Method and device for reporting power headroom for plurality of uplink support base stations 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 operations of a user equipment and a base station in a wireless communication system. In the present disclosure, a method by which a terminal performs communication may: report terminal capability information to a base station in order to perform initial access; receive, from the base station, an RRC configuration message for identifying a candidate beam; transmit an SRS to the base station on the basis of the RRC message; receive, from the base station, an RRC reconfiguration message including configuration information for supporting UL-only TRP; and transmit power information for the candidate beam to the base station through a MAC CE on the basis of the RRC reconfiguration message.

Description

Power headroom reporting method and device for a base station supporting multiple uplinks 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 power headroom reporting method for supporting multiple uplink-supporting base stations in network cooperative communications, 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] According to one embodiment of the present disclosure, a method for a terminal to perform communication may include a step of reporting terminal capability information to a base station to perform an initial access. The method may include a step of receiving an RRC (Radio Resource Control) configuration message for identifying a candidate beam from the base station. The method may include a step of transmitting an SRS (Sounding Reference Signal) to the base station based on the RRC message. The method may include a step of receiving an RRC reconfiguration message including configuration information for supporting an Uplink (UL) only Transmission Reception Point (TRP) from the base station. The method may include a step of transmitting power information for the candidate beam to the base station using a MAC CE (Medium Access Control Control Element) based on the RRC reconfiguration message.

[0010] According to one embodiment of the present disclosure, a terminal for performing communication in a wireless communication system may be provided, and the terminal may include a transceiver and at least one processor connected to the transceiver. The at least one processor may report terminal capability information to a base station to perform an initial access. The at least one processor may receive an RRC (Radio Resource Control) configuration message for identifying a candidate beam from the base station. The at least one processor may transmit an SRS (Sounding Reference Signal) to the base station based on the RRC message. The at least one processor may receive an RRC reconfiguration message including configuration information for supporting an UL (Uplink) only TRP (Transmission Reception Point) from the base station. The at least one processor may transmit power information for the candidate beam to the base station using a MAC CE (Medium Access Control Control Element) based on the RRC reconfiguration message.

[0011] According to one embodiment of the present disclosure, a method for a base station to perform communication may include receiving terminal capability information from a terminal to perform an initial access. The method may include transmitting an RRC (Radio Resource Control) configuration message for identifying a candidate beam to the terminal. The method may include receiving an SRS (Sounding Reference Signal) from the terminal based on the RRC message. The method may include transmitting an RRC reconfiguration message including configuration information for supporting an Uplink (UL) only Transmission Reception Point (TRP) to the terminal. The method may include receiving power information for the candidate beam from the terminal through a MAC CE (Medium Access Control Control Element) based on the RRC reconfiguration message.

[0012] FIG. 1 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.

[0013] FIG. 2 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0014] FIG. 3 illustrates a process for beam setting and activation of a PDSCH according to one embodiment of the present disclosure.

[0015] FIG. 4 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.

[0016] FIG. 5 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.

[0017] FIG. 6 is a diagram illustrating an Enhanced PDSCH TCI state activation / deactivation MAC-CE structure according to one embodiment of the present disclosure.

[0018] FIG. 7 is a diagram illustrating an example of the operation of a base station and a terminal operating in multiple TRPs, including a TRP that supports only an uplink reception function according to one embodiment of the present disclosure.

[0019] FIGS. 8A to 8C illustrate a MAC CE format for a terminal to report power headroom to a base station according to one embodiment of the present disclosure.

[0020] FIG. 9 illustrates an example of a case in which multiple UL only TRPs are operated according to one embodiment of the present disclosure.

[0021] FIGS. 10A through 10C illustrate a new MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams according to one embodiment of the present disclosure.

[0022] FIGS. 11A through 11C illustrate another novel MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams according to one embodiment of the present disclosure.

[0023] FIGS. 12A through 12C illustrate another novel MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams according to one embodiment of the present disclosure.

[0024] FIGS. 13A to 13C illustrate a MAC CE format capable of collectively indicating the type of reference signal in an area for identifying a candidate beam according to one embodiment of the present disclosure.

[0025] FIG. 14 illustrates an operation flow diagram of a base station and a terminal for supporting UL only TRP according to one embodiment of the present disclosure.

[0026] FIG. 15 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0027] FIG. 16 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0028] FIG. 17 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.

[0029] FIG. 18 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.

[0030] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0031] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0032] 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.

[0033] 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 these may vary depending on the intention or custom of the user or operator. Therefore, their definitions should be made based on the contents throughout the specification.

[0034] 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, the downlink (DL) refers to a wireless transmission path of a signal transmitted from the base station to the terminal, and the uplink (UL) refers to a wireless transmission path of a signal transmitted from the terminal to the 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.

[0035] 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).

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 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 user equipment (UE). The above multiple access method typically allocates and operates 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, thereby distinguishing the data or control information of each user.

[0040] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers, and thus support services that simultaneously satisfy these 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).

[0041] 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.

[0042] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage due to the nature of the service, and thus may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0043] Finally, URLLC refers to cellular-based wireless communication services used for specific mission-critical purposes. Examples include remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, URLLC communications must offer extremely low latency and high reliability. For example, URLLC-enabled services must meet air interface latency requirements of less than 0.5 milliseconds and a packet error rate (PER) of 10-5 or lower. Therefore, for URLLC-enabled services, 5G systems must provide shorter Transmit Time Intervals (TTIs) than other services, while simultaneously allocating extensive resources in the frequency band to ensure communication link reliability.

[0044] 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.

[0045] Hereinafter, a / b can be understood as at least one of a or b.

[0046] [PDCCH: DCI related]

[0047] Below, downlink control information (DCI) in a 5G system is described in detail.

[0048] 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.

[0049] 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.

[0050] 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).

[0051] 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 1] below.

[0052] [Table 1]

[0053]

[0054] 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 2] below.

[0055] [Table 2]

[0056]

[0057] 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 3] below.

[0058] [Table 3]

[0059]

[0060] 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 4] below.

[0061] [Table 4]

[0062]

[0063] [PDCCH: CORESET, REG, CCE, Search Space]

[0064] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0065] FIG. 1 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 according to an embodiment of the present disclosure. FIG. 1 illustrates an example in which two control regions (Control Region #1 (101), Control Region #2 (102)) are set within a UE bandwidth part (110) in the frequency axis and within one slot (120) in the time axis. The control regions (101, 102) may be set to specific frequency resources (103) within the entire UE bandwidth part (110) 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, 104). Referring to the illustrated example in FIG. 1, Control Region #1 (101) is set to a control region length of two symbols, and Control Region #2 (102) is set to a control region length of one symbol.

[0066] In the aforementioned 5G, the control region can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, the frequency location of the control region, and the symbol length of the control region. For example, this information may include the information in [Table 5] below.

[0067] [Table 5]

[0068]

[0069] In [Table 5], 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.

[0070] FIG. 2 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 one embodiment of the present disclosure. According to FIG. 2, the basic unit of time and frequency resources that constitute a control channel can be referred to as a REG (Resource Element Group, 203), and a REG (203) can be defined as 1 OFDM symbol (201) on the time axis and 1 PRB (Physical Resource Block, 202) on the frequency axis, i.e., 12 subcarriers. A base station can configure a downlink control channel allocation unit by concatenating REGs (203).

[0071] As illustrated in FIG. 2, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 804), 1 CCE (804) can be composed of multiple REGs (203). Taking the REG (203) illustrated in FIG. 2 as an example, the REG (203) can be composed of 12 REs, and if 1 CCE (204) is composed of 6 REGs (203), 1 CCE (204) can be composed of 72 REs. When a downlink control region is established, the region can be composed of multiple CCEs (204), and a specific downlink control channel can be mapped to one or multiple CCEs (204) and transmitted according to the aggregation level (AL) within the control region. CCEs (204) within the control area are distinguished by numbers, and the numbers of the CCEs (204) can be assigned according to a logical mapping method.

[0072] The basic unit of the downlink control channel illustrated in Fig. 2, that is, the REG (203), may include both the REs to which the DCI is mapped and the areas to which the DMRS (205), which is a reference signal for decoding the REs, is mapped. As in Fig. 2, three DMRSs (205) may be transmitted within one REG (203). 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.

[0073] 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.

[0074] 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 6] below can be included.

[0075] [Table 6]

[0076]

[0077]

[0078] 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.

[0079] 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.

[0080] 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.

[0081] - 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

[0082] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0083] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0084] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0085] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0086] 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.

[0087] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0088] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0089] The RNTIs specified may follow the definitions and uses below.

[0090] - C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes.

[0091] - TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes.

[0092] - CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0093] - RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0094] - P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0095] - SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0096] - INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0097] - TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0098] - TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0099] - TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0100] The aforementioned specified DCI formats may follow the definitions in [Table 7] below.

[0101] [Table 7]

[0102]

[0103] 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.

[0104] [Mathematical Formula 1]

[0105] ...Mathematical formula (1)

[0106] - : Integration level

[0107] - : Carrier Index

[0108] - : Total number of CCEs existing within the control region p

[0109] - : slot index

[0110] - : Number of PDCCH candidates for aggregation level L

[0111] - : PDCCH candidate index of aggregation level L

[0112] -

[0113] -,

[0114] - : Terminal identifier

[0115] The value can be 0 for a common search space.

[0116] 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.

[0117] In 5G, since multiple search space sets can be configured with different parameters (e.g., parameters in [Table 6]), 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 monitor either search space set #1 or search space set #2 in a specific slot.

[0118] [PUCCH: Transmission Related]

[0119] In the NR system, a terminal can transmit control information (UCI) to a base station via the PUCCH. The control information may include at least one of the following: HARQ-ACK, which indicates whether demodulation / decoding of a TB (transport block) received by the terminal via the PDSCH was successful; SR (scheduling request), which requests resource allocation from the PUSCH base station for uplink data transmission; and channel state information (CSI), which is information for reporting the channel status of the terminal.

[0120] PUCCH resources can be broadly categorized into long PUCCH and short PUCCH, depending on the length of the allocated symbols. In NR systems, long PUCCHs are four or more symbols long within a slot, while short PUCCHs are two or fewer symbols long within a slot.

[0121] More specifically, Long PUCCH can be used for uplink cell coverage enhancement purposes, and thus can be transmitted using DFT-S-OFDM, a single-carrier transmission method, rather than OFDM transmission. Long PUCCH supports transmission formats such as PUCCH format 1, PUCCH format 3, and PUCCH format 4, depending on the number of control information bits that can be supported and whether terminal multiplexing is supported through Pre-DFT OCC support in front of the IFFT.

[0122] First, PUCCH format 1 is a long PUCCH format based on DFT-S-OFDM that can support up to 2 bits of control information and uses frequency resources equivalent to 1 RB. Control information can be composed of a combination of HARQ-ACK and SR, or each of them. PUCCH format 1 is composed of OFDM symbols containing a demodulation reference signal (or reference signal), DMRS (DeModulation Reference Signal), and OFDM symbols containing UCI, which are repeatedly transmitted.

[0123] For example, if the number of transmission symbols of PUCCH format 1 is 8 symbols, it can be composed of DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol in order from the first start symbol of 8 symbols. The DMRS symbol is an orthogonal code (or orthogonal sequence or spreading code,) in the time axis in a sequence corresponding to the length of 1 RB in the frequency axis within one OFDM symbol. It can be spread using and transmitted after performing IFFT.

[0124] The UCI symbol is generated by the terminal modulating 1-bit control information with BPSK and 2-bit control information with QPSK to generate d(0), scrambling the generated d(0) by multiplying it by a sequence corresponding to the length of 1 RB in the frequency axis, and then applying an orthogonal code (or orthogonal sequence or spreading code,) to the scrambled sequence in the time axis. ) can be used to spread the signal and then transmitted after performing IFFT.

[0125] The terminal generates a sequence based on the group hopping or sequence hopping setting and the set ID set by the upper layer signaling from the base station, and cyclically shifts the generated sequence with the initial CS (cyclic shift) value set by the upper layer signal to generate a sequence corresponding to the length of 1 RB.

[0126] Given the length of the spreading sign (NSF), It is determined as follows, and is specifically given as in [Table 8] below. i means the index of the spreading code itself, and m means the index of the elements of the spreading code. Here, the numbers in [ ] in [Table 11] are , for example, if the length of the spreading code is 2 and the index of the set spreading code is i=0, the spreading code silver , Became this =

[0011] becomes.

[0127] [Table 8]

[0128]

[0129] Next, PUCCH format 3 is a long PUCCH format based on DFT-S-OFDM that can support control information exceeding 2 bits. The number of RBs used can be configured through upper layers. Control information can be composed of HARQ-ACK, SR, and CSI, or a combination thereof. The DMRS symbol positions in PUCCH format 3 are presented in [Table 9] below, depending on whether frequency hopping occurs within a slot and whether additional DMRS symbols are configured.

[0130] [Table 9]

[0131]

[0132] For example, if the number of transmission symbols of PUCCH format 3 is 8, DMRS is transmitted in the 1st and 5th symbols, starting with the first start symbol of the 8 symbols as 0. [Table 9] is applied in the same way to the DMRS symbol positions of PUCCH format 4.

[0133] Next, PUCCH format 4 is a long PUCCH format based on DFT-S-OFDM that can support control information exceeding 2 bits, and uses frequency resources equivalent to 1 RB. The control information can be composed of HARQ-ACK, SR, and CSI, or a combination thereof. What differentiates PUCCH format 4 from PUCCH format 3 is that PUCCH format 4 can multiplex PUCCH format 4 of multiple terminals within one RB. Multiplexing of PUCCH format 4 of multiple terminals is possible by applying Pre-DFT OCC (Orthogonal Cover Code) to the control information before the IFFT. However, the number of control information symbols that can be transmitted by one terminal decreases depending on the number of multiplexed terminals. The number of multiplexable terminals, i.e., the number of different available OCCs, can be 2 or 4, and the number of OCCs and the applicable OCC index can be set through a higher layer.

[0134] Next, let's explain the short PUCCH. The short PUCCH can be transmitted in both the downlink centric slot and the uplink centric slot, and is typically transmitted in the last symbol of the slot or the OFDM symbol at the end (e.g., the last OFDM symbol, the penultimate OFDM symbol, or the last two OFDM symbols). Of course, the short PUCCH can also be transmitted at any location within the slot. The short PUCCH can be transmitted using one OFDM symbol or two OFDM symbols. The short PUCCH can be used to reduce delay compared to the long PUCCH in situations where uplink cell coverage is good, and can be transmitted using the CP-OFDM scheme.

[0135] Short PUCCH can support transmission formats such as PUCCH format 0 and PUCCH format 2 depending on the number of control information bits that can be supported. First, PUCCH format 0 is a short PUCCH format that can support up to 2 bits of control information and uses frequency resources of 1 RB. Control information can be composed of HARQ-ACK and SR, or a combination thereof. PUCCH format 0 does not transmit DMRS, and is structured to transmit only sequences mapped to 12 subcarriers in the frequency axis within one OFDM symbol. The terminal generates a sequence based on the group hopping or sequence hopping configuration and the configured ID set by the upper signal from the base station, and adds another CS value depending on whether it is ACK or NACK to the indicated initial CS (cyclic shift) value, and cyclically shifts the generated sequence with the final CS value, and maps it to 12 subcarriers for transmission.

[0136] For example, if HARQ-ACK is 1 bit, the terminal can generate the final CS by adding 6 to the initial CS value if it is ACK, as shown in [Table 10] below, and can generate the final CS by adding 0 to the initial CS if it is NACK. The CS value 0 for NACK and the CS value 6 for ACK are defined in the standard, and the terminal can transmit 1-bit HARQ-ACK by generating PUCCH format 0 according to the values ​​defined in the standard.

[0137] [Table 10]

[0138]

[0139] For example, if HARQ-ACK is 2 bits, the terminal adds 0 to the initial CS value if (NACK, NACK), adds 3 to the initial CS value if (NACK, ACK), adds 6 to the initial CS value if (ACK, ACK), and adds 9 to the initial CS value if (ACK, NACK) as shown in [Table 11] below. The CS value 0 for (NACK, NACK), the CS value 3 for (NACK, ACK), the CS value 6 for (ACK, ACK), and the CS value 9 for (ACK, NACK) are defined in the standard, and the terminal can transmit 2-bit HARQ-ACK by generating PUCCH format 0 according to the values ​​defined in the standard. If the final CS value exceeds 12 due to the CS value added to the initial CS value depending on ACK or NACK, modulo 12 can be applied to the final CS value because the length of the sequence is 12.

[0140] [Table 11]

[0141]

[0142] Next, PUCCH format 2 is a short PUCCH format that supports control information exceeding 2 bits, and the number of RBs used can be set through a higher layer. The control information can be composed of a combination of HARQ-ACK, SR, and CSI, or each of them. When the index of the first subcarrier is #0, the location of the subcarrier where the DMRS is transmitted within one OFDM symbol in PUCCH format 2 can be fixed to the subcarriers with indices of #1, #4, #7, and #10. The control information can be mapped to the remaining subcarriers except for the subcarrier where the DMRS is located through a modulation process after channel coding.

[0143] In summary, the values ​​and ranges that can be set for each PUCCH format described above can be summarized as shown in [Table 12] below. In [Table 12] below, values ​​that do not need to be set are indicated as NA.

[0144] [Table 12]

[0145]

[0146] Meanwhile, to improve uplink coverage, multi-slot repetition can be supported for PUCCH formats 1, 3, and 4, and PUCCH repetition can be configured for each PUCCH format. The UE can perform repeated transmissions on PUCCH including UCI as many slots as configured through the higher layer signaling nrofSlots. For repeated PUCCH transmissions, PUCCH transmissions in each slot are performed using the same number of consecutive symbols, and the corresponding number of consecutive symbols can be configured through nrofSymbols in the higher layer signaling PUCCH-format1, PUCCH-format3, or PUCCH-format4. For repeated PUCCH transmissions, PUCCH transmissions in each slot are performed using the same starting symbol, and the corresponding starting symbol can be configured through startingSymbolIndex in the higher layer signaling PUCCH-format 1, PUCCH-format 3, or PUCCH-format 4. For repeated PUCCH transmissions, a single PUCCH-spatialRelationInfo can be configured for a single PUCCH resource. For repeated PUCCH transmissions, if the UE is configured to perform frequency hopping in PUCCH transmissions in different slots, the UE can perform frequency hopping on a slot-by-slot basis. In addition, if the UE is configured to perform frequency hopping in PUCCH transmissions in different slots, the UE can start PUCCH transmission from the first PRB index configured through the higher layer signaling startingPRB in even slots, and start PUCCH transmission from the second PRB index configured through the higher layer signaling secondHopPRB in odd slots.Additionally, if the terminal is configured to perform frequency hopping in PUCCH transmissions in different slots, the index of the slot instructed to perform the first PUCCH transmission to the terminal is 0, and the number of PUCCH repetitions may increase regardless of the PUCCH transmission performed in each slot during the configured total number of PUCCH repetitions. If the terminal is configured to perform frequency hopping in PUCCH transmissions in different slots, the terminal does not expect frequency hopping to be configured within a slot when transmitting PUCCH. If the terminal is not configured to perform frequency hopping in PUCCH transmissions in different slots but is configured to perform frequency hopping within a slot, the first and second PRB indices may be applied equally within the slot. If the number of uplink symbols available for PUCCH transmission is less than nrofSymbols configured by higher layer signaling, the terminal may not transmit the PUCCH. Even if the terminal fails to transmit PUCCH in a slot for some reason during PUCCH repetition transmission, the terminal can increase the number of PUCCH repetition transmissions.

[0147] In NR Release 17, the number of slots to be repeatedly transmitted for each PUCCH resource can be configured through the upper layer signaling pucch-RepetitionNrofSlots-r17 in PUCCH-ResourceExt, which is an extension of PUCCH-Resource, which is the upper layer signaling for PUCCH resources. If the upper layer signaling pucch-RepetitionNrofSlots-r17 is configured, the corresponding PUCCH resource is scheduled, and the upper layer signaling nrofSlots is also configured, the UE determines the number of slots to be repeatedly transmitted for the corresponding PUCCH resource through pucch-RepetitionNrofSlots-r17 and ignores the upper layer signaling nrofSlots.

[0148] [PUCCH: Transmission Power Related]

[0149] In one embodiment of the present disclosure, when uplink control information is transmitted through an uplink control channel (PUCCH) in response to a power control command received from a base station, a method for a terminal to set and transmit the transmission power of an uplink control channel is described. The uplink control channel transmission power (PPUCCH) of the terminal together with the PUCCH power control adjustment state corresponding to the i-th transmission unit and the closed loop index l can be determined as shown in [Mathematical Formula 2] below, which is expressed in units of dBm. In [Mathematical Formula 2] below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined for each primary cell c, carrier frequency f, and bandwidth part b, and can be distinguished by indices b, f, and c.

[0150] [Equation 2]

[0151] ... Mathematical formula (2)

[0152] : The maximum transmission power available to the terminal in the i-th transmission unit is determined by the power class of the terminal, parameters activated from the base station, and various parameters built into the terminal.

[0153] : Is and It can be composed of the sum of . is set via p0-nominal, a Cell Specific upper layer signaling with a cell specific value, and if there is no such setting, can be 0 dBm. is set through p0-PUCCH-Value in upper layer signaling p0-PUCCH in primary cell c, bandwidth part b, carrier frequency f, terminal specific value, is greater than or equal to 0 It may be a smaller value, Is It can mean the size of the set of values ​​and can be set via the upper layer signaling maxNrofPUCCH-P0-PerSet. A set of values ​​can be set via the upper layer signaling p0-Set, or if there is no such set can be considered as

[0154] : Subcarrier spacing configuration value

[0155] : It may mean the amount of resources used in the i-th PUCCH transmission unit within the bandwidth part b, carrier frequency f, and primary cell c (e.g., the number of Resource Blocks (RBs) used for PUCCH transmission on the frequency axis).

[0156] : Pathloss is the path loss between the base station and the terminal, and the terminal uses the reference signal (RS) resource signaled by the base station. Path loss is calculated from the difference between the transmission power and the terminal reception signal level of the reference signal.

[0157] : For PUCCH format 0, if deltaF-PUCCH-f0, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 1, if deltaF-PUCCH-f1, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 2, if deltaF-PUCCH-f2, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 3, if deltaF-PUCCH-f3, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 4, if deltaF-PUCCH-f4, which is an upper layer signaling, is set, the corresponding value is used. For all PUCCH formats, if no upper layer signaling is set, 0 can be used.

[0158] : As a PUCCH transmission power adjustment factor within the bandwidth part b, carrier frequency f, and primary cell c, different calculation methods can be used depending on the PUCCH format.

[0159] : It may mean a PUCCH power control adjustment state value for the i-th PUCCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and primary cell c. Here, the closed loop power adjustment for PUCCH transmission may use an accumulation method that accumulates and applies a value indicated by a TPC command.

[0160] PUCCH power control adjustment status can be determined through the bandwidth part b, carrier frequency f, primary cell c, ith transmission unit, and closed loop index l.

[0161] : A value indicated by a TPC command field included in DCI format 1_0, 1_1 or 1_2 that schedules the i-th PUCCH transmission unit corresponding to the closed loop index l and PDSCH reception within bandwidth part b, carrier frequency f, and primary cell c, or a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUCCH-RNTI.

[0162] If the terminal has received upper layer signaling of twoPUCCH-PC-AdjustmentStates and PUCCH-SpatialRelationInfo, the closed loop index l can have a value of 0 or 1.

[0163] If the terminal does not receive the upper layer signaling twoPUSCH-PC-AdjustmentStates or PUCCH-SpatialRelationInfo, the closed loop index l may have a value of 0.

[0164] If the terminal obtains a TPC command value through a TPC command field included in DCI format 1_0, 1_1, or 1_2 for scheduling PDSCH reception, and if the terminal has been configured with PUCCH-SpatialRelationInfo, which is an upper layer signaling, the terminal can obtain a connection relationship between the pucch-SpatialRelationInfoId value and the closedLoopIndex value that sets the closed loop index l value based on an index that can be configured through p0-PUCCH-Id, which is an upper layer signaling. If the terminal has received a MAC-CE corresponding to pucch-SpatialRelationInfoId, the terminal can determine the closedLoopIndex value that sets the closed loop index l value based on the corresponding p0-PUCCH-Id index.

[0165] If the terminal obtains one TPC command value from the TPC command field included in the DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUCCH-RNTI, it can obtain the l value based on the closed loop index field included in the DCI format 2_2.

[0166] PUCCH power control adjustment state for the i-th PUCCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and primary cell c. can be calculated as in [Mathematical Formula 3].

[0167] [Equation 3]

[0168] ...Mathematical formula (3)

[0169] As described above, the value indicated by the TPC command field included in the DCI format 1_0, 1_1 or 1_2 that schedules the m-th PUCCH transmission unit and PDSCH reception corresponding to the closed loop index l within the bandwidth part b, carrier frequency f and primary cell c, or the value indicated by the TPC command field included in the DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUCCH-RNTI. If the TPC command accumulation operation is possible, The value can have a corresponding value in [dB] units depending on which value the TPC command field included in DCI format 1_0, 1_1, 1_2 or 2_2 is indicated to, as shown in [Table 18]. For example, if the value of the TPC command field is 0, can have a value of -1 dB.

[0170] is a specific set of the TPC command values ​​described above. For all transmission units corresponding to mine can mean the sum of . In this case, c( ) is a set It can mean the number of all elements belonging to me. may mean a set of DCIs including all TPC command values ​​for which a TPC command accumulation operation is to be performed for the i-th PUCCH transmission unit. To determine the starting point and the ending point in the time dimension, all DCIs received by the terminal within the two points are defined. can be included as an element of .

[0171] The end point for decision is from the start symbol of the i-th PUCCH transmission unit. It could be as far back as the symbol.

[0172] The starting point for determining is from the starting symbol of the i - i0th PUCCH transmission unit. It can be a point as far back as the symbol. At this time, i0, which is a positive integer, is The end point for determining (from the start symbol of the i-th PUCCH transmission unit) from the starting symbol of the i - i0th PUCCH transmission unit, The smallest value that satisfies that the time point before the symbol becomes the earlier time point in time can be determined.

[0173] For example, The end point for determining can be defined as sym(i), and from the start symbol of the i - i0th PUCCH transmission unit, If a time point prior to a symbol can be defined as sym(i - i0), then if sym(i) = sym(i -1) > sym(i - 2) > sym(i -3) holds, then i0 can be determined as 2.

[0174] [PUSCH: Transmission method related]

[0175] 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.

[0176] Configured grant Type 1 PUSCH transmission can be semi-statically configured by receiving configuredGrantConfig including rrc-ConfiguredUplinkGrant of [Table 13] 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 13] 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 13], except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by pusch-Config of [Table 14]. If the terminal has been provided with transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 13], the terminal applies tp-pi2BPSK in pusch-Config of [Table 14] to PUSCH transmission operated by the configured grant.

[0177] [Table 13]

[0178]

[0179]

[0180] Next, the PUSCH transmission method is described. The DMRS antenna port for PUSCH transmission is the same as the antenna port for SRS transmission. PUSCH transmission can follow a codebook-based transmission method or a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in the upper signaling, pusch-Config in [Table 14], is 'codebook' or 'nonCodebook'.

[0181] 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 14], the UE does not expect to be scheduled with DCI format 0_1.

[0182] [Table 14]

[0183]

[0184] 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).

[0185] 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.

[0186] 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'.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] [PUSCH: Transmission Power Related]

[0196] In one embodiment of the present disclosure, when uplink data is transmitted through an uplink data channel (PUSCH; Physical Uplink Shared Channel) in response to a power control command received from a base station, a method for transmitting by setting the transmission power of the uplink data channel by a terminal is described. The uplink data channel transmission power of the terminal, together with the i-th transmission unit, the parameter set configuration index j, and the PUSCH power control adjustment state corresponding to the closed loop index l, can be determined as shown in [Mathematical Formula 4] below, which is expressed in units of dBm. In [Mathematical Formula 4] below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be set for each cell c, each carrier frequency f, and each bandwidth part b, and can be distinguished by indices b, f, and c.

[0197] [Equation 4]

[0198] ...Mathematical formula (4)

[0199] : The maximum transmission power available to the terminal in the i-th transmission unit is determined by the power class of the terminal, parameters activated from the base station, and various parameters built into the terminal.

[0200] : Is and It consists of the sum of . is set to cell-specific upper layer signaling to the terminal, is a value set by terminal-specific upper layer signaling. Here, when j=0, it means PUSCH for transmitting msg3, when j=1, it means configured grant PUSCH, and when j={2, ..., J-1} is one of the values, it means grant PUSCH.

[0201] : Subcarrier spacing configuration value

[0202] : It may mean the amount of resources used in the i-th PUSCH transmission unit (e.g., the number of Resource Blocks (RBs) used for PUSCH transmission in the frequency axis).

[0203] This refers to a value that can be determined (in the case of dynamic grant PUSCH) through upper layer settings and SRI (SRS Resource Indicator) as a value to compensate for path loss.

[0204] : Pathloss is the path loss between the base station and the terminal, and the terminal uses the reference signal (RS) resource signaled by the base station. The path loss is calculated from the difference between the transmission power and the terminal reception signal level of the reference signal. The reference signal index is It refers to the downlink path loss estimate estimated by the terminal through the reference signal and the reference signal index. 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.

[0205] : It refers to a value determined according to the MCS (Modulation Coding Scheme) and the format of information transmitted via PUSCH (TF: transport format, e.g., whether UL-SCH is included or CSI is included, etc.).

[0206] : Refers to a value for the closed loop index l that can be determined by the upper layer setting and SRI for PUSCH as a closed loop power control adjustment value. Here, the closed loop power adjustment for PUSCH transmission can be supported by dividing into an accumulation method that accumulates and applies a value indicated by a TPC command and an absolute method that directly applies the value indicated by the TPC command, and this can be determined depending on whether the upper layer parameter tpc-Accumulation is set. If the upper layer parameter tpc-Accumulation is set to disabled, the closed loop power adjustment for PUSCH transmission is performed by the absolute method, and if tpc-Accumulation is not set, the closed loop power adjustment for PUSCH transmission is performed by the accumulation method.

[0207] PUSCH power control adjustment status can be determined through the bandwidth part b, carrier frequency f, cell c, i-th transmission unit, and closed loop index l.

[0208] : A value indicated by a TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c, or a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI.

[0209] If the terminal has received the upper layer signaling twoPUSCH-PC-AdjustmentStates, the closed loop index l can have a value of 0 or 1.

[0210] If the terminal has not received the upper layer signaling twoPUSCH-PC-AdjustmentStates or has been scheduled for PUSCH transmission based on RAR UL grant, the closed loop index l may have a value of 0.

[0211] If the terminal has set ConfiguredGrantConfig, which is a higher layer signaling, and performs PUSCH transmission or retransmission for it, the closed loop index l may follow the powerControlLoopToUse value, which is a higher layer signaling.

[0212] If the terminal has been configured with SRI-PUSCH-PowerControl, which is a higher layer signaling, the terminal can obtain a connection relationship between a value indicated by the SRI (SRS resource indicator) field in the DCI format that schedules PUSCH transmission and a closed loop index l configured through sri-PUSCH-ClosedLoopIndex, which is a higher layer signaling, and can determine the closed loop index l based on the value indicated by the SRI field in the DCI format based on the corresponding connection relationship.

[0213] If the terminal is scheduled for PUSCH transmission based on a DCI format that does not include the SRI field, or if the upper layer signaling SRI-PUSCH-PowerControl is not configured, the terminal may regard the closed loop index l as 0.

[0214] If the terminal is indicated with a TPC command value through a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI, the closed loop index l can be indicated through the closed loop index field included in DCI format 2_2.

[0215] If the terminal has not been configured with the upper layer signaling tpc-Accumulation, i.e., if the TPC command accumulation operation is possible for the terminal, the PUSCH power control adjustment state for the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c. can be calculated as in [Mathematical Formula 5].

[0216] [Equation 5]

[0217] ...Mathematical formula (5)

[0218] As described above, the TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the m-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c may be a value indicated by the TPC command field included in DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUSCH-RNTI. If the TPC command accumulation operation is possible, The value may have a corresponding value in [dB] units depending on which value the TPC command field included in the DCI format 0_0, 0_1, 0_2, or 2_2 is indicated as in [Table 18] below. For example, if the value of the TPC command field is 0, can have a value of -1 dB.

[0219] is a specific set of the TPC command values ​​described above. For all transmission units corresponding to mine can mean the sum of . In this case, c( ) is a set It can mean the number of all elements belonging to me. may mean a set of DCIs including all TPC command values ​​for which a TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. To determine the starting point and the ending point in the time dimension, all DCIs received by the terminal within the two points are defined. can be included as an element of .

[0220] The end point for determining is from the start symbol of the i-th PUSCH transmission unit. It could be as far back as the symbol.

[0221] The starting point for deciding is From the start symbol of the th PUSCH transmission unit It can be a point as far back as the symbol. In this case, a positive integer is above The end point for determining (from the start symbol of the i-th PUSCH transmission unit) (as much as the previous point) than the symbol, From the start symbol of the th PUSCH transmission unit It can be determined as the smallest value that satisfies that the previous time point becomes an earlier time point in time by a symbol.

[0222] For example, The end point for determining can be defined as sym(i), From the start symbol of the th PUSCH transmission unit The time point before the symbol is sym( ), if sym(i) = sym(i -1) > sym(i - 2) > sym(i -3) holds, then i0 can be determined as 2.

[0223] If the terminal has been set to the upper layer signaling tpc-Accumulation, i.e., if the TPC command accumulation operation is not possible for the terminal, the PUSCH power control adjustment state for the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c. can be calculated as in [Mathematical Formula 6].

[0224] [Equation 6]

[0225] ...Mathematical formula (6)

[0226] As described above, the TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c may be a value indicated by the TPC command field included in DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUSCH-RNTI. If the TPC command accumulation operation is impossible, The value may have a corresponding value in [dB] units depending on which value the TPC command field included in the DCI format 0_0, 0_1, 0_2, or 2_2 is indicated as in [Table 15] below. For example, if the value of the TPC command field is 0, can have a value of -4 dB.

[0227] [Table 15]

[0228]

[0229] [SRS related]

[0230] Next, we describe an uplink channel estimation method using the Sounding Reference Signal (SRS) transmission of a terminal. The base station can configure at least one SRS configuration for each uplink BWP to convey configuration information for SRS transmission to the terminal, and can also configure at least one SRS resource set for each SRS configuration. For example, the base station and the terminal can exchange the following upper-level signaling information to convey information regarding the SRS resource set.

[0231] - srs-ResourceSetId: SRS resource set index

[0232] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0233] - resourceType: This is the time axis transmission setting of the SRS resource referenced in the SRS resource set, and can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. If set to 'periodic' or 'semi-persistent', associated CSI-RS information can be provided depending on the usage of the SRS resource set. If set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information can be provided, and associated CSI-RS information can be provided depending on the usage of the SRS resource set.

[0234] - usage: This is a setting for the usage of the SRS resource referenced in the SRS resource set, and can be set to one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

[0235] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0236] The terminal can understand that the SRS resource included in the set of SRS resource indices referenced in the SRS resource set follows the information set in the SRS resource set.

[0237] In addition, the base station and the terminal can transmit and receive upper layer signaling information to convey individual configuration information for the SRS resource. For example, the individual configuration information for the SRS resource can include time-frequency axis mapping information within the slot of the SRS resource, which can include information about frequency hopping within the slot or between slots of the SRS resource. In addition, the individual configuration information for the SRS resource can include the time axis transmission configuration of the SRS resource, which can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This can be restricted to have the same time axis transmission configuration as the SRS resource set including the SRS resource. If the time axis transmission configuration of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (e.g., periodicityAndOffset) can additionally be included in the time axis transmission configuration.

[0238] The base station can activate, deactivate, or trigger SRS transmission to the UE through higher layer signaling, including RRC signaling or MAC CE signaling, or L1 signaling (e.g., DCI). For example, the base station can activate or deactivate periodic SRS transmission to the UE through higher layer signaling. The base station can instruct the UE to activate an SRS resource set with resourceType set to periodic through higher layer signaling, and the UE can transmit the SRS resource referenced in the activated SRS resource set. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource, and the slot mapping, including the transmission period and slot offset, follows the periodicityAndOffset set in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information set in the SRS resource, or the associated CSI-RS information set in the SRS resource set that includes the SRS resource. A terminal can transmit SRS resources within an activated uplink BWP for periodic SRS resources activated through upper layer signaling.

[0239] For example, a base station can activate or deactivate semi-persistent SRS transmission to a terminal through upper layer signaling. The base station can instruct the terminal to activate an SRS resource set through MAC CE signaling, and the terminal can transmit an SRS resource referenced in the activated SRS resource set. The SRS resource set activated through MAC CE signaling can be limited to an SRS resource set with resourceType set to semi-persistent. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource, and the slot mapping including the transmission period and slot offset follows the periodicityAndOffset configured in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or the associated CSI-RS information configured in the SRS resource set that includes the SRS resource. If spatial relation info is configured in an SRS resource, the spatial domain transmission filter can be determined by referring to the configuration information for spatial relation info transmitted through MAC CE signaling that activates semi-persistent SRS transmission without following it. The terminal can transmit SRS resources within the activated uplink BWP for the semi-persistent SRS resource activated through upper layer signaling.

[0240] For example, a base station can trigger aperiodic SRS transmission to a terminal via DCI. The base station can indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) via the SRS request field of the DCI. The terminal can understand that an SRS resource set including the aperiodic SRS resource trigger indicated via DCI in the aperiodic SRS resource trigger list among the configuration information of the SRS resource set has been triggered. The terminal can transmit an SRS resource referenced in the triggered SRS resource set. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource. In addition, the slot mapping of the transmitted SRS resource can be determined through a slot offset between a PDCCH including the DCI and the SRS resource, which can refer to value(s) included in a slot offset set configured in the SRS resource set. Specifically, the slot offset between the PDCCH including DCI and the SRS resource can be applied by applying the value indicated in the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set configured in the SRS resource set. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or can refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The UE can transmit the SRS resource within the activated uplink BWP for the aperiodic SRS resource triggered through the DCI.

[0241] When a base station triggers aperiodic SRS transmission to a terminal through DCI, a minimum time interval may be required between a PDCCH including the DCI that triggers aperiodic SRS transmission and the SRS to be transmitted, so that the terminal can transmit the SRS by applying configuration information for the SRS resource. The time interval for SRS transmission of the terminal can be defined as the number of symbols between the last symbol of the PDCCH including the DCI that triggers aperiodic SRS transmission and the first symbol to which the first SRS resource to be transmitted among the SRS resource(s) is mapped. The minimum time interval can be determined with reference to the PUSCH preparation procedure time required for the terminal to prepare for PUSCH transmission. In addition, the minimum time interval can have different values ​​depending on the usage of the SRS resource set including the SRS resource to be transmitted. For example, the minimum time interval can be determined as N2 symbols, which are defined by considering the terminal processing ability according to the capability of the terminal with reference to the PUSCH preparation procedure time of the terminal. In addition, considering the usage of the SRS resource set including the SRS resource being transmitted, if the usage of the SRS resource set is set to 'codebook' or 'antennaSwitching', the minimum time interval can be set to N2 symbols, and if the usage of the SRS resource set is set to 'nonCodebook' or 'beamManagement', the minimum time interval can be set to N2+14 symbols.The terminal may transmit an aperiodic SRS if the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and may ignore the DCI that triggers the aperiodic SRS if the time interval for aperiodic SRS transmission is less than the minimum time interval.

[0242] [Table 16]

[0243]

[0244] The spatialRelationInfo setting information in [Table 16] above refers to a single reference signal and applies the beam information of the reference signal to the beam used for the corresponding SRS transmission. For example, the spatialRelationInfo setting may include information such as [Table 17] below.

[0245] [Table 17]

[0246]

[0247] Referring to the above spatialRelationInfo setting, in order to use the beam information of a specific reference signal, the index of the reference signal to be referenced, i.e., the SS / PBCH (synchronization signal / physical broadcast channel) block (or SSB, synchronization signal block) index, CSI-RS index, or SRS index can be set. The upper signaling referenceSignal is setting information indicating which beam information of which reference signal is to be referenced for the corresponding SRS transmission, and ssb-Index means the index of the SS / PBCH block, csi-RS-Index means the index of the CSI-RS, and srs means the index of the SRS, respectively. If the value of the upper signaling referenceSignal is set to 'ssb-Index', the terminal can apply the reception beam used when receiving the SS / PBCH block corresponding to ssb-Index as the transmission beam of the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the terminal can apply the reception beam used when receiving the CSI-RS corresponding to the csi-RS-Index as the transmission beam for the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'srs', the terminal can apply the transmission beam used when transmitting the SRS corresponding to the srs as the transmission beam for the corresponding SRS transmission.

[0248] [SRS Transmission Power Related]

[0249] In one embodiment of the present disclosure, a method for transmitting an uplink reference signal (SRS) by setting the transmission power of the uplink reference signal by a terminal in response to a power control command received from a base station is described. The uplink reference signal transmission power (PSRS) of the terminal together with the SRS power control adjustment state corresponding to the i-th transmission unit and the closed loop index l can be determined as shown in [Mathematical Formula 7] below, which is expressed in units of dBm. In [Mathematical Formula 7] below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined for each cell c, each carrier frequency f, and each bandwidth part b, and can be distinguished by indices b, f, and c.

[0250] [Equation 7]

[0251] ...Mathematical formula (7)

[0252] : The maximum transmission power available to the terminal in the i-th transmission unit is determined by the power class of the terminal, parameters activated from the base station, and various parameters built into the terminal.

[0253] : For bandwidth part b, carrier frequency f, and cell c, the upper layer signaling can be set to p0, and the SRS resource set can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0254] : Subcarrier spacing configuration value

[0255] : It may mean the amount of resources used in the i-th SRS transmission unit (e.g., the number of Resource Blocks (RBs) used for SRS transmission on the frequency axis).

[0256] : For bandwidth part b, carrier frequency f, and cell c, it can be set to alpha, which is the upper layer signaling, and SRS resource set can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0257] : Pathloss is the path loss between the base station and the terminal, and the terminal uses the reference signal (RS) resource signaled by the base station. Path loss is calculated from the difference between the transmission power and the terminal reception signal level of the reference signal.

[0258] : It may mean an SRS power control adjustment state value for the i-th SRS transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c.

[0259] The SRS power control adjustment state can be determined through the bandwidth part b, carrier frequency f, cell c, and i-th transmission unit.

[0260] If the terminal is configured to have the same power control adjustment state value between SRS transmission and PUSCH transmission through the upper layer signaling srs-PowerControlAdjustmentStates, the SRS power control adjustment state can be expressed as in [Mathematical Formula 8] below, and in [Mathematical Formula 8] may mean the current PUSCH power control adjustment state. In this case, through various methods of the above-described embodiment 1, can be calculated and its value It can be used by substituting it into .

[0261] [Equation 8]

[0262] ...Mathematical formula (8)

[0263] If the terminal is not configured for PUSCH transmission in bandwidth part b, carrier frequency f, and cell c, or is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission through upper layer signaling srs-PowerControlAdjustmentStates, and upper layer signaling tpc-Accumulation is not configured, the SRS power control adjustment state can be expressed regardless of the closed loop l as in [Mathematical Formula 9] below.

[0264] [Equation 9]

[0265] ...Mathematical formula (9)

[0266] : It may be a value indicated by the TPC command field included in DCI format 2_3, and the value may follow [Table 14] above.

[0267] is a specific set of the TPC command values ​​described above. For all transmission units corresponding to mine can mean the sum of . In this case, c( ) is a set It can mean the number of all elements belonging to me. may mean a set of DCIs including all TPC command values ​​for which a TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. To determine the starting point and the ending point in the time dimension, all DCIs received by the terminal within the two points are defined. can be included as an element of .

[0268] The end point for determining is from the start symbol of the i-th SRS transmission unit. It could be as far back as the symbol.

[0269] The starting point for determining is from the starting symbol of the i - i0th SRS transmission unit. It can be a point as far back as the symbol. At this time, i0, which is a positive integer, is The end point for determining (from the start symbol of the i-th SRS transmission unit) from the starting symbol of the i - i0th SRS transmission unit, i) from the point before the symbol It can be determined as the smallest value that satisfies that the previous time point becomes an earlier time point in time by a symbol.

[0270] For example, The end point for determining can be defined as sym(i), and from the start symbol of the i - i0th SRS transmission unit, If a time point prior to a symbol can be defined as sym(i - i0), then if sym(i) = sym(i -1) > sym(i - 2) > sym(i -3) holds, then i0 can be determined as 2.

[0271] If the terminal is not configured for PUSCH transmission in bandwidth part b, carrier frequency f, and cell c, or is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission through upper layer signaling srs-PowerControlAdjustmentStates, and upper layer signaling tpc-Accumulation is configured (i.e., TPC command accumulation operation cannot be performed and absolute TPC command value can be applied), the SRS power control adjustment state can be expressed regardless of closed loop l as in [Mathematical Formula 10] below.

[0272] [Equation 10]

[0273] ...Mathematical formula (10)

[0274] As described above, it may be a value indicated by the TPC command field included in the DCI format 2_3 within the bandwidth part b, carrier frequency f, and cell c, and the value may follow the above [Table 15]. For example, if the value of the TPC command field is 0, can have a value of -4 dB.

[0275] [Regarding terminal capability reporting]

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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."

[0282] 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 in the order of the preset rat-Type (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.

[0283] 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.

[0284] 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.

[0285] [NC-JT related]

[0286] 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.

[0287] 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.

[0288] 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.

[0289] 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, and / or 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.

[0290] FIG. 4 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.

[0291] Referring to FIG. 4, examples for PDSCH transmission are explained for each technique of joint transmission (JT), and examples for allocating radio resources for each TRP are shown.

[0292] Referring to FIG. 4, an example (400) for coherent joint transmission (C-JT) supporting coherent precoding between each cell, TRP or / and beam is illustrated.

[0293] In the case of C-JT, TRP A (405) and TRP B (410) transmit a single data (PDSCH) to the terminal (415), and joint precoding can be performed on multiple TRPs. This may mean that DMRS is transmitted through the same DMRS ports for TRP A (405) and TRP B (410) to transmit the same PDSCH. For example, TRP A (405) and TRP B (410) 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.

[0294] FIG. 4 illustrates an example (420) of Non-Coherent Joint Transmission (NC-JT) supporting non-coherent precoding between each cell, TRP, or / and beam for PDSCH transmission.

[0295] In the case of NC-JT, PDSCH is transmitted to the terminal (435) 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.

[0296] 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 (440), when the frequency and time resources used by multiple TRPs do not overlap at all (445), and when some of the frequency and time resources used by multiple TRPs overlap (450).

[0297] To support NC-JT, DCIs of various forms, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to a single terminal.

[0298] FIG. 5 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.

[0299] Referring to FIG. 5, case #1 (500) 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.

[0300] Case #2 (505) 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.

[0301] 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.

[0302] 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.

[0303] Case #3 (510) 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.

[0304] 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.

[0305] Case #3 (510) may have a limited degree of 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 (500) or case #2 (505).

[0306] Case #4 (515) 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 (1115), 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.

[0307] 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.

[0308] In the following description and examples, the aforementioned cases #1 (500), #2 (505), and #3 (510), 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 (515), 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.

[0309] 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.

[0310] 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.

[0311] The wireless protocol architecture for NC-JT in this disclosure can be used in various ways depending on the TRP deployment scenario. For example, when the backhaul delay between cooperating TRPs is small or non-existent, a method using a structure based on MAC layer multiplexing (CA-like method) is possible. On the other hand, when the backhaul delay between cooperating TRPs is large enough to be negligible (e.g., when the exchange of information such as CSI, scheduling, and HARQ-ACK between cooperating TRPs requires more than 2 ms), a method using an independent structure for each TRP starting from the RLC layer to ensure delay-robustness is possible (DC-like method).

[0312] 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 up to 8 states can be set among the set number, which 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.

[0313] [Multi-DCI based Multi-TRP]

[0314] As one embodiment of the present disclosure, a multi-DCI-based multi-TRP transmission method is described. The multi-DCI-based multi-TRP transmission method can establish a downlink control channel for NC-JT transmission based on a multi-PDCCH.

[0315] In NC-JT based on multiple PDCCHs, when transmitting DCI for the PDSCH schedule of each TRP, a CORESET or search space can be distinguished for each TRP. The CORESET or search space for each TRP can be configured as in at least one of the following cases.

[0316] * Setting of upper layer index for each CORESET: The CORESET setting information set as an upper layer may include an index value, and the TRP transmitting the PDCCH in the corresponding CORESET may be distinguished by the set index value for each CORESET. That is, in a set of CORESETs with the same upper layer index value, it may be considered that the same TRP transmits the PDCCH, or it may be considered that a PDCCH scheduling the PDSCH of the same TRP is transmitted. The above-described index for each CORESET may be named as CORESETPoolIndex, and for CORESETs with the same CORESETPoolIndex value set, it may be considered that the PDCCH is transmitted from the same TRP. For a CORESET for which the CORESETPoolIndex value is not set, it may be considered that the default value of CORESETPoolIndex is set, and the above-described default value may be 0.

[0317] ** In the present disclosure, if the number of types of CORESETPoolIndex of each of the multiple CORESETs included in the upper layer signaling PDCCH-Config exceeds 1, i.e., if each CORESET has a different CORESETPoolIndex, the terminal may consider that the base station can use the multi-DCI based multi-TRP transmission method.

[0318] ** Differently, in the present disclosure, if each of the multiple CORESETs included in the upper layer signaling PDCCH-Config has only one type of CORESETPoolIndex, that is, if all CORESETs have the same CORESETPoolIndex of 0 or 1, the terminal can assume that the base station transmits using a single-TRP rather than using a multi-DCI based multi-TRP transmission method.

[0319] * Multiple PDCCH-Config settings: Multiple PDCCH-Configs are configured within one BWP, and each PDCCH-Config can include PDCCH settings for each TRP. That is, a list of CORESETs for each TRP and / or a list of search spaces for each TRP can be configured in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config can be considered to correspond to a specific TRP.

[0320] * CORESET Beam / Beam Group Configuration: The TRP corresponding to the CORESET can be distinguished through the beam or beam group configured for each CORESET. For example, if the same TCI state is set for multiple CORESETs, the CORESETs can be considered to be transmitted through the same TRP, or the PDCCH that schedules the PDSCH of the same TRP can be considered to be transmitted in the CORESET.

[0321] * Search space beam / beam group configuration: A beam or beam group is configured for each search space, and this allows TRPs for each search space to be distinguished. For example, if the same beam / beam group or TCI state is set for multiple search spaces, it can be considered that the same TRP transmits a PDCCH in the corresponding search space, or that a PDCCH that schedules the PDSCH of the same TRP is transmitted in the corresponding search space.

[0322] By dividing the CORESET or search space by TRP as described above, PDSCH and HARQ-ACK information classification for each TRP is possible, and this enables independent HARQ-ACK codebook generation and independent PUCCH resource use for each TRP.

[0323] The above settings can be independent on a per-cell or per-BWP basis. For example, a PCell may have two different CORESETPoolIndex values ​​configured, while a specific SCell may not have a CORESETPoolIndex value configured. In this case, it can be assumed that NC-JT transmission is configured on the PCell, while NC-JT transmission is not configured on the SCell without the CORESETPoolIndex value configured.

[0324] The PDSCH TCI state activation / deactivation MAC-CE applicable to the multi-DCI based multi-TRP transmission method can follow the above-mentioned FIG. 3. If the UE does not have CORESETPoolIndex set for each of all CORESETs in the upper layer signaling PDCCH-Config, the UE can ignore the CORESET Pool ID field (355) in the corresponding MAC-CE (350). If the UE can support the multi-DCI based multi-TRP transmission method, i.e., if each CORESET in the upper layer signaling PDCCH-Config of the UE has a different CORESETPoolIndex, the UE can activate the TCI state in the DCI included in the PDCCH transmitted in the CORESETs having the same CORESETPoolIndex value as the CORESET Pool ID field (355) value in the corresponding MAC-CE (350). For example, if the value of the CORESET Pool ID field (355) within the MAC-CE (350) is 0, the TCI state within the DCI included in the PDCCH transmitted from CORESETs having CORESETPoolIndex of 0 may follow the activation information of the MAC-CE.

[0325] When a terminal is configured to use a multi-DCI based multi-TRP transmission method from a base station, that is, when each of multiple CORESETs included in the upper layer signaling PDCCH-Config has more than one type of CORESETPoolIndex or when each CORESET has a different CORESETPoolIndex, the terminal can know that the following restrictions exist for PDSCHs scheduled from PDCCHs within each CORESET having two different CORESETPoolIndexes.

[0326] 1) If the PDSCHs indicated by the PDCCHs within each CORESET having two different CORESETPoolIndexes completely or partially overlap, the TCI states indicated by each PDCCH can be applied to different CDM groups. That is, two or more TCI states may not be applied to a single CDM group.

[0327] 2) The terminal can expect that the actual number of front-loaded DMRS symbols, the actual number of additional DMRS symbols, the location of actual DMRS symbols, and the DMRS type of each PDSCH will not be different when the PDSCHs indicated from the PDCCHs within each CORESET having two different CORESETPoolIndexes overlap completely or partially.

[0328] 3) The terminal can expect that the bandwidth portion indicated by the PDCCH within each CORESET having two different CORESETPoolIndexes will be the same and that the subcarrier spacing will also be the same.

[0329] 4) The terminal can expect that each PDCCH will fully contain information about the PDSCH scheduled from the PDCCH within each CORESET having two different CORESETPoolIndexes.

[0330] [Single-DCI based Multi-TRP]

[0331] As one embodiment of the present disclosure, a single-DCI-based multi-TRP transmission method is described. The single-DCI-based multi-TRP transmission method can establish a downlink control channel for NC-JT transmission based on a single-PDCCH.

[0332] In a single DCI-based multi-TRP transmission method, a PDSCH transmitted by multiple TRPs can be scheduled with a single DCI. At this time, the number of TCI states can be used as a method of indicating the number of TRPs transmitting the corresponding PDSCH. That is, if the number of TCI states indicated in the DCI scheduling the PDSCH is two, it can be considered as a single PDCCH-based NC-JT transmission, and if the number of TCI states is one, it can be considered as a single-TRP transmission. The TCI states indicated in the above DCI can correspond to one or both of the TCI states activated by MAC-CE. When the TCI states of the DCI correspond to two TCI states activated by MAC-CE, a correspondence relationship is established between the TCI codepoint indicated in the DCI and the TCI states activated by MAC-CE, and this can be the case when there are two TCI states activated by MAC-CE corresponding to the above TCI codepoint.

[0333] As another example, if at least one codepoint among all codepoints in the TCI state field within the DCI indicates two TCI states, the UE may assume that the base station can transmit based on the single-DCI based multi-TRP method. In this case, at least one codepoint indicating two TCI states within the TCI state field may be activated via the Enhanced PDSCH TCI state activation / deactivation MAC-CE.

[0334] Figure 6 is a diagram illustrating the structure of the Enhanced PDSCH TCI state activation / deactivation MAC-CE. The meaning of each field within the MAC CE and the values ​​that can be set for each field are as shown in [Table 18] below.

[0335] [Table 18]

[0336]

[0337] In Fig. 6, if the value of the C0 field (605) is 1, the MAC-CE may include a TCI state ID0,2 field (615) in addition to the TCI state ID0,1 field (610). This means that TCI state ID0,1 and TCI state ID0,2 are activated for the 0th codepoint of the TCI state field included in the DCI, and if the base station indicates the codepoint to the terminal, the terminal may be indicated with two TCI states. If the value of the C0 field (605) is 0, the MAC-CE cannot include the TCI state ID0,2 field (615), and this means that one TCI state corresponding to TCI state ID0,1 is activated for the 0th codepoint of the TCI state field included in the DCI.

[0338] The above configuration can be independent on a per-cell or per-BWP basis. For example, a PCell may have up to two activated TCI states corresponding to a single TCI codepoint, while a specific SCell may have up to one activated TCI state corresponding to a single TCI codepoint. In this case, it can be assumed that NC-JT transmission is configured on the PCell, while NC-JT transmission is not configured on the aforementioned SCell.

[0339] [Distinguishing between Single-DCI-based Multi-TRP PDSCH Repetitive Transmission Techniques (TDM / FDM / SDM)]

[0340] Next, we describe a method for distinguishing between single-DCI-based multi-TRP PDSCH repetition transmission techniques. A UE may be instructed to use different single-DCI-based multi-TRP PDSCH repetition transmission techniques (e.g., TDM, FDM, SDM) based on values ​​indicated by DCI fields from a base station and higher-layer signaling configurations. Table 19 below illustrates a method for distinguishing between single- and multiple-TRP-based techniques indicated to a UE based on values ​​of specific DCI fields and higher-layer signaling configurations.

[0341] [Table 19]

[0342]

[0343] In the above [Table 19], each column can be explained as follows.

[0344] - Number of TCI states (2 columns): This refers to the number of TCI states indicated by the TCI state field in DCI, and can be 1 or 2.

[0345] - Number of CDM Groups (column 3): This indicates the number of different CDM groups of DMRS ports indicated by the Antenna port field in the DCI. It can be 1, 2, or 3.

[0346] - repetitionNumber setting and indication conditions (column 4): There are three conditions depending on whether repetitionNumber is set for all TDRA entries that can be indicated by the Time Domain Resource Allocation field in DCI and whether the actually indicated TDRA entry has repetitionNumber setting.

[0347] * Condition 1: At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field contains a setting for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI contains a setting for repetitionNumber greater than 1.

[0348] * Condition 2: At least one of all TDRA entries that can be indicated by the Time Domain Resource Allocation field contains a setting for repetitionNumber, and the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI does not contain a setting for repetitionNumber.

[0349] * Condition 3: If all TDRA entries that can be indicated by the Time Domain Resource Allocation field do not contain a setting for repetitionNumber.

[0350] - RepetitionScheme setting related (column 5): This indicates whether the upper layer signaling repetitionScheme is set. The upper layer signaling repetitionScheme can be set to one of 'tdmSchemeA', 'fdmSchemeA', or 'fdmSchemeB'.

[0351] - Transmission technique indicated to the terminal (column 6): Refers to single or multiple TRP techniques indicated according to each combination (column 1) expressed in [Table 19] above.

[0352] * Single-TRP: This refers to a single TRP-based PDSCH transmission. If the UE has configured the pdsch-AggegationFactor in the upper layer signaling PDSCH-config, the UE can be scheduled for the configured number of repeated single-TRP-based PDSCH transmissions. Otherwise, the UE can be scheduled for a single single-TRP-based PDSCH transmission.

[0353] * Single-TRP TDM scheme B: This refers to PDSCH repeated transmission based on time resource division between single TRP slots. According to Condition 1 related to repetitionNumber described above, the UE repeatedly transmits PDSCH in the time dimension for the number of slots with repetitionNumber that is greater than 1 set in the TDRA entry indicated by the Time Domain Resource Allocation field. At this time, for each slot equal to the repetitionNumber number, the start symbol and symbol length of the PDSCH indicated by the TDRA entry are applied identically, and the same TCI state is applied for each PDSCH repeated transmission. This technique is similar to the slot aggregation method in that it performs PDSCH repeated transmission between slots on time resources, but it differs from slot aggregation in that it can dynamically determine whether to indicate repeated transmission based on the Time Domain Resource Allocation field in the DCI.

[0354] * Multi-TRP SDM: This refers to a PDSCH transmission method based on spatial resource division based on multiple TRPs. This is a method of receiving by dividing layers from each TRP. Although it is not a repetitive transmission method, it can increase the reliability of PDSCH transmission by increasing the number of layers and lowering the coding rate. The terminal can receive PDSCH by applying the two TCI states indicated through the TCI state field in the DCI for each of the two CDM groups indicated by the base station.

[0355] * Multi-TRP FDM scheme A: This refers to a multi-TRP based frequency resource division PDSCH transmission method. It has one PDSCH transmission position (occasion), so it is not repetitive transmission like multi-TRP SDM, but it is a technique that can transmit with high reliability by increasing the frequency resource amount and lowering the coding rate. Multi-TRP FDM scheme A can apply two TCI states indicated through the TCI state field in the DCI for non-overlapping frequency resources. If the PRB bundling size is determined as wideband, if the number of RBs indicated by the Frequency Domain Resource Allocation field is N, the terminal applies the first TCI state to the first ceil(N / 2) RBs and applies the second TCI state to the remaining floor(N / 2) RBs. Here, ceil(.) and floor(.) are operators that indicate rounding up and down to the first decimal place. If the PRB bundling size is determined as 2 or 4, even-numbered PRGs receive the first TCI state, and odd-numbered PRGs receive the second TCI state.

[0356] * Multi-TRP FDM scheme B: This refers to a multi-TRP based frequency resource division PDSCH repeated transmission method, and it has two PDSCH transmission positions (occasions) so that PDSCH can be repeatedly transmitted in each position. Multi-TRP FDM scheme B, like A, can apply two TCI states indicated through the TCI state field in the DCI to non-overlapping frequency resources. If the PRB bundling size is determined as wideband, if the number of RBs indicated by the Frequency Domain Resource Allocation field is N, the UE applies the first TCI state to the first ceil (N / 2) RBs and applies the second TCI state to the remaining floor (N / 2) RBs and receives them. Here, ceil (.) and floor (.) are operators indicating round up and down to the first decimal place. If the PRB bundling size is determined as 2 or 4, even-numbered PRGs receive the first TCI state, and odd-numbered PRGs receive the second TCI state.

[0357] * Multi-TRP TDM scheme A: This refers to a PDSCH repeated transmission method within a multi-TRP based time resource division slot. A terminal has two PDSCH transmission positions (occasions) within one slot, and the first reception position can be determined based on the starting symbol and symbol length of the PDSCH indicated through the Time Domain Resource Allocation field in the DCI. The starting symbol of the second reception position of the PDSCH can be a position that applies a symbol offset by the upper layer signaling StartingSymbolOffsetK from the last symbol of the first transmission position, and the transmission position can be determined by the indicated symbol length. If the upper layer signaling StartingSymbolOffsetK is not set, the symbol offset can be regarded as 0.

[0358] * Multi-TRP TDM scheme B: This refers to a PDSCH repeated transmission method between time resource division slots based on multiple TRPs. The UE has one PDSCH transmission position (occasion) in one slot, and can receive repeated transmissions based on the start symbol and symbol length of the same PDSCH for the number of slots indicated by the repetitionNumber through the Time Domain Resource Allocation field in the DCI. If the repetitionNumber is 2, the UE can receive the PDSCH repeated transmissions of the first and second slots by applying the first and second TCI states, respectively. If the repetitionNumber is greater than 2, the UE can use different TCI state application methods depending on how the upper layer signaling tciMapping is set. If tciMapping is set to cyclicMapping, the first and second TCI states are applied to the first and second PDSCH transmission positions, respectively, and the same TCI state application method is applied to the remaining PDSCH transmission positions. If tciMapping is set to sequentialMapping, the first TCI state is applied to the first and second PDSCH transmission positions, the second TCI state is applied to the third and fourth PDSCH transmission positions, and the same TCI state application method is applied to the remaining PDSCH transmission positions.

[0359] For convenience in the following description of the present disclosure, cells, transmission points, panels, beams, and / or transmission directions, which can be distinguished through upper layer / L1 parameters such as TCI state or spatial relation information, or indicators such as cell ID, TRP ID, and panel ID, may be uniformly described as TRP (transmission reception point), beam, or TCI state. Therefore, in actual application, TRP, beam, or TCI state can be appropriately replaced with one of the above terms.

[0360] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied have a specific format, or including a specific indicator that indicates whether cooperative communication is applied, or scrambled with a specific RNTI by the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or assuming cooperative communication is applied in a specific section indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

[0361] 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 a similar technical background or channel type. 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, and / or XDD (and / or SBFD, full duplex) systems.

[0362] 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.

[0363] 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.

[0364] MIB (Master Information Block)

[0365] SIB (System Information Block) or SIB

[0366] RRC (Radio Resource Control)

[0367] MAC (Medium Access Control) CE (Control Element)

[0368] In addition, L1 (layer 1) 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.

[0369] PDCCH (Physical Downlink Control Channel)

[0370] DCI (Downlink Control Information)

[0371] UE-specific DCI

[0372] Group common DCI

[0373] Common DCI

[0374] Scheduling DCI (e.g., DCI used for scheduling downlink or uplink data)

[0375] Non-scheduled DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0376] PUCCH (Physical Uplink Control Channel)

[0377] UCI (Uplink Control Information)

[0378] 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.

[0379] 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.

[0380] 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.

[0381] In the description of one embodiment of the present disclosure, "more than" may be replaced with "more than," and "less than" may be replaced with "less than." In the description of one embodiment of the present disclosure, "more than" may be replaced with "more than," and "less than" may be replaced with "less than."

[0382] <Example 1: UL-only TRP support method>

[0383] As one embodiment of the present disclosure, a method for supporting UL-only TRP, which only allows UL reception among multi-TRPs, is described. This embodiment can be operated in combination with other embodiments.

[0384] When transmitting an uplink channel, the terminal can determine the uplink transmission power based on the TCI state. At this time, depending on the supported TCI state, the terminal and base station can operate in either the joint TCI mode (indicating the uplink transmission power parameter using the TCI-State) or the separate TCI mode (indicating the uplink transmission power parameter using the TCI-UL-State). The transmission power parameter can be applied to the uplink channel to be transmitted using the following method.

[0385] [Method 1-1] How to determine the basic transmission power: Applying common transmission power parameters

[0386] The terminal can apply a set of transmission power parameters (e.g., p0, alpha, closed circuit index) that can be known through ul-powerControl set for the uplink bandwidth portion for all uplink transmissions within each uplink bandwidth portion.

[0387] [Method 1-2] Additional transmission power determination method: Different transmission power parameters can be applied.

[0388] The terminal can apply a set of transmit power parameters (e.g., p0, alpha, closed circuit index) known through upper layer signaling ul-powerControl-r17 within a joint TCI state (TCI-State) or a separate TCI state (TCI-UL-State).

[0389] The terminal may report to the base station whether it supports at least one combination of [Method 1-1] and [Method 1-2] through a terminal capability report. In addition, the terminal may receive configuration from the base station for at least one combination of [Method 1-1] and [Method 1-2] through upper layer signaling.

[0390] FIG. 7 is a diagram illustrating an example of the operation of a base station and a terminal operating with multiple TRPs, including a TRP that supports only an uplink reception function according to one embodiment of the present disclosure.

[0391] The terminal (710) can be connected to and operate with a base station that operates with multiple TRPs as described above. Basically, the terminal can assume that each of the plurality of TRPs supports both uplink reception and downlink transmission. At this time, in addition to the conventional TRP (700) that can support both uplink reception and downlink transmission, the base station can also operate a TRP (705) that supports only uplink reception for the purpose of improving uplink coverage from the terminal's perspective or for the purpose of energy saving benefits that can be obtained by saving downlink transmission power at the base station. This TRP that supports only uplink reception can be called a UL-only TRP. The terminal can assume that no downlink transmission is performed from this UL-only TRP. At this time, the base station and the terminal can consider at least one or more combinations of the following as assumptions for this UL-only TRP.

[0392] The UL-only TRP can operate as a UL-only TRP only for specific terminals. That is, although the UL-only TRP actually has both uplink reception and downlink transmission functions, it can only support uplink reception for specific terminals under specific conditions (for example, by notifying the terminal that it is connected to the UL-only TRP through a combination of at least one of specific upper layer signaling, MAC-CE, and L1 signaling). That is, it can support downlink transmission for other terminals. This UL-only TRP can expand uplink coverage by additionally operating only reception functions of an existing or newly installed TRP near the location when specific terminals exist at the edge of a certain cell coverage.

[0393] The UL-only TRP may be a TRP that does not support downlink transmission for all terminals, but only uplink reception. In other words, the UL-only TRP is a TRP with relatively low production and installation costs, and can be used to receive uplink transmissions from terminals in addition to existing TRPs, thereby achieving reception diversity from the base station's perspective.

[0394] Although the terminal can receive a path loss measurement reference signal from a TRP (700) capable of uplink and downlink operations, since downlink transmission is not performed from a UL-only TRP (705), there may be a problem in that the path loss between the UL-only TRP and the terminal cannot be known when the terminal (710) performs uplink transmission toward the UL-only TRP (705). To solve this situation, the base station and the terminal can perform the following process to obtain path loss information between the UL-only TRP and the terminal according to [Method 2-1].

[0395] [Method 2-1]

[0396] [Process 2-1] Uplink transmission of the terminal

[0397] [Process 2-2] Calculating the difference in path loss at the base station

[0398] [Process 2-3] Transmitting the difference in path loss to the terminal

[0399] [Process 2-4] After obtaining the difference value d_P between the path loss of the TRP that can support both uplink and downlink and the TRP that can support only uplink, the terminal transmits uplink without applying d_P.

[0400] [Process 2-5] Calculating the difference in path loss at the base station

[0401] [Process 2-6] Transmitting the difference in path loss to the terminal

[0402] The terminal can perform the following process to obtain path loss information using another [Method 2-2].

[0403] [Method 2-2]

[0404] [Process 3-1] Terminal Uplink Transmission

[0405] [Process 3-2] Calculating the difference in path loss at the base station

[0406] [Process 3-3] Transmitting the difference in path loss to the terminal

[0407] [Process 3-4] After obtaining the difference value d_P between the path loss of the TRP that can support both uplink and downlink and the TRP that can support only uplink, d_P is applied and the terminal transmits on the uplink.

[0408] [Process 3-5] Calculating the difference in path loss at the base station

[0409] [Process 3-6] Transmitting the difference in path loss to the terminal

[0410] Through the above-described [Method 2-1] and [Method 2-2], the terminal can use the following modified transmission power calculation formula when determining uplink transmission power for UL-only TRP.

[0411] For example, when determining the PUCCH transmission power for UL-only TRP that supports only uplink reception operation, the terminal can modify [Equation 2] as shown in [Equation 11] below and use it. That is, Equation 2 can be modified to Equation 11. In this case, in [Equation 11] below, can be regarded as the d_P value, which is the difference in path loss, may mean that the difference in the corresponding path loss corresponds to one or more path loss measurement reference signals. In this case, the terminal If it corresponds to one path loss measurement reference signal, It can be considered as

[0412] [Equation 11]

[0413] ...Mathematical formula (11)

[0414] As another example, when determining PUSCH transmission power for UL-only TRP that supports only uplink reception operation, the terminal may modify [Equation 4] as in [Equation 12] or [Equation 13] below and use it. That is, Equation 4 may be modified as Equation 12 or Equation 13. In this case, in [Equation 12] or [Equation 13] below, can be regarded as the d_P value, which is the difference in path loss, may mean that the difference in the corresponding path loss corresponds to one or more path loss measurement reference signals. In this case, the terminal If it corresponds to one path loss measurement reference signal, It can be considered as [Mathematical Formula 12] or [Mathematical Formula 13] below is the difference in path loss. They can be distinguished based on whether the value is directly applied to the path loss amount.

[0415] [Equation 12]

[0416] ...Mathematical formula (12)

[0417] [Equation 13]

[0418] ...Mathematical formula (13)

[0419] As another example, when determining PUSCH transmission power for UL-only TRP that supports only uplink reception operation, the terminal may modify [Equation 7] as in [Equation 14] or [Equation 15] below and use it. That is, Equation 7 may be modified as Equation 14 or Equation 15. In this case, in [Equation 14] or [Equation 15] below, can be regarded as the d_P value, which is the difference in path loss, may mean that the difference in the corresponding path loss corresponds to one or more path loss measurement reference signals. In this case, the terminal If it corresponds to one path loss measurement reference signal, It can be considered as [Mathematical Formula 14] or [Mathematical Formula 15] below is the difference in path loss. They can be distinguished based on whether the value is directly applied to the path loss amount.

[0420] [Equation 14]

[0421] ...Mathematical formula (14)

[0422] [Equation 15]

[0423] ...Mathematical formula (15)

[0424] The terminal may be notified from the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling for at least one combination of [Method 2-1] and [Method 2-2], or may expect that at least one combination of [Method 2-1] and [Method 2-2] is fixedly defined in the standard.

[0425] The terminal can report to the base station whether it can support at least one combination of [Method 2-1] and [Method 2-2] as a terminal capability.

[0426] The terminal may consider a combination of at least one of the following items in a method of receiving information from the base station about the difference value or change in path loss amount.

[0427] [Method 3-1]

[0428] The terminal can receive the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change amount of the d_P value, from the base station through upper layer signaling.

[0429] [Method 3-2]

[0430] The terminal receives the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change amount of the d_P value, from the base station through upper layer signaling, and can then update the preset value by receiving MAC-CE signaling from the base station.

[0431] [Method 3-3]

[0432] The terminal may receive the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change amount of the d_P value, from the base station through upper layer signaling, and thereafter be instructed through DCI.

[0433] [Method 3-4]

[0434] The terminal receives the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change amount of the d_P value, from the base station through upper layer signaling, and then receives two or more CSI-RSs from the base station and implicitly receives the d_P or d_P'' value through the difference in reception power of the corresponding CSI-RSs.

[0435] [Method 3-5]

[0436] The terminal can receive the d_P or d_P'' value from the base station through a combination of at least one of [Method 3-1] to [Method 3-4] and update the preset value.

[0437] A method for a terminal to receive uplink scheduling including information related to a difference value of path loss from a base station may consider a combination of at least one of the following items.

[0438] [Method 4-1]

[0439] A terminal can receive one or more joint TCI states or UL TCI states from a base station through upper layer signaling, and at this time, as shown in [Table 20] below, the terminal can receive information on the difference value of path loss within one or more joint TCI states or UL TCI states. The names of the RRC IEs (information elements) in Table 20 are only examples and can be expressed with other names.

[0440] [Table 20]

[0441]

[0442] In the above [Table 20], the terminal can set pathlossOffset as upper layer signaling for the difference value of the path loss amount, and the value can be an integer from Xs to Xe.

[0443] For example, Xs and Xe can be 0 and 30, respectively. As another example, Xs and Xe can be -10 and 50, respectively, and the values ​​can be in increments of 1 dB. As another example, Xs and Xe can be 2 and 32, respectively, and the values ​​can be in increments of 2 dB.

[0444] [Method 4-2]

[0445] The terminal can receive one or more joint TCI states or UL TCI states from the base station as upper layer signaling, and the terminal can receive one or more difference values ​​for path loss in the BWP-UplinkDedicated, which is upper layer signaling for the uplink bandwidth, and each difference value for path loss can be linked to one or more groups of path loss measurement reference signals. In addition, the terminal can additionally receive upper layer signaling in the joint TCI state or UL TCI state, which indicates whether to apply the difference value for path loss in addition to the path loss measured through the path loss measurement reference signal that can be set as upper layer signaling. [Table 21] below is one example that can express the above method, and the link between the difference values ​​for path loss and the groups of path loss measurement reference signals may not be limited thereto. The names of the RRC IEs in Table 24 are only examples and can be expressed by other names.

[0446] [Table 21]

[0447]

[0448] The terminal can receive a pathlossOffset as a higher layer signaling for the difference value of the path loss amount, and the value can be an integer from Xs to Xe.

[0449] For example, Xs and Xe can be 0 and 30, respectively. As another example, Xs and Xe can be -10 and 50, respectively, and the values ​​can be in increments of 1 dB. As another example, Xs and Xe can be 2 and 32, respectively, and the values ​​can be in increments of 2 dB.

[0450] [Method 4-3]

[0451] The terminal can receive one or more joint TCI states or UL TCI states as upper layer signaling from the base station, and the terminal can receive one path loss difference value set within the BWP-UplinkDedicated, which is an upper layer signaling for the uplink bandwidth. In this case, the terminal can assume that the path loss difference value is always applied to a specific TCI state depending on how it operates with multiple TRPs.

[0452] [Table 22] below may be one example of how the above method can be expressed, but may not be limited thereto. The names of the RRC IEs in Table 22 are only examples and may be expressed with other names.

[0453] [Table 22]

[0454]

[0455] ULonlyNode2 can be defined as a condition for the pathlossOffset to be set by the base station within BWP-UplinkDedicated, which is an upper layer signaling for the terminal. The condition ULonlyNode2 can mean that the terminal operates within a cell that includes a UL-only TRP, which can mean when a specific upper layer signaling is set.

[0456] If the terminal does not set the above pathlossOffset in BWP-UplinkDedicated, the terminal may consider the difference value of the path loss amount as 0.

[0457] The terminal can receive a pathlossOffset as a higher layer signaling for the difference value of the path loss amount, and the value can be an integer from Xs to Xe.

[0458] For example, Xs and Xe can be 0 and 30, respectively. As another example, Xs and Xe can be -10 and 50, respectively, and the values ​​can be in increments of 1 dB. As another example, Xs and Xe can be 2 and 32, respectively, and the values ​​can be in increments of 2 dB.

[0459] [Method 4-4]

[0460] The terminal can receive a path loss difference value from the base station through upper layer signaling. The path loss difference value setting may vary by bandwidth part, or may vary by cell, and the same value may be set for all bandwidth parts within the cell. In this case, the terminal can expect that a new field indicating whether to apply the path loss difference value will be included in the DCI when the path loss difference value is set. Through this new field in the DCI, the terminal can distinguish whether the uplink transmission is for a UL-only TRP or an uplink transmission for a TRP that can operate both uplink and downlink through the DCI from the base station.

[0461] [Method 4-5]

[0462] The terminal may consider at least one combined method among the above [Method 4-1] to [Method 4-4].

[0463] The terminal may be notified from the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling for at least one combination of [Method 4-1] to [Method 4-5], or may expect that at least one combination of [Method 4-1] to [Method 4-5] is fixedly defined in the standard.

[0464] The terminal may report to the base station, based on its terminal capabilities, whether it can support at least one combination of [Method 4-1] to [Method 4-5]. In this case, if the terminal reports to the base station, based on its terminal capabilities, that it can support a combination of one or more specific methods, it may be considered that the terminal has reported that it cannot support one or more other combinations of specific methods.

[0465] The terminal may determine whether to apply the difference value of the path loss amount by considering at least one combination of [Method 4-1] to [Method 4-5] when performing dynamic grant-based PUSCH transmission scheduled based on DCI, Type-2 configured grant-based PUSCH transmission activated through DCI, Type-1 configured grant-based PUSCH transmission configured through upper layer signaling, PUCCH transmission, SRS transmission, and PRACH transmission.

[0466] <Example 2: Enhanced Power Headroom Reporting Method for Beam Management of Multiple UL-only TRPs>

[0467] In one embodiment of the present disclosure, an improved power headroom reporting method is described for reporting MPE for UL beams associated with each UL-only TRP to manage uplink beams (or UL beams) of multiple UL-only TRPs supporting uplink reception. This embodiment may operate in combination with other embodiments.

[0468] The terminal may be configured with fields for reporting the power headroom and the maximum transmit power PCMAX,f,c and the P-MPR level applied to determine the maximum transmit power PCMAX,f,c at the time of power headroom reporting to the base station using MAC CE when power headroom reporting is triggered, and MPEi for reporting the P-MPR level to be applied to satisfy the MPE requirement when transmitting based on at least one and at most four selected Resourcei among the resources set in the upper layer parameter mpe-ResourcePoolToAddModList, and Resourcei corresponding to the MPEi. The terminal may select at least one and at most four Resourcei among the resources set in mpe-ResourcePoolToAddModList according to the terminal implementation or according to a rule mutually defined by the base station and the terminal. For example, the terminal may select four resources having the smallest MPEi values ​​reported for Resourcei among the resources set in mpe-ResourcePoolToAddModList, select them as Resource1 to Resource4, and report the corresponding MPE1 to MPE4 to the base station. Alternatively, the terminal may select four resources having the smallest MPEi values ​​reported for Resource i among the resources set in mpe-ResourcePoolToAddModList, excluding resources associated with a PUSCH for which power headroom is reported (e.g., resources set as reference signals for QCL type D of a TCI-state or TCI-UL-state applied to transmit a PUSCH), select them as Resource1 to Resource4, and report the corresponding MPE1 to MPE4 to the base station. The following Figures 8A to 8C illustrate MAC CE formats for reporting power headroom by a terminal to a base station.The first MAC CE format (800) illustrates a PHR MAC CE having a single entry, the second MAC CE format (810) illustrates a format for supporting a supporting cell having up to 8 uplinks configured among PHR MAC CEs having multiple entries, and the third MAC CE format (820) illustrates a format for supporting a supporting cell having more than 8 uplinks configured among MAC CEs having multiple entries. The terminal can report a power headroom level for reporting a quantized power headroom value to the base station through the PH field (801). In this case, in the case of a single entry, the power headroom level for the PCell is reported, and in the case of multiple entries, the terminal can report a power headroom level for an NR serving cell or an LTE serving cell. Here, Type 1 refers to the power headroom that reports the difference between the power for transmitting UL-SCH for the corresponding serving cell and the maximum transmission power of the terminal, and Type 2 refers to the power headroom that reports the difference between the power for transmitting UL-SCH and PUCCH transmitted to SpCell of the corresponding serving cell (specifically, LTE (or E-UTRA) MAC entity in case of EN-DC or NE-DC or NGEN-DC) and the maximum transmission power of the terminal. If the upper layer parameter mpe-Reporting-FR2 for MPE reporting is configured for a serving cell operating in FR2, the UE sets the P field (802) to 0 if it applies a P-MPR value smaller than P-MPR_00 defined in the RAN4 standard (e.g., TS 38.101-2) for the corresponding PH report to satisfy the MPE requirement, and sets the P field (802) to 1 if it applies a P-MPR value larger than P-MPR_00 defined in the RAN4 standard to satisfy the MPE requirement for the corresponding PH report.The maximum transmit power of the terminal used to determine the PH value reported by the terminal. (NR or LTE) or To report (LTE), the UE determines the nominal UE transmit power levels as defined in the RAN4 specification (e.g., TS 38.133) and reports an index for the nominal UE transmit power level to the base station through the PMAX,f,c field (803). If the upper layer parameter mpe-Reporting-FR2 for MPE reporting is set for a serving cell operating in FR2 and the P field (802) is set to 1, the UE can set the MPE field (804) to indicate the power backoff applied to the corresponding PH report to satisfy the MPE requirement. At this time, the UE determines the P-MPR level as defined in the RAN4 specification (e.g., TS 38.101-2) and reports an index for the P-MPR level to the base station through the MPE field (804). The Bi (805) field can be used to indicate whether to report the MPEi (807) field for the candidate beam identified by Resourcei (808) to the base station, and if the terminal reports the MPEi (807) field for the candidate beam identified by Resourcei (808) to the base station, the Bi (805) field is set to 1, and if the terminal does not report the MPEi (807) field for the candidate beam identified by Resourcei (808) to the base station, the Bi field (805) is set to 0. If the upper layer parameter mpe-Reporting-FR2 for MPE reporting is set for a serving cell operating in FR2, the terminal may report the MPEi (807) field for the candidate beam identified by Resourcei (808) according to the RAN4 standard (e.g., TS 38.If a P_MPR value smaller than P-MPR_00 defined in 101-2) is applied to satisfy the MPE requirement, Pi (806) is set to 0, and if a P_MPR value larger than P-MPR_00 defined in the RAN4 specification is applied to satisfy the MPE requirement for a candidate beam identified by Resourcei (808), Pi (806) is set to 1. If the upper layer parameter mpe-Reporting-FR2 for MPE reporting is set for a serving cell operating in FR2, and the corresponding Pi (806) is set to 1, the terminal can set the MPEi field (807) to indicate the power backoff applied to satisfy the MPE requirement. At this time, the terminal determines the P-MPR level defined in the RAN4 standard (e.g., TS 38.101-2) and reports the index thereof to the base station through the MPEi field (807). As described above, the terminal can set the Resourcei field (808) to identify a candidate beam for reporting the P-MPR value applied through the MPEi field (807) among the resources set in the upper layer parameter mpe-ResourcePoolToAddModList. If the terminal supports PH reporting with multiple entries, the presence or absence of a PH field for a serving cell identified by ServCellIndex i can be indicated through the Ci field (809). If the Ci field (809) is set to 1, the PH field for the serving cell with ServCellIndex i is reported, and if the Ci field (809) is set to 0, the PH field for the serving cell with ServCellIndex i is not reported.If the PH value reported to the corresponding PH area (801) by the terminal is calculated based on real transmission, the V area (811) is set to 0, and if the PH value reported to the corresponding PH area (801) by the terminal is calculated based on a reference format, the V area (811) is set to 1.

[0469] In this way, the terminal can additionally report to the base station information about the P-MPR value for satisfying the MPE requirement for the candidate beam along with the power headroom for one or more serving cells.

[0470] The upper layer parameter mpe-ResourcePoolToAddModList may set multiple MPE-Resources to indicate reference signals for identifying candidate beams for which P-MPR information can be reported, as described above. For example, the MPE-Resource set in the first entry of mpe-ResourcePoolToAddModList may have MPE-ResourceId set to 1, and the terminal may set Resourcei (808) in FIG. 8 to 000000 (binary consisting of 6 bits) to indicate the corresponding MPE-Resource. The MPE-Resource may be defined as shown in Table 23 below, and CSI-RS or SSB may be indicated through the MPE-Resource.

[0471] [Table 23]

[0472]

[0473] As can be seen in Table 23 above, CSI-RS (NZP-CSI-RS-ResourceId) or SSB (SSB-Index) can be indicated as a reference signal for identifying a candidate beam, and the terminal can report the P-MPR value for the candidate beam that can be identified through the reference signal to the base station along with the power headroom report.

[0474] If the UL only TRP cannot transmit a downlink reference signal, the UE must use the SRS, which is an uplink reference signal, to operate the uplink beam for the UL only TRP. As a specific example, the base station can schedule SRS transmission for a certain usage to the UE to determine the uplink beam of the uplink signal transmitted through the UL only TRP. The SRS for a certain usage can be defined as an SRS resource set with the usage of 'beamManagement'. The UE can transmit the SRS for a certain scheduled usage (e.g., beamManagement), and the base station can receive the SRS through the UL only TRP. Among multiple SRS resources within the SRS resource set for a certain usage (e.g., beamManagement), the SRS resource with the best reception performance (e.g., received SNR, received SINR, RSRP, etc.) can be determined as the reference signal for indicating the uplink beam for the corresponding UL only TRP. If the base station decides to receive the uplink signal of the terminal using the UL only TRP, the base station can activate a TCI-UL-State to the terminal through MAC CE, indicating a reference signal (e.g., an SRS resource ID for an SRS resource received with the largest RSRP for the UL only TRP among SRS resources in an SRS resource set for beamManagement purposes) as a referenceSignal, and can indicate this to the terminal through DCI (if necessary, such as when multiple TCI-UL-States are activated through MAC CE, indicate this through DCI).

[0475] FIG. 9 illustrates an example of a case in which multiple UL only TRPs are operated according to one embodiment of the present disclosure.

[0476] The terminal (915) can operate a TRP (900) capable of both uplink reception and downlink transmission, and multiple UL only TRPs (905, 910) that can only support uplink reception for the purpose of increasing uplink coverage. At this time, the multiple UL only TRPs (905, 910) can perform a multi-TRP operation that simultaneously supports two or more TRPs along with the TRP (900) capable of both uplink and downlink transmission and reception, or can perform a TRP selection operation that selects and operates only some UL only TRPs with better uplink signal reception performance among the multiple UL only TRPs (905, 910).

[0477] In order to perform TRP selection or multi-TRP operation using multiple UL only TRPs as illustrated in FIG. 9, the base station may need beam information for the UL only TRPs. That is, if the base station uses a UL only TRP to receive an uplink signal of the corresponding terminal, the base station may select a UL only TRP with good uplink signal reception performance based on beam information reported by the terminal. Each uplink beam that the terminal reports to the base station may be used to transmit an uplink signal with a different UL only TRP. As a specific example, the first UL only TRP 1 may receive the first SRS resource (the SRS resource with the lowest SRS-ResourceId in the SRS resource set) in the SRS resource set whose usage is beamManagement with the highest reception strength, and the second UL only TRP 2 may receive the second SRS resource (the SRS resource with the second-lowest SRS-ResourceId in the SRS resource set) in the SRS resource set with the highest reception strength. In this case, if the base station instructs the terminal with a TCI-UL-State (or a TCI-State that can indicate an uplink reference signal) that indicates the first SRS resource as a referenceSignal, it can be understood that the base station implicitly instructs the terminal to transmit the uplink signal with the first UL only TRP 1. If the base station instructs the terminal with a TCI-UL-State (or a TCI-State that can indicate an uplink reference signal) that indicates the second SRS resource as a referenceSignal, it can be understood that the base station implicitly instructs the terminal to transmit the uplink signal with the second UL only TRP 2.

[0478] As described above, after the base station receives an SRS resource set for a certain purpose (e.g., beamManagement) transmitted by a terminal and determines a TRP to be supported for the terminal, the status of the uplink and downlink beams being supported may change due to movement or rotation of the terminal. In addition, the magnitude of the impact on the human body may change depending on the orientation of the terminal, and accordingly, a change may occur in the P-MPR value to satisfy the MPE requirement. In addition, as described in FIGS. 8A to 8C, the P-MPR values ​​for candidate beams as well as the P-MPR values ​​for the uplink channel or uplink reference signal transmitted at the time when the power headroom is reported may be reported. However, as can be seen in Table 23, since only a downlink reference signal such as CSI-RS or SSB can be indicated as a reference signal for identifying a candidate beam, a problem may occur in identifying a candidate beam corresponding to a UL only TRP where a downlink channel and downlink reference signal are not operated. In this situation where UL only TRP is operated, the following methods can be considered to report P-MPR information of candidate beams for UL only TRP to the base station together using power headroom reporting.

[0479] [Method 1] Indicate the uplink reference signal with the upper layer parameter MPE-Resource to identify the candidate beam.

[0480] Method 1 can add SRS (SRS-ResourceId) as well as CSI-RS (indicated by NZP-CSI-RS-ResourceId) and SSB (indicated by SSB-Index) as reference signals that can be indicated by mpe-ReferenceSignal of the upper layer parameter MPE-Resource for identifying candidate beams. In order to indicate candidate beams identified based on SRS through the upper layer parameter MPE-Resource, the terminal capability to support the corresponding function may be required. That is, when the terminal reports power headroom, the terminal must be able to report P-MPR values ​​for multiple candidate beams to support the function, and the terminal must support the terminal capability to use not only the downlink reference signal (e.g., CSI-RS or SSB) but also the uplink reference signal (e.g., SRS) to identify the candidate beams.

[0481] As an example of Method 1, the base station can set the upper layer parameters as in Table 24 to indicate SRS resources to a terminal that can support Method 1 using the mpe-ReferenceSignal of MPE-Resource.

[0482] [Table 24]

[0483]

[0484] Referring to Table 24, a CSI-RS, SSB, or SRS resource can be configured with the mpe-ReferenceSignal indicated by the MPE-Resource. When reporting power headroom using the MAC CE format of 8C in FIG. 8A as described above, the candidate beam identified by Resourcei can be defined with the same transmit or receive filter as the mpe-ReferenceSignal of the MPE-Resource indicated by the corresponding field. Assuming that the terminal transmits an uplink signal based on the corresponding candidate beam, the terminal can report the P-MPR to satisfy the MPE requirement in the MPEi field.

[0485] As an example of another method 1, the base station can set a new MPE-ULResource to support UL only TRP as shown in Table 25, with upper layer parameters to indicate SRS resource to the terminal that can support method 1 with mpe-ReferenceSignal of MPE-Resource.

[0486] [Table 25]

[0487]

[0488] Referring to Table 25, an SRS resource can be set with mpe-ReferenceSignal indicated by MPE-ULResource, and the corresponding upper layer parameter can be used to support UL only TRP. In order to identify a candidate beam for UL only TRP using MPE-ULResource defined as in Table 25 and to report a P-MPR value corresponding to the candidate beam, the MAC CE format of FIGS. 8A to 8C described above can be modified and used. For example, all MAC CE areas are the same, and if a 1-bit R area for reserve purposes is defined as an area for a new purpose and the value of the area is set to 1, the reference signal indicated by the Resourcei area can be defined as an SRS resource indicated by the MPE-ULResource. If the value of the area for the new purpose is set to 0, the reference signal indicated by the Resourcei area can be defined as a downlink reference signal indicated by the MPE-Resource. The new MPE-ULResource defined as in Table 25 can also be used in combination with the improved MAC CE format described later in Method 2.

[0489] [Method 2] Uplink reference signal indication using enhanced MAC CE format

[0490] Method 2 specifically describes a new MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams, and proposes a method for a terminal to report information about candidate beams corresponding to UL only TRPs to a base station based on this format.

[0491] As described above, when using the MAC CE for power headroom reporting according to FIGS. 8A to 8C, there is a problem that P-MPR information for a candidate uplink beam for a UL only TRP in which a downlink reference signal is not operated cannot be reported to the base station. This is because only the downlink reference signal can be set as a reference signal in the MPE-Resource indicated by the Resourcei area (808) in the MAC CE format illustrated in FIGS. 8A to 8C.

[0492] In order to solve the problem of not being able to indicate candidate uplink beams when performing power headroom reporting that additionally reports P-MPR values ​​for candidate beams in a situation where UL only TRP is operated, a new MAC CE format for improved power headroom reporting can be proposed as follows.

[0493] When reporting power headroom, a terminal may add a new field to the MAC CE format for reporting P-MPR values ​​for candidate beams in addition to the P-MPR value for the uplink channel for which power headroom is reported. The new field may be used to indicate the type of resource indicated to identify the candidate beams reported together with the power headroom report.

[0494] The field for indicating the type of resource to identify candidate beams added to the new enhanced MAC CE format can be configured in two different ways:

[0495] [Method 2-1] A new area can be added to indicate the type of resource for each Resourcei.

[0496] A terminal can define an i-th region consisting of 1 bit (or more bits than 1 bit (e.g., 2 bits) if the number of resource types that can be indicated is greater than 2) to indicate a resource type for Resourcei using an enhanced MAC CE format for power headroom reporting, and the new i-th region consisting of 1 bit (or more bits than 1 bit) corresponds to Resourcei. The new i-th region consisting of 1 bit (or more bits than 1 bit) indicates whether the Resourcei region refers to an MPE-Resource or an SRS-Resource included in srs-ResourceToAddModList in SRS-Config. Alternatively, if the new i-th region consists of 2 bits more than 1, the region can indicate whether the Resourcei region refers to an NZP-CSI-RS-Resource or an SSB or an SRS-Resource included in srs-ResourceToAddModList in SRS-Config.

[0497] Figures 10A through 10C illustrate a new MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams.

[0498] The terminal can use the enhanced MAC CE format for power headroom reporting to indicate the resource type of Resourcei (1008) using the Fi field (1012). The Fi field consists of 1 bit. If the Fi field (1012) is set to 0, the Resourcei field (1008) corresponding to the Fi field (1012) can indicate an MPE-Resource included in mpe-ResourcePoolToAddModList. If the Fi field (1012) is set to 1, the Resourcei field (1008) corresponding to the Fi field (1012) can indicate an SRS-Resource included in srs-ResourceToAddModList in SRS-Config.

[0499] Figures 11A through 11C illustrate another new MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams.

[0500] The terminal can use the enhanced MAC CE format for power headroom reporting to indicate the resource type of Resourcei (1108) using the Fi field (1112). The Fi field (1112) consists of 1 bit. If the Fi field (1112) is set to 0, the Resourcei field (1108) corresponding to the Fi field (1112) can indicate an MPE-Resource included in mpe-ResourcePoolToAddModList. If the Fi field (1112) is set to 1, the Resourcei field (1108) corresponding to the Fi field (1112) can indicate an SRS-Resource included in srs-ResourceToAddModList in SRS-Config.

[0501] Figures 12A-12B illustrate another new MAC CE format for power headroom reporting that can additionally report P-MPR values ​​for candidate beams.

[0502] The terminal can use the enhanced MAC CE format for power headroom reporting to indicate the resource type of Resourcei (1208) using the Fi field (1212). The Fi field (1212) consists of 1 bit. If the Fi field (1212) is set to 0, the Resourcei field (1208) corresponding to the Fi field (1212) can indicate an MPE-Resource included in mpe-ResourcePoolToAddModList. At this time, the first bit of the 7 bits of the Resourcei field (1208) is always set to 0, and the remaining bits of this field (1208) indicate an MPE-Resource included in mpe-ResourcePoolToAddModList. If the Fi area (1212) is set to 1, the Resourcei area (1208) corresponding to the Fi area (1212) can indicate an SRS-Resource included in srs-ResourceToAddModList in SRS-Config or an SRS-PosResource included in srs-PosResourceToAddModList. At this time, if the first bit of the 7 bits of the Resourcei area (1208) is set to 0, the remaining bits of this area (1208) indicate an SRS-Resource included in srs-ResourceToAddModList. If the first bit of the 7 bits of the Resourcei area (1208) is set to 1, the remaining bits of this area (1208) indicate an SRS-PosResource included in srs-PosResourceToAddModList.

[0503] [Method 2-2] A new area can be added to indicate the type of resource for the MAC CE format.

[0504] Unlike Method 2-1, Method 2-2 supports an operation to support a case where all information about additionally reported candidate beams is information about UL only TRPs or information about TRPs that can support both uplink and downlink transmission and reception by using the MAC CE format for power headroom reporting. By using 1 bit of the R area for reserve in the MAC CE format described in FIGS. 8A to 8C, the resource type of Resourcei for identifying candidate beams reported in the corresponding MAC CE format can be collectively indicated.

[0505] Figures 13A to 13C illustrate a MAC CE format capable of collectively indicating the type of reference signal in an area for identifying a candidate beam.

[0506] The terminal can indicate the resource types of all Resourcei (Resource1 to Resource4, 1308) using the F field (1312) using the enhanced MAC CE format for power headroom reporting. The F field (1312) consists of 1 bit. If the F field (1312) is set to 0, all Resourcei fields (Resource1 to Resource4, 1308) corresponding to the F field (1312) can indicate MPE-Resource included in mpe-ResourcePoolToAddModList. If the F field (1312) is set to 1, all Resourcei fields (Resource1 to Resource4, 1308) corresponding to the F field (1312) can indicate SRS-Resource included in srs-ResourceToAddModList in SRS-Config.

[0507] Figure 14 shows an operation flow diagram of a base station and a terminal to support UL only TRP.

[0508] The terminal can perform initial access (1400). Thereafter, the terminal can perform a terminal capability report (1401) according to a request from the base station (omitted in FIG. 14). At this time, the terminal can report not only the terminal capability to report P-MPR information for a candidate beam to the base station through a power headroom report, but also the terminal capability to support uplink transmission based on UL only TRP. In addition, the terminal can report to the base station through the terminal capability that it can support some or all of the methods including the detailed methods of Method 1 to Method 2 for indicating a candidate beam for UL only TRP as described above. Thereafter, the terminal can receive upper layer parameters (RRC parameters) from the base station (1402). At this time, not only the MPE-Resource for identifying the candidate beam but also RRC parameters related to the method described above in the present invention, such as the SRS resource set, can be set in the terminal in the set RRC parameter (1402). The terminal can transmit an SRS to the base station (1403). At this time, the terminal can transmit an SRS resource set whose usage is beamManagement to the base station. The terminal can transmit multiple SRS resources within the SRS resource set whose usage is beamManagement through different uplink beams. Thereafter, the terminal can be reconfigured with RRC parameters according to a request from the base station (1404). At this time, the reconfigured RRC parameters can include settings for supporting UL-only TRP. For example, the TCI-UL-State set as an SRS resource included in the SRS resource set for beamManagement transmitted by the referenceSignal in the previous step (1403) can be reconfigured with the RRC parameters.If power headroom reporting is triggered, the terminal can report power headroom and power back-off (or P-MPR) information for candidate beams to the base station using the enhanced MAC CE format for power headroom reporting (1406). Thereafter, the terminal can receive a new TCI state indicated by the base station and perform uplink and downlink transmission and reception based on the new TCI state (1008).

[0509] The base station can perform initial access with the terminal (1410). Thereafter, the base station can request a terminal capability report from the terminal (omitted in FIG. 14), and accordingly, can receive the terminal capability from the terminal (1411). Thereafter, the base station can set upper layer parameters (RRC parameters) for the terminal with reference to the reported terminal capability. At this time, the base station can set RRC parameters related to the method described above in the present invention, such as MPE-Resource for identifying candidate beams as well as SRS resource set in the set RRC parameter (1402). The base station can receive the SRS transmitted by the terminal (1413). At this time, an SRS whose purpose is beamManagement can be received, and a TRP to be supported (the TRP here can include both a TRP that can support both DL and UL and a UL-only TRP) and a TCI state corresponding thereto can be determined based on the TRP that received the SRS (the TRP here can include both a TRP that can support both DL and UL and a UL-only TRP) and the reception performance of the received SRS (e.g., RSRP or reception SNR or reception SINR, etc.). The base station can reset RRC parameters in the terminal by considering the TRP to be supported for the terminal and the TCI state corresponding thereto (1414). For example, the TCI-UL-State set as an SRS resource included in the SRS resource set for beamManagement, which referenceSignal received in the previous step (1413), can be reset to an RRC parameter. Afterwards, the base station can instruct the terminal to support a TCI state (1415), and transmit a downlink channel to the terminal or receive an uplink channel by referring to the instructed TCI state until the TCI state is updated.The base station can receive the power headroom and power back-off (or P-MPR) for the candidate beam reported from the terminal using the enhanced MAC CE format (1416). Based on the information about the received power headroom and candidate beam, the base station can decide whether to support UL-only TRP or not (1417). Afterwards, the base station can indicate a new TCI state to the terminal, considering whether to support UL-only TRP or other TRPs, and whether to update the beam (1418).

[0510] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0511] FIG. 15 is a diagram illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0512] Referring to FIG. 15, the terminal may include a transceiver, which refers to a terminal receiving unit (1500) and a terminal transmitting unit (1510), a memory (not shown), and a terminal processing unit (1505, or a terminal control unit or processor). Depending on the communication method of the terminal described above, the transceiver units (1500, 1510), the memory, and the terminal processing unit (1505) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the transceiver unit, the memory, and the processor may be implemented in the form of a single chip.

[0513] A transceiver unit can transmit and receive signals to and from a base station. The signals may include control information and data. To this end, the transceiver unit may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is merely one embodiment of the transceiver unit, and the components of the transceiver unit are not limited to the RF transmitter and RF receiver.

[0514] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit a signal output from the processor through the wireless channel.

[0515] Memory can store programs and data necessary for the terminal's operation. Furthermore, memory can store control information or data included in signals transmitted and received by the terminal. Memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0516] Additionally, the processor can control a series of processes to enable the terminal to operate according to the aforementioned embodiments. For example, the processor can receive DCI consisting of two layers and control components of the terminal to simultaneously receive multiple PDSCHs. There may be multiple processors, and the processors can perform component control operations of the terminal by executing programs stored in memory.

[0517] FIG. 16 is a diagram illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0518] Referring to FIG. 16, the base station may include a transceiver, which refers to a base station receiver (1600) and a base station transmitter (1610), a memory (not shown), and a base station processor (1605, or a base station control unit or processor). Depending on the communication method of the base station described above, the transceiver (1600, 1610), the memory, and the base station processor (1605) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. In addition, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0519] The transceiver can transmit and receive signals with the terminal. Here, the signals may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0520] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit the signal output from the processor through the wireless channel.

[0521] The memory can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0522] The processor can control a series of processes to enable the base station to operate according to the aforementioned embodiments of the present disclosure. For example, the processor can configure two layers of DCIs containing allocation information for multiple PDSCHs and control each component of the base station to transmit them. There may be multiple processors, and the processors can perform component control operations of the base station by executing programs stored in memory.

[0523] [Unified TCI state]

[0524] 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.

[0525] 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.

[0526] 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.

[0527] 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.

[0528] 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.

[0529] 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.

[0530] 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.

[0531] 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.

[0532] 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.

[0533] 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).

[0534] 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).

[0535] FIG. 17 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.

[0536] DCI format 1_1 or 1_2 with DL assignment (1700): If a terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from a base station (1701) 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 (1705), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH was successful (1710). At this time, the HARQ-ACK can include the meaning of whether reception of both the DCI and the PDSCH was successful, and if at least one of the DCI and the PDSCH was not received, the terminal can transmit a NACK, and if reception of both was successful, the terminal can transmit an ACK.

[0537] DCI format 1_1 or 1_2 without DL assignment (1750): If the UE receives DCI format 1_1 or 1_2 from the base station that does not include downlink data channel scheduling information (1755) and indicates one joint TCI state or a set of separate TCI states based on the integrated TCI scheme, the UE may assume at least one combination of the following for the DCI:

[0538] Includes scrambled CRC using CS-RNTI.

[0539] All bits assigned to all fields used as RV (Redundancy Version) fields have a value of 1.

[0540] All bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields have a value of 1.

[0541] All bits assigned to all fields used as NDI (New Data Indication) fields have values ​​of 0.

[0542] For FDRA (Frequency Domain Resource Allocation) Type 0, all bits assigned to the FDRA field have values ​​of 0, for FDRA Type 1, all bits assigned to the FDRA field have values ​​of 1, and when the FDRA method is dynamicSwitch, all bits assigned to the FDRA field have values ​​of 0.

[0543] 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 (1760).

[0544] For both DCI format 1_1 or 1_2 with DL assignment (1700) and without DL assignment (1750), if a new TCI state indicated through DCI (1701, 1755) is the same as a TCI state that has already been indicated and applied to an uplink transmission and downlink reception beam, the UE may maintain the previously applied TCI state, and if the new TCI state is different from the previously indicated TCI state, the UE may 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 point after the first slot (1720, 1770) after the time equal to BAT (beam application time, 1715, 1765) after the PUCCH transmission (1730, 1780), and maintain the previously indicated TCI-state until (1725, 1775) before the corresponding slot (1720, 1770). It is available for use.

[0545] For both DCI format 1_1 or 1_2 with DL assignment (1700) and without DL assignment (1750), 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 applies.

[0546] 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.

[0547] 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.

[0548] 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.

[0549] 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.

[0550] [Unified TCI state MAC-CE]

[0551] 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.

[0552] FIG. 18 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.

[0553] Serving Cell ID (1800): This field can indicate which serving cell the MAC-CE is applied to. This field can be 5 bits long. If the serving cell indicated by this field is included in one or more of the upper layer signaling lists 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.

[0554] DL BWP ID (1805): This field can indicate which DL 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. This field can be 2 bits long.

[0555] UL BWP ID (1810): 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. This field can be 2 bits long.

[0556] Pi (1815): 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.

[0557] D / U (1820): 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.

[0558] TCI state ID (1825): 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 a 7-bit TCI-StateId. 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 is 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0559] R: This indicates a reserved bit and can be set to 0.

[0560] For the MAC-CE structure of FIG. 18 described above, the terminal can include the third octet including the P1, P2, ..., P8 fields in FIG. 18 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. 18 described above, the terminal can omit the third octet including the P1, P2, ..., P8 fields in FIG. 18 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. 18 can be regarded as R fields, and all corresponding R fields can be set to 0 bits.

[0561] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0562] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

[0563] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0564] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device implementing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device implementing an embodiment of the present disclosure.

[0565] In the specific embodiments of the present disclosure described above, components included in the embodiments are expressed singularly or plurally, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in plural may be composed of singular elements, or components expressed in singular may be composed of plural elements.

[0566] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples to easily explain the technical contents of the present disclosure and to help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, each of the above embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment can be combined with each other to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure can be combined with each other to operate a base station and a terminal. In addition, other modifications based on the technical idea of ​​the above embodiments can be implemented with other systems such as an FDD LTE system, a TDD LTE system, a 5G or NR system.

[0567] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0568] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0569] In addition, the method of the present disclosure may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the present disclosure.

[0570] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

[0571] According to one embodiment of the present disclosure, a method for a terminal to perform communication may include a step of reporting terminal capability information to a base station to perform an initial access. The method may include a step of receiving an RRC (Radio Resource Control) configuration message for identifying a candidate beam from the base station. The method may include a step of transmitting an SRS (Sounding Reference Signal) to the base station based on the RRC message. The method may include a step of receiving an RRC reconfiguration message including configuration information for supporting an Uplink (UL) only Transmission Reception Point (TRP) from the base station. The method may include a step of transmitting power information for the candidate beam to the base station using a MAC CE (Medium Access Control Control Element) based on the RRC reconfiguration message.

[0572] In one embodiment, the terminal capability information may include an indicator indicating whether the terminal supports UL only TRP based uplink transmission.

[0573] In one embodiment, the RRC setup message may include information about Maximum Permissible Exposure (MPE) resource information and SRS resources for identifying candidate beams.

[0574] In one embodiment, the power information may include power headroom information for the candidate beam and information regarding power back-off for the candidate beam.

[0575] In one embodiment, the MAC CE may include identifier information for the candidate beam and an indicator indicating the type of resource corresponding to the candidate beam.

[0576] In one embodiment, if the indicator indicating the type of resource corresponding to the candidate beam is '0', the resource corresponding to the candidate beam may be an MPE resource. If the indicator indicating the type of resource corresponding to the candidate beam is '1', the resource corresponding to the candidate beam may be an SRS resource.

[0577] In one embodiment, when the indicator indicating the type of resource corresponding to the candidate beam is set to 2 bits, the indicator indicating the type of resource corresponding to the candidate beam may correspond to at least one of an NZP-CSI-RS resource, an SSB resource, and an SRS resource.

[0578] According to one embodiment of the present disclosure, a terminal for performing communication in a wireless communication system may be provided, and the terminal may include a transceiver and at least one processor connected to the transceiver. The at least one processor may report terminal capability information to a base station to perform an initial access. The at least one processor may receive an RRC (Radio Resource Control) configuration message for identifying a candidate beam from the base station. The at least one processor may transmit an SRS (Sounding Reference Signal) to the base station based on the RRC message. The at least one processor may receive an RRC reconfiguration message including configuration information for supporting an UL (Uplink) only TRP (Transmission Reception Point) from the base station. The at least one processor may transmit power information for the candidate beam to the base station using a MAC CE (Medium Access Control Control Element) based on the RRC reconfiguration message.

[0579] According to one embodiment of the present disclosure, a method for a base station to perform communication may include receiving terminal capability information from a terminal to perform an initial access. The method may include transmitting an RRC (Radio Resource Control) configuration message for identifying a candidate beam to the terminal. The method may include receiving an SRS (Sounding Reference Signal) from the terminal based on the RRC message. The method may include transmitting an RRC reconfiguration message including configuration information for supporting an Uplink (UL) only Transmission Reception Point (TRP) to the terminal. The method may include receiving power information for the candidate beam from the terminal through a MAC CE (Medium Access Control Control Element) based on the RRC reconfiguration message.

[0580] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory storage medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is permanently stored in the storage medium and cases where data is temporarily stored. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0581] According to one embodiment, the method according to various embodiments disclosed in the present document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) through an application store or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

Claims

1. In a method for a terminal to perform communication in a wireless communication system, A step of reporting terminal capability information to a base station to perform initial access; A step of receiving an RRC (Radio Resource Control) configuration message for identifying a candidate beam from the base station; A step of transmitting an SRS (Sounding Reference Signal) to the base station based on the RRC message; A step of receiving an RRC reset message including configuration information for supporting UL (Uplink) only TRP (Transmission Reception Point) from the base station; and A method comprising: a step of transmitting power information for the candidate beam to the base station through a MAC CE (Medium Access Control Control Element) based on the RRC reset message; 2. In paragraph 1, A method wherein the terminal capability information includes an indicator indicating whether the terminal supports UL only TRP based uplink transmission.

3. In paragraph 1, A method wherein the RRC setup message includes information about MPE (Maximum Permissible Exposure) resources and SRS resources for identifying candidate beams.

4. In paragraph 1, A method wherein the power information includes power headroom information for the candidate beam and information about power back-off for the candidate beam.

5. In paragraph 1, A method wherein the MAC CE includes identifier information for the candidate beam and an indicator indicating a resource type corresponding to the candidate beam.

6. In paragraph 5, If the indicator indicating the type of resource corresponding to the candidate beam is '0', the resource corresponding to the candidate beam is an MPE resource, A method in which, when the indicator indicating the type of resource corresponding to the candidate beam is '1', the resource corresponding to the candidate beam is an SRS resource.

7. In paragraph 5, When the indicator indicating the resource type corresponding to the above candidate beam is set to 2 bits, A method in which an indicator indicating a type of resource corresponding to the candidate beam corresponds to at least one of an NZP-CSI-RS resource, an SSB resource, and an SRS resource.

8. In a terminal performing communication in a wireless communication system, Transmitter and receiver; and At least one processor connected to the transceiver, wherein the at least one processor comprises: Report terminal capability information to the base station to perform initial access, Receive an RRC (Radio Resource Control) configuration message for identifying a candidate beam from the base station, Based on the RRC message, transmit an SRS (Sounding Reference Signal) to the base station, Receive an RRC reset message including configuration information for supporting UL (Uplink) only TRP (Transmission Reception Point) from the base station, A terminal that transmits power information for the candidate beam to the base station through a MAC CE (Medium Access Control Control Element) based on the RRC reset message.

9. In paragraph 8, The terminal capability information includes an indicator indicating whether the terminal supports UL only TRP based uplink transmission.

10. In paragraph 8, The above RRC configuration message includes information about MPE (Maximum Permissible Exposure) resource information and SRS resource information for identifying a candidate beam.

11. In paragraph 8, The terminal, wherein the power information includes power headroom information for the candidate beam and information about power back-off for the candidate beam.

12. In paragraph 8, The terminal, wherein the MAC CE includes identifier information for the candidate beam and an indicator indicating a resource type corresponding to the candidate beam.

13. In paragraph 12, If the indicator indicating the type of resource corresponding to the candidate beam is '0', the resource corresponding to the candidate beam is an MPE resource, A terminal in which the resource corresponding to the candidate beam is an SRS resource when the indicator indicating the type of resource corresponding to the candidate beam is '1'.

14. In paragraph 12, When the indicator indicating the resource type corresponding to the above candidate beam is set to 2 bits, An indicator indicating a type of resource corresponding to the above candidate beam, wherein the resource corresponding to the above candidate beam corresponds to at least one of an NZP-CSI-RS resource, an SSB resource, and an SRS resource.

15. In a method for a base station to perform communication in a wireless communication system, A step of receiving terminal capability information from a terminal to perform an initial access; A step of transmitting an RRC (Radio Resource Control) configuration message to the terminal to identify a candidate beam; A step of receiving an SRS (Sounding Reference Signal) from the terminal based on the RRC message; A step of transmitting an RRC reset message including configuration information for supporting UL (Uplink) only TRP (Transmission Reception Point) to the terminal; and A method comprising: receiving power information for the candidate beam from the terminal through a MAC CE (Medium Access Control Control Element) based on the RRC reset message;

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