Method and apparatus for selecting beam for beam report in wireless communication system

Abstract

The purpose of the present disclosure is to perform a beam report on the basis of radio link monitoring in a wireless communication system, and an operation method of a user equipment (UE) may comprise the steps of: receiving configuration information including at least one of a configuration for a triggering event for a user equipment-initiated / event-driven beam report (UE-BR) and a configuration for beam selection; receiving at least one of reference signals configured by a base station; acquiring a quality value for at least one of the reference signals; determining whether or not to perform a beam report, on the basis of the triggering event and the quality value for the at least one; and transmitting a report on beams selected on the basis of the configuration for beam selection.

Description

Method and device for selecting a beam for beam reporting in a wireless communication system

[0001] The present disclosure relates to beam reporting in a wireless communication system, and more particularly, to a method and apparatus for selecting a beam for beam reporting.

[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 terminals by utilizing multiple Transmission Reception Points (TRPs) that are physically separated. MTRP technology can solve the problem of reduced Quality-of-Service (QoS) when terminals located at the cell-edge are far from the base station, and the problem of inter-cell interference from base stations located in different cells. 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 millimeter wave bands.

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

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

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

[0008] The present disclosure may provide a method and device for effectively performing UE-initiated / event-driven beam reporting in a wireless communication system.

[0009] The present disclosure may provide a method and apparatus for selecting beams to be included in a beam report in a wireless communication system.

[0010] The present disclosure may provide a method and apparatus for determining conditions for selecting beams included in a beam report in a wireless communication system.

[0011] The present disclosure may provide a method and device for including a beam that does not satisfy a condition of a triggering event in a wireless communication system in a beam report.

[0012] The present disclosure may provide a method and apparatus for generating information about beams included in a beam report in a wireless communication system.

[0013] The present disclosure may provide a method and device for generating and transmitting a beam report based on a differential method in a wireless communication system.

[0014] The present disclosure may provide a method and apparatus for selecting a reference beam for a differential value in a wireless communication system.

[0015] The present disclosure may provide a method and apparatus for determining a reference value for a differential value in a wireless communication system.

[0016] The present disclosure may provide a method and apparatus for performing measurements for beam reporting within a time window in a wireless communication system.

[0017] The present disclosure may provide a method and apparatus for determining a quality value for determining whether a triggering event of a beam report is satisfied in a wireless communication system.

[0018] The present disclosure may provide a method and apparatus for determining a quality value transmitted through a beam report in a wireless communication system.

[0019] 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.

[0020] According to one embodiment of the present disclosure, a method of operating a terminal in a wireless communication system may include: receiving configuration information including at least one of a configuration for a triggering event for a user equipment-initiated / event-driven beam report (UE-BR) and a configuration for beam selection; receiving at least one of reference signals configured by a base station; obtaining a quality value for at least one of the reference signals; determining whether to perform beam reporting based on the triggering event and the quality value for the at least one; and transmitting a report for beams selected based on the configuration for beam selection. The configuration for beam selection may include information on the number of beams to be reported, and the selected beams may include at least one beam satisfying a condition of the triggering event and at least one beam not satisfying the condition of the triggering event, as many as the number of beams.

[0021] According to one embodiment of the present disclosure, a method of operating a base station in a wireless communication system may include the steps of transmitting configuration information including at least one of a configuration for a triggering event for a user equipment-initiated / event-driven beam report (UE-BR) or a configuration for beam selection, transmitting reference signals configured by the base station, and receiving a report on beams selected based on a quality value for at least one of the reference signals and the configuration for the triggering event or the beam selection. The configuration for the beam selection may include information on the number of beams to be reported, and the selected beams may include at least one beam satisfying a condition of the triggering event and at least one beam not satisfying the condition of the triggering event, as the number of beams.

[0022] According to one embodiment of the present disclosure, in a wireless communication system, a terminal may include at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the terminal to perform operations. The operations may include: receiving configuration information including at least one of a configuration for a triggering event for a user equipment-initiated / event-driven beam report (UE-BR) or a configuration for beam selection; receiving at least one of reference signals configured by a base station; obtaining a quality value for at least one of the reference signals; determining whether to perform a beam report based on the triggering event and the quality value for the at least one; and transmitting a report for selected beams based on the configuration for beam selection. The configuration for the beam selection includes information about the number of beams to be reported, and the selected beams may include at least one beam that satisfies the condition of the triggering event and at least one beam that does not satisfy the condition of the triggering event, as many as the number of beams.

[0023] According to one embodiment of the present disclosure, in a wireless communication system, a base station may include at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the base station to perform operations. The operations may include: transmitting configuration information including at least one of a configuration for a triggering event for a user equipment-initiated / event-driven beam report (UE-BR) or a configuration for beam selection; transmitting reference signals configured by the base station; and receiving a report on beams selected based on a quality value for at least one of the reference signals and the configuration for the triggering event or the configuration for the beam selection. The configuration for the beam selection may include information on the number of beams to be reported, and the selected beams may include at least one beam satisfying a condition of the triggering event and at least one beam not satisfying the condition of the triggering event, as many as the number of beams.

[0024] The proposed technology enables efficient performance of UE-initiated / event-driven beam reporting in a wireless communication system.

[0025] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects 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 resulting from implementing the configuration described in the present disclosure can also be derived from the embodiments of the present disclosure by those skilled in the art.

[0026] FIG. 1 illustrates a communication system according to an embodiment of the present disclosure.

[0027] FIG. 2 illustrates a block diagram of a communication node according to an embodiment of the present disclosure.

[0028] FIG. 3 illustrates a block diagram of a wireless device according to an embodiment of the present disclosure.

[0029] FIGS. 4A and 4B illustrate block diagrams of a transmission path and a reception path of a communication node according to an embodiment of the present disclosure.

[0030] FIG. 5 illustrates an example of a system frame in a wireless communication system according to an embodiment of the present disclosure.

[0031] FIG. 6 illustrates an example of a subframe in a wireless communication system according to an embodiment of the present disclosure.

[0032] FIG. 7 illustrates an example of a slot in a wireless communication system according to an embodiment of the present disclosure.

[0033] FIG. 8 illustrates the structure of time-frequency resources in a wireless communication system according to an embodiment of the present disclosure.

[0034] FIG. 9 illustrates an example of a quasi-co location (QCL) relationship between reference signals in a wireless communication system according to an embodiment of the present disclosure.

[0035] FIG. 10 illustrates the concept of a unified transmission configuration indicator (TCI) state in a wireless communication system according to an embodiment of the present disclosure.

[0036] FIG. 11 illustrates an example of a process for transmitting a TCI state in a multi-transmission reception point (M-TRP) structure in a wireless communication system according to an embodiment of the present disclosure.

[0037] FIG. 12 illustrates an example of a procedure for setting and operating a UE-BR (user equipment-initiated / event-driven beam report) in a wireless communication system according to one embodiment of the present disclosure.

[0038] FIG. 13 illustrates another example of a procedure for setting up and operating a UE-BR in a wireless communication system according to one embodiment of the present disclosure.

[0039] FIG. 14 illustrates an example of a procedure for transmitting a beam report in a wireless communication system according to one embodiment of the present disclosure.

[0040] FIG. 15 illustrates an example of a procedure for receiving a beam report in a wireless communication system according to one embodiment of the present disclosure.

[0041] FIG. 16 illustrates an example of a procedure for transmitting a beam report including information about a current beam in a wireless communication system according to one embodiment of the present disclosure.

[0042] FIG. 17 illustrates an example of a procedure for transmitting a beam report based on a differential method in a wireless communication system according to one embodiment of the present disclosure.

[0043] FIG. 18 illustrates an example of the relationship between an event detection time and a beam report in a wireless communication system according to one embodiment of the present disclosure.

[0044] 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.

[0045] 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.

[0046] 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.”

[0047] 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.”

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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 a radio resource control (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)).

[0055] 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.”

[0056] 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."

[0057] FIG. 1 illustrates a communication system according to an embodiment of the present disclosure.

[0058] 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.

[0059] 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.

[0060] FIG. 2 illustrates a block diagram of a communication node according to an embodiment of the present disclosure. The structure illustrated in FIG. 2 may be understood as the structure of at least a portion of a communication node, a base station, or a core network entity. The wireless device (200) illustrated in FIG. 2 may be a mobile terminal such as a smartphone, tablet PC, or wearable device, but is not limited thereto.

[0061] 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).

[0062] 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).

[0063] 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 weighted differently to effectively steer signals outgoing in a desired direction.

[0064] 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.

[0065] 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).

[0066] 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.

[0067] 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).

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] Meanwhile, a more detailed example of the structure of the control unit (210) and / or the transceiver unit (240) is shown in FIG. 3. FIG. 3 illustrates a block diagram of a wireless device according to an embodiment of the present disclosure. FIG. 3 illustrates the structure of a first wireless device (300a) and a second wireless device (300b) that transmit and / or receive signals. In FIG. 3, each of the first wireless device (300a) and the second wireless device (300b) may be a base station or a UE.

[0074] Referring to FIG. 3, a first wireless device (300a) can transmit a signal to a second wireless device (300b). A transmission processor (311) included in the first wireless device (300a) can receive data (e.g., a data unit) from a data source (310). The transmission processor (311) can receive control information from a controller (316). The control information can include at least one of system information, RRC configuration information (e.g., information set by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0075] 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.

[0076] 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).

[0077] Signals transmitted by the first wireless device (300a) may be received by the antennas (364a to 364r) of the second wireless device (300b). The signals received by the antennas (364a to 364r) may be provided to demodulators (DEMODs) included in the 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).

[0078] Meanwhile, the second wireless device (300b) can transmit a signal to the first wireless device (300a). The transmitting processor (368) included in the second wireless device (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).

[0079] 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).

[0080] Signals transmitted by the second wireless device (300b) may be received by the antennas (314a to 314r) of the first wireless device (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).

[0081] 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.

[0082] FIGS. 4A and 4B illustrate block diagrams of a transmission path and a reception path of a communication node according to an embodiment of the present disclosure.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] FIG. 5 illustrates an example of a system frame in a wireless communication system according to an embodiment of the present disclosure.

[0090] Referring to Figure 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.

[0091] 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."

[0092] FIG. 6 illustrates an example of a subframe in a wireless communication system according to an embodiment of the present disclosure.

[0093] Referring to Fig. 6, one subframe can include n slots, where n can be a natural number. Therefore, one subframe can be composed of one or more slots.

[0094] FIG. 7 illustrates an example of a slot in a wireless communication system according to an embodiment of the present disclosure.

[0095] 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.

[0096] 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].

[0097] 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

[0098] 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.

[0099] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting of only DL symbols may be referred to as a "DL slot," a slot consisting of only FL symbols may be referred to as an "FL slot," and a slot consisting of only UL symbols may be referred to as a "UL slot."

[0100] 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.

[0101] 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.

[0102] FIG. 8 illustrates the structure of time-frequency resources in a wireless communication system according to an embodiment of the present disclosure.

[0103] 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 can be defined as a "RE (resource element)". Resources consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain can be defined as a "REG (resource element group)". A REG can include K REs. A REG can be used as a basic unit for resource allocation in the frequency domain. K can be a natural number. For example, K can be 12. N can be a natural number. In the slot illustrated in FIG. 7, N can be 14. N OFDM symbols can be used as a basic unit for resource allocation in the time domain.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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).

[0108] The search space information may include a coreset identifier (ID) associated with the search space, a period of PDCCH monitoring, and / or an offset. Each of the PDCCH monitoring period and offset may be indicated on a slot-by-slot basis. In addition, the search space information may further include an index of the symbol at which the PDCCH monitoring operation begins.

[0109] 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).

[0110] 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, MTRP 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.

[0111] 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 base stations connected to the TRPs. 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.

[0112] 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:

[0113] 1) Beam determination

[0114] 2) Beam measurement

[0115] 3) Beam reporting

[0116] 4) Beam sweeping

[0117] 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).

[0118] Two antenna ports are said to be quasi-co-located when the channel characteristics of a symbol transmitted from one antenna port can be inferred from the channel characteristics of a symbol transmitted from the other antenna port. For convenience of explanation, in the following, when two antenna ports are quasi-co-located, we refer to them as having a QCL relationship.

[0119] FIG. 9 illustrates an example of a quasi-colocation (QCL) relationship between reference signals in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 9, the QCL relationship between reference signals for 5G and below can be extended to generate information regarding TCI states.

[0120] The synchronization signal block (SSB) can be used by terminals to synchronize with the network and acquire basic information. The SSB can be in a QCL relationship with the tracking reference signal (TRS). Therefore, when receiving the TRS, at least one of the Doppler shift, delay average, and spatial characteristics of the SSB can be utilized.

[0121] CSI-RS (channel state information - reference signal): CSI-RS can be used by the network to determine the characteristics of the wireless channel. There are two types of CSI-RS. CSI-RS (CSI ACQ) can be used for CSI reception, and CSI-RS (BM) can be used for beam management (BM).

[0122] SSB and CSI-RS (BM) may be in a QCL relationship with CSI-RS (CSI ACQ), and at least one of the average and spatial characteristics of Doppler shift and delay may be utilized for CSI-RS (CSI ACQ) reception.

[0123] CSI-RS(BM) and SSB may have a QCL relationship with PDCCH DMRS (physical downlink control channel demodulation reference signal), and at least one of Doppler shift / spread and average / spread and spatial characteristics of delay may be utilized for reception of PDCCH DMRS.

[0124] SSB, CSI-RS (BM) and CSI-RS (CSI ACQ) may be in a QCL relationship with PDSCH DMRS, and at least one of the mean / spread and spatial characteristics of Doppler shift / spread and delay may be utilized for reception of PDCCH DMRS.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] At this time, there are three main methods for setting the status of TCI for DL ​​channels and UL channels.

[0129] A. Joint TCI state indication method that is commonly indicated to DL / UL channels

[0130] B. DL channel separate TCI state indication method for setting TCI separately for DL ​​channel and

[0131] C. UL Channel Separate TCI State Indication Method

[0132] 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.

[0133] 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.

[0134] TCI status can be used to convey QCL relationships to terminals. TCI status contains information about QCL relationships and can be conveyed via DCI. Section 5.1.5 of 3GPP TS 38.214 defines the procedure for conveying QCL information as follows:

[0135]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147]

[0148] As above, the UE can be configured with TCI-State configuration lists through higher layer parameters (e.g., PDSCH-Config). The UE can decode the PDSCH using the TCI-State configuration lists. Each TCI state can include parameters that configure the QCL relationship between one or two downlink reference signals and the DM-RS port of the PDSCH, the DM-RS port of the PDCCH, or the CSI-RS port(s) of the CSI-RS resource. The QCL can be configured for the first DL RS using the higher layer parameter qcl-Type1, and for the second DL RS using qcl-Type2. The QCL types of the two DL RSs can be configured differently regardless of whether they are DL RSs with the same reference or different DL RSs. The QCL type corresponding to each DL RS can be configured by the higher layer parameter (e.g., qcl-Type in QCL-Info). The QCL type can have one of the following values:

[0149] - typeA: {Doppler shift, Doppler spread, average delay, delay spread}

[0150] - typeB: {Doppler shift, Doppler spread}

[0151] - typeC: {Doppler shift, average delay}

[0152] - typeD: {Spatial Rx parameter}

[0153] Here, the Spatial RX parameter can refer to any one of various parameters, such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0154] The base station can transmit configuration information regarding whether to apply information in the transmission configuration indication (TCI) field included in the downlink control information (DCI) to the terminal through upper layer signaling.

[0155] Additionally, the terminal may receive information regarding TCI states or TCI state pairs. For example, the base station may transmit multiple TCI states to the terminal via RRC signaling, and may set some of them as TCI states for CORESET. The terminal may receive an activation command. The activation command may be used to map TCI state(s) and / or TCI state pair(s) to codepoints in the DCI field 'transmission configuration indication'.

[0156] In addition, as shown in FIG. 10, a unified TCI state can be configured to set a beam by integrating multiple channels or reference signals. FIG. 10 illustrates the concept of a unified TCI (transmission configuration indicator) state in a wireless communication system according to an embodiment of the present disclosure. The base station can transmit information about beam settings for CSI-RS, CORESET, PDSCH, PUSCH, PUCCH, SRS, etc. to the terminal through the unified TCI state without having to transmit the TCI state for each channel to the terminal. Whether the unified TCI state is activated can be explicitly or implicitly transmitted to the terminal. For example, when the BWP of the CC does not have a TCI-State or TCI-UL-State configuration, the terminal can apply the TCI-State or TCI-UL-State configuration from the reference BWP of the reference CC configured by the unified TCI-StateRef.

[0157] A multiple transmission and reception point (M-TRP) technique can be proposed, in which communication is performed through multiple transmitting and receiving nodes. The M-TRP technique can be divided into a single control information technique (single downlink control information (S-DCI)) that controls transmission and reception through multiple nodes through a single control information, and a multiple downlink control information technique (multiple downlink control information (M-DCI)) that separately transmits information for each node. In addition, the procedure for transmitting TCI information may vary depending on whether TCI information for uplink and downlink is set separately or jointly.

[0158] FIG. 11 illustrates an example of a process for transmitting a TCI state in a multi-transmission reception point (M-TRP) structure in a wireless communication system according to an embodiment of the present disclosure.

[0159] Referring to Fig. 11, the configuration types related to TCI are classified into separate types and joint types. The separate type method is a method in which the TCI state is set through separate TCI state lists for uplink and downlink respectively, and the joint type method is a method in which the TCI state is set through the TCI state lists of the joint for uplink and downlink. The base station can convey the configuration type related to the unified TCI to the terminal through unifiedTCI-StateType in ServingCellConfig. In addition, the base station can convey information about the resource set for the reference signal to the terminal through PDSCH-Config, and the PDSCH-Config can be included in the BWP-Downlink IE.

[0160] Additionally, the terminal can be configured with a list of up to 128 TCI state configurations via upper layer parameters (e.g., dl-OrJointTCI-StateList in PDSCH-Config). The TCI configuration list can be used to provide criteria for determining ULTX spatial filters for dynamic-grant and configured-grant based PUSCH and PUCCH resources and SRS in BWP / CC.

[0161] Among the TCI state settings, the TCI state settings to be activated can be transmitted through the TCI state activation / deactivation MAC CE. The integrated TCI state activation / deactivation MAC CE can indicate the TCI state ID to be activated. The integrated TCI state activation / deactivation MAC CE includes a serving cell ID, a DL BWP ID, and a UL BWP ID. It can indicate a serving cell and a BWP to which the MAC CE can be applied as a code point. The Pi field can indicate whether each ith code point includes multiple TCI states or a single TCI state. When Pi = 1, the ith TCI code point includes multiple TCI states, and when Pi = 0, the ith TCI code point can include only a DL / joint TCI state or only a UL TCI state.

[0162] The D / U field can indicate whether the TCI state corresponding to the TCI state ID existing in the same octet is a DL / joint TCI state or an UL TCI state. Therefore, in FIG. 11, the D / U field belonging to the same octet as a separate type of DL TCI state and a joint type of TCI state can be set to 1, and the D / U field belonging to the same octet as a separate type of UL TCI state can be set to 0.

[0163] Unlike the integrated TCI state enable / disable MAC CE, the enhanced integrated TCI state enable / disable MAC CE for joint TCI states can jointly manage the TCI states of uplink and downlink, so the UL BWP ID can be omitted. The Fi,j field indicates whether the jth joint TCI state exists in the TCI state ID field associated with code point i of the DCI Transmission Configuration Indication field. Here, j can have the value 1 or 2. Therefore, in the case of the joint type as in step#2 of FIG. 11, up to two joint TCI states can correspond to each code point, and up to 16 joint TCI states can be activated.

[0164] Unlike the unified TCI state enable / disable MAC CE, the enhanced unified TCI state enable / disable MAC CE for separate TCI states may include an Fi,j field and a Si,j field. The Fi,j field indicates whether the jth DL TCI state exists in the TCI state ID field associated with the code point i of the DCI Transmission Configuration Indication field. The Si,j field indicates whether the jth UL TCI state exists in the TCI state ID field associated with the code point i of the DCI Transmission Configuration Indication field. Therefore, in the case of the separate type of step#2 of FIG. 11, since each code point can correspond to at most two DL TCI states and at most two UL TCI states, a maximum of 32 TCI states can be enabled.

[0165] A base station can transmit DCI to a terminal via a PDCCH. The DCI can include a transmission configuration indication field, and decoding can be performed using a TCI state corresponding to codepoint i of the transmission configuration indication field included in the DCI. As described above, the correspondence between codepoint i and a TCI state can be indicated by a TCI state activation command. That is, when a terminal receives a single TCI state for a CORESET or receives a MAC CE activation command for one or two of the TCI states provided for the CORSET, the terminal can assume that the DM-RS antenna port associated with PDCCH receptions within the CORESET is in a QCL relationship with one or more DL RSs configured by the TCI states.

[0166] A TCI state can be indicated by splitting it into two states. For example, if the terminal is provided with dl-OrJointTCI-StateList, the TCI states can be indicated through a combination of two TCI states (the first TCI state, the second TCI state, the first TCI state and the second TCI state, none). For example, if the terminal indicates the first TCI state through apply-IndicatedTCISate, the terminal can assume that the reference signal provided by the first TCI state and the DM-RS antenna port for PDCCH reception are in a QCL relationship.

[0167] If dl-OrJointTCI-StateList is provided to the UE and coresetPoolIndex is not provided to the UE or coresetPoolIndex is provided with 0 for the first coreset in the active DL BWP of the serving cell, the UE may assume that the DM-RS antenna ports for PDCCH reception in the first and second coresets and the DM-RS antenna ports for PDSCH reception scheduled by the DCI formats provided by PDCCH reception in the first and second coresets are in a QCL relationship with the reference signals provided by the TCI states specific to the first and second CORESETs, respectively. Furthermore, the UE may transmit the PUSCH scheduled by the DCI formats provided by PDCCH reception in the first and second CORESETs, respectively, using the spatial domain filters corresponding to the TCI states specific to the first and second CORESETs, respectively.

[0168] The TCI state can be used to transmit uplink signals. Uplink power control can be used to determine power for PUSCH, PUCCH, SRS, or PRACH transmissions. The UE can be configured not to maintain more than four path loss estimates simultaneously for PUSCH / PUCCH / SRS transmissions per serving cell.

[0169] For PUSCH, PUCCH, SRS, or PRACH transmissions, a transmission opportunity can be defined by a slot index within a frame, the first symbol within the slot, and the number of consecutive symbols. If the UE receives TCI states in dl-OrJointTCI-StateList, an RS index for downlink path loss estimation for PUSCH, PUCCH, or SRS transmission can be provided for each one or both TCI states for PUSCH, PUCCH, or SRS transmission opportunities.

[0170] Power control values ​​can be set explicitly or implicitly. For example, if followUnifiedTCI-StateSRS is set, power control values ​​are provided from p0AlphaSetforSRS associated with the TCI state. If followUnifiedTCI-StateSRS is not set, power control values ​​and an RS index for path loss estimation can be provided from the TCI state associated with the SRS resource with the lowest SRS-ResourceId. In this case, the overall SRS power value can be determined based on the sum of individual SRS power control values ​​and additional components according to the SRS resource set.

[0171] Hereinafter, the initial connection procedure between a terminal and a base station will be described. If the initial connection procedure is performed with the base station due to reasons such as the terminal's power on / off operation or loss of coverage, an identification procedure between the base station and the terminal may be required. First, the terminal may perform an initial cell search operation with the base station. The terminal may perform monitoring to receive a synchronization signal. The synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information within the cell. Based on the physical broadcast channel, the terminal may obtain information about the cell using at least one of the MIB or SIB. A block including all of the PSS, SSS, and PBCH may be referred to as a synchronization signal block (SSB).

[0172] A terminal can perform a random access procedure. The terminal can transmit a preamble to the base station and receive a random access response (RAR) from the base station. The RAR message can include a temporary identifier. The terminal can transmit MSG3 (or an RRC connection request message) using the scheduling information in the RAR, and the base station can perform a contention resolution procedure by transmitting MSG4 (or a contention resolution message) to the terminal in response to MSG3.

[0173] The base station can perform beam management based on the RACH opportunity used for preamble transmission in the random access procedure. For example, the base station can determine the beam on which the terminal received the synchronization signal based on the RACH opportunity in which the preamble was transmitted. As described above, a synchronization signal can also be included as a reference signal for indicating the QCL relationship, and the QCL relationship can be established based on the SSB received through the initial access procedure.

[0174] Additionally, a channel measurement procedure may be performed for beam management. The terminal may receive a reference signal from the base station. Based on this, the terminal may report channel state information (CSI) to the base station. The channel state information may include at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), and signal-to-noise ratio (SNR). The base station may use the received channel state information to adjust beamforming for the terminal or optimize radio resource allocation. For channel measurement, the base station may transmit configuration information for channel measurement to the terminal. The configuration information for channel measurement may include information related to a measurement target, a measurement cycle, and the like.

[0175] Base station and terminal beam settings can be managed through artificial intelligence (AI). For convenience, beam set B refers to the beam set where measurements are performed using AI / ML model input, and beam set A refers to the beam set determined based on AI / ML model inference. Beam sets A and B may contain beam information for the same frequency range.

[0176] Artificial intelligence can be used to infer spatial domain downlink beams for beam set A based on measurements of beam set B. As another example, artificial intelligence can be used to infer temporal downlink beams for beam set A based on past measurements of beam set B. Here, beam set A and beam set B may be different sets, or beam set B may be a subset of beam set A.

[0177] Additionally, the input of the artificial intelligence model can be formed from various combinations. For example, the input of the artificial intelligence can include at least one of an L1-RSRP measurement based on beam set B, other auxiliary information, a channel impulse response (CIR) based on beam set B, and a downlink Tx / Rx beam ID associated with the L1-RSRP measurement of beam set B.

[0178] The aforementioned artificial intelligence model can be designed to infer a beam including at least one of a downlink reception beam and a downlink transmission beam. In addition, the output of the artificial intelligence model can include at least one of a transmission beam, a reception beam, an L1-RSRP of the transmission beam, an L1-RSRP of the reception beam, an angle of the transmission beam, an angle of the reception beam, and other information.

[0179] The beam management method using an AI model is not limited to the aforementioned method. The AI ​​model can be configured in various ways by configuring inputs and outputs with various combinations of settings for beam sets A and B, performance monitoring, data collection, and auxiliary information.

[0180] Learning and inference methods can also be implemented in various ways. For example, artificial intelligence can be learned or trained using an AI / ML (artificial intelligence / machine learning) model. Learning and training can be performed by the network or the UE. Furthermore, learning and inference can be performed on different devices. For example, learning can be performed on the network and inference on the UE. Split learning can be performed in such a way that some of the learning is performed on a first device and some on a second device. Similarly to learning, split inference can be performed using multiple devices. Input data for inference can also be generated in various ways. For example, input data can be generated on the UE, and inference can be performed using the input data on the network. Furthermore, input data generated on the UE can be used for inference within the UE.

[0181]

[0182] The present disclosure hereinafter describes techniques related to beam reporting, and more particularly, UE-initiated / event-driven beam reporting (UE-BR) in a wireless communication system. In particular, the present disclosure relates to techniques for selecting beam(s) to be reported for performing UE-BR, and further relates to the structure of information about the beam(s) to be reported.

[0183]

[0184] The gNB can set a triggering event or triggering condition so that the UE can perform a beam reporting operation when a specific triggering condition is satisfied. In the present disclosure, for convenience of explanation, the operation of the UE performing a beam report by a set triggering event is referred to as UE-BR (UE-initiated / event driven beam reporting). That is, for the UE-BR operation, the gNB can configure a triggering condition for UE-BR using a combination of one or more of higher layer signaling such as RRC, MAC-CE, etc., and DCI.

[0185] UE-BR operation is performed based on the satisfaction of configured triggering events, but can be operated based on how the gNB enables (e.g., activates) or suspends (e.g., deactivates) the UE-BR operation. In this case, the indication indicating activation and / or deactivation can be conveyed via one of higher layer signaling such as RRC, MAC-CE, etc. or DCI. Alternatively, the indication of activation and / or deactivation of UE-BR can be indicated via one or a combination of higher layer signaling such as RRC, MAC-CE, etc. and DCI.

[0186] FIG. 12 illustrates an example of a procedure for setting up and operating a UE-BR in a wireless communication system according to one embodiment of the present disclosure. FIG. 12 illustrates signal exchange between a terminal (1210) and a base station (1220).

[0187] Referring to FIG. 12, in step S1201, the base station (1220) transmits configuration information related to UE-BR to the terminal (1210). Specifically, the base station (1220) transmits configuration information regarding triggering events and / or conditions, and the configuration information may be transmitted via RRC signaling, MAC-CE, or DCI.

[0188] In step S1203, the base station (1220) and the terminal (1210) configure triggering events and / or conditions for UE-BR. That is, the terminal (1210) can set triggering events and / or conditions for UE-BR based on the received configuration information. In addition, the base station (1220) can set triggering events and / or conditions for UE-BR of the terminal (1210) based on the configuration information.

[0189] In step S1205, the base station (1220) transmits a deactivating signal for UE-BR to the terminal (1210). Accordingly, the UE-BR function may be deactivated in the terminal (1210). That is, the terminal (1210) may at least temporarily suspend at least one operation for UE-BR.

[0190] In step S1207, the base station (1220) transmits an activating signal for UE-BR to the terminal (1210). Accordingly, the UE-BR function can be activated in the terminal (1210). That is, the terminal (1210) can resume at least one operation for UE-BR.

[0191] In Fig. 12, UE-BR can be used (e.g., activated) and / or stopped (e.g., deactivated) by deactivation signaling and activation signaling. However, according to another embodiment, in the configuration and operation of UE-BR, the activation and deactivation method for UE-BR may not be applied. In this case, without activation signaling and deactivation signaling as in Fig. 12, the terminal can perform UE-BR operation depending on whether the configured triggering event is satisfied.

[0192] In Fig. 12, in the configuration of the first UE-BR triggering event / condition, an indicator that explicitly or implicitly indicates activation of the UE-BR may be included. If the configuration does not include an activation and / or deactivation indicator, the base station may control the UE-BR to operate by transmitting an activation indication through activation signaling after configuring the triggering event / condition.

[0193] After UE-BR is configured, if the configured triggering condition is satisfied, the terminal performs UE-BR operation. At this time, a beam reporting operation may be performed for the number of beams (e.g., N) set by the base station. For example, the triggering event condition may include the presence of at least one beam having a quality better than that of the current beam. For convenience of explanation below, the present disclosure refers to 'the presence of at least one beam having a quality better than that of the current beam' as triggering event #0.

[0194] Here, the beam quality can be defined as a metric measuring beam quality such as L1-RSRP or other metric, and can be expressed as a measurement value for the metric. At the time when UE-BR is triggered, there may be at least one beam with better quality than the current beam, but there may be fewer than N beams. In this case, since the base station is configured to transmit reports for N beams, additional selection of at least one beam with worse quality than the current beam is required.

[0195] Here, a criterion is needed for selecting beams with inferior quality to the current beam. Therefore, the UE-BR triggering event / condition configuration of FIG. 12 may include a condition for selecting a beam for UE-BR (hereinafter referred to as a "beam selection condition"). Alternatively, signaling for a beam selection condition, distinct from the signaling for the UE-BR triggering event / condition configuration, may be additionally provided to the UE.

[0196]

[0197] FIG. 13 illustrates another example of a procedure for setting up and operating UE-BR in a wireless communication system according to one embodiment of the present disclosure. FIG. 13 illustrates a method for performing a triggering event / condition configuration for UE-BR and a beam report configuration including beam selection conditions as separate signaling, as a signal exchange between a terminal (1310) and a base station (1320).

[0198] Referring to FIG. 13, in step S1301, the base station (1320) transmits first configuration information related to UE-BR to the terminal (1310). Specifically, the base station (1320) transmits configuration information regarding a triggering event and / or condition, and the configuration information may be transmitted via RRC signaling, MAC-CE, or DCI.

[0199] In step S1303, the base station (1320) and the terminal (1310) configure triggering events and / or conditions for UE-BR. That is, the terminal (1310) can configure triggering events and / or conditions for UE-BR based on the received first configuration information. In addition, the base station (1320) can configure triggering events and / or conditions for UE-BR of the terminal (1310) based on the configuration information.

[0200] In step S1307, the base station (1320) transmits second configuration information related to UE-BR to the terminal (1310). Specifically, the base station (1320) transmits configuration information for beam reporting, and the configuration information can be transmitted via RRC signaling, MAC-CE, or DCI.

[0201] In step S1309, the base station (1320) and the terminal (1310) configure a beam report for UE-BR. That is, the terminal (1310) can define a configuration related to a beam report transmitted via UE-BR based on the received second configuration information. For example, the configuration related to the beam report can include selection conditions for the reported beam, a structure of information about the reported beam, etc.

[0202]

[0203] To measure the quality of candidate beams for UE-BR, the base station explicitly configures and transmits a reference signal to the terminal. Then, the terminal measures the quality of the beam through the received reference signals. If the quality of the measured beam satisfies the triggering condition, the UE-BR operation is performed. Specifically, the terminal can select N or fewer beams that satisfy the condition for selecting a beam (hereinafter, “beam selection condition”) among the measured beams, and report information on the selected beams to the base station. Operations for beam selection and reporting are described below with reference to FIGS. 14 and 15.

[0204] FIG. 14 illustrates an example of a procedure for transmitting a beam report in a wireless communication system according to an embodiment of the present disclosure. FIG. 14 also illustrates an operation method of a terminal.

[0205] Referring to FIG. 14, in step S1401, the terminal receives configuration information for a beam report. The configuration information may indicate beam selection conditions. Accordingly, the terminal can check the beam selection conditions, i.e., the conditions for selecting at least one beam to be reported, through the configuration information, and set at least one related variable (e.g., threshold, number, etc.). In addition, the terminal can check the format of the beam report (e.g., included items, etc.) through the configuration information. Furthermore, although not illustrated in FIG. 14, the terminal can receive configuration information for a triggering event together with or separately from the configuration for the beam report.

[0206] In step S1403, the terminal receives at least one reference signal. To this end, the terminal may receive configuration information about the reference signal from the base station and receive at least one reference signal based on the configuration information. Accordingly, the terminal may perform measurements on at least one reference signal and obtain a quality value (e.g., RSRP) for at least one beam corresponding to at least one reference signal.

[0207] In step S1405, the terminal can detect an event and select beams. The event may be predefined or determined by configuration information received from the base station. The event is defined based on a quality value for at least one reference signal and may be related to a quality value for the current serving beam, a quality value for at least one reference signal, etc.

[0208] At step S1407, the terminal may transmit a beam report. In other words, the terminal may transmit a message containing information about the selected beams. At this time, the terminal may generate information about the beams based on the configuration information for the beam report.

[0209]

[0210] FIG. 15 illustrates an example of a procedure for receiving a beam report in a wireless communication system according to one embodiment of the present disclosure. FIG. 15 also illustrates an operating method of a base station.

[0211] Referring to FIG. 15, in step S1501, the base station transmits configuration information for a beam report. The configuration information may indicate beam selection conditions. That is, the base station may determine beam selection conditions, i.e., conditions for selecting at least one beam to be reported, and signal the beam selection conditions. In addition, the base station may determine the format of the beam report (e.g., included items, etc.) and signal the format of the beam report. Furthermore, although not illustrated in FIG. 15, the base station may transmit configuration information for a triggering event together with or separately from the configuration for the beam report.

[0212] In step S1503, the base station transmits reference signals. To this end, the base station may transmit configuration information regarding the reference signals and transmit the reference signals based on the configuration information. Accordingly, the terminal may perform measurements on at least one of the reference signals and obtain a quality value (e.g., RSRP) for at least one beam corresponding to the at least one reference signal.

[0213] At step S1505, the base station may receive a beam report. That is, the base station may receive a message containing information about beams selected by the terminal. At this time, the beam report may contain information about beams generated based on configuration information for the beam report.

[0214]

[0215] FIG. 16 illustrates an example of a procedure for transmitting a beam report including information about a current beam in a wireless communication system according to an embodiment of the present disclosure. FIG. 16 also illustrates an operating method of a terminal.

[0216] Referring to FIG. 16, in step S1601, the terminal generates information about a beam that satisfies an event. Here, the event is an event configured to trigger a beam report and can be detected based on a quality value for at least one reference signal received from the base station. Since a beam that satisfies the event condition is included in the report target, the terminal can generate information about the beam that satisfies the event (e.g., information about the quality value).

[0217] In step S1603, the terminal generates information about the selected beam based on the quality value. When the number of beams reported through the beam report (hereinafter referred to as the "number of beams to be reported") is configured, the number of beams satisfying the event may be less than the number of beams to be reported. In this case, the terminal may select at least one beam among the beams that do not satisfy the event as a reporting target. At this time, the terminal may select at least one beam based on the configured beam selection conditions.

[0218] In step S1605, the terminal generates information about the current beam. That is, the terminal may perform measurements on the current beam and generate information indicating a quality value of the current beam to include information about the current serving beam (e.g., a beam indicated by a TCI signaled for data reception) in the beam report. However, depending on the configuration of the beam report, if information about the current beam is not required, this step may be omitted.

[0219] In step S1607, the terminal transmits a beam report including the generated information. The terminal can generate and transmit a beam report including information about the beams generated in the previous steps. That is, the beam report can include information about at least one beam that satisfies the event, at least one beam that does not satisfies the event, or at least one of the current beams.

[0220]

[0221] In the aforementioned embodiments, beam selection conditions may be applied uniformly, rather than differently for each triggering event, terminal, or time point. For example, beam selection conditions that select the beam with the best quality may be configured and operated. In this case, UE-BR can be performed without changing or additionally setting beam selection conditions.

[0222] In the embodiments described above, specific beam selection conditions may be configured through beam report configuration, etc., and UE-BR may be operated. At this time, if signaling for configuring specific beam selection conditions is not performed, the selection of N beams may be performed by sequentially selecting beams satisfying the current triggering event condition and beams with the best quality (e.g., selecting in descending order of measurement values ​​starting from the beam with the largest measurement value) so as to select the N beams. Alternatively, regardless of the triggering event condition, the beam selection condition may be applied so as to select the N beams by sequentially selecting beams with the best quality based on the quality of the measured beams.

[0223] For example, when triggering event #0 is configured, if no specific beam selection condition is additionally set, a method of selecting N beams may be applied by sequentially selecting beams having the best quality based on the quality of the measured beams, including beams having better quality than the current beam. That is, if a beam selection condition is configured, beams are selected based on the configured condition, but if not, beams having the best quality may be selected. Alternatively, if a beam selection condition is not configured, the procedure may be defined to report only beams having better quality than the current beam. In this case, fewer than N beams may be reported.

[0224] According to various embodiments of the present disclosure, the following conditions may be configured and operated as beam selection conditions. For example, beam selection conditions may be configured for each triggering event. Alternatively, beam selection conditions may be configured for each terminal. Alternatively, beam selection conditions may be configured for each terminal or triggering event at a specific time. The three conditions exemplified below may be applied differently through simple modification, combination, or expansion.

[0225] [Beam Selection Criteria #1] Select a beam with a quality above a certain threshold.

[0226] [Beam Selection Criteria #2] Select a beam with a quality that is within a certain threshold of the difference from the best quality.

[0227] [Beam Selection Condition #3] Select a beam with a quality that is within a certain threshold compared to the quality of the current beam.

[0228] In the examples of beam selection conditions described above, specific thresholds may be included in the UE-BR triggering event / condition configuration or beam reporting configuration. And, specific thresholds may be changed by RRC, MAC-CE, or DCI.

[0229] When the terminal measures as many beams as the number of reference signal resources configured for measurement of beams and selects N beams, the number of resources of the configured reference signals (e.g., R) can be configured to a value greater than or equal to N. If R is less than N while UE-BR is triggered, the number of reported beams N can be adjusted to a value equal to or less than R.

[0230]

[0231] According to one embodiment, the quality value of a beam reported by a terminal may include a difference value compared to the quality value for a specific beam. For example, a quality value (e.g., L1-RSRP value) for a reference beam (hereinafter referred to as a "reference beam") may be transmitted, and a differential value compared to the quality value of the reference beam may be transmitted for the remaining beams. The operation of the terminal according to the differential method using the difference value is as follows.

[0232] FIG. 17 illustrates an example of a procedure for transmitting a beam report based on a differential method in a wireless communication system according to one embodiment of the present disclosure. FIG. 17 also illustrates an operating method of a terminal.

[0233] Referring to FIG. 17, in step S1701, the terminal verifies the quality value of the reference beam. Here, the reference beam corresponds to a quality value standard for determining the difference value of the quality values ​​below, and can be defined in various ways. The reference beam can be determined by a predefined rule or indicated by the base station.

[0234] In step S1703, the terminal determines the difference in quality values ​​of the remaining beams compared to the reference beam. Here, the remaining beams include the beams included in the beam report, excluding the reference beam. That is, the terminal generates information representing the quality values ​​of the remaining beams, i.e., a differential value.

[0235] In step S1705, the terminal transmits a beam report including the quality value of the reference beam and the difference values ​​of the remaining beams. That is, the terminal can generate information about beams based on a differential method and transmit a beam report including information about the generated beams. At this time, the difference value can be expressed as the difference between the quality value of the corresponding beam and the quality value of the reference beam, or as the number of step sizes corresponding to the difference.

[0236] As described with reference to FIG. 17, beam reporting can be performed based on a differential method. Various embodiments of the differential method are as follows.

[0237] If the base station is configured to include information about the current beam in the beam report, the terminal can report up to N+1 beams. In this case, the reference beam can be the beam with the highest quality value among the current beam or the measured beams. If the base station is configured not to report the current beam, the terminal can report up to N beams, and the reference beam can be the beam with the highest quality value among the measured beams. Therefore, regardless of whether the current beam is reported or not, the beam with the highest quality value among the measured beams can always be used as the reference beam.

[0238] Alternatively, the reference beam may be configured differently depending on the triggering event or triggering method or beam quality measurement method. For example, in a specific triggering event or triggering method or beam quality measurement method, the reference beam may be adaptively selected depending on whether reporting is performed on the current beam of the base station in a specific triggering event or triggering method or beam quality measurement method. If reporting on the current beam is configured, UE-BR may be performed based on the current beam. Accordingly, in reporting the difference in L1-RSRP, the difference value compared to the quality value of the current beam may be reported for each beam through UE-BR. Conversely, if reporting on the current beam is configured not to be performed, UE-BR may be performed based on the beam having the highest quality value among the measured beams. In this case, in reporting the difference in L1-RSRP, the difference value compared to the quality value of the beam having the highest quality may be reported for each beam through UE-BR.

[0239] Unlike the aforementioned method, UE-BR can be operated so that the difference value of the quality value is transmitted based on a specific threshold value rather than a specific beam. In other words, the difference value compared to a specific threshold value, rather than the difference value compared to the quality value of the reference beam, can be reported as the quality value of the beam.

[0240]

[0241] FIG. 18 illustrates an example of the relationship between an event detection time and beam reporting in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 18, multiple measurement opportunities (1804-1 to 1804-8) exist during a time window (1802). Accordingly, the terminal sequentially performs measurements within the time window (1802). At this time, after the sixth measurement opportunity (1804-6), the terminal detects an event, i.e., identifies at least one beam that satisfies the event. At this time, UE-BR may be triggered. Alternatively, UE-BR may be triggered later depending on the satisfaction of additional conditions. Below, the present disclosure describes various embodiments of UE-BR triggering.

[0242] The point at which UE-BR is triggered based on the triggering event condition can be determined in various ways.

[0243] [Triggering method #1] When the triggering event condition is satisfied during the quality measurement of the UE's beam, the UE-BR is triggered.

[0244] [Triggering Method #2] If a triggering event is satisfied K times for the same beam, UE-BR is triggered. Here, K can be set to a value greater than or equal to 2.

[0245] [Triggering Method #3] If the same beam satisfies the triggering event condition M times within the time window set by the base station, the UE-BR is triggered. Here, M can be set to a value greater than or equal to 1.

[0246] When triggering event #0 is combined with the triggering methods described above, the following actions are possible.

[0247] According to triggering method #1, the terminal measures the reference signals transmitted from the base station, and if a beam with better quality than the current beam is confirmed, the terminal performs UE-BR operation. At this time, the terminal may stop additional beam quality measurements, select beams based on information about the beams measured so far, and perform beam reporting. For example, in a case such as FIG. 18, measurements may not be performed in measurement opportunities (1804-7 to 1804-8) after the sixth measurement opportunity (1804-6). Alternatively, the terminal may perform all quality measurements for reference signals configured for beam quality measurement, select a beam, and perform beam reporting. For example, in a case such as FIG. 18, measurements may be performed in measurement opportunities (1804-7 to 1804-8) after the sixth measurement opportunity (1804-6).

[0248] According to triggering method #2, when K times have passed since the measured quality was better than the current beam for the same beam, the terminal performs UE-BR operation. For example, in a case such as FIG. 18, the UE-BR operation may not be performed immediately after the 6th measurement opportunity (1804-6), but may be performed after K+1 event detections. At this time, the terminal may stop additional beam quality measurements and perform beam reporting based on information about the beams measured so far. Alternatively, the terminal may perform all quality measurements for reference signals configured for beam quality measurements, select a beam, and perform beam reporting.

[0249] According to triggering method #3, if the same beam is measured M times as a beam with better quality than the current beam, the terminal can perform UE-BR operation. For example, in a case such as FIG. 18, the UE-BR operation may not be performed immediately after the 6th measurement opportunity (1804-6), but after M+1 event detections occur for the same beam, the UE-BR operation may be performed. At this time, the terminal may stop additional beam quality measurements and perform beam reporting based on information about the beams measured so far. Alternatively, the terminal may perform all quality measurements for the RSs configured for beam quality measurement, select beams, and perform beam reporting. Alternatively, the terminal may measure all reference signals within the configured time window and perform beam reporting based on the measured beam information.

[0250] After UE-BR is triggered according to the aforementioned method, the beam quality to be used to determine whether beam selection criteria such as beam selection condition #1, beam selection condition #2, or beam selection condition #3 are satisfied when selecting a beam for UE-BR can be determined in the following manner.

[0251] [Beam Quality Measurement Method #1] A method of selecting a beam based on preset beam selection condition(s) based on the beam quality value at a specific point in time can be applied. That is, a beam that satisfies the condition(s) once at a given point in time can be selected as the beam to be reported.

[0252] [Beam Quality Measurement Method #2] A method of selecting a beam based on preset beam selection condition(s) may be applied based on the average of quality values ​​for the same beam measured multiple times (e.g., 2) or more within a specific time interval. That is, a beam that satisfies the condition(s) on average within a given time interval may be selected as the beam to be reported.

[0253] When triggering event #0 and triggering method #1 are applied, beam quality measurement method #1 may be applied. In this case, UE-BR operation may be performed in response to a beam having better quality than the current beam among the measured beams. According to triggering method #1, the terminal may stop additional beam quality measurement and perform UE-BR by selecting a beam based on information about the beam(s) measured so far. Alternatively, the terminal may perform quality measurement for all reference signals set for beam quality measurement, select beams, and perform beam reporting. In this case, if quality measurement for the same beam is performed two or more times, UE-BR may be operated based on the most recently measured beam quality value. Alternatively, UE-BR may be operated based on the initially measured beam quality. Alternatively, UE-BR may be operated based on the highest or lowest measured beam quality value among the quality values ​​of the corresponding beam.

[0254] When beam quality measurement method #2 is applied, if the beam quality for the same beam is measured more than twice, the average value of the measured beam quality values ​​can be used for operation.

[0255] In the above example, UE-BR may be operated in a combination of beam quality measurement method #1 and beam quality measurement method #2. Specifically, some of the beams measured for UE-BR may be reported when measured once, and other parts may be reported when measured twice or more.

[0256]

[0257] When triggering event #0 and triggering method #2 are applied, or when triggering event #0 and triggering method #3 are applied, beam quality measurement method #1 may be applied. In this case, UE-BR operation may be performed at the time point when the Kth triggering event according to triggering method #2 or the Mth triggering event according to triggering method #3 for the same beam is satisfied.

[0258] For triggering method #2, UE-BR operation may be performed when K cases are detected in which a quality measurement is better than the current beam for the same specific beam. At that time, the terminal may stop additional beam quality measurement and perform UE-BR based on information about the beam measured so far. In this case, UE-BR may be performed based on beam information acquired at the time when the Kth triggering event according to triggering method #2 is satisfied. Alternatively, the terminal may perform quality measurement for all reference signals set for beam quality measurement, select beams, and perform beam reporting.

[0259] For triggering method #3, UE-BR operation may be performed in response to satisfying the triggering event condition M times within a time window set by the base station, i.e., in response to detecting M cases where a quality better than the current beam for the same specific beam is measured. At this time, the terminal may stop additional beam quality measurement and perform UE-BR based on the information about the beam measured so far. Alternatively, the terminal may perform quality measurement for all reference signals set for beam quality measurement, select beams, and perform beam reporting. Alternatively, the terminal may perform quality measurement for all reference signals within the set time window and perform beam reporting based on the measured beam information.

[0260] In the examples of triggering method #2 and triggering method #3, when beam quality measurement method #1 is applied, UE-BR may be operated based on the most recently measured beam quality value for beam(s) whose quality values ​​have been measured more than twice. Alternatively, UE-BR may be operated based on the initially measured beam quality. Alternatively, UE-BR may be operated based on the highest or lowest measured beam quality value among the quality values ​​of the corresponding beams within a set period or time window.

[0261] In the examples of triggering method #2 and triggering method #3, when beam quality measurement method #2 is applied, UE-BR can operate based on the average value of the measured beam quality values ​​for beam(s) whose quality values ​​are measured more than twice within a set period or time window.

[0262] In an example according to a triggering method and a beam quality measurement method using triggering event #0, if a beam selection condition is not configured, a beam can be configured to be selected in a specific manner. For example, when UE-BR is triggered, selection of N beams can be performed by selecting the best beams in order of the measured beam quality, including beams having better quality than the current beam. Alternatively, a method of operating to report only beams having better quality than the current beam is also possible. In this case, UE-BR can be operated in a manner of reporting a number of beam(s) less than N. In this case, the determination of beams better than the current beam can be based on a beam quality value at a specific point in time, as described above, or on an average value of quality values ​​measured multiple times (e.g., 2) or more within a set time interval or time window.

[0263] When the L1-RSRP metric is used for UE-BR performance, the beam quality value reported by the UE may include the L1-RSRP value for the beam selected for UE-BR or the average of L1-RSRP values ​​measured two or more times.

[0264]

[0265] According to the various embodiments described above, in UE-BR beam reporting, a differential L1-RSRP reporting format may be supported as an L1-RSRP reporting format. For example, the differential L1-RSRP reporting format may include items as shown in [Table 3] below.

[0266] CRI or SSBRI #1CRI or SSBRI #2...CRI or SSBRI #NL1-RSRP #1Differential L1-RSRP #2...Differential L1-RSRP #NDifferential L1-RSRP for current beam, if report mode that current beam is always reported is enabled by RRCNote: Other contents are not precluded

[0267] Referring to [Table 3], the differential L1-RSRP#2 to #N and the current beam are determined based on the difference between the measured L1-RSRP corresponding to CRI / SSBRI #2 to #N and the current beam and the measured L1-RSRP corresponding to CRI / SSBRI #1 (e.g., L1-RSRP #1). Here, L1-RSRP #1 is the largest RSRP among the reported L1-RSRPs and includes the absolute L1-RSRP. Additionally, in addition to the items listed in [Table x1], at least one of a reporting configuration ID, a synchronization status indication, an event ID, or a cell ID may be reported.

[0268] In one embodiment, in determining a triggering event, counting of event instance(s) is performed for each new beam. In addition, in counting the event instance(s), the counting value may be reset in the following cases. For example, the counting value may be reset when a reference signal reconfiguration / update or MAC-CE signaling for the corresponding beam is received. In another example, the counting value may be reset when a TCI state related to the corresponding beam is updated. In another example, the counting value may be reset when a UE-BR including a report for the corresponding beam is transmitted. In another example, the counting value may be reset when a network response is detected. In another example, the counting value may be reset when a time window expires. In another example, the counting value may be reset when a threshold for event evaluation is reconfigured by RRC signaling. As another example, the counting value may be reset if the RRC parameter(s) associated with the CSI reporting configuration for UE-BR are reconfigured.

[0269] In one embodiment, the following may be applied as an extension to the L1-RSRP reporting format. For example, for each reported CRI / SSBRI, a field may be added that indicates whether the CRI / SSBRI satisfies the conditions of a specific event. The addition of this indication may be enabled by RRC based on the capabilities of the terminal.

[0270]

[0271] The beam selection conditions, triggering method, beam quality measurement method, and additionally presented embodiments proposed in this disclosure can be applied simply or in a modified, expanded, or combined form according to the definition of each triggering event condition.

[0272]

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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 receiving configuration information including at least one of configuration for a triggering event for UE-BR (user equipment-initiated / event-driven beam report) or configuration for beam selection; A step of receiving at least one of the reference signals configured by the base station; A step of obtaining a quality value for at least one of the above reference signals; A step of determining whether to perform beam reporting based on the triggering event and the quality value for at least one of the above; A step of transmitting a report on selected beams based on the configuration for the above beam selection, The configuration for the above beam selection includes information about the number of beams to be reported, A method wherein the selected beams include at least one beam that satisfies the condition of the triggering event and at least one beam that does not satisfy the condition of the triggering event, as many as the number of beams.

2. In claim 1, A method wherein at least one beam that does not satisfy the condition of the triggering event comprises at least one beam selected in descending order of quality value from the beam having the largest quality value among the beams that do not satisfy the condition of the triggering event.

3. In claim 1, A method wherein at least one beam that does not satisfy the condition of the triggering event includes at least one beam having a quality value greater than that of the current beam among the beams that do not satisfy the condition of the triggering event.

4. In claim 1, A method in which predefined conditions are applied as selection conditions for reported beams when the configuration for the above beam selection is not signaled.

5. In claim 1, A method wherein the beam report includes information about one more number of beams than the number indicated by the configuration for beam selection, if the configuration for beam selection indicates that the current beam is to be reported.

6. In claim 1, The above report includes measurement values ​​for the selected beams, A method wherein at least one of the above measurement values ​​is expressed as a difference value compared to a measurement value of a reference beam.

7. In claim 6, A method wherein the reference beam includes a beam having the highest quality value among the measured beams.

8. In claim 1, A method wherein at least one of the above reference signals comprises at least one reference signal measured before the triggering event is satisfied.

9. In claim 1, A method further comprising the step of expiring a time window if it is determined that the triggering event is satisfied based on a measurement value for at least one of the above reference signals.

10. In claim 1, A method wherein at least one of the above reference signals comprises reference signals transmitted during a time window.

11. In claim 1, The above triggering event is configured to include detecting a configured number of event instances, A method wherein the beam report comprises an average of multiple quality values ​​per beam measured within a time window at multiple event instances.

12. In claim 1, The configuration for the above beam selection includes information on selection conditions for the beams being reported, A method wherein the above selection condition is configured to be determined based on at least one of the triggering event, terminal or time point.

13. In claim 1, The configuration for the above beam selection includes information on selection conditions for the beams being reported, A method wherein the beam selection condition includes one of: having a quality value greater than or equal to a first threshold; having a quality value whose difference from the maximum quality value is within a second threshold; or having a quality value whose difference from the quality value of the current beam is within a third threshold.

14. In claim 13, A method further comprising the step of receiving signaling for changing the first threshold, the second threshold, or the third threshold.

15. In claim 1, A method wherein the performance of the beam report is determined when one beam satisfies the triggering event once, when one beam satisfies the triggering event a specified number of times, or when one beam satisfies the triggering event a specified number of times during a time window.

16. In a method of operating a base station in a wireless communication system, A step of transmitting configuration information including at least one of configuration for a triggering event for UE-BR (user equipment-initiated / event-driven beam report) or configuration for beam selection; A step of transmitting reference signals configured by a base station; A step of receiving a report on selected beams based on a quality value for at least one of the reference signals, the triggering event, or the configuration for beam selection, The configuration for the above beam selection includes information about the number of beams to be reported, A method wherein the selected beams include at least one beam that satisfies the condition of the triggering event and at least one beam that does not satisfy the condition of the triggering event, as many as the number of beams.

17. In a wireless communication system, at a terminal, At least one transmitter / receiver; 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 receiving configuration information including at least one of configuration for a triggering event for UE-BR (user equipment-initiated / event-driven beam report) or configuration for beam selection; A step of receiving at least one of the reference signals configured by the base station; A step of obtaining a quality value for at least one of the above reference signals; A step of determining whether to perform beam reporting based on the triggering event and the quality value for at least one of the above; A step of transmitting a report on selected beams based on the configuration for the above beam selection, The configuration for the above beam selection includes information about the number of beams to be reported, A terminal in which the selected beams include at least one beam that satisfies the condition of the triggering event and at least one beam that does not satisfy the condition of the triggering event, as many as the number of beams.

18. In a base station in a wireless communication system, At least one transmitter / receiver; 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 transmitting configuration information including at least one of configuration for a triggering event for UE-BR (user equipment-initiated / event-driven beam report) or configuration for beam selection; A step of transmitting reference signals configured by a base station; A step of receiving a report on selected beams based on a quality value for at least one of the reference signals, the triggering event, or the configuration for beam selection, The configuration for the above beam selection includes information about the number of beams to be reported, A base station, wherein the selected beams include at least one beam that satisfies the condition of the triggering event and at least one beam that does not satisfy the condition of the triggering event, as many as the number of beams.

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