Method and apparatus for user equipment-initiated beam reporting operation

Abstract

A method of user equipment for an event-driven beam reporting operation comprises the steps of: determining a type of an event to be detected; determining a triggering condition of the event on the basis of the determined type; and if the event is detected on the basis of the determined triggering condition, transmitting, to a base station, a beam report according to the event, wherein the triggering condition of the event may include at least one threshold value and at least one hysteresis value.

Description

Method and device for terminal-driven beam reporting operation

[0001] The present invention relates to a beam management method in a mobile communication system, and more particularly, to a UE-initiated / event-driven beam reporting method and a device therefor.

[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, 3GPP (3 rd In Release-19 of the 5GPP, standardization of user equipment-initiated (UEI) / event-driven (ED) beam management is underway to resolve the problems of conventional network-driven beam management. Unlike conventional network-driven beam management, UE-initiated / event-driven beam management is a method in which UEs proactively perform beam management because they can recognize the current beam status and beam change trends relatively quickly compared to base stations. However, specific beam reporting operations for UE-initiated / event-driven beam management have not yet been defined.

[0005] The purpose of the present disclosure to solve the above problems is to provide a UE-initiated / event-driven beam reporting method and a device therefor.

[0006] A method of a terminal according to embodiments of the present disclosure for achieving the above object includes: a step of determining a type of an event to be detected; a step of determining a triggering condition of the event based on the determined type; and a step of transmitting a beam report according to the event to a base station when the event is detected based on the determined triggering condition, wherein the triggering condition of the event may include at least one threshold value and at least one hysteresis value.

[0007] The above detection target event is an event that is triggered when the quality of the current beam falls below a threshold value, and the triggering condition of the event can be determined according to the following mathematical formula.

[0008] [Mathematical formula]

[0009] Quality of the current beam + hysteresis < threshold

[0010] The above detection target event is an event that is triggered when the quality of at least one new beam becomes higher than the quality of the current beam by a threshold value, and the triggering condition of the event can be determined according to the following mathematical formula.

[0011] [Mathematical formula]

[0012] Quality of at least one new beam - hysteresis > Quality of the current beam + threshold

[0013] The above detection target event is an event that is triggered when the quality of at least one new beam is higher than a specific threshold value, and the triggering condition of the event can be determined according to the following mathematical formula.

[0014] [Mathematical formula]

[0015] Quality of at least one new beam - hysteresis > threshold

[0016] The event to be detected is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event can be determined according to the following mathematical formula.

[0017] [Mathematical formula]

[0018] Quality of the current beam + hysteresis < threshold_1

[0019] Quality of at least one new beam - hysteresis > threshold_2

[0020] The event to be detected is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event can be determined according to the following mathematical formula.

[0021] [Mathematical formula]

[0022] Quality of the current beam + hysteresis_1 < threshold_1

[0023] Quality of at least one new beam - hysteresis_2 > threshold_2

[0024] The at least one hysteresis value may be determined based on the speed of the terminal, whether the terminal is rotating, whether blockage occurs for the terminal, and / or the position of the terminal.

[0025] The method further includes a step of receiving setting information on triggering conditions for each event type from the base station, and the triggering conditions of the event can be determined based on the setting information.

[0026] A method of a base station according to embodiments of the present disclosure for achieving the above object includes: transmitting setting information on triggering conditions for each event type to a terminal; and receiving a beam report according to the detected event from the terminal based on the triggering condition of the event to be detected, which is determined based on the setting information, wherein the triggering condition of the event may include at least one threshold value and at least one hysteresis value.

[0027] The above detection target event is an event that is triggered when the quality of the current beam falls below a threshold value, and the triggering condition of the event can be determined according to the following mathematical formula.

[0028] [Mathematical formula]

[0029] Quality of the current beam + hysteresis < threshold

[0030] The above detection target event is an event that is triggered when the quality of at least one new beam becomes higher than the quality of the current beam by a threshold value, and the triggering condition of the event can be determined according to the following mathematical formula.

[0031] [Mathematical formula]

[0032] Quality of at least one new beam - hysteresis > Quality of the current beam + threshold

[0033] The above detection target event is an event that is triggered when the quality of at least one new beam is higher than a specific threshold value, and the triggering condition of the event can be determined according to the following mathematical formula.

[0034] [Mathematical formula]

[0035] Quality of at least one new beam - hysteresis > threshold

[0036] The event to be detected is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event can be determined according to the following mathematical formula.

[0037] [Mathematical formula]

[0038] Quality of the current beam + hysteresis < threshold_1

[0039] Quality of at least one new beam - hysteresis > threshold_2

[0040] The event to be detected is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event can be determined according to the following mathematical formula.

[0041] [Mathematical formula]

[0042] Quality of the current beam + hysteresis_1 < threshold_1

[0043] Quality of at least one new beam - hysteresis_2 > threshold_2

[0044] The at least one hysteresis value may be determined based on the speed of the terminal, whether the terminal is rotating, whether blockage occurs for the terminal, and / or the position of the terminal.

[0045] According to embodiments of the present disclosure for achieving the above object, a terminal includes: at least one processor, wherein the at least one processor causes the terminal to perform: a step of determining a type of an event to be detected; a step of determining a triggering condition of the event based on the determined type; and a step of transmitting a beam report according to the event to a base station when the event is detected based on the determined triggering condition, wherein the triggering condition of the event may include at least one threshold value and at least one hysteresis value.

[0046] The at least one hysteresis value may be determined based on the speed of the terminal, whether the terminal is rotating, whether blockage occurs for the terminal, and / or the position of the terminal.

[0047] The at least one processor may further perform a step of: receiving setting information on triggering conditions for each event type from the base station, and the triggering conditions of the event may be determined based on the setting information.

[0048] Embodiments of the present invention allow for event triggering conditions to be changed based on the terminal's status, terminal operation, and / or terminal environment when performing terminal-driven / event-driven beam reporting operations. This prevents situations where specific events are detected continuously or periodically over a short period of time, resulting in continuous or periodic beam reporting, thereby improving overall system performance.

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

[0050] Figure 2 is a block diagram illustrating a first embodiment of a communication node constituting a communication system.

[0051] Figure 3 is a block diagram illustrating a first embodiment of communication nodes performing communication.

[0052] Figure 4a is a block diagram illustrating a first embodiment of a transmission path.

[0053] Figure 4b is a block diagram illustrating a first embodiment of a receiving path.

[0054] Figure 5 is a conceptual diagram illustrating a first embodiment of a system frame in a communication system.

[0055] Figure 6 is a conceptual diagram illustrating a first embodiment of a subframe in a communication system.

[0056] Figure 7 is a conceptual diagram illustrating a first embodiment of a slot in a communication system.

[0057] Figure 8 is a conceptual diagram illustrating a first embodiment of time-frequency resources in a communication system.

[0058] Figure 9 is a flowchart for explaining Mode A operation to which embodiments of the present invention are applied.

[0059] Figure 10 is a flowchart for explaining Mode B operation to which embodiments of the present invention are applied.

[0060] FIG. 11 is a flowchart illustrating a terminal-led / event-based beam reporting method according to embodiments of the present invention.

[0061] 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.

[0062] 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.

[0063] 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.”

[0064] 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.”

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In the present disclosure, signaling may be at least one of upper layer signaling, MAC signaling, or PHY (physical) signaling. A message used for upper layer signaling may be referred to as an "upper layer message" or an "upper layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Upper layer signaling may refer to a transmission and reception operation of system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to a transmission and reception operation of a MAC control element (CE). PHY signaling may refer to a transmission and reception operation of control information (e.g., downlink control information (DCI), uplink control information (UCI), sidelink control information (SCI)).

[0072] 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.”

[0073] The communication network to which the embodiment is applied is not limited to what is described below, and the embodiment may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the communication network may be used in the same sense as the communication system.

[0074] Figure 1 is a conceptual diagram illustrating a first embodiment of a communication system.

[0075] 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.

[0076] A plurality of communication nodes (110 to 130) can support a communication protocol (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.) specified in the 3GPP (3rd generation partnership project) standard. The plurality of communication nodes (110 to 130) may support CDMA (code division multiple access) technology, WCDMA (wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (non-orthogonal multiple access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (space division multiple access) technology, etc. Each of the plurality of communication nodes may have the following structure.

[0077] Figure 2 is a block diagram illustrating a first embodiment of a communication node constituting a communication system.

[0078] Referring to FIG. 2, a communication node (200) may include at least one processor (210), a memory (220), and a transmission / reception device (230) that is connected to a network and performs communication. In addition, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) and communicate with each other.

[0079] The processor (210) can execute program commands stored in at least one of the memory (220) and the storage device (260). The processor (210) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which the methods according to embodiments of the present disclosure are performed. Each of the memory (220) and the storage device (260) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0080] 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).

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] Meanwhile, communication nodes performing communication in a communication network may be configured as follows. The communication node illustrated in Fig. 3 may be a specific embodiment of the communication node illustrated in Fig. 2.

[0087] Figure 3 is a block diagram illustrating a first embodiment of communication nodes performing communication.

[0088] Referring to FIG. 3, each of the first communication node (300a) and the second communication node (300b) may be a base station or a UE. The first communication node (300a) may transmit a signal to the second communication node (300b). The transmission processor (311) included in the first communication node (300a) may receive data (e.g., a data unit) from a data source (310). The transmission processor (311) may receive control information from the controller (316). The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0089] 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.

[0090] 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).

[0091] Signals transmitted by the first communication node (300a) may be received by antennas (364a to 364r) of the second communication node (300b). Signals received by the antennas (364a to 364r) may be provided to demodulators (DEMODs) included in transceivers (363a to 363r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (362) may perform a MIMO detection operation on the symbols. The receiving processor (361) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (361) may be provided to a data sink (360) and a controller (366). For example, data may be provided to the data sink (360), and control information may be provided to the controller (366).

[0092] Meanwhile, the second communication node (300b) can transmit a signal to the first communication node (300a). The transmitting processor (368) included in the second communication node (300b) can receive data (e.g., data units) from a data source (367) and perform a processing operation on the data to generate data symbol(s). The transmitting processor (368) can receive control information from the controller (366) and perform a processing operation on the control information to generate control symbol(s). In addition, the transmitting processor (368) can perform a processing operation on a reference signal to generate reference symbol(s).

[0093] 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).

[0094] Signals transmitted by the second communication node (300b) may be received by the antennas (314a to 314r) of the first communication node (300a). The signals received by the antennas (314a to 314r) may be provided to demodulators (DEMODs) included in the transceivers (313a to 313r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (320) may perform a MIMO detection operation on the symbols. The receiving processor (319) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (319) may be provided to a data sink (318) and a controller (316). For example, data may be provided to the data sink (318) and control information may be provided to the controller (316).

[0095] 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.

[0096] FIG. 4a is a block diagram illustrating a first embodiment of a transmission path, and FIG. 4b is a block diagram illustrating a first embodiment of a reception path.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] Figure 5 is a conceptual diagram illustrating a first embodiment of a system frame in a communication system.

[0104] Referring to FIG. 5, time resources in a communication system can be divided into frame units. For example, system frames can be set consecutively in the time domain of the communication system. The length of a system frame can be 10 ms (milliseconds). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0105] 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."

[0106] Figure 6 is a conceptual diagram illustrating a first embodiment of a subframe in a communication system.

[0107] Referring to FIG. 6, one subframe may include n slots, where n may be a natural number. Accordingly, one subframe may be composed of one or more slots.

[0108] Figure 7 is a conceptual diagram illustrating a first embodiment of a slot in a communication system.

[0109] 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.

[0110] 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 a first 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.

[0111] Subcarrier spacing 15kHz 30kHz 60kHz 120kHz 240kHz 480kHz 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

[0112]

[0113] 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.

[0114] 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.

[0115] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting solely of DL symbols may be referred to as a "DL slot," a slot consisting solely of FL symbols may be referred to as an "FL slot," and a slot consisting solely of UL symbols may be referred to as a "UL slot."

[0116] 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.

[0117] 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, a control channel may mean a PDCCH, a PUCCH, or a PSCCH, and a data channel may mean a PDSCH, a PUSCH, or a PSSCH.

[0118] Figure 8 is a conceptual diagram illustrating a first embodiment of time-frequency resources in a communication system.

[0119] Referring to FIG. 8, a resource consisting of one symbol (e.g., an OFDM symbol) in the time domain and one subcarrier in the frequency domain may be defined as a "RE (resource element)". Resources consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain may be defined as a "REG (resource element group)". A REG may include K REs. A REG may be used as a basic unit for resource allocation in the frequency domain. K may be a natural number. For example, K may be 12. N may be a natural number. In the slot illustrated in FIG. 7, N may be 14. N OFDM symbols may be used as a basic unit for resource allocation in the time domain.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH occasion information, etc. The PDCCH DMRS may be a DMRS used to demodulate the PDCCH. The PDCCH occasion may be a region where the PDCCH can exist. That is, the PDCCH occasion may be a region where DCI can be transmitted. The PDCCH occasion may be referred to as a PDCCH candidate. The PDCCH occasion information may include time resource information and frequency resource information of the PDCCH occasion. In the time domain, the length of the PDCCH occasion may be indicated in symbol units. In the frequency domain, the size of the PDCCH occasion may be indicated in RB units (e.g., in PRB (physical resource block) units or CRB (common resource block) units).

[0124] The search space information may include a coreset identifier (ID) associated with the search space, a period of PDCCH monitoring, and / or an offset. The period and offset of PDCCH monitoring may each be indicated on a slot-by-slot basis. In addition, the search space information may further include an index of the symbol at which the PDCCH monitoring operation begins.

[0125] 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).

[0126]

[0127] Discussions are underway to improve intra-cell and inter-cell beam management, based on the work item description (WID) for 3GPP Rel-19 NR MIMO discussions. These improvements primarily target FR2 bands and single transmission / reception point (sTRP) scenarios, leveraging existing legacy CSI measurement and reporting configuration procedures while reducing overhead and latency.

[0128] To this end, UE-initiated (UEI) / event-driven (ED) beam management procedures are being discussed. The beam management methods defined up to Rel-18 were network-based. In other words, in network-initiated beam management, the network (i.e., the base station) can instruct the terminal to switch to a specific beam for DL ​​reception or UL transmission. In this case, the base station receives a measurement report from the terminal and issues an instruction based on the measurement report, so the base station cannot determine the optimal beam until it receives the measurement report transmitted by the terminal.

[0129] If the beam management operation is initiated from the terminal side, which can first detect the change in the beam, the delay time (e.g., the time required for the base station to instruct the terminal to perform a measurement report and to receive the measurement report from the terminal based on the instruction) and signal overhead (e.g., the overhead of the signal from the network to instruct the terminal to perform a measurement report) can be reduced compared to the network-based beam management operation.

[0130]

[0131] Meanwhile, at the 3GPP RAN 1 meetings (RAN #116 and RAN #116-bis), outline beam report transmission procedures for UEI / ED beam reporting were approved.

[0132] First, the beam report transmission procedure is largely divided into Mode A and Mode B, and the outline of the procedure for each mode is as follows.

[0133] First, Mode A is a method of dynamically scheduling uplink control information (UCI) for beam reporting by the base station, and can be performed in the following three steps.

[0134] Step 1: The terminal may transmit the first UL channel requesting resources for the second UL channel for transmitting the beam report. The first UL channel consists of a PUCCH (i.e., the first PUCCH) containing single-bit information or multi-bit information, and the PUCCH may follow the existing SR (scheduling request) type or the new UCI type.

[0135] Step 2: The terminal can detect the DCI format indicating the resources of the second UL channel. In this case, no new DCI format is introduced.

[0136] Step 3: The terminal can transmit a beam report on a second UL channel. In this case, the second UL channel can be PUCCH, PUSCH, or both.

[0137] Mode A is a basic function of the terminal, and all terminals that support UEI / ED beam reporting must support this function.

[0138] Meanwhile, Mode B is a method of transmitting UCI on pre-configured resources for the second UL channel, and can be performed in the following two-step operation.

[0139] Step 1: The UE may transmit a first UL channel notifying that a beam report will be transmitted on a second UL channel. The first UL channel consists of a PUCCH (i.e., the first PUCCH) containing single-bit information or multi-bit information, and the PUCCH may follow the existing SR (scheduling request) type or the new UCI type.

[0140] Step 2: The terminal can transmit a beam report on a second UL channel. As in Mode A, the second UL channel can be PUCCH, PUSCH, or both.

[0141] In Mode B, the notification in step 1 and the beam report in step 2 are transmitted as separate reporting instances, and it is not determined whether the terminal receives confirmation information in response to each step in Mode A and Mode B.

[0142] Additionally, cross-CC (component carrier) beam reporting can be supported in both Mode A and Mode B in the above procedures.

[0143]

[0144] As described above, for UEI / ED beam reporting operation, all modes require a process (Step 1) in which information is first transmitted from the terminal to the base station. In Mode A, where resources for beam reporting are not pre-allocated, the terminal can request resources for beam reporting from the base station. In Mode B, where resources for beam reporting are pre-allocated, the terminal can notify the base station that it will use the pre-allocated resources for beam reporting.

[0145]

[0146] Figure 9 is a flowchart for explaining Mode A operation to which embodiments of the present invention are applied.

[0147] Referring to FIG. 9, a terminal may detect at least one event (S910). In this case, the terminal may detect at least one event among the previously described event(s) (e.g., Event-1 to Event-9). If at least one event is detected, the terminal requests resources for beam reporting through a first UL channel (i.e., first PUCCH) (S920), and a base station that receives the first UL channel may indicate resources of a second UL channel to be used by the terminal to transmit the beam report through DCI (S930). Thereafter, the terminal may transmit the second UL channel including the beam report by utilizing the corresponding resources (S940).

[0148] Figure 10 is a flowchart for explaining Mode B operation to which embodiments of the present invention are applied.

[0149] Referring to FIG. 10, a terminal may detect at least one event (S1010). In this case, the terminal may detect at least one event among the previously described event(s) (e.g., Event-1 to Event-9). If at least one event is detected, the terminal may notify the base station that it will transmit second UL channel(s) using preset resources via the first UL channel (i.e., the first PUCCH) (S1020). Thereafter, the terminal may transmit the second UL channel(s) including a beam report to the base station using the preset resources (S1040).

[0150] In this case, the terminal may transmit the second UL channel(s) after receiving an acknowledgement message (e.g., an ACK (acknowledgement) message or a notification message consisting of a 1-bit indicator) (i.e., S1330 of FIG. 13) indicating that the first PUCCH has been received from the base station. Alternatively, the terminal may transmit the second UL channel(s) in a slot or symbol after a predetermined offset from a time point associated with transmission of the first PUCCH (e.g., a slot or symbol in which the first PUCCH (e.g., the last symbol constituting the first PUCCH) is transmitted) without receiving an acknowledgement message for the first PUCCH from the base station. For example, if it is not confirmed that the first PUCCH has not been normally received by the base station until the predetermined offset has elapsed from the time point associated with transmission of the first PUCCH, the terminal may transmit the second UL channel(s) in a slot or symbol after a predetermined offset from the time point associated with transmission of the first PUCCH. In this case, the offset may be set from the base station to the terminal in symbol, subslot, slot, subframe, or absolute time units, or may be predefined in the technical specifications. Meanwhile, since there may be cases where the terminal does not receive the acknowledgement message even though the base station has transmitted the acknowledgement message, the base station may transmit the acknowledgement message more than once.

[0151]

[0152] Meanwhile, the following events are being discussed as events that trigger the above-described UEI / ED beam report.

[0153] -Event-1: The quality of the current beam (e.g. L1-RSRP, etc.) falls below a certain threshold.

[0154] -Event-2: The quality of at least one new beam is improved by a threshold amount compared to the current beam.

[0155] -Event-3: The quality of the new beam exceeds a certain threshold.

[0156] -Event-4: The quality of the current beam becomes lower than threshold 1, and the quality of at least one new beam becomes higher than threshold 2.

[0157] -Event-5: The absolute value of the difference between the quality of the current beam and the quality of at least one new beam becomes less than a certain threshold.

[0158] -Event-6: The current beam is not included in the top K(>1) beams configured for measurement and reporting.

[0159] -Event-7a: The quality of at least one new beam (e.g. L1-RSRP) improves by a certain threshold compared to the quality derived from the lowest quality RS among the active TCI states.

[0160] -Event-7b: The quality of at least one new beam (e.g. L1-RSRP) improves by a certain threshold compared to the quality derived from the highest quality RS among the active TCI states.

[0161] -Event-8: The quality of M(>1) new beams (e.g. L1-RSRP) is improved by a certain threshold compared to the current beam.

[0162] -Event-9: The quality of at least one new beam (e.g. L1-RSRP) is improved by a certain threshold compared to the configured reference RS (possibly SSB or CSI-RS).

[0163]

[0164] For terminal-driven beam reporting, the conditions for triggering events need to be more clearly defined. Certain events may be detected repeatedly and frequently over a short period of time, depending on the terminal's current status or the channel conditions between the base station and the terminal. In such cases, the terminal may perform frequent beam reporting whenever an event is detected, increasing overhead. Furthermore, situations may arise where the terminal or base station performs unnecessary and frequent beam switching procedures.

[0165] Therefore, in order to prevent a situation in which events are continuously or periodically detected for a short period of time in a specific environment, resulting in beam reporting being performed continuously or periodically, the application of specific parameter values ​​(e.g., hysteresis values ​​or offset values, etc.) may be considered when defining the triggering conditions of an event. These parameter values ​​may be added to, deleted from, or changed from the triggering conditions of an event depending on specific conditions (e.g., event type, etc.).

[0166] Below, a method for improving event triggering conditions for each event type is described according to embodiments of the present invention.

[0167]

[0168] Event-1

[0169] Event-1 is an event triggered when the quality of the current beam (e.g., L1-RSRP, etc.) falls below a certain threshold. Specifically, Event-1 may be triggered when the condition of the following mathematical expression 1 is satisfied. In mathematical expression 1, the quality and / or threshold of the current beam may be L1-RSRP, L1-RSRQ, and / or L1-SINR, etc.

[0170]

[0171]

[0172] Meanwhile, the triggering condition of event-1 according to one embodiment of the present invention may additionally include a hysteresis value as in mathematical expression 2.

[0173]

[0174]

[0175] In the above mathematical expression 2, the hysteresis value can be added, deleted, or changed according to specific conditions. Here, the specific conditions may be related to an operation related to the terminal (e.g., the speed of the terminal, whether the terminal is rotating, or whether blockage occurs for the terminal) or the surrounding environment of the terminal (e.g., whether the terminal is located in a specific geographical location).

[0176] For example, if the speed of the terminal is greater than a (pre-)configured specific value, a hysteresis value may be added to Equation 2. Additionally or alternatively, the hysteresis value may be changed depending on the absolute value (V) of the speed of the terminal. For example, if the speed (V) of the terminal is V_1 < V < V_2, a first hysteresis value (hys_1) may be used, and if the speed (V) of the terminal is V_2 < V < V_3, a second hysteresis value (hys_2) may be used. Here, parameters such as the first hysteresis value and the second hysteresis value may be transmitted to the terminal through upper layer signaling (e.g., in the form of a table). Alternatively, the parameters may be predefined in a technical specification.

[0177] Similarly, the hysteresis value can be adjusted depending on whether the terminal is rotating. For example, if the antenna orientation changes rapidly as the terminal rotates, signal quality (QoS) variability may increase, so applying a hysteresis value (or applying a higher hysteresis value) can reduce the frequency of unnecessary handovers or measurement events. Conversely, if the terminal rotates little or maintains a stable orientation, the hysteresis value can be set to not be applied (or a lower hysteresis value) to enable more sensitive triggering.

[0178] Additionally, the hysteresis value can be adjusted depending on whether a terminal experiences blockage. For example, if a terminal experiences signal blockage due to a building, vehicle, or other obstacle, temporary signal attenuation may potentially lead to unnecessary handovers or link reconfigurations. To prevent this, the hysteresis value can be applied (or a higher hysteresis value applied) when a blockage is detected, thereby ignoring temporary signal changes. Conversely, in environments where blockage occurs persistently (e.g., inside a tunnel or in a high-density urban environment), the hysteresis value can be dynamically adjusted to induce more appropriate handovers or reconfigurations.

[0179] Meanwhile, the event triggering condition of the above mathematical expression 2 can be transformed into the release condition of event-2 as shown in the following mathematical expression 3.

[0180]

[0181]

[0182] The conditions for adding / deleting / changing the hysteresis value described with reference to mathematical expression 2 above can be similarly applied to the hysteresis value of mathematical expression 3.

[0183]

[0184] Event-2

[0185] Event-2 may be triggered when the quality of at least one new beam becomes higher than the quality of the current beam by a certain threshold value. Specifically, Event-2 may be triggered when the condition of Equation 4 below is satisfied. In Equation 4, the quality and the threshold value of the current beam and / or the new beam may be L1-RSRP, L1-RSRQ, and / or L1-SINR.

[0186]

[0187]

[0188] The triggering condition of event-2 according to one embodiment of the present invention may additionally include a hysteresis value as in mathematical expression 5.

[0189]

[0190]

[0191] In Equation 5, the hysteresis value can be added, deleted, or changed based on specific conditions. Here, the specific conditions may be related to operations related to the terminal (e.g., the terminal's speed, whether the terminal is rotating, or whether blockage occurs for the terminal) or the surrounding environment of the terminal (e.g., whether the terminal is located in a specific geographical location).

[0192] For example, if the speed of the terminal is greater than a (pre-)configured specific value, a hysteresis value may be added to Equation 5. Additionally or alternatively, the hysteresis value may be changed depending on the absolute speed (V) of the terminal. For example, if the speed (V) of the terminal is V_1 < V < V_2, the first hysteresis value (hys_1) may be used, and if the speed (V) of the terminal is V_2 < V < V_3, the second hysteresis value (hys_2) may be used. Here, parameters such as the first hysteresis value and the second hysteresis value may be transmitted to the terminal through upper layer signaling (table format).

[0193] Similarly, the hysteresis value can be adjusted depending on whether the terminal is rotating. For example, if the antenna orientation changes rapidly as the terminal rotates, signal quality (QoS) variability may increase, so applying a hysteresis value (or applying a higher hysteresis value) can reduce the frequency of unnecessary handovers or measurement events. Conversely, if the terminal rotates little or maintains a stable orientation, the hysteresis value can be set to not be applied (or a lower hysteresis value) to enable more sensitive triggering.

[0194] Additionally, the hysteresis value can be adjusted depending on whether a terminal experiences blockage. For example, if a terminal experiences signal blockage due to a building, vehicle, or other obstacle, temporary signal attenuation may potentially lead to unnecessary handovers or link reconfigurations. To prevent this, the hysteresis value can be applied (or a higher hysteresis value applied) when a blockage is detected, thereby ignoring temporary signal changes. Conversely, in environments where blockage occurs persistently (e.g., inside a tunnel or in a high-density urban environment), the hysteresis value can be dynamically adjusted to induce more appropriate handovers or reconfigurations.

[0195] Additionally, to prevent frequent beam reporting and increased overhead, the triggering condition of Event-2 may be changed to Equation 6 so that Event-2 is triggered when the quality of at least N new beams is higher than the quality of the current beam by a certain threshold. In this case, the hysteresis value may not be applied.

[0196]

[0197]

[0198] Meanwhile, the release condition of Event-2 can be defined as in Mathematical Expression 7 or Mathematical Expression 8 below.

[0199]

[0200]

[0201]

[0202] The conditions for adding / deleting / changing the hysteresis value described with reference to mathematical expression 5 above can be similarly applied to the hysteresis values ​​of mathematical expressions 7 and 8.

[0203] In addition, the conditions for adding / deleting / changing the above hysteresis value can be similarly applied when setting a specific threshold value as well as the triggering condition of Event-2.

[0204]

[0205] Event-3

[0206] Event-3 may be triggered when the quality of at least one new beam is greater than a certain threshold value. Specifically, Event-3 may be triggered when the condition of Equation 9 below is satisfied. In Equation 9, the quality and threshold value of the new beam may be L1-RSRP, L1-RSRQ, and / or L1-SINR.

[0207]

[0208]

[0209] The triggering condition of event-3 according to one embodiment of the present invention may additionally include a hysteresis value as in mathematical expression 10.

[0210]

[0211]

[0212] In Equation 10, the hysteresis value can be added, deleted, or changed based on specific conditions. Here, the specific conditions may be related to operations related to the terminal (e.g., the terminal's speed, whether the terminal is rotating, or whether blockage occurs for the terminal) or the surrounding environment of the terminal (e.g., whether the terminal is located in a specific geographical location).

[0213] For example, if the speed of the terminal is greater than a (pre-)configured specific value, a hysteresis value may be added to Equation 10. Additionally or alternatively, the hysteresis value may be changed depending on the absolute speed (V) of the terminal. For example, if the speed (V) of the terminal is V_1 < V < V_2, the first hysteresis value (hys_1) may be used, and if the speed (V) of the terminal is V_2 < V < V_3, the second hysteresis value (hys_2) may be used. Here, parameters such as the first hysteresis value and the second hysteresis value may be transmitted to the terminal through upper layer signaling (table format).

[0214] Similarly, the hysteresis value can be adjusted depending on whether the terminal is rotating. For example, if the antenna orientation changes rapidly as the terminal rotates, signal quality (QoS) variability may increase, so applying a hysteresis value (or applying a higher hysteresis value) can reduce the frequency of unnecessary handovers or measurement events. Conversely, if the terminal rotates little or maintains a stable orientation, the hysteresis value can be set to not be applied (or a lower hysteresis value) to enable more sensitive triggering.

[0215] Additionally, the hysteresis value can be adjusted depending on whether a terminal experiences blockage. For example, if a terminal experiences signal blockage due to a building, vehicle, or other obstacle, temporary signal attenuation may potentially lead to unnecessary handovers or link reconfigurations. To prevent this, the hysteresis value can be applied (or a higher hysteresis value applied) when a blockage is detected, thereby ignoring temporary signal changes. Conversely, in environments where blockage occurs persistently (e.g., inside a tunnel or in a high-density urban environment), the hysteresis value can be dynamically adjusted to induce more appropriate handovers or reconfigurations.

[0216] Additionally, to prevent frequent beam reporting from increasing overhead, the triggering condition of Event-3 can be changed to Equation 11 so that Event-3 is triggered when the quality of at least N new beams is above a certain threshold. In this case, the hysteresis value may not be applied.

[0217]

[0218]

[0219] Meanwhile, the release condition of Event-3 can be defined as in Mathematical Expression 12 or Mathematical Expression 13 below.

[0220]

[0221]

[0222]

[0223] The conditions for adding / deleting / changing the hysteresis value described with reference to Equation 10 above can be similarly applied to the hysteresis values ​​of Equations 12 and 13.

[0224] In addition, the conditions for adding / deleting / changing the above hysteresis value can be similarly applied not only to the triggering conditions of Event-3 but also when setting a specific threshold value.

[0225]

[0226] Event-4

[0227] Event-4 may be triggered when the quality of the current beam is below a specific threshold value (threshold_1) and at the same time, the quality of at least one new beam is above a specific threshold value (threshold_2). Specifically, Event-4 may be triggered when all of the conditions of Equation 14 below are satisfied. In Equation 14, the quality and threshold of the current beam and the new beam may be L1-RSRP, L1-RSRQ, and / or L1-SINR.

[0228]

[0229]

[0230]

[0231] The triggering condition of event-4 according to one embodiment of the present invention may additionally include a hysteresis value as in mathematical expression 15.

[0232]

[0233]

[0234]

[0235] In Equation 15, the hysteresis value can be added, deleted, or changed based on specific conditions. Here, the specific conditions may be related to operations related to the terminal (e.g., the terminal's speed, whether the terminal is rotating, or whether blockage occurs for the terminal) or the surrounding environment of the terminal (e.g., whether the terminal is located in a specific geographical location).

[0236] For example, if the speed of the terminal is greater than a (pre-)configured specific value, a hysteresis value may be added to Equations 16 and 17. Additionally or alternatively, the hysteresis value may be changed depending on the absolute speed (V) of the terminal. For example, if the speed (V) of the terminal is V_1 < V < V_2, the first hysteresis value (hys_1) may be used, and if the speed (V) of the terminal is V_2 < V < V_3, the second hysteresis value (hys_2) may be used. Here, parameters such as the first hysteresis value and the second hysteresis value may be transmitted to the terminal through upper layer signaling (table format).

[0237] Similarly, the hysteresis value can be adjusted depending on whether the terminal is rotating. For example, if the antenna orientation changes rapidly as the terminal rotates, signal quality (QoS) variability may increase, so applying a hysteresis value (or applying a higher hysteresis value) can reduce the frequency of unnecessary handovers or measurement events. Conversely, if the terminal rotates little or maintains a stable orientation, the hysteresis value can be set to not be applied (or a lower hysteresis value) to enable more sensitive triggering.

[0238] Additionally, the hysteresis value can be adjusted depending on whether a terminal experiences blockage. For example, if a terminal experiences signal blockage due to a building, vehicle, or other obstacle, temporary signal attenuation may potentially lead to unnecessary handovers or link reconfigurations. To prevent this, the hysteresis value can be applied (or a higher hysteresis value applied) when a blockage is detected, thereby ignoring temporary signal changes. Conversely, in environments where blockage occurs persistently (e.g., inside a tunnel or in a high-density urban environment), the hysteresis value can be dynamically adjusted to induce more appropriate handovers or reconfigurations.

[0239] Additionally, depending on specific conditions, the hysteresis value can be applied only to the quality of the current beam or the new beam, and different hysteresis values ​​can be applied to the current beam and the new beam. In such cases, the triggering condition for Event-4 can be changed as shown in Equation 16.

[0240]

[0241]

[0242]

[0243] Additionally, to prevent frequent beam reporting and increased overhead, the triggering condition of Event-4 can be changed to Equation 17 so that Event-4 is triggered when the quality of at least N new beams is higher than the quality of the current beam by a certain threshold. In this case, the hysteresis value may not be applied.

[0244]

[0245]

[0246]

[0247] Meanwhile, the release condition of Event-4 can be defined as in Mathematical Expression 18 or Mathematical Expression 19 below.

[0248]

[0249]

[0250]

[0251]

[0252]

[0253] The conditions for adding / deleting / changing the hysteresis value described with reference to Equation 15 above can be similarly applied to the hysteresis values ​​of Equations 18 and 19.

[0254] Additionally, the threshold_1 value (or threshold_2 value) may be used as a reference when determining a specific threshold value. For example, the threshold_2 value may be determined based on the threshold_1 value, which may be expressed as in mathematical expression 20.

[0255]

[0256]

[0257] Alternatively, the threshold_1 value can be determined based on the threshold_2 value, which can be expressed as in mathematical expression 21.

[0258]

[0259]

[0260] FIG. 11 is a flowchart illustrating a terminal-led / event-based beam reporting method according to embodiments of the present invention.

[0261] Referring to FIG. 11, a terminal (UE) may receive triggering condition setting information from a base station (NW) (S1101). The triggering condition setting information may include information on event triggering conditions for each event type. For example, the triggering condition setting information may include information on triggering conditions for the aforementioned Event-1, Event-2, Event-3, and / or Event-4 and other event types. For example, the triggering condition setting information may include whether to apply hysteresis value(s), hysteresis value(s), whether to apply threshold(s), and / or threshold(s) for the triggering conditions of each event type. Additionally or alternatively, the triggering condition setting information may include information on whether the hysteresis value(s) and / or threshold(s) included in the triggering condition of each event type are applied according to the state or operation of the terminal (e.g., the speed of the terminal, whether the terminal is rotating, whether blockage occurs for the terminal) and / or the environment of the terminal (e.g., the location of the terminal). Additionally or alternatively, the triggering condition setting information may include information on changes in the hysteresis value(s) and / or threshold(s) according to the state or operation of the terminal and / or the environment of the terminal. Meanwhile, the step (S1101) of receiving the triggering condition setting information may be optionally performed. That is, the information included in the triggering setting information may be predefined by a technical specification or may be pre-set in the terminal.

[0262] The terminal can determine the triggering conditions for the event based on the type of event being detected (S1110). At this time, the triggering conditions for the event may be determined based on the triggering configuration information and / or the terminal's status or operation and / or the terminal's environment. Alternatively, if the triggering configuration information is not received, the triggering conditions for the event may be determined based on information predefined in the technical specifications or information pre-configured in the terminal.

[0263] The terminal can detect an event based on determined event triggering conditions (S1120), and information such as the detected event and measurement results based on the event can be transmitted to the base station via a beam report (S1130). The beam report can be performed via Mode A operation or Mode B operation described with reference to FIGS. 9 and 10.

[0264] Meanwhile, after transmitting the beam report of the terminal, the event triggering conditions can be updated to reflect the updated status or operation of the terminal and / or the updated environment of the terminal (S1140). That is, the event triggering conditions can be dynamically updated to reflect the current status / operation / environment of the terminal. Subsequent event detection and beam reporting operations can be performed according to the updated event triggering conditions.

[0265]

[0266] In the above embodiments, parameter values ​​(e.g., hysteresis values ​​and / or threshold values) may vary in their application or magnitude depending on the type of event. Therefore, when an event occurs, it may be necessary to identify the event. To this end, the terminal may explicitly or implicitly transmit event identification information, such as an event ID, to the base station.

[0267] In the above embodiments, parameter values ​​(e.g., hysteresis values ​​and / or threshold values, etc.) may be (pre-)set, and applying (or not applying) the corresponding parameter values ​​may be the default operation. Meanwhile, whether or not to apply the corresponding parameter values ​​may be signaled from the base station (or from the terminal) to the terminal (or to the base station). In this case, the signaling may be RRC signaling, MAC CE signaling, and / or PHY layer signaling.

[0268] In the above embodiments, the parameter values ​​(e.g., hysteresis values ​​and / or threshold values), event identification information, and / or whether the parameter values ​​are applied may be determined depending on an operation related to the terminal (e.g., the speed of the terminal, whether the terminal is rotating, and / or whether a blockage occurs for the terminal) or an ambient environmental condition (e.g., a specific geographical location of the terminal).

[0269] In the above embodiments, the fact that a terminal-led beam management operation (or beam reporting operation) is performed can be extended to mean that the terminal transmits signaling to the base station indicating whether or not the terminal-led beam management operation (or beam reporting operation) is performed.

[0270] In the above embodiments, the term “stopping or interrupting the terminal-led beam management operation (or beam reporting operation)” may be extended to mean that the terminal (or base station) transmits a signaling indicating the stop or interruption of the terminal-led beam management operation (or beam reporting operation) to the base station (or the terminal). Alternatively, the term “stopping or interrupting the terminal-led beam management operation (or beam reporting operation)” may be definitively interpreted to mean that the existing base station-led beam management operation is performed without performing the terminal-led beam management operation (or beam reporting operation).

[0271] In the above embodiments, when performing a beam reporting operation through the above defined events, the beam report may be transmitted only a specific number of times (at a specific cycle) or may be transmitted continuously (at a specific cycle).

[0272] The methods proposed through the above embodiments can be applied identically or similarly to additionally defined events in addition to the events defined above. The methods proposed through the above embodiments can be applied to intra-cell and / or inter-cell beam management. The methods proposed through the above embodiments can also be applied identically or similarly to mTRP (multi-TRP) operations.

[0273]

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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. A terminal method for event-based beam reporting operation, A step for determining the type of event to be detected; A step of determining a triggering condition of the event based on the determined type; and Including a step of transmitting a beam report according to the event to a base station when the event is detected based on the determined triggering condition, The triggering condition of the above event includes at least one threshold value and at least one hysteresis value. Terminal method.

2. In claim 1, The above detection target event is an event that is triggered when the quality of the current beam falls below a threshold, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of the current beam + hysteresis < threshold Terminal method.

3. In claim 1, The above detection target event is an event that is triggered when the quality of at least one new beam becomes higher than the quality of the current beam by a threshold value, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of at least one new beam - hysteresis > Quality of the current beam + threshold Terminal method.

4. In claim 1, The above detection target event is an event that is triggered when the quality of at least one new beam is higher than a specific threshold value, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of at least one new beam - hysteresis > threshold Terminal method.

5. In claim 1, The above detection target event is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of the current beam + hysteresis < threshold_1 Quality of at least one new beam - hysteresis > threshold_2 Terminal method.

6. In claim 1, The above detection target event is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of the current beam + hysteresis_1 < threshold_1 Quality of at least one new beam - hysteresis_2 > threshold_2 Terminal method.

7. In claim 1, wherein said at least one hysteresis value is determined based on the speed of said terminal, whether said terminal is rotating, whether blockage occurs for said terminal, and / or the position of said terminal. Terminal method.

8. In claim 1, It further includes a step of receiving setting information on triggering conditions for each event type from the base station, wherein the triggering conditions of the event are determined based on the setting information. Terminal method.

9. A method of a base station for event-based beam reporting operation of a terminal, A step of transmitting setting information for triggering conditions by event type to the terminal; and A step of receiving a beam report according to the detected event from the terminal based on a triggering condition of the event to be detected based on the above setting information, The triggering condition of the above event includes at least one threshold value and at least one hysteresis value. Base station method.

10. In claim 9, The above detection target event is an event that is triggered when the quality of the current beam falls below a threshold, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of the current beam + hysteresis < threshold Base station method.

11. In claim 9, The above detection target event is an event that is triggered when the quality of at least one new beam becomes higher than the quality of the current beam by a threshold value, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of at least one new beam - hysteresis > Quality of the current beam + threshold Base station method.

12. In claim 9, The above detection target event is an event that is triggered when the quality of at least one new beam is higher than a specific threshold value, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of at least one new beam - hysteresis > threshold Base station method.

13. In claim 9, The above detection target event is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of the current beam + hysteresis < threshold_1 Quality of at least one new beam - hysteresis > threshold_2 Base station method.

14. In claim 9, The above detection target event is an event that is triggered when the quality of the current beam is lower than or equal to a first threshold and the quality of at least one new beam is higher than or equal to a second threshold, and the triggering condition of the event is determined according to the following mathematical formula: [Mathematical formula] Quality of the current beam + hysteresis_1 < threshold_1 Quality of at least one new beam - hysteresis_2 > threshold_2 Base station method.

15. In claim 9, wherein said at least one hysteresis value is determined based on the speed of said terminal, whether said terminal is rotating, whether blockage occurs for said terminal, and / or the position of said terminal. Base station method.

16. As a terminal for event-based beam reporting operation, At least one processor, wherein the terminal comprises: A step for determining the type of event to be detected; A step of determining a triggering condition of the event based on the determined type; and If the event is detected based on the triggering condition determined above, a step of transmitting a beam report according to the event to the base station is performed, The triggering condition of the above event includes at least one threshold value and at least one hysteresis value. Terminal.

17. In claim 16, wherein said at least one hysteresis value is determined based on the speed of said terminal, whether said terminal is rotating, whether blockage occurs for said terminal, and / or the position of said terminal. Terminal.

18. In claim 1, The at least one processor further performs the step of: receiving setting information on triggering conditions for each event type from the base station, and the triggering conditions of the event are determined based on the setting information. Terminal.

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