Method and apparatus for uplink transmission in cooperative communication network

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method for uplink transmission in a wireless communication system may comprise the operations of: receiving, from a base station, upper layer signaling including information related to a method for determining uplink transmission power related to a plurality of TRPs; transmitting uplink signals to the plurality of TRPs on the basis of the upper layer signaling; receiving, from the base station, signaling indicating an update of information related to the amount of path loss; and on the basis of the signaling, transmitting an uplink for an uplink-only TRP from among the TRPs.

Description

Method and device for uplink transmission in network cooperative communication

[0001] The present disclosure relates to a wireless communication system, and more particularly, to an uplink transmission method that takes path loss into account in network cooperative communication and a device capable of scheduling the same.

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

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

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

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

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

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

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

[0009] The disclosed embodiment relates to an uplink transmission method that takes path loss into account in network cooperative communication and a device capable of scheduling the same.

[0010] The disclosed embodiment relates to a method and apparatus for determining a transmission configuration indicator (TCI) by considering a transmit and receive point (TRP) that supports only uplink reception.

[0011] The disclosed embodiment relates to a method and apparatus for constructing a cell list including cells indicated by a transmission setup indicator.

[0012] The disclosed embodiment relates to a method and apparatus for determining a transmission setup indicator for a cell list including cells that include TRPs that support only uplink reception and cells that include only TRPs that support both uplink and downlink.

[0013] A method for uplink transmission in a wireless communication system according to one embodiment of the present disclosure may include receiving, from a base station, upper layer signaling including information related to a method for determining uplink transmission power associated with a plurality of transmit and receive points (TRPs), transmitting uplink signals to the plurality of TRPs based on the upper layer signaling, receiving, from the base station, signaling instructing update of path loss-related information, and performing uplink transmission for an uplink-only TRP among the TRPs based on the signaling.

[0014] A method for scheduling uplink transmission in a wireless communication system according to one embodiment of the present disclosure may include transmitting, to a terminal, upper layer signaling including information related to a method for determining uplink transmission power associated with a plurality of transmit and receive points (TRPs), receiving uplink signals from the terminal through the plurality of TRPs based on the upper layer signaling, transmitting, to the terminal, signaling instructing update of path loss-related information after receiving the uplink signals, and receiving an uplink signal from the terminal through an uplink-only TRP among the TRPs based on the signaling.

[0015] In a wireless communication system according to one embodiment of the present disclosure, a terminal (UE) performing uplink transmission includes a transceiver and a processor coupled to the transceiver, wherein the processor may be configured to perform an operation of receiving, from a base station, upper layer signaling including information related to a method of determining uplink transmission power associated with a plurality of transmit and receive points (TRPs), an operation of transmitting uplink signals to the plurality of TRPs based on the upper layer signaling, an operation of receiving, from the base station, a signaling instructing update of path loss-related information, and an operation of performing uplink transmission for an uplink-only TRP among the TRPs based on the signaling.

[0016] In a wireless communication system according to one embodiment of the present disclosure, a base station for scheduling uplink transmission includes a transceiver and a processor coupled to the transceiver, wherein the processor may be configured to perform an operation of transmitting, to a terminal, upper layer signaling including information related to a method of determining uplink transmission power associated with a plurality of transmit and receive points (TRPs), an operation of receiving uplink signals from the terminal through the plurality of TRPs based on the upper layer signaling, an operation of transmitting, to the terminal, signaling instructing update of path loss-related information after receiving the uplink signals, and an operation of receiving an uplink signal from the terminal through an uplink-only TRP among the TRPs based on the signaling.

[0017] The disclosed embodiment can effectively provide a service in a mobile communication system.

[0018] The disclosed embodiment can provide an efficient uplink transmission method that takes path loss into account in network cooperative communication.

[0019] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0020] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0021] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0022] FIG. 4a, FIG. 4b, and FIG. 4c are diagrams illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation (CA), and dual connectivity (DC) in a wireless communication system according to one embodiment of the present disclosure.

[0023] FIG. 5A and FIG. 5B are diagrams illustrating beam application times that can be considered when using an integrated transmission configuration indicator (TCI) method in a wireless communication system according to one embodiment of the present disclosure.

[0024] FIG. 6 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or a separate DL or UL TCI state in a wireless communication system according to one embodiment of the present disclosure.

[0025] FIG. 7 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0026] FIG. 8 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0027] FIG. 9A and FIG. 9B are diagrams illustrating a process for beam setting and activation of a physical downlink shared channel (PDSCH) according to one embodiment of the present disclosure.

[0028] FIGS. 10A, 10B, and 10C are diagrams illustrating examples of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0029] FIGS. 11A, 11B, 11C, and 11D are diagrams illustrating examples of downlink control information (DCI) configuration for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0030] FIG. 12 is a diagram illustrating an Enhanced PDSCH TCI state activation / deactivation MAC-CE structure according to one embodiment of the present disclosure.

[0031] FIG. 13 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.

[0032] FIG. 14 is a diagram illustrating a method for calculating and updating a path loss difference value according to one embodiment of the present disclosure.

[0033] FIG. 15 is a diagram illustrating another method for calculating and updating a path loss difference value according to one embodiment of the present disclosure.

[0034] FIG. 16 is a diagram illustrating the operation of a terminal for uplink transmission power control according to one embodiment of the present disclosure.

[0035] FIG. 17 is a diagram illustrating the operation of a base station for uplink transmission power control according to one embodiment of the present disclosure.

[0036] FIG. 18 is a diagram illustrating the operation of a terminal for determining an uplink transmission method according to one embodiment of the present disclosure.

[0037] FIG. 19 is a diagram illustrating the operation of a base station for determining an uplink transmission method according to one embodiment of the present disclosure.

[0038] FIG. 20 is a diagram illustrating a MAC-CE structure for activating and indicating separate DL or UL TCI states based on a unified TCI framework for supporting multiple TRPs according to one embodiment of the present disclosure.

[0039] FIG. 21 is a diagram illustrating a MAC-CE structure for joint TCI state activation and indication based on an integrated TCI framework for multi-TRP support according to one embodiment of the present disclosure.

[0040] FIGS. 22a, 22b, and 22c are diagrams illustrating a MAC-CE structure for separate DL or UL TCI state activation and indication based on a unified TCI framework for supporting multiple TRPs including UL-only TRPs according to one embodiment of the present disclosure.

[0041] FIG. 23 is a diagram illustrating a MAC-CE structure for joint TCI state and UL TCI state activation and indication based on an integrated TCI framework for supporting multiple TRPs including UL-only TRP according to one embodiment of the present disclosure.

[0042] FIG. 24 is a diagram illustrating the operation of a terminal for applying TCI state activation and instructions according to one embodiment of the present disclosure.

[0043] FIG. 25 is a diagram illustrating the operation of a base station for applying TCI state activation and indication according to one embodiment of the present disclosure.

[0044] FIG. 26 is a diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0045] FIG. 27 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0046] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0047] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to ensure that the gist of the present disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0048] 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.

[0049] 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.

[0050] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the embodiments of the present disclosure may be described below using a system based on LTE or LTE-A 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 with 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.

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] As a representative example of the above broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0056] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0057] 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.

[0058] 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.

[0059] Finally, URLLC refers to a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services such as remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and, at the same time, must have a 10 -5The following packet error rate (PER) requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a smaller Transmit Time Interval (TTI) than other services. Simultaneously, design considerations may require the allocation of extensive resources in the frequency band to ensure communication link reliability.

[0060] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the diverse 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.

[0061] Hereinafter, a / b can be understood as at least one of a or b.

[0062] [NR time-frequency resources]

[0063] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0064] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

[0065] The horizontal axis of Figure 1 represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE) (101), which can be defined as 1 OFDM symbol (102) on the time axis and 1 subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can constitute one resource block (RB) (104). One subframe (110) on the time axis can include multiple OFDM symbols (102). For example, the length of one subframe can be 1 ms.

[0066] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0067] Referring to FIG. 2, an example of a structure of a frame (200), a subframe (201), and a slot (202) is illustrated. One frame (200) can be defined as 10 ms. One subframe (201) can be defined as 1 ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( =14). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per 1 subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing.

[0068] In Fig. 2, the cases where μ=0(204) and μ=1(205) are illustrated as the subcarrier spacing setting values. When μ=0(204), 1 subframe (201) can be composed of 1 slot (202), and when μ=1(205), 1 subframe (201) can be composed of 2 slots (203). That is, depending on the setting value μ for the subcarrier spacing, the number of slots per subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Depending on the subcarrier spacing setting μ and can be defined as [Table 1] below.

[0069] [Table 1]

[0070]

[0071] [Bandwidth Part (BWP)]

[0072] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0073] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0074] FIG. 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information in [Table 2] below for each bandwidth portion.

[0075] [Table 2]

[0076]

[0077] Of course, the above example is not limited, and in addition to the above configuration information, various parameters related to the bandwidth portion can be configured for the terminal. The above information can be transmitted from the base station to the terminal via upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth portion among the configured one or more bandwidth portions can be activated. Whether or not the configured bandwidth portion is activated can be semi-statically transmitted from the base station to the terminal via RRC signaling or dynamically transmitted via DCI.

[0078] In some embodiments, a terminal prior to RRC connection may receive an initial bandwidth portion (Initial BWP) for initial access from a base station via a Master Information Block (MIB). More specifically, during the initial access phase, the terminal may receive configuration information regarding a Control Resource Set (CORESET) and a Search Space, where a PDCCH for receiving system information (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)) required for initial access may be transmitted. The Control Space and Search Space configured via the MIB may each be regarded as having an identifier (Identity: ID) of 0.

[0079] The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control area #0 through MIB. In addition, the base station can notify the terminal of configuration information for monitoring cycle and monitoring occasion for control area #0, i.e. configuration information for search space #0, through MIB. The terminal can regard the frequency area set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access. At this time, the identifier (ID) of the initial bandwidth portion can be regarded as 0.

[0080] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0081] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0082] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both a 15 kHz subcarrier spacing and a 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured with the subcarrier spacing may be activated.

[0083] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth (e.g., 100 MHz bandwidth) and constantly transmits and receives data within the bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels with a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, for example, 20 MHz, for the terminal. In a situation where there is no traffic, the terminal may perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it may transmit and receive data in the 100 MHz bandwidth portion according to the instructions of the base station.

[0084] In the method for setting the bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the initial bandwidth portion (Initial BWP) through the MIB during the initial access phase. More specifically, the terminal can set a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive the Physical Downlink Shared Channel (PDSCH) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (Other System Information (OSI), paging, and random access).

[0085] [Bandwidth Part (BWP) Change]

[0086] When one or more bandwidth part values ​​are set for a terminal, the base station can instruct the terminal to change (or switch, transition) the bandwidth part value using the bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently activated bandwidth part of the terminal is bandwidth part #1 (301), the base station can instruct the terminal to bandwidth part #2 (302) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (302) indicated by the bandwidth part indicator in the received DCI.

[0087] As described above, since DCI-based bandwidth part change can be indicated by DCI scheduling physical downlink shared channel (PDSCH) or physical uplink shared channel (PUSCH), when a terminal receives a bandwidth part change request, it must be able to perform reception or transmission of PDSCH or PUSCH scheduled by the DCI without difficulty in the changed bandwidth part. To this end, the standard specifies the delay time (T) required when changing the bandwidth part. BWP ) and can be defined as in [Table 3] below, for example.

[0088] [Table 3]

[0089]

[0090] The bandwidth-partial change delay time requirement supports Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth-partial delay time type to the base station.

[0091] According to the requirement for the bandwidth part change delay time described above, when the terminal receives DCI including the bandwidth part change indicator in slot n, the terminal can complete the change to the new bandwidth part indicated by the bandwidth part change indicator at a time not later than slot n+TBWP, and can perform transmission and reception for the data channel (e.g., PUSCH or PDSCH) scheduled by the DCI in the changed new bandwidth part.

[0092] When a base station wants to schedule a data channel in a new bandwidth portion, it can determine the time domain resource allocation for the data channel by considering the bandwidth portion change delay time (TBWP) of the terminal. That is, when scheduling a data channel in a new bandwidth portion, the base station can schedule the data channel after the bandwidth portion change delay time in the method of determining the time domain resource allocation for the data channel. Accordingly, the terminal may not expect the DCI indicating the bandwidth portion change to indicate a slot offset (K0 or K2) value smaller than the bandwidth portion change delay time (TBWP).

[0093] If the terminal receives DCI (e.g., DCI format 1_1 or 0_1) indicating a bandwidth change, the terminal may not perform any transmission or reception during the time period corresponding to the third symbol of the slot in which the PDCCH including the DCI is received, to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the terminal receives DCI indicating a bandwidth change in slot n and the slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the previous symbol of slot n+K (i.e., the last symbol of slot n+K-1).

[0094] [CA / DC related]

[0095] FIGS. 4A, 4B, and 4C are diagrams illustrating a wireless protocol structure of a base station and a terminal in a single cell, carrier aggregation (CA), and dual connectivity (DC) according to one embodiment of the present disclosure.

[0096] Referring to FIGS. 4a, 4b, and 4c, the wireless protocol of the next-generation mobile communication system is composed of NR SDAP (Service Data Adaptation Protocol) (425, 470), NR PDCP (Packet Data Convergence Protocol) (430, 465), NR RLC (Radio Link Control) (435, 460), and NR MAC (Medium Access Control) (440, 455) in the terminal and the NR base station, respectively.

[0097] The main functions of NR SDAP (425, 470) may include at least some of the following functions:

[0098] - Transfer of user plane data

[0099] - Mapping function between QoS flow and data bearer for both DL and UL

[0100] - Marking function of QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0101] - Ability to map reflective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0102] For the above SDAP layer device, the terminal can be configured by an RRC message for each PDCP layer device, each bearer, or each logical channel, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device, and when the SDAP header is configured, the terminal can instruct the NAS QoS reflection configuration 1-bit indicator (NAS reflective QoS) and the AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header to update or reset the mapping information for the QoS flow and data bearer of the uplink and downlink. The SDAP header can include QoS flow ID information indicating QoS. The QoS information can be used as data processing priority, scheduling information, etc. to support a smooth service.

[0103] The main functions of NR PDCP (430, 465) may include at least some of the following functions:

[0104] - Header compression and decompression (ROHC only)

[0105] - User data transfer function

[0106] - In-sequence delivery of upper layer PDUs

[0107] - Out-of-sequence delivery of upper layer PDUs

[0108] - PDCP PDU reordering for reception

[0109] - Duplicate detection of lower layer SDUs

[0110] - Retransmission function (Retransmission of PDCP SDUs)

[0111] - Encryption and decryption functions (Ciphering and deciphering)

[0112] - Timer-based SDU discard in uplink.

[0113] The reordering function of the NR PDCP device above refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order. Alternatively, the reordering function of the NR PDCP device may include a function of transmitting data directly without considering the order, a function of recording lost PDCP PDUs by reordering the order, a function of reporting a status of lost PDCP PDUs to the transmitting side, and a function of requesting retransmission of lost PDCP PDUs.

[0114] The main functions of NR RLC (435, 460) may include at least some of the following functions:

[0115] - Data transfer function (Transfer of upper layer PDUs)

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

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

[0118] - ARQ function (Error Correction through ARQ)

[0119] - Concatenation, segmentation and reassembly of RLC SDUs

[0120] - Re-segmentation of RLC data PDUs

[0121] - Reordering of RLC data PDUs

[0122] - Duplicate detection function

[0123] - Protocol error detection

[0124] - RLC SDU discard function

[0125] - RLC re-establishment function

[0126] In the above, the in-sequence delivery function of the NR RLC device refers to the function of sequentially delivering RLC SDUs received from a lower layer to an upper layer. The in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering a single RLC SDU when it is received divided into multiple RLC SDUs, a function of rearranging received RLC PDUs based on the RLC SN (sequence number) or PDCP SN (sequence number), a function of recording lost RLC PDUs by rearranging the order, a function of reporting the status of lost RLC PDUs to the transmitting side, and a function of requesting retransmission of lost RLC PDUs.

[0127] The in-sequence delivery function of an NR RLC device may include a function to sequentially deliver to the upper layer only the RLC SDUs up to the lost RLC SDU when there is a lost RLC SDU, or may include a function to sequentially deliver to the upper layer all RLC SDUs received before the timer starts if a predetermined timer has expired even if there is a lost RLC SDU. Alternatively, the in-sequence delivery function of an NR RLC device may include a function to sequentially deliver to the upper layer all RLC SDUs received up to the present if a predetermined timer has expired even if there is a lost RLC SDU.

[0128] In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the order of the sequence number) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, the segments stored in the buffer or to be received later may be received, reconstructed into a complete RLC PDU, processed, and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

[0129] The out-of-sequence delivery function of the NR RLC device above refers to the function of directly delivering RLC SDUs received from a lower layer to an upper layer regardless of the order, and may include a function of reassembling and delivering RLC SDUs when one RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing and arranging the RLC SN or PDCP SN of received RLC PDUs to record lost RLC PDUs.

[0130] NR MAC (440, 455) can be connected to multiple NR RLC layer devices configured in one terminal, and the main function of NR MAC can include at least some of the following functions.

[0131] - Mapping function (Mapping between logical channels and transport channels)

[0132] - Multiplexing / demultiplexing of MAC SDUs

[0133] - Scheduling information reporting function

[0134] - HARQ function (Error correction through HARQ)

[0135] - Priority handling between logical channels of one UE

[0136] - Priority handling between UEs by means of dynamic scheduling

[0137] - MBMS service identification function

[0138] - Transport format selection function

[0139] - Padding function

[0140] The NR PHY layer (445, 450) can perform operations of channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it through a wireless channel, or demodulating and channel decoding OFDM symbols received through a wireless channel and transmitting them to a higher layer.

[0141] The above wireless protocol structure may have various detailed structures depending on the carrier (or cell) operation method.

[0142] Referring to FIG. 4a, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal use a protocol structure (400) having a single structure for each layer.

[0143] Referring to FIG. 4b, when a base station transmits data to a terminal based on carrier aggregation (CA) using multiple carriers in a single TRP, the base station and the terminal use a protocol structure (410) that multiplexes SDAP, PDCP, and RLC into multiple PHY layers through a MAC layer.

[0144] Referring to FIG. 4c, when a base station transmits data to a terminal based on DC (dual connectivity) using multiple carriers in multiple TRPs, the base station and the terminal use a protocol structure (420) that multiplexes SDAP and PDCP into multiple lower layers (e.g., RLC, MAC, and PHY layers).

[0145] [Unified TCI (transmission configuration indicator) state]

[0146] Hereinafter, a single TCI state indication and activation method based on the unified TCI scheme is described. The unified TCI scheme may refer to a method of integrating and managing the transmission and reception beam management methods, which were distinguished into the TCI state method used in downlink reception of the terminal and the spatial relation info method used in uplink transmission in the existing Rel-15 and 16, 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 having the tci-stateId-r17, which is an upper layer signaling, from the base station, the terminal can perform an operation based on the unified TCI scheme using the TCI-State. The TCI-State can exist in two forms: a joint TCI state or a separate TCI state.

[0147] The first type is a joint TCI state, and the terminal can be instructed by the base station about both the TCI state to be applied to uplink transmission and downlink reception through a single TCI-State. If the terminal is instructed about a TCI-State based on the joint TCI state, the terminal can be instructed about parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 in the joint TCI-state based TCI-State, and parameters to be used as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2. If the terminal is instructed about a TCI-State based on the joint TCI state, the terminal can be instructed about parameters to be used as an uplink transmission beam or transmission filter using the RS corresponding to qcl-Type2 in the joint DL / UL TCI-state based TCI-State. If the terminal is instructed about a joint TCI state, the terminal can apply the same beam to both uplink transmission and downlink reception.

[0148] The second form is a separate TCI state, and the terminal can be individually instructed by the base station to use the UL TCI state to apply to uplink transmission and the DL TCI state to apply to downlink reception. If the terminal is instructed to use the UL TCI state, the terminal can be instructed to use the parameters to use as the uplink transmission beam or transmission filter using the reference RS or source RS set in the UL TCI state. If the terminal is instructed to use the DL TCI state, the terminal can be instructed to use the parameters to use for downlink channel estimation using the RS corresponding to qcl-Type1 set in the DL TCI state, and the parameters to use as the downlink reception beam or reception filter using the RS corresponding to qcl-Type2.

[0149] 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 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 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. 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.

[0150] 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 UE 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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, and there may be two methods of transmission / reception beam instructions from the base station: a MAC-CE-based instruction method and a MAC-CE-based activation and DCI-based instruction method.

[0155] 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.

[0156] If the number of joint TCI states included in the MAC-CE is one, the terminal can determine the uplink transmission beam or transmission filter and the downlink reception beam or reception filter using the indicated joint TCI state starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. If the number of joint TCI states included in the MAC-CE is two or more, the terminal can confirm that the plurality of 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 from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful, and can activate the indicated joint TCI state.

[0157] Afterwards, the terminal can receive DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the DCI to the uplink transmission and downlink reception beams. 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).

[0158] If a terminal receives transmission / reception beam-related instructions using a separate TCI state method through upper layer signaling, the terminal can perform transmission / reception beam application operations 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 MAC-CE to the terminal through a PDCCH.

[0159] If there is one separate TCI state set included in the MAC-CE, the terminal can determine an uplink transmission beam or transmission filter and a downlink reception beam or reception 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 PDSCH was successful. A separate TCI state set may mean one or multiple separate TCI states that one code point of a TCI state field in DCI format 1_1 or 1_2 may 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 terminal can 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 3 ms after transmitting the PUCCH including HARQ-ACK information indicating whether reception of the PDSCH was successful or not, and activate the indicated separate TCI state sets.

[0160] 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. A terminal may receive DCI format 1_1 or 1_2 and apply a separate set of TCI states indicated by the TCI state field in the DCI to the uplink transmission and downlink reception beams. 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).

[0161] FIG. 5A and FIG. 5B are diagrams illustrating beam application times that can 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, which includes (with DL assignment) or does not include (without DL assignment) downlink data channel scheduling information, and apply one joint TCI state or a separate set of TCI states indicated by the TCI state field in the DCI to uplink transmission and downlink reception beams.

[0162] Figure 5a illustrates DCI format 1_1 or 1_2 with DL assignment (500). If a terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from a base station and indicates one joint TCI state or a separate TCI state set based on an integrated TCI scheme (501), the terminal receives a PDSCH scheduled based on the received DCI (505), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH was successful (510). 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.

[0163] Figure 5b describes DCI format 1_1 or 1_2 without DL assignment (550). If a terminal receives DCI format 1_1 or 1_2 from a base station that does not include downlink data channel scheduling information (555) and indicates one joint TCI state or a set of separate TCI states based on the integrated TCI method, the terminal may assume at least one combination of the following for the DCI.

[0164] ■ Includes scrambled CRC using CS-RNTI.

[0165] ■ The value of all bits assigned to all fields used as RV (Redundancy Version) fields is 1.

[0166] ■ The value of all bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields is 1.

[0167] ■ The value of all bits assigned to all fields used as NDI (New Data Indication) fields is 0.

[0168] ■ For FDRA (Frequency Domain Resource Allocation) Type 0, the value of all bits allocated to the FDRA field is 0, for FDRA Type 1, the value of all bits allocated to the FDRA field is 1, and when the FDRA method is dynamicSwitch, the value of all bits allocated to the FDRA field is 0.

[0169] The terminal can transmit a PUCCH including a HARQ-ACK indicating whether reception was successful for the DCI format 1_1 or 1_2 for which the above-described matters are assumed (560).

[0170] - For both DCI format 1_1 or 1_2 with DL assignment (500) and without DL assignment (550), if a new TCI state indicated through DCI (501, 555) is the same as a TCI state that has already been indicated and applied to an uplink transmission and downlink reception beam, the terminal may maintain the previously applied TCI state, and if the new TCI state is different from the previously indicated TCI state, the terminal 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 a slot (530, 580) after the first slot (520, 570) after a time equal to the beam application time (BAT) (515, 565) after the PUCCH transmission, and may use the previously indicated TCI-state up to the slot (525 575) preceding the slot (520, 570).

[0171] - For both DCI format 1_1 or 1_2 with DL assignment (500) and without DL assignment (550), the BAT can be set by upper layer signaling based on terminal capability report information as a specific number of OFDM symbols, and the numerology for the BAT and the first slot after the BAT can be determined based on the smallest numerology among all cells to which the joint TCI state or separate TCI state set indicated through the DCI is applied.

[0172] A terminal can apply one joint TCI state indicated through 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.

[0173] 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.

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

[0175] 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 connected to 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.

[0176] [Unified TCI state MAC-CE]

[0177] 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 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.

[0178] FIG. 6 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or separate DL or UL TCI state in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 6, the meaning of each field within the MAC-CE structure may be as follows.

[0179] - Serving Cell ID (600): This field can indicate which serving cell the MAC-CE is applied to. The length of this field can be 5 bits. If the serving cell indicated by this field is included in one or more of the upper layer signaling simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, and simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0180] - DL BWP ID (605): This field can indicate to which DL BWP the MAC-CE applies, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0181] - UL BWP ID (610): This field can indicate to which UL BWP the MAC-CE applies, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0182] - Pi (615): This field can indicate whether each code point in the TCI state field in DCI format 1_1 or 1_2 has multiple TCI states or a single TCI state. If the value of Pi is 1, it means that the corresponding ith code point has multiple TCI states, which may mean that the corresponding code point may include a separate DL TCI state and a separate UL TCI state. If the value of Pi is 0, it means that the corresponding ith code point has a single TCI state, which may mean that the corresponding code point may include either a joint TCI state, a separate DCI TCI state, or a separate UL TCI state.

[0183] - D / U (620): This field can indicate whether the TCI state ID field in the same octet is a joint TCI state, a separate DL TCI state, or a separate UL TCI state. If this field is 1, the TCI state ID field in the same octet can be a joint TCI state or a separate DL TCI state, and if this field is 0, the TCI state ID field in the same octet can be a separate UL TCI state.

[0184] - TCI state ID (625): This field can indicate a TCI state that can be identified by the upper layer signaling TCI-StateId. If the D / U field is set to 1, this field can be used to express the TCI-StateId, which can be expressed in 7 bits. If the D / U field is set to 0, the MSB (most significant bit) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the upper layer signaling UL-TCIState-Id. The maximum number of TCI states that can be activated can be 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0185] - R: Indicates reserved bit and can be set to 0.

[0186] For the MAC-CE structure of FIG. 6 described above, the terminal may include the third octet including the P1, P2, ..., P8 fields in FIG. 6 in the MAC-CE structure, regardless of whether unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint or separate. In this case, the terminal may perform TCI state activation using a fixed MAC-CE structure regardless of the upper layer signaling set by the base station.

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

[0188] [PDCCH: DCI related]

[0189] Next, we will specifically explain downlink control information (DCI) in 5G systems.

[0190] In a 5G system, scheduling information for uplink data (e.g., physical uplink shared channel (PUSCH)) or downlink data (e.g., 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.

[0191] 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.

[0192] 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).

[0193] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, and 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 4] below.

[0194] [Table 4]

[0195]

[0196] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, and 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 5] below.

[0197] [Table 5]

[0198]

[0199]

[0200]

[0201] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, and 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 6] below.

[0202] [Table 6]

[0203]

[0204] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, and 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 7] below.

[0205] [Table 7]

[0206]

[0207]

[0208] [PDCCH: CORESET, REG, CCE, Search Space]

[0209] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0210] FIG. 7 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system. Referring to FIG. 7, an example is illustrated in which multiple control regions (e.g., Control Region #1 (701), Control Region #2 (702)) are set within a UE bandwidth part (710) on the frequency axis and within one slot (720) on the time axis. The control regions (701, 702) may be set to specific frequency resources (703) within the entire UE bandwidth part (710) on the frequency axis. The time axis may be set to one or more OFDM symbols, which may be defined as the control region length (Control Resource Set Duration) (704). Referring to the illustrated example, Control Region #1 (701) is set to a control region length of two symbols, and Control Region #2 (702) is set to a control region length of one symbol.

[0211] 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), and / or 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 8] below.

[0212] [Table 8]

[0213]

[0214] In [Table 8], 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.

[0215] FIG. 8 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in 5G according to one embodiment of the present disclosure. Referring to FIG. 8, the basic unit of time and frequency resources that constitute a control channel may be a Resource Element Group (REG) (803), and a REG (803) may be defined as 1 OFDM symbol (801) on the time axis and 1 Physical Resource Block (PRB) (802) on the frequency axis, i.e., 12 subcarriers. A base station may concatenate REGs (803) to constitute a downlink control channel allocation unit.

[0216] When the basic unit to which a downlink control channel is allocated in 5G is called a Control Channel Element (CCE) (804), 1 CCE (804) can be composed of multiple REGs (803). A REG (803) can be composed of 12 REs, and if 1 CCE (804) is composed of 6 REGs (803), 1 CCE (804) can be composed of 72 REs. When a downlink control region is established, the downlink control region can be composed of multiple CCEs (804), and the downlink control channel can be mapped to one or multiple CCEs (804) and transmitted according to the aggregation level (AL) within the control region. The CCEs (804) within the control region are distinguished by numbers, and the numbers of the CCEs (804) can be assigned according to a logical mapping method.

[0217] A basic unit of a downlink control channel (e.g., REG (803)) may include an area where REs to which DCI is mapped and DMRS (805), which is a reference signal for decoding the REs, are mapped. In one embodiment, three DMRSs (805) may be transmitted within one REG (803). The number of CCEs required to transmit a 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.

[0218] For example, when AL=L, a single downlink control channel can be transmitted through L CCEs. The terminal must detect a signal without knowing information about the downlink control channel, and a search space representing a set of CCEs for blind decoding is defined. The search space is a set of downlink control channel candidates consisting of CCEs that the terminal must attempt to decode at a given aggregation level, and since there are various aggregation levels that create a single bundle with 1, 2, 4, 8, and 16 CCEs, the terminal can have multiple search spaces. A search space set can be defined as a set of search spaces at all configured aggregation levels.

[0219] 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.

[0220] In 5G, parameters for the search space for PDCCH can be configured from the base station to the terminal via higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the information in [Table 9] below can be included.

[0221] [Table 9]

[0222]

[0223]

[0224] 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.

[0225] 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.

[0226] 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.

[0227] - 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

[0228] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0229] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0230] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0231] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0232] 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.

[0233] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0234] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0235] The RNTIs specified may follow the definitions and uses below.

[0236] - C-RNTI (Cell RNTI): Terminal-specific PDSCH scheduling

[0237] - TC-RNTI (Temporary Cell RNTI): Terminal-specific PDSCH scheduling

[0238] - CS-RNTI (Configured Scheduling RNTI): Semi-statically configured terminal-specific PDSCH scheduling

[0239] - RA-RNTI (Random Access RNTI): PDSCH scheduling in the random access phase

[0240] - P-RNTI (Paging RNTI): PDSCH scheduling where paging is transmitted

[0241] - SI-RNTI (System Information RNTI): PDSCH scheduling where system information is transmitted.

[0242] - INT-RNTI (Interruption RNTI): Indicates whether pucturing is taking place on the PDSCH.

[0243] - TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Power control command for PUSCH

[0244] - TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Power control command for PUCCH

[0245] - TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Power control command for SRS (sounding reference signal)

[0246] The aforementioned specified DCI formats may follow the definitions in [Table 10] below.

[0247] [Table 10]

[0248]

[0249] 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.

[0250] [Mathematical Formula 1]

[0251]

[0252]

[0253] In 5G, since multiple search space sets can be configured with different parameters (e.g., parameters in [Table 9]), the set of search space sets monitored by a terminal at each point in time can be different. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific slot, or can monitor either search space set #1 or search space set #2 in a specific slot.

[0254] [PUCCH: Transmission Related]

[0255] 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: a HARQ-ACK indicating whether demodulation / decoding was successful for a TB (transport block) received by the terminal via the PDSCH; a scheduling request (SR) requesting resource allocation from the PUSCH base station for uplink data transmission by the terminal; and channel state information (CSI), which is information for reporting the channel status of the terminal.

[0256] 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 have a length of four or more symbols within a slot, while short PUCCHs have a length of two or fewer symbols within a slot.

[0257] 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.

[0258] 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.

[0259] 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, w) in the time axis in a sequence corresponding to the length of 1 RB in the frequency axis within one OFDM symbol. i (m)) can be spread and transmitted after performing IFFT.

[0260] 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, w) to the scrambled sequence in the time axis. i (m))) can be used to spread the signal and then transmitted after performing IFFT.

[0261] 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.

[0262] w i (m) is the length of the spreading code (NSF) given is determined as follows, for example, spreading code for PUCCH format 1 is given as in [Table 11] 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] mean Phi(m), and 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 wi(m) is , This is w i (m)=

[0011] .

[0263] [Table 11]

[0264]

[0265] 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. In PUCCH format 3, DMRS symbol locations are presented in [Table 12] below, depending on whether frequency hopping occurs within a slot and whether additional DMRS symbols are configured.

[0266] [Table 12]

[0267]

[0268] For example, if the number of transmission symbols of PUCCH format 3 is 8 symbols, DMRS is transmitted in the 1st and 5th symbols, starting with the first start symbol of the 8 symbols as 0. [Table 12] is applied in the same way to the DMRS symbol positions of PUCCH format 4.

[0269] 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. 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 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.

[0270] 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.

[0271] 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 setting 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.

[0272] 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 13] 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.

[0273] [Table 13]

[0274]

[0275] 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 14] 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.

[0276] [Table 14]

[0277]

[0278] 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 in PUCCH format 2 within one OFDM symbol 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.

[0279] In summary, the values ​​and ranges that can be set for each PUCCH format described above can be summarized as shown in [Table 15] below. In [Table 15] below, values ​​that do not need to be set are indicated as NA.

[0280] [Table 15]

[0281]

[0282]

[0283] 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 upper layer signaling nrofSlots. For repeated PUCCH transmissions, PUCCH transmissions in each slot are performed using the same number of consecutive symbols, and the number of corresponding consecutive symbols can be configured through nrofSymbols in the upper layer signaling PUCCH-format1, PUCCH-format3, or PUCCH-format4.

[0284] For PUCCH repeated transmission, PUCCH transmission in each slot is performed using the same starting symbol, and the corresponding starting symbol can be set through startingSymbolIndex in PUCCH-format 1, PUCCH-format 3, or PUCCH-format 4, which is a higher layer signaling. For PUCCH repeated transmission, a single PUCCH-spatialRelationInfo can be set for a single PUCCH resource. For PUCCH repeated transmission, if the terminal is configured to perform frequency hopping in PUCCH transmissions in different slots, the terminal can perform frequency hopping on a slot-by-slot basis.

[0285] Additionally, if the terminal is configured to perform frequency hopping in PUCCH transmissions in different slots, the terminal may start PUCCH transmission from the first PRB index configured through the upper layer signaling startingPRB in even slots, and may start PUCCH transmission from the second PRB index configured through the upper 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 PUCCH repetition transmission count value may increase regardless of the PUCCH transmission performed in each slot during the configured total number of PUCCH repetition transmissions.

[0286] If the terminal is configured to perform frequency hopping in PUCCH transmissions in different slots, the terminal does not expect frequency hopping within the 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 the slot, the first and second PRB indices can 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. If the terminal fails to transmit the PUCCH in a slot for some reason during repeated PUCCH transmission, the terminal may increase the number of repeated PUCCH transmissions.

[0287] 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.

[0288] [PUCCH: Transmission Power Related]

[0289] 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 Expression 2] below, which is expressed in units of dBm. In [Mathematical Expression 2] below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be set for the primary cell c, the carrier frequency f, and the bandwidth part b, and can be distinguished by the indices b, f, and c.

[0290] [Equation 2]

[0291]

[0292] - P CMAX,f,c (i): 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.

[0293] - P 0_PUCCH,b,f,c (q u ): P 0_PUCCH,b,f,c (q u ) is P 0_NOMINAL_PUCCH Wow P 0_UE_PUCCH (q u ) can be composed of the sum of P 0_NOMINAL_PUCCH is set via p0-nominal, a Cell Specific upper layer signaling with a cell-specific value, and if there is no setting, P 0_NOMINAL_PUCCH can be 0 dBm. P 0_UE_PUCCH (q u) 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, and q u is greater than or equal to 0 and Q u It can be a smaller value than Q u is P 0_UE_PUCCH It can mean the size of the set of values ​​and can be set via the upper layer signaling maxNrofPUCCH-P0-PerSet. P 0_UE_PUCCH A set of values ​​can be set via the upper layer signaling p0-Set, and if there is no such set, P 0_UE_PUCCH (q u ) can be considered as 0.

[0294] - μ: Subcarrier spacing configuration value

[0295] - : 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).

[0296] - PL b,f,c (q d ): Path loss between the base station and the terminal, the terminal uses the reference signal (RS; Reference Signal) resource q signaled by the base station. d Path loss is calculated from the difference between the transmission power and the terminal reception signal level of the reference signal.

[0297] - Δ F_PUCCH(F): For PUCCH format 0, if the upper layer signaling deltaF-PUCCH-f0 is set, the set value is used. For PUCCH format 1, if the upper layer signaling deltaF-PUCCH-f1 is set, the set value is used. For PUCCH format 2, if the upper layer signaling deltaF-PUCCH-f2 is set, the set value is used. For PUCCH format 3, if the upper layer signaling deltaF-PUCCH-f3 is set, the set value is used. For PUCCH format 4, if the upper layer signaling deltaF-PUCCH-f4 is set, the corresponding value can be used. For all PUCCH formats, if the upper layer signaling is not set, 0 can be used.

[0298] - Δ TF,b,f,c (i): 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.

[0299] - g b,f,c (i,l): This may refer to 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.

[0300] PUCCH power control adjustment state g b,f,c (i,l) can be determined through the bandwidth part b, carrier frequency f, primary cell c, ith transmission unit, and closed loop index l.

[0301] - δPUCCH,b,f,c(i,l): 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 and PDSCH reception corresponding to the closed loop index l 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.

[0302] o 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.

[0303] o 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.

[0304] o If the terminal obtains a TPC command value through a TPC command field included in DCI format 1_0, 1_1, or 1_2 that schedules PDSCH reception, and the terminal has been configured with PUCCH-SpatialRelationInfo, which is an upper layer signaling, the terminal can obtain a link 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.

[0305] o If the terminal obtains one TPC command value from the TPC command field included in the DCI format 2_2 transmitted 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.

[0306] Within bandwidth part b, carrier frequency f, and primary cell c, PUCCH power control adjustment state g for the i-th PUCCH transmission unit corresponding to closed loop index l b,f,c (i,l) can be calculated as in [Mathematical Formula 3].

[0307] [Equation 3]

[0308]

[0309] o δPUCCH,b,f,c(m,l) may be a value indicated by a TPC command field included in 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, the carrier frequency f and the primary cell c as described above, or may be a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUCCH-RNTI. When TPC command accumulation operation is possible, the δPUCCH,b,f,c value may have a corresponding value in [dB] depending on which value the TPC command field included in DCI format 1_0, 1_1, 1_2 or 2_2 is indicated with, as shown in [Table 18]. For example, if the value of the TPC command field is 0, δPUCCH,b,f,c may have a value of -1 dB.

[0310] o is a specific set C of TPC command values ​​described above.i It can mean the sum of δPUCCH,b,f,c for all transmission units corresponding to it. c(C i ) is a set C i It can mean the number of all elements belonging to C i may mean a set of DCIs containing all TPC command values ​​for performing TPC command accumulation operation for the i-th PUCCH transmission unit. C i 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 as C. i can be included as an element of .

[0311] ● C i The end point for determining is K from the start symbol of the i-th PUCCH transmission unit. PUCCH (i) It can be a point as far back as the symbol.

[0312] ● C i The starting point for determining is K from the starting symbol of the i - i0th PUCCH transmission unit. PUCCH It can be a point that is as far back as (i-i0)-1 symbols. i0, a positive integer, is the C above. i The end point for determining (K from the start symbol of the i-th PUCCH transmission unit) PUCCH (i) from the starting symbol of the i - i0th PUCCH transmission unit, K PUCCH It can be determined as the smallest value that satisfies that the time point that is earlier than (i-i0) symbols becomes an earlier time point in time.

[0313] ● For example, C i The end point for determining can be defined as sym(i), and K is defined as the starting symbol of the i - i0th PUCCH transmission unit. PUCCHIf the time point prior to (i-i0) symbols 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.

[0314] [PUSCH: Transmission method related]

[0315] 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.

[0316] Configured grant Type 1 PUSCH transmissions can be semi-statically scheduled by receiving configuredGrantConfig containing rrc-ConfiguredUplinkGrant of [Table 16] via higher-level signaling, without receiving UL grants in DCI. Configured grant Type 2 PUSCH transmissions can be semi-persistently scheduled by UL grants in DCI after receiving configuredGrantConfig not containing rrc-ConfiguredUplinkGrant of [Table 16] via higher-level signaling.

[0317] When PUSCH transmission operates by configured grant, parameters applied to PUSCH transmission are applied through configuredGrantConfig, which is an upper signaling of [Table 16], except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by pusch-Config, which is an upper signaling of [Table 17]. If the terminal has been provided with transformPrecoder in configuredGrantConfig, which is an upper signaling of [Table 16], the terminal applies tp-pi2BPSK in pusch-Config of [Table 17] for PUSCH transmission operated by configured grant.

[0318] [Table 16]

[0319]

[0320]

[0321] Next, the PUSCH transmission method is described. The DMRS antenna port for PUSCH transmission is the same as the antenna port for SRS transmission. PUSCH transmission can follow a codebook-based or non-codebook-based transmission method, respectively, depending on whether the value of txConfig in the upper signaling, pusch-Config in [Table 17], is 'codebook' or 'nonCodebook'.

[0322] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically set 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.

[0323] 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 receive txConfig in pusch-Config of [Table 17], the UE does not expect scheduling via DCI format 0_1.

[0324] [Table 17]

[0325]

[0326] 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).

[0327] SRI can be given through the SRS resource indicator field in DCI or can be set through the upper signaling srs-ResourceIndicator. When transmitting a codebook-based PUSCH, the UE is set with at least one SRS resource, and can be set with up to two. When the UE receives the SRI through 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.

[0328] The TPMI and transmission rank can be provided through the 'precoding information and number of layers' field in the DCI, or can be configured through the higher-level signaling precodingAndNumberOfLayers. The TPMI is used to indicate the precoder to be applied to 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 SRS resource. If the UE is configured with multiple SRS resources, the TPMI is used to indicate the precoder to be applied to the SRS resource indicated by the SRI.

[0329] 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'.

[0330] 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'.

[0331] 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.

[0332] 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. 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 a 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.

[0333] 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.

[0334] 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 on the precoder for SRS transmission to be updated.

[0335] 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. 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 field SRS request in DCI format 0_1 ​​or 1_1 is not '00'. The DCI (e.g., DCI format 0_1 ​​or 1_1) 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. The TCI states set for the scheduled subcarriers are not set to QCL-TypeD.

[0336] 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.

[0337] 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. The SRI can be indicated through the SRS resource indicator field in the DCI or can be configured through the srs-ResourceIndicator, which is a higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the UE to the base station. SRS resources transmitted simultaneously by the UE 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.

[0338] 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. 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. 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.

[0339] [PUSCH: Transmission Power Related]

[0340] In one embodiment of the present disclosure, when uplink data is transmitted through a physical uplink shared channel (PUSCH) in response to a power control command received from a base station, a method for transmitting by setting the transmission power of the physical uplink shared channel by a terminal is described. The transmission power of the physical uplink shared channel 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, 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.

[0341] [Equation 4]

[0342]

[0343] - P CMAX,f,c (i): 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.

[0344] - P 0_PUSCH,b,f,c (j): P 0_PUSCH,b,f,c (j) is P 0_NOMINAL_PUSCH,f,c (j) and P 0_UE_PUSCH,b,f,c It consists of the sum of (j). P 0_NOMINAL_PUSCH,f,c (j) is set to cell-specific upper layer signaling to the terminal, and P 0_UE_PUSCH,b,f,c(j) 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.

[0345] - μ: Subcarrier spacing configuration value

[0346] - : 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).

[0347] - α b,f,c (j): This refers to a value that can be determined (in case of dynamic grant PUSCH) through upper layer settings and SRI (SRS Resource Indicator) as a value to compensate for path loss.

[0348] - PL b,f,c (q d ): Path loss between the base station and the terminal, the terminal uses the reference signal (RS; Reference Signal) resource q signaled by the base station. d 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 q. d It means the downlink path loss estimate estimated by the terminal through the reference signal, and the reference signal index q. dThe 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.

[0349] - Δ TF,b,f,c (i): This refers to a value determined according to the MCS (Modulation Coding Scheme) and the format (TF: transport format) of information transmitted via PUSCH (e.g., whether UL-SCH is included or CSI is included, etc.).

[0350] - f b,f,c (i,l): This refers to a value for the closed loop index l, which 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.

[0351] PUSCH power control adjustment state f b,f,c (i,l) can be determined through the bandwidth part b, carrier frequency f, cell c, i-th transmission unit, and closed loop index l.

[0352] - δPUSCH,b,f,c(i,l): 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 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.

[0353] o If the terminal has received the upper layer signaling twoPUSCH-PC-AdjustmentStates, the closed loop index l can have the value 0 or 1.

[0354] o 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.

[0355] ● If the terminal has set ConfiguredGrantConfig, which is a higher layer signaling, and performs PUSCH transmission or retransmission, the closed loop index l can follow the powerControlLoopToUse value, which is a higher layer signaling.

[0356] ● If the terminal has been configured with SRI-PUSCH-PowerControl, which is an upper layer signaling, the terminal can obtain a connection relationship between the value indicated by the SRI (SRS resource indicator) field in the DCI format that schedules PUSCH transmission and the closed loop index l configured through sri-PUSCH-ClosedLoopIndex, which is an upper 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 connection relationship.

[0357] ● 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.

[0358] ● If the terminal is indicated with a TPC command value through a TPC command field included in DCI format 2_2 transmitted 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.

[0359] - 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 f 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 b,f,c (i,l) can be calculated as in [Equation 5].

[0360] [Equation 5]

[0361]

[0362] o δPUSCH,b,f,c(m,l) may be a value indicated by a 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 as described above, or may be a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI. When TPC command accumulation operation is possible, the δPUSCH,b,f,c value may have a corresponding value in [dB] depending on which value the TPC command field included in DCI format 0_0, 0_1, 0_2, or 2_2 is indicated with, as shown in [Table 18] below. For example, if the value of the TPC command field is 0, δPUSCH,b,f,c may have a value of -1 dB.

[0363] o is a specific set of TPC command values ​​described above D i It can mean the sum of the δPUSCH,b,f,c values ​​for all transmission units corresponding to it. In this case, c(D i ) is a set D i It can mean the number of all elements belonging to D i may mean a set of DCIs containing all TPC command values ​​for which TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. D i To determine the start and end points in the time dimension, all DCIs received by the terminal within the two points are defined as D. i can be included as an element of .

[0364] ● D i The end point for determining is K from the start symbol of the i-th PUSCH transmission unit. PUSCH(i) It can be a point as far back as the symbol.

[0365] ● D i The starting point for determining is K from the starting symbol of the i-i0th PUSCH transmission unit. PUSCH It can be a point that is as far back as (i-i0)-1 symbols. i0, a positive integer, is the D i The end point for determining (K from the start symbol of the i-th PUSCH transmission unit) PUSCH (i) from the starting symbol of the i-i0th PUSCH transmission unit, K PUSCH It can be determined as the smallest value that satisfies that the previous time point becomes an earlier time point in time by (i-i0) symbols.

[0366] ● For example, D i The end point for determining can be defined as sym(i), and K is defined as the starting symbol of the i-i0th PUSCH transmission unit. PUSCH If the time point prior to (i-i0) symbols 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.

[0367] - 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 f 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 b,f,c (i,l) can be calculated as in [Equation 6].

[0368] [Equation 6]

[0369]

[0370] o δPUSCH,b,f,c(i,l) may be 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 as described above, or may be a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI. When TPC command accumulation operation is impossible, the δPUSCH,b,f,c value may have a corresponding value in [dB] depending on which value the TPC command field included in DCI format 0_0, 0_1, 0_2, or 2_2 is indicated with, as shown in [Table 18] below. For example, if the value of the TPC command field is 0, δPUSCH,b,f,c may have a value of -4 dB.

[0371] [Table 18]

[0372]

[0373] [SRS related]

[0374] 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.

[0375] - srs-ResourceSetId: SRS resource set index

[0376] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0377] - 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.

[0378] - 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'.

[0379] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0380] 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.

[0381] In addition, the base station and the terminal can transmit and receive upper layer signaling information to convey individual configuration information for the SRS resource. For example, the individual configuration information for the SRS resource can include time-frequency axis mapping information within the slot of the SRS resource, which can include information about frequency hopping within or between slots of the SRS resource. In addition, the individual configuration information for the SRS resource can include the time axis transmission configuration of the SRS resource, which can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This can be restricted to have the same time axis transmission configuration as the SRS resource set including the SRS resource. If the time axis transmission configuration of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (e.g., periodicityAndOffset) can additionally be included in the time axis transmission configuration.

[0382] 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 whose resourceType is set to periodic through higher layer signaling, and the UE can transmit the SRS resource referenced in the activated SRS resource set.

[0383] The time-frequency axis 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 may refer to the spatial relation information configured in the SRS resource, or may refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The terminal may transmit the SRS resource within the activated uplink BWP for the activated periodic SRS resource through upper layer signaling.

[0384] 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 whose resourceType is 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.

[0385] In addition, the spatial domain transmission filter applied to the transmitted SRS resource may refer to the spatial relation info configured in the SRS resource, or may refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. If the SRS resource has spatial relation info configured, the spatial domain transmission filter may be determined by referring to the configuration information for the spatial relation info transmitted through the MAC CE signaling that activates semi-persistent SRS transmission without following it. The terminal may transmit the SRS resource within the activated uplink BWP for the semi-persistent SRS resource activated through the upper layer signaling.

[0386] 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 the SRS resource referenced in the triggered SRS resource set. The time-frequency axis resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource.

[0387] In addition, the slot mapping of the transmitted SRS resource can be determined through the slot offset between the PDCCH including the DCI and the SRS resource, which can refer to the value(s) included in the slot offset set configured in the SRS resource set. Specifically, the slot offset between the PDCCH including the DCI and the SRS resource can apply the value indicated in the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set 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 info set in the SRS resource, or can refer to the associated CSI-RS information set 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.

[0388] When a base station triggers aperiodic SRS transmission to a terminal through DCI, a minimum time interval may be required between a PDCCH containing 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 by the terminal can be defined as the number of symbols between the last symbol of the PDCCH containing the DCI that triggers aperiodic SRS transmission and the first symbol to which the SRS resource that is transmitted first among the SRS resource(s) to be transmitted is mapped.

[0389] The minimum time interval can be determined with reference to the PUSCH preparation procedure time required for the UE 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 defined by considering the UE processing ability according to the UE capability by referring to the PUSCH preparation procedure time of the UE. In addition, considering the usage of the SRS resource set including the SRS resource to be transmitted, if the usage of the SRS resource set is set to 'codebook' or 'antennaSwitching', the minimum time interval can be determined as 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.

[0390] [Table 19]

[0391]

[0392]

[0393] The spatialRelationInfo setting information in [Table 19] 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 20] below.

[0394] [Table 20]

[0395]

[0396] Referring to the above spatialRelationInfo setting, the index of the reference signal to be referenced in order to use the beam information of a specific reference signal, i.e., the SS / PBCH block index, CSI-RS index, or SRS index, can be set. The upper signaling referenceSignal is setting information indicating which beam information of which reference signal is to be referenced for the corresponding SRS transmission, 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.

[0397] If the value of the upper signaling referenceSignal is set to 'ssb-Index', the terminal can apply the reception beam used when receiving the SS / PBCH block corresponding to the ssb-Index as the transmission beam for the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the terminal can apply the reception beam used when receiving the CSI-RS corresponding to 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.

[0398] [SRS Transmission Power Related]

[0399] In one embodiment of the present disclosure, a method is described in which a terminal sets and transmits the transmission power of an uplink reference signal (SRS) in response to a power control command received from a base station. The uplink reference signal transmission power (P) of the terminal is set together with an SRS power control adjustment state corresponding to the i-th transmission unit and the closed loop index l. SRS ) can be determined as shown in [Mathematical Formula 7] below, which is expressed in dBm units. In [Mathematical Formula 7] below, when a terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined for each cell c, carrier frequency f, and bandwidth part b, and can be distinguished by indices b, f, and c.

[0400] [Equation 7]

[0401]

[0402] - P CMAX,f,c (i): 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.

[0403] - P 0_SRS,b,f,c (q s ): bandwidth part b, carrier frequency f, cell c can be set to p0, which is the upper layer signaling, and SRS resource set q s can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0404] - μ: Subcarrier spacing configuration value

[0405] - M SRS,b,f,c (i): 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).

[0406] - α SRS,b,f,c (i): The bandwidth part b, carrier frequency f, and upper layer signaling for cell c can be set to alpha, and SRS resource set q s can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0407] - PL b,f,c (q d ): Pathloss is a path loss that indicates the path loss between the base station and the terminal. The terminal uses the reference signal (RS) resource q signaled by the base station. d Path loss is calculated from the difference between the transmission power and the terminal reception signal level of the reference signal.

[0408] - h b,f,c (i,l): 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.

[0409] The SRS power control adjustment state can be determined through the bandwidth part b, carrier frequency f, cell c, and i-th transmission unit.

[0410] - 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], f b,f,c(i,l) may mean the current PUSCH power control adjustment state. In this case, f can be achieved through various methods of the above-described embodiment 1. b,f,c We can compute (i,l) and its value is h b,f,c It can be used by substituting (i,l).

[0411] [Equation 8]

[0412]

[0413] - 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 closed loop l as in [Mathematical Formula 9] below.

[0414] [Equation 9]

[0415]

[0416] - δ SRS,b,f,c (m): It may be a value indicated by the TPC command field included in DCI format 2_3, and the value may follow [Table 17] above.

[0417] o is a specific set S of TPC command values ​​described above. i δ for all transmission units corresponding to SRS,b,f,c can mean the sum of the values ​​of c(S i ) is a set S i It can mean the number of all elements belonging to S imay mean a set of DCIs containing all TPC command values ​​for which TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. S i 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 as S i can be included as an element of .

[0418] ● S i The end point for determining is K from the start symbol of the i-th SRS transmission unit. SRS (i) It can be a point as far back as the symbol.

[0419] ● S i The starting point for determining is K from the starting symbol of the i - i0th SRS transmission unit. SRS It can be a point that is as far back as (i-i0)-1 symbols. i0, a positive integer, is the S i End point for determining (K from the start symbol of the i-th SRS transmission unit) SRS (i) from the starting symbol of the i - i0th SRS transmission unit, K SRS It can be determined as the smallest value that satisfies that the previous time point becomes an earlier time point in time by (i-i0) symbols.

[0420] ● For example, S i The end point for determining can be defined as sym(i), and K is the starting symbol of the i - i0th SRS transmission unit. SRS If the time point prior to (i-i0) symbols 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.

[0421] - 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.

[0422] [Equation 10]

[0423]

[0424] o δ SRS,b,f,c (i) may be a value indicated by the TPC command field included in DCI format 2_3 within the bandwidth part b, carrier frequency f, and cell c as described above, and the value may follow [Table 18] above. For example, if the value of the TPC command field is 0, δ SRS,b,f,c (i) can have a value of -4 dB.

[0425] [Regarding terminal capability reporting]

[0426] 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.

[0427] 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.

[0428] 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. In one embodiment, the method for the terminal to configure the UE capability in the NR system is as follows.

[0429] 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.

[0430] 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.

[0431] 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."

[0432] 4. The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final "candidate BC list" above. In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report according to the preset rat-Type order (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of "candidate feature set combinations" from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The "candidate feature set combinations" above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0433] 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.

[0434] 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.

[0435] [NC-JT related]

[0436] 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.

[0437] 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.

[0438] 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. 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.

[0439] The above-described NC-JT transmission can be applied to at least one of a downlink data channel (e.g., PDSCH), a downlink control channel (PDCCH), an uplink data channel (e.g., PUSCH), or an uplink control channel (PUCCH). When transmitting PDSCH, transmission information such as precoding, MCS, resource allocation, and TCI are indicated as DL DCI, and for NC-JT transmission, the transmission information must be independently indicated for each cell, TRP, or / and beam. This is a major factor that increases the payload required for DL ​​DCI transmission, which 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.

[0440] FIGS. 10A, 10B, and 10C are diagrams illustrating examples of antenna port configurations and resource allocation for transmitting PDSCHs using cooperative communication in a wireless communication system according to an embodiment of the present disclosure. Examples for PDSCH transmission are described for each Joint Transmission (JT) technique, and examples for allocating radio resources for each TRP are illustrated.

[0441] Referring to FIG. 10a, a coherent joint transmission (C-JT) (1000) supporting coherent precoding between each cell, TRP, or / and beam is illustrated.

[0442] In the case of C-JT, TRP A (1005) and TRP B (1010) transmit a single data (PDSCH) to the terminal (1015), and joint precoding can be performed on multiple TRPs. This may mean that DMRS is transmitted through the same DMRS ports for TRP A (1005) and TRP B (1010) to transmit the same PDSCH. For example, TRP A (1005) and TRP B (1010) 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.

[0443] Referring to FIG. 10b, a Non-Coherent Joint Transmission (NC-JT) (1020) is illustrated that supports non-coherent precoding between each cell, TRP, or / and beam for PDSCH transmission.

[0444] In the case of NC-JT, each cell, TRP, or / and beam transmits a PDSCH to the terminal (1035), 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.

[0445] Referring to FIG. 10c, various radio resource allocations can be considered, such as when the frequency and time resources used by multiple TRPs for PDSCH transmission are all the same (1040), when the frequency and time resources used by multiple TRPs do not overlap at all (1045), and when some of the frequency and time resources used by multiple TRPs overlap (1050).

[0446] To support NC-JT, DCIs of various forms, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to a single terminal.

[0447] FIGS. 11a, 11b, 11c, and 11d are diagrams illustrating examples of configurations 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.

[0448] Referring to FIG. 11a, case #1 (1100) 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.

[0449] Referring to FIG. 11b, case #2 (1105) 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.

[0450] 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.

[0451] In the aforementioned case #2 (1105), the degree of freedom in controlling or allocating each PDSCH may be limited depending on the content of the information element 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.

[0452] Referring to FIG. 11c, case #3 (1110) shows an example 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.

[0453] 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.

[0454] Case #3 (1110) may limit the 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 blind decoding of DCI of the terminal may be reduced compared to case #1 (1100) or case #2 (1105).

[0455] Referring to FIG. 11d, case #4 (1115) 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)), control information for PDSCHs transmitted from (N-1) additional TRPs is transmitted in the same DCI (Long DCI) as the control information for 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 a single DCI. In case #4 (1115), the complexity of DCI blind decoding of the terminal 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.

[0456] 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.

[0457] In the following description and examples, the aforementioned cases #1 (1100), #2 (1105), and #3 (1110), 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 (1115), 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). 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.

[0458] 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.

[0459] 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.

[0460] The wireless protocol architecture for NC-JT in the present disclosure can be used in various ways depending on the TRP deployment scenario. For example, when there is no or small backhaul delay between cooperative TRPs, a method using a structure based on MAC layer multiplexing (CA-like method) similar to 410 of FIG. 4 is possible. On the other hand, when the backhaul delay between cooperative TRPs is so large that it cannot be ignored (for example, when more than 2 ms is required for information exchange such as CSI, scheduling, and HARQ-ACK between cooperative TRPs), a method (DC-like method) is possible to secure delay-robust characteristics by using an independent structure for each TRP starting from the RLC layer similar to 420 of FIG. 4.

[0461] A terminal supporting C-JT or / and NC-JT can receive C-JT or / and NC-JT related parameters or setting values ​​from a higher layer configuration, and set the RRC parameters of the terminal based on the parameters. For the higher layer configuration, the terminal can utilize a UE capability parameter, for example, tci-StatePDSCH. Here, the UE capability parameter, for example, tci-StatePDSCH, can define TCI states for the purpose of PDSCH transmission, and the number of TCI states can be set to 4, 8, 16, 32, 64, 128 in FR1, and to 64 and 128 in FR2, and among the set number, up to 8 states can be set that can be indicated by 3 bits of the TCI field of the DCI via a MAC CE message. The maximum value 128 means the value indicated by maxNumberConfiguredTCIstatesPerCC in the tci-StatePDSCH parameter included in the capability signaling of the terminal. In this way, a series of configuration processes from upper layer configuration to MAC CE configuration can be applied to a beamforming instruction or beamforming change command for at least one PDSCH in one TRP.

[0462] [Multi-DCI based Multi-TRP]

[0463] 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.

[0464] 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.

[0465] * 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.

[0466] ** 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.

[0467] ** 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.

[0468] * 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.

[0469] * 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.

[0470] * 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.

[0471] 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.

[0472] The above settings can be independent on a per-cell or per-BWP basis. For example, a PCell may have two different CORESETPoolIndex values, while a specific SCell may not have a CORESETPoolIndex value set. 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 set.

[0473] The PDSCH TCI state activation / deactivation MAC-CE applicable to the multi-DCI based multi-TRP transmission method can follow FIGS. 9a and 9b.

[0474] Referring to Fig. 9a, the RRC configured TCI states (900) may include multiple TCI states, for example, TCI#0, TCI#1, ..., TCI#M-1. The TCI states (920) activated by MAC-CE for PDSCH may include TCI#0', TCI#1', ..., TCI#K-1, which correspond to MAC CE-based beam indications, respectively. The TCI state (940) for PDSCH may include TCI#1 corresponding to DCI-based beam selection.

[0475] Referring to FIG. 9b, if the terminal does not set CORESETPoolIndex for each of all CORESETs in the upper layer signaling PDCCH-Config, the terminal may ignore the CORESET Pool ID field (955) in the MAC-CE (950). If the terminal can support a multi-DCI based multi-TRP transmission method, i.e., if each CORESET in the upper layer signaling PDCCH-Config of the terminal has a different CORESETPoolIndex, the terminal may activate the TCI state in the DCI included in the PDCCH transmitted in the CORESETs having the same CORESETPoolIndex value as the value of the CORESET Pool ID field (955) in the MAC-CE (950). For example, if the value of the CORESET Pool ID field (955) in the MAC-CE (950) is 0, the TCI state in the DCI included in the PDCCH transmitted from CORESETs with CORESETPoolIndex of 0 may follow the activation information of the corresponding MAC-CE.

[0476] 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.

[0477] 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.

[0478] 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.

[0479] 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.

[0480] 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.

[0481] [Single-DCI based Multi-TRP]

[0482] 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.

[0483] In a single DCI-based multi-TRP transmission method, PDSCHs transmitted by multiple TRPs can be scheduled with a single DCI. The number of TCI states can be used as a method of indicating the number of TRPs transmitting the 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 DCI may correspond to one or two 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 TCI codepoint.

[0484] As another example, if at least one codepoint among all codepoints in the TCI state field in the DCI indicates two TCI states, the UE may consider that the base station can transmit based on the single-DCI based multi-TRP method. At least one codepoint in the TCI state field indicating two TCI states may be activated via the Enhanced PDSCH TCI state activation / deactivation MAC-CE.

[0485] FIG. 12 is a diagram illustrating an Enhanced PDSCH TCI state activation / deactivation MAC-CE structure according to one embodiment of the present disclosure. Referring to FIG. 12, the meaning of each field in the MAC CE and the values ​​that can be set in each field are as shown in [Table 21] below.

[0486] [Table 21]

[0487]

[0488] In Figure 12, if the value of the C0 field (1205) is 1, MAC-CE is TCI state ID 0,1 In addition to field (1210), TCI state ID 0,2 It may include field (1215). This is the TCI state ID for the 0th codepoint of the TCI state field included in the DCI. 0,1 and TCI state ID 0,2 This means that the MAC-CE is activated, and if the base station instructs the terminal with the above codepoint, the terminal can be instructed with two TCI states. If the value of the C0 field (1205) is 0, the MAC-CE is the TCI state ID. 0,2 It cannot contain field (1215), which is the TCI state ID for the 0th codepoint of the TCI state field contained within the DCI. 0,1 This means that one TCI state corresponding to is activated.

[0489] 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.

[0490] [Distinguishing between Single-DCI-based Multi-TRP PDSCH Repetitive Transmission Techniques (TDM / FDM / SDM)]

[0491] 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 a DCI field from a base station and higher-layer signaling configurations. Table 22 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.

[0492] [Table 22]

[0493]

[0494] In the above [Table 22], each column can be explained as follows.

[0495] - 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.

[0496] - 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.

[0497] - 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.

[0498] * 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.

[0499] * 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.

[0500] * Condition 3: If all TDRA entries that can be indicated by the Time Domain Resource Allocation field do not contain a setting for repetitionNumber.

[0501] - 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'.

[0502] - 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 22] above.

[0503] * 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.

[0504] * 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 equal to the repetitionNumber number greater than 1 set in the TDRA entry indicated by the Time Domain Resource Allocation field. 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.

[0505] * Multi-TRP SDM: This refers to a spatial resource division PDSCH transmission method based on multiple TRPs. This is a method of receiving layers separately 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.

[0506] * 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 to non-overlapping frequency resources. If the PRB bundling size is determined as wideband, when 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.

[0507] * 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.

[0508] * 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.

[0509] * Multi-TRP TDM scheme B: This refers to a PDSCH repeated transmission method between time resource division slots based on multiple TRPs. The terminal has one PDSCH transmission position (occasion) within one slot, and can receive repeated transmissions based on the start symbol and symbol length of the same PDSCH for a number of slots equal to the repetitionNumber indicated through the Time Domain Resource Allocation field in the DCI.

[0510] If 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 repetitionNumber is greater than 2, the UE can use different TCI state application methods depending on what tciMapping, a higher layer signaling, is configured to. If tciMapping is configured to cyclicMapping, the first and second TCI states are applied to the first and second PDSCH transmission positions, respectively, and this TCI state application method is applied to the remaining PDSCH transmission positions in the same way. If tciMapping is configured 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 this TCI state application method is applied to the remaining PDSCH transmission positions in the same way.

[0511] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. The contents of the present disclosure can be applied to FDD and TDD systems. In the present disclosure below, upper signaling (or upper layer signaling) refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of a physical layer, or a terminal transmits a signal to a base station using an uplink data channel of a physical layer, and may also be referred to as RRC signaling, PDCP signaling, or a MAC (medium access control) control element (MAC control element; MAC CE).

[0512] 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.

[0513] 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.

[0514] 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.

[0515] 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.

[0516] 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.

[0517] 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.

[0518] - MIB (Master Information Block)

[0519] - SIB (System Information Block) or SIB

[0520] - RRC (Radio Resource Control)

[0521] - MAC (Medium Access Control) CE (Control Element)

[0522] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the following physical layer channels or signaling.

[0523] - PDCCH (Physical Downlink Control Channel)

[0524] - DCI (Downlink Control Information)

[0525] - UE-specific DCI

[0526] - Group common DCI

[0527] - Common DCI

[0528] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0529] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0530] - PUCCH (Physical Uplink Control Channel)

[0531] - UCI (Uplink Control Information)

[0532] 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.

[0533] 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.

[0534] 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.

[0535] <Embodiment 1: Method for setting transmission power parameters when supporting integrated TCI state>

[0536] As one embodiment of the present disclosure, a method for setting transmission power parameters when a terminal supports an integrated TCI state is described. This embodiment can be operated in combination with other embodiments.

[0537] The terminal can receive ServingCellConfig, which is an upper layer signaling, from the base station, and additionally, the terminal can receive MIMOParam-r17, which is an upper layer signaling, within ServingCellConfig. The specific upper layer signaling structures of ServingCellConfig and MIMOParam-r17 can be as shown in [Table 23] below.

[0538] [Table 23]

[0539]

[0540] As in the above [Table 23], the terminal can receive the upper layer signaling, unifiedTCI-StateType-r17, from the base station within MIMOParam-r17, and the value can be either separate or joint.

[0541] - If the terminal receives the upper layer signaling unifiedTCI-StateType-r17 as separate, it may mean that when the terminal receives the configuration and instruction related to the unified TCI state from the base station, the terminal can individually configure and be instructed on the TCI state applicable to downlink reception (e.g., DL TCI state) and the TCI state applicable to uplink transmission (e.g., UL TCI state). In this case, the terminal can receive the upper layer signaling dl-OrJointTCI-StateList and ul-TCI-ToAddModList, which indicate the list of DL TCI states and UL TCI states, from the base station, respectively.

[0542] - If the terminal receives the upper layer signaling unifiedTCI-StateType-r17 as joint, it means that the terminal can comprehensively set and receive instructions for a TCI state applicable to downlink reception and uplink transmission (e.g., a joint TCI state) when receiving settings and instructions related to the unified TCI state from the base station. In this case, the terminal can receive the upper layer signaling dl-OrJointTCI-StateList, which means a list of joint TCI states, from the base station.

[0543] As in [Table 23] above, the terminal can receive the upper layer signaling uplink-PowerControlToAddModList set in MIMOParam-r17. The upper layer signaling uplink-PowerControlToAddModList can include the transmission power parameters for the PUSCH, PUCCH, and SRS of the terminal if the upper layer signaling unifiedTCI-StateType is set in the corresponding serving cell. The upper layer signaling uplink-PowerControlToAddModList can include a list of up to 64 Uplink-powerControl-r17s and Uplink-powerControlId-r17s. The upper layer signaling Uplink-powerControl-r17 can have a structure as shown in [Table 24] below.

[0544] As shown in [Table 23] above, a terminal can set pathlossReferenceLinking within ServingCellConfig. PathlossReferenceLinking, a higher layer signaling, can indicate whether the terminal references a list of reference signals for path loss measurement from SpCell or SCell.

[0545] [Table 24]

[0546]

[0547] As shown in the above [Table 24], the terminal may include ul-powercontrolId-r17 in one Uplink-powerControl-r17 parameter, and may set individual P0AlphaSet-r17 applicable to PUSCH, PUCCH, or SRS, respectively, and each P0AlphaSet-r17 may include at least one of the above-described uplink transmission power parameters p0, alpha, or closed loop index.

[0548] The upper layer signaling in [Table 23] above can be applied to all bandwidth portions within the corresponding serving cell. [Table 25] below shows the upper layer signaling structure that a terminal can configure for each uplink bandwidth portion (e.g., BWP-UplinkDedicated).

[0549] [Table 25]

[0550]

[0551] As in the above [Table 25], the terminal can be configured with the upper layer signaling ul-TCI-StateList-r17, and the terminal can be configured with either explicitlist or unifiedTCI-StateRef-r17. If the terminal has configured explicitlist for the upper layer signaling ul-TCI-StateList-r17, the terminal can explicitly configure a list of UL TCI states that can be used in the uplink bandwidth part through ul-TCI-ToAddModList-r17. If the terminal has configured unifiedTCI-StateRef-r17 for the upper layer signaling ul-TCI-StateList-r17, the terminal can use the joint TCI state or UL TCI state that can be used in the uplink bandwidth part by referring to the joint TCI state or UL TCI state configured in another uplink bandwidth part without explicitly configuring the joint TCI state or UL TCI state in the uplink bandwidth part. The upper layer signaling, unifiedTCI-StateRef-r17, can indicate the index of any bandwidth segment within any serving cell. Furthermore, the UE can expect that the serving cell containing the bandwidth segment configured with unifiedTCI-StateRef-r17 and any serving cell containing a bandwidth segment that can be configured from the base station via unifiedTCI-StateRef-r17 have the same unifiedTCI-StateType.

[0552] As in the above [Table 25], if the terminal is configured with unifiedTCI-StateType, the terminal can be configured with ul-powerControl, which is an upper layer signaling, and ul-powerControl can refer to one Uplink-powerControlId-r17. The terminal may be configured with ul-powerControl, which is an upper layer signaling, for all uplink bandwidth portions within a specific serving cell, or may not be configured with ul-powerControl, which is an upper layer signaling, for all uplink bandwidth portions. If the UE has received unifiedTCI-StateRef-r17 set in BWP-UplinkDedicated, or has received a configuration referencing another serving cell and bandwidth part with the value of unifiedTCI-StateRef-r17 in PDSCH-Config, and unifiedTCI-StateType is set to joint, the UE can expect to have ul-powerControl set in the referenced serving cell and all uplink bandwidth parts within the serving cell, or not to have ul-powerControl set in the referenced serving cell and all uplink bandwidth parts within the serving cell. The upper layer signaling ul-powerControl can be set to the UE only when the condition called NoTCI-PC is met, and the condition called NoTCI-PC can mean that the upper layer signaling ul-powerControl is not set in the joint TCI state or UL TCI state within the corresponding serving cell.

[0553] As in the above [Table 25], if the terminal is configured with unifiedTCI-StateType, the terminal may be configured with upper layer signaling pathlossReferenceRSToAddModList-r17, which may indicate a list of reference signals that may be used to calculate path loss when transmitting PUSCH, PUCCH, or SRS if the terminal supports unified TCI state. If the terminal is not configured with unifiedTCI-StateType, the terminal may not include any list in the upper layer signaling.

[0554] If the terminal is configured with unifiedTCI-StateType, and if the terminal is instructed to provide a reference signal for path loss measurement through a TCI state indication, the reference signal for the indicated path loss measurement may refer to a reference signal for path loss measurement set within a serving cell to which the instructed TCI state applies. If the terminal is configured with the pathlossReferenceLinking, the terminal may consider the reference signal for the indicated path loss measurement to refer to a reference signal for path loss measurement set within a serving cell set via the pathlossReferenceLinking.

[0555] If the terminal operates based on the integrated TCI state, that is, if the terminal has set the upper layer signaling, unifiedTCI-StateType, to joint or separate, the upper layer signaling structure of the TCI state that the terminal can be instructed to receive from the base station can be determined. If the terminal has set the upper layer signaling, unifiedTCI-StateType, to joint, the terminal can set and receive instructed of the joint TCI state from the base station using the upper layer signaling structure shown in [Table 26] below. If the terminal has set the upper layer signaling, unifiedTCI-StateType, to separate, the terminal can set and receive instructed of the DL TCI state from the base station using the upper layer signaling structure shown in [Table 26] below, and can set and receive instructed of the UL TCI state from the base station using the upper layer signaling structure shown in [Table 27].

[0556] If the terminal receives the upper layer signaling unifiedTCI-StateType as joint, the terminal can expect that pathlossReferenceRS-Id-r17 in [Table 26] below is always set, and if unifiedTCI-StateType is set to separate or unifiedTCI-StateType is not set, the terminal can expect that pathlossReferenceRS-Id-r17 is not set, and the name of such a condition can be defined as JointTCI1.

[0557] If the terminal receives the upper layer signaling unifiedTCI-StateType set to separate, the terminal can expect that pathlossReferenceRS-Id-r17 in [Table 27] below is always set, and the name of such a condition can be defined as Mandatory.

[0558] [Table 26]

[0559]

[0560] [Table 27]

[0561]

[0562] The terminal can set the upper layer signaling related to the transmission power parameters applicable to SRS transmission according to [Table 28] and [Table 29].

[0563] [Table 28]

[0564]

[0565] [Table 29]

[0566]

[0567]

[0568] The description of each upper layer signaling parameter in [Table 28] and [Table 29] above may be as follows.

[0569] - tpc-Accumulation: If the terminal is not configured for tpc-Accumulation, the terminal may perform an operation of additionally accumulating values ​​to previously indicated TPC command values ​​when receiving a TPC command indicating a change in SRS transmission power. If the terminal is configured for tpc-Accumulation as disabled, the terminal may perform an operation of applying the absolute TPC without performing an accumulation operation when receiving a TPC command indicating a change in SRS transmission power. Such an absolute TPC operation may be possible when the SRS does not share a closed-loop index with the PUSCH.

[0570] - Alpha: The terminal can set an alpha value to determine the SRS transmission power through the corresponding upper layer signaling.

[0571] - p0: The terminal can set the p0 value in the SRS-resourceSet to determine the SRS transmission power through the corresponding upper layer signaling. If the terminal has not set the unifiedTCI-StateType, which is the upper layer signaling, the terminal can set the P in the above [Mathematical Formula 7]. 0_SRS,b,f,c (q s ) can be determined through the corresponding upper layer signaling p0. If the terminal has set the upper layer signaling unifiedTCI-StateType, the terminal can determine the P in [Mathematical Formula 7]. 0_SRS,b,f,c (q s ) value can be set in p0 within the corresponding upper layer signaling SRS-resourceSet and p0AlphaSetforSRS within the Uplink-powerControlId-r17 (for example, P 0_SRS,b,f,c (q s)) can be determined by the sum of . The above Uplink-powerControlId-r17 can be determined by the following method.

[0572] ■ If the terminal determines the uplink transmission power through [Method 1-1], it can be determined through one ul-powerControl set within a specific uplink bandwidth section.

[0573] ■ If the terminal determines the uplink transmission power through [Method 1-2],

[0574] ■ If the terminal has set followUnifiedTCIstateSRS, which is an upper layer signaling, within the SRS resource set, the terminal 0_SRS,b,f,c (q s ), alpha and srs-PowerControlAdjustmentStates values ​​can be provided based on p0AlphaSetforSRS, which is an upper layer signaling associated with the TCIState or UL-TCIstate indicated by the base station, and pathlossReferenceRS, which is an upper layer signaling indicating a path loss reference signal, can be provided based on pathlossReferenceRS-Id-r17, which is an upper layer signaling associated with or included in the TCIState or UL-TCIstate indicated by the base station.

[0575] ■ If the terminal does not receive the upper layer signaling followUnifiedTCIstateSRS within the SRS resource set, the terminal 0_UE_SRS,b,f,c (q s), alpha, and srs-PowerControlAdjustmentStates values ​​may be provided based on p0AlphaSetforSRS, which is an upper layer signaling associated with the TCIState or UL-TCIstate set in the SRS resource of the lowest index within the SRS resource set, and pathlossReferenceRS, which is an upper layer signaling indicating a path loss reference signal, may be provided based on pathlossReferenceRS-Id-r17, which is an upper layer signaling associated with or included in the TCIState or UL-TCIstate set in the SRS resource of the lowest index within the SRS resource set.

[0576] - srs-PowerControlAdjustmentStates: The terminal can be configured with a closed circuit index used when determining SRS transmission power through the corresponding higher layer signaling. If the terminal has not been configured with the corresponding higher layer signaling, the terminal can share the closed circuit index of the SRS with the first closed circuit index of the PUSCH. If the terminal receives the corresponding higher layer signaling as sameAsFci2, the terminal can share the closed circuit index of the SRS with the second closed circuit index of the PUSCH. The terminal may be configured with the higher layer signaling so that it can have up to two closed circuit indices for the PUSCH. If the terminal receives the higher layer signaling as separateClosedLoop, the terminal can configure the closed circuit index of the SRS separately without sharing it with the closed circuit index of the PUSCH.

[0577] ■ If the terminal has received the upper layer signaling unifiedTCI-StateType and the srs-PowerControlAdjustmentStates set to separateClosedLoop within a specific SRS resource set, the terminal may consider the SRS resources included in the SRS resource set to be connected to a separate closed loop index with the PUSCH. The terminal may consider the separate closed loop index with the PUSCH as described above, regardless of the closed loop connected to the TCI state indicated by the base station.

[0578] ■ If the UE has received the upper layer signaling unifiedTCI-StateType and has not received the srs-PowerControlAdjustmentStates set to separateClosedLoop within a specific SRS resource set (i.e., has not received srs-PowerControlAdjustmentStates or has received it as sameAsFci2), the UE may consider that it is connected to the first or second closed loop index connected to the PUSCH for the SRS resources included in the SRS resource set. If the closed loop connected to the TCI state indicated by the base station is i0, the UE may consider that it is connected to the first closed loop index connected to the PUSCH when determining the transmit power of the SRS to which the TCI state is applied, and if the closed loop is i1, the UE may consider that it is connected to the second closed loop index connected to the PUSCH when determining the transmit power of the SRS to which the TCI state is applied.

[0579] - pathlossReferenceRSList: The terminal can receive a list of reference signals that can measure path loss for determining the transmission power of SRS through this upper layer signaling.

[0580] - followUnifiedTCI-StateSRS-r17: When the UE operates in an unified TCI state, i.e., when the UE has been configured with unifiedTCI-StateType, the UE can determine whether the joint TCI state or UL TCI state indicated through DCI to the UE will be applied to SRS resources within the corresponding SRS resource set through this upper layer signaling. If this upper layer signaling is configured as enabled, the UE can apply the joint TCI state or UL TCI state indicated through DCI to SRS resources within the corresponding SRS resource set. If this upper layer signaling is not configured for the UE, the UE can be configured with the joint TCI state or UL TCI state for each SRS resource within the SRS resource set, and may not apply the joint TCI state or UL TCI state indicated through DCI to SRS resources within the corresponding SRS resource set. The terminal can receive the corresponding upper layer signaling when the usage of the SRS resource set is set to beam management and the resourceType is aperiodic, or when the usage of the SRS resource set is set to codebook, non-codebook, or antenna switching and the resourceType is aperiodic, semi-persistent, or periodic.

[0581] - applyIndicatedTCI-State-r18: Through this upper layer signaling, the terminal can be configured which TCI state to apply to the SRS resource within the SRS resource set for which this upper layer signaling is configured when the terminal operates in an unified TCI state, i.e., when the terminal has been configured with unifiedTCI-StateType and operates with multiple TRPs. If the terminal has been configured with followUnifiedTCI-StateSRS-r17, the terminal may not be configured with applyIndicatedTCI-State-r18. The terminal can be configured with the corresponding upper layer signaling within the SRS resource set if the usage of the SRS resource set is configured with beam management and the resourceType is aperiodic, or if the usage of the SRS resource set is configured with codebook, non-codebook, or antenna switching and the resourceType is aperiodic, semi-persistent, or periodic.

[0582] ■ If the terminal operates with multiple TRPs based on single-DCI, that is, if the terminal has two joint TCI states or two DL TCI states or two UL TCI states configured in at least one codepoint of the TCI state field in the DCI, and if the terminal has received the corresponding upper layer signaling set to first, the terminal can apply the first joint TCI state or the first UL TCI state to one or more SRS resources within the SRS resource set for which the upper layer signaling has been set, among one or more joint TCI states or one or more UL TCI states indicated to the terminal through the DCI, and if the terminal has received the upper layer signaling set to second, the terminal can apply the second joint TCI state or the second UL TCI state to one or more SRS resources within the SRS resource set for which the upper layer signaling has been set, among one or more joint TCI states or one or more UL TCI states indicated to the terminal through the DCI. If the terminal has not been configured with this upper layer signaling, the terminal may be configured with a joint TCI state or UL TCI state for each of one or more SRS resources in the SRS resource set, and may not apply the joint TCI state or UL TCI state indicated through DCI to the SRS resources in the SRS resource set.

[0583] ■ If the terminal operates with multi-DCI-based multi-TRP, i.e., if the terminal has been set with two different CORESETPoolIndexes, the terminal may apply the joint TCI state or UL TCI state indicated through DCI received in the CORESET in which CORESETPoolIndex is set to 0 or 1 for one or more SRS resources within the SRS resource set in which the upper layer signaling is set, when the upper layer signaling is set to first or second. If the terminal has not been set with the upper layer signaling, and an SRS resource set in which resourceType is set to aperiodic is triggered through DCI, the terminal may determine the joint TCI state or UL TCI state to apply for one or more SRS resources within the SRS resource set, depending on which CORESETPoolIndex the corresponding DCI is received from.

[0584] For example, if the terminal has not been configured with the upper layer signaling, and the terminal has been configured with the followUnifiedTCI-StateSRS-r17, and an SRS resource set with resourceType set to aperiodic is triggered through DCI received within a CORESET with CORESETPoolIndex set to 0, the terminal may apply the joint TCI state or UL TCI state indicated through DCI received within a CORESET with CORESETPoolIndex set to 0 for one or more SRS resources within the SRS resource set. As another example, if the UE has not been configured with the corresponding higher layer signaling, and an SRS resource set with resourceType set to aperiodic is triggered through DCI received within a CORESET with CORESETPoolIndex set to 1, the UE may apply the joint TCI state or UL TCI state indicated through the DCI received within the CORESET with CORESETPoolIndex set to 1 to one or more SRS resources within the SRS resource set. If the UE has not been configured with the corresponding higher layer signaling, and the UE has not been configured with followUnifiedTCI-StateSRS-r17, the UE may be configured with the joint TCI state or UL TCI state for each of one or more SRS resources within the SRS resource set, and may not apply the joint TCI state or UL TCI state indicated through the DCI to SRS resources within the corresponding SRS resource set.

[0585] Considering the structure of the upper layer signaling described above, the terminal can use two uplink transmission power determination methods when operating in the integrated TCI state.

[0586] [Method 1-1] How to determine the basic transmission power: Applying common transmission power parameters

[0587] A terminal can be configured with an ul-powerControl parameter for each of one or more uplink bandwidth segments configured within a specific serving cell. That is, the terminal can apply a set of transmission power parameters (for example, at least one of p0, alpha, or a closed-loop index) that can be identified through ul-powerControl configured for the uplink bandwidth segment to all uplink transmissions within each uplink bandwidth segment. Accordingly, the terminal can use only a single common set of transmission power parameters without using individual transmission power parameters depending on the uplink channel and signal.

[0588] [Method 1-2] Additional transmission power determination method: Different transmission power parameters can be applied.

[0589] Instead of setting the ul-powerControl parameter for each of one or more uplink bandwidth portions set within a specific serving cell, the terminal can apply a set of transmission power parameters (e.g., p0, alpha, closed circuit index) that can be known through the upper layer signaling ul-powerControl-r17 within the joint TCI state or UL TCI state as in [Table 27] or [Table 27]. Accordingly, the terminal can set different ul-powerControl-r17 for each different joint TCI state or UL TCI state, and accordingly, can operate various transmission power parameters compared to [Method 1-1], and can use different transmission power parameters depending on the uplink transmission situation and the terminal and base station operation scenario.

[0590] In common with the above-described [Method 1-1] and [Method 1-2], the terminal can be configured with a reference signal for path loss measurement in the joint TCI state or the UL TCI state. That is, as described above, if the terminal operates in the integrated TCI state, the terminal can always be configured with a reference signal for path loss measurement in the joint TCI state or the UL TCI state, and the terminal can determine the path loss to be reflected when determining the uplink transmission power using the reference signal for path loss measurement set in the configured and instructed integrated TCI state. In addition, the terminal can track up to four reference signals for path loss measurement per any serving cell and update up to four different path losses.

[0591] 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 be configured by the base station through upper layer signaling for at least one combination of [Method 1-1] and [Method 1-2].

[0592] <Example 2: Method for calculating the difference in path loss between a terminal and a base station>

[0593] As one embodiment of the present disclosure, a method for calculating the difference in path loss between a terminal and a base station is described. This embodiment can be operated in combination with other embodiments.

[0594] FIG. 13 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.

[0595] Referring to FIG. 13, a terminal (1310) may be connected to and operate with a base station (e.g., network entity (1315)) that operates with multiple TRPs as described above. The terminal (1310) may assume that each of the plurality of TRPs supports both uplink reception and downlink transmission. In addition to a conventional TRP capable of both uplink reception and downlink transmission (e.g., TRP1 (1300)), the base station may also operate a TRP that supports only uplink reception (e.g., TRP2 (1305)) for the purpose of improving uplink coverage from the perspective of the terminal (1310) or for the purpose of energy saving benefits that can be obtained by saving downlink transmission power at the base station. This TRP2 (1305) that supports only uplink reception may be referred to as a UL-only TRP. The terminal (1310) may assume that downlink transmission is not performed from the UL-only TRP (1305). As an assumption for such UL-only TRP (1305), the base station and terminal (1310) can consider at least one combination among the following.

[0596] - UL-only TRP (1305) can operate as UL-only TRP only for specific terminals (for example, terminal (1310). That is, UL-only TRP (1305) actually has both uplink reception and downlink transmission functions, but for specific terminals, it can support only uplink reception function under specific conditions (for example, by notifying the terminal that it is connected to 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 function of TRP already installed or newly installed near the location when specific terminals exist at the boundary of any cell coverage.

[0597] - UL-only TRP (1305) does not support downlink transmission functions for all terminals, and can only support uplink reception functions. In other words, UL-only TRP (1305) is a TRP with relatively low production and installation costs, and in addition to existing TRPs, it can additionally receive uplink transmissions from terminals, thereby obtaining reception diversity from the base station's perspective.

[0598] The terminal (1310) can receive a path loss measurement reference signal from the TRP (1300) capable of uplink and downlink operations, but since downlink transmission is not performed from the UL-only TRP (1305), there may be a problem in that the path loss between the UL-only TRP (1305) and the terminal (1310) cannot be known when the terminal (1310) performs uplink transmission toward the UL-only TRP (1305). To solve this situation, the base station and the terminal (1310) may consider a combination of at least one of the following methods to obtain path loss information between the UL-only TRP (1305) and the terminal (1310).

[0599] [Method 2-1]

[0600] FIG. 14 is a diagram illustrating a method for calculating and updating a path loss difference value according to one embodiment of the present disclosure.

[0601] Referring to FIG. 14, a terminal (1400) may be connected to and operate a base station that is configured with a TRP capable of uplink and downlink operations (e.g., TRP1 (1410)) and a UL-only TRP capable of only uplink reception (e.g., TRP2 (1405)). The terminal (1400) and the base station may go through a series of processes of exchanging signals between the terminal (1400) and the base station to obtain information on the path loss amount between TRP2 (1410) and the terminal (1400).

[0602] [Process 2-1] Uplink transmission of terminal (1400)

[0603] The terminal (1400) can transmit an uplink signal to TRP1 (1405) and TRP2 (1410) (1415). If the terminal (1400) operates in FR1, the terminal (1400) can transmit an uplink signal to TRP1 (1405) and TRP2 (1410) with only a single uplink transmission, and if the terminal (1400) operates in FR2, the terminal (1400) can perform individual uplink transmissions by applying different transmission beams to TRP1 (1405) and TRP2 (1410). If the terminal (1400) operates in FR2, when the terminal (1400) determines the transmission power of individual uplink signals transmitted to TRP1 (1405) and TRP2 (1410), the terminal (1400) may apply the same transmission power parameters (1420). That is, when the terminal (1400) determines the transmission power of two uplink signals, the terminal (1400) may consider the same transmission power parameters (e.g., p0, alpha, closed loop index, and / or path loss between TRP1 (1405) and the terminal (1400). Accordingly, when the terminal (1400) transmits an uplink signal to TRP2 (1410), the terminal (1400) may apply the path loss between TRP1 (1405) and the terminal (1400) to determine the transmission power of the uplink signal.

[0604] [Process 2-2] Calculating the difference in path loss at the base station

[0605] Thereafter, TRP1 (1405) and TRP2 (1410) can receive the uplink transmission of the terminal (1400) and calculate the reception power P1 (1425) and P2 (1430) at each TRP. TRP2 (1410) can transmit P2 to TRP1 (1405) (1435). TRP1 (1405), which receives P2 from TRP2 (1410), can calculate the difference between P1 and P2, d_P (1440). When calculating d_P in TRP1(1405) (1440), TRP1(1405) can consider the reception beam gain in TRP1(1405), the reception beam gain in TRP2(1410), and in case of FR2, the terminal can consider each transmission beam gain when transmitting to TRP1(1405) and TRP2(1410) and the MPE (Maximum Permissible Exposure) value that can determine the amount of transmission power reduction for each transmission beam.

[0606] [Process 2-3] Transmitting the difference in path loss to the terminal (1400)

[0607] The base station can calculate d_P, which is the difference between the path loss between TRP1 (1405) and the terminal (1400) and the path loss between TRP2 (1410) and the terminal (1400), and then notify the terminal (1400) of the calculated value (1445). The terminal (1400) can obtain the d_P value (1450), and when performing uplink transmission for TRP2 (1410), in addition to the path loss that can be measured through the reference signal for path loss measurement that can be received from TRP1 (1405), can determine the uplink transmission power for TRP2 (1410) by applying the d_P value.

[0608] Through the above [Process 2-1] to [Process 2-3], the base station can use the reception power information of the uplink signal of the terminal (1400) to calculate d_P, which is the difference value between the path loss between TRP1 (1405) and the terminal (1400) and the path loss between TRP2 (1410) and the terminal (1400). In the above [Process 2-3], the base station can process (for example, take the arithmetic mean) one or more d_P values ​​calculated by repeating [Process 2-1] and [Process 2-2] one or more times and transmit them to the terminal (1400).

[0609] If the terminal (1400) is not a device fixed to a specific location such as a Customer Premises Equipment (CPE), but is a mobile device such as a smartphone, smartwatch, or tablet, d_P may be a value that changes over time. Therefore, the above [Process 2-1] to [Process 2-3] may be set or activated to be repeated periodically or semi-continuously for the terminal (1400), or may be triggered aperiodically for the terminal (1400). In order to check the changing d_P value and transmit it to the terminal (1400), the following additional processes may be considered between the terminal (1400) and the base station.

[0610] [Process 2-4] Uplink transmission of terminal (1400) after obtaining d_P

[0611] After acquiring d_P from the base station, the terminal (1400) can transmit an uplink signal to TRP1 (1405) and TRP2 (1410) (1455). If the terminal (1400) operates in FR1, the terminal (1400) can transmit an uplink signal to TRP1 (1405) and TRP2 (1410) with only a single uplink transmission. If the terminal (1400) operates in FR2, the terminal (1400) can perform individual uplink transmissions by applying different transmission beams to TRP1 (1405) and TRP2 (1410). If the terminal (1400) operates in FR2, when the terminal (1400) determines the transmission power of individual uplink signals transmitted to TRP1 (1405) and TRP2 (1410), the terminal (1400) may apply the same transmission power parameters (1460). When the terminal (1400) determines the transmission power of the two uplink signals, the terminal (1400) may consider the same transmission parameters (e.g., p0, alpha, closed loop index, and path loss between TRP1 (1405) and the terminal (1400).

[0612] In addition, although the terminal (1400) has obtained the d_P value through the above [Process 2-3], the terminal (1400) may transmit an uplink signal without applying d_P when determining the uplink transmission power to TRP2 (1410) so that the base station can calculate the difference value between the path loss between TRP1 (1405) and the terminal (1400) and the path loss between TRP2 (1410) and the terminal (1400) by applying the same transmission power parameter to the two TRPs (1405, 1410) (1460). Accordingly, even when the terminal (1400) transmits an uplink signal to TRP2 (1410), the terminal (1400) may apply only the path loss between TRP1 (1405) and the terminal (1400) to determine the transmission power of the uplink signal.

[0613] [Process 2-5] Calculating the difference in path loss at the base station

[0614] TRP1 (1405) and TRP2 (1410) can receive the uplink transmission of the terminal (1400) in the above [process 2-4] and calculate the reception power P1' (1465) and P2' (1470) at each TRP. TRP2 (1410) can transmit P2' to TRP1 (1405) (1475). TRP1 (1405), which receives P2' from TRP2 (1410), can calculate d_P', which is the difference between P1' and P2' (1480). When calculating d_P' in TRP1(1405) (1480), TRP1(1405) can consider the reception beam gain in TRP1(1405), the reception beam gain in TRP2(1410), and in case of FR2, the terminal can consider each transmission beam gain when transmitting to TRP1(1405) and TRP2(1410) and the MPE (Maximum Permissible Exposure) value that can determine the amount of transmission power reduction for each transmission beam.

[0615] [Process 2-6] Transmitting the difference in path loss to the terminal

[0616] The base station can calculate d_P', which is the difference between the path loss between TRP1 (1405) and the terminal (1400) and the path loss between TRP2 (1410) and the terminal (1400), and then notify the terminal (1400) of the calculated value (1485). The terminal (1400) can obtain the updated d_P' value compared to the previously obtained d_P value (1490), and thereafter, when performing uplink transmission for TRP2 (1410), in addition to the path loss that can be measured through the reference signal for path loss measurement that can be received from TRP1 (1405), can determine the uplink transmission power for TRP2 (1410) by applying the d_P' value.

[0617] Thereafter, the terminal (1400) and the base station may repeat [Step 2-4] to [Step 2-6] to calculate and share an updated value for the d_P value. In [Step 2-6], the base station may process (for example, take an arithmetic mean) one or more d_P' values ​​calculated by repeating [Step 2-4] and [Step 2-5] one or more times and transmit them to the terminal (1400).

[0618] If the terminal (1400) performs the uplink transmission shown in the above [Process 2-1] and [Process 2-4], the terminal (1400) can set one or more SRS resources in the SRS resource set in which the upper layer signaling resourceType is set to periodic, semi-persistent, or aperiodic, and perform the above [Process 2-1] and [Process 2-4] based on SRS transmission, and all of the one or more SRS resources can have the same transmission power parameter.

[0619] If the terminal (1400) operates in FR1, the terminal (1400) can apply the same transmission power parameter (for example, at least one of p0, alpha, closed loop index, or path loss) to TRP1 (1405) and TRP2 (1410) based on one SRS resource in the SRS resource set, and even if it is an uplink transmission for TRP2 (1410), the difference value of the path loss may not be applied when determining the transmission power as described above. If the terminal (1400) operates in FR2, the terminal (1400) can apply the same transmission power parameter (for example, p0, alpha, closed loop index, and path loss) to TRP1 (1405) and TRP2 (1410) based on one or more SRS resources in the SRS resource set, and can apply different transmission beams to each SRS resource. Similarly to the above, the terminal (1400) may not apply the difference value of the path loss amount when determining the transmission power of the uplink transmission for TRP2 (1410).

[0620] The terminal (1400) can also perform the uplink transmission shown in [Process 2-1] and [Process 2-4] through an uplink channel and signal other than SRS (for example, at least one of PUCCH, PUSCH, or PRACH).

[0621] When the terminal (1400) performs uplink transmission as shown in [Process 2-1] and [Process 2-4], it is necessary to apply the same transmission power parameter to the uplink channel or signal transmitted to TRP1 (1405) and TRP2 (1410) within each process, but it may be possible to use different transmission power parameters between processes (for example, the transmission power parameter used in [Process 2-1] and the transmission power parameter used in [Process 2-4]).

[0622] For example, if the terminal (1400) determines the uplink transmission power using the first p0, the first alpha, the first closed-loop index, and / or the first path loss in [Process 2-1] and transmits the uplink transmission power to TRP1 (1405) and TRP2 (1410), the terminal (1400) may be able to determine the uplink transmission power using the second p0, the second alpha, the second closed-loop index, and / or the second path loss in [Process 2-4] and transmit the uplink transmission power to TRP1 (1405) and TRP2 (1410). The first p0 and the second p0 may be the same or different, and a similar relationship may be established for other transmission power parameters.

[0623] In the case of the above [Method 2-1], the terminal (1400) can receive the d_P value from the base station through the above [Process 2-3] and [Process 2-6]. In the case of the above [Method 2-1], since the terminal (1400) receives the d_P value from the base station, when the same quantization bit amount is considered, an inaccurate value may be received compared to receiving the d_P'' value that can be considered in the following [Method 2-2]. However, as described above, since there is no restriction that the same transmission power parameter must be used between each transmission time point as in the above [Process 2-1] and [Process 2-4], the base station can be flexible in operating such uplink transmission.

[0624] [Method 2-2]

[0625] FIG. 15 is a diagram illustrating another method for calculating and updating a path loss difference value according to one embodiment of the present disclosure.

[0626] Referring to FIG. 15, a terminal (1500) can be connected to and operate at a base station that is configured with a TRP capable of uplink and downlink operations (e.g., TRP1 (1510)) and a UL-only TRP capable of only uplink reception (e.g., TRP2 (1505)). The terminal (1500) and the base station can go through a series of processes of exchanging signals between the terminal (1500) and the base station to obtain information on the path loss amount between TRP2 (1510) and the terminal (1500).

[0627] [Process 3-1] Uplink transmission of terminal (1500)

[0628] The terminal (1500) can transmit an uplink signal to TRP1 (1505) and TRP2 (1510) (1515). If the terminal (1500) operates in FR1, the terminal (1500) can transmit an uplink signal to TRP1 (1505) and TRP2 (1510) with only a single uplink transmission. If the terminal (1500) operates in FR2, the terminal (1500) can perform individual uplink transmissions by applying different transmission beams to TRP1 (1505) and TRP2 (1510).

[0629] If the terminal (1500) operates in FR2, when the terminal (1500) determines the transmission power of individual uplink signals transmitted to TRP1 (1505) and TRP2 (1510), the terminal (1500) may apply the same transmission power parameters (1520). That is, when the terminal (1500) determines the transmission power of two uplink signals, the terminal (1500) may consider the same p0, alpha, closed circuit index, and / or path loss between TRP1 (1505) and the terminal (1500). The terminal (1500) may apply the path loss between TRP1 (1505) and the terminal (1500) to determine the transmission power of the uplink signal transmitted to TRP2 (1510).

[0630] [Process 3-2] Calculating the difference in path loss at the base station

[0631] Thereafter, TRP1 (1505) and TRP2 (1510) can receive the uplink transmission of the terminal (1500) and calculate the reception power P1 (1525) and P2 (1530) at each TRP. TRP2 (1510) can transmit P2 to TRP1 (1505) (1535). TRP1 (1505), which receives P2 from TRP2 (1510), can calculate the difference between P1 and P2, d_P (1540). When calculating d_P in TRP1(1505), (1540) TRP1(1505) may consider the reception beam gain in TRP1(1505), the reception beam gain in TRP2(1510), and in case of FR2, the terminal (1500) may consider each transmission beam gain and / or the MPE (Maximum Permissible Exposure) value that can determine the transmission power reduction amount for each transmission beam when transmitting to TRP1(1505) and TRP2(1510).

[0632] [Process 3-3] Transmitting the difference in path loss to the terminal (1500)

[0633] The base station can calculate d_P, which is the difference between the path loss between TRP1 (1505) and the terminal (1500) and the path loss between TRP2 (1510) and the terminal (1500), and then notify the terminal (1500) of the calculated value (1545). The terminal (1500) can obtain the d_P value (1550), and thereafter, when performing uplink transmission for TRP2 (1510), in addition to the path loss that can be measured through the reference signal for path loss measurement that can be received from TRP1 (1505), the base station can determine the uplink transmission power for TRP2 (1510) by applying the obtained d_P value.

[0634] Through the above [Process 3-1] to [Process 3-3], the base station can use the reception power information of the uplink signal of the terminal (1500) to calculate d_P, which is the difference value between the path loss between TRP1 (1505) and the terminal (1500) and the path loss between TRP2 (1510) and the terminal (1500). In the above [Process 3-3], the base station can process (for example, take the arithmetic mean) one or more d_P values ​​calculated by repeating [Process 3-1] and [Process 3-2] one or more times and transmit them to the terminal (1500). In addition, in the above [process 3-3], the base station may initially perform the notification of the d_P value to the terminal (1500) once at the base station, and when the terminal (1500) and the base station repeat [process 3-1] and [process 3-2] thereafter, the base station may optionally perform the above [process 3-3].

[0635] Meanwhile, if the terminal (1500) is not a device fixed to a specific location such as a Customer Premises Equipment (CPE), for example, if the terminal is a mobile device such as a smartphone, smartwatch, or tablet, d_P may be a value that changes over time. Accordingly, the above [Process 3-1] to [Process 3-3] may be set or activated to be repeated periodically or semi-continuously for the terminal (1500), or may be triggered aperiodically for the terminal (1500). If the above [Process 2-4] to [Process 2-6] were a method in which the terminal (1500) and the base station updated the d_P value and shared it with each other, the following [Process 3-4] to [Process 3-6] may be a method in which the terminal (1500) and the base station consider the d_P value acquired through the above [Process 3-1] to [Process 3-3] as an initial value, calculates the amount of change therein, and shares it with each other. In order to check the change in the d_P value and transmit it to the terminal (1500), the following additional processes may be considered between the terminal (1500) and the base station.

[0636] [Process 3-4] Uplink transmission of terminal (1500) after obtaining d_P

[0637] After acquiring d_P from the base station, the terminal (1500) can transmit an uplink signal to TRP2 (1510) (1555). The terminal (1500) can use p0, alpla, and / or the closed circuit index among the transmission power parameters used in the above [Process 3-1], and in the case of path loss, the d_P value acquired in the above [Process 3-3] can be applied to the path loss between TRP1 (1505) and the terminal (1500) (1560). If the terminal (1500) operates in FR2, the terminal (1500) can use the same or different transmission beams used in the above [Process 3-1] and the corresponding [Process 3-4]. If the terminal (1500) uses the same transmission beam in the above [process 3-1] and the corresponding [process 3-4], the base station does not need to compensate for the difference in transmission beam gain value due to the change in transmission beam in the terminal (1500) when calculating the change in d_P in the subsequent process. However, if this is not the case (i.e., if the terminal (1500) uses different transmission beams in the above [process 3-1] and the corresponding [process 3-4]), the base station can compensate for the difference in each transmission beam gain value in the subsequent process to increase the accuracy when calculating the change in d_P value.

[0638] [Process 3-5] Calculating the difference in path loss at the base station

[0639] Afterwards, TRP2 (1510) can receive the uplink transmission of the terminal (1500) in the above [Process 3-4] and calculate the reception power P2'' (1565). TRP2 (1510) can compare the value obtained by subtracting the d_P value from the P2 calculated in the above [Process 3-2] (for example, P2 - d_P) with the P2'' value. The P2 is a reception power value calculated based on a transmission power parameter that does not consider the difference value of the path loss amount, and the P2'' is a reception power value calculated by additionally applying the difference value of the path loss amount to the same transmission power parameter as when calculating the P2. Therefore, comparing the value obtained by subtracting the d_P value from the P2 and the P2'' may be the same as estimating the amount of change in the d_P value.

[0640] Through this, TRP2 (1510) can calculate the d_P'' value, which is the change in the d_P value (1570). When calculating d_P'' in TRP2 (1510) (1570), TRP2 (1510) can consider the reception beam gain in TRP2 (1510), and in case of FR2, each transmission beam gain considered when the terminal transmits to TRP2 (1510) and the MPE (Maximum Permissible Exposure) value that can determine the transmission power reduction amount for each transmission beam. TRP2 (1510) can update the previously calculated d_P value by considering the calculated d_P'' (1571) (for example, d_P = d_P - d_P''). Afterwards, TRP2 (1510) can transfer the d_P'' value to TRP1 (1505) (1575).

[0641] [Process 3-6] Transmitting the difference in path loss to the terminal (1500)

[0642] The base station can calculate the change amount d_P'' of the path loss between TRP1 (1505) and the terminal (1500) and the difference in the path loss amount d_P between TRP2 (1510) and the terminal (1500), and then notify the terminal (1500) of the calculated value (1580). The terminal (1500) can obtain an updated d_P value by applying the change amount to the previously obtained d_P value (1585). Thereafter, when performing uplink transmission for TRP2 (1510), the terminal (1500) can determine the uplink transmission power for TRP2 (1510) by applying the d_P value, which is the difference in the path loss amount, and the change amount d_P'' in addition to the path loss amount that can be measured through the reference signal for measuring the path loss amount that can be received from TRP1 (1505).

[0643] The terminal (1500) and the base station may repeat [Step 3-4] to [Step 3-6] to calculate and share an updated value for the d_P value. In the [Step 3-6], the base station may process (for example, take an arithmetic mean) one or more d_P'' values ​​calculated by repeating [Step 3-4] and [Step 3-5] one or more times and transmit the processed values ​​to the terminal (1500). In addition, the TRP2 (1510) may use the processed (for example, take an arithmetic mean) one or more d_P'' values ​​calculated by repeating [Step 3-4] and [Step 3-5] one or more times to update the d_P value in the [Step 3-5].

[0644] When the terminal (1500) performs uplink transmission as shown in the above [process 3-1], it can perform SRS transmission based on setting one or more SRS resources in an SRS resource set in which the upper layer signaling resourceType is set to periodic, semi-persistent, or aperiodic, and all of these one or more SRS resources can have the same transmission power parameter.

[0645] If the terminal (1500) operates in FR1, the terminal (1500) can apply the same transmission power parameters (e.g., p0, alpha, closed loop index, and / or path loss) to TRP1 (1505) and TRP2 (1510) based on one SRS resource within the SRS resource set, and even if it is an uplink transmission for TRP2 (1510), the difference in path loss may not be applied when determining the transmission power as described above. If the terminal (1500) operates in FR2, the terminal (1500) can apply the same transmission power parameters (e.g., p0, alpha, closed loop index, and / or path loss) to TRP1 (1505) and TRP2 (1510) based on one or more SRS resources within the SRS resource set, and can apply different transmission beams to each SRS resource. Similarly to the above, even if the terminal (1500) is transmitting uplink to TRP2 (1510), the difference value of the path loss may not be applied when determining the transmission power as described above.

[0646] When the terminal (1500) performs uplink transmission as shown in the above [process 3-4], it can perform SRS transmission based on setting one or more SRS resources in an SRS resource set in which the resourceType, which is an upper layer signaling, is set to periodic, semi-persistent, or aperiodic, and all of these one or more SRS resources can have the same transmission power parameter.

[0647] If the terminal (1500) performs both the uplink transmission in [Process 3-1] and the uplink transmission in [Process 3-4] based on an SRS resource within an SRS resource set in which the resourceType is set to periodic or semi-persistent, the terminal (1500) can assume that the period of the uplink transmission for [Process 3-1] is longer than or equal to the period of the uplink transmission for [Process 3-4].

[0648] For example, if the period of uplink transmission for the above [Process 3-1] is 10 slots and the period of uplink transmission for the above [Process 3-4] is 2 slots, the terminal (1500) does not need to consider the constraint that the transmission power parameter must be the same between each transmission time point of the uplink transmission for the above [Process 3-1], and as described above, when transmission for TRP1 (1505) and TRP2 (1510) is performed individually within each transmission time point of the uplink transmission for the above [Process 3-1], the transmission power parameter may be considered to be the same during transmission for the two TRPs.

[0649] In addition, the terminal (1500) may use the transmission power parameter used in the transmission period of the uplink transmission for the most recent [process 3-1] performed prior to the uplink transmission in the case of the uplink transmission for the [process 3-4]. For example, if the terminal (1500) performed the uplink transmission for the [process 3-1] in slot n and used the first transmission power parameter set, the terminal (1500) may use the first transmission power parameter set for the uplink transmission for the [process 3-4] from slot n to before slot n+10, which is the next cycle, and as described above, the difference value of the path loss amount described above may also be applied in the uplink transmission for the [process 3-4]. This is because in the above [Process 3-4], when calculating d_P'' in TRP2 (1510), the P2 value, which is the received power calculated through the previous uplink transmission, is taken into consideration, so there must be a constraint that the transmission power parameter must be the same for the two uplink transmissions, so that a more accurate d_P'' value can be calculated.

[0650] The terminal (1500) can also perform the uplink transmission shown in [Process 3-1] and [Process 3-4] through uplink channels and signals other than SRS (e.g., PUCCH, PUSCH, and / or PRACH).

[0651] In the case of the above [Method 2-2], the terminal (1500) can receive the d_P value from the base station at least once initially through the above [Process 3-3], and can be notified of the d_P'' value from the base station through the above [Process 3-6]. In the case of the above [Method 2-2], although the terminal (1500) may need to be configured by the base station for different uplink transmissions for the above [Process 3-1] and [Process 3-4], signaling overhead may be added for this, but when the same quantization bit amount is considered, the terminal (1500) may have the advantage of being able to receive a more accurate value for the difference in path loss amount by receiving the d_P'' value compared to receiving the d_P value from the base station.

[0652] Through the above-described [Method 2-1] and [Method 2-2], a terminal (e.g., terminal (1400 or 1500)) can use the modified transmission power calculation formula as follows when determining uplink transmission power for UL-only TRP.

[0653] For example, when determining the PUCCH transmission power for a UL-only TRP (e.g., TRP2 (1410 or 1510)) that supports only uplink reception operation, the terminal may modify [Equation 2] as in [Equation 11] below and use it. PL in [Equation 11] below off,b,f,c ( ) 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. The terminal If it corresponds to one path loss measurement reference signal, =q d It can be considered as

[0654] [Equation 11]

[0655]

[0656] 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. In this case, PL in [Equation 12] or [Equation 13] below off,b,f,c ( ) 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, =q d It can be considered as [Mathematical Formula 12] or [Mathematical Formula 13] below is the difference in path loss, PL off,b,f,c ( ) can be distinguished depending on whether the value is directly applied to the path loss amount.

[0657] [Equation 12]

[0658]

[0659] [Equation 13]

[0660]

[0661] 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. In this case, PL in [Equation 14] or [Equation 15] below off,b,f,c ( ) 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, =q d It can be considered as [Mathematical Formula 14] or [Mathematical Formula 15] below is the difference in path loss, PL off,b,f,c ( ) can be distinguished depending on whether the value is directly applied to the path loss amount.

[0662] [Equation 14]

[0663]

[0664] [Equation 15]

[0665]

[0666] The terminal may be notified by the base station of at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling for at least one combination of the above [Method 2-1] and [Method 2-2], or may expect that at least one combination of the above [Method 2-1] and [Method 2-2] is fixedly defined in the standard. Additionally, if the terminal is notified by the base station of at least one combination of specific methods for at least one method for at least one method for at least one method, it may mean that the terminal cannot support at least one other combination of specific methods.

[0667] For example, the terminal may expect that [Method 2-1] or [Method 2-2] is fixedly defined in the standard for the method of obtaining and updating the difference in path loss amount. As another example, the terminal may be notified of [Method 2-1] from the base station through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the terminal may consider that the base station has notified that [Method 2-2] is not supported.

[0668] The terminal may report to the base station, based on the terminal capability, whether it can support at least one combination of [Method 2-1] and [Method 2-2]. If the terminal reports to the base station, based on the terminal capability, that it can support a combination of one or more specific methods, it may be regarded as reporting that the terminal cannot support one or more other combinations of methods. For example, the terminal may report to the base station, based on the terminal capability, whether it can support [Method 2-1] or [Method 2-2]. As another example, the terminal may report to the base station that it can support [Method 2-1], and this terminal capability report may mean that the terminal cannot support [Method 2-2].

[0669] <Third embodiment: Method for updating the difference value of path loss between terminal and base station>

[0670] As one embodiment of the present disclosure, a method for updating the difference value of path loss between a terminal and a base station is described. This embodiment can be operated in combination with other embodiments.

[0671] The terminal can receive, from the base station, a d_P value, which is a difference value between a path loss amount between a TRP capable of both uplink and downlink operations and a path loss amount between a UL-only TRP capable of only uplink reception operations and a terminal, in [Process 2-3] and [Process 2-6] within the above-mentioned [Method 2-1] and [Process 3-3] within the above-mentioned [Method 2-2]. In addition, the terminal can receive, from the base station, a d_P'' value, which is a change in the d_P, in [Process 3-6] within the above-mentioned [Method 2-2]. The d_P value or the d_P'' value can be any integer in dB units.

[0672] For example, the terminal may assume that the distance between the TRP and the terminal, which are capable of both uplink and downlink operations, is shorter than the distance between the TRP and the terminal, which are capable of both uplink and downlink operations. Based on this, the d_P value may only have a value less than or equal to 0, and the d_P'' value may be an integer. The terminal may consider a combination of at least one of the following items as a method for receiving the difference value or the change amount of the path loss from the base station.

[0673] [Method 3-1]

[0674] 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 in the d_P value, from the base station through upper layer signaling. The terminal can receive one or more d_P values, which are the difference values ​​of the path loss amount, or the d_P'' value, which is the change in the d_P value, for each bandwidth portion or each cell. For example, the terminal can receive as many d_P values ​​or d_P'' values ​​as the maximum number of path loss measurement reference signals that the terminal can track within a specific cell, through upper layer signaling. Since 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 in the d_P value, from the base station only through upper layer signaling through the method, the set value cannot be changed unless RRC reconfiguration is performed on the terminal.

[0675] In the case where the terminal receives the d_P value, which is the difference value of the path loss, or the d_P'' value, which is the change in the d_P value, as set by upper layer signaling in [Method 3-1], the difference value of the path loss between the terminal and the base station may be set semi-statically and may not be dynamically changed, which may be inflexible, and if the terminal has mobility, the time interval for correcting the difference value of the path loss may be very long. However, if the terminal has a fixed location such as a CPE or has very low mobility, or if the information exchange between TRPs is very slow, it may be an effective method for determining the transmission power when transmitting uplink to the UL-only TRP by reflecting the difference value of the path loss while saving additional dynamic signaling.

[0676] [Method 3-2]

[0677] 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, and can then update the preset value by receiving MAC-CE signaling from the base station. The terminal can receive one or more d_P values, which are the difference value of the path loss amount, or the d_P'' value, which is the change amount of the d_P value, for each bandwidth portion or each cell. For example, the terminal can receive four d_P values ​​or d_P'' values, which is the maximum number of path loss measurement reference signals that the terminal can track within a specific cell, through upper layer signaling. The terminal can consider at least one combination of the following items as information that can be included in the MAC-CE signaling.

[0678] - Serving cell ID field (e.g. 5 bits)

[0679] - Uplink bandwidth part ID field (e.g. 2 bits)

[0680] - Path loss measurement reference signal ID field (e.g. 6 bits)

[0681] - Path loss measurement reference signal group field (e.g. 2 bits)

[0682] - Activated path loss measurement reference signal ID field (e.g. 2 bits)

[0683] - Path loss difference value (d_P) field (e.g. 5 to 8 bits)

[0684] - Variation of difference value of path loss amount (d_P'') field (e.g. 5 to 8 bits)

[0685] - Joint TCI state or UL TCI state field (7 or 6 bits respectively)

[0686] As an example of a combination of MAC-CE signaling configuration information, if the terminal receives one d_P value, which is the difference value of the path loss amount, or one d_P'' value, which is the change amount of the d_P value, for each bandwidth portion through upper layer signaling, the terminal can expect that the MAC-CE signaling includes a Serving cell ID field, an uplink bandwidth portion ID field, a path loss difference value (d_P) field, or / and a path loss difference value change amount (d_P'') field among the information. The terminal can receive the MAC-CE signaling and update one d_P value, which is the difference value of the path loss amount, or one d_P'' value, which is the change amount of the d_P value, set within the bandwidth portion.

[0687] As another example of a combination of MAC-CE signaling configuration information, if the terminal receives one d_P value, which is the difference value of the path loss, or one d_P'' value, which is the change in the d_P value, for each activated path loss measurement reference signal within the cell through upper layer signaling, the terminal can expect that the MAC-CE signaling includes a Serving cell ID field, an uplink bandwidth part ID field, an activated path loss measurement reference signal ID field, a path loss difference (d_P) field, or / and a path loss difference (d_P'') field among the information. The terminal can receive the MAC-CE signaling to update one d_P value, which is the difference value of the path loss, or one d_P'' value, which is the change in the d_P value, set for a specific activated path loss measurement reference signal within the cell.

[0688] The terminal and the base station additionally define a field indicating the d_P value or d_P'' value within the MAC-CE signaling that changes the path loss measurement reference signal, so that if the terminal receives the MAC-CE, it can change the path loss measurement reference signal and be instructed with the corresponding d_P value or d_P'' value.

[0689] After the terminal receives the MAC-CE from the base station, 3 slots after the PUCCH transmission including HARQ-ACK information for the PDSCH including the MAC-CE, the terminal can update the d_P value, which is the difference value of the path loss amount set by the upper layer signaling, or the d_P'', which is the change amount of the d_P value, to the value received by the MAC-CE signaling and apply it when determining the uplink transmission power.

[0690] In the case where the terminal updates the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change in the d_P value, to the value received through MAC-CE signaling, as in [Method 3-2], the terminal can update the difference value of the path loss amount relatively dynamically in addition to the semi-static setting method, so that it can be useful for compensating for the path loss amount when determining the transmission power of the terminal when the terminal has mobility. However, as described above, the terminal and the base station need to define new MAC-CE signaling, and the base station must be able to periodically measure the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change in the difference value of the path loss amount, and the delay time when exchanging information between TRPs may not be large.

[0691] [Method 3-3]

[0692] 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 in the d_P value, from the base station through upper layer signaling, and can then be instructed through DCI. The terminal can receive one or more d_P values, which are the difference values ​​of the path loss amount, or the d_P'' value, which is the change in the d_P value, for each bandwidth portion or each cell. For example, the terminal can receive four d_P values ​​or d_P'' values, which is the maximum number of path loss measurement reference signals that the terminal can track within a specific cell, through upper layer signaling, and the terminal can update one of the four d_P values ​​to a value received through DCI.

[0693] In one embodiment, the terminal can understand a newly defined terminal group common DCI, additionally define and set an RNTI applicable to the DCI, and receive update information on a d_P value, which is a difference value of the path loss amount, or a d_P'' value, which is a change amount of the d_P value, through the terminal group common DCI.

[0694] In one embodiment, the terminal may be instructed to update information about 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, through a new field in the terminal-specific DCI (e.g., DCI format 0_1, 0_2, 0_3, 1_1, 1_2, or 1_3).

[0695] When the terminal updates 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, through DCI, a method similar to the TPC accumulation or absolute TPC may be used. When the terminal updates 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, through DCI, a method similar to the TPC accumulation may be used. In addition, the d_P value, which is the difference value of the path loss amount set by the upper layer signaling, may be updated by adding the d_P'' value, which is the change amount of the d_P value, through DCI. If the terminal uses a method such as the absolute TPC when updating 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, through DCI, the terminal can replace the d_P value set by the upper layer signaling with the d_P value received through DCI.

[0696] When the terminal performs an update for the d_P value or d_P'' value through DCI, there may be a case where the terminal fails to receive the DCI. Therefore, the terminal may define a HARQ-ACK transmission operation for the corresponding DCI and report to the base station whether or not the DCI has been received for the update for the d_P or d_P'' value. After 3 slots from the PUCCH transmission including the HARQ-ACK information for the corresponding DCI, the terminal may update the d_P value, which is a difference value of the path loss amount set by the upper layer signaling to the terminal, or d_P'', which is a change amount of the d_P value, to a value received through the DCI and apply the update when determining the uplink transmission power. In another way, the terminal can update the d_P value, which is the difference value of the path loss amount set by the upper layer signaling to the terminal after a specific time from the HARQ-ACK information, or the d_P'', which is the change in the d_P value, to a value received through DCI and apply it when determining the uplink transmission power, and the specific time can be reported as the terminal capability.

[0697] In the case where the terminal updates the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change in the d_P value, using the value received through DCI signaling, as in [Method 3-3], the terminal may be able to dynamically update the path loss amount difference value based on DCI in addition to the semi-static setting method, so that when the terminal has mobility, it may be useful for compensating for the path loss amount between the UL-only TRP and the terminal when determining the transmission power of the terminal. However, as described above, the terminal and the base station may need to define additional fields in the DCI, which may result in an increase in DCI overhead. In addition, the base station must be able to periodically measure the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change in the path loss amount difference value, and the delay time when exchanging information between TRPs may not be large.

[0698] [Method 3-4]

[0699] 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 receive two or more CSI-RSs from the base station and implicitly receive the d_P or d_P'' value through the difference in reception power of the corresponding CSI-RSs. The terminal may receive one or more d_P values, which are the difference value of the path loss amount, or the d_P'' value, which is the change amount of the d_P value, for each bandwidth portion or each cell.

[0700] For example, the terminal can be configured with four d_P values ​​or d_P'' values, which is the maximum number of path loss measurement reference signals that the terminal can track within a specific cell, through upper layer signaling, and the terminal can receive an updated value from the base station for one of the four d_P values ​​by receiving CSI-RSs assuming different transmission powers from the base station and implicitly confirming the d_P or d_P'' value by utilizing the difference in the reception power. To this end, the terminal can be configured with CSI-RS resources for updating the corresponding values, depending on the number of d_P values, which are the difference values ​​of the path loss amount set by upper layer signaling, or d_P'' values, which are the change amounts of the d_P values.

[0701] In the case where the terminal updates the d_P value, which is the difference value of the path loss amount, or the d_P'' value, which is the change in the d_P value, by differently setting the transmission power of different CSI-RS resources and using the difference in the reception power values, as in [Method 3-4], the terminal may be able to dynamically update the path loss amount difference value based on DCI in addition to the semi-static setting method, and thus, when the terminal has mobility, it may be useful for compensating for the path loss amount between the UL-only TRP and the terminal when determining the transmission power of the terminal, and in the case where there is no interference signal, the accuracy of information may be high in that the unquantized d_P or d_P'' value can be transmitted to the terminal by using the difference in the transmission power of the CSI-RS resource. However, since the terminal must define CSI-RS resources in which different transmission powers are assumed to update the d_P value or d_P'' value, and the difference between the transmission powers of the corresponding CSI-RS resources can also vary depending on the d_P or d_P'' value calculated at the base station, overhead at the base station may increase.

[0702] [Method 3-5]

[0703] The terminal can receive the d_P or d_P'' value from the base station through a combination of at least one of the above [Method 3-1] to [Method 3-4] and update the preset value. When a specific event defined in the base station occurs, the base station can notify the terminal to update the preset or already activated value by transmitting the d_P or d_P'' value. For example, when the d_P or d_P'' value calculated through the above [Method 2-1] and / or [Method 2-2] changes by a specific ratio or more compared to the previously calculated d_P or d_P'' value (for example, decreases or increases by 10% or more), the base station can transmit the newly calculated d_P or d_P'' value to the terminal to update it. The terminal can receive a timer from the base station. If the base station does not update the difference value of the path loss amount, d_P, or the change amount thereof, d_P'', within the time defined through the timer, the terminal may perform at least one combination of the following:

[0704] - The terminal can request the base station to update the d_P or d_P'' value.

[0705] - The terminal can perform uplink transmission to the base station without applying the d_P or d_P'' value.

[0706] - The terminal can perform uplink transmission to the base station by applying the d_P value or d_P'' value initially received from the base station.

[0707] - The terminal may determine that a radio link failure has occurred and request the base station to reset upper layer signaling.

[0708] The terminal may be notified from the base station of at least one combination of [Method 3-1] to [Method 3-5] through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, or may expect that at least one combination of [Method 3-1] to [Method 3-5] is fixedly defined in the standard. Additionally, if the terminal is notified from the base station of a combination of at least one specific method through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, it may mean that the terminal cannot support at least one other combination of specific methods.

[0709] For example, the terminal can expect that the above [Method 3-2] is fixedly defined in the standard for the method of updating the difference value of the path loss amount. As another example, the terminal can be notified of the above [Method 3-1] from the base station through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the terminal can consider that the base station has notified that the above [Method 3-2] is not supported.

[0710] The terminal may report to the base station, based on the terminal capability, whether it can support at least one combination of [Method 3-1] to [Method 3-5]. If the terminal reports to the base station, based on the terminal capability, that it can support a combination of one or more specific methods, it may be regarded as reporting that the terminal cannot support one or more other combinations of methods. For example, the terminal may report to the base station, based on the terminal capability, whether it can support [Method 3-1] or [Method 3-2]. As another example, the terminal may report to the base station that it can support [Method 3-1], and this terminal capability report may mean that the terminal cannot support [Method 3-2].

[0711] FIG. 16 is a diagram illustrating the operation of a terminal for uplink transmission power control according to one embodiment of the present disclosure.

[0712] Referring to FIG. 16, in step 1600, a terminal may transmit terminal capabilities (e.g., terminal capability signaling) to a base station. The terminal capability signaling that may be reported may include a combination of at least one of terminal capabilities related to PUSCH, PUCCH, SRS transmission and transmission power parameters, terminal capabilities related to integrated TCI state operation, and terminal capabilities corresponding to [Method 2-1], [Method 2-2], [Method 3-1] to [Method 3-5]. Step 1600 may also be omitted.

[0713] In step 1605, the terminal may receive upper layer signaling from the base station according to the reported terminal capability. The terminal may define upper layer parameters for at least one combination of upper layer signaling related to PUSCH, PUCCH, SRS transmission and transmission power parameters, upper layer signaling related to integrated TCI state operation, and upper layer signaling related to support of [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-5], and use one of them.

[0714] In step 1610, the terminal may transmit an uplink signal to the base station. The terminal may use a combination of at least one of [Method 2-1] and [Method 2-2] as a method for transmitting the uplink signal.

[0715] In step 1615, the terminal may be notified of a signaling from the base station instructing an update of path loss-related information. The terminal may receive a signaling from the base station instructing an update of path loss-related information using at least one combined method from [Method 3-1] to [Method 3-5].

[0716] At step 1620, the terminal can perform uplink transmission for UL-only TRP based on the updated path loss information.

[0717] 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.

[0718] FIG. 17 is a diagram illustrating the operation of a base station for uplink transmission power control according to one embodiment of the present disclosure.

[0719] Referring to FIG. 17, in step 1700, the base station may receive terminal capabilities (e.g., terminal capability signaling) from the terminal. The terminal capability signaling that may be received by the base station may include a combination of at least one of terminal capabilities related to PUSCH, PUCCH, SRS transmission and transmission power parameters, terminal capabilities related to integrated TCI state operation, and terminal capabilities corresponding to [Method 2-1], [Method 2-2], [Method 3-1] to [Method 3-5]. Step 1700 may also be omitted.

[0720] In step 1705, the base station may transmit upper layer signaling to the terminal according to the terminal capability reported by the terminal. The terminal may define upper layer parameters for at least one combination of upper layer signaling related to PUSCH, PUCCH, SRS transmission and transmission power parameters, upper layer signaling related to integrated TCI state operation, and upper layer signaling related to support of [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-5], and use one of them.

[0721] In step 1710, the base station may receive an uplink signal from the terminal. The base station may expect the terminal to transmit the uplink signal through a combination of at least one of [Method 2-1] and [Method 2-2].

[0722] In step 1715, the base station may transmit a signal to the terminal instructing the terminal to update the path loss-related information. The base station may transmit a signal to the terminal instructing the terminal to update the path loss-related information using at least one combined method from [Method 3-1] to [Method 3-5].

[0723] At step 1720, the base station may expect and receive the terminal to perform uplink transmission for UL-only TRP based on the updated path loss information.

[0724] 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.

[0725] <Example 4: Uplink scheduling method based on difference values ​​of path loss amounts>

[0726] As one embodiment of the present disclosure, a method for scheduling uplink transmissions for UL-only TRP is described by indicating a path loss difference value to a terminal. This embodiment can be operated in combination with other embodiments.

[0727] In the present disclosure, the difference value of the path loss amount may be named pathloss offset, PL offset, path loss amount offset, or path loss amount offset.

[0728] As described above, the terminal can set the difference value of the path loss amount from the base station as an upper layer signaling. Since the terminal cannot receive the path loss measurement reference signal from the UL-only TRP, the path loss amount between the terminal and the UL-only TRP cannot be directly measured. Therefore, the terminal can indirectly calculate the path loss amount from the UL-only TRP by applying the difference value of the path loss amount to the path loss amount calculated based on the path loss measurement reference signal received from the TRP capable of both uplink and downlink operations.

[0729] A terminal can receive an uplink scheduling from a base station, and can distinguish whether the uplink scheduling is a transmission for a UL-only TRP or a transmission for a TRP capable of both uplink and downlink operations based on information included in the uplink scheduling. The uplink scheduling may include information related to a difference value of path loss amounts. In this way, a method for a terminal to receive an uplink scheduling including information related to a difference value of path loss amounts from a base station may consider a combination of at least one of the following items.

[0730] [Method 4-1]

[0731] A terminal may receive one or more joint TCI states or UL TCI states from a base station via upper layer signaling. In one embodiment, as shown in [Table 30] below, the terminal may receive information on the difference in path loss within one or more joint TCI states or UL TCI states.

[0732] [Table 30]

[0733]

[0734] In the above [Table 30], 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.

[0735] - In one embodiment, Xs and Xe can be 0 and natural numbers (for example, 0 and 30, respectively), and the value of pathlossOffset can be in units of 1 dB. The reason why negative values ​​of pathlossOffset are not considered is that when a terminal considers multiple UL-only TRPs, it is assumed that the distance between the terminal and the UL-only TRP is closer than the distance between the TRPs that can operate in uplink and downlink, and thus a higher reception signal quality can be assumed when receiving from the UL-only TRP during uplink transmission of the terminal.

[0736] - In one embodiment, Xs and Xe can be integers including positive and negative numbers (for example, -10 and 50, respectively), and the value of pathlossOffset can be in units of 1 dB. The reason why the value of pathlossOffset can be considered up to a negative number is that when the terminal considers multiple UL-only TRPs, the distance between the terminal and some UL-only TRPs is considered to be longer than the distance between the terminal and the TRPs that can operate in uplink and downlink, so that even if the terminal receives a low reception signal quality in some UL-only TRPs during uplink transmission, if the same signal is received in multiple UL-only TRPs, a diversity effect can be obtained.

[0737] - In one embodiment, Xs and Xe may be 2 and 32, respectively, and the value of pathlossOffset may be in units of 2 dB. The range and unit of such values ​​may be borrowed from the range and unit of differential RSRP (reference signal received power) values ​​that the terminal can report to the base station. When the terminal reports L1-RSRP (layer 1 RSRP), which is one of the channel state information that can indicate the strength of the received signal, the largest value among the L1-RSRP corresponding to the number of values ​​set by the upper layer signaling to the terminal may be quantized into 7 bits and reported in the range from -140 dBm to 44 dBm in units of 1 dB, and one or more L1-RSRP values ​​smaller than that may be calculated and reported as differential RSRPs that can be expressed as differences with respect to the largest value. The terminal may quantize the differential RSRP value into 4 bits and report the range of the value from 2 dB to 32 dB in units of 2 dB. Path loss is calculated by calculating the difference between the RSRP value calculated by the terminal and the transmission power value of the reference signal that can be received from the base station for calculating the path loss. If the differential value of the path loss is calculated, the range and unit of the differential RSRP value can be reused.

[0738] A terminal can define ULonlyNode as a condition under which the pathlossOffset can be set by the base station in the joint TCI state or the UL TCI state. The condition ULonlyNode can mean that the terminal operates in a cell containing a UL-only TRP, which can mean when a specific upper layer signaling is set. That is, when a specific upper layer signaling is set, the terminal can optionally receive the pathlossOffset. The name of this condition ULonlyNode is only an example and can be expressed by other names. If the terminal does not receive the pathlossOffset set in the joint TCI state or the UL TCI state, the terminal can regard the difference value of the path loss amount as 0.

[0739] The terminal may be instructed by the base station to use the TCI state field in the DCI for one or more of the joint TCI states or UL TCI states set as in [Table 30]. If the terminal receives the joint TCI state or UL TCI state with the pathlossOffset set and receives scheduling from the base station to perform uplink transmission by applying the joint TCI state or UL TCI state, the terminal may regard the uplink transmission as transmission for UL-only TRP.

[0740] When calculating the transmission power for the above uplink transmission, the terminal may calculate the path loss between the terminal and the UL-only TRP by applying the difference value of the path loss indicated by the pathlossOffset value set in the joint TCI state or the UL TCI state in addition to the path loss measured through the path loss measurement reference signal (for example, pathlossReferenceRS-Id-r17 in the above [Table 30]) set in the joint TCI state or the UL TCI state. It may be assumed that the terminal has received the path loss measurement reference signal (for example, pathlossReferenceRS-Id-r17 in the above [Table 30]) from a TRP capable of operating in both uplink and downlink.

[0741] When using the above [Method 4-1], since the terminal can receive the difference values ​​of different path losses for each TCI state from the base station, even if the same path loss reference signal is set in each TCI state using different TCI states, the terminal can calculate different path losses using the difference values ​​of different path losses set in each TCI state. Through the above method, if one or more UL-only TRPs are installed in the network to which the terminal is connected, the terminal can easily use the difference values ​​of multiple path losses. However, when the terminal uses the above method, the difference values ​​of path losses that the terminal and the base station must manage increase, and since the updates for these must be supported for each TCI state, a lot of signaling overhead may be consumed.

[0742] [Method 4-2]

[0743] 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 BWP-UplinkDedicated, which is upper layer signaling for the uplink bandwidth, and each difference value for path loss can be connected 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 31] below is one example that can express the above method, and the connection between the difference values ​​for path loss and the groups of path loss measurement reference signals may not be limited thereto.

[0744] [Table 31]

[0745]

[0746]

[0747] In the above [Table 31], the terminal can receive multiple pathlossReferenceRSGroup-r19, which is an upper layer signaling, within BWP-UplinkDedicated corresponding to the uplink bandwidth portion, and can configure a pathlossOffsetList through this. Each pathlossReferenceRSGroup can include pathlossReferenceRSGroupId, which can indicate the ID of the pathlossReferenceRSGroup, pathlossOffset, which can mean a difference value of path loss that can be applied to one or more path loss measurement reference signals included in the pathlossReferenceRSGroup, and pathlosReferenceRSList, which can mean a list of one or more path loss measurement reference signals included in the pathlossReferenceRSGroup. The terminal can consider the following matters with respect to the pathlossOffset, which is the upper layer signaling.

[0748] - The terminal can set the 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.

[0749] - In one embodiment, Xs and Xe can be 0 and natural numbers (for example, 0 and 30, respectively), and the value of pathlossOffset can be in units of 1 dB. The reason why negative values ​​of pathlossOffset are not considered is that when a terminal considers multiple UL-only TRPs, it is assumed that the distance between the terminal and the UL-only TRP is closer than the distance between the TRPs that can operate in uplink and downlink, and thus a higher reception signal quality can be assumed when receiving from the UL-only TRP during uplink transmission of the terminal.

[0750] - In one embodiment, Xs and Xe can be integers including positive and negative numbers (for example, -10 and 50, respectively), and the value of pathlossOffset can be in units of 1 dB. The reason why the value of pathlossOffset can be considered up to a negative number is that when the terminal considers multiple UL-only TRPs, the distance between the terminal and some UL-only TRPs is considered to be longer than the distance between the terminal and the TRPs that can operate in uplink and downlink, so that even if the terminal receives a low reception signal quality in some UL-only TRPs during uplink transmission, if the same signal is received in multiple UL-only TRPs, a diversity effect can be obtained.

[0751] - In one embodiment, Xs and Xe may be 2 and 32, respectively, and the value of pathlossOffset may be in units of 2 dB. The range and unit of such values ​​may be borrowed from the range and unit of differential RSRP values ​​that the terminal can report to the base station. When the terminal reports L1-RSRP, which is one of the channel state information that can indicate the strength of the received signal, the largest value among the L1-RSRP corresponding to the number set by the upper layer signaling to the terminal may be quantized into 7 bits and reported in the range from -140 dBm to 44 dBm in units of 1 dB, and one or more L1-RSRP values ​​smaller than that may be reported by calculating differential RSRP that can be expressed as a difference value with respect to the largest value, and the differential RSRP value may be quantized into 4 bits and the range of the value may be reported in the range from 2 dB to 32 dB in units of 2 dB. Path loss is calculated by calculating the difference between the RSRP value calculated by the terminal and the transmission power value of the reference signal that can be received from the base station for calculating the path loss. If the differential value of the path loss is calculated, the range and unit of the differential RSRP value can be reused.

[0752] In the above [Table 31], the terminal can be configured with the upper layer signaling enablePathlossOffset within the joint TCI state or the UL TCI state. The terminal can be configured with the enablePathlossOffset from the base station under the condition of ULonlyNode1. ULonlyNode1 can mean that at least one of the upper layer signaling pathlossReferenceRSGroups is configured, or that a specific upper layer signaling that means operating with multiple TRPs including UL-only TRPs is configured for the terminal. The name of this condition ULonlyNode1 is only an example and can be expressed with other names.

[0753] In one embodiment, the terminal may consider a condition such as Need R without a condition such as ULonlyNode1 for the enablePathlossOffset. The upper layer signaling enablePathlossOffset may have a value of enabled, and if the terminal receives the upper layer signaling enablePathlossOffset as enabled in the joint TCI state or UL TCI state as in [Table 31], the terminal may determine or calculate the final path loss by applying the pathlossOffset set in the pathlossReferenceRSGroup that includes the path loss measurement reference signal (for example, pathlossReferenceRS-Id-r17) set in the same joint TCI state or UL TCI state in addition to the path loss measured through the path loss measurement reference signal. The name of the condition ULonlyNode1 is only an example and may be expressed by other names.

[0754] If the terminal does not set the enablePathlossOffset in the joint TCI state or the UL TCI state, the terminal may regard the difference value of the path loss as 0, or may regard the pathlossOffset set in the pathlossReferenceRSGroup as not being applied to the path loss measurement reference signal (e.g., pathlossReferenceRS-Id-r17) indicated through the corresponding TCI state. For example, the terminal may receive up to 64 path loss measurement reference signals per cell through upper layer signaling, but may track up to 4 of these path loss measurement reference signals, and therefore the number of the above-described pathlossReferenceRSGroups may be up to 4.

[0755] When using the above [Method 4-2], if the network to which the terminal is connected has one or more UL-only TRPs installed, the terminal can easily use the difference values ​​of multiple path loss amounts by using different pathlossReferenceRSGroups, and since the above-described path loss difference values ​​can also be updated for each pathlossReferenceRSGroup, the management thereof can be easy. However, the terminal needs to newly configure the upper layer signaling called pathlossReferenceRSGroup with the base station.

[0756] [Method 4-3]

[0757] The terminal can receive one or more joint TCI states or UL TCI states from the base station through upper layer signaling, and the terminal can receive one path loss difference value within the BWP-UplinkDedicated, which is an upper layer signaling for the uplink bandwidth. Depending on how the terminal operates with multiple TRPs, it can be assumed that the path loss difference value is always applied to a specific TCI state.

[0758] For example, if the terminal operates with multiple TRPs based on the multi-DCI method, the terminal does not apply the difference value of the path loss amount to the TCI state indicated through the DCI transmitted to the terminal within the control resource set in which the upper layer signaling coresetPoolIndex is set to 0, and, for the TCI state indicated through the DCI transmitted to the terminal within the control resource set in which the upper layer signaling coresetPoolIndex is set to 1, the terminal may determine the final path loss amount by applying the difference value of the set path loss amount to the path loss amount calculated using pathlossReferenceRS-Id-r17 indicated through the TCI state.

[0759] As another example, if the terminal operates in multiple TRPs based on the single-DCI method, the terminal may not apply the difference value of the path loss amount to the first TCI state among the two TCI states indicated through the DCI, and may apply the difference value of the set path loss amount to the path loss amount calculated using pathlossReferenceRS-Id-r17 indicated through the corresponding TCI state for the second TCI state to determine the final path loss amount. The following [Table 31] may be one example that may express the method, but may not be limited thereto.

[0760] [Table 32]

[0761]

[0762] The terminal can define ULonlyNode2 as a condition for the pathlossOffset to be set by the base station within the upper layer signaling, BWP-UplinkDedicated. The condition ULonlyNode2 can mean that the terminal operates within a cell containing a UL-only TRP, which can mean when a specific upper layer signaling is set. That is, the terminal can optionally receive the pathlossOffset when a specific upper layer signaling is set. The name of this condition ULonlyNode2 is only an example and can be expressed by other names.

[0763] In one embodiment, the terminal may consider conditions such as Need R without conditions such as ULonlyNode2 for the pathlossOffset. If the terminal does not set the pathlossOffset in BWP-UplinkDedicated, the terminal may consider the difference value of the path loss amount as 0.

[0764] The terminal may consider the following for the upper layer signaling, pathlossOffset.

[0765] - The terminal can set the 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.

[0766] - In one embodiment, Xs and Xe can be 0 and natural numbers (for example, 0 and 30, respectively), and the value of pathlossOffset can be in units of 1 dB. The reason why negative values ​​of pathlossOffset are not considered is that when a terminal considers multiple UL-only TRPs, it is assumed that the distance between the terminal and the UL-only TRP is closer than the distance between the TRPs that can operate in uplink and downlink, and thus a higher reception signal quality can be assumed when receiving from the UL-only TRP during uplink transmission of the terminal.

[0767] - In one embodiment, Xs and Xe can be integers including positive and negative numbers (for example, -10 and 50, respectively), and the value of pathlossOffset can be in units of 1 dB. The reason why the value of pathlossOffset can be considered up to a negative number is that when the terminal considers multiple UL-only TRPs, the distance between the terminal and some UL-only TRPs is considered to be longer than the distance between the terminal and the TRPs that can operate in uplink and downlink, so that even if the terminal receives a low reception signal quality in some UL-only TRPs during uplink transmission, if the same signal is received in multiple UL-only TRPs, a diversity effect can be obtained.

[0768] - In one embodiment, Xs and Xe may be 2 and 32, respectively, and the value of pathlossOffset may be in units of 2 dB. The range and unit of such values ​​may be borrowed from the range and unit of differential RSRP values ​​that the terminal can report to the base station. When the terminal reports L1-RSRP, which is one of the channel state information that can indicate the strength of the received signal, the largest value among the L1-RSRP corresponding to the number set by the upper layer signaling to the terminal may be quantized into 7 bits and reported in the range from -140 dBm to 44 dBm in units of 1 dB, and one or more L1-RSRP values ​​smaller than that may be reported by calculating differential RSRP that can be expressed as a difference value with respect to the largest value, and the differential RSRP value may be quantized into 4 bits and the range of the value may be reported in the range from 2 dB to 32 dB in units of 2 dB. Path loss is calculated by calculating the difference between the RSRP value calculated by the terminal and the transmission power value of the reference signal that can be received from the base station for calculating the path loss. If the differential value of the path loss is calculated, the range and unit of the differential RSRP value can be reused.

[0769] When using the above [Method 4-3], the terminal can reuse the existing TCI state structure because the terminal does not include information related to the difference value of the path loss amount in the TCI state. However, when using the above [Method 4-3], if there are multiple TRPs capable of uplink and downlink operations in the cell to which the terminal is connected, and there are also multiple TRPs capable of only uplink reception operations, the terminal can assume that, in the case of the above [Method 4-3], the difference value of the path loss amount is always applied to a specific TCI state (for example, in the multi-DCI-based multi-TRP operation, it may be a TCI state indicated through DCI transmitted from a control resource set in which coresetPoolIndex is set to 1, and in the single-DCI-based multi-TRP operation, it may be a second TCI state indicated through DCI).

[0770] When a terminal operates in uplink multi-TRP mode from a base station, the terminal may not be able to dynamically switch between scheduling that uses two different TRPs capable of uplink and downlink operations and scheduling that includes at least one TRP capable of only uplink reception operations. That is, the terminal may be assumed to be connected to a TRP capable of uplink reception operations semi-statically within the cell. If the network to which the terminal is connected has one or more UL-only TRPs installed, the method of setting the difference value of one path loss amount as in [Method 4-3] may not be appropriate.

[0771] [Method 4-4]

[0772] The terminal can receive a path loss difference value from the base station via upper layer signaling. The path loss difference value setting may vary by bandwidth segment, or may vary by cell, so that the same value is set for all bandwidth segments within a cell. When a path loss difference value is set, the terminal can expect a new field to be included in the DCI indicating whether to apply the path loss difference value.

[0773] The terminal can distinguish, through the new field in the DCI, whether the uplink transmission from the base station through the DCI is for a UL-only TRP or for a TRP capable of both uplink and downlink operations. The new field may be 1 bit, and if its value is 1, the difference value of the path loss amount may be applied when determining the path loss amount within the transmission power for the uplink transmission, and the uplink transmission may be regarded as for a UL-only TRP, and if its value is 0, the difference value of the path loss amount may not be applied for the uplink transmission, and the uplink transmission may be regarded as for a TRP capable of operating in both uplink and downlink.

[0774] Since the terminal can set and use the difference value of one path loss amount, the signaling exchange between the terminal and the base station can be relatively simplified from the perspective of managing the difference value of the path loss amount. In addition, depending on the characteristics of the integrated TCI state, when the terminal is instructed to enter a specific TCI state, it can be applied from a specific time and maintained until a new TCI state is instructed and applied. In this way, the terminal can dynamically switch, based on DCI, between uplink transmission for UL-only TRP and uplink transmission for TRP that can operate in both uplink and downlink without being instructed about a new TCI state. However, when considering the difference value of one path loss amount, there may be a problem if more than one UL-only TRP is considered.

[0775] 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 portion, or may vary by cell, so that the same value is set for all bandwidth portions within the cell. When the path loss difference value is set, the terminal can expect that a new field indicating whether the path loss difference value is applied is included in the DCI. Through the new field in the DCI, the terminal can distinguish whether the uplink transmission is for a UL-only TRP from an uplink transmission for a TRP that allows both uplink and downlink operations through the DCI from the base station, and it can mean an additional offset of a specific value from the single path loss difference value set by the upper layer signaling.

[0776] The above new field may be 2 bits, and if its value is 00, the difference value of the path loss amount set by the upper layer signaling may be applied when determining the path loss amount within the transmission power for the uplink transmission (i.e., it may be considered that no additional offset is applied from the difference value of the path loss amount set by the upper layer signaling). If its value is 01, 10, or 11, the terminal may assume that the additional offset from the difference value of the path loss amount set by the upper layer signaling is considered to determine the final difference value of the path loss amount, and if its value is 01, 10, or 11, -3dB, 1dB, or 3dB may be applied, respectively.

[0777] Alternatively, the new field in the DCI may be 2 bits, and if the value is 00, the difference value of the path loss amount may not be applied, and if the value is 11, the difference value of the path loss amount set by the upper layer signaling may be applied when determining the path loss amount within the transmission power for the uplink transmission (i.e., it may be considered that no additional offset is applied from the difference value of the path loss amount set by the upper layer signaling), and if the value is 01 or 10, the terminal may assume that an additional offset from the difference value of the path loss amount set by the upper layer signaling is considered to determine the final difference value of the path loss amount, and in the case of 01 or 10, -3dB or 3dB may be applied, respectively.

[0778] Since a terminal can receive and use a single path loss difference value while additionally compensating for the path loss difference value through DCI, it can utilize a relatively accurate path loss difference value compared to using only the value set by upper-layer signaling in cases where the terminal has high mobility. However, indicating such an accurate path loss difference value may have the disadvantage of increasing additional DCI overhead.

[0779] A terminal may receive one or more path loss difference values ​​from the base station via upper-layer signaling. These path loss difference values ​​may vary by bandwidth segment, or may be cell-specific, with the same value set for all bandwidth segments within a cell. If a path loss difference value is set, the terminal can expect a new field to be included in the DCI indicating whether to apply the path loss difference value.

[0780] The terminal can distinguish, through the new field in the DCI, whether the uplink transmission is for a UL-only TRP from the base station through the DCI or for an uplink transmission for a TRP capable of both uplink and downlink operations. The new field can be expressed as a number of bits that can express the number of difference values ​​of the configured path loss amount, and can convey a specific difference value of the path loss amount for each code point, and can mean that at least one of all code points does not apply the difference value of the path loss amount.

[0781] Since the terminal can set and use the difference values ​​of multiple path losses, from the perspective of managing the difference values ​​of path losses, signaling exchange between the terminal and the base station may be relatively increased compared to managing a single path loss amount. However, when considering the difference values ​​of multiple path losses, it may be advantageous to consider more than one UL-only TRP.

[0782] [Method 4-5]

[0783] The terminal may consider at least one combined method among the above [Method 4-1] to [Method 4-4].

[0784] For example, the terminal may consider a method that combines the above [Method 4-2] and the above [Method 4-3].

[0785] - The terminal can receive multiple pathlossreferenceRSGroups as set by upper layer signaling as in the above [Method 4-2], and can recognize the connection relationship between pathlossOffset, which can mean the difference value of path loss amount through pathlossreferenceRSGroup, and pathlossReferenceRSList, which is composed of one or more path loss amount measurement reference signals (e.g., PathlossReferenceRS-Id-r17).

[0786] - The terminal may assume that the difference value of the path loss amount is applied to a specific TCI state as in the above [Method 4-3]. For example, if the terminal operates with multiple TRPs based on the multi-DCI method, the terminal does not apply the difference value of the path loss amount to the TCI state indicated through the DCI transmitted to the terminal within the control resource set in which the upper layer signaling coresetPoolIndex is set to 0, and, for the TCI state indicated through the DCI transmitted to the terminal within the control resource set in which the upper layer signaling coresetPoolIndex is set to 1, the terminal may determine the final path loss amount by applying the difference value of the set path loss amount to the path loss amount calculated using pathlossReferenceRS-Id-r17 indicated through the corresponding TCI state. As another example, if the terminal operates in multiple TRPs based on the single-DCI method, the terminal may not apply the difference value of the path loss amount to the first TCI state among the two TCI states indicated through the DCI, and may apply the difference value of the set path loss amount to the path loss amount calculated using pathlossReferenceRS-Id-r17 indicated through the corresponding TCI state for the second TCI state to determine the final path loss amount.

[0787] - The terminal can apply different path loss difference values ​​depending on which pathlossreferenceRSGroup the path loss measurement reference signal indicated by the TCI state is included in, for a specific TCI state considered in the above [Method 4-3], through a connection relationship between the pathlossOffset, which may mean the difference value of the path loss amount considered in the above [Method 4-2], and the pathlossReferenceRSList, which is composed of one or more path loss measurement reference signals (e.g., PathlossReferenceRS-Id-r17). In addition, some of the path loss measurement reference signals are set not to be included in the above pathlossreferenceRSGroup, so that even if a specific TCI state considered in the above [Method 4-3] is indicated, the difference value of the path loss amount may not be applied in some cases.

[0788] For example, if a terminal operates with multiple TRPs based on the multi-DCI method, and pathlossReferenceRS-Id-r17 in the TCI state indicated through DCI transmitted to the terminal within a control resource set in which coresetPoolIndex, which is an upper layer signaling, is set to 1, is not included in any of the one or more set pathlossreferenceRSGroups, then the terminal may not apply the pathloss difference value to the uplink signal corresponding to the specific TCI state because the pathlossReferenceRS-Id-r17 does not have a difference value for the amount of the connected path loss. As another example, if the terminal operates in multi-TRP based on the single-DCI method, and the pathlossReferenceRS-Id-r17 in the second TCI state indicated through the DCI is not included in any of the one or more configured pathlossreferenceRSGroups, the terminal may not apply the pathloss difference value to the uplink signal corresponding to the specific TCI state because the pathlossReferenceRS-Id-r17 does not have a difference value for the amount of path loss associated with it.

[0789] - When using a combined method like this, the terminal can operate the difference values ​​of multiple path losses without changing the TCI state structure, which can facilitate scheduling reception in a cell where multiple UL-only TRPs are installed, and since the difference values ​​of path losses do not always have to be applied for a specific TCI state, it may not be necessary to consider the constraint that scheduling for UL-only TRPs must be included semi-statically, which can be advantageous for receiving flexible scheduling.

[0790] As another example, the terminal may consider a method that combines the above [Method 4-3] and the above [Method 4-4].

[0791] - The terminal can set one difference value of path loss amount through upper layer signaling as in [Method 4-3] above, and can apply or not apply the path loss amount for a specific TCI state.

[0792] ...

Claims

1. In a method of a terminal for uplink transmission in a wireless communication system, An operation of receiving information from a base station for the terminal to support a transmit and receive point (TRP) (UL-only TRP) that supports only an uplink reception function through higher layer signaling; A method comprising: receiving TCI (transmission configuration indicator) state information related to the UL-only TRP from the base station; and transmitting an uplink signal based on information for the terminal to support the UL-only TRP and the TCI state information.

2. In paragraph 1, A method further comprising an operation of using a separate TCI state method among the integrated TCI states to support the above UL-only TRP.

3. In paragraph 1, A method further comprising an operation of using a joint TCI state method among integrated TCI states to support the UL-only TRP when the terminal operates in FR1 (frequency range 1).

4. In paragraph 1, An operation of receiving information related to a method of determining uplink transmission power associated with a plurality of transmit and receive points (TRPs) from the base station; An operation of transmitting an uplink signal to the plurality of TRPs; An operation of receiving a signaling instructing an update of path loss related information from the base station; and A method further comprising an operation of performing uplink transmission for the UL-only TRP among the TRPs based on the signaling.

5. In paragraph 1, An operation of receiving uplink transmission scheduling information from the base station; An operation for determining whether the above uplink transmission scheduling information includes information related to a difference value of path loss; An operation of performing a first uplink transmission when the uplink transmission scheduling information includes information related to a difference value of a path loss amount; and A method further comprising an operation of performing a second uplink transmission when the uplink transmission scheduling information does not include information related to a difference value of a path loss amount.

6. In paragraph 1, A method further comprising receiving a TCI state activation indication related to the UL-only TRP from the base station.

7. A method of a base station for scheduling uplink transmission in a wireless communication system, An operation of transmitting information to a terminal to support a transmit and receive point (TRP) (UL-only TRP) that supports only an uplink reception function through higher layer signaling; An operation of transmitting TCI (transmission configuration indicator) state information related to the UL-only TRP to the terminal; and A method comprising an operation of receiving an uplink signal based on the TCI status information through the UL-only TRP.

8. In paragraph 7, An operation of transmitting information related to a method of determining uplink transmission power associated with a plurality of TRPs (transmit and receive points) to the terminal; An operation of receiving uplink signals from the terminal through the plurality of TRPs; and A method further comprising an action of transmitting a signaling indicating an update of path loss related information to the terminal after receiving the above uplink signals.

9. In a terminal for uplink transmission in a wireless communication system, Transmitter and receiver; and A control unit comprising: Through higher layer signaling, the terminal receives information from the base station to support a transmit and receive point (TRP) (UL-only TRP) that supports only uplink reception function, Receive TCI (transmission configuration indicator) state information related to the above UL-only TRP from the base station, A terminal that controls the terminal to transmit an uplink signal based on information for supporting the UL-only TRP and the TCI status information.

10. In paragraph 9, the control unit, A terminal that uses a separate TCI state method among the integrated TCI states to support the above UL-only TRP.

11. In paragraph 9, the control unit, A terminal that uses a joint TCI state method among integrated TCI states to support the UL-only TRP when the terminal operates in FR1 (frequency range 1).

12. In paragraph 9, the control unit, Receive information related to a method for determining uplink transmission power associated with multiple TRPs (transmit and receive points) from the base station, Control to transmit an uplink signal to the above plurality of TRPs, Receive signaling from the base station instructing update of path loss related information, A terminal that performs uplink transmission for the UL-only TRP among the TRPs based on the above signaling.

13. In paragraph 9, the control unit, Receive uplink transmission scheduling information from the base station, Determine whether the above uplink transmission scheduling information includes information related to the difference value of the path loss amount, If the above uplink transmission scheduling information includes information related to the difference value of the path loss amount, the first uplink transmission is performed, A terminal that performs a second uplink transmission when the above uplink transmission scheduling information does not include information related to the difference value of the path loss amount.

14. In paragraph 9, the control unit, A terminal receiving a TCI state activation instruction related to the UL-only TRP from the base station.

15. In a base station for scheduling uplink transmission in a wireless communication system, Transmitter and receiver; and A control unit comprising: Controls the transmission of information to the terminal to support a TRP (transmit and receive point) (UL-only TRP) that supports only uplink reception function through higher layer signaling, Control to transmit TCI (transmission configuration indicator) state information related to the above UL-only TRP to the terminal, A base station that receives an uplink signal based on the TCI status information through the UL-only TRP.

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