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

Abstract

Disclosed are a method and device for uplink transmission / reception in a wireless communication system. The method according to an embodiment of the present disclosure comprises the steps in which a terminal: receives, from a base station, first configuration information related to channel state information (CSI) reporting; receives a first CSI-reference signal (RS) from the base station; and, on the basis that a difference value between a second parameter and a first parameter related to first CSI based on the first CSI-RS is greater than or equal to a threshold value, transmits the first CSI to the base station, wherein the first configuration information may include at least one of information related to the threshold value or information related to the second parameter.

Description

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

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and device for performing uplink transmission and reception in a wireless communication system.

[0002] The fifth generation (5G) wireless communication system, the successor to 4G LTE (long-term evolution), is a new, clean-slate mobile communication system characterized by high performance, low latency, and high availability. 5G NR (New Radio) can utilize all available spectrum resources, from low-frequency bands below 1 GHz, to intermediate-frequency bands between 1 GHz and 10 GHz, and to high-frequency (or millimeter wave) bands above 24 GHz. 6G wireless communication systems are being developed based on the underlying technologies of 5G wireless communication.

[0003] The 6G wireless communication system is being developed with the goals of (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption of battery-free Internet of Things (IoT) devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be divided into four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity. Considering the requirements of the 6G system, such as a peak data rate of 1 Tbps per device, an end-to-end latency of 1 ms, a maximum spectrum efficiency of 100 bps / Hz, support for mobility of 1000 km / h, satellite integration, artificial intelligence (AI), autonomous vehicles, extended reality (XR), and haptic communication, various technologies are being researched.

[0004] The technical problem of the present disclosure is to provide a method and device for performing uplink transmission and reception in a wireless communication system.

[0005] In addition, an additional technical challenge of the present disclosure is to provide a method and device for performing terminal-initiated / triggered or event-based channel state information reporting operations.

[0006] The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0007] A method according to one embodiment of the present disclosure includes the steps of: receiving, by a terminal, first configuration information related to channel state information (CSI) reporting from a base station; receiving, by the terminal, a first CSI-reference signal (RS) from the base station; and transmitting, by the terminal, the first CSI to the base station based on a difference value between a first parameter and a second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, wherein the first configuration information may include at least one of information related to the threshold value or information related to the second parameter.

[0008] According to another embodiment of the present disclosure, a method includes the steps of: transmitting, by a base station, first configuration information related to channel state information (CSI) reporting to a terminal; transmitting, by the base station, a first CSI-reference signal (RS) to the terminal; and receiving, by the base station, the first CSI from the terminal based on a difference value between a first parameter and a second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, wherein the first configuration information may include at least one of information related to the threshold value or information related to the second parameter.

[0009] According to various embodiments of the present disclosure, a method and apparatus for performing uplink transmission and reception in a wireless communication system can be provided.

[0010] Additionally, various embodiments of the present disclosure may provide methods and devices for performing terminal-initiated / triggered or event-based channel state information reporting operations.

[0011] Additionally, various embodiments of the present disclosure may reduce overhead associated with resources for reporting channel state information.

[0012] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description below.

[0013] The accompanying drawings, which are incorporated in and are part of the detailed description to aid in understanding the present disclosure, provide embodiments of the present disclosure and, together with the detailed description, describe the technical features of the present disclosure.

[0014] Figure 1 illustrates a flexible network topology to which some examples of the present disclosure may be applied.

[0015] FIG. 2 illustrates an example of a communication system to which some examples of the present disclosure may be applied.

[0016] FIG. 3 illustrates an example of a wireless device to which some examples of the present disclosure may be applied.

[0017] FIG. 4 exemplarily illustrates a communication procedure between a first node and a second node to which some examples of the present disclosure may be applied.

[0018] FIG. 5 illustrates a functional framework for AI operations to which some examples of the present disclosure may be applied.

[0019] FIG. 6 illustrates an example of operations related to AI model training and AI model inference to which some examples of the present disclosure may be applied.

[0020] FIG. 7 illustrates another example of operations related to AI model training and AI model inference to which some examples of the present disclosure may be applied.

[0021] FIG. 8 illustrates another example of operations related to AI model training and AI model inference to which some examples of the present disclosure may be applied.

[0022] FIG. 9 illustrates an electromagnetic spectrum to which some examples of the present disclosure may be applied.

[0023] FIG. 10 illustrates an example of a system information transmission / reception procedure to which some examples of the present disclosure may be applied.

[0024] FIG. 11 exemplarily illustrates a beam management procedure to which some examples of the present disclosure may be applied.

[0025] Figures 12 and 13 illustrate examples of NTN scenarios to which some examples of the present disclosure may be applied.

[0026] FIG. 14 illustrates examples of sensing operations to which some examples of the present disclosure may be applied.

[0027] FIG. 15 illustrates an example of a procedure for CSI measurement and reporting to which some examples of the present disclosure may be applied.

[0028] FIG. 16 is a flowchart illustrating a method for a terminal to perform a communication procedure according to one embodiment of the present disclosure.

[0029] FIG. 17 is a flowchart illustrating a method for a base station to perform a communication procedure according to one embodiment of the present disclosure.

[0030] FIG. 18 is a diagram for explaining a signaling procedure of a network side and a terminal according to one embodiment of the present disclosure.

[0031] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below, together with the accompanying drawings, is intended to explain exemplary embodiments of the present disclosure and is not intended to represent the only embodiments in which the present disclosure may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present disclosure. However, one of ordinary skill in the art will appreciate that the present disclosure may be practiced without these specific details.

[0032] In some cases, to avoid obscuring the concepts of the present disclosure, known structures and devices may be omitted or illustrated in block diagram form focusing on the core functions of each structure and device.

[0033] In the present disclosure, when a component is said to be "connected," "coupled," or "connected" to another component, this may include not only a direct connection but also an indirect connection in which another component exists between them. Furthermore, the terms "comprises" or "has" in the present disclosure specify the presence of the mentioned features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0034] In this disclosure, terms such as “first,” “second,” etc. are used only to distinguish one component from another and are not used to limit the components, and do not limit the order or importance between the components unless specifically stated otherwise. Accordingly, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

[0035] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of the claims. As used in the description of the embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

[0036] In this disclosure, "A or B" can mean "only A," "only B," or "both A and B." In other words, "A or B" in this disclosure can be interpreted as "A and / or B." For example, "A, B or C" in this disclosure can mean "only A," "only B," "only C," or "any combination of A, B and C."

[0037] As used herein, a slash ( / ) or a comma may mean "and / or." For example, "A / B" may mean "A and / or B." Accordingly, "A / B" may mean "only A," "only B," or "both A and B." For example, "A, B, C" may mean "A, B, or C."

[0038] In the present disclosure, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” Additionally, in the present disclosure, the expressions “at least one of A or B” or “at least one of A and / or B” may be interpreted identically to “at least one of A and B.”

[0039] Additionally, in the present disclosure, “at least one of A, B and C” can mean “only A,” “only B,” “only C,” or “any combination of A, B and C.” Additionally, “at least one of A, B or C” or “at least one of A, B and / or C” can mean “at least one of A, B and C.”

[0040] Additionally, parentheses used in the present disclosure may mean "for example." Specifically, when indicated as "control information (PDCCH)", "PDCCH" may be described as an example of "control information." In other words, "control information" in the present disclosure is not limited to "PDCCH," and "PDCCH" may be described as an example of "control information." Furthermore, even when indicated as "control information (i.e., PDCCH)", "PDCCH" may be described as an example of "control information."

[0041] In the following description, 'when, if, in case of' can be replaced with 'based on'.

[0042] Technical features individually described in one drawing in this disclosure may be implemented individually or simultaneously.

[0043] In the present disclosure, a terminal or user equipment (UE) may be a portable device and may be a first node that receives a signal from a base station / second node / IAB (integrated access backhaul) node.

[0044] In the present disclosure, a base station (BS) may be a second node / IAB node / Transmission-Reception Point (TRP).

[0045] In the present disclosure, higher layer parameters may be parameters configured, pre-configured, or pre-defined for the terminal. For example, a base station or a network may transmit higher layer parameters to the terminal. For example, the higher layer parameters may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0046] In the present disclosure, "setting or defining" may be interpreted as being set to a device through predefined signaling (e.g., SIB (system information block), MAC, RRC) from a base station or network. In the present disclosure, "setting or defining" may be interpreted as being set to a device through separate signaling or being defined in advance without separate signaling.

[0047] In the present disclosure, transmitting or receiving a channel means transmitting or receiving information or a signal through the channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

[0048] The technology described in the present disclosure can be used in various wireless communication systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), LTE (long term evolution), 5G NR, and the like.

[0049] The technology described in the present disclosure can be implemented with 6G wireless technology and applied to various 6G systems. For example, the 6G system can have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine-type communication (mMTC), artificial intelligence (AI) integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0050] Network structure

[0051] Figure 1 illustrates a flexible network topology to which some examples of the present disclosure may be applied.

[0052] To compensate for incomplete network coverage areas, a network topology that allows for more flexible and resilient split radio access networks (RANs) may be considered. For this purpose, various nodes, such as integrated access backhaul (IAB) nodes, relays, and radio frequency (RF) repeaters, as illustrated in Figure 1, may be applied, or a non-terrestrial network (NTN) may be integrated. For example, an IAB node may correspond to a node that provides wireless backhaul. For example, a relay may refer to any intermediate point, and in the case of a sidelink relay where a terminal functions as a relay, it may collectively refer to a terminal-to-network (U2N) relay and a terminal-to-terminal (U2U) relay. For example, an RF repeater may correspond to a node that simply performs the functions of signal amplification and forwarding, or in the case of a network-controlled repeater, it may not only amplify and forward signals but also adjust its transmission and reception settings based on information provided by the network. For example, NTN nodes could be satellites or aircraft that provide NTN coverage that terrestrial networks struggle to provide. Beyond these examples, various intermediate points can be introduced to improve the network topology.

[0053] Referring to Figure 1, a split RAN can support the division of a base station into a centralized unit (CU) and one or more distributed units (DUs). The CU and DU can correspond to logical units. The CU can be further divided into a control plane (CP) portion and one or more user plane (UP) portions. Since a failure in the CU-CP affects not only the CU-UP but also the DUs, various intermediate points can be introduced to compensate for this.

[0054] An intermediate point may correspond to a terminal or a base station, depending on its relationship to other nodes. For example, an IAB node may include a mobile-termination (MT) portion and a unit (DU). The MT may connect the IAB node to a donor node. The unit (DU) of an IAB node may serve other terminals or connect to other IAB nodes to provide multi-hop wireless backhaul to the terminal. For example, an IAB node may correspond to a base station in its relationship to a user-side node, and to a terminal in its relationship to a network-side node.

[0055] In some examples of the present disclosure, the description of a terminal may equally apply not only to a user-side endpoint, but also to an intermediate point corresponding to a terminal in a relative relationship with a network-side endpoint. Similarly, in some examples of the present disclosure, the description of a base station may equally apply not only to a network-side endpoint, but also to an intermediate point corresponding to a base station in a relative relationship with a user-side endpoint. In most cases where there is no additional description of the operations of three or more entities, the communicating entities in the present disclosure are briefly described as terminals and / or base stations (or first nodes and / or second nodes), where the terms terminal and / or base stations (or first nodes and / or second nodes) are interpreted to include / replace any endpoint or any intermediate point in relation to other nodes.

[0056] As such, in some examples of the present disclosure, for the sake of simplicity of explanation, the subjects of the operation may be referred to as terminals and / or base stations (or first nodes and / or second nodes). In addition, the terms terminal and / or base station (or first node and / or second node) may also be interpreted / replaced as in the following examples: For example, the terminal (or first node) and the base station (or second node) may respectively correspond to the first endpoint and the second endpoint; may respectively correspond to the endpoint and the intermediate point; may respectively correspond to the intermediate point and the endpoint; or may respectively correspond to the first intermediate point and the second intermediate point.

[0057] In the present disclosure, there may be zero or more intermediate points between the base station and the terminal. If an intermediate point exists, it may correspond to an IAB node / relay / RF repeater / NTN node, or a node supporting other functions. The intermediate point may be a node with a fixed location or a node with an unfixed location.

[0058] Systems applicable to this disclosure

[0059] FIG. 2 illustrates an example of a communication system to which some examples of the present disclosure may be applied.

[0060] The communication system (100) applied to the present disclosure includes a wireless device (110), a network device (120), and a network (130). Here, the wireless device (110) refers to a device that performs communication using a wireless access technology (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G) and may be referred to as a communication / wireless / 5G / 6G device. Although not limited thereto, the wireless device (110) may include a robot (110a), a vehicle (110b-1, 110b-2), an XR (extended reality) device (110c), a hand-held device (110d), a home appliance (110e), an IoT (Internet of Things) device (110f), and an AI (artificial intelligence) device / server (110g). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle (110b-1, 110b-2) may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device (110c) includes an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) equipped in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. The portable device (110d) may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), a computer (e.g., a laptop, etc.), etc. The home appliance (110e) may include a TV, a refrigerator, a washing machine, etc. The IoT device (110f) may include a sensor, a smart meter, etc. The wireless device (110) may correspond to a terminal (or first node) or an intermediate point.The network device (120) may correspond to a base station (or second node) or another intermediate point. For example, the network device (120) may also be implemented as a wireless device (110), and a specific wireless device (120a) may act as a network device (120) to another wireless device (110).

[0061] Wireless devices (110a to 110f) can be connected to a network (130) via a network device (120). AI technology can be applied to the wireless devices (110a to 110f), and the wireless devices (110a to 110f) can be connected to an AI server (110g) via a network (130). The network (130) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR), or a 6G network. The wireless devices (110a to 110f) can communicate with each other via the network device (120) / network (130), but can also communicate directly (e.g., sidelink communication) without going through the network device (120) / network (130). For example, vehicles (110b-1, 110b-2) can communicate directly (e.g., V2V (vehicle to vehicle) / V2X (vehicle to everything) communication). Additionally, an IoT device (110f) (e.g., a sensor) can communicate directly with another IoT device (e.g., a sensor) or another wireless device (110a to 110f).

[0062] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (110a to 110f) / network devices (120), network devices (120) / network devices (120). Here, the wireless communication / connection can be established through various wireless access technologies such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and communication between network devices (150c) (e.g., relay, IAB (integrated access backhaul)). Through the wireless communication / connection (150a, 150b, 150c), the wireless device and the network device / wireless device, and the network device and the network device can transmit / receive wireless signals to each other. For example, the wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, based on various descriptions of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc., may be performed.

[0063] Device applicable to the present disclosure

[0064] FIG. 3 illustrates an example of a wireless device to which some examples of the present disclosure may be applied.

[0065] Referring to FIG. 3, the wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G). The wireless device (200) includes at least one processor (202) and at least one memory (204), and may additionally include at least one transceiver (206) and / or at least one antenna (208).

[0066] The processor (202) controls the memory (204) and / or the transceiver (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (206). In addition, the processor (202) may receive a wireless signal including second information / signal via the transceiver (206), and then store information obtained from signal processing of the second information / signal in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may store software code including instructions for performing some or all of the processes controlled by the processor (202), or for performing the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology. The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via at least one antenna (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF (radio frequency) unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0067] Hereinafter, the hardware elements of the wireless device (200) will be described in more detail. Although not limited thereto, at least one protocol layer may be implemented by at least one processor (202). For example, at least one processor (202) may implement at least one layer (e.g., a functional layer such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), radio resource control (RRC), and service data adaptation protocol (SDAP)). At least one processor (202) may generate at least one Protocol Data Unit (PDU) and / or at least one Service Data Unit (SDU) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. At least one processor (202) may generate a message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. At least one processor (202) can generate a signal (e.g., a baseband signal) comprising a PDU, an SDU, a message, control information, data or information according to the functions, procedures, proposals and / or methods disclosed in this document, and provide the signal to at least one transceiver (206). At least one processor (202) can receive a signal (e.g., a baseband signal) from at least one transceiver (206) and obtain the PDU, SDU, message, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document.

[0068] At least one processor (202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. The at least one processor (202) may be implemented by hardware, firmware, software, or a combination thereof. For example, at least one application specific integrated circuit (ASIC), at least one digital signal processor (DSP), at least one digital signal processing device (DSPD), at least one programmable logic device (PLD), or at least one field programmable gate array (FPGA) may be included in the at least one processor (202). The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document may be included in the at least one processor (202), or may be stored in at least one memory (204) and driven by the at least one processor (202). The descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed in this document may be implemented using firmware or software in the form of code, instructions and / or sets of instructions.

[0069] At least one memory (204) can be connected to at least one processor (202) and can store various forms of data, signals, messages, information, programs, codes, instructions and / or commands. The at least one memory (204) can be configured as a read only memory (ROM), a random access memory (RAM), an erasable programmable read only memory (EPROM), a flash memory, a hard drive, a register, a cache memory, a computer readable storage medium and / or a combination thereof. The at least one memory (204) can be located internally and / or externally to the at least one processor (202). In addition, the at least one memory (204) can be connected to the at least one processor (202) via various technologies such as a wired or wireless connection.

[0070] At least one transceiver (206) can transmit user data, control information, wireless signals / channels, etc., mentioned in the methods and / or flowcharts of this document to at least one other device. At least one transceiver (206) can receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts disclosed in this document from at least one other device. For example, at least one transceiver (206) can be connected to at least one processor (202) and can transmit and receive wireless signals. For example, at least one processor (202) can control at least one transceiver (206) to transmit user data, control information, or wireless signals to at least one other device. Furthermore, at least one processor (202) can control at least one transceiver (206) to receive user data, control information, or wireless signals from at least one other device. Additionally, at least one transceiver (206) may be connected to at least one antenna (208), and at least one transceiver (206) may be configured to transmit and receive user data, control information, wireless signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed in this document via at least one antenna (208). In this document, at least one antenna may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). At least one transceiver (206) may convert the received wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using at least one processor (202).At least one transceiver (206) may convert user data, control information, wireless signals / channels, etc. processed by at least one processor (202) from a baseband signal to an RF band signal. For this purpose, at least one transceiver (206) may include an (analog) oscillator and / or filter.

[0071] The components of the wireless device described with reference to FIG. 3 may be referred to by different terms in terms of functionality. For example, the processor (202) may be referred to as a control unit, the transceiver (206) as a communication unit, and the memory (204) as a storage unit. In some cases, the communication unit may be used to mean at least a portion of the processor (202) and the transceiver (206).

[0072] The structure of the wireless device described with reference to FIG. 3 can be understood as the structure of at least a portion of various devices. For example, the structure of the wireless device illustrated in FIG. 3 can be at least a portion of various devices described with reference to FIG. 2 (e.g., a robot (110a), a vehicle (110b-1, 110b-2), an XR device (110c), a portable device (110d), a home appliance (110e), an IoT device (110f), an AI device / server (110g)). Furthermore, according to various embodiments, in addition to the components illustrated in FIG. 3, the device may further include other components.

[0073] For example, the device may be a portable device such as a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a portable computer (e.g., a laptop, etc.). In this case, the device may further include at least one of a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc., an interface unit that includes at least one port for connection with another device (e.g., an audio input / output port, a video input / output port), and an input / output unit for inputting and outputting image information / signals, audio information / signals, data, and / or information input from a user.

[0074] For example, the device may be a mobile device such as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, etc. In this case, the device may further include at least one of a driving unit including at least one of an engine, a motor, a power train, wheels, brakes, and a steering unit of the device, a power supply unit including a wired / wireless charging circuit, a battery, etc. that supplies power, a sensor unit that senses status information, environmental information, and user information of the device or its surroundings, an autonomous driving unit that performs functions such as path maintenance, speed control, and destination setting, and a position measurement unit that obtains location information of the mobile device through a global positioning system (GPS) and various sensors.

[0075] For example, the device may be an XR device such as an HMD, a head-up display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. In this case, the device may further include at least one of a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc., an input / output unit that obtains control information, data, etc. from the outside and outputs the generated XR object, and a sensor unit that senses status information, environmental information, and user information of the device or the surroundings of the device.

[0076] For example, the device may be a robot that can be classified into industrial, medical, household, military, etc. types depending on the purpose or field of use. In this case, the device may further include at least one of a sensor unit that senses status information, environmental information, and user information of the device or its surroundings, and a driving unit that performs various physical actions, such as moving the robot joints.

[0077] For example, the device may be an AI device such as a TV, a projector, a smartphone, a PC, a laptop, a digital broadcasting terminal, a tablet PC, a wearable device, a set-top box (STB), a radio, a washing machine, a refrigerator, digital signage, a robot, a vehicle, etc. In this case, the device may further include at least one of an input unit that acquires various types of data from the outside, an output unit that generates output related to sight, hearing, or touch, a sensor unit that senses status information, environmental information, and user information of the device or its surroundings, and a training unit that trains a model composed of an artificial neural network using learning data.

[0078] The structure of the wireless device illustrated in FIG. 3 may be understood as a part of a terminal (or first node), or as a part of an intermediate point, or as a part of a base station (or second node). If the device illustrated in FIG. 3 is a base station (or second node), the device may further include a wired transceiver for front haul and / or back haul communications. If the front haul and / or back haul communications are based on wireless communications, at least one transceiver (206) illustrated in FIG. 3 may be used for front haul and / or backhaul communications, and a wired transceiver may not be included.

[0079] Communication procedures

[0080] FIG. 4 exemplarily illustrates a communication procedure between a first node and a second node to which some examples of the present disclosure may be applied.

[0081] FIG. 4 illustrates operations of a first node (110) (e.g., a terminal) and a second node (120) (e.g., a base station) transmitting and / or receiving data and operations performed prior thereto.

[0082] In step S101, the first node (110) and the second node (120) can perform synchronization. For example, the terminal (110) performs an initial cell search operation. Specifically, the terminal (110) can detect at least one synchronization signal transmitted from the base station (120) according to a predefined rule. Here, the synchronization signal can include a plurality of synchronization signals (e.g., a primary synchronization signal, a secondary synchronization signal) classified according to a structure or purpose. Through this, the terminal (110) can confirm the boundaries of the frame, subframe, slot, and / or symbol of the base station (120) and obtain information (e.g., a cell identifier) ​​about the base station (120).

[0083] In step S103, the first node (110) can obtain system information transmitted from the second node (120). For example, the system information is information related to the properties, characteristics, and / or capabilities of the base station (120) required to access the base station (120) and use the service, and can be classified according to the content (e.g., whether it is essential for access), transmission structure (e.g., the channel used, whether it is provided in an on-demand manner), etc., and can be classified into, for example, a master information block (MIB) and a system information block (SIB). If necessary, the terminal (110) can transmit a signal requesting system information before receiving the system information. Such requesting and providing of system information may be performed after a random access procedure described below.

[0084] In step S105, the first node (110) and the second node (120) can perform a random access procedure. For example, the terminal (110) can transmit and / or receive at least one message (e.g., a random access preamble, a random access response (RAR) message, etc.) for a random access procedure based on information related to a random access channel of the base station (120) obtained through system information (e.g., channel position, channel structure, structure of a supported preamble, etc.). For example, the terminal (110) may transmit a preamble (e.g., message 1 (MSG1)) over a random access channel, receive a random access response (RAR) message (e.g., message 2 (MSG2)), transmit a message (e.g., message 3 (MSG3)) including information related to the terminal (110) (e.g., identification information) using scheduling information included in the RAR message to the base station (120), and receive a message for contention resolution and / or connection establishment (e.g., message 4 (MSG4)). As another example, MSG1 and MSG3 may be transmitted and received as one message (e.g., message A (MSG A)), or MSG2 and MSG4 may be transmitted and received as one message (e.g., message B (MSG B)).

[0085] In step S107, the first node (110) and the second node (120) can perform signaling of control information. For example, the control information can be defined in various layers, such as a layer that controls a connection (e.g., a radio resource control (RRC) layer), a layer that handles mapping between logical channels and transmission channels (e.g., a media access control (MAC) layer), and a layer that handles physical channels (e.g., a physical (PHY) layer). For example, the terminal (110) and the base station (120) can perform at least one of signaling for establishing a connection, signaling for determining settings related to communication, and signaling for indicating allocated resources.

[0086] In step S109, the first node (110) and the second node (120) can transmit and / or receive data. For example, the terminal (110) and the base station (120) can process, transmit, and / or receive data based on signaling of control information. For example, when transmitting data, the terminal (110) or the base station (120) can perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and resource mapping on information bits. For example, when receiving data, the terminal (110) or the base station (120) can perform at least one of signal extraction from resources, waveform demodulation for each antenna, signal arrangement considering layer mapping, constellation demapping, descrambling, and channel decoding.

[0087] 6G system core technologies

[0088] As core implementation technologies of the 6G system, technologies such as artificial intelligence (AI), THz (terahertz) communication, optical wireless technology, free space optics (FSO) backhaul network, massive MIMO (multiple input multiple output) technology, blockchain, 3D networking, quantum communication, unmanned aerial vehicles, cell-free communication, wireless information and energy transfer (WIET), integration of sensing and communication, integration of access backhaul networks, holographic beamforming, big data analysis, and large intelligent surface (LIS) can be adopted.

[0089] artificial intelligence

[0090] Incorporating AI into communications can streamline and improve real-time data transmission. AI can use numerous analytics to determine how complex target tasks should be performed. AI can increase efficiency and reduce processing delays. Time-consuming tasks such as handovers, network selection, and resource scheduling can be performed instantly using AI. AI can also play a crucial role in machine-to-machine (M2M), machine-to-human, and human-to-machine communications. Furthermore, AI can facilitate rapid communication in brain-computer interfaces (BCIs). AI-based communication systems can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-sustaining wireless networks, and machine learning.

[0091] FIG. 5 illustrates a functional framework for AI operations to which some examples of the present disclosure may be applied.

[0092] Below, to explain AI (or AI / ML (machine learning)) in more detail, the terms can be defined as follows.

[0093] - Data collection: Data collected from network nodes, management entities, or terminals as a basis for AI model training, data analysis, and inference.

[0094] - AI model: A data-driven algorithm that applies AI technology to generate a set of outputs containing predictive information and / or decision parameters based on a set of inputs.

[0095] - AI / ML training: An online or offline process of training an AI model by learning features and patterns that best represent the data and obtain a trained AI / ML model for inference.

[0096] - AI / ML inference: The process of making predictions or inducing decisions based on collected data and the AI ​​model using a trained AI model.

[0097] Referring to FIG. 5, the data collection function (10) is a function that collects input data and provides processed input data to the model training function (20) and the model inference function (30).

[0098] Examples of input data may include measurements from terminals or other network entities, feedback from actors, and output from AI models.

[0099] The data collection function (10) performs data preparation based on input data and provides input data processed through the data preparation. Here, the data collection function (10) does not perform data preparation specific to each AI algorithm (e.g., data pre-processing and cleaning, formatting, and transformation), but can perform data preparation common to all AI algorithms.

[0100] After the data preparation process is performed, the data collection function (10) may provide training data (11) to the model training function (20) and may provide inference data (12) to the model inference function (30). Here, the training data (11) may correspond to data required as input for the AI ​​model training function (20), and the inference data (12) may correspond to data required as input for the AI ​​model inference function (30).

[0101] The data collection function (10) may be performed by a single entity (e.g., a terminal, a RAN node, a network node, etc.), but may also be performed by multiple entities. In this case, training data (11) and inference data (12) may be provided to the model training function (20) and model inference function (30), respectively, from multiple entities.

[0102] The model training function (20) may correspond to a function that performs AI model training, validation, and testing, which can generate model performance metrics as part of the AI ​​model testing procedure. If necessary, the model training function (20) may also be responsible for data preparation (e.g., data pre-processing and cleaning, formatting, and transformation, etc.) based on training data (11) provided by the data collection function (10).

[0103] Here, model deployment / update (13) can be used to initially deploy a trained, validated and tested AI model to the model inference function (30) or to provide an updated model to the model inference function (30).

[0104] The model inference function (30) may correspond to a function that provides AI model inference output (16) (e.g., prediction or decision). If applicable, the model inference function (30) may provide model performance feedback (14) to the model training function (20). In addition, the model inference function (30) may also be responsible for data preparation (e.g., data pre-processing and cleaning, formatting and transformation, etc.) based on inference data (12) provided by the data collection function (10), if necessary.

[0105] Here, output (16) refers to the inference output of the AI ​​model generated by the model inference function (30), and the details of the inference output may vary depending on the use case.

[0106] Model performance feedback (14) can be used to monitor the performance of the AI ​​model, if available, and this feedback may be omitted.

[0107] An actor function (40) is a function that receives an output (16) from a model inference function (30) and triggers or performs a corresponding task / action. The actor function (40) can trigger tasks / actions for other entities (e.g., one or more terminals, one or more RAN nodes, one or more network nodes, etc.) or for itself.

[0108] Feedback (15) can be used to derive training data (11), inference data (12), or to monitor the performance of the AI ​​model, its impact on the network, etc.

[0109] Meanwhile, the definitions of training / validation / test in data sets used in AI / ML can be distinguished as follows.

[0110] - Training data: refers to a data set for learning a model.

[0111] - Validation data: This refers to a dataset used to validate a model that has already completed training. Validation data can typically be used to prevent overfitting of the training data set. It can also be used to select the best model among the various models learned during the training process. Therefore, validation can be considered a type of learning.

[0112] - Test data: This refers to the data set for final evaluation. This data is unrelated to learning.

[0113] For example, the training and validation data can be divided into an 8:2 or 7:3 ratio within the entire data set. Alternatively, the training data:validation data:test data can be divided into a 6:2:2 ratio within the entire data set.

[0114] The level of cooperation can be defined as follows depending on whether the base station and the terminal have capabilities for AI / ML functions, and variations due to combination of multiple levels or separation of any one level are also possible.

[0115] Category 0a: This category corresponds to a no-collaboration framework. In this case, AI / ML algorithms are purely implementation-based and may not require any changes to the wireless interface.

[0116] Category 0b: Frameworks that involve a wireless interface modified to fit efficient implementation-based AI / ML algorithms, but without collaboration.

[0117] Category 1: This category applies to cases where inter-node support is required to improve the AI / ML algorithms of each node. For example, this applies when a terminal receives support from a base station (for training, adaptation, etc.), and vice versa. At this level, model exchange between network nodes is not required.

[0118] Category 2: This applies to cases where joint ML tasks can be performed between terminals and base stations. This level requires exchange of AI / ML model commands or network nodes.

[0119] The functions exemplified in FIG. 5 above may be implemented in a RAN node (e.g., a base station, a TRP, a CU of a base station, etc.), a network node, an OAM (operation administration maintenance) of a network operator, or a terminal.

[0120] Alternatively, two or more entities, such as a RAN, a network node, a network operator's OAM, or a terminal, may cooperate to implement the functions illustrated in FIG. 5. For example, one entity may perform some of the functions of FIG. 5, and another entity may perform the remaining functions. In this way, since some of the functions illustrated in FIG. 5 are performed by a single entity (e.g., a terminal, a RAN node, a network node, etc.), the transmission / provision of data / information between each function may be omitted. For example, if the model training function (20) and the model inference function (30) are performed by the same entity, the transmission / provision of model deployment / update (13) and model performance feedback (14) may be omitted.

[0121] Alternatively, any one of the functions illustrated in FIG. 5 may be performed collaboratively by two or more entities, including a RAN, a network node, a network operator's OAM, or a terminal. This may be referred to as a split AI operation.

[0122] FIG. 6 illustrates an example of operations related to AI model training and AI model inference to which some examples of the present disclosure may be applied.

[0123] For example, the AI ​​model training function may be performed by a network node (e.g., a core network node, an OAM of a network operator, etc.), and the AI ​​model inference function may be performed by a RAN node (e.g., a base station, a TRP, a CU of a base station, etc.).

[0124] Step 1: RAN node 1 and RAN node 2 can transmit input data (e.g., training data) for AI model training to the network node. Here, RAN node 1 and RAN node 2 can also transmit data collected from the terminal (e.g., terminal measurements related to RSRP (reference signal received power), RSRQ (reference signal received quality), SINR (signal to interference-plus-noise ratio) of the serving cell and neighboring cells, terminal location, speed, etc.) to the network node.

[0125] Step 2: Network nodes can train AI models using the received training data.

[0126] Step 3: The network node may distribute / update the AI ​​model to RAN node 1 and / or RAN node 2. RAN node 1 (and / or RAN node 2) may also continue model training based on the received AI model.

[0127] For convenience of explanation, we assume that the AI ​​model is deployed / updated only to RAN node 1.

[0128] Step 4: RAN node 1 can receive input data (e.g., inference data) for AI model inference from the terminal and RAN node 2.

[0129] Step 5: RAN node 1 can perform AI model inference using the received inference data to generate output data (e.g., prediction or decision).

[0130] Step 6: If applicable, RAN node 1 may send model performance feedback to the network nodes.

[0131] Step 7: RAN node 1, RAN node 2, and the terminal (or 'RAN node 1 and the terminal', or 'RAN node 1 and RAN node 2') may perform actions based on the output data. For example, in the case of a load balancing operation, the terminal may move from RAN node 1 to RAN node 2.

[0132] Step 8: RAN node 1 and RAN node 2 can transmit feedback information to the network nodes.

[0133] FIG. 7 illustrates another example of operations related to AI model training and AI model inference to which some examples of the present disclosure may be applied.

[0134] For example, both AI model training functions and AI model inference functions can be performed by RAN nodes (e.g., base stations, TRPs, CUs of base stations, etc.).

[0135] Step 1: The terminal and RAN node 2 can transmit input data (e.g., training data) for AI model training to RAN node 1.

[0136] Step 2: RAN node 1 can train an AI model using the received training data.

[0137] Step 3: RAN node 1 can receive input data (e.g., inference data) for AI model inference from the terminal and RAN node 2.

[0138] Step 4: RAN node 1 can perform AI model inference using the received inference data to generate output data (e.g., prediction or decision).

[0139] Step 5: RAN node 1, RAN node 2, and the terminal (or 'RAN node 1 and the terminal', or 'RAN node 1 and RAN node 2') may perform actions based on the output data. For example, in the case of a load balancing operation, the terminal may move from RAN node 1 to RAN node 2.

[0140] Step 6: RAN node 2 may transmit feedback information to RAN node 1.

[0141] FIG. 8 illustrates another example of operations related to AI model training and AI model inference to which some examples of the present disclosure may be applied.

[0142] For example, the AI ​​model training function may be performed by a RAN node (e.g., a base station, a TRP, a CU of a base station, etc.), and the AI ​​model inference function may be performed by a terminal.

[0143] Step 1: The terminal may transmit input data (e.g., training data) for AI model training to the RAN node. Here, the RAN node may collect data (e.g., terminal measurements related to RSRP, RSRQ, SINR of the serving cell and neighboring cells, terminal location, speed, etc.) from various terminals and / or from other RAN nodes.

[0144] Step 2: RAN nodes can train AI models using the received training data.

[0145] Step 3: The RAN node can distribute / update the AI ​​model to the terminal. The terminal can also continue model training based on the received AI model.

[0146] Step 4: Input data (e.g., inference data) for AI model inference can be received from the terminal and RAN node (and / or from another terminal).

[0147] Step 5: The terminal can perform AI model inference using the received inference data to generate output data (e.g., prediction or decision).

[0148] Step 6: If applicable, the terminal may send model performance feedback to the RAN node.

[0149] Step 7: The terminal and RAN node can perform actions based on the output data.

[0150] Step 8: The terminal may transmit feedback information to the RAN node.

[0151] THz communication (terahertz communication)

[0152] Data transmission rates can be increased by increasing bandwidth. This can be achieved by utilizing sub-THz communications with wide bandwidths and applying advanced massive MIMO technology. THz waves, also known as sub-millimeter waves, typically refer to the frequency range between 0.1 THz and 10 THz, with corresponding wavelengths ranging from 0.03 mm to 3 mm. The 100 GHz to 300 GHz band (the sub-THz band) is considered a key part of the THz spectrum for cellular communications. Adding the sub-THz band to the mmWave band will increase 6G cellular capacity. Among the defined THz bands, 300 GHz to 3 THz lies in the far infrared (IR) frequency band. While part of the optical band, the 300 GHz to 3 THz band lies at the boundary of the optical band, immediately following the RF band. Therefore, this 300 GHz to 3 THz band exhibits similarities to RF.

[0153] FIG. 9 illustrates an electromagnetic spectrum to which some examples of the present disclosure may be applied.

[0154] Key characteristics of THz communications include (i) the widely available bandwidth to support very high data rates, and (ii) the high path loss at high frequencies (which necessitates highly directional antennas). The narrow beamwidths generated by highly directional antennas reduce interference. The small wavelength of THz signals allows for a significantly larger number of antenna elements to be integrated into devices and base stations operating in this band. This enables the use of advanced adaptive array technologies to overcome range limitations.

[0155] Transmitting system information (e.g., MIB) in a cell in the THz frequency band can be inefficient because the beam width in high-frequency bands narrows, requiring more beam sweeps to cover the entire cell area. This method is particularly inefficient when there are only a few users within the cell.

[0156] FIG. 10 illustrates an example of a system information transmission / reception procedure to which some examples of the present disclosure may be applied.

[0157] The example of Fig. 10 is applicable not only to THz communication environments but also to 6G communication environments where THz communication is not applicable. Furthermore, the procedure illustrated in Fig. 10 can be combined with various embodiments of the present disclosure described below. For example, the embodiments described below can be performed based on system information acquired through the procedure illustrated in Fig. 10.

[0158] In step S1010, the second node (120) (e.g., base station) can transmit system information of cell #1 via cell #2. For example, the base station provides at least two cells, cell #1 uses a THz frequency band, and cell #2 uses a frequency band other than the THz frequency band. Here, the system information may include at least one of an SFN (system frame number), a PDCCH configuration for SIB1, cell barring, cell re-selection, and subcarrier spacing generated in a higher layer, and may include at least one of an SFN, a half frame indicator, and an SSB index (synchronization signal / PBCH (physical broadcast channel) block index) generated in a physical layer. For this purpose, as an example, cell #1 and cell #2 may have a relationship of a secondary cell and a primary cell.

[0159] At step S1030, the first node (110) (e.g., terminal) can acquire synchronization for cell #1. Synchronization can be acquired by detecting a synchronization signal. Typically, synchronization is acquired before receiving system information, but since the system information for cell #1 is received from cell #2, synchronization acquisition for cell #1 can be performed after receiving the system information. For example, the terminal can acquire synchronization based on the system information. Alternatively, synchronization acquisition can be performed before step S1010.

[0160] At step S1050, the first node (110) may transmit a signal for accessing cell #1. For example, the signal may include a random access preamble. The structure of this signal and the resources (e.g., channels) for transmitting the signal may be identified through system information. Thereafter, at step S1070, the first node (110) and the second node (120) may perform an access procedure for cell #1 and communicate.

[0161] The procedure described with reference to FIG. 10 may be performed when the first node (110) initially connects to cell #1 of the second node (120). Alternatively, a similar procedure may be performed when the first node (110) hands over to cell #1 of the second node (120). However, in the case of handover, the system information of cell #1 may be received from a cell of a base station other than cell #2 of the second node (120).

[0162] Communications in the THz band are expected to experience extremely severe path loss, and to overcome this, terminals and base stations may be required to use very sharp beams. The use of sharp beams means that terminals and base stations must perform beam control in addition to beamforming, and the number of beams used increases significantly. Consequently, it takes a very long time to align the transmit and receive beams between the base station and terminals. Furthermore, if the beam alignment between the base station and terminals is misaligned due to movement or movement of the terminals, frequent re-alignment of the beams may be required, resulting in link instability.

[0163] FIG. 11 exemplarily illustrates a beam management procedure to which some examples of the present disclosure may be applied.

[0164] Although FIG. 11 illustrates an example of a procedure for searching and / or selecting beams for THz communication, this procedure is not limited to a THz environment and can also be applied to a 6G communication environment where THz communication is not applied.

[0165] Here, beam may be interpreted as other terms having equivalent technical meanings that can distinguish beams, such as 'spatial domain filter', 'spatial domain transmit filter', 'spatial domain receive filter', reference signal (RS) resource that distinguishes beams, SSB index, etc.

[0166] In step S1110, the second node (120) (e.g., base station) can set resources for beam management to the first node (110) (e.g., terminal). Here, the resources can include at least one of time-frequency resources, channels, and spatial resources (e.g., antenna ports). For example, the base station can utilize a beam search signal (BSS) that is transmitted spatially separated from an existing downlink signal / channel for beam search. Here, the BSS can be transmitted based on a dedicated port for beam search. The dedicated port can be a different port from a port for transmitting an existing downlink signal / channel (e.g., SSB, PDSCH (physical downlink shared channel), etc.). BSS is a term defined for convenience of explanation, and the technical concept according to the present embodiment is not limited to the term BSS itself. For example, a signal transmitted based on a dedicated port defined / set for beam search can be included in the technical concept according to the present embodiment.

[0167] In step S1130, the second node (120) (e.g., base station) transmits measurement signals using a plurality of transmission beams. For example, the measurement signals may include at least one of a reference signal and a synchronization signal. At this time, the measurement signals may be transmitted as many times as the number of beams that require measurement, and may also be transmitted in a multi-beam transmission method that forms a plurality of beams simultaneously to reduce sweeping time. Here, the multi-beam transmission may be performed based on at least one of a multi-panel, a sub-array, and a true time delay (TTD).

[0168] In step S1050, a first node (110) (e.g., a terminal) may transmit a feedback signal to a second node (120) (e.g., a base station). The feedback signal may indicate at least one beam selected by the terminal. The terminal may select at least one preferred beam based on the measurement signals received in step S1030.

[0169] In step S1070, the first node (110) and the second node (120) can perform communication. For example, the second node (120) can perform transmission to the first node (110) using the reception beam of the first node (110) selected in step S1050. If channel reciprocity is established, the transmission beam of the first node (110) can also be determined through steps S1030 and S1050, so that the transmission operation from the first node (110) can also be performed using a beam that has a reciprocal relationship with the beam selected in step S1050. If channel reciprocity is not established, a procedure including transmission of measurement signal(s) by the first node (110) and transmission of feedback signal(s) by the second node (120) may be performed first to determine the transmission beam of the first node (110).

[0170] non-terrestrial networks (NTN)

[0171] Figures 12 and 13 illustrate examples of NTN scenarios to which some examples of the present disclosure may be applied.

[0172] NTN can represent a network or network segment that uses radio frequency (RF) resources mounted on a satellite (or unmanned aerial system (UAS) platform).

[0173] Figure 12 shows an example of a typical scenario of NTN based on transparent payload, and Figure 13 shows an example of a typical scenario of NTN based on regenerative payload.

[0174] Referring to Figure 12, a satellite (or UAS platform) can establish a service link with a terminal. The satellite (or UAS platform) can be connected to a gateway via a feeder link. The satellite can be connected to a data network via the gateway. The beam footprint can refer to the area where the signal transmitted by the satellite can be received.

[0175] Referring to Figure 13, a satellite (or UAS platform) can establish a service link with a terminal. A satellite (or UAS platform) connected to a terminal can be connected to another satellite (or UAS platform) via an inter-satellite link (ISL). The other satellite (or UAS platform) can be connected to a gateway via a feeder link. Based on the regenerated payload, the satellite can be connected to a data network through another satellite and the gateway. If an ISL does not exist between the satellite and another satellite, a feeder link between the satellite and the gateway may be required.

[0176] Figures 12 and 13 are only examples of NTN scenarios, and NTN can be implemented based on various scenarios. For example, a satellite (or UAS platform) can implement a transparent or regenerative (e.g., with onboard processing) payload. For example, a satellite (or UAS platform) can generate multiple beams across a designated service area depending on the field of view of the satellite (or UAS platform). For example, the field of view of the satellite (or UAS platform) can vary depending on the onboard antenna diagram and the minimum elevation angle.

[0177] For example, a transparent payload may include radio frequency filtering, frequency conversion, and amplification. Therefore, the waveform signal repeated by the payload may remain unchanged.

[0178] For example, a regenerative payload may include radio frequency filtering, frequency conversion and amplification, demodulation / decoding, switching and / or routing, and coding / modulation. For example, a regenerative payload may be substantially equivalent to mounting all or part of a base station function on a satellite (or UAS platform).

[0179] Integrated Sensing and Communication (ISAC)

[0180] Wireless sensing is a technology that uses radio frequencies to determine the instantaneous linear velocity, angle, distance (or range) of an object, and thus obtain information about the characteristics of the environment and / or objects within the environment. Because radio frequency sensing does not require a networked device to connect to the object, it can provide a service for object positioning without a device. The ability to obtain range, velocity, and angle information from radio frequency signals can enable a wide range of new capabilities, such as various object detection, object recognition (e.g., vehicles, humans, animals, UAVs), and high-precision localization, tracking, and activity recognition. Wireless sensing services can provide information to a variety of industries (e.g., drones, smart homes, V2X, factories, railways, public safety, etc.), enabling applications such as intruder detection, assisted vehicle steering and navigation, trajectory tracking, collision avoidance, traffic management, and health and traffic management. In some cases, wireless sensing can utilize non-3GPP type sensors (e.g., radar, cameras) to further support 3GPP-based sensing. For example, the operation of wireless sensing services, such as sensing operations, may depend on the transmission, reflection, and scattering of wireless sensing signals. Therefore, wireless sensing offers an opportunity to enhance existing communication systems from a communications network to a wireless communication and sensing network.

[0181] FIG. 14 illustrates examples of sensing operations to which some examples of the present disclosure may be applied.

[0182] Specifically, Fig. 14(a) shows an example of a monostatic sensing operation using a sensing receiver and a sensing transmitter located in the same location. Fig. 14(b) shows an example of a bistatic sensing operation using a sensing receiver and a sensing transmitter located in separate locations. A sensing signal transmitted from a sensing transmitter is reflected / scattered by a sensing object, and the sensing receiver can receive the signal, and extract / obtain sensing data based on the received signal. A sensing result can be generated / determined through appropriate processing of the sensing data. The sensing result can be provided to a trusted third-party entity / service outside the 3GPP system through an entity / service within the 3GPP system.

[0183] Channel State Information (CSI) Measurement and Reporting

[0184] FIG. 15 illustrates an example of a procedure for CSI measurement and reporting to which some examples of the present disclosure may be applied.

[0185] A second node (120) (e.g., a base station) can transmit configuration information for CSI to a first node (110) (e.g., a terminal). The configuration information for CSI can include information related to a reference signal (e.g., a CSI-RS) resource or a resource set for CSI (e.g., time-frequency resource information, sequence information, power information, etc.), information related to CSI reporting (e.g., report item (quantity) information, report type information, report resource information, codebook information, etc.), information related to CSI measurement, etc.

[0186] For example, to assist the base station with transceiver muting and / or transmit power adaptation of the base station, the terminal may be configured to report multiple CSI entries in a CSI report based on multiple sub-configurations. For example, each sub-configuration may correspond to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a power offset. With respect to CSI reporting, a higher layer parameter included in the configuration information (e.g., CSI-ReportConfig) may include a list of sub-configurations, and each sub-configuration may be identified by an identifier (e.g., csi-ReportSubConfigID). For example, each sub-configuration may correspond to a list of at least one CSI-RS resource, or may correspond to a subset of CSI-RS antenna ports, and / or may correspond to power-related parameters of the CSI-RS resource(s) (e.g., power control offset-related parameters (e.g., powerControlOffset) and / or power offset for a PDSCH associated with the CSI-RS).

[0187] For example, an information element (IE) for an aperiodic trigger state list for CSI may include a trigger list parameter for a CSI reporting sub-configuration. This parameter may include a list of sub-configuration ID(s) of N sub-configuration(s) among L configured sub-configurations within a CSI reporting configuration that are associated with triggering states for aperiodic CSI reporting on an uplink data channel (e.g., a physical uplink shared channel (PUSCH)).

[0188] For example, an IE for a CSI reporting configuration may include parameters for a list of CSI reporting sub-configuration ID(s) to be added / modified or released. Port subset indicators and a list of non-zero power (NZP) CSI-RS resources may not be configured simultaneously in the same CSI reporting configuration.

[0189] For example, an IE for a CSI reporting sub-configuration may include a port-subset indicator parameter, an NZP CSI-RS resource list parameter, and a power offset parameter.

[0190] The port-subset indicator parameter may indicate the number of ports of the NZP CSI-RS resources indicated in the NZP CSI-RS resource list (the value of which is equal to the number of ports of the corresponding NZP CSI-RS resources) and the (sub)set of CSI-RS antenna ports used for CSI calculation of the sub-configuration. Each bit in the bit string of the port-subset indicator corresponds to an antenna port, and if any bit is set to 1, the corresponding port may be enabled for CSI calculation corresponding to the sub-configuration, and if any bit is set to 0, the corresponding port may not be enabled for CSI calculation corresponding to the sub-configuration.

[0191] The NZP CSI-RS resource list parameter may indicate a list of NZP CSI-RS resources for a sub-configuration, which is a (sub)set of NZP CSI-RS resource(s) of a CSI-RS resource set for channel measurements associated with the sub-configuration of the CSI reporting configuration. The values ​​0, 1, 2, ... may mean the first, second, third, ... NZP CSI-RS resources of the CSI-RS resource set.

[0192] When the power offset parameter is set for an NZP CSI-RS resource, it may indicate that a power offset is applied between the PDSCH RE (resource element) and the NZP CSI-RS RE by the difference in the value of the power offset parameter from the value of the power control offset parameter.

[0193] When a configuration for CSI includes multiple sub-configurations, when interpreting the configuration information for CSI, the terminal may determine CSI-RS resources, CSI-RS port mapping, power offset, codebook type, report items, etc. by considering the sub-configurations. When configuration information related to CSI reporting including sub-configurations (e.g., CSI-ReportConfig) is provided to the terminal, the terminal may not expect that a higher layer parameter related to a report item (e.g., reportQuantity) is set to 'cri-RSRP', 'cri-SINR', 'cri-SINR-Index', 'cri-RSRP-Index', 'none', 'ssb-Index-RSRP', 'ssb-Index-SINR', 'ssb-Index-RSRP-Index', 'ssb-Index-SINR-Index' or 'tdcp' (wherein CRI corresponds to a CSI-RS resource index, and tdcp corresponds to time domain channel properties). Additionally, when the type of CSI reporting is set to semi-persistent CSI reporting or aperiodic CSI reporting, the base station can activate / trigger only some of the sub-configurations configured for the UE through MAC-CE (control element) or DCI (downlink control information). For example, the trigger state of aperiodic CSI reporting can be configured as needed, and whether semi-static CSI reporting is activated can be controlled by an activation command.

[0194] For example, with respect to the configuration of a report quantity, the terminal may determine the CSI-RS port index(es) for each CSI-RS resource based on information related to a port subset per sub-configuration (hereinafter referred to as a "port subset indicator"). The port subset indicator may include a bitmap for specifying some of the antenna ports for the corresponding CSI-RS resource. Accordingly, the terminal may identify at least one antenna port for the corresponding sub-configuration based on the positions of bits set to positive values ​​(e.g., 1) in the port subset indicator.

[0195] For example, with respect to the configuration of report items (report quantity), the terminal may determine the codebook type based on the presence or absence of sub-configurations. Specifically, if sub-configurations are configured for CSI reporting, the terminal may exclude the configuration of at least one codebook type. For example, if the terminal's capabilities support it, at least one codebook type may be configured.

[0196] For example, in relation to the configuration of the report quantity, a power offset value and an NZP CSI-RS resource set may be configured for each sub-configuration. For example, depending on whether a power offset value is configured for each sub-configuration and whether an NZP CSI-RS resource set is configured, the interpretation of the NZP CSI-RS resource set for each sub-configuration may vary.

[0197] When determining the channel quality indicator (CQI), a higher-layer parameter related to time restrictions for channel measurements (e.g., timeRestrictionForChannelMeasurements) may be configured. In this case, the terminal can derive a channel estimate for determining CSI based on the most recent CSI reference resource. For example, if cell DTX is activated for the base station, the cell DTX activation time, etc., may be considered to determine the CSI reference resource, etc.

[0198] CSI is derived based on CSI reference resources. A CSI reference resource is defined as a group of downlink physical resource blocks corresponding to a band related to the CSI derived in the frequency domain, and is defined as a single downlink slot determined based on higher-layer parameters and subcarrier spacing in the time domain. After receiving a CSI-RS, a UE can transmit a CSI report no later than the CSI reference resource. For example, if sub-configurations are configured for a CSI report, a CSI reference resource may be considered for each sub-configuration.

[0199] When at least one of a CQI index, a precoding matrix index (PMI), and a rank indicator (RI) is set to be reported, in the CSI reference resource, the terminal may assume specific values ​​for the symbol positions and number occupied by control signaling, the number of PDSCH and demodulation reference signal (DMRS) symbols, the subcarrier spacing of the bandwidth part (BWP), the bandwidth for CQI reporting, the length and subcarrier spacing of the cyclic prefix (CP) of the reference resource, and the redundancy version (RV), for the purpose of deriving at least one of the CQI index, PMI, and RI. At this time, when sub-configurations are set for the CSI reporting, assumptions about the antenna port, EPRE (energy per resource element), etc. may be determined based on the sub-configurations.

[0200] Based on the aforementioned configuration, the base station can transmit at least one CSI-RS to the terminal. Based on the aforementioned configuration, the terminal can receive at least one CSI-RS and perform measurement on it. For example, the at least one CSI-RS can be transmitted via a CSI-RS resource or resource set configured by the configuration information.

[0201] When the terminal is set to DRX (discontinuous reception), the terminal can perform measurements as follows. For example, when the terminal is set to monitor power saving related control information (e.g., DCI format 2_6) and the DRX related timer (e.g., drx-onDurationTimer) has not been started by a higher layer parameter (e.g., ps-TransmitOtherPeriodicCSI), and is set to report CSI using a reporting configuration type set to periodic reporting and a reporting item set to an item other than cri-RSRP and ssb-index-RSRP, the most recent CSI measurement opportunity occurs during the time indicated by drx-onDurationTimer in the DRX related configuration information (e.g., DRX-Config) other than the DRX active time or the DRX active time for the CSI to be reported. As another example, if the terminal is configured to monitor power saving related control information (e.g., DCI format 2_6) and is configured to report L1-RSRP using a report configuration type set to periodic reporting and a report item set to cri-RSRP in a situation where drx-onDurationTimer has not started by a higher layer parameter (e.g., ps-TransmitPeriodicL1-RSRP), the most recent CSI measurement opportunity occurs during a time indicated by drx-onDurationTimer in DRX-related configuration information (e.g., DRX-Config) other than the DRX active time or the DRX active time for the CSI to be reported. In addition, the most recent CSI measurement opportunity occurs within the DRX active time for the CSI to be reported.

[0202] A base station may perform cell DTX and / or cell DRX operations. In this case, during the inactive period of cell DTX, a terminal configured as cell DTX may not expect to receive periodic CSI-RS and semi-static CSI-RS, at least as configured in a CSI reporting configuration associated with a report item including RI. When cell DTX is activated for a serving cell, the most recent CSI measurement opportunity of a semi-static CSI-RS resource or a periodic CSI-RS resource may occur within the active periods of cell DTX for CSI reporting, at least as configured by configuration information (e.g., CSI-ReportConfig) related to CSI reporting associated with a report item including RI.

[0203] A terminal that receives at least one CSI-RS can determine CSI. For example, the terminal can perform CSI calculation. The terminal can perform CSI calculation based on CSI processing criteria. The terminal can indicate the number of supported concurrent CSI calculations, for example, the number of CSI processing units (CPUs) that can be performed simultaneously, called NCPU. The terminal can determine the number of CPUs for a given CSI report based on at least one of the NCPU, the number of CPUs for each CSI report, the number of CPUs currently occupied, and the settings of the report items. For example, for configuration information (e.g., CSI-ReportConfig) related to CSI reporting that includes a report item parameter (e.g., reportQuantity) that is not set to 'none', the CPU(s) may be occupied for at least one orthogonal frequency division multiplexing (OFDM) symbol, wherein the number of at least one symbol may be determined based on CSI-RS resources or CSI-IM (interference measurement) resources associated with the sub-configurations.

[0204] When configuration information related to CSI reporting (e.g., CSI-ReportConfig) includes multiple sub-configurations, the number of CPUs occupied by the CSI report may be determined based on the number of CSI-RS resources corresponding to the sub-configurations. For example, the number of CSI-RS resources may be determined based on the number of times they are referred in the configuration information related to CSI reporting (e.g., CSI-ReportConfig) or the number of sub-configurations referencing the corresponding CSI-RS resources.

[0205] A terminal that has determined CSI can transmit a CSI report to a base station. The terminal can transmit CSI(s) for at least one sub-configuration according to a report item parameter (e.g., reportQuantity) configured for configuration information related to the CSI report (e.g., CSI-ReportConfig). For example, the CSI report can include at least one of PMI, CQI, RI, CRI (CSI-RS resource indicator), SSBRI (SSB resource index), LI (layer indicator), and RSRP. In this case, the CSI report can include a Part 1 CSI report and a Part 2 CSI report. In addition, the CSI report can be transmitted through at least one of a physical uplink control channel (PUCCH) or a PUSCH.

[0206] When a terminal multiplexes a CSI report including a Part 2 CSI report on a PUCCH resource, the terminal determines the number of PUCCH resources and physical resource blocks (PRBs) for the PUCCH resource or the number of Part 2 CSI reports, assuming that each CSI report or each CSI sub-report included in the CSI report indicates rank 1 or the rank combination {1, 1}. When a higher layer parameter related to the CSI reporting mode (e.g., csi-ReportMode) is set to 'Mode2', the terminal determines the PUCCH resource and the number of PRBs for the PUCCH resource or the number of Part 2 CSI reports, assuming that each CRI of the CSI report is associated with a resource pair.

[0207] When a CSI report on PUSCH includes two parts, the UE may omit some of the Part 2 CSI. The omission of Part 2 CSI is in priority order. When omitting Part 2 CSI information for a particular priority level, the UE shall exclude all information for that priority level, except when the corresponding CSI report includes at least one CSI sub-report including Part 2, which corresponds to a sub-configuration from a list of sub-configurations provided by a higher layer parameter (e.g., csi-ReportSubConfigList) included in information related to the CSI report (e.g., CSI-ReportConfig).

[0208] For a report configuration related to information related to a CSI report (e.g., CSI-ReportConfig) that includes a list of sub-configurations, the following processing is possible: For a corresponding CSI report that includes at least one CSI sub-report, omission of Part 2 CSI is performed at the sub-configuration level within the same priority level, where a sub-configuration with a lower index value has a higher priority.

[0209] If a CSI report consists of two parts, a UE may omit some of the Part 2 CSI. The omission of Part 2 CSI is based on a priority order. For a report configuration related to information related to a CSI report (e.g., CSI-ReportConfig) that includes a list of sub-configurations, for a given CSI report that includes at least one CSI sub-report, the omission of Part 2 CSI may be applied according to the CSI reporting procedure using PUSCH. Part 2 CSI may be omitted starting from the lowest priority level up to the Part 2 CSI coding rate that is less than or equal to the coding rate set by the higher layer parameter (e.g., maxCodeRate).

[0210] Additionally, if the CQI request (or CSI request) field in the DCI triggers CSI report(s) on the PUSCH, the first uplink symbol carrying the CSI report(s) may not precede a symbol specified after a certain interval from the last symbol of the PDCCH carrying the corresponding DCI. Accordingly, the CSI calculation time may be guaranteed. For example, if multiple sub-configurations are configured for the CSI report, the starting position of the aforementioned certain interval may be determined based on all triggered sub-configurations.

[0211] CSI is transmitted via PUCCH or PUSCH and can be expressed as a bit string of a fixed size. When CSI is transmitted via PUCCH, if a parameter (e.g., csi-ReportSubConfig) indicating sub-configuration-specific settings for CSI reports is configured, the mapping order of CSI fields for each CSI sub-report can be applied according to predefined rules.

[0212] When CSI is transmitted via PUSCH, if a parameter indicating sub-configuration-specific configuration for CSI reporting (e.g., csi-ReportSubConfig) is set, for each CSI sub-report, the mapping order of CSI fields can be applied according to a predefined rule.

[0213] Some or all of the examples of FIGS. 1 to 15 described above may be combined with some or all of the examples of the present disclosure described below, and such combined examples are included within the scope of the present disclosure.

[0214] Terminal-initiated / triggered reporting or event-based / triggered reporting

[0215] In describing the present disclosure, " / " means "and", "or", or "and / or" depending on the context. In addition, "beam" in the present disclosure may mean a source RS for a "spatial filter" or a "spatial relationship", and may be interpreted as a QCL (type-D) RS, a (DL / UL / joint) TCI state, or (in the case of uplink) a spatial relationship RS.

[0216] In wireless communication systems, Layer-1 (e.g., physical layer)-based uplink control information has the advantage of shorter transmission delay compared to higher-layer-based control information. For example, when a terminal transmits information to a base station via a MAC-CE or RRC message, the terminal may require an SR procedure and the base station's PUSCH allocation procedure (based on the SR), resulting in delay and overhead. Furthermore, higher-layer information generally requires longer decoding time (e.g., decoding time and / or processing time).

[0217] On the other hand, in order to transmit layer-1 based uplink control information, UL physical channel resources (e.g., PUCCH, PUSCH) must be (preliminarily) set / allocated to the corresponding terminal. Therefore, from the base station / network's perspective, as the number of terminals increases, the amount of UL resources to be allocated to each terminal may increase, and the overall UL resource overhead burden may increase accordingly.

[0218] Accordingly, in a wireless communication system, information that must be transmitted relatively urgently for the operation of the physical layer, etc. (e.g., SR (e.g., SR for PUSCH allocation), HARQ-ACK (e.g., HARQ-ACK for retransmission), CSI (e.g., CSI for scheduling / MCS / precoder decision), beam information (e.g., beam information for (analog) beam decision) can be transmitted and received as physical layer UCI.

[0219] Here, the base station and / or the network can determine / control the reporting timing of HARQ-ACK, CSI, beam information, etc., excluding SR. If this NW (network)-initiated / triggered reporting procedure is applied, there is a limitation that in an environment where the wireless channel condition is likely to change rapidly / highly, the reporting timing must be set / instructed so that the terminal can transmit UCI frequently.

[0220] That is, in an environment where the wireless channel conditions change rapidly, the UL resource overhead for UCI reporting and the related DL measurement RS overhead may increase, and there may also be a problem that the power consumption of the terminal increases due to the frequent UL transmission of the terminal. Additionally or alternatively, the UL resource overhead may increase as the number of terminals within the cell / TRP coverage increases, as each terminal must be allocated UL resources.

[0221] To overcome the limitations of these NW-initiated / triggered reports, UE-initiated / triggered reporting schemes or event-based / triggered reporting schemes may be applied.

[0222] When UE-initiated / triggered reporting or event-based / triggered reporting is applied, the terminal can determine whether and when to report (e.g., UCI). That is, the terminal can perform the (UCI) reporting only when necessary (e.g., only when a specific event occurs). This can reduce UL resource overhead and terminal power consumption. Furthermore, since the terminal reports information based on Layer 1 / lower layers, faster reporting can be achieved.

[0223] Accordingly, standardization of UE-initiated / triggered beam reporting methods may be pursued in next-generation wireless communication systems.

[0224] Additionally, for efficient operation of UL resources in next-generation wireless communication systems, UE-initiated / triggered or event-based transmission schemes may be specifically applied to control information, transport blocks (TBs), and user-plane data transmission procedures transmitted via UCI and / or MAC-CE.

[0225] In a wireless communication system, event-based or terminal-initiated / triggered schemes may include scheduling request (SR) and beam failure recovery (BFR) reporting schemes. The terminal may report whether a PUSCH is allocated for UL-SCH transmission via SR, and may report whether a beam failure recovery (BF) has occurred and new beam-related information via BFR. The above-described information may be transmitted to the base station explicitly or implicitly (e.g., by conveying a new beam index as PRACH resource selection information). Additionally or alternatively, the above-described information may be transmitted to the base station all at once or in parts via one or more UL resources. For example, the terminal may transmit a BFRQ to the base station via a PUCCH and report beam information to the base station via a MAC CE on the PUSCH.

[0226] In describing the present disclosure, information (e.g., SR, BFRQ, new beam information) transmitted to the network via an event-based and / or terminal-initiated / triggered transmission method of a terminal is collectively referred to as “event information” or “information about an event.”

[0227] CSI reporting methods supported in basic wireless communication systems may include network-initiated / triggered reporting. As wireless communication systems evolve, higher-precision CSI reporting is supported. However, this higher precision / granularity increases the amount of CSI information to be transmitted simultaneously. Consequently, the size of the UL resources (e.g., PUCCH / PUSCH) required for CSI reporting also increases.

[0228] Hereinafter, an event-based (or terminal-initiated / triggered) CSI reporting method for solving the above-described problems of the present disclosure will be described.

[0229] FIG. 16 is a flowchart illustrating a method performed by a terminal according to one embodiment of the present disclosure.

[0230] The terminal can receive first configuration information related to channel state information (CSI) reporting from the base station (S1610).

[0231] As an example of the present disclosure, the first configuration information may include at least one of information related to a threshold value and information related to a second parameter. Here, the threshold value may collectively refer to a reference value for determining whether an event has occurred (e.g., a reference value for determining whether a condition related to the occurrence of an event has been satisfied). The information about the threshold value may include the size of the threshold value for each type of the first parameter related to the first CSI (e.g., CSI acquired by the terminal for determining whether an event has been triggered / occurred). In addition, the second parameter may collectively refer to at least one parameter related to the reference CSI (e.g., the second CSI).

[0232] Additionally or alternatively, the first configuration information may include information related to at least one event (e.g., the type of the at least one event, etc.) and / or information regarding a trigger condition of the at least one event for transmission of the first CSI. For example, the at least one event trigger condition may include a condition related to whether a difference value between a first parameter and a second parameter related to the first CSI is greater than or equal to a threshold value.

[0233] Additionally or alternatively, at least one event trigger condition may include a condition related to whether the value of the first parameter associated with the first CSI is greater than or equal to a threshold value. In this case, the threshold value that serves as a reference for the difference value between the first parameter and the second parameter and the threshold value that serves as a reference for the value of the first parameter associated with the first CSI may be different from each other, but may also be set to the same value.

[0234] Additionally or alternatively, the first configuration information may include information about at least one of a first uplink (UL) resource for indicating that the first CSI will be transmitted or a second UL resource for transmitting the first CSI.

[0235] As an example of the present disclosure, the first configuration information may be transmitted from the base station to the terminal via upper layer signaling (e.g., system information, an RRC message, etc.). Additionally, at least one of information related to the threshold described above, information related to the second parameter, information related to a trigger condition of at least one event, information related to the first UL resource, or information related to the second UL resource may be transmitted to the terminal via the first configuration information (e.g., the same RRC message), but is not limited thereto.

[0236] For example, at least one of information related to a threshold, information related to a second parameter, information related to a trigger condition of at least one event, information related to a first UL resource, or information related to a second UL resource may be transmitted from the base station to the terminal via a separate RRC message (or configuration information).

[0237] Prior to step S1610, the terminal may transmit to the base station terminal capability information related to at least one event for CSI transmission supported by the terminal. In other words, the terminal may transmit to the base station terminal capability information related to an event-based CSI transmission procedure supported by the terminal.

[0238] The terminal can receive a first CSI-reference signal (RS) from the base station (S1620).

[0239] For example, the terminal may receive second configuration information related to CSI-RS resources from the base station. The terminal may receive a first CSI-RS from the base station based on the second configuration information. The terminal may generate a first CSI based on the first CSI-RS. For example, the second configuration information may be transmitted from the base station to the terminal together with the first configuration information (e.g., via higher layer signaling (e.g., RRC message, etc.)). However, this is merely an embodiment, and the terminal may receive the first configuration information and the second configuration information from the base station via separate higher layer signaling.

[0240] Based on the difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, the terminal can transmit the first CSI to the base station (S1630).

[0241] For example, assume that at least one event trigger condition includes a condition related to whether a difference value between a first parameter and a second parameter is greater than or equal to a threshold value. If the difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS is greater than or equal to the threshold value, an event may be determined to have occurred / triggered. As the event has occurred / triggered, the terminal may transmit the first CSI to the base station.

[0242] For example, a terminal may perform an event-based first CSI reporting operation based on first configuration information. Information related to a second parameter in the first configuration information may include a type of second CSI related to the second parameter.

[0243] For example, the type of the second CSI may be at least one of: i) reference CSI set by the base station, ii) CSI most recently transmitted by the terminal, and iii) CSI transmitted within the first time window or the first frequency window. That is, the second CSI, which the terminal compares with the first CSI to determine whether an event has occurred, may be set by the base station. However, this is only an example, and the second CSI, which the terminal compares with the first CSI to determine whether an event has occurred, may also be predefined.

[0244] Here, the CSI most recently transmitted by the terminal may be CSI reported by the terminal based on the occurrence of an event (e.g., event-based reported CSI) or CSI reported by the terminal according to the settings or instructions of the base station (e.g., network-initiated / triggered CSI).

[0245] As an example of the present disclosure, the first parameter may include a first coefficient of each of at least one of a first frequency domain (FD) basis vector, a first time domain (TD) basis vector, or a first spatial domain (SD) basis vector associated with the first CSI. And, the second parameter may include a second coefficient of each of at least one of a second FD basis vector, a second TD basis vector, or a second SD associated with the second CSI.

[0246] That is, when the difference between the coefficient of the first FD / TD / SD associated with the first CSI and the coefficient of the second FD / TD / SD associated with the second CSI exceeds a threshold, an event occurs / triggered, and accordingly, the terminal can transmit the first CSI to the base station.

[0247] In another example of the present disclosure, the first parameter may include at least one of a first rank indicator (RI) value, a first channel quality indicator (CQI) value, or a first layer indicator (LI) value included in the first CSI. The second parameter may include at least one of a second RI value, a second CQI value, or a second LI value included in the second CSI.

[0248] That is, when the difference between the first LI / CQI / RI value associated with the first CSI and the second LI / CQI / RI value associated with the second CSI exceeds a threshold, an event occurs / triggered, and accordingly, the terminal can transmit the first CSI to the base station.

[0249] In describing the present disclosure, threshold values ​​may be set differently depending on the type of parameter used to determine whether an event has occurred / triggered. For example, if the parameters used to determine whether an event has occurred / triggered are coefficients of LI, CQI, RI, and FD / TD / SD, threshold values ​​may be set / defined differently depending on the coefficients of LI, CQI, RI, and FD / TD / SD.

[0250] For example, if the difference between the first LI value associated with the first CSI and the second LI value associated with the second CSI exceeds a first threshold, the terminal may transmit the first CSI to the base station. In another example, if the difference between the first RI value associated with the first CSI and the second RI value associated with the second CSI exceeds a second threshold, the terminal may transmit the first CSI to the base station. In this case, the first threshold and the second threshold may be set to different values.

[0251] As an example of the present disclosure, a parameter for determining whether an event has occurred / triggered may be configured as a combination of at least one of coefficients of LI, CQI, RI, and FD / TD / SD. That is, the terminal may monitor a difference between at least one of coefficients of LI, CQI, RI, and FD / TD / SD associated with each of the first CSI and at least one of coefficients of LI, CQI, RI, and FD / TD / SD associated with each of the second CSI, and may determine whether an event has occurred (e.g., whether CSI has been transmitted) by comparing the difference value with a threshold value.

[0252] As an example of the present disclosure, the terminal may transmit the first CSI to the base station through uplink control information (UCI) or a medium access control (MAC)-control element (CE) based on a second UL resource. For example, the terminal may transmit information to the base station through the first UL resource to indicate that the first CSI will be transmitted. Then, the terminal may transmit the first CSI to the base station based on the second UL resource.

[0253] As an example of the present disclosure, a terminal may transmit the first CSI to the base station based on a condition that a difference value between a first parameter and a second parameter related to the first CSI based on the first CSI-RS within a second time window is greater than or equal to a threshold value. That is, the terminal may transmit the first CSI to the base station when an event-related condition is satisfied within a specific time period.

[0254] The method described in the example of FIG. 16 may be performed by the first device (200) of FIG. 3. For example, one or more processors (202) of the first device (200) of FIG. 3 may receive first configuration information related to CSI reporting from a base station through one or more transceivers (206). The one or more processors (202) may receive a first CSI-RS from the base station through one or more transceivers (206). Based on a difference value between a first parameter and a second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, the one or more processors (202) may transmit the first CSI to the base station through one or more transceivers (206).

[0255] Furthermore, one or more memories (204) of the first device (200) may store instructions for performing the method described in the example of FIG. 16 or the examples described below when executed by one or more processors (202).

[0256] FIG. 17 is a flowchart illustrating a method performed by a base station according to one embodiment of the present disclosure.

[0257] The base station may transmit first configuration information related to CSI reporting to the terminal (S1710). An example related to the first configuration information has been described with reference to FIG. 16, so any redundant description will be omitted.

[0258] The base station may receive terminal capability information from the terminal related to at least one event for CSI transmission supported by the terminal. The base station may transmit first configuration information to the terminal based on the terminal capability information, but is not limited thereto.

[0259] The base station can transmit the first CSI-RS to the terminal (S1720).

[0260] Based on the difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, the base station can receive the first CSI from the terminal (S1730).

[0261] That is, based on the conditions of an event related to the first / second CSI being met, the base station can receive the first CSI from the terminal. The difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS, the threshold value and / or the event occurrence condition, etc. can be set for the terminal by the base station through the first configuration information.

[0262] The method described in the example of FIG. 17 may be performed by the first device (200) of FIG. 3. For example, one or more processors (202) of the first device (200) of FIG. 3 may transmit first configuration information related to CSI reporting to a terminal via one or more transceivers (206). The one or more processors (202) may transmit a first CSI-RS to the terminal via one or more transceivers (206). Based on a difference value between a first parameter and a second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, the one or more processors (202) may receive the first CSI from the terminal via one or more transceivers (206).

[0263] Furthermore, one or more memories (204) of the first device (200) may store instructions for performing the method described in the example of FIG. 17 or the examples described below when executed by one or more processors (202).

[0264] Below, we will specifically describe the CSI reporting conditions related to event-based CSI reporting (e.g., definition of an event and / or reporting trigger conditions, etc.).

[0265] Example 1

[0266] Embodiment 1 relates to a method / condition for triggering / performing CSI reporting only when a change (above a certain difference / level) occurs compared to the reference CSI. For example, if the difference value (or predefined information / value / level) between the acquired CSI and the reference CSI exceeds a threshold, the terminal may report the acquired CSI. In other words, Embodiment 1 relates to information about an event related to CSI reporting and / or trigger conditions for the event.

[0267] Here, the reference CSI may be replaced / expressed as the default CSI, etc. The reference CSI may include the CSI instructed / designated / set by the base station or the CSI defined according to rules. For example, the rule-defined CSI may include the CSI that most recently performed an event-based reporting operation, the CSI reported according to the most recently network-initiated / triggered procedure, and / or the CSI reported according to the event-based and / or network-initiated / triggered procedure that is filtered / averaged within a certain time / frequency window.

[0268] CSI may include, but is not limited to, PMI, RI, CQI, etc. CSI may also include other forms of information / indications that can represent / indicate channel conditions. For example, CSI may include analog feedback, explicit feedback (e.g., information related to the covariance matrix), and / or direct quantization of the channel with respect to coefficient(s).

[0269] Example 1-1

[0270] In one embodiment of the present disclosure, when there is a change in a frequency / time / space reference vector / matrix / basis related to PMI or MIMO channel-related information (e.g., covariance matrix for explicit feedback), the terminal may perform a CSI reporting operation.

[0271] In basic wireless communication systems, a method of compressing CSI in the spatial domain (e.g., spatial domain (SD) compression) can be applied for efficient transmission of CSI. When NR Type 1 PMI is applied, PMI can be expressed with low overhead by selecting a dominant SD vector constituting the corresponding channel through SD basis selection. When NR Type 2 PMI is applied, the present invention relates to a method of expressing PMI more precisely through a dominant SD basis by enabling selection and synthesis of multiple SD vector(s).

[0272] Additionally, methods for compressing CSI based on the frequency domain as well as the spatial domain (e.g., frequency domain (FD) compressed CSI) and methods for compressing CSI based on the time domain (e.g., time domain (TD) compressed CSI) may be applied. By applying the above-described methods, CSI can be efficiently compressed by expressing spatial, frequency, and temporal information constituting CSI according to a small number of (dominant) SD / FD / TD basis(s). CSI can be expressed based on information related to the above-described basis(s) and coefficient information to be applied to the basis(s).

[0273] As an example of the present disclosure, when there is a change in the SD / FD / TD base(s), the terminal may report CSI to the base station. For example, a change related to the SD / FD / TD base(s) may be defined as an event, and when the event occurs, the terminal may transmit CSI to the base station.

[0274] For example, changes related to SD / FD / TD base(s) may be determined based on reference CSI (e.g., the most recently transmitted CSI). For example, if there is a difference between information about SD / FD / TD base(s) included in CSI acquired by the terminal and information about SD / FD / TD base(s) included in reference CSI (e.g., the most recently transmitted CSI) (i.e., if an event occurs), the terminal may report CSI to the base station.

[0275] Additionally or alternatively, if the coefficient(s) to be applied to the SD / FD / TD base(s) change by a certain level or more (even if there is no change in the base(s)), the terminal may report CSI to the base station. At this time, the trigger condition of the event may be set / defined as whether the change value of the coefficient(s) to be applied to the SD / FD / TD base(s) exceeds a specific threshold. For example, if a difference between the coefficients to be applied to the SD / FD / TD base(s) included in the CSI acquired by the terminal and the coefficients to be applied to the SD / FD / TD base(s) included in the reference CSI exceeds a specific threshold (e.g., if the event condition is satisfied), the terminal may report CSI to the base station.

[0276] For example, if the strongest coefficient indicator (SCI) included in the CSI changes (e.g., in a Type II Codebook (CB)), the UE can report the CSI. In other words, whether or not the SCI associated with the CSI changes can be set / defined as an event condition. For example, if the SCI associated with the CSI acquired by the UE changes compared to the reference CSI (e.g., if an event occurs), the UE can report the CSI to the base station.

[0277] Example 1-2

[0278] In one embodiment of the present disclosure, if a CQI value fluctuates (above a certain level), the terminal may perform a CSI reporting operation. For example, the event trigger condition may include a condition related to whether the CQI value is below or equal to a specific threshold, and / or a condition related to whether the difference between a reference CQI value (e.g., a CQI included in the reference CSI) and a CQI value acquired by the terminal is greater than or equal to a predefined / set value.

[0279] For example, if the difference between the reference CQI value and the CQI value acquired by the terminal is greater than or equal to a predefined / set value, an event may be triggered and the terminal may perform a CSI reporting operation including the CQI.

[0280] Additionally or alternatively, the predefined / set thresholds applied to the cases where the difference between the reference CQI value and the CQI value acquired by the terminal is negative and positive may be different, respectively. For example, when the CQI value acquired by the terminal is greater than the reference CQI value, if the difference between the acquired CQI value and the reference CQI value is greater than or equal to a first threshold value, the terminal may perform a CSI reporting operation. For example, when the CQI value acquired by the terminal is less than the reference CQI value, if the difference between the reference CQI value and the acquired CQI value is greater than or equal to a second threshold value, the terminal may perform a CSI reporting operation. In this case, the first threshold value and the second threshold value may be different values, but may also be the same value.

[0281] Example 1-3

[0282] In one embodiment of the present disclosure, if the RI value fluctuates (above a certain level), the terminal may perform an RI reporting operation. For example, the event trigger condition may include a condition related to whether the RI value is below or equal to a certain threshold, and / or a condition related to whether the difference between a reference RI value (e.g., RI included in reference CSI) and an RI value acquired by the terminal is greater than or equal to a predefined / set value.

[0283] For example, if the difference between the reference RI value and the RI value acquired by the terminal is greater than or equal to a predefined / set value, an event may be triggered and the terminal may perform a CSI reporting operation including the RI.

[0284] Additionally or alternatively, the predefined / set thresholds applied to the cases where the difference between the reference RI value and the RI value acquired by the terminal is negative and positive may be different, respectively. For example, if the RI value acquired by the terminal is greater than the reference RI value, and the difference between the acquired RI value and the reference RI value is equal to or greater than a third threshold value, the terminal may perform a CSI reporting operation. For example, if the RI value acquired by the terminal is less than the reference RI value, and the difference between the reference RI value and the acquired RI value is equal to or greater than a fourth threshold value, the terminal may perform a CSI reporting operation. In this case, the third threshold value and the fourth threshold value may be different values, but may also be the same value.

[0285] Example 1-4

[0286] In one embodiment of the present disclosure, when there is a change in the (strongest) layer indicator (LI), the terminal may perform a CSI reporting operation. For example, the event trigger condition may include a condition related to whether there is a difference between a reference (strongest) LI (e.g., an LI included in the reference CSI) and the (strongest) LI included in the current CSI, a condition related to whether the (strongest) layer has changed, and / or a condition related to whether the LI included in the current CSI is a specific value.

[0287] For example, if there is a difference between the (strongest) reference LI (e.g., LI included in the reference CSI) and the (strongest) LI included in the current CSI, the terminal may perform an (event-based) CSI reporting operation. As another example, if the LI included in the current CSI is a specific value, the terminal may perform an (event-based) CSI reporting operation.

[0288] Additionally or alternatively, if the RI value exceeds 2, such as for PTRS port mapping, the terminal may perform an operation of selecting and reporting a layer with superior quality. As described above, if a change in LI occurs, the base station may perform a specific operation (e.g., changing PTRS port mapping), which may trigger an event-based report from the terminal.

[0289] Example 1-5

[0290] In one embodiment of the present disclosure, a CSI reporting operation can be performed when a change occurs in an RS (set) indicator (e.g., CRI) selected / reported by a terminal.

[0291] The base station can configure multiple RS (sets) for the terminal for multiple beam / TRP related operations. In addition, the base station can configure / instruct the terminal to report CSI (e.g., CSI including PMI / CQI / RI, etc.) related to an RS (set) with superior / inferior quality or preferred / dispreferred by the terminal among the multiple RS (sets). For example, the selection of an RS (set) with superior / inferior quality or preferred / dispreferred by the terminal among the multiple RS (sets) may be performed by the terminal and / or the base station.

[0292] At this time, a change in the RS (set) indicator selected / reported by the terminal may be accompanied by a change in the beam / TRP. Accordingly, if a change occurs in the RS (set) indicator selected / reported by the terminal, the terminal's event-based CSI reporting operation may be performed.

[0293] For example, the RS may include not only a DL RS but also an UL RS. If the RS is a DL RS, when there is a change in an uplink beam / panel selected / preferred by the terminal (e.g., compared to a reference CSI) or / and an uplink beam / panel associated with the terminal, the terminal may trigger an event-based CSI reporting operation. Here, the RS (set) indicator may be expressed as another type of indicator, such as a beam indicator, a TRP indicator, or a DL / UL panel indicator.

[0294] Example 1-6

[0295] In one embodiment of the present disclosure, the CSI may include wideband (WB) CSI and / or subband (SB) CSI.

[0296] For example, an event-based CSI reporting action may be triggered based on a change in wideband CSI. That is, the trigger condition for an event may include a condition related to a change in wideband CSI.

[0297] Additionally or alternatively, the terminal may measure / verify a variation of CSI based on specific SB(s) configured / designated by the base station or specific SB(s) that are prescribed (e.g., center SB(s) of BWP / CC / scheduled BW / CSI-RS BW, every Nth SB of BWP / CC / scheduled BW / CSI-RS BW, etc.). That is, the trigger condition of the event may include a condition related to a variation of CSI based on the specific SB(s). For example, when a variation of CSI exists based on the specific SB(s) or the variation value is greater than or equal to a predefined / configured value, an event may be triggered and the terminal may perform a CSI reporting operation.

[0298] Additionally or alternatively, events may be defined based on specific FD / TD / SD basis(s).

[0299] For example, the terminal may measure / verify the variation of CSI based on specific FD / TD / SD base(s) set / designated by the base station or specific FD / TD / SD base(s) that are prescribed (e.g., reference base(s), strongest N base(s)). The terminal may trigger event-based reporting based on the variation of the corresponding CSI.

[0300] As an example of the present disclosure, from an event definition perspective, if a change occurs only in a specific SB or FD / TD / SD base(s), a related event may be defined separately. Additionally or alternatively, CSI may be configured for the SB or FD / TD / SD base(s) associated with the information reported as a single event.

[0301] An event may be defined / configured by combining conditions described in at least one of Embodiments 1-1, 1-2, 1-3, 1-4, 1-5, and 1-6. For example, an event may be configured based on Embodiment 1-1 (e.g., a condition related to whether a change in a basis constituting a PMI has occurred) and Embodiment 1-2 (e.g., a condition related to whether a change in a CQI value has occurred). In addition, when the condition related to whether a change in a basis constituting a PMI has occurred and the condition related to whether a change in a CQI value has occurred are satisfied, an event may be triggered, and accordingly, the terminal may perform a CSI reporting operation.

[0302] Example 2

[0303] Example 2 relates to an event-based CSI reporting procedure.

[0304] Errors in channel-related measurements of a terminal may occur, and wireless channels may momentarily fluctuate and then recover. Accordingly, as an example of the present disclosure, a terminal's CSI reporting procedure may be configured / defined to be triggered when a condition related to an event (or an event instance) is met a certain number of times within a certain period of time (or when an event occurs a certain number of times within a certain period of time).

[0305] Additionally or alternatively, the terminal may obtain accumulated measurement values ​​over a certain period of time / number of times by applying filtering / averaging to measurement values ​​that determine an event (e.g., at least one numerical value included in the CSI). Based on the accumulated measurement values ​​over a certain period of time / number of times, the terminal may determine whether an event has occurred (or whether a condition related to an event has been met).

[0306] The period / time point for checking the above event (instance) may be defined / set by a value related to the period / transmission time point of the related RS, the reporting period / time point, or / and the coherence time of the wireless channel.

[0307] Additionally or alternatively, the base station may configure / instruct the terminal regarding information about events related to (CSI) reporting (e.g., the type of event related to the report). That is, the base station may configure / instruct the terminal regarding which events to perform reporting. To this end, the terminal may report information about events supported by the terminal and / or event-based reporting operations to the base station (via terminal capability information).

[0308] Additionally or alternatively, with respect to the definition of an event or the trigger conditions for reporting, event-based reporting may be defined or set by the base station not to be performed by the terminal if network-initiated / triggered CSI reporting is performed within a certain time period and / or network-initiated / triggered CSI reporting is activated / triggered.

[0309] For example, if a related aperiodic CSI report is triggered within a certain time period (or recently), or if a semi-static CSI report is activated (at a rate faster than the scheduled reporting cycle), event-based CSI reporting may not be necessary from the base station's perspective. Therefore, the event-based report can be regulated / configured to not be triggered (or canceled).

[0310] Additionally or alternatively, the base station may set non-trigger conditions or cancellation conditions related to the above-described event-based reporting for the terminal, or non-trigger conditions or cancellation conditions related to the event-based reporting may be defined.

[0311] The event-based CSI reporting described in this disclosure can be performed via UCI or MAC-CE. That is, when an event is triggered / occurred, the terminal can transmit UCI or MAC-CE containing CSI to the base station.

[0312] For example, when CSI is reported to the base station via UCI or MAC-CE, if UL resources (e.g., available UL SCH) for transmitting the UCI or MAC-CE are not allocated to the UE, the UE may transmit a scheduling request (SR) to the base station for allocation of the UL resources. That is, the UE may request PUSCH / PUCCH resource allocation to the base station.

[0313] Additionally or alternatively, the base station may pre-configure / allocate UL resources (e.g., PUSCH resources and / or PUCCH resources) for event-based reporting to the UE. When performing UCI / MAC-CE-based CSI reporting via these UL resources, the base station may need to constantly monitor these UL resources, as the UE may perform CSI reporting via these UL resources at any time.

[0314] To reduce or eliminate the above-described burden, the terminal may notify the base station in advance that the transmission operation based on the UL resource (e.g., UL resource for UCI / MAC-CE transmission) will be performed through a separate UL resource (e.g., short PUCCH, SR PUCCH, PRACH, etc.) (with small overhead). That is, before performing the CSI reporting operation through UCI / MAC-CE, the terminal may transmit separate information to the base station notifying that the CSI reporting will be performed.

[0315] In describing the present disclosure, the separate resource for transmitting separate information indicating that the corresponding CSI report will be performed is collectively referred to as the first resource, and the resource for performing the corresponding CSI report is collectively referred to as the second resource. The first resource may be a PUSCH, PUCCH, or PRACH resource (capable of transmitting information of 1 to several bits). The second resource may be a PUCCH (capable of transmitting information of several tens of bits or more) or a PUSCH resource (configured grant or semi-persistent CSI).

[0316] As described above, the first resource is not necessarily required, and if there is no burden on the base station's UL resource monitoring or / and the amount of the second resource is not large, the base station can transmit CSI to the terminal using only the second resource.

[0317] Event-based CSI reporting via the first resource and / or the second resource is merely an example of the present disclosure and is not limited thereto. Other forms of event-based CSI reporting operations may be performed.

[0318] FIG. 18 is a diagram for explaining a signaling procedure of a network side and a terminal according to one embodiment of the present disclosure.

[0319] FIG. 18 illustrates an example of signaling between a network side and a terminal (UE) in an M-TRP situation to which the examples of the present disclosure described above (e.g., one or more combinations of Embodiment 1, Embodiment 1-1, Embodiment 1-2, Embodiment 1-3, Embodiment 1-4, Embodiment 1-5, Embodiment 1-6, Embodiment 2 or / and detailed embodiments thereof) may be applied.

[0320] Here, the UE / network side is exemplary and can be replaced with various devices as described with reference to FIG. 3. FIG. 18 is provided for convenience of explanation and does not limit the scope of the present disclosure. Furthermore, some of the steps shown in FIG. 18 may be omitted depending on the situation and / or settings. Furthermore, in the operation of the network side / UE of FIG. 18, the aforementioned uplink transmission / reception operations, M-TRP-related operations, etc. may be referenced or utilized.

[0321] In the following description, the network side may be a single base station including multiple TRPs, or a single cell including multiple TRPs. Alternatively, the network side may include multiple remote radio heads (RRHs) / remote radio units (RRUs).

[0322] For example, ideal / non-ideal backhauls can be established between TRP 1 and TRP 2, which constitute the network side. Furthermore, while the following description is based on multiple TRPs, it can be equally extended to transmissions through multiple panels / cells, and can also be extended to transmissions through multiple RRHs / RRUs, etc.

[0323] In addition, although the following description is based on "TRP", as described above, "TRP" can be replaced and applied with expressions such as panel, antenna array, cell (e.g., macro cell / small cell / pico cell, etc.), transmission point (TP), base station (gNB, etc.). As described above, TRP can be distinguished according to information about CORESET group (or CORESET pool) (e.g., CORESET index, ID).

[0324] For example, if a single terminal is configured to transmit and receive with multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for the single terminal. The configuration of such CORESET groups (or CORESET pools) can be performed via higher-layer signaling (e.g., RRC signaling).

[0325] Additionally, a base station may be a general term for an object that transmits and receives data with a terminal. For example, the base station may be a concept that includes one or more Transmission Points (TPs), one or more Transmission and Reception Points (TRPs), etc. Furthermore, the TPs and / or TRPs may include a panel of the base station, a transmission and reception unit, etc.

[0326] The terminal may receive configuration information related to event-based CSI reporting from the network (S110). For example, the configuration information may include configuration information related to an event (e.g., information about event conditions, thresholds related to event conditions, etc.), configuration information for CSI reporting, information related to the configuration of CSI, and / or configuration information related to UL channel resources (e.g., PUCCH, PUSCH, etc.) for CSI reporting. Additionally or alternatively, the configuration information may include configuration information related to CSI reporting as described with reference to FIG. 15.

[0327] Prior to step S110, the terminal may transmit terminal capability information, which includes information about CSI-related event(s) supported by the terminal, to the network. Specifically, the terminal may transmit to the network, through the terminal capability information, the types of CSI-related events it supports, information related to event-based CSI, and the like. Configuration information related to event-based CSI reporting may be based on, but is not limited to, the terminal capability information transmitted by the terminal.

[0328] As an example of the present disclosure, the configuration information may include configuration information according to the examples of the present disclosure (e.g., Embodiment 1, Embodiment 1-1, Embodiment 1-2, Embodiment 1-3, Embodiment 1-4, Embodiment 1-5, Embodiment 1-6, Embodiment 2 or / and a combination of one or more of the detailed embodiments thereof). In addition, the configuration information may be transmitted from the base station to the terminal via upper layer signaling (e.g., system information, RRC message, MAC CE, etc.).

[0329] The terminal can monitor whether an event has occurred based on the configuration information described above (S115). For example, the terminal can receive an RS (e.g., a CSI-RS) from the network and acquire CSI based on the received RS. The terminal can monitor whether the acquired CSI satisfies the conditions associated with the event.

[0330] When an event occurs, the terminal can transmit CSI information to the base station via UL resources (S120). That is, if an event-related condition is met, an event-based reporting operation can be triggered. That is, the terminal can transmit CSI to the base station based on the UL resources (e.g., the first UL resource and / or the second UL resource) configured by the configuration information.

[0331] The embodiments described above are combinations of components and features of the present disclosure in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form embodiments of the present disclosure by combining some components and / or features. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form embodiments or incorporated as new claims through post-application amendments.

[0332] It will be apparent to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the essential characteristics thereof. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present disclosure are intended to be included within the scope of the present disclosure.

[0333] The scope of the present disclosure includes software or machine-executable instructions (e.g., an operating system, an application, firmware, a program, etc.) that cause operations according to the methods of various embodiments to be executed on a device or a computer, and a non-transitory computer-readable medium having such software or instructions stored thereon and executable on the device or computer. Instructions that can be used to program a processing system to perform the features described in the present disclosure can be stored on / in a storage medium or a computer-readable storage medium, and a computer program product including such a storage medium can be used to implement the features described in the present disclosure. The storage medium can include, but is not limited to, high-speed random access memory, such as DRAM, SRAM, DDR RAM, or other random access solid state memory devices, and can include non-volatile memory, such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid state storage devices. The memory optionally includes one or more storage devices remotely located from the processor(s). The memory or, alternatively, the non-volatile memory device(s) within the memory comprise a non-transitory computer-readable storage medium. The features described in this disclosure may be incorporated into software and / or firmware stored on any of the machine-readable media, which may control the hardware of the processing system and allow the processing system to interact with other mechanisms that utilize results according to embodiments of the present disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0334] Here, the wireless communication technology implemented in the device of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. For example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented with standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the device of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology can be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the device (100, 200) of the present disclosure can include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-described names. For example, ZigBee technology can create personal area networks (PAN) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

[0335] The method proposed in this disclosure is explained with a focus on examples applied to 3GPP LTE / LTE-A and 5G systems, but can be applied to various wireless communication systems in addition to 3GPP LTE / LTE-A and 5G systems.

Claims

1. A step of receiving first configuration information related to channel state information (CSI) reporting from a base station by a terminal; A step of receiving a first CSI-reference signal (RS) from the base station by the terminal; and A step of transmitting the first CSI to the base station by the terminal based on a difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, A method wherein the first setting information includes at least one of information related to the threshold value and information related to the second parameter.

2. In paragraph 1, The first setting information includes information on a trigger condition of at least one event for transmission of the first CSI, A method wherein the at least one event trigger condition includes a condition related to whether a difference value between the first parameter and the second parameter is greater than or equal to the threshold value.

3. In paragraph 1, A method in which terminal capability information related to at least one event for CSI transmission supported by the terminal is transmitted from the terminal to the base station.

4. In paragraph 1, Information related to the second parameter includes the type of the second CSI related to the second parameter, A method according to claim 1, wherein the type of the second CSI is at least one of: i) reference CSI set by the base station, ii) CSI most recently transmitted by the terminal, and iii) CSI transmitted within a first time window or a first frequency window.

5. In paragraph 4, A method wherein the CSI most recently transmitted by the terminal is CSI reported by the terminal based on an event occurrence or CSI reported by the terminal according to a setting or instruction of the base station.

6. In paragraph 1, The first parameter includes a first coefficient of at least one of a first frequency domain (FD) basis vector, a first time domain (TD) basis vector, or a first spatial domain (SD) basis vector related to the first CSI, A method wherein the second parameter comprises a second coefficient of at least one of a second FD basis vector, a second TD basis vector, or a second SD associated with the second CSI.

7. In paragraph 1, The first parameter includes at least one of a first rank indicator (RI) value, a first channel quality indicator (CQI) value, or a first layer indicator (LI) value included in the first CSI, A method wherein the second parameter includes at least one of a second RI value, a second CQI value, or a second LI value included in the second CSI.

8. In paragraph 1, A method wherein the first configuration information includes information on at least one of a first uplink (UL) resource for notifying that the first CSI will be transmitted or a second UL resource for transmitting the first CSI.

9. In paragraph 8, A method in which the first CSI is transmitted from the terminal to the base station through uplink control information (UCI) or a medium access control (MAC)-control element (CE) based on the second UL resource.

10. In paragraph 2, A method in which the first CSI is transmitted from the terminal to the base station based on a condition being satisfied regarding whether a difference value between a first parameter and a second parameter related to the first CSI based on the first CSI-RS within a second time window is greater than or equal to a threshold value.

11. In paragraph 1, A method wherein information about the threshold value includes the size of the threshold value for each type of the first parameter.

12. One or more transceivers; and comprising one or more processors connected to said one or more transceivers, One or more of the above processors: Receiving first configuration information related to channel state information (CSI) reporting from a base station through the one or more transceivers; Receiving a first CSI-reference signal (RS) from the base station through the one or more transceivers; and Based on the difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, the first CSI is set to be transmitted to the base station through the one or more transceivers, A terminal wherein the first setting information includes at least one of information related to the threshold value and information related to the second parameter.

13. A step of transmitting first configuration information related to channel state information (CSI) reporting from a base station to a terminal; A step of transmitting a first CSI-reference signal (RS) to the terminal by the base station; and A step of receiving the first CSI from the terminal by the base station based on a difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, A method wherein the first setting information includes at least one of information related to the threshold value and information related to the second parameter.

14. In the base station, the base station: one or more transceivers; and comprising one or more processors connected to said one or more transceivers, One or more of the above processors: Transmitting first configuration information related to channel state information (CSI) reporting to a terminal via one or more transceivers; Transmitting a first CSI-reference signal (RS) to the terminal via the one or more transceivers; and Based on the difference value between the first parameter and the second parameter related to the first CSI based on the first CSI-RS being greater than or equal to a threshold value, the first CSI is set to be received from the terminal through the one or more transceivers, A base station, wherein the first setting information includes at least one of information related to the threshold value and information related to the second parameter.

15. In a processing device configured to control a terminal, the processing device: one or more processors; and A processing device comprising one or more computer memories operatively connected to said one or more processors and storing instructions for performing a method according to any one of claims 1 to 11 based on execution by said one or more processors.

16. One or more non-transitory computer-readable media storing one or more instructions, A computer-readable medium, wherein the one or more commands are executed by one or more processors to control a device to perform a method according to any one of claims 1 to 11.

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