal can expect to receive code points other than reserved code points for as many TPMI fields and / or SRI fields as the number of frequency resource units to be actually used, starting from the first TPMI field and / or the first SRI field. The terminal can expect to receive the remaining TPMI fields and / or SRI fields as reserved values.

[0658] When using [Method 1-3], the maximum number of frequency resource units of PUSCH precoding can be set semi-statically to the terminal. In this case, the terminal can expect that the number of TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 that can be received from the base station within a specific bandwidth portion exists as many as corresponding to the maximum value. In this case, if multiple TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 received by the terminal indicate different information, the terminal can perform PUSCH transmission by applying the information indicated through the DCI to each frequency resource unit of PUSCH precoding. Alternatively, if multiple TPMI fields and / or SRI fields in DCI format 0_1 ​​or 0_2 received by the terminal all indicate the same information, the terminal can perform PUSCH transmission by applying the same information to all allocated frequency resources. Alternatively, if the terminal is instructed about the number of frequency resource units to be actually used among the entire frequency resource units through a new field that can be explicitly included in the DCI format 0_1 ​​or 0_2 received by the terminal, and if the value is 1, the terminal can perform PUSCH transmission by equally applying the information obtainable through the first TPMI field and / or the first SRI field to the entire frequency resource allocated for PUSCH transmission.

[0659] [Method 1-4]

[0660] The terminal can determine the size of the frequency resource unit allocated during PUSCH transmission according to the frequency resource allocation method of PUSCH transmission.

[0661] - In one detailed method, the terminal can determine the number and size of frequency resource units allocated for PUSCH transmission depending on whether the frequency resource allocation for PUSCH transmission is continuous or discontinuous.

[0662] ■ If a terminal is scheduled for continuous frequency resource allocation for PUSCH transmission, the terminal can apply the same precoding to all frequency resources. That is, the number of frequency resource units can be 1, and the size of the frequency resource unit can be the frequency resource allocation for PUSCH transmission. That is, if a continuous frequency resource allocation is scheduled for PUSCH transmission, wideband precoding can be applied.

[0663] ■ If a terminal is scheduled for discontinuous frequency resource allocation for PUSCH transmission, the terminal can apply individual precoding to each consecutive frequency resource among the entire frequency resource allocation region. For example, if the terminal is scheduled for the 1st to 5th RB and the 10th to 20th RB within a specific bandwidth portion as frequency resource allocation regions, the terminal can apply the first precoding to the 1st to 5th RB and the second precoding to the 11th to 20th RB, and the first precoding and the second precoding can have the same or different degrees of freedom. That is, the number of frequency resource units can be determined as the number of consecutive frequency resource portions among the entire frequency resource allocation, and the size of the frequency resource unit can be determined as the size of each consecutive frequency resource portion. In the above example, the number of frequency resource units is 2, and the size of the frequency resource unit may be 5 RB for the first consecutive frequency resource portion to which the first precoding can be applied, and 10 RB for the second consecutive frequency resource portion to which the second precoding can be applied.

[0664] - In another detailed method, the terminal can determine the size and number of frequency resource units allocated for PUSCH transmission according to the frequency resource allocation of the PUSCH transmission. The terminal can be notified of one or more reference values ​​of the frequency resource allocation from the base station through at least one combination of upper layer signaling, MAC-CE, and L1 signaling, or can use one or more values ​​fixedly defined in the standard. As an example, there can be a total of three reference values ​​of the frequency resource allocation, and the values ​​can be 36RB, 72RB, and 144RB considered in the first column of [Table 34] above. In this case, if the terminal receives frequency resource allocation information less than 36RB for PUSCH transmission, the terminal can consider the number of frequency resource units as 1. If the terminal receives frequency resource allocation information greater than or equal to 36RB and less than 72RB for PUSCH transmission, the terminal can consider the number of frequency resource units as 2. If the UE receives frequency resource allocation information greater than or equal to 72 RBs and less than 144 RBs for PUSCH transmission, the UE may consider the number of frequency resource units to be 4. If the UE receives frequency resource allocation information greater than or equal to 144 RBs and less than 275 RBs for PUSCH transmission, the UE may consider the number of frequency resource units to be 8.

[0665] For [Method 1-4], the terminal may be notified of the maximum number of frequency resource units from the base station through at least one combination of upper layer signaling, MAC-CE, and L1 signaling, or may use a value fixedly defined in the standard. The terminal may not expect to receive frequency resource allocation information from the base station that derives a number of frequency resource units exceeding the maximum number of the corresponding frequency resource units. In this case, the terminal may expect that the number of TPMI fields and / or SRI fields, respectively, corresponding to the maximum value, exist in DCI format 0_1 ​​or 0_2 that can be received from the base station within a specific bandwidth portion. The terminal may interpret fields corresponding to the number of frequency resource units from the first TPMI field and / or the first SRI field, depending on the number of frequency resource units determined through the frequency resource allocation information, and apply each TPMI field and / or each SRI field to each frequency resource unit. For example, if the maximum number of frequency resource units is 4 and the number of frequency resource units determined based on the frequency resource allocation information is 2, the terminal can expect that there are 4 TPMI fields or / and 4 SRI fields in DCI format 0_1 ​​or 0_2, and can apply information obtainable through the first and second TPMI fields or / and the first and second SRI fields to the first and second frequency resource units, respectively.

[0666] The terminal may be notified by the base station via at least one combination of upper layer signaling, MAC-CE, and L1 signaling to use at least one combination of the above [Method 1-1] to [Method 1-4], or at least one combination may be fixedly defined in the standard. For example, [Method 1-1] may be defined as a method fixed in the standard as a method for the terminal to determine a PUSCH precoding frequency resource unit. As another example, the terminal may be notified by the base station via at least one combination of upper layer signaling, MAC-CE, and L1 signaling to use one of the above [Method 1-1], [Method 1-3], or [Method 1-4]. The above may be merely examples, and other combinations may not be excluded.

[0667] In addition, if the terminal is defined in the standard to use a method in which at least one of the above [Method 1-1] to [Method 1-4] is combined, and if the combined method is not notified to the terminal through a combination of at least one of the upper layer signaling, MAC-CE, and L1 signaling from the base station, another combined method in which at least one of the above [Method 1-1] to [Method 1-4] is combined may be used.

[0668] The terminal may transmit a terminal capability report to the base station, which means that it supports at least one of the above [Methods 1-1] to [Methods 1-4], and there may be corresponding upper layer signaling at the base station to support the corresponding function, or there may not be corresponding upper layer signaling. For example, the corresponding upper layer signaling may be related to configuration information of the base station corresponding to the terminal capability report, but is not limited thereto.

[0669] If there is a higher layer signaling corresponding to the terminal capability reported by the terminal, the terminal may determine a PUSCH precoding frequency resource unit based on at least one combination of [Method 1-1] to [Method 1-4] when the higher layer signaling is not configured by the base station, or may use at least one combination of [Method 1-1] to [Method 1-4] that is fixedly defined. In addition, if there is no higher layer signaling corresponding to the terminal capability reported by the terminal, the terminal may expect the base station to perform an operation corresponding to the terminal capability when the terminal reports the terminal capability.

[0670] For the above [Method 1-1] to [Method 1-4], if the terminal is connected to a cell operating with the SBFD, the terminal can be notified of at least one combination of upper layer signaling, MAC-CE, and L1 signaling for the uplink subband from the base station.

[0671] At this time, the terminal may consider at least one combination, which is the same or different, of [Method 1-1] to [Method 1-4] for determining PUSCH precoding frequency resource units for cells operating in SBFD and cells not operating in SBFD. That is, the methods for determining PUSCH precoding frequency resource units may be applied identically or differently for cells operating in SBFD and cells not operating in SBFD.

[0672] In addition, the terminal may consider at least one combination, which is the same or different, of [Method 1-1] to [Method 1-4] for determining a PUSCH precoding frequency resource unit for an SBFD slot or symbol and an uplink slot or symbol within a cell operating in SBFD. That is, the method for determining a PUSCH precoding frequency resource unit may be applied identically or differently for different time resources within a cell operating in SBFD.

[0673] Unless specifically stated otherwise, in the description of an embodiment of the present disclosure described above, a plurality of SRS resources corresponding to a plurality of SRI fields in the DCI may be included in the same (or one) SRS resource set. For example, a precoding operation and / or an mTRP operation as in an embodiment of the present disclosure may be distinguished depending on the number of SRS resource sets in which usage is set to codebook or non-codebook. For example, the operations may be distinguished as follows. However, this is an example, and the present disclosure is not limited thereto.

[0674] - For example, if the number of SRS resource sets is 1, it can operate as single-TRP. Here, if frequency resource unit-based precoding is not possible (for example, if only the above-described wideband precoding is possible), if the usage of the SRS resource set is codebook, the SRI field and TPMI field can be 1 each, and if the usage of the SRS resource set is non-codebook, the SRI field can be 1.

[0675] - For example, if the number of SRS resource sets is 1 and frequency resource unit-based precoding is possible, depending on the setting of frequency resource units and / or frequency resource unit precoding (e.g., the number of frequency resource units), if the usage of the SRS resource set is codebook, there may be one SRI field and multiple TPMI fields. Here, one SRI field may correspond to an SRS resource set whose usage is codebook. For example, if the usage of the SRS resource set is non-codebook, there may be multiple SRI fields, and the multiple SRI fields may correspond to one SRS resource set whose usage is set to non-codebook.

[0676] - For example, when the number of SRS resource sets is 2, it can operate as M-TRP. Here, when frequency resource unit-based precoding is not possible (for example, only the wideband precoding described above is possible), multiple SRI fields can be associated with M-TRP. For example, when usage is codebook, two SRI fields (and two TPMI fields) can correspond to the first / second SRS resource sets, respectively. For example, when usage is non-codebook, two SRI fields can correspond to the first / second SRS resource sets, respectively.

[0677] - For example, if the number of SRS resource sets is 2 and frequency resource unit-based precoding is possible, depending on the configuration of frequency resource units and / or frequency resource unit precoding (e.g., the number of frequency resource units), if the usage of the SRS resource set is codebook, there may be two SRI fields and multiple TPMI fields. Here, the two SRI fields may correspond to the first / second SRS resource sets, respectively. For example, if the usage of the SRS resource set is non-codebook, there may be multiple SRI fields. Here, among the multiple SRI fields, the first half SRI field may correspond to the first SRS resource set, and the second half SRI field may correspond to the second SRS resource set.

[0678] <Example 2: Non-codebook-based PUSCH transmission scheme considering partial band precoding>

[0679] In one embodiment of the present disclosure, a non-codebook-based PUSCH transmission method of a terminal is described based on the size and number of the PUSCH precoding frequency resource units determined as described above. This embodiment can operate in combination with other embodiments. For example, the frequency resource units of precoding applicable to PUSCH transmission defined in the first embodiment can be equally defined in other embodiments, and the same definition can also be equally applied to the non-codebook-based PUSCH transmission method considered in the second embodiment.

[0680] If the terminal determines the PUSCH precoding frequency resource unit to be one and applies the same precoding to the entire frequency resource for PUSCH transmission, the precoding method may be called wideband precoding. In addition, if the terminal determines the PUSCH precoding frequency resource unit to be two or more and applies individual precoding to two or more different portions of the frequency resource for PUSCH transmission, the precoding method may be called subband precoding.

[0681] More specifically, the terminal may consider a combination of at least one of the following methods for a non-codebook based PUSCH transmission scheme considering partial band precoding.

[0682] [Method 2-1]

[0683] FIG. 22 is a diagram illustrating one method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to one embodiment of the present disclosure.

[0684] The terminal can receive an associated CSI-RS from the base station (2200). Based on the associated CSI-RS, the terminal can estimate the channel between the base station and the terminal, and then calculate a precoder to be used for non-codebook-based PUSCH transmission based on this (2210, 2211). At this time, the terminal can calculate the same precoder for all frequency resource regions for which it wishes to calculate a precoder (2212, 2213, 2214, 2215). In other words, the terminal can calculate a wideband precoder.

[0685] Afterwards, the terminal can apply each layer vector of the calculated overall precoding matrix to each SRS resource and transmit it to the base station. The layer value of the overall precoding matrix and the number of SRS resources can be determined according to the terminal capability report of the terminal and the upper layer signaling setting of the base station (or at least one of the terminal capability report of the terminal and the upper layer signaling setting of the base station). Accordingly, the terminal can apply each layer vector of the entire precoding matrix consisting of up to four layers to each of up to four SRS resources, and transmit one or more SRS resources to which the precoding matrix calculated by the terminal is applied to the base station (2212, 2213, 2214, 2215). For example, the terminal can apply W to each of the first to fourth SRS resources. (1) (2212) to W (4) (2215) can be applied respectively, and at this time W (k) may be a precoding vector corresponding to the kth layer among the precoding matrices calculated by the terminal.

[0686] A terminal may report to a base station as a terminal capability the maximum number of SRS resources that can be simultaneously transmitted for one or more SRS resources to which a precoding matrix is ​​applied (2220). If the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within an SRS resource set in which usage is set to non-codebook is an aperiodic SRS, the terminal may not expect that the time interval from the time of receiving the associated CSI-RS to the time of transmission for one or more SRS resources to which precoding is applied is less than 42 symbols. That is, if the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within an SRS resource set in which usage is set to non-codebook is an aperiodic SRS, the terminal may estimate a channel based on the associated CSI-RS, calculate a precoder, apply precoding to the SRS resource, and use a time corresponding to at least 42 symbols to transmit the channel (2210).

[0687] A base station that has received one or more SRS resources to which precoding has been applied can determine a combination of SRS resources that is judged to have the best reception performance for each PUSCH precoding frequency resource unit, and a combination of precoders applied to the selected one or more SRS resources can be determined as a precoder of a terminal for non-codebook-based PUSCH transmission in the corresponding PUSCH precoding frequency resource unit (2230).

[0688] For example, the base station can determine the rank value of non-codebook-based PUSCH transmission to be scheduled to the terminal as 2. The base station can determine W as a combination of precoders applicable to each of H1 (2231), H2 (2232), H3 (2233), and H4 (2234), which are sub-band channels corresponding to four PUSCH precoding frequency resource units. (1) and W (2) (2235), W (2) and W (3) (2236), W (2) and W (4) (2237), and W (3) and W (4) (2238) can be determined.

[0689] That is, even if the precoder calculated by the terminal and applied to the SRS resource and transmitted is calculated identically for all frequency resource areas in which the terminal wishes to calculate the precoder, the base station can schedule partial-band precoding-based PUSCH transmission to the terminal by selecting a different combination of precoders for each PUSCH transmission frequency resource unit.

[0690] At this time, the base station can determine a combination of one or more SRS resources so that the rank value is the same for all PUSCH precoding frequency resource units. The terminal can receive the same or different SRIs from the base station for each PUSCH precoding frequency resource unit (2240). The method by which the base station indicates the SRI through DCI may be as follows. For example, a combination of at least one of the following methods may be used.

[0691] - [SRI Indication Method 2-1-1] The terminal may expect that multiple SRI fields are included in DCI format 0_1 ​​and 0_2. In this case, each of the multiple SRI fields may indicate a combination of one or more SRS resources, including rank information. If N SRS resources are set in an SRS resource set in which usage is set to non-codebook, the bit length of each SRI field may be a bit length that can express the number of cases in which 1 SRS resource is selected from among N SRS resources or the number of cases in which N SRS resources are selected from among N SRS resources, so 2 N - It can be N bits, which is the bit length that can represent 1 code point.

[0692] - [SRI Indication Method 2-1-2] The terminal may expect that multiple SRI fields are included in DCI format 0_1 ​​and 0_2. At this time, the first SRI field among the multiple SRI fields may indicate a combination of one or more SRS resources including rank information, and the remaining SRI fields may indicate a combination of one or more SRS resources without rank information. If N SRS resources are set in an SRS resource set in which usage is set to non-codebook, the bit length of the first SRI field may be a bit length that can express all of the cases in which one SRS resource is selected among the N SRS resources, the number of cases in which two SRS resources are selected, or the number of cases in which N SRS resources are selected, so 2 N- It can be N bits, which is the bit length that can express 1 code point. Based on the rank information indicated from the first SRI field, assuming that the rank value in all PUSCH precoding frequency resource units is the same, the remaining SRI fields other than the first SRI field can have a bit length that can express the number of cases in which one or more SRS resources are selected assuming the rank value indicated by the first SRI field. If 2 SRS resources out of N are indicated through the first SRI field, the rank can be 2, and the remaining SRI fields can all have a bit length that can express the number of cases in which a combination of 2 SRS resources out of N is selected assuming the rank value is 2. In this case, since the rank value that can be indicated through the first SRI field can change dynamically, each of the remaining SRI fields can have a bit length that can express the maximum value among the number of cases in which a combination of SRS resources corresponding to any rank out of N is selected considering all rank values. That is, the bit length of the remaining SRI fields other than the first SRI field is , where k is one of the values ​​that can be the rank. or can be a value that maximizes the bit length of the remaining SRI fields other than the first SRI field. and here is the number of SRS resources, can be the maximum number of layers.

[0693] - [SRI Indication Method 2-1-3] The terminal can expect that DCI format 0_1 ​​and 0_2 include one rank indication field and multiple SRI fields. The terminal can expect that the rank value is indicated through the rank indication field. In addition, each of the multiple SRI fields can have a bit length that can express the number of cases in which one or more SRS resources are selected assuming the rank value indicated by the rank indication field, assuming that the rank values ​​in all PUSCH precoding frequency resource units are the same. If the rank indicated through the rank indication field is 2, and if N SRS resources are configured in the SRS resource set in which the usage is set to non-codebook, the multiple SRI fields can all have a bit length that can express the number of cases in which a combination of two SRS resources among the N is selected assuming the rank value is 2. At this time, since the rank value that can be indicated through the rank indication field can change dynamically, each of the remaining SRI fields can have a bit length that can express the maximum value among the cases of selecting a combination of SRS resources corresponding to any rank among N by considering all rank values. That is, the bit length of the SRI field is , where k is one of the values ​​that can be rank (or can be indicated by the rank indication field). or It can be the value that maximizes .

[0694] - [SRI Indication Method 2-1-4] It can be expected that one rank indication field and one SRI field are included in DCI format 0_1 ​​and 0_2. At this time, the terminal can expect that the rank value is indicated through the rank indication field. In addition, the terminal can expect that each code point of one SRI field indicates a combination of one or more SRS resources selected for each of multiple PUSCH precoding frequency resource units. For example, if N SRS resources are configured in an SRS resource set in which usage is set to non-codebook, if there are two PUSCH precoding frequency resource units and the rank indicated by the rank indication field is 1, one code point of one SRI field can include both SRS resource selection information for one of the N SRS resources for the first PUSCH precoding frequency resource unit and SRS resource selection information for one of the N SRS resources for the second PUSCH precoding frequency resource unit.

[0695] For the above [SRI indication method 2-1-1] to [SRI indication method 2-1-3], if multiple SRI fields all indicate the same information or if the remaining SRI fields other than a specific SRI field (for example, the first field) indicate reserved codepoints, the terminal may apply full-band precoding when transmitting non-codebook PUSCH, and if not (i.e., if different information is indicated in at least two of the multiple SRI fields), the terminal may perform non-codebook PUSCH transmission by applying partial-band precoding.

[0696] For the above [SRI indication method 2-1-4], if the same information is indicated in all of the multiple PUSCH precoding frequency resource units that can be indicated by one SRI field, the terminal can apply full-band precoding when transmitting non-codebook PUSCH, and if not (i.e., if different information is indicated in at least two of the multiple PUSCH precoding frequency resource units that can be indicated by one SRI field), the terminal can perform non-codebook PUSCH transmission by applying partial-band precoding.

[0697] A terminal that has received information on the SRI field and rank indication field through DCI can perform non-codebook-based PUSCH transmission using full-band precoding or partial-band precoding based on the information (2250).

[0698] [Method 2-1] may be suitable, especially when each sub-band is composed of very wide frequency resources (e.g., a band of 100 MHz or more / exceeding it), as the spatial signal propagation characteristics between the base station and the terminal may differ between the sub-bands, since the base station can independently select precoding information for each sub-band. In addition, there may be an advantage in that the precoder calculation complexity of the terminal does not increase because the terminal can calculate the same precoder for the entire band when calculating the precoder to be applied to the SRS resource based on the associated CSI-RS. However, there may be a disadvantage in that the overhead of the SRI field to be included in the DCI to be transmitted by the base station may increase.

[0699] [Method 2-2]

[0700] FIG. 23 is a diagram illustrating another method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to an embodiment of the present disclosure.

[0701] A terminal can receive an associated CSI-RS from a base station (2300). Based on the associated CSI-RS, the terminal can estimate the channel between the base station and the terminal, and then calculate a precoder to be used for non-codebook-based PUSCH transmission based on the estimated channel (2310, 2311). At this time, the terminal can calculate the same precoder for all frequency resource regions for which the terminal wishes to calculate a precoder (2312, 2313, 2314, 2315). In other words, the terminal can calculate a wideband precoder. Afterwards, the terminal can apply each layer vector of the calculated overall precoding matrix to each SRS resource and transmit it to the base station. The layer values ​​of the overall precoding matrix and the number of SRS resources can be determined based on the terminal capability report of the terminal and the upper layer signaling configuration of the base station (or at least one of the terminal capability report of the terminal and the upper layer signaling configuration of the base station). Accordingly, the terminal can transmit one or more SRS resources to which the precoding matrix calculated by the terminal is applied to the base station by applying the vector for each layer of the entire precoding matrix consisting of up to four layers to up to four SRS resources (2312, 2313, 2314, 2315). For example, the terminal can apply W to each of the first to fourth SRS resources. (1) (2312) to W (4) (2315) can be applied respectively, and at this time W (k) may be a precoding vector corresponding to the kth layer among the precoding matrices calculated by the terminal.

[0702] A terminal may report to a base station as a terminal capability the maximum number of SRS resources that can be simultaneously transmitted for one or more SRS resources to which a precoding matrix is ​​applied (2320). If the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within an SRS resource set in which usage is set to non-codebook is an aperiodic SRS, the terminal may not expect that the time interval from the time of receiving the associated CSI-RS to transmission for one or more SRS resources to which precoding is applied is less than 42 symbols. That is, if the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within an SRS resource set in which usage is set to non-codebook is an aperiodic SRS, the terminal may estimate a channel based on the associated CSI-RS, calculate a precoder, apply precoding to the SRS resource, and use a time corresponding to at least 42 symbols to transmit the channel (2310).

[0703] A base station that has received one or more SRS resources with precoding applied can determine one combination of SRS resources that is judged to have the best reception performance for all PUSCH precoding frequency resource units (2335, 2336), and based on the combination of selected / determined SRS resources, can additionally indicate to the terminal the phase difference (2341, 2342, 2343, 2344) that can be applied to each PUSCH precoding frequency resource unit.

[0704] For example, the base station can determine the rank value of non-codebook-based PUSCH transmission to be scheduled to the terminal as 2. The base station can determine W as a combination of precoders that can be commonly applied to all sub-band channels corresponding to four PUSCH precoding frequency resource units, H1 (2331), H2 (2332), H3 (2333), and H4 (2334). (1) (2335) and W (2) (2336) can be determined. In addition to the combination of the precoders, the base station can individually apply a phase value for each sub-band channel to offset the influence of each sub-band channel as much as possible. (2341), (2342), (2343), and (2344) can be determined.

[0705] That is, even if the precoder calculated by the terminal and applied to the SRS resource and transmitted is calculated identically for all frequency resource areas in which the terminal wishes to calculate the precoder, the base station can schedule partial-band precoding-based PUSCH transmission to the terminal by selecting a common combination of precoders for the entire PUSCH transmission frequency resource unit and deriving an additional phase difference for each PUSCH transmission frequency resource unit and instructing the terminal.

[0706] The base station can define one or more phase value indication fields for each PUSCH precoding frequency resource unit to indicate additional phase values ​​in the DCI to the terminal. Through the one or more fields, the base station can indicate the phase value corresponding to each PUSCH transmission frequency resource unit differently for each layer, can indicate it only for the remaining layers except for the first layer, or can indicate it commonly for all layers. In addition, the base station can indicate one SRI field for all PUSCH precoding frequency resource units to the terminal, and the SRI field can express a common precoder combination to be applied to all PUSCH precoding frequency resource units.

[0707] The terminal may apply full-band precoding when transmitting a non-codebook PUSCH if all phase value indication fields for each frequency resource unit indicate the same information or if the first field indicates a specific value and the remaining fields indicate reserved codepoints. Otherwise (i.e., if at least two different pieces of information are indicated through the phase value indication fields for each frequency resource unit), the terminal may perform a non-codebook PUSCH transmission by applying partial-band precoding.

[0708] A terminal that has received information on the SRI field and the phase value indication field for each PUSCH precoding frequency resource unit through DCI can perform non-codebook-based PUSCH transmission applying full-band precoding or partial-band precoding based on the information (2350).

[0709] [Method 2-2] may be suitable in that, although precoding information for each sub-band is not independently selected compared to [Method 2-1] when the entire band is composed of relatively narrow frequency resources (for example, a band of 100 MHz or less), the spatial signal propagation characteristics between the base station and the terminal for each sub-band may be similar, and the phase difference for each sub-band can be offset by indicating the same precoding information to all sub-bands through the SRI field. In addition, since the terminal can calculate the same precoder for the entire band when calculating the precoder to be applied to the SRS resource based on the associated CSI-RS, there may be an advantage in that the precoder calculation complexity of the terminal does not increase and the overhead of the SRI field does not increase. However, there may be a disadvantage in that there may be an additional overhead of the phase information field to be included as many as the number of sub-bands in the DCI to be transmitted by the base station.

[0710] [Method 2-3]

[0711] FIG. 24 is a diagram illustrating another method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to an embodiment of the present disclosure.

[0712] A terminal can receive an associated CSI-RS from a base station (2400). Based on the associated CSI-RS, the terminal can estimate the channel between the base station and the terminal, and then calculate a precoder to be used for non-codebook-based PUSCH transmission based on the estimated channel (2410, 2411, 2416). At this time, the terminal can calculate individual precoders for different frequency resource regions for each sub-band during channel estimation (2412, 2413, 2414, 2415). That is, the terminal can calculate a sub-band precoder, and additional terminal capabilities for this can be reported. For example, terminal capabilities for calculating a sub-band precoder can be reported.

[0713] Accordingly, the terminal may allow additional time consumption compared to the method of calculating the same precoder for the entire band (2416). Therefore, the terminal may not expect that the time interval from the time of receiving the associated CSI-RS to transmission for one or more SRS resources to which precoding has been applied is less than 42 + d symbols if the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within the SRS resource set with usage set to non-codebook is an aperiodic SRS. That is, the terminal may use a time corresponding to at least 42 + d symbols to estimate the channel based on the associated CSI-RS, calculate the precoder, apply precoding to the SRS resource, and transmit it if the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within the SRS resource set with usage set to non-codebook is an aperiodic SRS (2410, 2416).

[0714] At this time, d, which means additional time, can be any natural number meaning time expressed by the number of additionally allowed symbols, and the d value can be notified from the base station to the terminal using a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, or can be a value reported as a terminal capability, or a value fixedly defined in the standard, and can have a different value depending on the subcarrier of the activated bandwidth portion set for the terminal.

[0715] The terminal can apply each layer vector of the calculated overall precoding matrix to each SRS resource and transmit it to the base station. The layer value of the overall precoding matrix and the number of SRS resources can be determined according to the terminal capability report of the terminal and the upper layer signaling configuration of the base station (or at least one of the terminal capability report of the terminal and the upper layer signaling configuration of the base station). Accordingly, the terminal can apply each layer vector of the entire precoding matrix composed of up to four layers to each of up to four SRS resources, and transmit one or more SRS resources to which the precoding matrix calculated by the terminal is applied to the base station (2412, 2413, 2414, 2415). For example, the terminal can apply W1 to the first to fourth sub-bands among the frequency resources of the first SRS resource transmitted in four sub-bands, respectively. (1) Inland W1 (4) (2412) can be applied, and at this time W t (k) may be a precoding vector corresponding to the kth layer in the tth subband among the precoding matrices calculated by the terminal.

[0716] A terminal can report to a base station the maximum number of SRS resources that can be transmitted simultaneously for one or more SRS resources to which a precoding matrix is ​​applied as a terminal capability (2420).

[0717] A base station that has received one or more SRS resources with precoding applied can determine one combination of SRS resources that is judged to have the best reception performance for all PUSCH precoding frequency resource units (2435, 2436). For example, the base station can determine the rank value of non-codebook-based PUSCH transmission to be scheduled to the terminal as 2. The base station can apply W1 to the first SRS resource and the second SRS resource as a combination of precoders that can be commonly applied to all sub-band channels corresponding to four PUSCH precoding frequency resource units, namely H1 (2431), H2 (2432), H3 (2433), and H4 (2434). (1) Inland W4 (1) (2435) and W1 (2) Inland W4 (2) (2436) can be determined. That is, since the precoder calculated by the terminal and applied to the SRS resource and transmitted is individually calculated for each sub-band for which the terminal wishes to calculate the precoder, a combination of one or more SRS resources for the entire band can be selected to schedule PUSCH transmission based on sub-band precoding to the terminal without deriving a combination of individual precoders for each sub-band.

[0718] When the terminal calculates the precoder to be applied to one or more SRS resources equally across the entire band, the terminal can apply full-band precoding when transmitting a non-codebook PUSCH using a combination of one or more SRS resources indicated by the base station; otherwise (i.e., when calculating individual precoders for each sub-band), the terminal can perform non-codebook PUSCH transmission by applying partial-band precoding.

[0719] A terminal that has received SRI field information through DCI can perform non-codebook-based PUSCH transmission using full-band precoding or partial-band precoding based on the information (2450).

[0720] [Method 2-3] allows the terminal to calculate the same precoding for the entire band or different precodings for each subband and apply them to the SRS resource and transmit them based on the frequency selectivity of the channel determined by the terminal upon receiving the associated CSI-RS. This allows the terminal to have the freedom to perform either partial-band or full-band precoding, and since only one SRI field is involved, there may be no additional overhead in the DCI. However, since the terminal may have the burden of calculating different precoders for each subband, the implementation complexity of the terminal may increase, and additional time may be consumed, which may increase the delay from the time the channel is estimated through the associated CSI-RS to the non-codebook-based PUSCH transmission.

[0721] [Method 2-4]

[0722] FIG. 25 is a diagram illustrating another method of a non-codebook based PUSCH transmission process considering partial band precoding of a base station and a terminal according to an embodiment of the present disclosure.

[0723] A terminal can receive an associated CSI-RS from a base station (2500). Based on the associated CSI-RS, the terminal can estimate the channel between the base station and the terminal, and then calculate a precoder to be used for non-codebook-based PUSCH transmission based on the channel estimate (2510, 2511, 2516). At this time, the terminal can calculate individual precoders for different frequency resource regions for each sub-band during channel estimation (2512, 2513, 2514, 2515). That is, the terminal can calculate a sub-band precoder, and additional terminal capabilities for this can be reported. For example, terminal capabilities for calculating a sub-band precoder can be reported.

[0724] Accordingly, the terminal may allow additional time consumption compared to calculating the same precoder for the entire band (2516). Therefore, the terminal may not expect that the time interval from the time of receiving the associated CSI-RS to transmission of one or more SRS resources with precoding applied is less than 42 + d symbols if the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within the SRS resource set with usage set to non-codebook is an aperiodic SRS. That is, the terminal may estimate the channel based on the associated CSI-RS, calculate the precoder, apply precoding to the SRS resource, and use a time corresponding to at least 42 + d symbols to transmit the SRS resource if the associated CSI-RS is an aperiodic CSI-RS and an SRS resource within the SRS resource set with usage set to non-codebook is an aperiodic SRS (2510, 2516).

[0725] At this time, d, which means additional time, can be any natural number meaning time expressed by the number of additionally allowed symbols, and the d value can be notified from the base station to the terminal using a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, or can be a value reported as a terminal capability, or a value fixedly defined in the standard, and can have a different value depending on the subcarrier of the activated bandwidth portion set for the terminal.

[0726] The terminal can apply each layer vector of the calculated overall precoding matrix to each SRS resource and transmit it to the base station. The layer value of the overall precoding matrix and the number of SRS resources can be determined according to the terminal capability report of the terminal and the upper layer signaling configuration of the base station (or at least one of the terminal capability report of the terminal and the upper layer signaling configuration of the base station). Accordingly, the terminal can apply each layer vector of the entire precoding matrix composed of up to four layers to each of up to four SRS resources, and transmit one or more SRS resources to which the precoding matrix calculated by the terminal is applied to the base station (2512, 2513, 2514, 2515). For example, the terminal can apply W1 to the first to fourth sub-bands among the frequency resources of the first SRS resource transmitted in four sub-bands. (1) Inland W1 (4) (2512) can be applied, and at this time W t (k) may be a precoding vector corresponding to the kth layer in the tth subband among the precoding matrices calculated by the terminal.

[0727] A terminal can report to a base station the maximum number of SRS resources that can be transmitted simultaneously for one or more SRS resources to which a precoding matrix is ​​applied as a terminal capability (2520).

[0728] A base station that has received one or more SRS resources to which precoding is applied can determine a combination of SRS resources that is judged to have the best reception performance for each PUSCH precoding frequency resource unit, and a combination of precoders applied to the selected one or more SRS resources can be determined as a precoder of a terminal for non-codebook-based PUSCH transmission in the corresponding PUSCH precoding frequency resource unit (2530). For example, the base station can determine a rank value of non-codebook-based PUSCH transmission to be scheduled to the terminal as 2. The base station can determine W1 as a combination of precoders that can be applied to H1 (2531), H2 (2532), H3 (2533), and H4 (2534), which are sub-band channels corresponding to four PUSCH precoding frequency resource units, respectively. (1) and W1 (2) (2535), W2 (2) and W2 (3) (2536), W3 (2) and W3 (4) (2537), and W4 (3) and W4 (4) (2538) can be determined. That is, the precoder calculated by the terminal and applied to the SRS resource and transmitted is individually calculated for each sub-band for which the terminal wishes to calculate the precoder, and the base station can also schedule PUSCH transmission based on sub-band precoding to the terminal by selecting a different combination of precoders for each PUSCH transmission frequency resource unit.

[0729] At this time, the base station can determine a combination of one or more SRS resources so that the rank value is the same for all PUSCH precoding frequency resource units. The terminal can receive the same or different SRI from the base station for each PUSCH precoding frequency resource unit (2540). The method by which the base station indicates the SRI through DCI can be a combination of one or more of the above [SRI Indication Method 2-1-1] to [SRI Indication Method 2-1-4].

[0730] For the above [SRI indication method 2-1-1] to [SRI indication method 2-1-3], if multiple SRI fields all indicate the same information or if the remaining SRI fields other than a specific SRI field (for example, the first field) indicate reserved codepoints, the terminal may apply full-band precoding when transmitting non-codebook PUSCH, and if not (i.e., if different information is indicated in at least two of the multiple SRI fields), the terminal may perform non-codebook PUSCH transmission by applying partial-band precoding.

[0731] For the above [SRI indication method 2-1-4], if the same information is indicated in all of the multiple PUSCH precoding frequency resource units that can be indicated by one SRI field, the terminal can apply full-band precoding when transmitting non-codebook PUSCH, and if not (i.e., if different information is indicated in at least two of the multiple PUSCH precoding frequency resource units that can be indicated by one SRI field), the terminal can perform non-codebook PUSCH transmission by applying partial-band precoding.

[0732] A terminal that has received information about the SRI field and rank indication field through DCI can perform non-codebook-based PUSCH transmission using full-band precoding or partial-band precoding based on the information (2550).

[0733] [Method 2-4] can achieve optimal performance when transmitting non-codebook-based PUSCH with partial-band precoding, as the terminal can calculate individual precoders for each sub-band, and the base station can also instruct the terminal on the optimal precoder combination from the receiving standpoint. In addition, since the base station can independently select precoding information for each sub-band, it may be particularly suitable when each sub-band is composed of very wide frequency resources (for example, a band of 100 MHz or more / exceeding that), as the spatial signal propagation characteristics between the base station and the terminal may differ between each sub-band. However, since the terminal may have the burden of calculating different precoders for each sub-band, the implementation complexity of the terminal may increase, and additional time may be consumed, which may increase the delay from the time of channel estimation through the associated CSI-RS to non-codebook-based PUSCH transmission, and there may be a disadvantage in that the overhead of the SRI field...

Claims

1. In a method performed by a terminal in a communication system, A step of receiving a first configuration for a CSI-RS (channel state information reference signal) and a second configuration for an SRS (sounding reference signal) through upper layer signaling; A step of identifying a plurality of first precoders for a plurality of SRS resources associated with the second configuration based on measurements for CSI-RS resources associated with the first configuration; A step of performing SRS transmission on the plurality of SRS resources based on the plurality of first precoders; A step of receiving DCI (downlink control information) for scheduling PUSCH (physical uplink shared channel) through PDCCH (physical downlink control channel); A step of identifying a plurality of second precoders for a plurality of subbands included in a wideband to which the PUSCH is allocated based on the DCI, the plurality of second precoders being at least some of the plurality of first precoders; and A method comprising the step of transmitting the PUSCH based on applying the plurality of second precoders to the plurality of subbands.

2. In paragraph 1, A method wherein a second precoder for one subband is identified as one or a combination of one or more of the plurality of first precoders, and the number of second precoders for one subband is equal to a rank for the PUSCH.

3. In the first paragraph, the processing time of the terminal for the plurality of first precoders is: In the case where the above plurality of first precoders are identified by the terminal for the wideband, 42 symbols are defined, A method wherein the plurality of first precoders are defined as 42+d symbols for the case where the plurality of subbands are identified by the terminal, and d is related to the number of the plurality of subbands.

4. In paragraph 1, the DCI: It includes a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, and the number of bits included in each SRI field is the number N of the plurality of SRS resources, or A plurality of SRI fields are included, wherein a first SRI field among the plurality of SRI fields indicates a second precoder for the rank and a corresponding subband, and the number of bits included in the first SRI field is N, and each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicates a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes or It includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes , or A method comprising one field indicating the rank and one SRI field, wherein code points of the one SRI field indicate the plurality of second precoders.

5. In paragraph 1, If one precoder is identified based on the DCI, the PUSCH is transmitted based on applying the one precoder to the wideband, A method wherein, when the one precoder is identified: the plurality of second precoders are identified as being identical based on the DCI, or one of the plurality of second precoders is identified based on the DCI and the remaining precoders of the plurality of second precoders except the one precoder are identified as reserved.

6. At the terminal of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Receive a first configuration for CSI-RS (channel state information reference signal) and a second configuration for SRS (sounding reference signal) via upper layer signaling; Identifying a plurality of first precoders for a plurality of SRS resources associated with the second configuration based on measurements for CSI-RS resources associated with the first configuration; Performing SRS transmission on the plurality of SRS resources based on the plurality of first precoders; Receive DCI (downlink control information) for scheduling PUSCH (physical uplink shared channel) through PDCCH (physical downlink control channel); Identifying a plurality of second precoders for a plurality of subbands included in a wideband to which the PUSCH is allocated based on the DCI, the plurality of second precoders being at least some of the plurality of first precoders; and A terminal configured to transmit the PUSCH based on applying the plurality of second precoders to the plurality of subbands.

7. In paragraph 6, A terminal, wherein a second precoder for one subband is identified as one or a combination of one or more of the plurality of first precoders, and the number of second precoders for one subband is equal to a rank for the PUSCH.

8. In the 6th paragraph, the processing time of the terminal for the plurality of first precoders is: In the case where the above plurality of first precoders are identified by the terminal for the wideband, 42 symbols are defined, A terminal, wherein the plurality of first precoders are defined as 42+d symbols for the case where the plurality of subbands are identified by the terminal, and d is related to the number of the plurality of subbands.

9. In paragraph 6, the DCI: It includes a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, and the number of bits included in each SRI field is the number N of the plurality of SRS resources, or A plurality of SRI fields are included, wherein a first SRI field among the plurality of SRI fields indicates a second precoder for the rank and a corresponding subband, and the number of bits included in the first SRI field is N, and each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicates a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes or It includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes , or A terminal comprising one field indicating the rank and one SRI field, wherein a code point of the one SRI field indicates the plurality of second precoders.

10. In paragraph 6, If one precoder is identified based on the DCI, the PUSCH is transmitted based on applying the one precoder to the wideband, A terminal, wherein when the one precoder is identified: the plurality of second precoders are identified as being identical based on the DCI, or when one of the plurality of second precoders is identified based on the DCI and the remaining precoders except the one precoder among the plurality of second precoders are identified as being reserved.

11. In a method performed by a base station in a communication system, A step of transmitting a first configuration for a CSI-RS (channel state information reference signal) and a second configuration for an SRS (sounding reference signal) through upper layer signaling; A step of receiving SRS from a plurality of SRS resources related to the second setting; A step of identifying a plurality of first precoders for said plurality of SRS resources, said plurality of first precoders being associated with said first configuration; A step of identifying a plurality of second precoders for a plurality of subbands included in a wideband to which a PUSCH (physical uplink shared channel) is allocated, wherein the plurality of second precoders are at least some of the plurality of first precoders; A step of transmitting DCI (downlink control information) for scheduling the PUSCH through a PDCCH (physical downlink control channel), the DCI being related to the plurality of second precoders; and A method comprising the step of receiving the PUSCH based on application of the plurality of second precoders to the plurality of subbands.

12. In paragraph 11, A method wherein a second precoder for one subband is identified as one or a combination of one or more of the plurality of first precoders, and the number of second precoders for one subband is equal to a rank for the PUSCH.

13. In paragraph 1, the DCI: It includes a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, and the number of bits included in each SRI field is the number N of the plurality of SRS resources, or A plurality of SRI fields are included, wherein a first SRI field among the plurality of SRI fields indicates a second precoder for the rank and a corresponding subband, and the number of bits included in the first SRI field is N, and each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicates a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes or It includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes , or A method comprising one field indicating the rank and one SRI field, wherein code points of the one SRI field indicate the plurality of second precoders.

14. In the base station of the communication system, Transmitter and receiver; and A processor coupled to the transceiver, the processor comprising: Transmitting a first configuration for CSI-RS (channel state information reference signal) and a second configuration for SRS (sounding reference signal) via upper layer signaling; Receive SRS from multiple SRS resources related to the second setting; Identifying a plurality of first precoders for said plurality of SRS resources, said plurality of first precoders being associated with said first configuration; Identifying a plurality of second precoders for a plurality of subbands included in a wideband to which a physical uplink shared channel (PUSCH) is allocated, the plurality of second precoders being at least some of the plurality of first precoders; Transmitting DCI (downlink control information) for scheduling the PUSCH through a PDCCH (physical downlink control channel), the DCI being related to the plurality of second precoders; and A base station configured to receive the PUSCH based on the application of the plurality of second precoders to the plurality of subbands.

15. In paragraph 14, the DCI: It includes a plurality of SRI (SRS resource indicator) fields, each SRI field indicating a rank for the PUSCH and a second precoder for a corresponding subband, and the number of bits included in each SRI field is the number N of the plurality of SRS resources, or A plurality of SRI fields are included, wherein a first SRI field among the plurality of SRI fields indicates a second precoder for the rank and a corresponding subband, and the number of bits included in the first SRI field is N, and each of the remaining SRI fields except the first SRI field among the plurality of SRI fields indicates a second precoder for a corresponding subband, and the number of bits included in each of the remaining SRI fields is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes or It includes one field indicating the rank and a plurality of SRI fields, each SRI field indicating a second precoder for a corresponding subband, and the number of bits included in each SRI field is , and the above k is one of the values ​​that can be the above rank. is the value that maximizes , or A base station comprising one field indicating the rank and one SRI field, wherein code points of the one SRI field indicate the plurality of second precoders.

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