Method and device for uplink transmission and reception in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. This method for uplink transmission of a UE in a wireless communication system may comprise the operations of: receiving, from a base station through higher layer signaling, a control message including configuration information pertaining to uplink transmission and support information about a transmit and receive point (TRP) capable of only uplink reception; transmitting an uplink message to the base station on the basis of the control message; and receiving, from the base station, a difference value of a path loss amount or a requirement for receiving an update notification of the path loss amount.

Description

Uplink transmission and reception method and device in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and more particularly, to an uplink transmission / reception method 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] According to one embodiment, a method for uplink transmission of a terminal (UE) in a wireless communication system may include receiving, from a base station, a control message including configuration information regarding uplink transmission and support information regarding a transmit and receive point (TRP) capable of only uplink reception through upper layer signaling; transmitting an uplink message to the base station based on the control message; and receiving, from the base station, a requirement for receiving a difference value of a path loss amount or an update notification of the path loss amount.

[0014] According to one embodiment, a method for scheduling uplink transmission of a base station in a wireless communication system may include: transmitting, to a terminal (UE), a control message including configuration information regarding uplink transmission and support information regarding a transmit and receive point (TRP) capable of only uplink reception, through upper layer signaling; receiving, from the terminal (UE), an uplink message generated based on the control message; and transmitting, to the terminal (UE), a requirement for receiving a difference value of a path loss amount or an update notification of the path loss amount.

[0015] According to one embodiment, a terminal (UE) performing uplink transmission in a wireless communication system may include a transceiver; and a processor coupled to the transceiver. The processor may receive, from a base station, a control message including configuration information regarding uplink transmission and support information regarding a transmit and receive point (TRP) capable of only uplink reception through upper layer signaling, and control transmission of an uplink message to the base station based on the control message, and receive, from the base station, a requirement for receiving a difference value of a path loss amount or an update notification of the path loss amount.

[0016] According to one embodiment, a base station for scheduling uplink transmission in a wireless communication system may include a transceiver; and a processor coupled to the transceiver. The processor may control, through upper layer signaling, to transmit to a terminal (UE) a control message including configuration information regarding uplink transmission and support information regarding a transmit and receive point (TRP) capable of only uplink reception, and to receive, from the terminal (UE), an uplink message generated based on the control message, and to transmit to the terminal (UE) a requirement for receiving a difference value of a path loss amount or an update notification of the path loss amount.

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

[0018] The disclosed embodiment can support uplink transmission considering path loss 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. 4 is a diagram 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. 5 is a diagram illustrating a beam application time 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] Figure 9 is a diagram illustrating a process for beam setting and activation of PDSCH.

[0028] FIG. 10 is a diagram illustrating an example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0029] FIG. 11 is a diagram illustrating an example of configuring downlink control information (DCI) for cooperative communication in a wireless communication system according to one embodiment of the present disclosure.

[0030] Fig. 12 is a diagram showing an Enhanced PDSCH TCI state activation / deactivation MAC-CE structure.

[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 determining an uplink transmission method according to one embodiment of the present disclosure.

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

[0036] FIG. 18 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.

[0037] FIG. 19 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.

[0038] FIG. 20 is a diagram illustrating requirements of a terminal for receiving a difference value of path loss according to one embodiment of the present disclosure.

[0039] FIG. 21 is a diagram showing operations according to whether requirements of a terminal and a base station are satisfied for indicating and updating a difference value of a path loss amount according to one embodiment of the present disclosure.

[0040] FIG. 22 is a diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0041] FIG. 23 is a diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0042] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0043] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0044] 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.

[0045] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout the specification.

[0046] 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 through some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0047] 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).

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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).

[0053] 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 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 20 MHz transmission bandwidth in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by utilizing a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz bands.

[0054] 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.

[0055] Finally, URLLC refers to cellular-based wireless communication services used for specific mission-critical purposes. Examples include remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, URLLC communications must offer extremely low latency and high reliability. For example, URLLC-enabled services must meet air interface latency requirements of less than 0.5 milliseconds and a packet error rate (PER) of 10-5 or lower. Therefore, for services supporting URLLC, 5G systems must provide shorter Transmit Time Intervals (TTIs) than other services, and design considerations may require the allocation of extensive resources in the frequency band to ensure communication link reliability.

[0056] 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.

[0057] In this disclosure, “a / b” may be understood as at least one of a or b.

[0058] [NR time-frequency resources]

[0059] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 ( ) 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.

[0064] 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 can be defined as [Table 1] below.

[0065] [Table 1]

[0066]

[0067] [Bandwidth Part (BWP)]

[0068] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0069] 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.

[0070] 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.

[0071] [Table 2]

[0072]

[0073] 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.

[0074] In some embodiments, a terminal prior to RRC connection may receive configuration information for 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 for a Control Resource Set (CORESET) and a Search Space, through the MIB, 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.

[0075] 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.

[0076] The settings for the bandwidth supported by the above 5G can be used for various purposes.

[0077] 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.

[0078] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0079] 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, such as 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0080] In the method for setting the bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the initial bandwidth portion (Initial BWP) through the MIB during the initial access phase. More specifically, the terminal can receive a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive the Physical Downlink Shared Channel (PDSCH) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (Other System Information (OSI), paging, and random access).

[0081] [Bandwidth Part (BWP) Change]

[0082] 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 (201), the base station can instruct the terminal to bandwidth part #2 (202) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (202) indicated by the bandwidth part indicator in the received DCI.

[0083] As mentioned above, since DCI-based bandwidth part changes can be indicated by DCI scheduling PDSCH or PUSCH, when a UE receives a bandwidth part change request, it must be able to seamlessly receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI in the changed bandwidth part. To this end, the standard stipulates requirements for the delay time (TBWP) required when changing the bandwidth part, which can be defined, for example, as shown in [Table 3] below.

[0084] [Table 3]

[0085]

[0086] 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.

[0087] According to the requirement for the bandwidth part change delay time described above, when a terminal receives a DCI including a bandwidth part change indicator in slot n, the terminal can complete the change to a new bandwidth part indicated by the bandwidth part change indicator at a time no later than slot n+TBWP, and can perform transmission and reception for the data channel scheduled by the DCI in the changed new bandwidth part.

[0088] 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).

[0089] If the terminal receives DCI (e.g., DCI format 1_1 or 0_1) indicating a bandwidth change, the terminal may not perform any transmission or reception during the time period from the third symbol of the slot in which the PDCCH including the DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the terminal receives DCI indicating a bandwidth change in slot n and the slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0090] [CA / DC related]

[0091] FIG. 4 is a diagram 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.

[0092] Referring to FIG. 4, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (Service Data Adaptation Protocol), NR PDCP (Packet Data Convergence Protocol), NR RLC (Radio Link Control), and NR MAC (Medium Access Control) in the terminal and NR base station, respectively.

[0093] The main functions of NR SDAP may include at least some of the following functions:

[0094] - Transfer of user plane data

[0095] - Mapping function between QoS flow and data bearer for both DL and UL

[0096] - Marking function of QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0097] - Ability to map reflective QoS flow to data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0098] 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.

[0099] The main functions of NR PDCP may include at least some of the following functions:

[0100] - Header compression and decompression (ROHC only)

[0101] - User data transfer function

[0102] - In-sequence delivery of upper layer PDUs

[0103] - Out-of-sequence delivery of upper layer PDUs

[0104] - PDCP PDU reordering for reception

[0105] - Duplicate detection of lower layer SDUs

[0106] - Retransmission function (Retransmission of PDCP SDUs)

[0107] - Encryption and decryption functions (Ciphering and deciphering)

[0108] - Timer-based SDU discard in uplink.

[0109] 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.

[0110] The main functions of NR RLC may include at least some of the following functions:

[0111] - Data transfer function (Transfer of upper layer PDUs)

[0112] - In-sequence delivery of upper layer PDUs

[0113] - Out-of-sequence delivery of upper layer PDUs

[0114] - ARQ function (Error Correction through ARQ)

[0115] - Concatenation, segmentation and reassembly of RLC SDUs

[0116] - Re-segmentation of RLC data PDUs

[0117] - Reordering of RLC data PDUs

[0118] - Duplicate detection function

[0119] - Protocol error detection

[0120] - RLC SDU discard function

[0121] - RLC re-establishment function

[0122] 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.

[0123] 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.

[0124] 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.

[0125] The out-of-sequence delivery function of the NR RLC device mentioned 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.

[0126] NR MAC can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of NR MAC can include at least some of the following functions.

[0127] - Mapping function (Mapping between logical channels and transport channels)

[0128] - Multiplexing / demultiplexing of MAC SDUs

[0129] - Scheduling information reporting function

[0130] - HARQ function (Error correction through HARQ)

[0131] - Priority handling between logical channels of one UE

[0132] - Priority handling between UEs by means of dynamic scheduling

[0133] - MBMS service identification function

[0134] - Transport format selection function

[0135] - Padding function

[0136] The NR PHY layer can perform operations such as channel coding and modulating upper layer data, converting it into OFDM symbols and transmitting it over a wireless channel, or demodulating and channel decoding OFDM symbols received over a wireless channel and transmitting them to a higher layer.

[0137] The above wireless protocol structure may have various detailed structures depending on the carrier (or cell) operation method.

[0138] Referring to FIG. 4, when a base station transmits data to a terminal based on a single carrier (or cell), the base station and the terminal can use a protocol structure (400) having a single structure for each layer.

[0139] Referring to FIG. 4, when a base station transmits data to a terminal based on CA (carrier aggregation) using multiple carriers in a single TRP, the base station and the terminal can use a protocol structure (410) that multiplexes SDAP, PDCP, and RLC into multiple PHY layers through a MAC layer.

[0140] Referring to FIG. 4, 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 can use a protocol structure (420) that multiplexes SDAP and PDCP into multiple lower layers (e.g., RLC, MAC, and PHY layers).

[0141] [Unified TCI (transmission configuration indicator) state]

[0142] Hereinafter, a single TCI state indication and activation method based on the unified TCI scheme is described. The unified TCI scheme can refer to a method of integrating and managing the transmission and reception beam management methods, which were distinguished into the TCI state method used for downlink reception of the terminal in the existing Rel-15 and 16 and the spatial relation info method used for uplink transmission, into a TCI state. Therefore, when the terminal is instructed by the base station based on the unified TCI scheme, it can perform beam management using the TCI state even for uplink transmission. If the terminal has set a TCI-State, which is an upper layer signaling with the tci-stateId-r17, which is an upper layer signaling, from the base station, the terminal can perform operations based on the unified TCI scheme using the corresponding TCI-State. The TCI-State can exist in two forms: a joint TCI state or a separate TCI state.

[0143] The first type is a joint TCI state, and the terminal can be instructed by the base station to use both the TCI state to apply to uplink transmission and downlink reception through a single TCI-State. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type1 in the TCI-State based on the joint TCI state to instruct the parameters to use for downlink channel estimation, and the RS corresponding to qcl-Type2 to instruct the parameters to use as a downlink reception beam or reception filter. If the terminal is instructed to use a TCI-State based on a joint TCI state, the terminal can use the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL / UL TCI state to instruct the parameters to use as an uplink transmission beam or transmission filter. If the terminal is instructed to use a joint TCI state, the terminal can apply the same beam to both uplink transmission and downlink reception.

[0144] The second form is a separate TCI state, in which the terminal can be individually instructed by the base station to select a UL TCI state to apply to uplink transmission and a DL TCI state to apply to downlink reception. If the terminal is instructed to select a UL TCI state, the terminal can be instructed to select parameters to use as an uplink transmission beam or transmission filter using the reference RS or source RS configured in the UL TCI state. If the terminal is instructed to select a DL TCI state, the terminal can be instructed to select parameters to use for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the DL TCI state, and to select parameters to use as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2.

[0145] If the terminal is instructed with both the DL TCI state and the UL TCI state, the terminal can be instructed with parameters to be used as an uplink transmission beam or a transmission filter using the reference RS or source RS set in the corresponding UL TCI state, and can be instructed with parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 set in the corresponding DL TCI state, and can be instructed with parameters to be used as a downlink reception beam or a reception filter using the RS corresponding to qcl-Type2. 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] The terminal receives transmission / reception beam-related instructions using one of the methods selected from the joint TCI state and the separate TCI state through upper layer signaling. At this time, there may be two transmission / reception beam instruction methods from the base station: a MAC-CE-based instruction method and a MAC-CE-based activation and DCI-based instruction method.

[0151] 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.

[0152] If the MAC-CE includes one joint TCI state, the UE can determine the uplink transmission beam or transmission filter and the downlink reception beam or reception filter using the indicated joint TCI state starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful. If the MAC-CE includes two or more joint TCI states, the UE can confirm that the multiple joint TCI states indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE is successful, and activate the indicated joint TCI state.

[0153] Afterwards, the terminal may receive DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. 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).

[0154] 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.

[0155] If there is one separate TCI state set included in the MAC-CE, the UE can determine the uplink transmission beam or transmission filter and the downlink reception beam or reception filter using the separate TCI states included in the indicated separate TCI state set starting 3 ms after the PUCCH transmission including HARQ-ACK information indicating whether reception for the corresponding PDSCH was successful. At this time, the separate TCI state set may mean single or multiple separate TCI states that one code point of the TCI state field in DCI format 1_1 or 1_2 can have, and one separate TCI state set may include one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state. If there are two or more separate TCI state sets included in the MAC-CE, the 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 for the corresponding PDSCH was successful, and activate the indicated separate TCI state sets.

[0156] Each code point in 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 corresponding DCI to the uplink transmit and downlink receive beams. DCI format 1_1 or 1_2 may or may not include downlink data channel scheduling information (with DL assignment).

[0157] FIG. 5 is a diagram illustrating a beam application time 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 set of separate TCI states indicated by the TCI state field in the corresponding DCI to uplink transmission and downlink reception beams.

[0158] In Fig. 5, DCI format 1_1 or 1_2 with DL assignment (500) is described. If a terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from a base station (501) and indicates one joint TCI state or a separate TCI state set based on an integrated TCI scheme, the terminal receives a PDSCH scheduled based on the received DCI (505), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH was successful (510). At this time, the HARQ-ACK can include the meaning of whether reception of both the DCI and the PDSCH was successful, and if at least one of the DCI and the PDSCH was not received, the terminal can transmit a NACK, and if reception of both was successful, the terminal can transmit an ACK.

[0159] In Fig. 5, DCI format 1_1 or 1_2 without DL assignment (550) is described. 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.

[0160] Includes scrambled CRC using CS-RNTI.

[0161] All bits assigned to all fields used as RV (Redundancy Version) fields have a value of 1.

[0162] All bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields have a value of 1.

[0163] All bits assigned to all fields used as NDI (New Data Indication) fields have values ​​of 0.

[0164] For FDRA (Frequency Domain Resource Allocation) Type 0, all bits assigned to the FDRA field have values ​​of 0, for FDRA Type 1, all bits assigned to the FDRA field have values ​​of 1, and when the FDRA method is dynamicSwitch, all bits assigned to the FDRA field have values ​​of 0.

[0165] The terminal can transmit a PUCCH including a HARQ-ACK indicating whether reception was successful for the DCI format 1_1 or 1_2 assuming the above-described matters (560).

[0166] 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 set of separate TCI states 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).

[0167] 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 applies.

[0168] A terminal can apply one joint TCI state indicated via MAC-CE or DCI to reception of control resource sets connected to all terminal-specific search spaces, reception of PDSCHs scheduled as PDCCHs transmitted from the control resource sets, transmission of PUSCHs, and transmission of all PUCCH resources.

[0169] 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.

[0170] A terminal can apply a separate TCI state set indicated via MAC-CE or DCI to all PUSCH and PUCCH resources if it includes one UL TCI state, and can apply it to reception of control resource sets connected to all terminal-specific search spaces based on previously indicated DL TCI states, and to reception of PDSCH scheduled as PDCCH transmitted from the corresponding control resource set.

[0171] When a separate set of TCI states indicated via MAC-CE or DCI includes one DL TCI state and one UL TCI state, the terminal may apply the DL TCI state to reception for all control resource sets associated with the terminal-specific search space and to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and may apply the UL TCI state to all PUSCH and PUCCH resources.

[0172] [Unified TCI state MAC-CE]

[0173] Hereinafter, a single TCI state indication and activation method based on the integrated TCI scheme is described. The terminal receives a PDSCH including the following MAC-CE from the base station, and from 3 slots after transmitting a HARQ-ACK for the corresponding PDSCH to the base station, the terminal can interpret each code point of the TCI state field in DCI format 1_1 or 1_2 based on the information in the MAC-CE received from the base station. That is, the terminal can activate each entry of the MAC-CE received from the base station to each code point of the TCI state field in DCI format 1_1 or 1_2.

[0174] 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.

[0175] Serving Cell ID (600): This field can indicate which serving cell the MAC-CE is applied to. This field can be 5 bits long. If the serving cell indicated by this field is included in one or more of the upper layer signaling lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0176] DL BWP ID (605): This field can indicate which DL BWP the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. This field can be 2 bits long.

[0177] UL BWP ID (610): This field can indicate which UL BWP the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. This field can be 2 bits long.

[0178] 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.

[0179] 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.

[0180] 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 a 7-bit TCI-StateId. If the D / U field is set to 0, the MSB (most significant bit) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the upper layer signaling UL-TCIState-Id. The maximum number of TCI states that can be activated is 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0181] R: This indicates a reserved bit and can be set to 0.

[0182] For the MAC-CE structure of the above-described Figure 6, regardless of whether unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint or separate,

[0183] The third octet including the P1, P2, … P8 fields in Fig. 6 may be included in the MAC-CE structure. In this case, the terminal can perform TCI state activation using a fixed MAC-CE structure regardless of the upper layer signaling configured by the base station.

[0184] 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 configured by the base station.

[0185] Additionally, all D / U fields located from the fourth octet to the first bit in Fig. 6 can be regarded as R fields, and all corresponding R fields can be set to 0 bits.

[0186] [PDCCH: DCI related]

[0187] Next, we will specifically explain downlink control information (DCI) in 5G systems.

[0188] 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.

[0189] 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.

[0190] 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).

[0191] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 4] below.

[0192] [Table 4]

[0193]

[0194] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include, for example, the information in [Table 5] below.

[0195] [Table 5]

[0196]

[0197]

[0198] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 6] below.

[0199] [Table 6]

[0200]

[0201] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 7] below.

[0202] [Table 7]

[0203]

[0204]

[0205] [PDCCH: CORESET, REG, CCE, Search Space]

[0206] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0207] 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) can be set to specific frequency resources (703) within the entire UE bandwidth part (710) on the frequency axis. The time axis can be set to one or more OFDM symbols, which can 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.

[0208] In the aforementioned 5G, the control region can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, the frequency location of the control region, and the symbol length of the control region. For example, this information may include the information in [Table 8] below.

[0209] [Table 8]

[0210]

[0211]

[0212] 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.

[0213] Figure 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.

[0214] Referring to FIG. 8, the basic unit of time and frequency resources constituting the control channel can be referred to as a REG (Resource Element Group) (803), and the REG (803) can be defined as 1 OFDM symbol (801) on the time axis and 1 PRB (Physical Resource Block) (802) on the frequency axis, i.e., 12 subcarriers. The base station can concatenate REGs (803) to form a downlink control channel allocation unit.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] [Table 9]

[0221]

[0222]

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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

[0227] DCI format 2_0 with CRC scrambled by SFI-RNTI

[0228] DCI format 2_1 with CRC scrambled by INT-RNTI

[0229] DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0230] DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0231] 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.

[0232] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0233] DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0234] The RNTIs specified may follow the definitions and uses below.

[0235] C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0236] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0237] CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0238] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0239] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0240] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0241] INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0242] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0243] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0244] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0245] The aforementioned specified DCI formats may follow the definitions in [Table 10] below.

[0246] [Table 10]

[0247]

[0248] 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.

[0249] [Mathematical Formula 1]

[0250]

[0251]

[0252] 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.

[0253] [PUCCH: Transmission Related]

[0254] In the NR system, a terminal can transmit control information (UCI) to a base station via the PUCCH. The control information may include at least one of the following: HARQ-ACK, which indicates whether demodulation / decoding of a TB (transport block) received by the terminal via the PDSCH was successful; SR (scheduling request), which requests resource allocation from the PUSCH base station for uplink data transmission; and channel state information (CSI), which is information for reporting the channel status of the terminal.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] W i (m) is the length of the spreading code (NSF) given It is determined as follows, and is given as in [Table 11], for example. 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] , 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 W i (m) is This is w i (m)=

[0011] .

[0262] [Table 11]

[0263]

[0264] 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.

[0265] [Table 12]

[0266]

[0267] For example, if the number of transmission symbols of PUCCH format 3 is 8, DMRS is transmitted in the 1st and 5th symbols, starting with the first start symbol of the 8 symbols as 0. [Table 12] is applied in the same way to the DMRS symbol positions of PUCCH format 4.

[0268] Next, PUCCH format 4 is a long PUCCH format based on DFT-S-OFDM that can support control information exceeding 2 bits, and uses frequency resources equivalent to 1 RB. The control information can be composed of HARQ-ACK, SR, and CSI, or a combination thereof. What differentiates PUCCH format 4 from PUCCH format 3 is that PUCCH format 4 can multiplex PUCCH format 4 of multiple terminals within one RB. Multiplexing of PUCCH format 4 of multiple terminals is possible by applying Pre-DFT OCC (Orthogonal Cover Code) to the control information before the IFFT. However, the number of control information symbols that can be transmitted by one terminal decreases depending on the number of multiplexed terminals. The number of multiplexable terminals, i.e., the number of different available OCCs, can be 2 or 4, and the number of OCCs and the applicable OCC index can be set through a higher layer.

[0269] 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.

[0270] Short PUCCH can support transmission formats such as PUCCH format 0 and PUCCH format 2 depending on the number of control information bits that can be supported. First, PUCCH format 0 is a short PUCCH format that can support up to 2 bits of control information and uses frequency resources of 1 RB. Control information can be composed of HARQ-ACK and SR, or a combination thereof. PUCCH format 0 does not transmit DMRS, and is structured to transmit only sequences mapped to 12 subcarriers in the frequency axis within one OFDM symbol. The terminal generates a sequence based on the group hopping or sequence hopping configuration and the configured ID set by the upper signal from the base station, and adds another CS value depending on whether it is ACK or NACK to the indicated initial CS (cyclic shift) value, and cyclically shifts the generated sequence with the final CS value, and maps it to 12 subcarriers for transmission.

[0271] 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.

[0272] [Table 13]

[0273]

[0274] 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.

[0275] [Table 14]

[0276]

[0277] Next, PUCCH format 2 is a short PUCCH format that supports control information exceeding 2 bits, and the number of RBs used can be set through a higher layer. The control information can be composed of a combination of HARQ-ACK, SR, and CSI, or each of them. When the index of the first subcarrier is #0, the location of the subcarrier where the DMRS is transmitted within one OFDM symbol in PUCCH format 2 can be fixed to the subcarriers with indices of #1, #4, #7, and #10. The control information can be mapped to the remaining subcarriers except for the subcarrier where the DMRS is located through a modulation process after channel coding.

[0278] 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.

[0279] [Table 15]

[0280]

[0281] 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.

[0282] For PUCCH repeated transmission, PUCCH transmission in each slot is performed using the same starting symbol, and the corresponding starting symbol can be configured 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 configured 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.

[0283] 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.

[0284] 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.

[0285] 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.

[0286] [PUCCH: Transmission Power Related]

[0287] 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 transmitting by setting the transmission power of an uplink control channel by a terminal is described. The uplink control channel transmission power (P) of the terminal is set together with a PUCCH power control adjustment state corresponding to an i-th transmission unit and a closed loop index (closed loop index)l. PUCCH ) can be determined as shown in [Mathematical Formula 2] below, which is expressed in dBm units. In [Mathematical Formula 2] below, when a terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined for each primary cell c, carrier frequency f, and bandwidth part b, and can be distinguished by indices b, f, and c.

[0288] [Equation 2]

[0289]

[0290] - : 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.

[0291] -

[0292] - is set via p0-nominal, a Cell Specific upper layer signaling with a cell specific value, and if there is no such setting, can be 0 dBm. is set through p0-PUCCH-Value in upper layer signaling p0-PUCCH in primary cell c, bandwidth part b, carrier frequency f, terminal specific value, and q u is greater than or equal to 0 and Qu It can be a smaller value than Q u Is It can mean the size of the set of values ​​and can be set via the upper layer signaling maxNrofPUCCH-P0-PerSet. A set of values ​​can be set via the upper layer signaling p0-Set, or if there is no such set can be considered as

[0293] - : Subcarrier spacing configuration value

[0294] - : 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).

[0295] - : Pathloss is 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.

[0296] - : For PUCCH format 0, if deltaF-PUCCH-f0, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 1, if deltaF-PUCCH-f1, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 2, if deltaF-PUCCH-f2, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 3, if deltaF-PUCCH-f3, which is an upper layer signaling, is set, the corresponding value is used. For PUCCH format 4, if deltaF-PUCCH-f4, which is an upper layer signaling, is set, the corresponding value is used. For all PUCCH formats, if no upper layer signaling is set, 0 can be used.

[0297] - : 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.

[0298] - : It may mean a PUCCH power control adjustment state value for the i-th PUCCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and primary cell c. Here, the closed loop power adjustment for PUCCH transmission may use an accumulation method that accumulates and applies a value indicated by a TPC command.

[0299] 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.

[0300] - : It may be a value indicated by a TPC command field included in DCI format 1_0, 1_1 or 1_2 that schedules the i-th PUCCH transmission unit corresponding to the closed loop index l and PDSCH reception within bandwidth part b, carrier frequency f, and primary cell c, or a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUCCH-RNTI.

[0301] 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.

[0302] 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.

[0303] 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 if the terminal has been configured with PUCCH-SpatialRelationInfo, which is an upper layer signaling, the terminal can obtain a connection relationship between the pucch-SpatialRelationInfoId value and the closedLoopIndex value that sets a closed loop index 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 a closed loop index value based on the corresponding p0-PUCCH-Id index.

[0304] 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.

[0305] - PUCCH power control adjustment state g 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. b,f,c (i,l) can be calculated as in [Mathematical Formula 3].

[0306] [Equation 3]

[0307]

[0308] o As described above, the value indicated by the TPC command field included in the DCI format 1_0, 1_1 or 1_2 that schedules the m-th PUCCH transmission unit and PDSCH reception corresponding to the closed loop index l within the bandwidth part b, carrier frequency f and primary cell c, or the value indicated by the TPC command field included in the DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUCCH-RNTI. If the TPC command accumulation operation is possible, The value can have a corresponding value in [dB] units depending on which value the TPC command field included in DCI format 1_0, 1_1, 1_2 or 2_2 is indicated to, as shown in [Table 18]. For example, if the value of the TPC command field is 0, can have a value of -1 dB.

[0309] o is a specific set C of TPC command values ​​described above. i For all transmission units corresponding to mine can mean the sum of . In this case, 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 .

[0310] - 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.

[0311] - C i The starting point for determining is from the starting symbol of the i - i0th PUCCH transmission unit. It can be a point as far back as the symbol. 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.

[0312] - 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.

[0313] [PUSCH: Transmission Method Related]

[0314] 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.

[0315] 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.

[0316] 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.

[0317] [Table 16]

[0318]

[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]

[0327]

[0328] 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).

[0329] SRI can be provided through the SRS resource indicator field in DCI or configured through the srs-ResourceIndicator higher-level signaling. When transmitting a codebook-based PUSCH, the UE is configured with at least one SRS resource, and can be configured with up to two. When the UE receives an SRI through DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted prior to the PDCCH containing the SRI.

[0330] Additionally, the TPMI and transmission rank can be provided through the precoding information and number of layers fields in the DCI, or can be configured through the higher-level signaling precodingAndNumberOfLayers. The TPMI is used to indicate the precoder 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.

[0331] 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'.

[0332] 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'.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be configured with one connected NZP CSI-RS resource (non-zero power CSI-RS). The UE can perform calculations for a precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the aperiodic SRS transmission at the UE is less than 42 symbols, the UE does not expect information about the precoder for SRS transmission to be updated.

[0337] 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.

[0338] 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.

[0339] 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 set through the srs-ResourceIndicator, which is a higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the UE to the base station. 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.

[0340] 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.

[0341] [PUSCH: Transmission Power Related]

[0342] In one embodiment of the present disclosure, when uplink data is transmitted through an uplink data channel (PUSCH: Physical Uplink Shared Channel) in response to a power control command received from a base station, a method for transmitting by setting the transmission power of the uplink data channel by a terminal is described. The uplink data channel transmission power of the terminal, together with the i-th transmission unit, the parameter set configuration index j, and the PUSCH power control adjustment state corresponding to the closed loop index l, can be determined as shown in [Mathematical Formula 4] below, which is expressed in units of dBm. In [Mathematical Formula 4] below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be set for each cell c, each carrier frequency f, and each bandwidth part b, and can be distinguished by indices b, f, and c.

[0343] [Equation 4]

[0344]

[0345] - : 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.

[0346] - is set to cell-specific upper layer signaling to the terminal, is a value set by terminal-specific upper layer signaling. Here, when j=0, it means PUSCH for transmitting msg3, when j=1, it means configured grant PUSCH, and if j={2, ...,J-1} is one of the values, it means grant PUSCH.

[0347] - : Subcarrier spacing configuration value

[0348] - : 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).

[0349] - : It 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.

[0350] - : 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. d The UE can decide this via upper layer configuration and SRI (in case of dynamic grant PUSCH or configured grant PUSCH based on ConfiguredGrantConfig that does not include upper layer configuration rrc-ConfiguredUplinkGrant (type 2 configured grant PUSCH)) or via upper layer configuration.

[0351] - : It refers to a value determined according to the MCS (Modulation Coding Scheme) and the format of information transmitted via PUSCH (TF: transport format, e.g., whether UL-SCH is included or CSI is included, etc.).

[0352] - : Refers to a value for a closed loop index that can be determined by a higher 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 higher layer parameter tpc-Accumulation is set. If the higher 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.

[0353] 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.

[0354] - : A value indicated by a TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c, or a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI.

[0355] 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.

[0356] 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.

[0357] ● 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.

[0358] ● If the terminal has been configured with the upper layer signaling SRI-PUSCH-PowerControl, 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 the upper layer signaling sri-PUSCH-ClosedLoopIndex, 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.

[0359] ● 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 set, the terminal may regard the closed loop index as 0.

[0360] ● 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.

[0361] - 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].

[0362] [Equation 5]

[0363]

[0364] o As described above, the TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the m-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c may be a value indicated by the TPC command field included in DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUSCH-RNTI. If the TPC command accumulation operation is possible, The value may have a corresponding value in [dB] units depending on which value the TPC command field included in the DCI format 0_0, 0_1, 0_2, or 2_2 is indicated as in [Table 18] below. For example, if the value of the TPC command field is 0, can have a value of -1 dB.

[0365] o is a specific set of TPC command values ​​described above D i For all transmission units corresponding to mine can mean the sum of . In this case, C(D i ) is a set D i It can mean the number of all elements belonging to D 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. 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 .

[0366] ● D i The end point for determining is from the start symbol of the i-th PUSCH transmission unit. It could be as far back as the symbol.

[0367] ● D i The starting point for determining is from the starting symbol of the i-i0th PUSCH transmission unit. It can be a point as far back as the symbol. i0, a positive integer, is the D i The end point (K from the start symbol of the i-th PUSCH transmission unit) to determine 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.

[0368] ● 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.

[0369] - 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, then 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].

[0370] [Equation 6]

[0371]

[0372] o As described above, the TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c may be a value indicated by the TPC command field included in DCI format 2_2 transmitted together with the CRC scrambled with TPC-PUSCH-RNTI. If the TPC command accumulation operation is impossible, The value may have a corresponding value in [dB] units depending on which value the TPC command field included in the DCI format 0_0, 0_1, 0_2, or 2_2 is indicated as in [Table 18] below. For example, if the value of the TPC command field is 0, can have a value of -4 dB.

[0373] [Table 18]

[0374]

[0375] [SRS related]

[0376] 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.

[0377] - srs-ResourceSetId: SRS resource set index

[0378] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0379] - 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.

[0380] - 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'.

[0381] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] 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.

[0392] [Table 19]

[0393]

[0394]

[0395] 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.

[0396] [Table 20]

[0397]

[0398] 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.

[0399] 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.

[0400] [SRS Transmission Power Related]

[0401] 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.

[0402] [Equation 7]

[0403]

[0404] - : 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.

[0405] - : Bandwidth part b, carrier frequency f, can be set to p0, which is the upper layer signaling for cell c, and SRS resource set q s can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0406] - : Subcarrier spacing configuration value

[0407] - : It can 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).

[0408] - : The bandwidth part b, carrier frequency f, and cell c can be set to alpha, which is the upper layer signaling, and SRS resource set q. s can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0409] - : Pathloss is 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.

[0410] - : It may mean the 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.

[0411] The SRS power control adjustment state can be determined through the bandwidth part b, carrier frequency f, cell c, and i-th transmission unit.

[0412] - 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,cWe can compute (i,l) and its value is h b,f,c It can be used by substituting (i,l).

[0413] [Equation 8]

[0414] h b,f,c (i,l) = f b,f,c (i,l)

[0415] - 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.

[0416] [Equation 9]

[0417]

[0418] - : 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.

[0419] o is a specific set of TPC command values ​​described above. i For all transmission units corresponding to mine can mean the sum of . At this time, C(s i ) is a set s i It can mean the number of all elements within s. i s may mean a set of DCIs including all TPC command values ​​for which TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. iTo 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 .

[0420] ● 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.

[0421] ● 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 The 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 is an earlier time point in time by (i - i0) symbols.

[0422] ● 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.

[0423] - 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.

[0424] [Equation 10]

[0425]

[0426] o As described above, it may be a value indicated by the TPC command field included in the DCI format 2_3 within the bandwidth part b, carrier frequency f, and cell c, and the value may follow the above [Table 18]. For example, if the value of the TPC command field is 0, can have a value of -4 dB.

[0427] [Regarding terminal capability reporting]

[0428] 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.

[0429] 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.

[0430] 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 by which the terminal configures the UE capability in the NR system is as follows.

[0431] 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.

[0432] 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.

[0433] 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."

[0434] 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.

[0435] 5. Also, if the requested rat Type is eutra-nr and has influence, 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.

[0436] 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.

[0437] [NC-JT related]

[0438] 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.

[0439] 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.

[0440] Joint Transmission (JT) is a representative transmission technology for the aforementioned cooperative communication, which increases the signal strength or processing rate received by a terminal by transmitting a signal to a single terminal through a number of different cells, TRPs, or / and beams. At this time, the channel between each cell, TRP, or / and beam and the terminal may have significantly different characteristics, and in particular, in the case of Non-Coherent Joint Transmission (NC-JT) that supports non-coherent precoding between each cell, TRP, or / and beam, individual precoding, MCS, resource allocation, TCI indication, etc. may be required depending on the channel characteristics of each link between each cell, TRP, or / and beam and the terminal.

[0441] The above-described NC-JT transmission can be applied to at least one channel among the downlink data channel (PDSCH), downlink control channel (PDCCH), uplink data channel (PUSCH), and uplink control channel (PUCCH). When transmitting PDSCH, transmission information such as precoding, MCS, resource allocation, and TCI are indicated as DL DCI, and for NC-JT transmission, the transmission information must be independently indicated for each cell, TRP, or / and beam. This is a major factor that increases the payload required for DL ​​DCI transmission, and this may adversely affect the reception performance of the PDCCH transmitting the DCI. Therefore, in order to support JT of PDSCH, it is necessary to carefully design a tradeoff between the amount of DCI information and the reception performance of control information.

[0442] FIG. 10 is a diagram illustrating an example of antenna port configuration and resource allocation for transmitting a PDSCH 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.

[0443] Referring to FIG. 10, a coherent joint transmission (C-JT) (1000) supporting coherent precoding between each cell, TRP or / and beam is illustrated.

[0444] 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.

[0445] Referring to FIG. 10, 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.

[0446] 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.

[0447] Referring to FIG. 10, various wireless resource allocations can be considered, such as when the frequency and time resources used by multiple TRPs for PDSCH transmission are all the same (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).

[0448] To support NC-JT, DCIs of various forms, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to a single terminal.

[0449] FIG. 11 is a diagram illustrating an example of a configuration of downlink control information (DCI) for NC-JT in which each TRP transmits a different PDSCH or a different PDSCH layer to a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0450] Referring to FIG. 11, case #1 (1000) 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.

[0451] Referring to FIG. 11, case #2 (1005) 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.

[0452] 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.

[0453] 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.

[0454] Referring to FIG. 11, 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.

[0455] 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.

[0456] 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).

[0457] Referring to FIG. 11, case #4 (1115) is an example in which, in a situation in which (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to the serving TRP (TRP#0) used for single PDSCH transmission, control information for the PDSCHs transmitted from the (N-1) additional TRPs is transmitted in the same DCI (Long DCI) as the control information for the PDSCHs transmitted from the serving TRP. That is, the terminal can obtain control information for the 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.

[0458] 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.

[0459] 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.

[0460] 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.

[0461] 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.

[0462] The wireless protocol architecture for NC-JT in this disclosure can be used in various ways depending on the TRP deployment scenario. For example, when there is no or small backhaul delay between cooperating TRPs.

[0463] Similar to 410 in Fig. 4, a method (CA-like method) using a structure based on MAC layer multiplexing 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) that secures delay-robust characteristics by using an independent structure for each TRP starting from the RLC layer is possible, similar to 420 in Fig. 4.

[0464] 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.

[0465] [Multi-DCI based Multi-TRP]

[0466] 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.

[0467] 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.

[0468] * 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.

[0469] ** 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.

[0470] ** 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.

[0471] * 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.

[0472] * 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.

[0473] * 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.

[0474] 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.

[0475] 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.

[0476] The PDSCH TCI state activation / deactivation MAC-CE applicable to the multi-DCI based multi-TRP transmission method can follow Fig. 9.

[0477] Referring to Fig. 9, 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.

[0478] Referring to FIG. 9, 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.

[0479] 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.

[0480] 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.

[0481] 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.

[0482] 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.

[0483] 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.

[0484] [Single-DCI based Multi-TRP]

[0485] 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.

[0486] 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.

[0487] As another example, if at least one codepoint among all codepoints in the TCI state field within the DCI indicates two TCI states, the UE may assume that the base station can transmit based on the single-DCI based multi-TRP method. In this case, at least one codepoint indicating two TCI states within the TCI state field may be activated via the Enhanced PDSCH TCI state activation / deactivation MAC-CE.

[0488] Figure 12 is a diagram illustrating the structure of the Enhanced PDSCH TCI state activation / deactivation MAC-CE. Referring to Figure 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.

[0489] [Table 21]

[0490]

[0491] In Fig. 12, if the value of the C0 field (1205) is 1, the MAC-CE may include a TCI state ID0,2 field (1215) in addition to the TCI state ID0,1 field (1210). This means that TCI state ID0,1 and TCI state ID0,2 are activated for the 0th codepoint of the TCI state field included in the DCI, and if the base station indicates the codepoint to the terminal, the terminal may be indicated with two TCI states. If the value of the C0 field (1205) is 0, the MAC-CE cannot include the TCI state ID0,2 field (1215), and this means that one TCI state corresponding to TCI state ID0,1 is activated for the 0th codepoint of the TCI state field included in the DCI.

[0492] 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.

[0493] [Distinguishing between Single-DCI-based Multi-TRP PDSCH Repetitive Transmission Techniques (TDM / FDM / SDM)]

[0494] 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.

[0495] [Table 22]

[0496]

[0497] In the above [Table 22], each column can be explained as follows.

[0498] - 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.

[0499] - 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.

[0500] - 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.

[0501] * 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.

[0502] * 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.

[0503] * Condition 3: If all TDRA entries that can be indicated by the Time Domain Resource Allocation field do not contain a setting for repetitionNumber.

[0504] - 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'.

[0505] - 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.

[0506] * 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.

[0507] * Single-TRP TDM scheme B: This refers to PDSCH repeated transmission based on time resource division between single TRP slots. According to Condition 1 related to repetitionNumber described above, the UE repeatedly transmits PDSCH in the time dimension for the number of slots with repetitionNumber that is greater than 1 set in the TDRA entry indicated by the Time Domain Resource Allocation field. At this time, for each slot with repetitionNumber, 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.

[0508] * Multi-TRP SDM: This refers to a PDSCH transmission method based on spatial resource division based on multiple TRPs. This is a method of receiving by dividing layers from each TRP. Although it is not a repetitive transmission method, it can increase the reliability of PDSCH transmission by increasing the number of layers and lowering the coding rate. The terminal can receive PDSCH by applying the two TCI states indicated through the TCI state field in the DCI for each of the two CDM groups indicated by the base station.

[0509] * Multi-TRP FDM scheme A: This refers to a multi-TRP based frequency resource division PDSCH transmission method. It has one PDSCH transmission position (occasion), so it is not repetitive transmission like multi-TRP SDM, but it is a technique that can transmit with high reliability by increasing the frequency resource amount and lowering the coding rate. Multi-TRP FDM scheme A can apply two TCI states indicated through the TCI state field in the DCI for non-overlapping frequency resources. If the PRB bundling size is determined as wideband, if the number of RBs indicated by the Frequency Domain Resource Allocation field is N, the terminal applies the first TCI state to the first ceil(N / 2) RBs and applies the second TCI state to the remaining floor(N / 2) RBs. Here, ceil(.) and floor(.) are operators that indicate rounding up and down to the first decimal place. If the PRB bundling size is determined as 2 or 4, even-numbered PRGs receive the first TCI state, and odd-numbered PRGs receive the second TCI state.

[0510] * 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.

[0511] * 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.

[0512] * 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 the number of slots indicated by the repetitionNumber through the Time Domain Resource Allocation field in the DCI.

[0513] 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.

[0514] 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).

[0515] 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.

[0516] 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.

[0517] In the following disclosure, 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.

[0518] 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.

[0519] 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.

[0520] 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.

[0521] MIB (Master Information Block)

[0522] SIB (System Information Block) or SIB

[0523] RRC (Radio Resource Control)

[0524] MAC (Medium Access Control) CE (Control Element)

[0525] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the physical layer channel or signaling below.

[0526] PDCCH (Physical Downlink Control Channel)

[0527] DCI (Downlink Control Information)

[0528] UE-specific DCI

[0529] Group common DCI

[0530] Common DCI

[0531] Scheduling DCI (e.g., DCI used for scheduling downlink or uplink data)

[0532] Non-scheduled DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0533] PUCCH (Physical Uplink Control Channel)

[0534] UCI (Uplink Control Information)

[0535] 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.

[0536] 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.

[0537] In the following disclosure, 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.

[0538] <Embodiment 1: Method for setting transmission power parameters when supporting integrated TCI state>

[0539] 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.

[0540] 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.

[0541] [Table 23] ServingCellConfig

[0542]

[0543] As in the above [Table 23], the UE 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. (unifiedTCI-StateType: Indicates the unified TCI state type the UE is configured for this serving cell. The value separate means this serving cell is configured with dl-OrJointTCI-StateList for DL ​​TCI state and ul-TCI-ToAddModList for UL TCI state. The value joint means this serving cell is configured with dl-OrJointTCI-StateList for joint TCI state for UL and DL operation. The network does not configure the field in a serving cell that is configured with more than one value for the coresetPoolIndex.)

[0544] If the terminal receives the upper layer signaling unifiedTCI-StateType-r17 as separate, this means that when the terminal receives configuration and indication 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 lists for the DL TCI state and UL TCI state, respectively, from the base station.

[0545] If the terminal receives the upper layer signaling unifiedTCI-StateType-r17 as joint, it may mean that the terminal can comprehensively set and receive instructions on the TCI state applicable to downlink reception and uplink transmission (e.g., joint TCI state) when receiving the 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.

[0546] As in [Table 23] above, the terminal can receive the configuration of uplink-PowerControlToAddModList, which is an upper layer signaling, in MIMOParam-r17. (uplink-PowerControlToAddModList: Configures UL power control parameters for PUSCH, PUCCH and SRS when field unifiedTCI-StateType is configured for this serving cell.) The upper layer signaling uplink-PowerControlToAddModList can include transmission power parameters for PUSCH, PUCCH and SRS when the terminal receives the configuration of unifiedTCI-StateType, which is an upper layer signaling, in the corresponding serving cell. The upper layer signaling uplink-PowerControlToAddModList can include a list of up to 64 Uplink-powerControl-r17 and Uplink-powerControlId-r17 parameters. The upper layer signaling Uplink-powerControl-r17 can have a structure as shown in [Table 24] below.

[0547] As in the above [Table 23], the UE can set pathlossReferenceLinking in ServingCellConfig. (pathlossReferenceLinking: Indicates whether the UE shall apply as pathloss reference either the downlink of SpCell (PCell for MCG or PSCell for SCG) or of SCell that corresponds with this uplink (see TS 38.213

[0013] , clause 7).

[0548] ) The upper layer signaling pathlossReferenceLinking may indicate whether the terminal refers to a list of reference signals for path loss measurement in SpCell or SCell.

[0549] [Table 24] Uplink-powerControl

[0550]

[0551] 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.

[0552] 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).

[0553] [Table 25] BWP-UplinkDedicated

[0554]

[0555] As in the above [Table 25], the terminal can be configured with ul-TCI-StateList-r17, which is an upper layer signaling (ul-TCI-StateList: Indicates the applicable UL TCI states for PUCCH, PUSCH and SRS.), and the terminal can be configured with either explicitlist or unifiedTCI-StateRef-r17. If the terminal has configured explicitlist for ul-TCI-StateList-r17, which is an upper layer signaling, the terminal can explicitly configure a list of UL TCI states that can be used in the uplink bandwidth portion through ul-TCI-ToAddModList-r17 (ul-TCI-ToAddModList: Indicates a list of UL TCI states.). If the terminal has set unifiedTCI-StateRef-r17 for the upper layer signaling ul-TCI-StateList-r17 (unifiedTCI-StateRef: Provides the serving cell and UL BWP where UL TCI states applicable to this UL BWP are defined. The value of unifiedTCI-StateType of current serving cell is the same in the serving cell indicated by unifiedTCI-StateRef.), 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 set in another uplink bandwidth part without explicitly setting the joint TCI state or UL TCI state in the uplink bandwidth part. The upper layer signaling unifiedTCI-StateRef-r17 can mean the index of any bandwidth part in any serving cell.Additionally, the terminal can expect that the serving cell that includes the bandwidth portion for which unifiedTCI-StateRef-r17 has been set and any serving cell that includes the bandwidth portion that can be set from the base station through unifiedTCI-StateRef-r17 have the same unifiedTCI-StateType.

[0556] 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 UE may receive ul-powerControl, which is an upper layer signaling, for all uplink bandwidth portions within a specific serving cell (ul-powerControl: Configures power control parameters for PUCCH, PUSCH and SRS when UE is configured with unifiedTCI-StateType for this serving cell. For each serving cell, ul-powerControl is either configured in all BWP-UplinkDedicated or it is not configured in any BWP-UplinkDedicated. When unifiedTCI-StateRef in the BWP-UplinkDedicated or in the PDSCH-Config if the unifiedTCI-StateType is set to joint, of a serving cell refers to another serving cell, ul-powerControl is either configured in all BWP-UplinkDedicated of these two serving cells or it is not configured in any BWP-UplinkDedicated of these two serving cells.), or may not receive 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 portion 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 portions within the serving cell, or not have ul-powerControl set in the referenced serving cell and all uplink bandwidth portions within the serving cell. The upper layer signaling, ul-powerControl, can be set to the terminal only when the condition called NoTCI-PC is met, and the meaning of the condition called NoTCI-PC can mean a case where the upper layer signaling, ul-powerControl, is not set within the joint TCI state or UL TCI state of the serving cell (NoTCI-PC: The field is optionally present, Need R, if unifiedTCI-StateType is configured for this serving cell and ul-powerControl is not configured for any UL TCI state or joint TCI state of this serving cell. Otherwise it is absent, Need R).

[0557] As in the above [Table 25], if the UE is configured with unifiedTCI-StateType, the UE may be configured with upper layer signaling pathlossReferenceRSToAddModList-r17 (pathlossReferenceRSToAddModList: A list of Reference Signals (e.g., a CSI-RS config or a SS block) to be used for path loss estimation for PUSCH, PUCCH and SRS for unified TCI state operation. If unifiedTCI-StateType is not configured for the serving cell, no element in this list is configured.), and the upper layer signaling may mean a list of reference signals that can be used to calculate path loss when transmitting PUSCH, PUCCH, or SRS if the UE supports unified TCI state. If the UE is not configured with unifiedTCI-StateType, the UE may not include any list in the upper layer signaling.

[0558] If the terminal has been set to 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 indicated TCI state is applied (Regarding cross-CC PL-RS indication in unified TCI framework, PL RS is provided by pathlossReferenceRS-Id-r17 in the indicated joint / UL-TCI state on a serving cell to which the indicated TCI state is applied, or, if provided, on a serving cell indicated by a value of pathlossReferenceLinking). If the terminal has been set to the pathlossReferenceLinking, the terminal may regard the reference signal for the indicated path loss measurement as referring to a reference signal for path loss measurement set within a serving cell set via the pathlossReferenceLinking.

[0559] If the terminal operates based on the integrated TCI state, that is, if the terminal receives the upper layer signaling unifiedTCI-StateType set 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 receives the upper layer signaling unifiedTCI-StateType set to joint, the terminal can set and receive instructed to the joint TCI state from the base station using the upper layer signaling structure shown in [Table 26] below. If the terminal receives the upper layer signaling unifiedTCI-StateType set to separate, the terminal can set and receive instructed to 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 to the UL TCI state from the base station using the upper layer signaling structure shown in [Table 27].

[0560] 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.

[0561] 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.

[0562] [Table 26] TCI-State

[0563]

[0564] [Table 27] TCI-UL-State

[0565]

[0566] The terminal can be configured with upper layer signaling related to transmission power parameters applicable to SRS transmission according to [Table 28] and [Table 29].

[0567] [Table 28] SRS-Config

[0568]

[0569] [Table 29] SRS-ResourceSet

[0570]

[0571]

[0572] The description of each upper layer signaling parameter in [Table 28] and [Table 29] above may be as follows.

[0573] tpc-Accumulation: If the terminal is not configured for tpc-Accumulation, the terminal may perform an operation of additionally accumulating values ​​of previously indicated TPC commands 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.

[0574] Alpha: The terminal can be configured with an alpha value to determine the SRS transmission power through the corresponding upper layer signaling.

[0575] 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 p0 value in the above [Mathematical Formula 7]. The value 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_UE_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, ) can be determined as a sum. At this time, the Uplink-powerControlId-r17 can be determined through the following method.

[0576] 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 portion.

[0577] If the terminal determines the uplink transmission power through [Method 1-2],

[0578] If the terminal has set followUnifiedTCIstateSRS, which is an upper layer signaling, within the SRS resource set, the terminal 0_UE_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.

[0579] If the terminal does not receive the upper layer signaling followUnifiedTCIstateSRS within the SRS resource set, the terminal shall set P 0_UE_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 set in the SRS resource with the lowest index within the corresponding SRS resource set, 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 set in the SRS resource with the lowest index within the corresponding SRS resource set.

[0580] srs-PowerControlAdjustmentStates: The UE can be configured with a closed circuit index used when determining SRS transmission power through the corresponding higher layer signaling. If the UE has not been configured with the corresponding higher layer signaling, the UE can share the closed circuit index of the SRS with the first closed circuit index of the PUSCH. If the UE receives the corresponding higher layer signaling set to sameAsFci2, the UE can share the closed circuit index of the SRS with the second closed circuit index of the PUSCH. The UE may be configured with the higher layer signaling to have up to two closed circuit indices for the PUSCH. If the UE receives the higher layer signaling set to separateClosedLoop, the UE can configure the closed circuit index of the SRS separately without sharing it with the closed circuit index of the PUSCH.

[0581] If the UE has received the upper layer signaling unifiedTCI-StateType and the srs-PowerControlAdjustmentStates is set to separateClosedLoop within a specific SRS resource set, the UE may consider the SRS resources included in the SRS resource set to be connected to a separate closed loop index with the PUSCH. The UE may consider the PUSCH and the separate closed loop index as described above, regardless of the closed loop connected to the TCI state indicated by the base station.

[0582] If the UE has received the upper layer signaling unifiedTCI-StateType and has not received the srs-PowerControlAdjustmentStates as separateClosedLoop within a specific SRS resource set (i.e., has not received the srs-PowerControlAdjustmentStates or has received the srs-PowerControlAdjustmentStates as sameAsFci2), the UE may consider that the SRS resources included in the SRS resource set are connected to the first or second closed-loop index connected to the PUSCH. If the closed loop connected to the TCI state indicated by the base station is i0, the UE may consider that the UE 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 the UE 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.

[0583] pathlossReferenceRSList: The terminal can receive a list of reference signals that can measure path loss for determining the transmission power of the SRS through the corresponding upper layer signaling.

[0584] followUnifiedTCI-StateSRS-r17: When the UE operates in an unified TCI state through the corresponding upper layer signaling, i.e., when the UE has set unifiedTCI-StateType, the UE can determine whether the joint TCI state or the UL TCI state indicated through DCI is applied to the SRS resources within the corresponding SRS resource set (followUnifiedTCI-StateSRS: When set to enabled, for SRS resource Set, the UE applies the "indicated" UL only TCI or joint TCI as specified in TS 38.214

[0019] , clause 5.1.5. This parameter may be configured for aperiodic SRS for BM or SRS of any time-domain behavior for codebook, non-codebook, and antenna switching.). If the corresponding upper layer signaling is set to enabled, the UE can apply the joint TCI state or the UL TCI state indicated through DCI to the SRS resources within the corresponding SRS resource set. If the corresponding upper layer signaling is not configured for the terminal, the terminal may be configured with a joint TCI state or UL TCI state for each SRS resource within the corresponding SRS resource set, and may not apply the joint TCI state or UL TCI state indicated through DCI to the 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.

[0585] applyIndicatedTCI-State-r18: The UE can be configured, through the corresponding upper layer signaling, which TCI state to apply to the SRS resources in the SRS resource set for which the corresponding upper layer signaling is configured, when the UE operates in the unified TCI state, i.e., when the UE has been configured with unifiedTCI-StateType and operates in multiple TRPs (applyIndicatedTCI-State: This field indicates, for an SRS-ResourceSet, if the UE applies the first or the second "indicated" UL-only TCI or joint TCI as specified in TS 38.214

[0019] , clause 6.2.1. If more than one value for the field coresetPoolIndex is configured in IE controlResourceSet for the BWP, the value 'first' corresponds to the "joint / UL TCI states specific to coresetPoolIndex value 0 and the value 'second' corresponds to the value 1, respectively. When the UE is configured with two SRS resource sets with usage set to Codebook or nonCodebook, network does not configure the first set with value 'second' or second set with value 'first'. FollowUTCI: The field is absent if the field followUnifiedTCI-State is present. Otherwise, it is optionally present, Need R.). If the terminal has set the followUnifiedTCI-StateSRS-r17, the terminal may not set applyIndicatedTCI-State-r18. The terminal may set the corresponding upper layer signaling within the SRS resource set if the usage of the SRS resource set is set to beam management and the resourceType is aperiodic, or if 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.

[0586] If the terminal operates with single-DCI based multi-TRP, i.e., 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 may 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 corresponding 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 corresponding upper layer signaling set to second, the terminal may 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 corresponding 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 the corresponding 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 within the corresponding SRS resource set, and may not apply the joint TCI state or UL TCI state indicated through DCI to the SRS resources within the corresponding SRS resource set.

[0587] If the terminal operates with multi-DCI based multi-TRP, i.e., if the terminal has two different CORESETPoolIndexes configured, the terminal can apply the joint TCI state or UL TCI state indicated through DCI received in the CORESET with CORESETPoolIndex set to 0 or 1 for one or more SRS resources within the SRS resource set for which the corresponding upper layer signaling is configured, if the corresponding upper layer signaling is configured as first or second. If the terminal has not been configured with the corresponding upper layer signaling and an SRS resource set with resourceType set to aperiodic is triggered through DCI, the terminal can determine the joint TCI state or UL TCI state to apply for one or more SRS resources within the corresponding SRS resource set based on which CORESETPoolIndex the DCI is received from. For example, if the UE has not been configured with the corresponding upper layer signaling, and the UE has configured 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 UE 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 by DCI received within a CORESET with CORESETPoolIndex set to 1, the UE may apply the joint TCI state or UL TCI state indicated by the DCI received within the CORESET with CORESETPoolIndex set to 1 to one or more SRS resources within the corresponding SRS resource set. If the UE has not been configured with the corresponding higher layer signaling, and the UE has not configured the 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 corresponding SRS resource set, and may not apply the joint TCI state or UL TCI state indicated by the DCI to the SRS resources within the corresponding SRS resource set.

[0588] 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.

[0589] [Method 1-1] How to determine the basic transmission power: Applying common transmission power parameters

[0590] A terminal can be configured with an ul-powerControl parameter for each of one or more uplink bandwidth portions 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 portion to all uplink transmissions within each uplink bandwidth portion. 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.

[0591] [Method 1-2] Additional transmission power determination method: Different transmission power parameters can be applied.

[0592] 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.

[0593] 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 use the reference signal for path loss measurement configured and instructed in the integrated TCI state to determine the path loss to be reflected when determining the uplink transmission power. 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.

[0594] The terminal may report to the base station whether it supports at least one combination of [Method 1-1] and [Method 1-2] through a terminal capability report. In addition, the terminal may receive configuration from the base station for at least one combination of [Method 1-1] and [Method 1-2] through upper layer signaling.

[0595] <Example 2: Method for calculating the difference in path loss between a terminal and a base station>

[0596] 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.

[0597] 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.

[0598] Referring to FIG. 13, a terminal (1310) may be connected to and operate a base station 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 the conventional TRP (1300) capable of both uplink reception and downlink transmission, the base station may also operate a TRP (1305) that supports only uplink reception, 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 TRP (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. As an assumption for such a UL-only TRP, the base station and the terminal (1310) may consider at least one or more combinations of the following.

[0599] 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 arbitrary cell coverage.

[0600] The UL-only TRP (1305) does not support downlink transmission functions for all terminals, and can only support uplink reception functions. In other words, the UL-only TRP (1305) is a TRP with relatively low production and installation costs. In addition to existing TRPs, it can additionally receive uplink transmissions from terminals, thereby achieving reception diversity from the base station's perspective.

[0601] 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 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).

[0602] [Method 2-1]

[0603] 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.

[0604] Referring to FIG. 14, a terminal (1400) 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 (1410)) and a UL-only TRP capable of only uplink reception (e.g., TRP2 (1405)). The terminal (1400) and the base station can go through a series of processes of exchanging signals between the terminal (1400) and the base station to obtain information on the amount of path loss between TRP2 (1410) and the terminal (1400).

[0605] [Process 2-1] Uplink transmission of terminal (1400)

[0606] 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.

[0607] [Process 2-2] Calculating the difference in path loss at the base station

[0608] Thereafter, TRP1 (1405) and TRP2 (1410) can receive the uplink transmission of the terminal (1400) and calculate the reception power P1 (1430) and P2 (1425) 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 receive beam gain in TRP1 (1405), the receive beam gain in TRP2 (1410), and the MPE (Maximum Permissible Exposure) value that can determine the transmit power reduction amount for each transmit beam and each transmit beam gain considered when the terminal transmits to TRP1 (1405) and TRP2 (1410) in case of FR2.

[0609] [Process 2-3] Transmitting the difference in path loss to the terminal (1400)

[0610] 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.

[0611] 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).

[0612] Meanwhile, 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. Accordingly, 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.

[0613] [Process 2-4] Uplink transmission of terminal (1400) after obtaining d_P

[0614] 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) can apply the same transmission power parameters (1460). That is, when the terminal (1400) determines the transmission power of the two uplink signals, the terminal (1400) can consider the same p0, alpha, closed loop index, and path loss between TRP1 (1405) and the terminal.

[0615] 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.

[0616] [Process 2-5] Calculating the difference in path loss at the base station

[0617] 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' (1470) and P2' (1465) 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 receive beam gain in TRP1 (1405), the receive beam gain in TRP2 (1410), and the MPE (Maximum Permissible Exposure) value that can determine the transmission power reduction amount for each transmission beam and each transmission beam gain considered when the terminal transmits to TRP1 (1405) and TRP2 (1410) in case of FR2.

[0618] [Process 2-6] Transmitting the difference in path loss to the terminal

[0619] 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.

[0620] 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).

[0621] 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 resourceType, which is the upper layer signaling, 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.

[0622] 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).

[0623] 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).

[0624] 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]).

[0625] For example, if the terminal (1400) determines the uplink transmission power using the first p0, the first alpha, the first closed circuit index, and / or the first path loss in [Process 2-1] and transmits the power to TRP1 (1405) and TRP2 (1410), then the terminal (1400) may be able to determine the uplink transmission power using the second p0, the second alpha, the second closed circuit index, and / or the second path loss in [Process 2-4] and transmit the power to TRP1 (1405) and TRP2 (1410). In this case, 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.

[0626] 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.

[0627] [Method 2-2]

[0628] 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.

[0629] 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 performing 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).

[0630] [Process 3-1] Uplink transmission of terminal (1500)

[0631] 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).

[0632] 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 loop 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).

[0633] [Process 3-2] Calculating the difference in path loss at the base station

[0634] 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 the case of FR2, the MPE (Maximum Permissible Exposure) value that can determine the transmission power reduction amount for each transmission beam and / or each transmission beam gain considered when the terminal (1500) transmits to TRP1 (1505) and TRP2 (1510).

[0635] [Process 3-3] Transmitting the difference in path loss to the terminal (1500)

[0636] 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.

[0637] 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].

[0638] 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.

[0639] [Process 3-4] Uplink transmission of terminal (1500) after obtaining d_P

[0640] 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.

[0641] [Process 3-5] Calculating the difference in path loss at the base station

[0642] 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 P2 and the P2'' may be the same as estimating the amount of change in the d_P value.

[0643] 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 the MPE (Maximum Permissible Exposure) value that can determine the transmission power reduction amount for each transmission beam and each transmission beam gain considered by the terminal when transmitting to TRP2 (1510) in case of FR2. 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).

[0644] [Process 3-6] Transmitting the difference in path loss to the terminal (1500)

[0645] 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 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 transmitting uplink 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, and the change amount d_P'' in addition to the path loss that can be measured through the reference signal for measuring the path loss that can be received from TRP1 (1505).

[0646] 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].

[0647] When the terminal (1500) performs uplink transmission as shown in the above [process 3-1], it can perform SRS transmission based on one or more SRS resources within 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.

[0648] 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, the terminal (1500) may not apply the difference value of the path loss amount when determining the transmission power as described above, even if it is an uplink transmission for TRP2 (1510).

[0649] When the terminal (1500) performs uplink transmission as shown in the above [process 3-4], it can perform SRS transmission based on one or more SRS resources within 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.

[0650] 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].

[0651] 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.

[0652] 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 at this time, 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.

[0653] 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).

[0654] 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.

[0655] Through the above-described [Method 2-1] and [Method 2-2], a terminal (e.g., terminal (1500 or 1500)) can use the modified transmission power calculation formula as follows when determining uplink transmission power for UL-only TRP.

[0656] 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. In [Equation 11] below, can be regarded as the d_P value, which is the difference in path loss, may mean that the difference in the corresponding path loss corresponds to one or more path loss measurement reference signals. The terminal If it corresponds to one path loss measurement reference signal, = q d It can be considered as

[0657] [Equation 11]

[0658]

[0659] 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 [Equation 12] or [Equation 13] below, can be regarded as the d_P value, which is the difference in path loss, may mean that the difference in the corresponding path loss corresponds to one or more path loss measurement reference signals. 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. They can be distinguished based on whether the value is directly applied to the path loss amount.

[0660] [Equation 12]

[0661]

[0662] [Equation 13]

[0663]

[0664] 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 [Equation 14] or [Equation 15] below, can be regarded as the d_P value, which is the difference in path loss, may mean that the difference in the corresponding path loss corresponds to one or more path loss measurement reference signals. The terminal If it corresponds to one path loss measurement reference signal, = q dIt can be considered as [Mathematical Formula 14] or [Mathematical Formula 15] below is the difference in path loss. They can be distinguished based on whether the value is directly applied to the path loss amount.

[0665] [Equation 14]

[0666]

[0667] [Equation 15]

[0668]

[0669] 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.

[0670] 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.

[0671] 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].

[0672] <Third Embodiment: Uplink Scheduling Method Based on Difference Values ​​in Path Loss>

[0673] 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.

[0674] 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.

[0675] 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.

[0676] 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. In this case, 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.

[0677] [Method 3-1]

[0678] A terminal can receive one or more joint TCI states or UL TCI states from a base station through upper layer signaling, and at this time, as shown in [Table 30] below, the terminal can receive information on the difference value of path loss within one or more joint TCI states or UL TCI states.

[0679] [Table 30]

[0680]

[0681] 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.

[0682] In one embodiment, Xs and Xe can be 0 and natural numbers (e.g., 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.

[0683] 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.

[0684] 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 reported as differential RSRPs that can be expressed as differences with respect to the largest value, and at this time, 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.

[0685] 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.

[0686] 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.

[0687] 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.

[0688] When using the above [Method 3-1], the terminal can receive different path loss difference values ​​from the base station for each TCI state, so even if the same path loss reference signal is set within each TCI state using different TCI states, the terminal can calculate different path losses using the different path loss difference values ​​set within each TCI state. Through the above method, the terminal can easily use multiple path loss difference values ​​if one or more UL-only TRPs are installed in the network to which the terminal is connected. However, when the terminal uses the above method, the number of path loss difference values ​​that the terminal and the base station must manage increases, and the update thereof must be supported for each TCI state, which may consume a lot of signaling overhead.

[0689] The terminal can use the above [Method 3-1] when transmitting at least one channel / signal among PUSCH, PUCCH, SRS, and PRACH. If the terminal applies the above [Method 3-1] to the terminal's PUSCH, PUCCH, and SRS transmission, the terminal can calculate the transmission power by applying the difference value of the path loss amount included in the TCI state indicated by the base station when transmitting the corresponding uplink channel / signal. If the terminal applies the above [Method 3-1] to PRACH transmission, the terminal can apply it to PRACH transmission that can be triggered by DCI format 1_0, and the base station and the terminal can define a new field in the DCI format 1_0, and the terminal can receive one TCI state from among a maximum of two joint TCI states (if the terminal has received the upper layer signaling unifiedTCI-StateType set to joint) or a maximum of two UL TCI states (if the terminal has received the upper layer signaling unifiedTCI-StateType set to separate) currently indicated and applied by the base station to the terminal, and can use the difference value of the path loss amount set in the corresponding TCI state to determine the transmission power of the PRACH. At this time, the size of the new field in DCI format 1_0 can be 1 bit, and if the terminal is instructed to be 0 through the new field, the terminal can determine the transmission power of the PRACH by applying the difference value of the path loss amount set in the first TCI state instructed and applied to the terminal, and if the terminal is instructed to be 1 through the new field, the terminal can determine the transmission power of the PRACH by applying the difference value of the path loss amount set in the second TCI state instructed and applied to the terminal.If the difference value of path loss is not set within the first and / or second TCI states, the terminal may not apply the difference value of path loss when determining the transmission power of the PRACH. In other words, this may have the same effect as the terminal considering the difference value of path loss as 0 dB and applying it when determining the transmission power of the PRACH.

[0690] The terminal can set the difference value of the path loss amount through upper layer signaling in the joint TCI state or UL TCI state as shown in [Table 30] above (an example of setting the difference value of the path loss amount through pathlossOffset is written in [Table 30] above, and the parameter name pathlossOffset is only an example, and other parameter names that can indicate the difference value of the path loss amount may also be possible, and regardless of the parameter name used, the meaning expressed by the parameter can be the difference value of the path loss amount) and update it through MAC-CE. The terminal can consider at least one combination of the following items as information that can be included in the MAC-CE signaling.

[0691] Serving cell ID field (e.g. 5 bits)

[0692] Downlink bandwidth part ID field (e.g. 2 bits)

[0693] Uplink bandwidth part ID field (e.g. 2 bits)

[0694] Path loss measurement reference signal ID field (e.g. 6 bits)

[0695] Path loss measurement reference signal group field (e.g. 2 bits)

[0696] Activated path loss measurement reference signal ID field (e.g. 2 bits)

[0697] Path loss difference value (d_P) field (e.g. 5 to 8 bits)

[0698] Variance of path loss difference value (d_P'') field (e.g. 5 to 8 bits)

[0699] A field indicating the number of joint TCI states or UL TCI states (if the number of joint TCI states or UL TCI states that can be indicated through the corresponding MAC-CE is at most N, the number of joint TCI states or UL TCI states can have ceil(log2(N))-bits, where ceil(.) means a rounding function and log2(.) means a logarithmic function with base 2. If the corresponding MAC-CE always indicates 1 joint TCI state or 1 UL TCI state, the field may not exist.)

[0700] Joint TCI state or UL TCI state field (7 or 6 bits, respectively)

[0701] As an example of a combination of MAC-CE signaling configuration information, a terminal may expect that the MAC-CE signaling includes at least a Serving cell ID field, a downlink bandwidth part ID field, an uplink bandwidth part ID field, a path loss difference value (d_P) field, one or more joint TCI states, or one or more UL TCI state fields.

[0702] The terminal may receive the MAC-CE signaling and update the difference value of the path loss amount set in one or more joint TCI states that can be indicated through the MAC-CE, which are set in the downlink bandwidth portion that can be indicated through the MAC-CE, to the difference value of the path loss amount that can be indicated through the MAC-CE. That is, the terminal may update the difference value of the path loss amount that can be indicated through the MAC-CE equally for the difference values ​​of the path loss amounts that can be the same or different, which are respectively set in one or more joint TCI states that can be indicated through the MAC-CE.

[0703] Alternatively, the terminal may receive the MAC-CE signaling and update the difference value of the path loss amount set in one or more UL TCI states that can be indicated through the MAC-CE, which are set in the uplink bandwidth portion that can be indicated through the MAC-CE, to the difference value of the path loss amount that can be indicated through the MAC-CE. That is, the terminal may update the difference value of the path loss amount that can be indicated through the MAC-CE equally for the difference values ​​of the path loss amounts that can be the same or different, which are respectively set in one or more UL TCI states that can be indicated through the MAC-CE.

[0704] Additionally, the terminal may support simultaneous updating of the difference values ​​of path loss amounts set within multiple joint TCI states or UL TCI states. To this end, the terminal may receive upper layer signaling configured for each bandwidth segment, cell, or cell group.

[0705] As an example (simultaneous update method 1: using conventional parameters (UTCI cell list); applying the same update to all cells in the list), the terminal can be configured with simultaneousU-TCI-UpdateList1-r17, simultaneousU-TCI-UpdateList2-r17, simultaneousU-TCI-UpdateList3-r17, or simultaneousU-TCI-UpdateList4-r17 by the corresponding upper layer signaling, and each parameter can include the index of the serving cell. If a terminal receives a MAC-CE instructing to update a difference value of path loss for one or more joint TCI states or UL TCI states within a specific serving cell, and if an index of the corresponding serving cell is included in one or more upper layer signalings among simultaneousU-TCI-UpdateList1-r17, simultaneousU-TCI-UpdateList2-r17, simultaneousU-TCI-UpdateList3-r17, or simultaneousU-TCI-UpdateList4-r17, and the one or more upper layer signalings including the index of the corresponding serving cell include indices of one or more other serving cells, the terminal may equally apply the instruction information of the MAC-CE to one or more other serving cells included in the one or more upper layer signalings including the index of the corresponding serving cell.The terminal can report terminal capabilities to the base station, meaning that the terminal can apply the above list to update the difference value of the path loss amount, and the information that can be included in the terminal capability signaling may include the maximum number of lists that the terminal can be configured and the maximum number of serving cells that can be included in the lists that the terminal can be configured. The reporting unit of the terminal capability signaling may be per UE (terminal), per band (band), per band combination (band combination), per feature set (feature set), or per FSPC (feature set per component carrier).

[0706] As another example (simultaneous update method 2-1: use of new parameters (joint TCI state list); same update applied to all TCI states in the list), the terminal can receive one or more lists of one or more joint TCI states in the downlink bandwidth section through the corresponding upper layer signaling. If the terminal receives a MAC-CE instructing to update the difference value of the path loss amount, if some or all of the one or more joint TCI states indicated in the MAC-CE are each included in the list of one or more joint TCI states, the terminal can update all joint TCI states in each list with the difference value of the path loss amount instructed to be updated by the MAC-CE.

[0707] At this time, the number of the above lists set to the terminal may be limited to 1, or more than 1 may be set.

[0708] In addition, the difference value of the path loss amount indicated to the terminal through MAC-CE may be 1, and the 1 may be equally applied to 1 or more joint TCI states indicated by the same MAC-CE. In this case, the terminal may expect that the field for the difference value of the path loss amount is located first in the MAC-CE, and then the fields for 1 or more joint TCI states exist, and the value indicated through the field for the difference value of the path loss amount located first may be commonly applied to all joint TCI states that may be indicated through the fields for 1 or more joint TCI states that exist thereafter.

[0709] In addition, the difference values ​​of the path loss amount indicated to the terminal through MAC-CE may be one or more, and each of the difference values ​​of one or more path losses may be applied to a subset of one or more joint TCI states indicated by the same MAC-CE. In this case, the terminal may expect that a field indicating one of the difference values ​​of one or more path losses is located first in the MAC-CE, and then a field for one or more joint TCI states to which the difference value of one path loss amount is to be applied exists, and then such field arrangement may be repeated to configure the MAC-CE field.

[0710] At this time, it can be considered that one or more joint TCI states included in the list of one or more joint TCI states have all received an initial setting for the difference value of the path loss amount through upper layer signaling. At this time, the initial setting value can include 0. If the terminal does not receive an initial setting for the difference value of the path loss amount for a specific joint TCI state, the terminal may not expect that such joint TCI state is included in the list of the joint TCI state. If the terminal does not receive an initial setting for the difference value of the path loss amount for a specific joint TCI state, the terminal may consider such joint TCI state to be the same as if the difference value of the path loss amount is set to 0, and if such joint TCI state is included in the list of the joint TCI state, the terminal may apply a method of updating the difference value of the path loss amount through the corresponding MAC-CE for the corresponding joint TCI state.

[0711] A terminal can report terminal capabilities to a base station, meaning that it supports the above list, and information that can be included in the terminal capability signaling may include the maximum number of lists that the terminal can configure, and the maximum number of joint TCI states that can be included in the lists that the terminal can configure. The reporting unit of the terminal capability signaling may be per UE, per band, per band combination, per feature set, or per FSPC (feature set per component carrier).

[0712] For example, if the terminal has received the first joint TCI state to the sixteenth joint TCI state through upper layer signaling, and has received the first joint TCI state list and the second joint TCI state list, and the first joint TCI state list includes the first joint TCI state to the eighth joint TCI state, and the second joint TCI state list includes the ninth joint TCI state to the sixteenth joint TCI state, it can be considered that the terminal receives a MAC-CE that updates the difference value of one path loss amount while including the indexes of the first joint TCI state and the ninth joint TCI state, the terminal can update not only the first joint TCI state and the ninth joint TCI state, but also the other joint TCI states in the first joint TCI state list including the first joint TCI state, and the other joint TCI states in the second joint TCI state list including the ninth joint TCI state, to the difference value of one path loss amount indicated by the MAC-CE.

[0713] As another example, a case may be considered where the terminal receives the first joint TCI state to the sixteenth joint TCI state through upper layer signaling, receives the first joint TCI state list and the second joint TCI state list, and the first joint TCI state list includes the first joint TCI state to the eighth joint TCI state, and the second joint TCI state list includes the ninth joint TCI state to the sixteenth joint TCI state. At this time, if the terminal receives a MAC-CE that updates the difference value of two path losses while including the indexes of the first joint TCI state and the ninth joint TCI state, and is instructed that the difference value of the first path loss is applied to the first joint TCI state and the difference value of the second path loss is applied to the ninth joint TCI state, the terminal can use the difference value of the first path loss to update not only the first joint TCI state but also the remaining other joint TCI states in the first joint TCI state list including the first joint TCI state, and can use the difference value of the second path loss to update not only the ninth joint TCI state but also the remaining other joint TCI states in the second joint TCI state list including the ninth joint TCI state.

[0714] As another example (simultaneous update method 2-2: using new parameters (UL tci state list); applying the same update to all tci states in the list), the terminal can be configured with a list of one or more UL TCI states in the uplink bandwidth section by the corresponding upper layer signaling. If the terminal receives a MAC-CE instructing to update the difference value of the path loss amount, if some or all of the one or more UL TCI states indicated in the MAC-CE are each included in the one or more UL TCI state lists, the terminal can update all UL TCI states in each list with the difference value of the path loss amount indicated to be updated by the MAC-CE.

[0715] At this time, the number of the above lists set to the terminal may be limited to 1, or more than 1 may be set.

[0716] In addition, the difference value of the path loss amount indicated to the terminal through the MAC-CE may be 1, and the 1 may be equally applied to 1 or more UL TCI states indicated by the same MAC-CE. In this case, the terminal may expect that the field for the difference value of the path loss amount is located first in the MAC-CE, and then the fields for 1 or more UL TCI states exist, and the value indicated through the field for the difference value of the path loss amount located first may be commonly applied to all UL TCI states that may be indicated through the fields for 1 or more UL TCI states that exist thereafter.

[0717] In addition, the difference values ​​of the path loss amount indicated to the terminal through the MAC-CE may be more than one, and each of the difference values ​​of the path loss amount may be applied to a subset of one or more UL TCI states indicated by the same MAC-CE. In this case, the terminal may expect that a field indicating one of the difference values ​​of the one or more path losses is located first in the MAC-CE, and then a field for one or more UL TCI states to which the difference value of the one path loss amount is to be applied exists, and then such field arrangement may be repeated to configure the MAC-CE field.

[0718] At this time, it can be considered that all of the UL TCI states included in the list of one or more UL TCI states have received an initial setting for the difference value of the path loss amount through upper layer signaling. At this time, the initial setting value can include 0. If the terminal does not receive an initial setting for the difference value of the path loss amount for a specific UL TCI state, the terminal may not expect that such UL TCI state is included in the list of the UL TCI state. If the terminal does not receive an initial setting for the difference value of the path loss amount for a specific UL TCI state, the terminal may consider such UL TCI state as having the difference value of the path loss amount set to 0, and if such UL TCI state is included in the list of the UL TCI state, the terminal may apply a method of updating the difference value of the path loss amount through the corresponding MAC-CE for the corresponding UL TCI state.

[0719] A terminal can report terminal capabilities to a base station, meaning that it supports the above list, and information that can be included in the terminal capability signaling may include the maximum number of lists that the terminal can configure, and the maximum number of UL TCI states that can be included in the lists that the terminal can configure. The reporting unit of the terminal capability signaling may be per UE, per band, per band combination, per feature set, or per FSPC (feature set per component carrier).

[0720] For example, if a terminal is configured with the first UL TCI state to the sixteenth UL TCI state through upper layer signaling, and a first UL TCI state list and a second UL TCI state list are configured, and the first UL TCI state list includes the first UL TCI state to the eighth UL TCI state, and the second UL TCI state list includes the ninth UL TCI state to the sixteenth UL TCI state, it can be considered a case. At this time, if the terminal receives a MAC-CE that updates the difference value of one path loss amount while including the indexes of the first UL TCI state and the ninth UL TCI state, the terminal can update the difference value of one path loss amount indicated by the MAC-CE not only for the first UL TCI state and the ninth UL TCI state, but also for the remaining other UL TCI states in the first UL TCI state list including the first UL TCI state, and for the remaining other UL TCI states in the second UL TCI state list including the ninth UL TCI state.

[0721] As another example, a case may be considered where a terminal is configured with a first UL TCI state to a sixteenth UL TCI state through upper layer signaling, a first UL TCI state list and a second UL TCI state list are configured, and the first UL TCI state list includes the first UL TCI state to the eighth UL TCI state, and the second UL TCI state list includes the ninth UL TCI state to the sixteenth UL TCI state. At this time, if the terminal receives a MAC-CE that updates the difference value of two path losses while including the indexes of the first UL TCI state and the ninth UL TCI state, and is instructed that the difference value of the first path loss is applied to the first UL TCI state and the difference value of the second path loss is applied to the ninth UL TCI state, the terminal can update not only the first UL TCI state but also the remaining other UL TCI states in the first UL TCI state list including the first UL TCI state using the difference value of the first path loss, and can update not only the ninth UL TCI state but also the remaining other UL TCI states in the second UL TCI state list including the ninth UL TCI state using the difference value of the second path loss.

[0722] As another example, the terminal may be configured with one or more joint TCI state lists or one or more UL TCI state lists as described above, and may additionally be configured with one or more serving cell lists. When the terminal receives a MAC-CE indicating an update of a difference value of a path loss amount, if one or more joint TCI states or one or more UL TCI states indicated by the MAC-CE are included in the one or more joint TCI state lists or one or more UL TCI state lists, the terminal may also update all other joint TCI states or all other UL TCI states in the one or more joint TCI state lists or one or more UL TCI state lists with the same difference value of a path loss amount indicated by the MAC-CE, and if a list of serving cells including the serving cell exists, the terminal may also update one or more joint TCI states or one or more UL TCI states in other serving cells included in the list of the serving cell with the same difference value of a path loss amount indicated by the MACC-E.If there is one or more joint TCI state lists or one or more UL TCI state lists including one or more joint TCI states or one or more UL TCI states indicated by MAC-CE in another serving cell included in the list of serving cells, the terminal may also update all other joint TCI states or all other UL TCI states in one or more joint TCI state lists or one or more UL TCI state lists including one or more joint TCI states or one or more UL TCI states indicated by MAC-CE in another serving cell included in the list of serving cells including the serving cell that received the MAC-CE, with the difference value of the same path loss amount indicated by the MAC-CE.

[0723] After the terminal receives the corresponding MAC-CE from the base station, 3 slots after the PUCCH transmission including HARQ-ACK information for the PDSCH including the corresponding 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.

[0724] In the case where the terminal updates the difference value of the path loss amount to the value received by the MAC-CE signaling as in [Method 3-1], the terminal can update the difference value of the path loss amount relatively dynamically in addition to the method of setting it semi-statically, so 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 a new MAC-CE signaling, the base station must be able to periodically measure the difference value of the path loss amount, and the delay time when exchanging information between TRPs may not be large.

[0725] [Method 3-2]

[0726] The terminal can receive a path loss difference value from the base station via upper-layer signaling. This path loss difference value may vary by bandwidth segment, or it may vary by cell, 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.

[0727] 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.

[0728] 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.

[0729] The terminal can receive a path loss difference value set by the base station through upper layer signaling. The path loss difference value setting may vary by bandwidth part, or may vary by cell, so that the same value is set for all bandwidth parts 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 can operate both uplink and downlink 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 upper layer signaling.

[0730] 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.

[0731] 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.

[0732] 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.

[0733] 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.

[0734] 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.

[0735] 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.

[0736] The terminal can use the above [Method 3-2] when transmitting at least one channel / signal among PUSCH, PUCCH, SRS, and PRACH. If the terminal uses the above [Method 3-2] when transmitting PRACH, the terminal can apply it to PRACH transmission that can be triggered by DCI format 1_0, and the base station and the terminal can define a new field in DCI format 1_0, and the terminal can be instructed of a difference value of one path loss amount through the new field. The terminal can receive N≥1 difference values ​​of path losses set in PRACH-config through upper layer signaling, and at this time, the bit length of the new field It can be, means the raising function can mean a logarithmic function with base 2.

[0737] A terminal may report terminal capability signaling to a base station, which means that it supports the above [Method 3-1] or [Method 3-2]. The terminal may define the terminal capability signaling as individual terminal capabilities, or may define different components within a single terminal capability signaling. The terminal may use one of the following methods as a reporting unit for the terminal capability signaling for the above [Method 3-1] or [Method 3-2]: per UE, per band, per band combination, per FS, and per FSPC (feature set per component carrier).

[0738] If the terminal reports terminal capability signaling to the base station, which means that it supports the above [Method 3-1] or [Method 3-2], the base station can set upper layer signaling to the terminal, and based on this, the terminal can perform operations for the above [Method 3-1] and / or [Method 3-2]. At this time, the upper layer signaling from the base station can be individually defined for the above [Method 3-1] or [Method 3-2], or can mean that the above [Method 3-1], the above [Method 3-2], or both the above [Method 3-1] and [Method 3-2] can be supported, depending on the value of one upper layer signaling.

[0739] The terminal may determine whether to apply the difference value of the path loss amount by considering at least one combination of [Method 3-1] or [Method 3-2] when performing a dynamic grant-based PUSCH transmission scheduled based on DCI, a Type-2 configured grant-based PUSCH transmission activated through DCI, a Type-1 configured grant-based PUSCH transmission configured through upper layer signaling, a PUCCH transmission, an SRS transmission, or a PRACH transmission.

[0740] FIG. 16 is a diagram illustrating the operation of a terminal for determining an uplink transmission method according to one embodiment of the present disclosure.

[0741] 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 at this time may include at least one combination of terminal capabilities related to PUSCH, PUCCH, SRS transmission and transmission power parameters, terminal capabilities related to integrated TCI state operation, and terminal capabilities indicating whether to support [Method 2-1], [Method 2-2], [Method 3-1] to [Method 3-3]. Step 1600 may also be omitted.

[0742] In step 1605, the terminal may receive upper layer signaling from the base station according to the reported terminal capability. At this time, 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 for [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-3], and use one of them.

[0743] In step 1610, the terminal may receive uplink transmission scheduling information from the base station. The terminal may receive information on a difference value of the path loss amount through a combination of at least one of the methods [Method 3-1] to [Method 3-3]. In addition, the terminal may be notified of at least one of a dynamic grant-based PUSCH transmission scheduled based on DCI, a Type-2 configured grant-based PUSCH transmission activated through DCI, a Type-1 configured grant-based PUSCH transmission configured through upper layer signaling, periodic, semi-persistent, or aperiodic PUCCH transmission, periodic, semi-persistent, or aperiodic SRS transmission, and PRACH transmission through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling.

[0744] In step 1615, the terminal can determine different uplink transmission operations according to the conditions of the uplink transmission scheduling information received in step 1610. If the uplink transmission scheduling information received by the terminal in step 1610 includes information related to the difference value of the path loss amount, the terminal can perform the first uplink transmission operation (1620). That is, the uplink transmission operation of the terminal can be understood as uplink transmission for UL-only TRP. If the uplink transmission scheduling information received by the terminal in step 1610 does not include information related to the difference value of the path loss amount, the terminal can perform the second uplink transmission operation (1625). That is, the uplink transmission operation of the terminal can be understood as uplink transmission for a TRP that can operate in both uplink and downlink.

[0745] 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.

[0746] FIG. 17 is a diagram illustrating the operation of a base station for determining an uplink transmission method according to one embodiment of the present disclosure.

[0747] 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 reported at this time may include at least one combination of terminal capabilities related to PUSCH, PUCCH, SRS transmission and transmission power parameters, terminal capabilities related to integrated TCI state operation, and terminal capabilities indicating whether to support [Method 2-1], [Method 2-2], [Method 3-1] to [Method 3-3]. Step 1700 may also be omitted.

[0748] In step 1705, the base station may transmit upper layer signaling to the terminal according to the terminal capability reported by the terminal. At this time, the base station may 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 in [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-3], and use one of them.

[0749] In step 1710, the base station may transmit uplink transmission scheduling information to the terminal. The base station may transmit information on a difference value of path loss to the terminal through a combination of at least one of the methods [Method 3-1] to [Method 3-3]. In addition, the base station may notify the terminal of at least one of dynamic grant-based PUSCH transmission scheduled based on DCI, Type-2 configured grant-based PUSCH transmission activated through DCI, Type-1 configured grant-based PUSCH transmission configured through higher layer signaling, periodic, semi-persistent, or aperiodic PUCCH transmission, periodic, semi-persistent, or aperiodic SRS transmission, and PRACH transmission through a combination of at least one of higher layer signaling, MAC-CE signaling, and L1 signaling.

[0750] In step 1715, the base station can determine different uplink transmission operations according to the conditions of the uplink transmission scheduling information transmitted to the terminal in step 1710. If the uplink transmission scheduling information transmitted by the base station in step 1710 includes information related to the difference value of the path loss amount, the base station can perform a first uplink reception operation (1720). That is, the base station can understand that the uplink transmission operation of the terminal is uplink reception in UL-only TRP. If the uplink transmission scheduling information transmitted by the base station in step 1710 does not include information related to the difference value of the path loss amount, the base station can perform a second uplink reception operation (1725). That is, the base station can understand that the uplink transmission operation of the terminal is uplink reception in a TRP that can operate in both uplink and downlink.

[0751] 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.

[0752] FIG. 18 is a diagram illustrating a MAC-CE structure for separate DL or UL TCI state activation and indication based on an integrated TCI framework for multi-TRP support according to one embodiment of the present disclosure.

[0753] Serving Cell ID (1800): This field can indicate which serving cell the MAC-CE is applied to. This field can be 5 bits long. If the serving cell indicated by this field is included in one or more of the upper layer signaling lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0754] DL BWP ID (1805): This field can indicate which downlink bandwidth part the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. This field can be 2 bits long.

[0755] UL BWP ID (1810): This field can indicate which uplink bandwidth part the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. This field can be 2 bits long.

[0756] Fi,j (1815): This field indicates whether the jth DL TCI state exists in the ith code point of the TCI state field in DCI format 1_1 or 1_2, and j can be 1 or 2. If this field is 1, the terminal can assume that the jth DL TCI state exists in the ith code point of the TCI state field, and if this field is 0, the terminal can assume that the jth DL TCI state does not exist in the ith code point of the TCI state field.

[0757] Si,j (1820): This field indicates whether the jth UL TCI state exists in the ith code point of the TCI state field in DCI format 1_1 or 1_2, and j can be 1 or 2. If this field is 1, the terminal can assume that the jth UL TCI state exists in the ith code point of the TCI state field, and if this field is 0, the terminal can assume that the jth UL TCI state does not exist in the ith code point of the TCI state field.

[0758] TCI state ID (1825): This field can indicate a TCI state that can be identified by the upper layer signaling TCI-StateId. If the TCI state ID field of a specific octet indicates a DL TCI state, this field can be used to express a TCI-StateId that can be expressed in 7 bits. If the TCI state ID field of a specific octet indicates a UL TCI state, 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 UL-TCIState-Id, which is a higher layer signaling. The maximum number of separate TCI states that can be activated is 32 in total, with a maximum of 16 DL TCI states and a maximum of 16 UL TCI states.

[0759] R (1830): Indicates a reserved bit and can be set to 0.

[0760] FIG. 19 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.

[0761] Serving Cell ID (1900): This field can indicate which serving cell the MAC-CE is to be applied to. This field can be 5 bits long. If the serving cell indicated by this field is included in one or more of the upper layer signaling lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0762] DL BWP ID (1905): This field can indicate which downlink bandwidth part the MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. This field can be 2 bits long.

[0763] Fi,j (1910): This field indicates whether the j-th joint TCI state exists in the i-th code point of the TCI state field in DCI format 1_1 or 1_2, and j can be 1 or 2. If this field is 1, the terminal can assume that the j-th joint TCI state exists in the i-th code point of the TCI state field, and if this field is 0, the terminal can assume that the j-th joint TCI state does not exist in the i-th code point of the TCI state field.

[0764] TCI State ID (1915): This 7-bit field can indicate a TCI state, which can be identified by the upper layer signaling TCI-StateId. The maximum number of joint TCI states that can be activated is 16.

[0765] R (1920): This represents a reserved bit and can be set to 0.

[0766] A terminal can be configured with up to four carrier lists from a base station via upper layer signaling (for example, the four carrier lists can be simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4). If a TCI state is indicated to a terminal within a specific cell, the cell is included in a specific carrier list, and other cells are included in the carrier list in addition to the cell, the terminal can commonly apply the indicated TCI state to all cells within the carrier list.

[0767] The terminal may assume that all cells within a specific carrier list have the same multi-TRP configuration. For example, the terminal may expect all cells within a specific carrier list to operate under a single TRP. In another example, the terminal may expect all cells within a specific carrier list to operate under the single-DCI-based multi-TRP. In another example, the terminal may expect all cells within a specific carrier list to operate under the multi-DCI-based multi-TRP.

[0768] The UE may assume that all cells within a specific carrier list have the upper layer signaling, unifiedTCI-StateType-r17, set to the same value. For example, the UE may expect all cells within a specific carrier list to have the upper layer signaling, unifiedTCI-StateType-r17, set separately. In another example, the UE may expect all cells within a specific carrier list to have the upper layer signaling, unifiedTCI-StateType-r17, set jointly.

[0769] In order to support the above-described UL-only TRP, the terminal may be notified of the single-DCI-based multi-TRP technique from the base station in a multi-TRP support manner when the base station configures specific upper layer signaling or configures a difference value of the path loss amount. Conversely, in order to support the above-described UL-only TRP, the terminal may not be notified of the multi-DCI-based multi-TRP technique from the base station in a multi-TRP support manner.

[0770] The multi-DCI-based multi-TRP technique is a method in which, in situations where the connection between TRPs is not smooth and the backhaul is non-ideal, each TRP instructs the UE to schedule independently for each TRP by sending a PDCCH within a control resource set with a different coresetPoolIndex. In a multi-TRP environment that includes UL-only TRPs, only one TRP can perform downlink transmission, and scheduling for the UL-only TRP must also be managed in a TRP that can operate both uplink and downlink. In a multi-TRP environment that includes UL-only TRPs, a single-DCI-based multi-TRP scheme that can manage scheduling for one or more TRPs with a single DCI may be appropriate, assuming smooth connection between TRPs and ideal backhaul. Therefore, unless otherwise stated, the single-DCI-based multi-TRP scheme can be assumed when a UE receives notification from a base station to support UL-only TRPs.

[0771] <Example 4: Terminal requirements related to the difference in path loss amount>

[0772] In one embodiment of the present disclosure, the requirements of a terminal are described when communicating with a TRP that supports only uplink reception using the difference in path loss between the terminal and the base station. This embodiment can be operated in combination with other embodiments.

[0773] The terminal can be instructed or updated by the base station regarding the difference value of the path loss amount applicable to PUSCH, PUCCH, and SRS through the following two methods.

[0774] [Method 4-1]

[0775] The terminal can apply the difference value of the path loss to the PUSCH, PUCCH, and SRS to which the joint TCI state or UL TCI state or UL TCI state can be applied by receiving the joint TCI state or UL TCI state in which the difference value of the path loss is set through DCI. The terminal can also apply the difference value of the path loss based on the application time of the TCI state indicated through DCI. That is, the terminal can apply and use the TCI state from the first slot that appears after the number of symbols equal to the BAT (beam application time) from the end point of the PUCCH or PUSCH transmission including HARQ-ACK information for the DCI indicating the TCI state, and the difference value of the path loss set within the TCI state can also be used when calculating the uplink transmission power.

[0776] [Method 4-2]

[0777] The terminal can update the configured path loss difference value through MAC-CE for a joint TCI state or UL TCI state for which a path loss difference value has been set. At this time, the joint TCI state or UL TCI state can update the configured path loss difference value not only for a TCI state activated in the TCI state field of the DCI, but also for a TCI state that has been set to the terminal and has not been activated in the TCI state field of the DCI. The terminal can calculate the uplink transmission power by applying the path loss difference value updated with the MAC-CE after 3 slots from the PUCCH or PUSCH transmission including HARQ-ACK information for the PDSCH includ...

Claims

1. In a method for uplink transmission of a terminal (UE) in a wireless communication system, An operation of receiving a control message from a base station through upper layer signaling, which includes configuration information regarding uplink transmission and support information regarding a TRP (transmit and receive point) capable of only uplink reception; An operation of receiving information about the difference value of the path loss amount of the terminal from the base station; and A method characterized by including an operation of transmitting an uplink message to the base station based on a difference value between the control message and the path loss amount.

2. In paragraph 1, A method characterized in that the difference value of the above path loss amount is greater than or equal to X and less than or equal to Y, and each of X and Y is set to a value in units of 4 dB as a positive or negative integer.

3. In paragraph 2, A method characterized in that the above X is -12 dB and the above Y is 60 dB.

4. In paragraph 1, A method characterized in that the difference value of the above path loss amount is applied to the difference value of the path loss amount that can be set in the SRS (sounding reference signal) resource set.

5. In paragraph 1, A method characterized in that the difference value of the above path loss amount is applied to the difference value of the path loss amount that can be set in the TCI (transmission configuration indicator) -state or TCI-UL-state.

6. A method for scheduling uplink transmission of a base station in a wireless communication system, An operation of transmitting a control message to a terminal (UE) via upper layer signaling, the control message including configuration information regarding uplink transmission and support information regarding a transmit and receive point (TRP) capable of only uplink reception; An operation of transmitting information about the difference value of the path loss amount of the terminal to the terminal; and A method characterized by including an operation of receiving an uplink message transmitted based on a difference value between the control message and the path loss amount from the terminal.

7. In paragraph 6, A method characterized in that the difference value of the above path loss amount is greater than or equal to X and less than or equal to Y, and each of X and Y is set to a value in units of 4 dB as a positive or negative integer.

8. In paragraph 7, A method characterized in that the above X is -12 dB and the above Y is 60 dB.

9. In paragraph 6, A method characterized in that the difference value of the above path loss amount is applied to the difference value of the path loss amount that can be set in the SRS (sounding reference signal) resource set.

10. In paragraph 6, A method characterized in that the difference value of the above path loss amount is applied to the difference value of the path loss amount that can be set in the TCI (transmission configuration indicator) -state or TCI-UL-state.

11. In a terminal (UE) performing uplink transmission in a wireless communication system, Transmitter and receiver; and A processor coupled to the above transceiver, the processor comprising: Through upper layer signaling, a control message including configuration information for uplink transmission and support information for a TRP (transmit and receive point) capable of only uplink reception is received from the base station, Receive information about the difference value of the path loss amount of the terminal from the base station, A terminal characterized in that it controls to transmit an uplink message to the base station based on the difference value between the control message and the path loss amount.

12. In paragraph 11, A terminal characterized in that the difference value of the above path loss amount is greater than or equal to X and less than or equal to Y, and each of the X and the Y is set as a value in units of 4 dB as a positive or negative integer.

13. In paragraph 12, A terminal characterized in that the above X is -12 dB and the above Y is 60 dB.

14. In paragraph 11, A terminal characterized in that the difference value of the above path loss amount is applied to the difference value of the path loss amount that can be set in the SRS (sounding reference signal) resource set.

15. In a base station for scheduling uplink transmission in a wireless communication system, Transmitter and receiver; and A processor coupled to the above transceiver, the processor comprising: Controls transmission of a control message to a terminal (UE) via upper layer signaling, including configuration information regarding uplink transmission and support information for a TRP (transmit and receive point) capable of only uplink reception; Transmit information about the difference value of the path loss amount of the above terminal to the above terminal, A base station characterized in that it controls to receive an uplink message transmitted based on the difference value between the control message and the path loss amount from the terminal.

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