Method and apparatus for transmitting power headroom report for simultaneous transmission across multiple panels in wireless communication system

Abstract

The present disclosure is to configure a method for transmitting an uplink signal in a wireless communication system, and a method for operating a terminal may comprise the steps of: establishing connections to a first transmission reception point (TRP) and a second TRP; receiving configuration information for a power headroom report (PHR) transmitted to at least one of the first TRP and the second TRP; and generating and transmitting at least one PHR on the basis of the configuration information, wherein the at least one PHR includes first power headroom (PH) information for the first TRP and second PH information for the second TRP.

Description

Method and device for transmitting power headroom report for simultaneous multi-panel transmission in a wireless communication system

[0001] The present disclosure relates to a method and apparatus for transmitting power headroom reporting for simultaneous transmission across multi-panels 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 and Reception Point (mTRP) 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. mTRP technology can solve the problem of reduced Quality-of-Service (QoS) when a terminal located at the cell-edge is far from the base station, and the problem of inter-cell interference from base stations located in different cells. Furthermore, MTPR technology can play a role in providing an additional communication path, 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 device and method for effectively transmitting a power headroom report for simultaneous transmission across multi-panel (STxMP) in a wireless communication system.

[0009] The present disclosure may provide a device and method for transmitting a PHR including power headroom (PH) information distinguished by panel in a wireless communication system.

[0010] The present disclosure may provide a device and method for determining a maximum transmission power for generating PH in a wireless communication system.

[0011] The present disclosure may provide a device and method for determining a value of a parameter for generating a PH using an offset for at least one of the panels in a wireless communication system.

[0012] 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.

[0013] As an example of the present disclosure, a method of operating a terminal in a wireless communication system includes the steps of establishing connections to a first transmission reception point (TRP) and a second TRP, receiving configuration information for a power headroom report (PHR) transmitted to at least one of the first TRP and the second TRP, and generating and transmitting at least one PHR based on the configuration information, wherein the at least one PHR may include first power headroom (PH) information for the first TRP and second PH information for the second TRP.

[0014] As an example of the present disclosure, a method of operating a base station in a wireless communication system includes the steps of establishing connections with a terminal to a first transmission reception point (TRP) and a second TRP, transmitting configuration information for a power headroom report (PHR) received as at least one of the first TRP and the second TRP to the terminal, and receiving at least one PHR generated based on the configuration information, wherein the at least one PHR may include first power headroom (PH) information for the first TRP and second PH information for the second TRP.

[0015] As an example of the present disclosure, in a wireless communication system, a terminal includes 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, the operations including: establishing connections to a first transmission reception point (TRP) and a second TRP; receiving configuration information for a power headroom report (PHR) transmitted to at least one of the first TRP and the second TRP; and generating and transmitting at least one PHR based on the configuration information, wherein the at least one PHR may include first power headroom (PH) information for the first TRP and second PH information for the second TRP.

[0016] As an example of the present disclosure, in a wireless communication system, a base station includes 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, the operations including: establishing connections with a terminal to a first transmission reception point (TRP) and a second TRP; transmitting configuration information for a power headroom report (PHR) received by at least one of the first TRP and the second TRP to the terminal; and receiving at least one PHR generated based on the configuration information, wherein the at least one PHR may include first power headroom (PH) information for the first TRP and second PH information for the second TRP.

[0017] 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.

[0018] The following effects may be achieved by embodiments based on the present disclosure.

[0019] According to the present disclosure, in a wireless communication system, a transmission method of an uplink signal can be set to a single TRP method or a multiple TRP method based on a single uplink DCI.

[0020] The present disclosure can efficiently switch the transmission method of an uplink signal based on a single uplink DCI in a wireless communication system.

[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] FIG. 9 illustrates an example of a procedure for a power headroom report (PHR) according to one embodiment of the present disclosure.

[0033] FIG. 10 illustrates an example of an arrangement of a terminal and a base station using multiple panels according to one embodiment of the present disclosure.

[0034] FIG. 11 illustrates an example of a procedure for transmitting a PHR including panel-specific PH information according to one embodiment of the present disclosure.

[0035] FIG. 12 illustrates an example of a procedure for transmitting a PHR by considering a panel-specific correction value according to one embodiment of the present disclosure.

[0036] FIG. 13 illustrates an example of a MAC-CE structure for a single entry PHR according to one embodiment of the present disclosure.

[0037] FIG. 14 illustrates an example of a MAC-CE structure for a multiple entry PHR according to one embodiment of the present disclosure.

[0038] 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.

[0039] 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.

[0040] 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.”

[0041] 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.”

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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)).

[0049] 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.”

[0050] The communication networks to which the embodiments are applied are not limited to those described below, and the embodiments may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the term "communication network" may be used interchangeably with the term "communication system."

[0051] Figure 1 is a conceptual diagram illustrating an embodiment of a communication system.

[0052] 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.

[0053] A plurality of communication nodes (110 to 130) can support a communication protocol specified in the 3rd generation partnership project (3GPP) standard (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). 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.

[0054] Figure 2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.

[0055] 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.

[0056] 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).

[0057] 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).

[0058] 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.

[0059] 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.

[0060] 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).

[0061] 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.

[0062] 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).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.

[0070] 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).

[0071] 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.

[0072] 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).

[0073] 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).

[0074] 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).

[0075] 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).

[0076] 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).

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.

[0086] 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.

[0087] 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."

[0088] Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.

[0089] 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.

[0090] Figure 7 is a conceptual diagram illustrating an embodiment of a slot in a communication system.

[0091] 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.

[0092] 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].

[0093] 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

[0094] 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.

[0095] 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."

[0096] 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.

[0097] 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.

[0098] Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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).

[0104] The search space information may include a coreset identifier (ID) associated with the search space, a period of PDCCH monitoring, and / or an offset. The period and offset of PDCCH monitoring may each 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.

[0105] 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).

[0106] Meanwhile, in 5G NR, Multiple Transmission and Reception Point (mTRP) 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, mTRP 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. Furthermore, MTPR technology can play a role in providing an additional communication path, that 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 millimeter wave bands.

[0107] In the standard, mTRP 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.

[0108] 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:

[0109] 1) Beam determination

[0110] 2) Beam measurement

[0111] 3) Beam reporting

[0112] 4) Beam sweeping

[0113] 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).

[0114] 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.

[0115] 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.

[0116] 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.

[0117] At this time, there are three main methods for setting the status of TCI for DL ​​channels and UL channels.

[0118] A. Joint TCI state indication method that is commonly indicated to DL / UL channels

[0119] B. DL channel separate TCI state indication method for setting TCI separately for DL ​​channel and

[0120] C. UL Channel Separate TCI State Indication Method

[0121] 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.

[0122] The Unified TCI framework was designed for a single TRP (sTRP) system in 3GPP Rel-17. However, 3GPP Rel-18 aims to expand to a multi-TRP (mTRP) system.

[0123]

[0124] 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 demands for massive access, high efficiency, high reliability, and ultra-low latency. mTRP is one of the techniques to address these issues and belongs to the category of MIMO technology. In the case of the mTRP technique, data transmission to a single terminal is performed from multiple TRPs with fragmented macro / small / pico / femto cell-level characteristics. The mTRP 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 at the cell edge. In Rel-15, the basic structure and related applications for mTRP were discussed and defined, and in Rel-16 and Rel-17, enhancement techniques for mTRP were discussed and defined. While the basic concept of mTRP existed in LTE, the mTRP-like concept in LTE was not suitable for newly defined deployments, such as the assumption of an ideal backhaul and the use cases targeted in 5G. Therefore, the discussion and definition of practical mTRP techniques can be seen to have begun in Rel-15 NR.

[0125] Methods supporting mTRP 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. This increases the overhead of channel information transmission and imposes 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 shown great interest in NCJT due to its low complexity, and it was introduced starting with 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.

[0126] The TCI state is one of the core techniques required for the mTRP technique. This is because, unlike LTE, the use of high-frequency bands such as FR2 allows for clustered antenna installation, making beam configuration, which requires high adaptability and low latency, important. The TCI state indication / setting to the terminal can be interpreted as transmit / receive beam configuration, and can mean QCL configuration from a downlink perspective and spatial filter configuration 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.

[0127] In Rel-17, enhancements were implemented to improve reliability and robustness of mTRP, 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.

[0128] 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.

[0129] Non-SFN techniques can be broadly divided into two types: one in which fully generated PDCCHs from each TRP are multiplexed in the time and / or frequency domain (e.g., mTRP-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.

[0130] 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.).

[0131] 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 mTRP to all downlink channels and uplink channels that can be used in an RRC connected state.

[0132] NR can utilize two main signals to determine downlink channel conditions: SSB and CSI-RS. SSB is transmitted periodically to synchronize time between the UE and the base station, eliminating the need for separate transmission requests and incurring less system overhead compared to CSI-RS. However, because SSB is transmitted only within a specific frequency range, it has limitations that make it difficult to use for channel condition determination in a specific frequency range that the UE wishes to measure or in a frequency range supported by the entire system. Both SSB and CSI-RS have their own strengths and weaknesses, allowing them to be used to determine downlink channel conditions differently depending on the given environment / conditions.

[0133] The current standard supports three main types of reporting of channel state information (e.g., CSI reporting), specifically, periodic reporting that reports channel state periodically, semi-persistent reporting that reports only for a certain period of time, and aperiodic reporting that reports channel state intermittently and one-time upon request from the base station. At this time, measurement values ​​reported for channel measurement (e.g., CSI-RS) can include up to eight items such as CQI / PMI / CRI (CSI-RS resource indicator) / SSBRI / LI / RI / RSRP / SINR or capability index. Basically, resource information about CSI-RS used for measuring channel state can be transmitted from the base station to the terminal through RRC configuration (e.g., CSI-Measconfig). This information includes not only configuration information about the resource itself, such as the location and period on the time / frequency axis where the resource is transmitted, and the type of the resource, but also reporting information about how measurement reporting for the related resource can be performed. In addition, the 'type' can be independently set for the resource and the report. For example, if aperiodic reporting is requested, the terminal can perform measurements on all CSI-RS resources regardless of their types, such as periodic, quasi-static, or aperiodic. As another example, if periodic reporting is requested, only CSI-RS resources set to the periodic type among the three types can be measured. As another example, if quasi-static reporting is requested, the terminal can perform measurements using only CSI-RS resources set to two resource types (e.g., periodic or quasi-static).

[0134] Regarding the CSI-RS resource configuration method, the CSI-RS resource configuration supported by NR basically has a hierarchical structure. That is, a group of RE objects that exist with a specific pattern in the time / frequency domain to indicate the factor for acquiring minimum channel information are called 'resources', and a 'resource set' is separately defined to indicate / configure a group of 'resources' at once. Therefore, a separate ID is assigned to distinguish each resource and resource set, and different resource sets can be composed of different resources or include the same resources. Additionally, the standard defines a resource configuration (e.g., CSI-ResourceConfig) by regrouping resource sets to utilize resources and resource sets more flexibly, and assigns a specific ID to the set of resource sets.

[0135] In order to distinguish between the 'resource configuration' commonly used to refer to the resource configuration itself and the 'resource configuration' indicating a group of corresponding CSI-RS resource sets, the present disclosure refers to a group of CSI-RS resource sets as a 'CSI-RS resource set list' or 'set list'. In addition, for convenience of description, the present disclosure refers to periodic / semi-persistent / aperiodic as 'P / SP / A', respectively, and refers to them as P CSI-RS, AP CSI-RS, etc. Typically, a type for a resource (e.g., P / SP / A) can be set in units of set lists, and thus resource sets and resources included in the same set list can be regarded as resources of the same type. Since resource sets and resources included in the same set list have the same type, reporting can often be requested or performed in units of the corresponding set list. In summary, it can be seen that the resource configuration of CSI-RS is done through a hierarchical structure in the order of ‘CSI-RS resource’, ‘CSI-RS resource set’, and ‘CSI-RS resource set list’.

[0136] Information about a report is transmitted together with information about resource configuration, and may include allocation information for different set lists depending on the purpose (e.g., channel measurement, interference measurement, etc.), information about the type of report (e.g., P / SP / A), information about the time and frequency domains where measurement is required, and information about what information should be included, etc., and all information required for reporting from a terminal may be included. P-CSI reporting can be performed via PUCCH, SP-CSI reporting can be performed via PUCCH or PUSCH, and AP-CSI reporting can be performed via PUSCH. This is because the amount of information required for AP-CSI reporting is relatively larger than that for P-CSI reporting.

[0137] The procedure for each reporting type can be briefly summarized as follows. Basically, as mentioned above, information about resources and reports is transmitted from the base station to the terminal via RRC. In the case of periodic reporting, after being configured via RRC, the terminal measures the downlink channel via CSI-RS periodically transmitted without separate triggering signaling, and transmits the acquired channel information to the base station according to the reporting cycle configured via RRC. On the other hand, in the case of SP-CSI reporting, as an intermediate form between periodic and aperiodic reporting, a separate activation signaling is transmitted from the base station to the terminal via MAC-CE. The terminal periodically transmits information about the measured channel to the base station via CSI-RS periodically transmitted until the base station's deactivation signaling is separately transmitted via MAC-CE. In other words, unlike AP-CSI reporting, SP-CSI reporting has separate activation / deactivation signaling, and the terminal acquires / reports information about the channel through CSI-RS that exists between the two signalings. In the case of A-CSI reporting, triggering signaling is separately transmitted from the base station to the terminal through DCI or MAC-CE after RRC configuration, and the triggering signaling instructs a one-time report to the terminal. At this time, the resource of the CSI-RS monitored by the terminal exists after N slots based on the triggering signaling, and timing information regarding the reporting to be made after M slots can also be transmitted when the base station transmits related information to the terminal through RRC configuration.

[0138] In Rel-18, individual data transmission through multiple panels of a terminal has become possible, and the base station can obtain 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). In the following description, the present disclosure may refer to the report on power headroom as a 'power headroom report (PHR)'. The power headroom indicates the remaining power other than the power currently used by the terminal for data transmission in units of subframes, and the transmission power for the corresponding data is a predicted value, not a value actually used for transmission. The power actually used for data transmission cannot exceed the maximum transmission power supported by the terminal, but the predicted data transmission power may exceed the maximum transmission power value supported by the terminal. Therefore, the reported power headroom can have both positive and negative values. Typically, power headroom reports are transmitted from the UE to the BS via the MAC layer, which is a higher layer than the physical layer. The reported value / index is mapped to one of the power ranges according to a table defined in the standard. For example, if the PH is reported as '0', the actual power headroom can have a value greater than or equal to -23 dB and less than -22 dB, and the number of bits transmitted via the MAC-CE can also vary depending on the number of these indices.

[0139] Regarding the conditions for triggering a PHR, triggering may occur under 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 the serving cell is activated. Here, an example of a specific condition may include a case where the value of path loss, which is significantly related to the transmission power setting, is greater than a change amount of a specific threshold value.

[0140] The present disclosure describes a method for setting PHRs, which aid in resource scheduling of a base station in uplink channel transmission through multiple panels of a terminal. For convenience of explanation, the present disclosure assumes a two-panel configuration, but this can also be applied to cases where three or more panels are used. Basically, a terminal can report a separate PHR for each panel. The path loss calculated for each PHR can be calculated based on an RS (e.g., linked via TCI state or QCL) associated with a beam configuration. In addition, the ability to perform PHR reporting for each panel may vary for each terminal, and the terminal can report to the base station whether it supports the corresponding function. At this time, it was agreed that the parameter for indicating whether PHR support for each panel is the same as the parameter (e.g., twoPHRmode) for indicating whether PHR reporting for multiple TRPs, which was supported before Rel-18, is used. The present disclosure proposes specific embodiments when extending the multiple PHRs reported for existing multiple TRPs to multiple panels of a terminal.

[0141]

[0142] FIG. 9 illustrates an example of a procedure for a power headroom report (PHR) according to one embodiment of the present disclosure.

[0143] Referring to FIG. 9, in step S901, the terminal (910) and the base station (920) perform access and connection establishment procedures for at least one TRP. That is, the base station (920) includes at least one TRP, and the terminal (910) can perform a random access procedure, connection establishment procedure, etc. for at least one TRP. Accordingly, the terminal (910) can transmit and / or receive signals with at least one TRP.

[0144] In step S903, the base station (920) 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 regarding at least one of a request for the PHR, a PHR transmission time, a PHR structure, or a PHR calculation method. Accordingly, the terminal (910) may configure at least one parameter for calculating the PHR.

[0145] In step S905, the terminal (910) generates at least one PHR. That is, the terminal (910) generates at least one PHR to report the spare transmission power of the terminal (910) by considering at least one parameter set in advance. At this time, the terminal (910) has multiple panels and, depending on the settings or circumstances of the base station (920), can generate PHRs corresponding to the panels, i.e., PHRs for each panel. At this time, the values ​​of at least some of the parameter(s) applied to each panel may be the same or different.

[0146] In step S907, the terminal (910) transmits at least one PHR. The at least one PHR may be transmitted via at least one MAC-CE. In this case, if the base station (920) 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.

[0147] In step S909, the base station (920) can perform power control using at least one PHR. For example, the base station (920) can check the margin of the total transmission power of the terminal (910) 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 based on the checked transmission power margin. Although not illustrated in FIG. 9, the base station (920) can transmit a transmission power control (TPC) for power control to the terminal (910). At this time, the information included in the TPC can be determined based on at least one PHR.

[0148] According to a procedure as illustrated in FIG. 9, a PHR may be transmitted from a terminal (910) to a base station (920), and power control for the terminal (910) may be performed. At this time, the terminal (910) may have multiple panels, and the base station (920) may operate multiple TRPs for the terminal (910). An example of a configuration for a terminal (910) having multiple panels and a base station (920) operating multiple TRPs is as illustrated in FIG. 10 below.

[0149]

[0150] FIG. 10 illustrates an example of an arrangement of a terminal and a base station using multiple panels according to one embodiment of the present disclosure.

[0151] Referring to FIG. 10, a terminal (1010) has two panels (1012a and 1012b), and the panels (1012a and 1012b) correspond to a plurality of TRPs (1022a and 1022b). Specifically, the first panel (1012a) may be used for signal transmission and / or reception with the first TRP (1022a), and the second panel (1012b) may be used for signal transmission and / or reception with the second TRP (1022b). That is, the panels (1012a and 1012b) of the terminal (1010) may correspond 1:1 with the TRPs (1022a and 1022b). Therefore, in the following description, operations performed for each panel may be understood as operations performed for each TRP.

[0152] Each of the plurality of TRPs (1022a and 1022b) may provide uplink or downlink communication. Specifically, depending on one scenario, the first TRP (1022a) may support uplink and downlink communication, while the second TRP (1022b) may support uplink or downlink communication. Alternatively, depending on another scenario, the first TRP (1022a) may support uplink and downlink communication, while the second TRP (1022b) may support only uplink communication.

[0153]

[0154] Based on the aforementioned system configuration, a procedure for PHR reporting can be performed. The PHR reporting procedure according to various embodiments of the present disclosure can be performed considering multiple panels of a terminal and multiple TRPs of a base station. The present disclosure below describes specific embodiments for generating a PHR.

[0155]

[0156] [Proposal #1] RRC settings for PHR reporting per panel can be independently configured, either partially or entirely, for each panel. Typically, the parameters required for PHR-related RRC signaling may include at least one of the items listed below.

[0157] -phr-PeriodicTimer;

[0158] -phr-ProhibitTimer;

[0159] -phr-Tx-PowerFactorChange;

[0160] -phr-Type2OtherCell;

[0161] -phr-ModeOtherCG;

[0162] -multiplePHR;

[0163] -mpe-Reporting-FR2;

[0164] -mpe-ProhibitTimer;

[0165] -mpe-Threshold;

[0166] - numberOfN;

[0167] -mpe-ResourcePoolToAddModList;

[0168] - twoPHRMode

[0169] The definitions of the parameters described above can be understood based on the definitions in the standard. Since panels can be associated with different TRPs, associated with different channels, and terminal panel capabilities can vary, parameters can have different values ​​for each panel. Therefore, some or all of the parameters listed above can be set differently for each panel, and PHRs for each panel can be performed independently. For example, variables configured for periodic reporting (e.g., phr-PeriodicTimer) can be set differently, in which case PHRs can be transmitted with independent periodicities for each panel. Alternatively, parameters configured for event-based reporting of abrupt changes in path loss (e.g., phr-ProhibitTimer, phr-Tx-PowerFactorChange) can be set independently for each panel. The base station can transmit these variables differently for each panel, taking into account the channel conditions between the TRPs associated with multiple panels and the capabilities of each panel. Alternatively, a variable (e.g., multiplePHR) that conveys information on whether to transmit multiple PHR information through a single MAC-CE or multiple MAC-CEs can also be set for each panel. Since the characteristics of the maximum permissible exposure (MPE) may differ for each panel, parameters related to MPE (e.g., mpe-Reporting-FR2, mpe-ProhibitTimer, mpe-Threshold, numberOfN, mpe-ResourcePoolToAddModList, etc.) can also be set for each panel. Among the parameters mentioned above, for parameters that are set independently for each panel, signaling can be performed so that direct distinction is possible by transmitting them together with the panel index for panel distinction, or signaling can be performed so that it is implicitly linked to the setting order of the TCI state(s).Depending on the combination type, two TCI states or depending on the separation type, four TCI states can be set, and in this case, the group(s) of parameters regarding MPE per panel can include as many groups as the number of panels. For example, the group(s) of parameters regarding MPE per panel can include signaling#1{phr-PeriodicTimer, phr-ProhibitTimer, phr-Tx-PowerFactorChange}, signaling#2{phr-PeriodicTimer#2, phr-ProhibitTimer#2, phr-Tx-PowerFactorChange#2}. At this time, the TCI states or TRPs having QCL can be linked in descending or ascending order of the index of each signaled group.

[0170]

[0171] [Proposal #2] For Type #1, calculation of power headroom depending on the maximum output power of the terminal can be performed.

[0172] In general, power headroom for Type #1 can be broadly divided into two methods. In the first method, for cases where the scheduled PUSCH resources for the UE are clear, the power headroom for a PUSCH opportunity i within the BWP b of carrier f for the serving cell c is calculated as shown in [Mathematical Formula 1] below.

[0173]

[0174] Here, is the maximum transmission power of the terminal for the PUSCH transmission period i of carrier f of serving cell c, Is and The nominal power is the sum of is the bandwidth of PUSCH resource allocation expressed as the number of resource blocks of PUSCH transmission interval i for uplink BWP b of carrier f of serving cell c, is a value determined by the upper layer parameter p0alphasetindex of UL-TWG-Type1 or ULTWG-Type2 among the upper measurement parameter p0-pusch-alpha-set set for the uplink BWP b of carrier f of serving cell c, is a measurement value of the downlink path-loss of a terminal using a reference signal resource block for uplink BWP b of carrier f of serving cell c, is an adjustment value based on MCS for uplink BWP b of carrier f of serving cell c, refers to the PUSCH power control adjustment state for uplink BWP b of carrier f of serving cell c.

[0175] As a second method among the two methods, in a state where multiple CGs are set, since the base station does not know about the PUSCH resources that can be used for the actual PUSCH, in order to resolve the ambiguity about the PHR used for calculating the actual power headroom, there is a method of calculating the power headroom based on a specific reference PUSCH as shown in [Mathematical Formula 2] below.

[0176]

[0177] Here, is the maximum transmission power of the terminal for the reference PUSCH transmission period i of carrier f of serving cell c, Is and The nominal power is the sum of is a value determined by the upper layer parameter p0alphasetindex of UL-TWG-Type1 or ULTWG-Type2 among the upper measurement parameter p0-pusch-alpha-set set for the uplink BWP b of carrier f of serving cell c, is a measurement value of the downlink path-loss of a terminal using a reference signal resource block for uplink BWP b of carrier f of serving cell c, refers to the PUSCH power control adjustment state for uplink BWP b of carrier f of serving cell c.

[0178] The present disclosure refers to the first scheme as PH for actual PUSCH transmission, and the second scheme as PH for virtual or reference PUSCH transmission. According to an embodiment of the present disclosure, when calculating PH, a panel-specific distinction factor is included, and the factor is the configured maximum output power of the terminal (e.g., ) can be linked. In addition, the power headroom required for the reference PUSCH is a value that does not take into account the variables required to calculate the set maximum output power of the terminal (e.g., MPR=0 dB, A-MPR=0 dB, P-MPR=0 dB and T C =0 dB).

[0179] In this disclosure, and For the convenience of explanation, since it does not present the definition and calculation method for and is referred to comprehensively as the 'terminal's set maximum output power'. If and In cases where a distinction is required, the present disclosure provides a set maximum output power (e.g., ) and the set maximum output power of the terminal required for virtual PUSCH transmission (e.g. ) can be distinguished and referred to.

[0180] The maximum output power of a terminal is defined as the sum of the maximum power that can be output from all antenna connectors of the terminal and the error tolerance, etc. In other words, it can be seen that the actual transmission power and the reference PUSCH power are calculated without distinction of the panel. That is, according to the current standard, since the calculation of the power headroom is linked to the sum of the maximum power transmitted by the connectors at the antenna terminal, there is no structure formed in which the power headroom can be reported for each panel. However, since the resource allocation for the physical channel is performed and the transmission is performed for each panel, the base station must know the information about the available transmission power for each panel, and therefore, panel-based PHR reporting is required. Therefore, at least in the mathematical formula described above, the set maximum output power of the terminal should be replaced with the maximum transmission power value that can be transmitted from the panel associated with the resource, rather than the value linked to the sum of the maximum transmission powers of the current connector terminals, and the terminal should report the calculated value for the power headroom for each panel to the base station. The method described above is used for calculating the PH for the reference PUSCH transmission. The same should be applied to the definition of .

[0181] In cases where per-panel transmit power is required and calculation is required, such as in STxMP, or when the twoPHR mode is enabled for the above-mentioned reasons or when physical channels are scheduled with multiple panels, the aforementioned method needs to be applied when calculating PH. If the twoPHR mode is disabled, the power headroom is calculated based on the maximum output power according to the existing definition of the terminal (e.g., the sum of the maximum powers transmitted from the connectors at the antenna terminal end). That is, the maximum output power of the terminal used for PH calculation according to the twoPHR mode (e.g., , )) is selected differently, and at least when twoPHR mode is enabled, PH is calculated based on the maximum output per panel. In addition, the nominal power (e.g. ), path loss, MCS, etc., variables required for additional correction (e.g. , , and ) are also distinguished by panel and can be used for PH calculation. Information that requires a request from the base station, such as the exponential factor 'alpha' for path loss calculation, can also be set for each panel. However, since the panels from the terminal's perspective are not geographically distant, the value can be transmitted from the base station to the terminal through a single variable, taking signaling overhead into account.

[0182] If the transmit power calculation and power headroom reporting for the uplink channel are performed on a per-panel basis, a distinction must be made between the twoPHR mode for mTRP and the twoPHR mode for STxMP prior to Rel-18. This is because, at least in the twoPHR mode for mTRP, transmit power calculation and power headroom calculation are based on the "terminal configured maximum output power," which is the output at the end of the antennas, not on the panel. Therefore, the twoPHR modes can be distinguished depending on the scenario, and a method for distinguishing between them may also be necessary. For example, if resources are allocated on a panel basis, the panel-based configured maximum output power can be automatically used, and if not, the existing terminal configured maximum output power can be used. Alternatively, when setting PHR information, an indication information indicating whether the panel-based configured maximum output power is used can be additionally set to the terminal via RRC. Alternatively, when the terminal reports a PHR, information indicating whether the panel or the UE's own configured maximum output power was used can be included.

[0183]

[0184] FIG. 11 illustrates an example of a procedure for transmitting a PHR including panel-specific PH information according to one embodiment of the present disclosure.

[0185] Referring to FIG. 11, in step S1101, the terminal checks the maximum transmission power for each panel. That is, the terminal uses multiple panels (e.g., a first panel, a second panel), and depending on the structure, size, etc. of the panels, the maximum transmission power for each panel may be different or the same. At this time, according to one embodiment, when uplink transmission using multiple panels is set, the terminal can check the maximum transmission power for each panel. In addition, according to one embodiment, when the base station instructs to use the maximum transmission power for each panel, the terminal can check the maximum transmission power for each panel.

[0186] In step S1103, the terminal transmits a PHR including PH information for each panel. That is, the terminal generates a PHR including PH information (e.g., first PH information and second PH information) for each panel based on the maximum transmission power for each panel, and transmits the PHR. At this time, the PHR may be transmitted through a channel of a TRP corresponding to one of a plurality of panels, or may be transmitted through channels of a plurality of TRPs corresponding to the plurality of panels. At this time, the PHR may be transmitted through a plurality of MAC-CEs separated for each panel (e.g., a first MAC-CE including the first PH information and a second MAC-CE including the second PH information), or may be transmitted through a single MAC-CE including PH information for the panels.

[0187]

[0188] [Proposal #3] For type #3, calculation of power headroom depending on the maximum output power of the terminal can be performed.

[0189] According to the standard, the power headroom for PHR for SRS transmission, like PUSCH, is calculated differently depending on the actual SRS transmission and the reference SRS transmission. The power headroom for the actual SRS transmission can be calculated as shown in [Mathematical Equation 3] below, and the power headroom for the reference SRS transmission can be calculated as shown in [Mathematical Equation 4] below.

[0190]

[0191] Here, is the maximum transmission power of the terminal for the SRS transmission interval i of carrier f of serving cell c, Is and The SRS resource set is the sum of Nominal power for, is the bandwidth of PUSCH resource allocation expressed as the number of resource blocks of SRS transmission interval i for uplink BWP b of carrier f of serving cell c, is the uplink BWP b and SRS resource set of carrier f of serving cell c. Among the set of upper measurement parameters p0-pusch-alpha-set, the value determined by the upper layer parameter p0alphasetindex of UL-TWG-Type1 or ULTWG-Type2, is the uplink BWP b and SRS resource set of carrier f of serving cell c. Measurement of the downlink path-loss of a terminal using the reference signal resource block, refers to the PUSCH power control adjustment state for uplink BWP b of carrier f of serving cell c.

[0192]

[0193] Here, is the maximum transmission power of the terminal for the reference SRS transmission interval i of carrier f of serving cell c, Is and The SRS resource set is the sum of Nominal power for, is the uplink BWP b and SRS resource set of carrier f of serving cell c. Among the set of upper measurement parameters p0-pusch-alpha-set, the value determined by the upper layer parameter p0alphasetindex of UL-TWG-Type1 or ULTWG-Type2, is the uplink BWP b and SRS resource set of carrier f of serving cell c. Measurement of the downlink path-loss of a terminal using the reference signal resource block, refers to the PUSCH power control adjustment state for uplink BWP b of carrier f of serving cell c.

[0194] As with PUSCH, for power headroom calculation for SRS, the terminal calculates and reports the transmit power and power headroom using the configured maximum output power based on the sum of the maximum powers that can be output from the connectors connected to all antennas of the terminal. At this time, the method described in [Proposal #2] mentioned above or [Proposal #4] described below can be utilized for SRS transmission. In the extension of the unified TCI framework to the mTRP scenario in the Rel-18 standard, the relationship between the configured TCI state(s) and the SRS resource sets can be explicitly indicated through RRC signaling, and information about each panel can be conveyed to the terminal in the following manner.

[0195]

[0196] [Proposal #4] In calculating power headroom, the terminal maximum output variable is used in the same way as before, but at least one additional correction value is applied to each terminal.

[0197] In the aforementioned proposals #2 and #3, the calculation formulas that use the sum of the maximum outputs at the antenna connectors without considering the maximum transmit power per panel are maintained, but a panel-specific offset value can be applied. That is, the terminal applies a panel-specific offset when calculating the power headroom and reports it to the base station. At this time, when applying the panel-specific offset value, a power class is defined for each panel, similar to a power class for the terminal, and the terminal can transmit information about the panel's power class together when transmitting information about the panel to the base station, such as a capability report. The base station can perform additional calculations based on the PHR value transmitted from the terminal, considering the power class for the transmitted panel. Alternatively, the base station can define an additional variable for an additional correction value when calculating the PHR for the panel associated with each TCI state(s) or QCL, and transmit offset information for each panel to the terminal. Accordingly, the terminal can calculate the PH using the offset information. For example, if the aforementioned offset is applied, [Equation 2] can be changed to [Equation 5] below.

[0198]

[0199] Here, is the maximum transmission power of the terminal for the reference PUSCH transmission period i of carrier f of serving cell c, Is and The nominal power is the sum of is a value determined by the upper layer parameter p0alphasetindex of UL-TWG-Type1 or ULTWG-Type2 among the upper measurement parameter p0-pusch-alpha-set set for the uplink BWP b of carrier f of serving cell c, is a measurement value of the downlink path-loss of a terminal using a reference signal resource block for uplink BWP b of carrier f of serving cell c, is the PUSCH power control adjustment state for uplink BWP b of carrier f of serving cell c, means the offset value of power for the corresponding panel.

[0200] That is, the sum of the maximum power that can be output from the antenna connector is used as is, but if the transmittable power of each panel is to be distinguished within the maximum power of each panel, the aforementioned offset value can be used. The aforementioned offset power is the maximum output power of the terminal (e.g. or )) can be expressed as a relative value such as dB, or as an absolute value such as dbm.

[0201] Alternatively, in the case of STxMP, it is also possible to redefine the terminal's configured maximum output power as a value that takes into account the aforementioned offset power. Ultimately, the final transmission power calculation for the uplink channel and the associated power headroom can be performed on a panel-by-panel basis. Furthermore, signals are individually precoded and transmitted in layers / ports mapped to each panel. At this time, the mapping relationship between layers / ports and SRS resources can be configured via DCI. Furthermore, alignment of TRP, beam, and panel is performed.

[0202]

[0203] FIG. 12 illustrates an example of a procedure for transmitting a PHR by considering a panel-specific correction value according to one embodiment of the present disclosure.

[0204] Referring to FIG. 12, in step S1201, the terminal determines a correction value for at least one panel. At this time, the correction value includes a value for adjusting at least one of the parameters used to determine the PH to match the corresponding panel. For example, at least one of the parameters may include at least one of maximum transmission power, nominal power, bandwidth, or path loss. For example, the correction value may be determined based on the properties of the panel (e.g., class) or may be signaled from the base station.

[0205] In step S1203, the terminal transmits the PHR generated by considering the correction value. That is, the terminal can generate a PHR including the PH for each panel by considering the correction value and transmit the PHR to the base station. At this time, the reference value for applying the correction value may include the parameter value of another panel or the parameter value corresponding to the entire terminal. According to one embodiment, the PHR may include information indicating whether to apply the correction value, the correction value, etc.

[0206]

[0207] [Proposal #4-1] In power headroom transmission for the reference SRS, the base station can separately set and / or indicate information about the reference SRS resource set to be used for measurement. This is because, although the set ID for the existing reference SRS is always defined to be set to '0', if the base station knows the capability information about the terminal's panels, its usability is required. For example, if one panel has more available power than another panel, the base station can request power headroom for the panel with the greater available power considering the resources to be allocated. Information about the TRP associated with a specific uplink resource is reception-related information from the base station's perspective and therefore has little usability, but information about the panel on which the transmission is directly performed can have greater usability in transmission on the uplink channel. Therefore, rather than specifying it as '0' or '1' in the standard, the base station can directly indicate the set ID through RRC or MAC-CE for dynamic control. The terminal calculates nominal SRS transmission power, path loss, and / or correction (e.g., adjustment state) values ​​using the RS based on the set ID of the corresponding reference SRS.

[0208] [#4-2] The base station can directly indicate the panel (e.g., antenna port / layer) associated with the reference RS to be used for PHR via RRC or MAC-CE. According to the standard, panel differentiation can be implicitly supported by distinguishing antenna ports or layers. Therefore, instead of directly indicating the panel used for the reference SRS resource, the base station can indicate the antenna port or layer associated with the panel. The terminal can expect a PHR for the SRS resource mapped to the indicated / configured antenna port or layer.

[0209] [Proposal #4-3] Default settings may be defined for ports or layers that are mapped to resources for a reference SRS for PHR. For example, if up to four layers are supported and one of the combinations of layers is {2 layers, 2 layers}, each of the two layer combinations may be associated with different panels, and the former two layers may be referred to as layer group #0, and the latter two layers may be referred to as layer group #1. The indexes for the layer groups may be assigned in descending or ascending order. In one embodiment, the index number for the unit (e.g., group) in which the layer combination is formed may be defined as the default. That is, when a combination of {1, 1}, {1,2}, {2, 1}, {2, 2} occurs, if it is decided to use layer group #0 as a resource for default PHR, it can be expected that PHR will be performed for SRS resources associated with layers corresponding to groups {1}, {1}, {2}, {2} for the electronic layer among the combinations.

[0210]

[0211] [Proposal #5] MAC-CE Design for PHR Reporting

[0212] According to the above-described embodiments, MAC-CE may be used to transmit PHR. Here, MAC-CE may have the following structure. FIG. 13 illustrates an example of a MAC-CE structure for a single entry PHR according to an embodiment of the present disclosure, and FIG. 14 illustrates an example of a MAC-CE structure for a multiple entry PHR according to an embodiment of the present disclosure. FIG. 13 and FIG. 14 show examples of MAC-CEs that can be used in an mTRP environment when reporting PH through MAC-CE, when transmitting multiple results through a single MAC-CE, and when reporting PH through multiple MAC-CEs. In the current MAC-CE design, TRP can be distinguished, but information about a certain panel or antenna port / layer cannot be expressed. That is, when the transmittable power of each panel is different, it is not possible to distinguish information about each panel on the current MAC-CE.

[0213]

[0214] According to one embodiment of the present disclosure, when transmitting a PHR for a PUSCH, SRS, or other uplink channel through a plurality of panels according to at least two PHR modes, the terminal transmits maximum outputtable transmission power values ​​for each panel at least as many times as the number of panels, and each reported PH may have a one-to-one mapping relationship with the corresponding maximum outputtable transmission power. Additionally, for distinguishing panels, a sequential mapping relationship with the group index described in [Proposal #4] may be used, or a panel ID or an inter-panel distinguishing factor may be additionally included.

[0215]

[0216] The content proposed in the present disclosure The proposed technology of the disclosure can be extended to not only PHR for uplink UL-SCH (e.g. PUSCH) transmission for a serving cell from an activated serving cell, but also other types of PHR such as SRS or DC such as EN-DC / NE-DC for a serving cell from an activated serving cell.

[0217] The panel-based transmission power setting and related power headroom calculation method of the present disclosure can be extended to all uplink channels in which transmission power calculation and related power headroom calculation are performed based on the set maximum output power of a terminal linked to the sum of the maximum powers transmitted by connectors at the antenna terminal end, and can be extended to panel-based transmission. In addition, the method can be extended to transmission power setting.

[0218] The panels described in this disclosure may be described as antenna ports or layers, and the antenna ports or layers for each panel may be distinct and interconnected. In this case, the antenna ports or layers may be associated with resources in singular or plural units. In this disclosure, for convenience of description, they are described singularly.

[0219] According to the proposed technology, the integrated TCI state framework is extended to the mTRP system, and further extended to enable transmission power distribution within the transmittable power per panel, and reporting of the power headroom accordingly, for power headroom reporting that may occur when transmitting uplink channels through multiple panels.

[0220]

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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 a first transmission reception point (TRP) and a second TRP; A step of receiving setting information for a power headroom report (PHR) transmitted by at least one of the first TRP and the second TRP; and A step of generating and transmitting at least one PHR based on the above setting information, A method, wherein said at least one PHR includes first PH (power headroom) information for said first TRP and second PH information for said second TRP.

2. In claim 1, A step of transmitting an uplink signal to the first TRP using the first panel of the terminal; and A method further comprising the step of transmitting an uplink signal to the second TRP using the second panel of the terminal.

3. In claim 1, The above first PH is generated based on the first maximum transmit power available for the first panel, A method wherein the second PH is generated based on a second maximum transmit power available for the second panel.

4. In claim 3, A method wherein the first maximum transmission power is determined based on an offset value for one of the parameters determining the PH.

5. In claim 4, A method wherein the above PHR includes information indicating the offset value.

6. In claim 4, A method wherein the offset value indicates a difference between the maximum transmission power of the terminal and the first maximum transmission power.

7. In claim 4, A method wherein the offset value indicates a difference between the second maximum transmission power and the first maximum transmission power.

8. In a method of operating a base station in a wireless communication system, A step of establishing connections to a terminal and a first transmission reception point (TRP) and a second TRP; A step of transmitting setting information for a power headroom report (PHR) received as at least one of the first TRP and the second TRP to the terminal; and A step of receiving at least one PHR generated based on the above setting information, A method, wherein said at least one PHR includes first PH (power headroom) information for said first TRP and second PH information for said second TRP.

9. In claim 8, A step of receiving an uplink signal transmitted using the first panel of the terminal through the first TRP; and A method further comprising the step of receiving an uplink signal transmitted using a second panel of the terminal through the second TRP.

10. In claim 8, The above first PH is generated based on the first maximum transmit power available for the first panel, A method wherein the second PH is generated based on a second maximum transmit power available for the second panel.

11. In claim 10, A method wherein the first maximum transmission power is determined based on an offset value for one of the parameters determining the PH.

12. In claim 11, A method wherein the above PHR includes information indicating the offset value.

13. In claim 11, A method wherein the offset value indicates a difference between the maximum transmission power of the terminal and the first maximum transmission power.

14. In claim 11, A method wherein the offset value indicates a difference between the second maximum transmission power and the first maximum transmission power.

15. 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 a first transmission reception point (TRP) and a second TRP; A step of receiving setting information for a power headroom report (PHR) transmitted by at least one of the first TRP and the second TRP; and A step of generating and transmitting at least one PHR based on the above setting information, A terminal, wherein said at least one PHR includes first PH (power headroom) information for said first TRP and second PH information for said second TRP.

16. 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 first transmission reception point (TRP) and a second TRP; A step of receiving setting information for a power headroom report (PHR) transmitted by at least one of the first TRP and the second TRP; and A step of generating and transmitting at least one PHR based on the above setting information, A base station, wherein said at least one PHR includes first PH (power headroom) information for the first TRP and second PH information for the second TRP.

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