Method and device for transmitting power headroom report for multiple-transmit / receive point environment in wireless communication system

Abstract

The present disclosure is for transmitting a power headroom report for a multiple-transmit / receive point (M-TRP) environment in a wireless communication system. An operating method of a terminal may comprise the steps of: establishing connections for a plurality of TRPs; receiving configuration information including information indicating that a plurality of power headroom reports (PHRs) for the plurality of TRPs is to be reported; generating a plurality of PHRs on the basis of a plurality of transmission configuration indicators (TCIs) linked to the plurality of TRPs; and transmitting the plurality of PHRs through at least one of uplink channels of the plurality of TRPs.

Description

Method and device for transmitting power headroom reports for a multi-transmission / reception point environment in a wireless communication system

[0001] The present disclosure relates to a method and apparatus for transmitting a power headroom report for a multiple-transmit / receive point (M-TRP) environment in a wireless communication system.

[0002] Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) are being developed to provide improved communication services compared to existing communication networks (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), etc.). 5G communication networks (e.g., new radio (NR) communication networks) can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. That is, 5G communication networks can support FR1 bands and / or FR2 bands. 5G communication networks can support various communication services and scenarios compared to LTE communication networks. For example, usage scenarios of 5G communication networks can include enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared to 5G, 6G communication networks can support a wider range of communication services and scenarios. 6G communication networks can meet requirements for ultra-high performance, ultra-high bandwidth, ultra-high space, ultra-high precision, ultra-intelligence, and / or ultra-reliability. 6G communication networks can support diverse and wide frequency bands and be applied to various usage scenarios (e.g., terrestrial communications, non-terrestrial communications, sidelink communications, etc.).

[0004] Meanwhile, in 5G NR, multiple-transmission / reception point (M-TRP) technology refers to a technique in which a base station (e.g., gNB) communicates with terminals by utilizing multiple transmission reception points (TRPs) that are physically separated. M-TRP technology can solve the problem of reduced quality-of-service (QoS) when terminals located at the cell-edge are far from the base station, and the problem of inter-cell interference from base stations located in different cells. In addition, MTPR technology can play a role in providing an additional communication path, which is a non-line-of-sight (NLOS) path, from the base station in cases where the line-of-sight (NLOS) path from the base station is limited, such as in the millimeter wave band.

[0005] Beam management for TRP in 5G NR can be defined as a set of L1 / L2 procedures that find or maintain the optimal beam required for transmission / reception of each TRP and UE. In particular, for beam management related to analog beamforming, a transmission configuration index (TCI) has been introduced to configure the UE's reception beam for a specific channel / signal, such as PDSCH / CSI-RS / PDCCH. TCI was introduced to dynamically indicate quasi-colocation (QCL) information through downlink control information (DCI) at the base station.

[0006] On the other hand, depending on the status and circumstances of the communication channel, it is necessary to switch between the uplink signal transmission method, Single Transmission and Reception Point (sTRP) mode and Multiple Transmission and Reception Point mode. However, the method and related procedures for switching between Single Transmission and Reception Point mode and Multiple Transmission and Reception Point mode are not defined. Therefore, a method for switching between Single Transmission and Reception Point mode and Multiple Transmission and Reception Point mode is required.

[0007] Meanwhile, the technology that serves as the background for the invention is written to promote understanding of the background for the invention, and may include content that is not a prior art already known to a person with ordinary skill in the field to which the technology belongs.

[0008] The present disclosure may provide a method and device for effectively transmitting a power headroom report (PHR) for a multiple-transmit / receive point (M-TRP) environment in a wireless communication system.

[0009] The present disclosure can provide a method and device for transmitting a PHR by considering the maximum power per panel in a wireless communication system.

[0010] The present disclosure may provide a method and device for setting a value of a maximum power field within a PHR in a wireless communication system.

[0011] The present disclosure may provide a method and apparatus for indicating properties of maximum power applied to a PHR in a wireless communication system.

[0012] The present disclosure may provide a method and device for indicating a ratio of the maximum power of a panel to the maximum power of a terminal in a wireless communication system.

[0013] The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical tasks not mentioned can be considered by a person having ordinary skill in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure described below.

[0014] As an example of the present disclosure, a method of operating a terminal in a wireless communication system may include a step of establishing connections to a plurality of TRPs, a step of receiving configuration information including information instructing to report a plurality of power headroom reports (PHRs) for the plurality of TRPs, a step of generating a plurality of PHRs based on a plurality of transmission configuration indicators (TCIs) associated with the plurality of TRPs, and a step of transmitting the plurality of PHRs through at least one of uplink channels of the plurality of TRPs.

[0015] As an example of the present disclosure, a method of operating a base station in a wireless communication system may include a step of establishing connections between a terminal and a plurality of TRPs, a step of transmitting configuration information including information instructing to report a plurality of PHRs (power headroom reports) for the plurality of TRPs, and a step of receiving a plurality of PHRs generated based on a plurality of transmission configuration indicators (TCIs) linked to the plurality of TRPs through at least one of uplink channels of the plurality of TRPs.

[0016] As an example of the present disclosure, in a wireless communication system, a terminal may include at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the terminal to perform operations, wherein the operations may include establishing connections to a plurality of Transmission Relay Points (TRPs), receiving configuration information including information instructing to report a plurality of power headroom reports (PHRs) for the plurality of TRPs, generating a plurality of PHRs based on a plurality of transmission configuration indicators (TCIs) associated with the plurality of TRPs, and transmitting the plurality of PHRs via at least one of uplink channels of the plurality of TRPs.

[0017] As an example of the present disclosure, a base station operating in a wireless communication system may include at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the base station to perform operations, wherein the operations may include establishing connections between a terminal and a plurality of Transmission Relay Points (TRPs), transmitting configuration information including information instructing the plurality of TRPs to report a plurality of power headroom reports (PHRs), and receiving a plurality of PHRs generated based on a plurality of transmission configuration indicators (TCIs) associated with the plurality of TRPs through at least one of uplink channels of the plurality of TRPs.

[0018] The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present disclosure to be described below.

[0019] The following effects may be achieved by embodiments based on the present disclosure.

[0020] According to the present disclosure, it is possible to effectively transmit power headroom reports for a multiple-transmit / receive point (M-TRP) environment.

[0021] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects that result from implementing the configuration described in the present disclosure can also be derived by those skilled in the art from the embodiments of the present disclosure.

[0022] The accompanying drawings are intended to aid in understanding the present disclosure and, together with detailed descriptions, may provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. Reference numerals in each drawing may indicate structural elements.

[0023] Figure 1 is a conceptual diagram illustrating an embodiment of a communication system.

[0024] Figure 2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.

[0025] Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.

[0026] Figure 4a is a block diagram illustrating an embodiment of a transmission path.

[0027] Figure 4b is a block diagram illustrating an embodiment of a receiving path.

[0028] Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.

[0029] Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.

[0030] Figure 7 is a conceptual diagram illustrating an embodiment of a slot in a communication system.

[0031] Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.

[0032] Figures 9a to 10c illustrate examples of formats of MAC (media access control)-CE (control elements) for PHR (power headroom) reporting.

[0033] FIG. 11 illustrates an example of a procedure for a PHR according to one embodiment of the present disclosure.

[0034] FIG. 12 illustrates an example of a procedure for transmitting PHRs per panel according to one embodiment of the present disclosure.

[0035] FIG. 13 illustrates an example of a procedure for transmitting a PHR based on a triggering condition according to one embodiment of the present disclosure.

[0036] This disclosure may be subject to various modifications and various embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the disclosure to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the disclosure.

[0037] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" may refer to a combination of multiple related items described herein or to any of multiple related items described herein.

[0038] In the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Additionally, in the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.”

[0039] In the present disclosure, (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission,” (re)setting may mean “setting,” “resetting,” or “setting and resetting,” (re)connection may mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection.”

[0040] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0041] The terminology used in this disclosure is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0042] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0043] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding in describing the present disclosure, the same reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted. In addition to the embodiments explicitly described in the present disclosure, operations may be performed according to combinations of embodiments, extensions of embodiments, and / or modifications of embodiments. The performance of some operations may be omitted, and the order of operation may be changed.

[0044] In an embodiment, even if a method (e.g., transmitting or receiving a signal) performed by a first communication node among communication nodes is described, a corresponding second communication node can perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed by the first communication node. That is, if an operation of a UE (user equipment) is described, a corresponding base station can perform an operation corresponding to the operation of the UE. Conversely, if an operation of a base station is described, a corresponding UE can perform an operation corresponding to the operation of the base station.

[0045] A base station may be referred to as a NodeB, an evolved NodeB, a gNodeB (next generation node B), a gNB, a device, an apparatus, a node, a communication node, a BTS (base transceiver station), a RRH (radio remote head), a TRP (transmission reception point), a RU (radio unit), an RSU (road side unit), a radio transceiver, an access point, an access node, etc. A UE may be referred to as a terminal, a device, an apparatus, a node, a communication node, an end node, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, an OBU (on-broad unit), etc.

[0046] In the present disclosure, signaling may be at least one of upper layer signaling, MAC signaling, or PHY (physical) signaling. A message used for upper layer signaling may be referred to as an "upper layer message" or an "upper layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Upper layer signaling may refer to a transmission and reception operation of system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to a transmission and reception operation of a MAC control element (CE). PHY signaling may refer to a transmission and reception operation of control information (e.g., downlink control information (DCI), uplink control information (UCI), sidelink control information (SCI)).

[0047] In the present disclosure, “an operation (e.g., a transmission operation) is set” may mean that “setting information for the operation (e.g., an information element, a parameter)” and / or “information instructing the performance of the operation” is signaled. “An information element (e.g., a parameter) is set” may mean that the information element is signaled. In the present disclosure, “a signal and / or a channel” may mean a signal, a channel, or “a signal and a channel,” and a signal may be used to mean “a signal and / or a channel.”

[0048] The communication network to which the embodiment is applied is not limited to what is described below, and the embodiment may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the communication network may be used in the same sense as the communication system.

[0049] Figure 1 is a conceptual diagram illustrating an embodiment of a communication system.

[0050] Referring to FIG. 1, the communication system (100) may include a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). In addition, the communication system (100) may further include a core network (e.g., a serving-gateway (S-GW), a packet data network (PDN)-gateway (P-GW), a mobility management entity (MME)). If the communication system (100) is a 5G communication system (e.g., a new radio (NR) system), the core network may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0051] A plurality of communication nodes (110 to 130) can support a communication protocol (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.) specified in the 3GPP (3rd generation partnership project) standard. The plurality of communication nodes (110 to 130) may support CDMA (code division multiple access) technology, WCDMA (wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (non-orthogonal multiple access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (space division multiple access) technology, etc. Each of the plurality of communication nodes may have the following structure.

[0052] Figure 2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.

[0053] FIG. 2 is a diagram illustrating an example of a wireless device (200) in a wireless communication system according to one embodiment of the present disclosure. The wireless device (200) according to the embodiment of the present disclosure may be a mobile terminal such as a smartphone, tablet PC, or wearable device, but is not limited thereto.

[0054] Referring to FIG. 2, the wireless device (200) may include at least one control unit (210), at least one memory (220), at least one power supply unit (230), at least one transceiver unit (240), at least one input unit (250), at least one output unit (260), and / or at least one antenna (270).

[0055] The control unit (210) can control the memory (220) and / or the transceiver unit (240), and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. The memory (220) can be connected to the control unit (210) and can store various information related to the operation of the control unit (210). For example, the memory (220) can perform some or all of the controls controlled by the control unit (210), or store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. The configuration of the memory is not limited in a specific manner. For example, it can be configured as at least one of a read-only memory (ROM) and a random access memory (RAM).

[0056] At least one control unit (210) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of codes, instructions, and / or a set of instructions. Here, the firmware or software may execute another program stored in a memory (220), such as an OS. The control unit (210) may be implemented to support beamforming or directional routing operations in which signals from at least one antenna (270) are differently weighted to effectively steer signals outgoing in a desired direction.

[0057] Additionally, at least one control unit (210) may be coupled to a backhaul or network interface. The wireless device (200) may communicate with other wireless devices through the backhaul or network interface. The control unit (210) may include at least one processor. The processor may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present disclosure are performed.

[0058] At least one transceiver (240) may be connected to the control unit (210) and may transmit and / or receive a wireless signal via at least one antenna (270). The transceiver (240) may include a transmitter and / or a receiver. The at least one transceiver (240) may transmit user data, control information, wireless signals / channels, etc. mentioned in the methods and / or operation flowcharts of the present disclosure to at least one other device. For example, the at least one transceiver (240) may be connected to at least one control unit (210) and may transmit and receive wireless signals. In addition, the at least one control unit (210) may control the at least one transceiver (240) to transmit user data, control information, or a wireless signal to at least one other device. The at least one transmitter (240) may receive a signal transmitted by another wireless device from at least one antenna (270). Additionally, at least one transceiver (24) may downconvert or upconvert the received signal to generate a baseband signal. At least one antenna (270) may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0059] The input unit (250) can obtain information such as user input, video, and audio, and can include various input means such as various mechanical / electronic input means, cameras, and microphones. The output unit (260) is for providing information to users by generating output related to sight, hearing, or touch, and can include a display, a speaker, a vibration module, and the like. The wireless device (200) supplies power through the power supply unit (230), and the power supply unit (230) can include a wired / wireless charging circuit, a battery, and the like.

[0060] Referring again to FIG. 1, the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) may form a macro cell. Each of the fourth base station (120-1) and the fifth base station (120-2) may form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) may be within the cell coverage of the first base station (110-1). The second terminal (130-2), the fourth terminal (130-4), and the fifth terminal (130-5) may be within the cell coverage of the second base station (110-2). The fifth base station (120-2), the fourth terminal (130-4), the fifth terminal (130-5), and the sixth terminal (130-6) may be within the cell coverage of the third base station (110-3). The first terminal (130-1) may be within the cell coverage of the fourth base station (120-1). The sixth terminal (130-6) may be within the cell coverage of the fifth base station (120-2).

[0061] Here, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as a NodeB (NB), an evolved NodeB (eNB), a gNB, an advanced base station (ABS), a high reliability-base station (HR-BS), a base transceiver station (BTS), a radio base station, a radio transceiver, an access point, an access node, a radio access station (RAS), a mobile multihop relay-base station (MMR-BS), a relay station (RS), an advanced relay station (ARS), a high reliability-relay station (HR-RS), a home NodeB (HNB), a home eNodeB (HeNB), a road side unit (RSU), a radio remote head (RRH), a transmission point (TP), a transmission and reception point (TRP), etc.

[0062] Each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as a user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), high reliability-mobile station (HR-MS), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, on board unit (OBU), etc.

[0063] Meanwhile, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may operate in a different frequency band or may operate in the same frequency band. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to each other via an ideal backhaul link or a non-ideal backhaul link, and may exchange information with each other via the ideal backhaul link or the non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to the core network via the ideal backhaul link or the non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.

[0064] Additionally, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may support MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, sidelink communication (e.g., device to device communication (D2D), proximity services (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc. Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2). For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO scheme, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) by the SU-MIMO scheme. Alternatively, the second base station (110-2) can transmit signals to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive signals from the second base station (110-2) based on the MU-MIMO method.

[0065] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP scheme, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) based on the CoMP scheme. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive a signal with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage based on the CA scheme. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control sidelink communication between the fourth terminal (130-4) and the fifth terminal (130-5), and each of the fourth terminal (130-4) and the fifth terminal (130-5) can perform sidelink communication under the control of the second base station (110-2) and the third base station (110-3), respectively.

[0066] Meanwhile, communication nodes performing communication in a communication network may be configured as follows. The communication node illustrated in FIG. 3 may be a specific embodiment of the wireless device illustrated in FIG. 2.

[0067] Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.

[0068] Referring to FIG. 3, each of the first communication node (300a) and the second communication node (300b) may be a base station or a UE. The first communication node (300a) may transmit a signal to the second communication node (300b). The transmission processor (311) included in the first communication node (300a) may receive data (e.g., a data unit) from a data source (310). The transmission processor (311) may receive control information from the controller (316). The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0069] The transmitting processor (311) may perform a processing operation on data (e.g., an encoding operation, a symbol mapping operation, etc.) to generate data symbol(s). The transmitting processor (311) may perform a processing operation on control information (e.g., an encoding operation, a symbol mapping operation, etc.) to generate control symbol(s). In addition, the transmitting processor (311) may generate synchronization / reference symbol(s) for a synchronization signal and / or a reference signal.

[0070] The Tx MIMO processor (312) may perform a spatial processing operation (e.g., a precoding operation) on data symbol(s), control symbol(s), and / or synchronization / reference symbol(s). The output (e.g., a symbol stream) of the Tx MIMO processor (312) may be provided to modulators (MODs) included in the transceivers (313a to 313t). The modulators (MODs) may perform a processing operation on the symbol stream to generate modulation symbols, and may perform an additional processing operation (e.g., an analog conversion operation, an amplification operation, a filtering operation, an upconversion operation) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (313a to 313t) may be transmitted via the antennas (314a to 314t).

[0071] Signals transmitted by the first communication node (300a) may be received by antennas (364a to 364r) of the second communication node (300b). Signals received by the antennas (364a to 364r) may be provided to demodulators (DEMODs) included in transceivers (363a to 363r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (362) may perform a MIMO detection operation on the symbols. The receiving processor (361) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (361) may be provided to a data sink (360) and a controller (366). For example, data may be provided to the data sink (360), and control information may be provided to the controller (366).

[0072] Meanwhile, the second communication node (300b) can transmit a signal to the first communication node (300a). The transmitting processor (368) included in the second communication node (300b) can receive data (e.g., data units) from a data source (367) and perform a processing operation on the data to generate data symbol(s). The transmitting processor (368) can receive control information from the controller (366) and perform a processing operation on the control information to generate control symbol(s). In addition, the transmitting processor (368) can perform a processing operation on a reference signal to generate reference symbol(s).

[0073] The Tx MIMO processor (369) may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or reference symbol(s). The output (e.g., symbol stream) of the Tx MIMO processor (369) may be provided to modulators (MODs) included in the transceivers (363a to 363t). The modulators (MODs) may perform processing operations on the symbol streams to generate modulation symbols, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (363a to 363t) may be transmitted via the antennas (364a to 364t).

[0074] Signals transmitted by the second communication node (300b) may be received by the antennas (314a to 314r) of the first communication node (300a). The signals received by the antennas (314a to 314r) may be provided to demodulators (DEMODs) included in the transceivers (313a to 313r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (320) may perform a MIMO detection operation on the symbols. The receiving processor (319) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (319) may be provided to a data sink (318) and a controller (316). For example, data may be provided to the data sink (318) and control information may be provided to the controller (316).

[0075] Memories (315 and 365) can store data, control information, and / or program code. Scheduler (317) can perform scheduling operations for communication. The processors (311, 312, 319, 361, 368, 369) and controllers (316, 366) illustrated in FIG. 3 may be the processor (210) illustrated in FIG. 2 and may be used to perform the methods described in the present disclosure.

[0076] Fig. 4a is a block diagram illustrating an embodiment of a transmission path, and Fig. 4b is a block diagram illustrating an embodiment of a reception path.

[0077] Referring to FIGS. 4A and 4B, a transmission path (410) may be implemented in a communication node that transmits a signal, and a reception path (420) may be implemented in a communication node that receives a signal. The transmission path (410) may include a channel coding and modulation block (411), an S-to-P (serial-to-parallel) block (512), an N IFFT (Inverse Fast Fourier Transform) block (413), a P-to-S (parallel-to-serial) block (414), a CP (cyclic prefix) addition block (415), and an UC (up-converter) (UC) (416). The receiving path (420) may include a DC (down-converter) (421), a CP removal block (422), an S-to-P block (423), an N FFT block (424), a P-to-S block (425), and a channel decoding and demodulation block (426). Here, N may be a natural number.

[0078] In the transmission path (410), information bits may be input to a channel coding and modulation block (411). The channel coding and modulation block (411) may perform a coding operation (e.g., a low-density parity check (LDPC) coding operation, a polar coding operation, etc.) and a modulation operation (e.g., a quadrature phase shift keying (QPSK), a quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block (411) may be a sequence of modulation symbols.

[0079] The S-to-P block (412) can convert modulation symbols in the frequency domain into parallel symbol streams to generate N parallel symbol streams. N can be an IFFT size or an FFT size. The N IFFT block (413) can perform an IFFT operation on the N parallel symbol streams to generate signals in the time domain. The P-to-S block (414) can convert the output (e.g., parallel signals) of the N IFFT block (413) into a serial signal to generate a serial signal.

[0080] The CP addition block (415) can insert a CP into a signal. The UC (416) can up-convert the frequency of the output of the CP addition block (415) to an RF (radio frequency) frequency. Additionally, the output of the CP addition block (415) can be filtered at the baseband before up-conversion.

[0081] A signal transmitted from a transmission path (410) may be input to a reception path (420). An operation in the reception path (420) may be the reverse operation of the operation in the transmission path (410). A DC (421) may down-convert the frequency of the received signal to a baseband frequency. A CP removal block (422) may remove a CP from a signal. The output of the CP removal block (422) may be a serial signal. An S-to-P block (423) may convert the serial signal into parallel signals. An N FFT block (424) may perform an FFT algorithm to generate N parallel signals. A P-to-S block (425) may convert the parallel signals into a sequence of modulation symbols. A channel decoding and demodulation block (426) may perform a demodulation operation on the modulation symbols and perform a decoding operation on the result of the demodulation operation to restore data.

[0082] In FIGS. 4A and 4B , Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT. Each of the blocks (e.g., components) in FIGS. 4A and 4B may be implemented by at least one of hardware, software, or firmware. For example, some of the blocks in FIGS. 4A and 4B may be implemented by software, and the remaining blocks may be implemented by hardware or a “combination of hardware and software.” In FIGS. 4A and 4B , a block may be subdivided into multiple blocks, multiple blocks may be integrated into a single block, some blocks may be omitted, and blocks supporting other functions may be added.

[0083] Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.

[0084] Referring to FIG. 5, time resources in a communication system can be divided into frame units. For example, system frames can be set consecutively in the time domain of the communication system. The length of a system frame can be 10 ms (milliseconds). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0085] A system frame may include two half frames. A half frame may be 5 ms long. A half frame located at the beginning of the system frame may be referred to as "half frame #0," and a half frame located at the end of the system frame may be referred to as "half frame #1." A system frame may include 10 subframes. A subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as "subframes #0-9."

[0086] Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.

[0087] Referring to FIG. 6, one subframe may include n slots, where n may be a natural number. Accordingly, one subframe may be composed of one or more slots.

[0088] Figure 7 is a conceptual diagram illustrating an embodiment of a slot in a communication system.

[0089] Referring to Figure 7, a single slot may include one or more symbols. A single slot illustrated in Figure 7 may include 14 symbols. The length of a slot may vary depending on the number and length of symbols contained in the slot. Alternatively, the length of a slot may vary depending on the numerology.

[0090] In a communication system, the numerology applied to physical signals and channels may be variable. The numerology may be variable to meet various technical requirements of the communication system. In a communication system applying CP (cyclic prefix)-based OFDM waveform technology, the numerology may include subcarrier spacing and CP length (or CP type). Table 1 may be an embodiment of a method for configuring a numerology for a CP-OFDM-based communication system. At least some of the numerologies in Table 1 may be supported depending on the frequency band in which the communication system operates. In addition, the communication system may additionally support numerologies not listed in [Table 1].

[0091] Subcarrier spacing 15 ㎑ 30 ㎑ 60 ㎑ 120 ㎑ 240 ㎑ 480 ㎑ OFDM symbol length [㎲] 66.733.316.78.34.22.1 CP length [㎲] 4.762.381.190.600.300.151 Number of OFDM symbols in ㎳ 142856112224448

[0092] When the subcarrier spacing is 15 kHz (e.g., μ=0), the slot length can be 1 ms. In this case, one system frame can contain 10 slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the slot length can be 0.5 ms. In this case, one system frame can contain 20 slots. When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, one system frame can contain 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, one system frame can contain 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, one system frame can contain 160 slots.

[0093] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting solely of DL symbols may be referred to as a "DL slot," a slot consisting solely of FL symbols may be referred to as an "FL slot," and a slot consisting solely of UL symbols may be referred to as a "UL slot."

[0094] The slot format can be semi-statically configured by higher layer signaling (e.g., RRC signaling). Information indicating the semi-static slot format can be included in the system information, and the semi-static slot format can be configured cell-specifically. In addition, the semi-static slot format can be additionally configured for each terminal through terminal-specific higher layer signaling (e.g., RRC signaling). The flexible symbol of the cell-specifically configured slot format can be overridden to a downlink symbol or an uplink symbol by terminal-specific higher layer signaling. In addition, the slot format can be dynamically indicated by physical layer signaling (e.g., a slot format indicator (SFI) included in DCI). The semi-statically configured slot format can be overridden by a dynamically indicated slot format. For example, the semi-statically configured flexible symbol can be overridden to a downlink symbol or an uplink symbol by the SFI.

[0095] The reference signal may be a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), a phase tracking-reference signal (PT-RS), etc. The channel may be a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), etc. In the present disclosure, the control channel may mean a PDCCH, a PUCCH, or a PSCCH, and the data channel may mean a PDSCH, a PUSCH, or a PSSCH.

[0096] Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.

[0097] Referring to FIG. 8, a resource consisting of one symbol (e.g., an OFDM symbol) in the time domain and one subcarrier in the frequency domain may be defined as a "RE (resource element)". Resources consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain may be defined as a "REG (resource element group)". A REG may include K REs. A REG may be used as a basic unit for resource allocation in the frequency domain. K may be a natural number. For example, K may be 12. N may be a natural number. In the slot illustrated in FIG. 7, N may be 14. N OFDM symbols may be used as a basic unit for resource allocation in the time domain.

[0098] In the present disclosure, RB may mean CRB (common RB). Alternatively, RB may mean PRB or VRB (virtual RB). In a communication system, CRB may mean RB that constitutes a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). Carriers and / or bandwidth portions may be arranged on the common RB grid. That is, the carrier and / or bandwidth portions may be composed of CRB(s). RBs or CRBs that constitute the bandwidth portions may be referred to as PRBs, and within the bandwidth portions, the CRB index may be appropriately converted to the PRB index.

[0099] Downlink data can be transmitted via the PDSCH. The base station can transmit PDSCH configuration information (e.g., scheduling information) to the terminal via the PDCCH. The terminal can obtain the PDSCH configuration information by receiving the PDCCH (e.g., downlink control information (DCI)). For example, the PDSCH configuration information can include the MCS (modulation coding scheme) used for transmitting and receiving the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, feedback resource information for the PDSCH, etc. The PDSCH can refer to a radio resource through which downlink data is transmitted and received. Alternatively, the PDSCH can refer to the downlink data itself. The PDCCH can refer to a radio resource through which downlink control information (e.g., DCI) is transmitted and received. Alternatively, the PDCCH can refer to the downlink control information itself.

[0100] A terminal can perform a monitoring operation on the PDCCH to receive a PDSCH transmitted from a base station. The base station can inform the terminal of the configuration information for the PDCCH monitoring operation using a higher layer message (e.g., an RRC (radio resource control) message). The configuration information for the PDCCH monitoring operation can include CORESET (control resource set) information and search space information.

[0101] CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH opportunity information, etc. The PDCCH DMRS may be a DMRS used to demodulate the PDCCH. The PDCCH opportunity may be a region where the PDCCH can exist. In other words, the PDCCH opportunity may be a region where DCI can be transmitted. The PDCCH opportunity may be referred to as a PDCCH candidate. The PDCCH opportunity information may include time resource information and frequency resource information of the PDCCH opportunity. In the time domain, the length of the PDCCH opportunity may be indicated in symbol units. In the frequency domain, the size of the PDCCH opportunity may be indicated in RB units (e.g., in PRB (physical resource block) units or CRB (common resource block) units).

[0102] The search space information may include a coreset identifier (ID) associated with the search space, a period of PDCCH monitoring, and / or an offset. Each of the PDCCH monitoring period and offset may be indicated on a slot-by-slot basis. In addition, the search space information may further include an index of the symbol at which the PDCCH monitoring operation begins.

[0103] A base station can configure a bandwidth part (BWP) for downlink communication. The BWP can be configured differently for each terminal. The base station can inform the terminal of the BWP configuration information using higher layer signaling. The higher layer signaling can mean "transmission operation of system information" and / or "transmission operation of RRC (radio resource control) message." The number of BWPs configured for one terminal can be one or more. The terminal can receive BWP configuration information from the base station and check the BWP(s) configured by the base station based on the BWP configuration information. When multiple BWPs are configured for downlink communication, the base station can activate one or more BWPs among the multiple BWPs. The base station can transmit the configuration information of the activated BWP(s) to the terminal using at least one of higher layer signaling, a medium access control (MAC) control element (CE), or DCI. The base station can perform downlink communication using the activated BWP(s). The terminal can identify the activated BWP(s) by receiving configuration information of the activated BWP(s) from the base station, and perform a downlink reception operation in the activated BWP(s).

[0104] Meanwhile, in 5G NR, Multiple Transmission and Reception Point (M-TRP) technology refers to a technique in which a base station (e.g., gNB) communicates with a terminal by utilizing multiple Transmission Reception Points (TRPs) that are physically separated. By utilizing multiple TRPs, M-TRP technology can solve the problem of reduced Quality-of-Service (QoS) for terminals located at the cell-edge when they are far from the base station, while also resolving the problem of inter-cell interference from base stations located in different cells. In addition, MTPR technology can play a role in providing an additional communication path, which is a non-line-of-sight (NLOS) path, from the base station in cases where the line-of-sight (LOS) path from the base station is limited, such as in the millimeter wave band.

[0105] In the standard, M-TRP technology is divided into Coherent Joint Transmission (CJT) and Non-Coherent Joint Transmission (NCJT). The CJT method allows two or more TRPs to cooperate in a synchronized manner to support data transmission to a single terminal based on a stable backhaul link between the TRPs and the connected base stations. On the other hand, the NCJT method allows two or more TRPs to decide scheduling, precoding matrix selection, modulation, and coding schemes without cooperation between the TRPs in a situation where two or more TRPs support a single terminal.

[0106] Beam management for TRP in 5G NR can be defined as a set of L1 / L2 procedures that find or maintain the optimal beam required for transmission / reception at each TRP and terminal. Beam management procedures can be broadly categorized into four categories, as follows:

[0107] 1) Beam determination

[0108] 2) Beam measurement

[0109] 3) Beam reporting

[0110] 4) Beam sweeping

[0111] Here, the TRP and the UE can utilize the reciprocity characteristics of the downlink (DL) / uplink (UL) channels when managing beams. For example, the UE can utilize the values ​​measured in the receive beams (Rx beams) of the DL channel when configuring the transmit beam (Tx beam). And, the UE can utilize the values ​​measured in the transmit beams (Tx beams) of the UL channel when configuring the receive beam (Rx beam). These transmit beam configuration and receive beam configuration procedures can be performed in the same manner for the base station as for the UE. In particular, a transmission configuration indicator (TCI) has been introduced for beam management related to analog beamforming. The TCI can be used to configure a beam to be used for transmission of a specific channel and / or signal, for example, PDSCH and / or CSI-RS and / or PDCCH. The base station can dynamically indicate quasi-colocation (QCL) information to the UE by transmitting TCI through downlink control information (DCI).

[0112] 3GGP Rel-17 introduced a TCI configuration method utilizing a unified TCI pool, or the unified TCI framework, to reduce signaling overhead for QCL configuration of DL and / or UL channels and simplify multi-beam operation compared to the previous release of 3GGP Rel-16.

[0113] According to the unified TCI framework, the base station can preset a common TCI pool that can be commonly used (or applied) for DL ​​and UL channels via RRC signaling. Furthermore, according to the unified TCI framework, the base station can directly indicate TCI for DL ​​and UL channels from the configured common TCI pool using the Medium Access Control (MAC) control element (CE) (MAC-CE) / downlink control information (DCI). Furthermore, according to the unified TCI framework, the base station can support updates to the common TCI state.

[0114] A common TCI state can be indicated (or set) for multiple component carriers (CCs). Among the multiple CCs, a reference CC can be additionally set, and TCI updates for other CCs within the indicated list can be performed simultaneously via a TCI update command for the reference CC.

[0115] At this time, there are three main methods for setting the status of TCI for DL ​​channels and UL channels.

[0116] A. Joint TCI state indication method that is commonly indicated to DL / UL channels

[0117] B. DL channel separate TCI state indication method for setting TCI separately for DL ​​channel and

[0118] C. UL Channel Separate TCI State Indication Method

[0119] Looking at the three methods above from a broader perspective, they can be divided into a joint TCI status indication method that provides common indications for both DL and UL channels, and a separate TCI status indication method that sets TCIs separately for each DL or UL channel. The fundamental difference between the two methods above lies in the existence of reciprocity between the DL and UL channels.

[0120] The Unified TCI framework was designed for a single TRP (sTRP) in 3GPP Rel-17. However, 3GPP Rel-18 aims to expand to a multi-TRP (M-TRP) system.

[0121]

[0122] In the 5G NR standard, various use cases such as enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) have been discussed and decided upon in response to the demands for massive access, high efficiency, high reliability, and ultra-low latency. M-TRP is one of the techniques to address these issues and belongs to the category of MIMO technology. In the case of the M-TRP technique, data transmission to a single terminal is performed from multiple TRPs with characteristics at the macro / small / pico / femto cell level. The M-TRP technique can attenuate the impact of channel links with uneven channel conditions due to obstacles or interference, and can also increase the data transmission rate for terminals in the cell edge region. In Rel-15, the basic structure and related applications for M-TRP were discussed and defined, and in Rel-16 and Rel-17, enhancement techniques for the M-TRP were discussed and defined. Although the basic concept of M-TRP existed in LTE, the M-TRP-like concept in LTE was not suitable for newly defined deployments such as the assumption of ideal backhaul and use cases targeted in 5G. Therefore, the discussion and definition of the actual M-TRP technique can be seen to have started in Rel-15 NR.

[0123] Methods that support M-TRP can be broadly categorized into two: coherent joint transmission (CJT) and non-coherent joint transmission (NCJT). In the case of CJT, the base station must know the channel information between each TRP and the terminal and pre-process the data transmitted through each TRP, which increases the overhead of channel information transmission and has limitations such as synchronization between TRPs. On the other hand, in the case of NCJT, there is no need to know the channel information between the terminal required for transmission and all TRPs, and data is transmitted to the terminal from multiple TRPs without pre-processing such as phase compensation. Therefore, the standard has been interested in NCJT due to its low complexity, and it was introduced starting from Rel-16. NCJT-based transmission can be broadly divided into two methods: single DCI-based transmission and multiple DCI-based transmission. In the case of single DCI-based transmission, it is a method of scheduling PDSCHs transmitted from multiple TRPs through a single DCI, and in the case of multi-DCI-based transmission, it is a method in which each TRP schedules the PDSCHs transmitted from each TRP through DCI, that is, it is a method of scheduling multiple PDSCHs using multiple DCIs. In the case of single DCI-based transmission, a terminal can expect to receive PDSCHs transmitted from different TRPs through resources of the same time / frequency and different layers. Alternatively, the terminal can expect to receive PDSCHs from different TRPs through the same frequency / layer and different time domains, or the same time / layer and different frequency domains.For multi-DCI-based transmission, PDSCH scheduling for each TRP is performed through individual DCIs, and the PDSCHs scheduled through multiple DCIs may be fully overlapped, partially overlapped, or non-overlapped. For both single-DCI-based transmission and multi-DCI-based transmission, the DCI field includes TCI (Transmission configuration indicator) status information for the PDSCH.

[0124] The TCI state is one of the core techniques required for the M-TRP technique. This is because, unlike LTE, the use of high-frequency bands such as FR2 allows for clustered antenna installation, making beam setting, which requires high adaptability and low latency, important. The TCI state indication / setting to the terminal can be interpreted as transmit / receive beam setting, and can mean QCL setting from a downlink perspective and spatial filter setting from an uplink perspective. The unified TCI state is a technique that can indicate / set a common beam regardless of uplink and downlink, or set a common beam for both downlink and uplink.

[0125] In Rel-17, enhancements were implemented to improve reliability and robustness of M-TRP, and PDCCH enhancement is one of them. The deployment scenarios for this PDCCH enhancement can be broadly divided into single-frequency network (SFN) and non-SFN scenarios.

[0126] In the case of SFN deployment, the same PDCCH is transmitted across different TRPs or panels utilizing the same time and frequency resources. That is, the same PDCCHs transmitted across all TRPs use the same DMRS configuration, position, and sequence. At this time, the TCI configuration from the receiver perspective can be implicitly set differently for each TRP or panel, but explicit instructions / configurations are not supported from the standard perspective. SFN can be achieved through multiple TCI states of CORESET and is subject to synchronization constraints such as ideal or near-ideal backhaul between TRPs.

[0127] Non-SFN techniques can be broadly divided into two types: one in which fully generated PDCCHs from each TRP are multiplexed in time and / or frequency axes (e.g., M-TRP-based PDCCH repetition); and one in which bits equal to the number of encoded bits transmitted on a single PDCCH are split per TRP and transmitted through different PDCCH candidates (e.g., sTRP-based PDCCH transmission). In the former case, PDCCHs are repeatedly generated as many times as the number of TRPs, and PDCCHs are transmitted from the same search space index within different search space sets having the same number of PDCCH candidates. In this case, the search space sets may exist within the same CORESET or within different CORESETs. According to the standard, only one TCI state can be associated with a CORESET. Therefore, if PDCCHs are transmitted in different search spaces within the same CORESET, only one TCI state can be indicated / configured for both PDCCHs, and the UE can receive a signal from only one TRP at a time. On the other hand, if PDCCHs are transmitted in the same search space index within different CORESETs, the UE can implicitly expect reception from a single TRP or reception from multiple TRPs, depending on the number of indicated / configured TCI state(s). The latter method divides a single PDCCH into the number of TRPs and transmits the PDCCHs on different PDCCH candidates. In other words, the aggregation level and the combined aggregation level are the same.In this method, PDCCH candidates can also be assigned to different CORESETs, and since the payload after the distributed PDCCHs are finally combined is the same as the payload of the PDCCH transmitted in a single TRP, it has an advantage over the former iterative method in terms of decoding complexity.

[0128] The unified TCI state framework introduced in Rel-17 transmits a pool (e.g., a list) of TCI states from the base station to the terminal via RRC configuration. At this time, type information for the TCI state can be configured together, and the types can be broadly divided into 'separate' and 'joint'. 'Separate' means that separate TCI state configurations are performed for downlink and uplink by distinguishing between downlink and uplink, and 'joint' means that TCI state configurations are performed without distinguishing between downlink and uplink. When configured as the 'joint' type, the terminal is expected to utilize the resources for TCI states provided together with the PDSCH configuration for both downlink and uplink channels. Conversely, when set to 'separate' type, the terminal is expected to separately use the uplink TCI states provided together with the uplink BWP (bandwidth part) configuration for uplink channels (e.g., PUSCH, PUCCH, SRS, etc.).

[0129] After setting the pool (e.g., list) of TCI states through RRC signaling at the base station, DCI is utilized to apply / indicate the actual TCI states. At this time, due to the bit resource constraints of the DCI field, the base station preferentially activates several candidate TCI states through MAC-CE. That is, the base station preferentially activates as many candidate TCI states as the maximum number that can be set by DCI using MAC-CE. DCI conveys a codepoint corresponding to a single TCI state (e.g., a TCI state for the 'combined' type) or two TCI states (e.g., TCI states for the 'separate' type) for each of the activated candidate TCI states, depending on the type of the TCI state. Since the current standard considers up to two TRPs, it is possible for the base station to instruct / configure up to four TCI states (e.g., in the case of the 'separate' type) to the terminal. The current standard discusses extending the unified TCI framework within a single TRP to multiple TRPs. Specifically, discussions are underway regarding the detailed operation of terminals and base stations and related signaling in S-DCI and / or M-DCI-based systems, respectively. RAN1 addresses the scalability of the unified TCI framework within the M-TRP to all downlink channels and each uplink channel that can be used in the RRC connected state.

[0130] In Rel-18, individual data transmission through multiple panels of a terminal is enabled, and the base station can obtain the information necessary for data transmission for each panel from the terminal. One of the items of information obtained may include a report on power headroom (PH). Power headroom indicates the remaining power of the terminal in addition to the power currently being used for data transmission in a subframe unit, and the transmission power for the corresponding data is an estimated value, not the value actually used for transmission. The power actually used for data transmission cannot exceed the maximum transmission power supported by the terminal, but the estimated data transmission power can exceed the maximum transmission power supported by the terminal. Therefore, the reported power headroom can have both positive and negative values. Typically, the report on power headroom is transmitted from the terminal to the base station through the MAC layer, which is a layer above the physical layer, and the reported value / index is mapped to one of the power intervals according to a table defined in the standard. For example, if PH is reported as '0', the actual power headroom can have values ​​greater than -23 dB and less than -22, and the number of bits transmitted through MAC-CE can also vary depending on the number of these indices.

[0131] Regarding the conditions for triggering transmission of a power headroom report (PHR), triggering may occur according to various conditions, such as transmitting a PHR periodically, transmitting a PHR when a specific condition is met, or transmitting a PHR when a secondary cell other than a serving cell is activated. Here, an example of a specific condition may include a case where the value of path loss, which is closely related to the transmission power setting, is greater than the amount of change of a specific threshold value. As described above, transmission of a PHR may be triggered by various set conditions. In this case, the PHR may be transmitted from the terminal to the NW (e.g., gNB, eNG, TRP, etc.) via the MAC-CE. The PHR is transmitted via the MAC-CE, and in the present disclosure, the MAC-CE for transmitting the PHR is referred to as a 'PHR MAC-CE'.

[0132] Fig. 9a is a single entry PHR MAC-CE, and Figs. 9b and 9c are multiple entry PHR MAC-CEs. Fig. 9a illustrates an example of a format for transmitting one PH (power headroom) for one cell. PH is an indicator of how much power headroom a terminal has, and can be calculated by subtracting the power to be used for uplink transmission from the maximum transmittable power of the terminal. Fig. 9b illustrates an example of a format for transmitting one PH for each cell for seven or fewer cells. Fig. 3 illustrates an example of a format for transmitting one PH for each cell for eight or more cells.

[0133] In FIGS. 9a, 9b, and 9c, PH is a field indicating a calculated PH using 6 bits, R is a reserved bit, and V is a field indicating whether the uplink transmission considers real transmission or a reference format. In the PH field, the type can be set to one of Type 1, Type 2, or Type 3, and Type 1 PH is for cases where uplink transmission of PUSCH is applied when calculating PH, Type 2 PH is for cases where uplink transmission of PUCCH and PUSCH is applied when calculating PH, and Type 3 PH is for cases where uplink transmission of SRS is considered when calculating PH.

[0134] P and MPE (Maximum Permissible Exposure) are fields that indicate whether the requirements for MPE are satisfied and power back-off, etc. At this time, if mpe-Reporting-FR2 is not set, or the serving cell operates in FR1, or the P field is set to 0, the 2-bit MPE field is set to reserved bits. Pcmax means the maximum transmittable power of the terminal used for PH calculation. In FIGS. 2 and 3, C is a field that indicates the activation / deactivation status for each cell.

[0135] Fig. 10a illustrates an example of an enhanced single entry PHR MAC-CE format. Figs. 10b and 10c illustrate an example and another example of an enhanced multiple entry PHR MAC-CE format. Compared to Figs. 9a, 9b, and 9c, the biggest difference in the structure of Figs. 10a, 10b, and 10c is that it has a structure capable of reporting two PHs for one cell. Therefore, in case of M-TRP (multiple-transmit / receive point) operation, the terminal can calculate PHs for two TRPs belonging to one cell and report the PHs simultaneously. Alternatively, the terminal can simultaneously transmit using the PHR MAC-CE of Figs. 9b, 9c, 10b, and 10c for each TRP belonging to different cells.

[0136] For example, if multiplePHR is set by RRC, the terminal can operate to report PH for one or more cells using MAC-CE as shown in FIGS. 9b, 9c, 10b, and 10c. As another example, if twoPHRmode is set by RRC, the terminal can operate to report two PHs for one cell using MAC-CE as shown in FIGS. 10a, 10b, and 10c.

[0137] Meanwhile, by setting specific parameters such as multipanelScheme through RRC, it is possible to set up STxMP (simultaneous transmission across multi-panel) transmission for a terminal (hereinafter referred to as "STxMP setting"). STxMP is a technique by which a terminal simultaneously transmits and / or receives signals using multiple panels. Depending on the STxMP setting, the terminal can perform M-TRP communication.

[0138] The present disclosure proposes various operation methods using the PHR MAC-CEs illustrated in FIGS. 9A to 10C in an M-TRP communication environment. For convenience of explanation, the M-TRP for two TRPs is described as the basis, and the proposed method can be applied in an environment where communication is performed with three or more TRPs in a simple, modified, extended, or combined form. In addition, for convenience of explanation, the present disclosure refers to the maximum power that a terminal can use for transmission as Pcmax per UE (Pcmax per UE), and the maximum power that a terminal can use for transmission for each of its multiple panels is referred to as Pcmax per panel (Pcmax per panel). In addition, the maximum power indicated in the PHR MAC-CE is referred to as Pcmax in field (Pcmax in field). That is, the Pcmax in the field indicated in the PHR MAC-CE can be set to the Pcmax per UE, the Pcmax per panel, or a maximum power value set in another form. At this time, the value of Pcmax per UE or the value of Pcmax per panel can be interpreted as the maximum transmittable power that takes into account the maximum transmittable power that can be implemented or physically output in addition to the amount of power currently available. For example, if the value of the maximum transmittable power that can be physically / implementably output to the corresponding panel is smaller than the maximum transmittable power value per panel available to the terminal, the Pcmax per panel can be set to the value of the maximum transmittable power that can be physically / implementably output to the corresponding panel. The opposite also applies. The concept of setting the maximum transmittable power value described above can also be applied to setting the Pcmax per UE. In addition, the present disclosure refers to the maximum power value used in calculating PH as Pcmax for calculating PH (Pcmax calculating PH).

[0139]

[0140] FIG. 11 illustrates an example of a procedure for a PHR according to one embodiment of the present disclosure.

[0141] Referring to FIG. 11, in step S1101, the terminal (1110) and the base station (1120) perform access and connection establishment procedures for at least one TRP. That is, the base station (1120) includes at least one TRP, and the terminal (1110) can perform a random access procedure, a connection establishment procedure, etc. for at least one TRP. Accordingly, the terminal (1110) can transmit and / or receive signals with at least one TRP.

[0142] In step S1103, the base station (1120) transmits configuration information for the PHR. The configuration information for the PHR includes at least one parameter required for generating and transmitting the PHR. Specifically, the at least one parameter required for generating and transmitting the PHR may include information on at least one of a request for the PHR, a transmission time of the PHR, a structure of the PHR, the number of PHRs per cell, or a calculation method of the PHR. Accordingly, the terminal (1110) may configure at least one parameter for calculating the PHR.

[0143] In step S1105, the base station (1120) transmits configuration information for M-TRP. The configuration information for M-TRP may include at least one of a configuration related to CORESET, a configuration related to a multiplexing method, a configuration related to repeated transmission, and a configuration related to QCL (quasi-colocated) of a channel (e.g., a TCI state). That is, the base station (1120) transmits to the terminal (1110) the configuration information necessary for performing communication based on M-TRP. For example, the terminal (1110) may receive, for M-TRP operation, a configuration for one or more CORESETs for multiple TRPs, a configuration for TCI states associated with the multiple TRPs, and a configuration for a transmission mode (e.g., TDM, FDM, SFN, SDM, etc.). Here, according to another embodiment, this step is omitted, and the base station (1120) may transmit configuration information for performing communication based on S-TRP.

[0144] In step S1107, the terminal (1110) generates at least one PHR. That is, the terminal (1110) generates at least one PHR to report the spare transmission power of the terminal (1110) by considering the previously received configuration information. At this time, the terminal (1110) has multiple panels and, depending on the configuration or situation of the base station (1120), can generate PHRs corresponding to the panels, i.e., PHRs for each panel. At this time, the values ​​of at least some parameter(s) applied to each panel may be the same or different.

[0145] In step S1109, the terminal (1110) transmits at least one PHR. The at least one PHR may be transmitted via at least one MAC-CE. At this time, if the base station (1120) operates multiple TRPs, the at least one PHR may be transmitted via the uplink channels of each TRP, or via the uplink channel of any one TRP.

[0146] In step S1111, the base station (1120) can perform power control using at least one PHR. For example, the base station (1120) can check the margin of the total transmission power of the terminal (1110) or the margin of the transmission power per panel based on at least one PHR, and can determine whether to increase, decrease, or maintain the power by considering the checked margin of the transmission power. Although not illustrated in FIG. 11, the base station (1120) can transmit a transmission power control (TPC) for power control to the terminal (1110). At this time, the information included in the TPC can be determined based on at least one PHR.

[0147] According to a procedure as in Fig. 11, a PHR may be transmitted from a terminal (1110) to a base station (1120), and power control for the terminal (1110) may be performed. At this time, the terminal (1110) may have multiple panels, and the base station (1120) may operate multiple TRPs for the terminal (1110).

[0148]

[0149] FIG. 12 illustrates an example of a procedure for transmitting PHRs per panel according to one embodiment of the present disclosure.

[0150] Referring to FIG. 12, in step S1201, the terminal checks the configuration for reporting multiple PHRs. The configuration for reporting PHRs can be obtained through configuration information received from the base station. For example, the configuration information can include information (e.g., twoPHRmode or multiplePHR) indicating that a single PHR including multiple PHRs or multiple PHs should be reported for one cell or for multiple cells. In this case, each PHR can be associated with a single reference signal resource set (e.g., an SRS resource set).

[0151] In step S1203, the terminal generates and transmits PHRs for each panel. In other words, the terminal can generate a first PHR for the first panel and a second PHR for the second panel. In other words, the terminal can generate and transmit PHRs that include information about power margins for each panel. At this time, the maximum power for each panel, the maximum power of the terminal, etc. can be considered. Here, the PHR for each panel can be understood as a PHR for each TRP or a PHR for each TCI-state. At this time, at least one of the MAC-CEs exemplified in FIGS. 9A to 10C or a modified form of the MAC-CE can be used.

[0152] As shown in Fig. 12, PHRs can be generated and transmitted for each panel. The following disclosure describes specific embodiments for generating and reporting PHRs, including methods for setting fields within a PHR and methods for calculating PH.

[0153]

[0154] A. Setting and operating the Pcmax value for calculating Pcmax and PH within the field

[0155] In the present disclosure, the PHR procedure can be operated in one or a combination of two or more of the following three ways, including a way in which the Pcmax for calculating the Pcmax and PH in the field indicated in the PHR MAC-CE can be set differently and operated. At this time, the setting for the PHR operation method can be set by higher layer signaling such as RRC and MAC-CE, and can be set and operated in the form of BWP specific, UE specific, cell specific, etc. Or, it can be used as a fixed operation method in the system. In this case, some signaling for PHR operation can be indicated through MIB, SIB, etc.

[0156]

[0157] - In the case of intra-cell M-TRP

[0158] In cell-internal M-TRP operation, the terminal may receive the setting of twoPHRmode through RRC signaling and report two PHs for one cell using MAC-CE such as at least one of FIG. 10a, FIG. 10b, and FIG. 10c. In this case, the terminal may calculate Pcmax and two PH values ​​in the field and perform PHR according to the following method.

[0159]

[0160] (Method 1) In the PHR MAC-CE, the Pcmax in the field can be set to a per-UE Pcmax or a per-panel Pcmax, and the Pcmax in the field can be applied as the Pcmax for PH calculation when calculating PH. That is, the Pcmax in the field and the Pcmax for PH calculation can be used as the same value. At this time, the PHR MAC-CE can include information indicating whether the Pcmax in the field is a per-UE Pcmax or a per-panel Pcmax. Through this method, flexible operation can be enabled by applying the settings for the Pcmax in the field and the Pcmax for PH calculation according to each transmission method. Hereinafter, the present disclosure describes specific embodiments of Method 1.

[0161] [Example 1-1] Using the PHR MAC-CE of FIGS. 9a to 10c, the terminal can use the reserved bit(s) to indicate whether the Pcmax in the field is a per-UE Pcmax or a per-panel Pcmax. When indicating using 1 bit, a value of '0' indicates a per-UE Pcmax, and a value of '1' indicates a per-panel Pcmax.

[0162] [Example 1-2] If the Pcmax in the field is the Pcmax per UE, the Pcmax for PH calculation can be set to 1 / 2 of the Pcmax per UE. At this time, the ratio value applied to each panel can be fixedly set to various values ​​other than 1 / 2, or can be variably determined through settings. For example, the same ratio can be applied to each panel, or different ratios can be applied. In addition, the sum of the Pcmaxes used for PH calculation in each panel can be equal to the Pcmax per UE, or can be set to a value smaller than or larger than it. In this way, when operating PHR by setting the ratio values, information indicating the ratio can be included in the PHR MAC-CE. Information indicating the ratio can be transmitted using the reserved bit(s) of the PHR MAC-CE.

[0163] As a method of indicating the aforementioned ratio, settings for multiple ratio values ​​can be transmitted to the terminal via RRC, and the terminal can include information indicating one of the ratio values ​​in the PHR MAC-CE. For example, if setting information for four different ratio values ​​is provided to the terminal via RRC, the terminal can include two-bit information indicating one of the four ratio values ​​in the PHR MAC-CE.

[0164] As described above, when the terminal selects and indicates one ratio value from among the ratio values ​​set by RRC, the terminal can determine the ratio value as follows. For example, since the Pcmax per UE is a power value that can vary over time, the terminal can determine the current ratio value by considering the Pcmax per UE at the time of the PHR MAC-CE report, taking into account the non-variable constrained output value, which is an implementation or physical output constraint of each panel. As another example, the terminal can determine an arbitrary ratio value based on the currently measured channel information in order to allocate power within a range that can guarantee the quality of the received signal in each TRP, taking into account the channel conditions to each TRP.

[0165]

[0166] (Method 2) A specific PHR method can be set according to the TDM, FDM, SFN, SDM transmission method and / or STxMP settings. The present disclosure below describes specific embodiments of Method 2.

[0167] [Example 2-1] If STxMP is set, Pcmax within the field is set to Pcmax per panel, and Pcmax for PH calculation can be set to Pcmax within the field. If STxMP is not set, Pcmax within the field is set to Pcmax per UE, and Pcmax for PH calculation can be set to Pcmax within the field.

[0168] In this example, when STxMP is set, data transmission from each panel to each TRP is possible, so it would be useful to obtain PH information per panel rather than per UE in each TRP. Therefore, regardless of the TDM, FDM, SFN, or SDM method, PHR can be set as described above depending on whether STxMP is set or not.

[0169] [Example 2-2] When TDM such as PUSCH repetition is set as the M-TRP transmission method and STxMP is set, Pcmax in the field is set to Pcmax per panel, and Pcmax for PH calculation can be set to Pcmax in the field. When TDM such as PUSCH repetition is set as the M-TRP transmission method and STxMP is not set, Pcmax in the field is set to Pcmax per UE, and Pcmax for PH calculation can be set to Pcmax in the field.

[0170] [Example 2-3] When TDM such as PUSCH repetition is set as the M-TRP transmission method, Pcmax in the field is set to Pcmax per UE regardless of whether STxMP is set, and Pcmax for PH calculation can be set to Pcmax in the field. In the case of TDM, since uplink data transmission is performed at different times, that is, uplink transmission is not performed simultaneously, when setting the maximum power value that can be transmitted through each panel, the transmission power per panel, such as in the case of simultaneous transmission such as FDM, SFN, and SDM, may not be considered. Therefore, in this case, Pcmax per UE can be set as Pcmax in the field and Pcmax for PH calculation.

[0171] [Example 2-4] When FDM, SDM or SFN, which performs M-TRP transmission at the same time through multiple panels, is set as the M-TRP transmission method, and STxMP is set, if there is no upper limit constraint value in the Pcmax setting per panel, the Pcmax value in the field can be set as the Pcmax per UE. The Pcmax for PH calculation is set to 1 / 2 of the Pcmax per UE, and the PH can be calculated. At this time, the ratio value applied to each panel can be fixedly set to a variety of values ​​other than 1 / 2, or can be variably determined through the setting. For example, the same ratio can be applied to each panel, or different ratios can be applied. In addition, the sum of the Pcmaxes for PH calculation used in each panel can be equal to the Pcmax per UE, or can be set to a value smaller than or larger than it. In this way, when operating PHR by setting the ratio values, information indicating the ratio can be included in the PHR MAC-CE. Information indicating the rate can be transmitted using the reserved bit(s) of the PHR MAC-CE.

[0172] [Example 2-5] In the case where FDM, SDM or SFN is set to transmit M-TRP at the same time through multiple panels as an M-TRP transmission method, and STxMP is set, if there is an upper limit constraint value for the Pcmax setting for each panel, PHR can be operated as follows depending on the situation.

[0173] For example, if the sum of the Pcmaxes per two panels is less than the Pcmax per UE, the Pcmax for calculating the Pcmax and PH within the field can be set to the Pcmax per panel.

[0174] As another example, if the sum of the Pcmaxes per two panels is greater than the Pcmax per UE, the Pcmax in the field may be set to the Pcmax per UE, and the Pcmax for PH calculation may be set to half of the Pcmax in the field. At this time, the ratio value applied to each panel may be fixedly set to a variety of values ​​other than 1 / 2, or may be variably determined through settings. For example, the same ratio may be applied to each panel, or different ratios may be applied. In addition, the sum of the Pcmaxes for PH calculation used in each panel may be equal to the Pcmax per UE, or may be set to a value less than or greater than it. In this way, when operating PHR by setting the ratio values, information indicating the ratio may be included in the PHR MAC-CE. The information indicating the ratio may be transmitted using the reserved bit(s) of the PHR MAC-CE.

[0175] In this way, in the case of this example, the Pcmax value for calculating Pcmax and PH within the field can be set based on a comparison of the panel-specific Pcmax values ​​of the terminal panels and the UE-specific Pcmax value.

[0176]

[0177] For various operations of the above-described methods and embodiments of each method, the PHR may include information indicating whether the Pcmax in the field is a per-UE Pcmax or a per-panel Pcmax, information indicating whether the Pcmax for PH calculation is a per-UE Pcmax, a per-panel Pcmax, or another form of calculation such as 1 / 2 of the per-UE Pcmax, and / or information on the ratio value used to set the Pcmax for PH calculation, if any.

[0178]

[0179] (Method 3) Pcmax for calculating Pcmax and PH in the field is always set to Pcmax per UE. At this time, when STxMP is set, the terminal can additionally provide information on per-panel Pcmax for each panel. The information can be transmitted to the network by being included in the PHR MAC-CE. Alternatively, the information can be transmitted through another MAC-CE. At this time, the same per-panel Pcmax value can be indicated to all panels, or different per-panel Pcmax values ​​can be indicated for each panel. The per-panel Pcmax value(s) can be indicated by transmitting a ratio value for the Pcmax value in the field. Alternatively, the per-panel Pcmax value(s) can be included in the capability information for the UE during the initial connection process of the terminal and the network.

[0180]

[0181] (Method 4) The terminal can transmit two PHs for one TRP, where the Pcmax in the field is set to the UE-specific Pcmax and the panel-specific Pcmax, respectively. For example, the terminal can transmit PHs for two TRPs in one cell using the PHR MAC-CE of FIG. 10a. If two PHs for one TRP, where the Pcmax in the field is set to the UE-specific Pcmax and the panel-specific Pcmax, respectively, are transmitted, the terminal can use the multi-entry PHR MAC-CE of FIGS. 10b and 10c. In this case, information indicating that these are two PHs for the same different TRPs of the same cell or different cells, and not PHs for different cells, can be included in the PHR MAC-CE. When using the MAC-CE of FIG. 10b, the MAC-CE field required for PH transmission for each TRP, not the active / inactive state for each cell, can be indicated using the C field. For example, it is possible to set '1' in two C fields and transmit a total of four PHs. At this time, since each of the two PHs is calculated based on the Pcmax in one field, the terminal can set the Pcmax values ​​in two different fields as Pcmax per UE and Pcmax per panel, respectively, and report two PHs per TRP. In addition, information indicating that the PHR is a PHR for TRPs in the same cell, not a PHR for different cells, can be transmitted through the reserved bit(s) of the PHR MAC-CE. For example, when using one reserved bit, the value '1' can indicate that it is a PH for Pcmax values ​​in different fields, not for different cells. In addition, the values ​​set to Pcmax in the fields can be fixed in the order of Pcmax per UE and Pcmax per panel. Alternatively, the opposite setting is also possible.Alternatively, another reserved bit within the PHR MAC-CE may be used to indicate whether the Pcmax within the field is a per-UE Pcmax or a per-panel Pcmax.

[0182] In applying the above-described methods and embodiments thereof, the proposed methods can be applied to perform PHR in simple, modified, extended, or combined forms.

[0183]

[0184] - In the case of inter-cell M-TRP

[0185] In cell-to-cell M-TRP operation, the terminal can receive the configuration of multiplePHR through RRC signaling and report the PH for each TRP belonging to each cell. In this case, the PH for each cell can be reported using the PHR MAC-CE of FIG. 9b, FIG. 9c, FIG. 10b, or FIG. 10c. In the case of M-TRP using two TRPs, the terminal can calculate and transmit one PH belonging to each cell. At this time, the Pcmax in the field for transmitting each PHR and the Pcmax for calculating the PH can be operated by applying the operation methods of the aforementioned methods 1, 2, 3, 4, and their corresponding embodiments in a simple, modified, expanded, or combined form.

[0186]

[0187] B. PHR Operation Method for M-TRP Operation

[0188] When reporting PH for each TRP in an M-TRP communication environment, the reporting method may vary depending on whether the PUSCH transmitting the PHR MAC-CE is for M-TRP or S-TRP transmission. Furthermore, the reporting method may vary depending on the timing of PHR triggering. Conversely, additional PHR triggering conditions may be required for efficient PHR performance for M-TRP. Therefore, the present disclosure proposes a PHR operation method for M-TRP communication.

[0189]

[0190] FIG. 13 illustrates an example of a procedure for transmitting a PHR based on a triggering condition according to one embodiment of the present disclosure.

[0191] Referring to FIG. 13, at step S1301, the terminal checks the PHR triggering conditions. In other words, the terminal checks the triggering conditions for PHR transmission. For example, the triggering conditions may be predefined. Alternatively, the triggering conditions may be set by the base station. The triggering conditions may be defined or set based on at least one of the TRP operation mode and the reception of control information.

[0192] In step S1303, the terminal transmits at least one PHR in response to satisfaction of a triggering condition. For example, the terminal may transmit at least one PHR through an S-TRP-based uplink channel or an M-TRP-based uplink channel. For example, when changing from an S-TRP-based communication mode to an M-TRP-based communication mode, or when changing from an M-TRP-based communication mode to an S-TRP-based communication mode, the terminal may transmit at least one PHR. At this time, control information instructing reporting of the PHR may be additionally received. As another example, when multiple TCI states are set, the terminal may transmit a PHR corresponding to each TCI state.

[0193] As illustrated in FIG. 12, at least one PHR may be transmitted in response to the satisfaction of a triggering condition. The present disclosure below describes specific embodiments of PHR reporting based on a triggering condition.

[0194]

[0195] - PHR triggering conditions for changing M-TRP operation in S-TRP

[0196] When changing from S-TRP operation to M-TRP operation, the UE may receive an indication of the change to M-TRP operation via DCI including UL grant or UL scheduling information. Accordingly, PHR may be triggered in response to receiving DCI information indicating the change from S-TRP operation to M-TRP operation. Accordingly, the UE may report PH(s) for two TRPs using the PHR MAC-CE.

[0197]

[0198] - When PHR MAC-CE is transmitted through S-TRP based PUSCH

[0199] After PHR triggering, the UE transmits a PHR MAC-CE. Since the MAC-CE is transmitted together with the PUSCH, if the PUSCH carrying the PHR MAC-CE corresponds to an S-TRP transmission, the UE must report PHs for two TRPs via a single PHR MAC-CE. In this case, the previously described methods 1, 2, 3, and 4 and their embodiments can be applied to perform PHR in a simple, modified, extended, or combined form.

[0200]

[0201] - When PHR MAC-CE is transmitted through M-TRP based PUSCH

[0202] After PHR triggering, the UE transmits a PHR MAC-CE. Since this MAC-CE is transmitted along with the PUSCH, if the PUSCH carrying the PHR MAC-CE corresponds to an M-TRP transmission, the UE has the opportunity to transmit two PHR MAC-CEs. The PHR MAC-CE can be transmitted in one of the following ways.

[0203] [Reporting Method #1]

[0204] One PHR MAC-CE is transmitted using one of the two PUSCHs, and the transmitted PHR MAC-CE includes PHs for two TRPs.

[0205] The PUSCH used to transmit the PHR MAC-CE may be determined based on an index or a position on a field associated with each TCI state among two indicated joint or UL TCI states. For example, in an S-DCI-based M-TRP operation, if two indicated joint or UL TCI states are indicated by the DCI, the PHR MAC-CE may be transmitted through the PUSCH corresponding to the first TCI state on the corresponding TCI field. Alternatively, the PHR MAC-CE may be transmitted through the PUSCH corresponding to the TRP that transmits the DCI. As another example, in an M-DCI-based M-TRP operation, the PHR MAC-CE may be transmitted through the PUSCH corresponding to the DCI whose CORESET index is 0.

[0206] [Reporting Method #2]

[0207] A PHR MAC-CE corresponding to each TRP can be transmitted through each PUSCH to be transmitted for each TRP. At this time, the PHR MAC-CE can only include the PH for the target TRP.

[0208] [Reporting Method #3]

[0209] A PHR MAC-CE corresponding to each TRP may be transmitted through each PUSCH transmitted for each TRP. At this time, each PHR MAC-CE may include PHs for not only the target TRP but also the remaining TRPs. That is, one PHR MAC-CE may include PHs for two TRPs. At this time, in the arrangement of PHs included in the PHR MAC-CE, the PH for the TRP that is the reception target of the PUSCH used to transmit the PHR MAC-CE may be arranged in the first position. Alternatively, in an S-DCI-based M-TRP operation, if two indicated combinations or UL TCI states are indicated by DCI, the PH for the TRP corresponding to the first TCI state on the corresponding TCI field may be arranged in the first position among the PH fields indicated in the PHR MAC-CE. Alternatively, in M-DCI-based M-TRP operation, the PH for the TRP that is the reception target of the PUSCH corresponding to the DCI whose index of CORESET is 0 may be placed in the first position among the PH fields indicated in the PHR MAC-CE.

[0210] [Reporting Method #4]

[0211] A PHR MAC-CE corresponding to each TRP can be transmitted through each PUSCH transmitted per TRP. At this time, the PHR MAC-CE can include different PHs based on the UE-specific Pcmax and the panel-specific Pcmax. A single PHR MAC-CE can indicate the PH for only one TRP. Alternatively, a single PHR MAC-CE can include PHs for both TRPs.

[0212]

[0213] The above-described reporting methods can be operated in simple, modified, expanded, or combined forms, and can be operated in combined or expanded forms with Method 1, Method 2, Method 3, Method 4, and their corresponding embodiments.

[0214]

[0215] - If the transmission of PUSCH in which PHR MAC-CE is transmitted is M-TRP TDM

[0216] After PHR triggering, the UE transmits a PHR MAC-CE. Since the MAC-CE is transmitted along with the PUSCH, if the PUSCH carrying the PHR MAC-CE corresponds to an M-TRP transmission, the UE has the opportunity to transmit two PHR MAC-CEs. At this time, if the M-TRP transmission method is TDM, the PUSCHs will have different transmission times. At this time, the following actions are possible depending on the PHR triggering time.

[0217] If the PHR triggering point is after the first PUSCH transmission in the M-TRP TDM transmission, or if the PHR triggering point is before the first PUSCH transmission in the M-TRP TDM transmission, but the period from the triggering point to the first PUSCH transmission is less than the processing time for PHR generation, the PHR MAC-CE may be transmitted through the second transmitted PUSCH.

[0218] If the PHR triggering time is before the first PUSCH transmission in the M-TRP TDM transmission, and the period from the triggering time to the first PUSCH transmission is longer than the processing time for PHR generation, the PHR MAC-CE may be transmitted via the first PUSCH. Alternatively, the above-described reporting methods #1 to #4 may be operated in a simple, modified, extended, or combined form, and may be operated in a combined or extended form with methods 1, 2, 3, 4, and their corresponding embodiments.

[0219]

[0220] The setting of Pcmax in all PHR-related fields proposed in this disclosure, the setting of Pcmax for PH calculation, and the PHR operation methods can be applied and operated in a simple, modified, extended, or combined form.

[0221]

[0222] The operations of the method according to the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes any type of recording device that stores information readable by a computer system. Furthermore, a computer-readable recording medium can be distributed across network-connected computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0223] Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

[0224] While some aspects of the present disclosure have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one or more of the most significant method steps may be performed by such a device.

[0225] A programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described in the present disclosure. The field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in the present disclosure. In general, the methods are preferably performed by some hardware device.

[0226] Although the present disclosure has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

Claims

1. In a method of operating a terminal in a wireless communication system, A step of establishing connections to multiple TRPs; A step of receiving configuration information including information instructing to report multiple PHRs (power headroom reports) for the multiple TRPs; A step of generating a plurality of PHRs based on a plurality of transmission configuration indicators (TCIs) linked to the plurality of TRPs; and A method comprising the step of transmitting the plurality of PHRs via at least one of the uplink channels of the plurality of TRPs.

2. In claim 1, The step of transmitting the plurality of PHRs through at least one of the uplink channels of the plurality of TRPs comprises: A method comprising the step of transmitting said plurality of PHRs to one of said plurality of TRPs.

3. In claim 1, The step of transmitting the plurality of PHRs through at least one of the uplink channels of the plurality of TRPs comprises: A step of transmitting a first PHR among the plurality of PHRs to a first TRP among the plurality of TRPs; and A method comprising the step of transmitting a second PHR among the plurality of PHRs to a second TRP among the plurality of TRPs.

4. In claim 1, A method in which each of the above plurality of PHRs is generated based on the maximum power of each panel of the terminal.

5. In claim 1, Each of the above plurality of PHRs includes a field indicating maximum power, The above field is set to the maximum power of the terminal or the maximum power per panel, A method wherein each of the plurality of PHRs includes information indicating whether the value set in the field is the maximum power of the terminal or the maximum power per panel.

6. In claim 5, A method wherein each of the plurality of PHRs includes information about the ratio of a maximum power value used to calculate a power headroom (PH) relative to the maximum power of the terminal.

7. In claim 6, A method wherein the information about the above ratio includes information indicating one of a plurality of candidate values ​​set by the base station.

8. In claim 5, A method wherein whether the above field is set to the maximum power of the terminal or the maximum power per panel is determined based on at least one of the settings of the STxMP operation or the settings of the transmission mode.

9. In claim 1, Each of the above plurality of PHRs includes a field indicating maximum power, A method wherein the PH included in each of the above plurality of PHRs is calculated based on a maximum power value different from the value set in the above field.

10. In claim 1, Each of the above multiple PHRs contains two PHs for one TRP, A method wherein the above two PHs include PHs calculated based on different maximum power values.

11. In claim 1, A method in which the above plurality of PHRs are generated and transmitted when a change is performed between a communication mode based on S-TRP and a communication mode based on M-TRP.

12. In a method of operating a base station in a wireless communication system, A step of establishing connections to a terminal and multiple TRPs; A step of transmitting configuration information including information instructing to report multiple PHRs (power headroom reports) for the multiple TRPs; A method comprising the step of receiving a plurality of PHRs generated based on a plurality of transmission configuration indicators (TCIs) linked to the plurality of TRPs through at least one of the uplink channels of the plurality of TRPs.

13. In claim 12, The step of receiving the above multiple PHRs is: A method comprising the step of receiving said plurality of PHRs via one of said plurality of TRPs.

14. In claim 12, The step of receiving the above multiple PHRs is: A step of receiving a first PHR among the plurality of PHRs through a first TRP among the plurality of TRPs; and A method comprising the step of receiving a second PHR among the plurality of PHRs through a second TRP among the plurality of TRPs.

15. In claim 12, A method in which each of the above plurality of PHRs is generated based on the maximum power of each panel of the terminal.

16. In claim 12, Each of the above plurality of PHRs includes a field indicating maximum power, The above field is set to the maximum power of the terminal or the maximum power per panel, A method wherein each of the plurality of PHRs includes information indicating whether the value set in the field is the maximum power of the terminal or the maximum power per panel.

17. In claim 16, A method wherein each of the plurality of PHRs includes information about the ratio of a maximum power value used to calculate a power headroom (PH) relative to the maximum power of the terminal.

18. In claim 17, A method wherein the information about the above ratio includes information indicating one of a plurality of candidate values ​​set by the base station.

19. In a wireless communication system, at a terminal, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed by said processor, control said terminal to perform operations; The above actions are, A step of establishing connections to multiple TRPs; A step of receiving configuration information including information instructing to report multiple PHRs (power headroom reports) for the multiple TRPs; A step of generating a plurality of PHRs based on a plurality of transmission configuration indicators (TCIs) linked to the plurality of TRPs; and A terminal comprising a step of transmitting the plurality of PHRs through at least one of the uplink channels of the plurality of TRPs.

20. In a base station operating in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed by said processor, control said base station to perform operations; The above actions are: A step of establishing connections to a terminal and multiple TRPs; A step of transmitting configuration information including information instructing to report multiple PHRs (power headroom reports) for the multiple TRPs; and A base station comprising a step of receiving a plurality of PHRs generated based on a plurality of transmission configuration indicators (TCIs) linked to the plurality of TRPs through at least one of the uplink channels of the plurality of TRPs.

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