Device and method for reporting channel state information on basis of sub-configurations in wireless communication system

Abstract

The purpose of the present disclosure is to report channel state information (CSI) on the basis of sub-configurations in a wireless communication system, and a method performed by a terminal may comprise the steps of: receiving configuration information for a CSI report comprising a list of a plurality of sub-configurations; and transmitting, to a base station, CSI comprising a measurement result based on at least one CSI-RS related to the CSI report.

Description

Device and method for reporting channel state information based on sub-settings in a wireless communication system

[0001] The following description relates to a wireless communication system, and to a device and method for reporting channel state information (CSI) based on sub-configurations in a wireless communication system.

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

[0003] The 6G system aims to provide (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) low energy consumption for 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.

[0004] The present disclosure relates to an apparatus and method for effectively reporting channel state information (CSI) based on sub-configurations in a wireless communication system.

[0005] The present disclosure relates to a device and method for effectively supporting a network energy saving (NES) operation of a base station in a wireless communication system.

[0006] The present disclosure relates to a device and method for determining a CSI-RS (reference signal) reference resource in a wireless communication system.

[0007] The present disclosure relates to a device and method for determining a CSI-RS reference resource based on sub-settings in a wireless communication system.

[0008] The present disclosure relates to a device and method for treating sub-configurations as a plurality of CSI-RS resources when determining a CSI-RS reference resource in a wireless communication system.

[0009] The present disclosure relates to a device and method for determining settings for CSI reporting in consideration of the capabilities of a terminal in a wireless communication system.

[0010] The present disclosure relates to a device and method for counting the number of CSI-RS resources and ports based on sub-settings in a wireless communication system.

[0011] The present disclosure relates to a device and method for selecting ports to be turned off or on through sub-settings in a wireless communication system.

[0012] The present disclosure relates to a device and method for selecting ports to be turned on or off through sub-settings based on a code division multiplexing (CDM) group in a wireless communication system.

[0013] The present disclosure relates to a device and method for equally determining the number of ports turned on or off between CDM groups arranged on the same time axis in a wireless communication system.

[0014] The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical tasks not mentioned can be considered by a person having ordinary skill in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure described below.

[0015] As an example of the present disclosure, a method performed by a terminal in a wireless communication system may include the steps of receiving configuration information for a channel state information (CSI) report including a list of a plurality of sub-configurations, and transmitting CSI including a measurement result based on at least one CSI-RS related to the CSI report to a base station. The configuration information includes information related to a CSI (channel state information)-RS (reference signal) resource for the CSI report and a plurality of CSI-RS ports, wherein the plurality of sub-configurations are linked to information related to different port-subsets based on the plurality of CSI-RS ports, and the port subsets may be determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

[0016] As an example of the present disclosure, a method performed by a base station in a wireless communication system may include the steps of determining a channel state information (CSI)-reference signal (RS) resource and a plurality of CSI-RS ports for a terminal, determining sub-configurations for the terminal from the plurality of CSI-RS ports using port subsets, and transmitting configuration information for CSI reporting, the configuration information including information related to the port subsets. The port subsets may be determined based on a code division multiplexing (CDM) group of the CSI-RS ports.

[0017] As an example of the present disclosure, a terminal in a wireless communication system includes a transceiver and a processor connected to the transceiver, wherein the processor is configured to receive configuration information for a channel state information (CSI) report including a list of a plurality of sub-configurations, and transmit, to a base station, CSI including a measurement result based on at least one CSI-RS related to the CSI report. The configuration information includes information related to a CSI (channel state information)-RS (reference signal) resource for the CSI report and a plurality of CSI-RS ports, wherein the plurality of sub-configurations are linked to information related to different port-subsets based on the plurality of CSI-RS ports, and the port subsets can be determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

[0018] As an example of the present disclosure, in a wireless communication system, a base station includes a transceiver and a processor connected to the transceiver, wherein the processor is configured to determine channel state information (CSI)-reference signal (RS) resources and a plurality of CSI-RS ports for a terminal, determine sub-configurations for the terminal from the plurality of CSI-RS ports using port subsets, and transmit configuration information for CSI reporting including information related to the port subsets. The port subsets may be determined based on a code division multiplexing (CDM) group of the CSI-RS ports.

[0019] As an example of the present disclosure, a communication device includes at least one processor, and at least one computer memory coupled to the at least one processor and storing instructions that, when executed by the at least one processor, direct operations, wherein the operations may include: receiving configuration information for a channel state information (CSI) report including a list of a plurality of sub-configurations; and transmitting, to a base station, CSI including a measurement result based on at least one CSI-RS related to the CSI report. The configuration information includes information related to a CSI (channel state information)-RS (reference signal) resource for the CSI report and a plurality of CSI-RS ports, wherein the plurality of sub-configurations are linked to information related to different port-subsets based on the plurality of CSI-RS ports, and wherein the port subsets are determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

[0020] As an example of the present disclosure, a non-transitory computer-readable medium storing at least one instruction includes at least one instruction executable by a processor, wherein the at least one instruction can instruct a device to receive configuration information for a channel state information (CSI) report including a list of a plurality of sub-configurations, and to transmit to a base station CSI including a measurement result based on at least one CSI-RS related to the CSI report. The configuration information includes information related to a CSI (channel state information)-RS (reference signal) resource for the CSI report and a plurality of CSI-RS ports, wherein the plurality of sub-configurations are linked to information related to different port-subsets based on the plurality of CSI-RS ports, and the port subsets can be determined based on a code division multiplexing (CDM) group of the CSI-RS ports.

[0021] The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present disclosure to be described below.

[0022] The following effects may be achieved by embodiments based on the present disclosure.

[0023] According to the present disclosure, channel state information (CSI) feedback based on sub-configurations can be effectively performed.

[0024] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects resulting from implementing the configuration described in the present disclosure can also be derived from the embodiments of the present disclosure by those skilled in the art.

[0025] Figure 1 illustrates an example of a flexible network topology applicable to the present disclosure.

[0026] FIG. 2 illustrates an example of the structure of a wireless communication system applicable to the present disclosure.

[0027] FIG. 3 illustrates an example of a wireless device applicable to the present disclosure.

[0028] FIG. 4 illustrates an example of a communication procedure between a first node and a second node applicable to the present disclosure.

[0029] Figure 5 illustrates an example of a general functional architecture related to both functionality-based life cycle management (LCM) and model-based LCM.

[0030] Figure 6 illustrates an example of an operation procedure based on an AI / ML model applicable to the present disclosure.

[0031] Figure 7 illustrates an example of an electromagnetic spectrum applicable to the present disclosure.

[0032] FIG. 8 illustrates an example of a procedure for transmitting system information for THz communication applicable to the present disclosure.

[0033] Figure 9 illustrates an example of a beam management procedure applicable to the present disclosure.

[0034] Figure 10a illustrates an example of a general NTN scenario based on transparent payload applicable to the present disclosure.

[0035] Figure 10b illustrates an example of a general NTN scenario based on a replay payload applicable to the present disclosure.

[0036] Figure 11a illustrates an example of components of the orbital parameter ephemeris (OPE) format.

[0037] Figure 11b shows examples of offsets in links associated with satellites.

[0038] Figure 11c illustrates examples of TA (timing advanced) values ​​in a link associated with a satellite.

[0039] Figures 12a and 12b illustrate examples of sensing operations applicable to the present disclosure.

[0040] FIG. 13 illustrates an example of time / frequency resources for sensing operations applicable to the present disclosure.

[0041] FIG. 14 illustrates an example of a procedure related to a sensing operation applicable to the present disclosure.

[0042] FIG. 15 illustrates an example of an operation procedure of a base station supporting network energy saving (NES) technology applicable to the present disclosure.

[0043] FIG. 16 illustrates an example of a procedure for cell DTX / DRX (discontinuous transmission / discontinuous reception) operation applicable to the present disclosure.

[0044] FIG. 17 illustrates an example of a procedure for measuring and reporting channel state information (CSI) applicable to the present disclosure.

[0045] FIGS. 18A and 18B illustrate examples of configuration information for CSI reporting according to various embodiments of the present disclosure.

[0046] FIGS. 19A to 19R illustrate examples of AP mapping of CSI-RS according to various patterns applicable to the present disclosure.

[0047] FIG. 20 illustrates an example of a procedure for determining a CSI reference resource according to one embodiment of the present disclosure.

[0048] FIG. 21 illustrates an example of a procedure for providing setup information for CSI reporting according to one embodiment of the present disclosure.

[0049] FIG. 22 illustrates an example of a procedure for receiving setup information for CSI reporting according to one embodiment of the present disclosure.

[0050] FIG. 23 illustrates an example of a procedure for providing setup information for CSI reporting according to one embodiment of the present disclosure.

[0051] FIG. 24 illustrates an example of a procedure for transmitting a CSI report according to one embodiment of the present disclosure.

[0052] 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."

[0053] 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."

[0054] 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.”

[0055] 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.”

[0056] Additionally, parentheses used in the present disclosure may mean "for example." Specifically, when "control information (ABC)" is indicated, "ABC" may be described as an example of "control information." For example, "control information" may include DEF as another example. In other words, the "control information" of the present disclosure is not limited to "ABC," and "ABC" may be described as an example of "control information." Furthermore, even when indicated as "control information (i.e., ABC)," "ABC" may be described as an example of "control information."

[0057] Additionally, in the present disclosure, terms such as “first,” “second,” etc. are used only for the purpose of distinguishing 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 limited. Accordingly, a first component in one embodiment of the present disclosure 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.

[0058] In the following explanation, ‘when, if, in case of’ can be replaced with ‘based on’.

[0059] Technical features individually described in one drawing in this disclosure may be implemented individually or simultaneously.

[0060] In the present disclosure, a terminal is a user equipment (UE) or a consumer-side device, and may also be referred to as a base station / second node / IAB (integrated access and backhaul) node / first node that receives / transmits signals from / to a Transmission-Reception Point (TRP). The terminal may correspond to a physical node or a logical node. The terminal may correspond to an endpoint on the user side, or may correspond to an intermediate point between other endpoints. In communication between two points that are not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), the terminal may correspond to a served node. A terminal may be a node with a fixed location, or a node with an unfixed location (or mobile).

[0061] In the present disclosure, a base station (BS) is a device on the network side, and may also be called a second node / IAB node / x-NodeB (x-NodeB, x may be an abbreviation related to a radio access technology (RAT)) / Transmission-Reception Point (TRP). A base station may correspond to a physical node or a logical node. A base station may correspond to an endpoint on the network side, or may correspond to an intermediate point between other endpoints. In communication between two points that are not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a base station may correspond to a serving node. A base station may be a node with a fixed location, or a node with an unfixed location.

[0062] In the present disclosure, higher layer parameters may be set for the terminal, preset, or predefined. For example, the base station may transmit higher layer parameters to the terminal. For example, the terminal may transmit parameters such as capabilities to the base station as higher layer parameters. For example, the higher layer parameters may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0063] In the present disclosure, the information / state / parameter being “configured or pre-configured” can be interpreted as the information / state / parameter being provided / pre-provided to the terminal through pre-defined signaling (e.g., SIB, MAC, RRC) from the base station. In the present disclosure, the information / state / parameter being “defined or pre-defined” can be interpreted as the information / state / parameter being known in advance or pre-stored at the base station and the terminal without signaling between the base station and the terminal.

[0064] The technology described in the present disclosure can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). CDMA can be implemented with wireless technologies such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented with wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), long term evolution (LTE), and 5G NR.

[0065] 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.

[0066] A. 6G network architecture

[0067] Figure 1 illustrates an example of a flexible network topology applicable to the present disclosure.

[0068] 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 IAB nodes, relays, and RF repeaters, as illustrated in the example in Figure 1, may be applied, or NTNs 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, or 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 function of signal amplification and forwarding, while a network-controlled repeater may not only amplify and forward signals but also adjust transmission and reception settings based on information provided by the network. For example, an NTN node may correspond to a satellite or aircraft that provides NTN coverage that is difficult for terrestrial networks to provide. In addition to these examples, various intermediate points can be introduced to improve the network topology.

[0069] 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.

[0070] 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. In other words, 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.

[0071] 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. However, 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), and 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.

[0072] That is, in some examples of the present disclosure, for the sake of simplicity of explanation, the subjects of the operation may be referred to as a base station and / or a terminal (or a first node and / or a second node). In addition, the terms base station and / or terminal (or a first node and / or a second node) may also be interpreted / replaced as in the following examples: For example, the base station (or a first node) and the terminal (or a second node) may respectively correspond to a first endpoint and a second endpoint; may respectively correspond to an endpoint and an intermediate point; may respectively correspond to an intermediate point and an endpoint; or may respectively correspond to a first intermediate point and a second intermediate point.

[0073] In the present disclosure, there may be zero or more intermediate points between the base station and the terminal. If intermediate points exist, they may be IAB nodes / relays / RF repeaters / NTN (non-terrestrial network) nodes, or nodes supporting other functions. The intermediate points may be nodes with fixed locations or nodes with unfixed locations.

[0074] Systems applicable to this disclosure

[0075] FIG. 2 illustrates an example of a structure of a wireless communication system applicable to the present disclosure. The communication system (100) of FIG. 2 applicable 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).

[0076] 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 other IoT devices (e.g., sensors) or other wireless devices (110a to 110f).

[0077] 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.

[0078] Devices applicable to the present disclosure

[0079] FIG. 3 illustrates an example of a wireless device applicable to the present disclosure.

[0080] 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).

[0081] 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.

[0082] 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) including 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.

[0083] 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.

[0084] 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.

[0085] 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. In addition, 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 operation flowcharts disclosed in this document through 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 the processed user data, control information, wireless signals / channels, etc. from baseband signals to RF band signals using at least one processor (202).For this purpose, at least one transceiver (206) may include an (analog) oscillator and / or filter.

[0086] 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).

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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. However, 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 back haul communications, and a wired transceiver may not be included.

[0094] B. Communication Procedures

[0095] FIG. 4 illustrates an example of a communication procedure between a first node (e.g., a terminal) and a second node (e.g., a base station) applicable to the present disclosure. The second node of FIG. 1 supports dynamic spectrum sharing (DSS) to provide connectivity to both nodes implementing 6G technology and nodes implementing pre-6G wireless communication technologies (e.g., 5G, 4G). That is, the first node of FIG. 1 may implement 6G technology or pre-6G wireless communication technologies (e.g., 5G, 4G). In addition, the first node and / or the second node may support a full duplex mode as well as a non-overlapping full duplex mode.

[0096] In Fig. 4, for the sake of simplicity of explanation, the first node and the second node are assumed to be a terminal and a base station, respectively, and operations of transmitting and / or receiving data by the terminal (440) and the base station (420) and operations performed prior thereto are illustrated. However, the operations of Fig. 1 are not limited to operations between the terminal and the base station, and may be interpreted as operations between the first node and the second node. In addition, although Fig. 1 illustrates direct wireless signal transmission and reception operations between the terminal (440) and the base station (420), one or more intermediate points may exist between the terminal (440) and the base station (420), and wireless signals may be transmitted and received via one or more intermediate points.

[0097] Referring to FIG. 4, in step 401, the terminal (440) and the base station (420) perform synchronization. For example, the terminal (440) performs an initial cell search operation. Specifically, the terminal (440) can detect a synchronization signal for connection to at least one base station transmitted from the base station (420) according to a predefined rule. Here, the synchronization signal can include a plurality of synchronization signals classified according to structure or purpose (e.g., a first synchronization signal (e.g., a primary synchronization signal), a second synchronization signal (e.g., a secondary synchronization signal), etc.). Through this, the terminal (440) can confirm the boundary of a unit (e.g., a frame, a subframe, a slot, and / or a symbol) constituting a wireless signal transmission of the base station (420) and obtain information (e.g., a cell identifier) ​​about the base station (420).

[0098] In step 403, the terminal (440) obtains system information transmitted from the base station (420). The system information is information related to the properties, characteristics, and / or capabilities of the base station (420) required to access the base station (420) and use the service, and may be classified according to the content (e.g., whether it is essential for access), transmission structure (e.g., channel used, whether provided on-demand), etc., and may be classified into, for example, first system information (e.g., master information block (MIB), primary system information), second system information (e.g., system information block (SIB), secondary system information), etc. If necessary, the terminal (440) may transmit a signal requesting system information before receiving the system information. However, the request and provision of the system information may be performed after the random access procedure described below.

[0099] In step 405, the terminal (440) and the base station (420) perform a random access procedure. The terminal (440) may transmit and / or receive at least one message (e.g., a random access preamble, a random access response (RAR) message, etc.) for the random access procedure based on information related to a channel for the random access procedure of the base station (420) obtained through system information (e.g., a channel position, a channel structure, a structure of a supported preamble, etc.). For example, the terminal (440) may transmit a first message (e.g., a preamble, MSG1) through the channel for the random access procedure, receive a second message (e.g., an RAR message, MSG2), transmit a third message (e.g., MSG3) including information related to the terminal (440) (e.g., identification information) to the base station (420) using scheduling information included in the second message, and receive a fourth message (e.g., MSG4) for contention resolution and / or connection establishment. As another example, the first and third messages may be sent and received as one message, or the second and fourth messages may be sent and received as one message.

[0100] In step 407, the terminal (440) and the base station (420) perform signaling of control information. Here, the control information may 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 transport 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 (440) and the base station (420) may perform at least one of signaling for establishing a connection, signaling for determining settings related to communication, and signaling for indicating allocated resources.

[0101] In step 409, the terminal (440) and the base station (420) transmit and / or receive data. In other words, the terminal (440) and the base station (420) can process, transmit, and / or receive data based on the signaling of the control information. For example, when transmitting data, the terminal (440) or the base station (420) can perform at least one of channel encoding, rate matching, scrambling, constellation mapping, layer mapping, waveform modulation, antenna mapping, and resource mapping on the information bits. Conversely, when receiving data, the terminal (440) or the base station (420) 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.

[0102] C. 6G System Core Technologies

[0103] As core implementation technologies of the 6G system, technologies such as artificial intelligence (AI), THz (terahertz) communication, optical wireless technology, FSO backhaul network, massive MIMO 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.

[0104] C-1. Artificial intelligence

[0105] 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. This means 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.

[0106] [Functional Framework]

[0107] The following describes a functional framework for AI / ML operations.

[0108] Below, to explain AI (or AI / ML) more specifically, the terms can be defined as follows.

[0109] - Data collection: Data collected from network nodes, management entities, or terminals as a basis for AI model training, data analysis, and inference.

[0110] - 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.

[0111] - 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.

[0112] - AI / ML Inference: The process of making predictions or inducing decisions based on collected data and the AI ​​model using a trained AI model.

[0113] Life Cycle Management (LCM) procedures for AI / ML models (i.e., model training, model deployment, model inference, model monitoring, model updates, etc.) can be divided into functionality-based LCM and model-based LCM. In functionality-based LCM, AI / ML models may not be identified by the network, and the network can direct the activation / deactivation / fallback / switching of AI / ML functionality. In model-ID (identifier)-based LCM, AI / ML models can be identified by the network, and the network / terminal can activate / deactivate / select / switch AI / ML models based on the model ID.

[0114] Figure 5 illustrates an example of a general functional architecture relevant to both Functionality-based LCM and Model-based LCM. Some of the functions or some of the data / information / command flows (i.e., arrows) illustrated in Figure 5 may be omitted.

[0115] Referring to FIG. 5, a general functional framework can be configured to include a data collection function (510), a model training function (520), a management function (530), an inference function (540), and a model storage function (550).

[0116] The Data Collection function (510) is a function that provides input data to the Model Training function (520), Management function (530), and Inference function (540). The Data Collection function (510) can perform data preparation based on raw data and provide input data processed through data preparation. Examples of raw data may include received data / measurement data from terminals or other network entities, inference / output of AI / ML models, etc. The Data Collection function (510) may be performed by a single entity (e.g., a terminal, a network node, etc.) or may be performed by multiple entities.

[0117] Here, training data (511) refers to data required as input for the AI / ML Model Training function (520). Monitoring data (512) refers to data required as input for the AI / ML model or AI / ML function Management (530). Inference data (513) refers to data required as input for the AI / ML Inference function (530).

[0118] The Model Training function (520) performs AI / ML model training, validation, and testing, which can generate model performance metrics that can be used as part of the AI / ML model testing process. If necessary, the Model Training function (520) can perform data preparation (e.g., data pre-processing and cleaning, forming, and transformation) based on the Training Data (511) transmitted from the Data Collection function (510).

[0119] Trained / Updated Model (521): If there is a Model Storage function (550), it is used to pass a trained, validated and tested AI / ML model to the Model Storage function (550) or to pass an updated version of the model to the Model Storage function (550).

[0120] The Management function (530) is a function that supervises the operation of the AI / ML model or AI / ML function. In addition, the Management function (530) may perform decisions to ensure appropriate inference operations based on data received from the Data Collection function (510) (i.e., Monitoring Data (512)) and / or data received from the Inference function (540) (i.e., Inference Output (541)).

[0121] Management Instruction (532) is information required as input to manage the Inference function (540). The relevant information may include selection / (de)activation / switching of an AI / ML model or AI / ML-based function, and may also include fallback to non-AI / ML operations (i.e., not relying on the inference process).

[0122] A Model Transfer / Delivery Request (533) can be used to request model(s) from Model Storage (550).

[0123] A Performance Feedback / Retraining Request (531) refers to information required as input to the Model Training function (520) (e.g., for the purpose of (re)training or updating the model).

[0124] The Inference function (540) is a function that provides output from the process of applying an AI / ML model or AI / ML function using data (i.e., Inference Data (513)) provided by the Data Collection (510) as input. Data preparation (e.g., data preprocessing and cleaning, formatting, and transformation) may also be performed based on the Inference Data (513) delivered by the Data Collection (510). If necessary, the Inference function (540) may also perform data preparation (e.g., data preprocessing and cleaning, forming, and transformation) based on the Inference Data (513) provided by the Data Collection function (510).

[0125] Inference Output (541) is data used by the Management function (530) to monitor the performance of an AI / ML model or AI / ML function. Inference Output (541) may also include the inference output of the AI / ML model generated by the Inference function (530), and the details of the inference output may vary depending on the use case.

[0126] The Model Storage function (550) stores a trained / updated model that can be used to perform the Inference function (540). The Model Storage function (550) illustrated in FIG. 5 can be used as a reference point (if any) when applicable to protocol termination, model transfer / delivery, and related processes. Furthermore, the Model Storage function (550) is merely an example and is not intended to limit the storage location of actual AI / ML models, and may be omitted.

[0127] Model Transfer / Delivery (551) is used to transfer AI / ML models to inference functions.

[0128] The level of cooperation can be defined as follows depending on the capability of AI / ML functions between multiple nodes, and variations due to combination of multiple levels or separation of any one level are also possible.

[0129] Cat 0a) No collaboration framework: AI / ML algorithms are purely implementation-based and do not require any changes to the wireless interface.

[0130] Cat 0b) This level corresponds to a framework with a modified wireless interface tailored to efficient implementation-based AI / ML algorithms, but without collaboration.

[0131] Category 1) involves inter-node support to improve the AI / ML algorithms of each node. For example, this applies when a specific node receives support from another node (for training, adaptation, etc.) and vice versa. At this level, model exchange between network nodes is not required.

[0132] Category 2) Joint AI / ML tasks can be performed across multiple nodes. This level requires the exchange of AI / ML model commands or network nodes.

[0133] FIG. 5 is a diagram illustrating an overall functional framework for an AI / ML model, and not all functions and / or all data / information / command signals illustrated in FIG. 5 may be performed within a specific node, but only some of them may be performed.

[0134] AI / ML models can be divided into one-side models and two-side models depending on whether training and / or inference are performed on a single node or jointly / sequentially on multiple nodes.

[0135] A one-side model can refer to an AI / ML model in which inference is performed entirely by a single node (e.g., a terminal or network). Here, AI / ML model training can also be performed entirely by a single node. AI / ML model training and inference can be performed by the same node, or they can be performed by separate nodes.

[0136] A two-side model can refer to an AI / ML model in which joint inference is performed across multiple nodes (e.g., terminals and networks). Joint inference refers to inference being performed jointly across multiple nodes. For example, the first part of the inference may be performed by a first node, and the remaining part by a second node. Two-side models can be categorized into several types depending on the training method of the AI / ML model, as follows:

[0137] - First type: AI / ML models can be trained on a single node. In this case, joint training can be performed. The trained model can then be distributed to other nodes / objects.

[0138] - Second type: Joint training of AI / ML models can be performed on multiple nodes / entities (e.g., networks and terminals). Joint training can mean that model generation (e.g., CSI generation part) and model reconstruction (CSI compression by sub-use case) are trained in the same loop for forward activation and backward gradient. In this type, joint training can include both simultaneous training (i.e., model generation training and model reconstruction training are performed simultaneously) and sequential training (i.e., model reconstruction training is performed after model generation training).

[0139] - Third type: Separate training of AI / ML models can be performed on multiple nodes (e.g., networks and terminals). Separate training may mean that training begins sequentially on one node and continues on other nodes. In this case, the first node first performs the AI / ML model and shares the training data with the second node. The second node can then use the shared training data to perform the AI / ML model. For example, training for the CSI generation part may be performed by the terminal, while CSI reconstruction may be performed by the network.

[0140] The operations described in the present invention described below can be described / interpreted based on the AI / ML model as shown in Fig. 6 below, even without separate mention (i.e., without explicit mention of being by / based on / for the AI / ML model). Fig. 6 illustrates an example of an operation procedure based on an AI / ML model applicable to the present disclosure.

[0141] Additionally, unless specifically limited in the description of the present invention, the AI / ML model may correspond to a one-side model in which inference is entirely performed by one node or a two-side model in which joint inference is performed by multiple nodes.

[0142] Step 1: In the description of the present invention described below, the signaling (e.g., information / data / channel / signal, etc.) or set of signaling between a specific node (e.g., terminal, network, etc.) and another node can be interpreted as the signaling or set of signaling of step 1 used to perform an operation based on an AI / ML model, even if there is no separate mention. For example, it can correspond to training data for training (i.e., generation and / or reconstruction) the AI / ML model of FIG. 2, or correspond to inference data used for inference of the AI / ML model, or correspond to feedback for the AI / ML model, etc. If signaling between nodes is not required prior to an operation based on an AI / ML model in the present invention, step 1 can be omitted. If a one-side model is used in the present invention, the unidirectional / bidirectional signaling (set) in the present invention can correspond to the signaling of step 1. In addition, when a two-side model is used in the present invention, unidirectional / bidirectional signaling in the present invention may correspond to one stage of signaling, and also repetitive signaling operations may correspond to one stage of signaling.

[0143] For example, in AI / ML model-based beam management (BM), if a base station predicts (i.e., infers) beam(s) with good quality based on an AI / ML model, the base station can receive quality / intensity information for multiple beams from a terminal. Furthermore, if a terminal predicts (i.e., infers) beam(s) with good quality based on an AI / ML model, the terminal can receive multiple beams from the base station.

[0144] Step 2: In the description of the present invention described below, an operation (e.g., calculation, selection, prediction, etc.) in a specific node (e.g., terminal, network, etc.) or a joint operation (e.g., calculation, selection, prediction, etc.) in multiple nodes (e.g., terminal, network, etc.) may correspond to a step 2 operation based on one or more functions in the functional framework of the AI / ML model, even if not mentioned separately. For example, it may correspond to training (i.e., generation and / or reconstruction) of the AI / ML model in FIG. 2 or inference of the AI / ML model, etc. When a one-side model is used, an operation performed by a single node in the present invention may correspond to a step 2 operation, and also when a two-side model is used, a joint operation performed by multiple nodes in the present invention may correspond to a step 2 operation.

[0145] For example, in an AI / ML model-based BM, the base station can use quality / intensity information for multiple beams received from the terminal as inference data to predict (i.e., infer) beam(s) with good quality based on the AI / ML model. Furthermore, the terminal can measure multiple beams received from the base station and use the measurement results as inference data to predict (i.e., infer) beam(s) with good quality based on the AI / ML model.

[0146] Step 3: In the description of the present invention described below, the signaling (e.g., information / data / channel / signal, etc.) or set of signaling between a specific node (e.g., terminal, network, etc.) and another node can be interpreted as a three-stage signaling or set of signaling generated due to (as a result of) an operation based on an AI / ML model, even if not otherwise mentioned. For example, it can correspond to an output due to inference of the AI / ML model in FIG. 2. If signaling between nodes is not required as a result of an operation based on an AI / ML model in the present invention, Step 3 can be omitted. If a one-side model is used in the present invention, the one-way / two-way signaling (set) in the present invention can correspond to the three-stage signaling. In addition, if a two-side model is used in the present invention, the one-way / two-way signaling in the present invention can correspond to the three-stage signaling, and furthermore, a repetitive signaling operation can correspond to the three-stage signaling.

[0147] For example, in an AI / ML model-based BM, the base station can transmit to the terminal the beam(s) predicted based on the AI / ML model as candidates so that the terminal can determine the optimal beam. Furthermore, the terminal can report to the base station the beam(s) predicted based on the AI / ML model to request the base station to transmit the candidate beams as candidates for determining the optimal beam.

[0148] C-2. THz communication

[0149] Data 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 (sub-THz band) is considered a key portion of the THz band for cellular communications. Adding the sub-THz band to the mmWave band will increase the capacity of 6G cellular communications. Among the defined THz bands, 300 GHz to 3 THz lies in the far infrared (IR) frequency band. While the 300 GHz to 3 THz band is part of the optical band, it 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. Figure 7 illustrates an example of the electromagnetic spectrum applicable to the present disclosure. The embodiment of FIG. 7 can be combined with various other embodiments. Key characteristics of THz communications include (i) widely available bandwidth to support very high data rates, and (ii) high path loss at high frequencies (which necessitates highly directional antennas). The narrow beamwidth generated by highly directional antennas reduces 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.

[0150] Transmitting system information (i.e., information related to the properties, characteristics, and / or capabilities of a BS required to use a service, such as MIB, SIB, etc.) in the THz frequency band may be inefficient because, as the beam width becomes narrower in high frequency bands, more beam sweeps must be performed to cover the entire area of ​​the cell. In particular, transmitting system information in this manner is even more inefficient when there are not many users in the cell. Accordingly, a system information transmission procedure such as that illustrated in FIG. 8 may be used.

[0151] (How to receive system information)

[0152] Figure 8 illustrates an example procedure for transmitting system information for THz communication applicable to the present disclosure. While this example was developed with THz in mind, it is also applicable to 6G communication environments where THz is not applicable. Furthermore, the procedure illustrated in Figure 8 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 Figure 8.

[0153] Referring to FIG. 8, in step 801, the base station (820) transmits system information of cell #1 through cell #2. That is, the base station (820) 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 information / state / parameter / setting generated in each of a higher layer and a physical layer. For example, the at least one information / state / parameter / setting generated in the higher layer may include at least one of SFN, control information setting for SIB1 (e.g., PDCCH configuration for SIB1, etc.), information related to cell selection / entry (e.g., cell barring, cell re-selection, etc.), and subcarrier spacing, and the at least one information / state / parameter / setting generated in the physical layer may include at least one of SFN, half frame indicator, and SSB index. However, this is merely an example, and system information may include information / status / parameters / settings related to Cell #1 / Cell #2 generated from various types of physical layers / upper layers. For this purpose, as an example, Cell #1 and Cell #2 may have a relationship as a secondary cell and a primary cell.

[0154] In step 803, UE (810) acquires synchronization for cell #1. Synchronization can be acquired by detecting a synchronization signal. Typically, synchronization is acquired before receiving system information. However, since 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, UE (810) can acquire synchronization based on system information. However, unlike FIG. 8, in another example, synchronization acquisition can be performed before step 801.

[0155] In step 805, the UE (810) transmits a signal for accessing cell #1. For example, the signal may include information for accessing cell #1 (e.g., a random access preamble, etc.). The structure of the signal and the resources for transmitting the signal (e.g., a channel) may be identified through system information. Thereafter, in step 807, the UE (810) and the base station (820) perform an access procedure for cell #1 and communicate. In this step, operations according to various embodiments described below may be performed.

[0156] The procedure described with reference to FIG. 8 may be performed when the UE (801) first connects to cell #1 of the base station (820). Alternatively, a similar procedure may be performed when the UE (801) hands over to cell #1 of the base station (820). 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 base station (520).

[0157] Communications in the THz band are expected to experience extremely severe path loss, and to overcome this, terminals and base stations must use extremely 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 the movement or movement of the terminals, frequent re-alignment of the beams is required, which can lead to link instability. Accordingly, a beam management procedure, as illustrated in FIG. 9 below, may be used.

[0158] (Beam search procedure in THz communication environment)

[0159] FIG. 9 illustrates an example of a beam management procedure applicable to the present disclosure. FIG. 9 illustrates an example of a procedure for searching and / or selecting beams for THz communication, but is not limited to a THz environment, and the present disclosure is applicable to a 6G communication environment. In addition, the procedure illustrated in FIG. 9 can be combined with various embodiments of the present disclosure described below. Here, the beam can be interpreted as 'spatial (setting) information', 'spatial domain filter', 'spatial domain transmit filter', 'spatial domain receive filter', or / and a term having an equivalent technical meaning that can distinguish the beam (e.g., Reference signal, SSB (Synchronization Signal Block) Index, TRP (transmission reception point), panel, cell, TP (transmission point), base station, control resource related information (e.g., CORESET (control resource set) related information, etc.).

[0160] Referring to FIG. 9, in step 901, the base station (920) configures resources for beam management. Here, the resources may include at least one of time-frequency resources, channels, and spatial resources (e.g., antenna ports). For example, the base station (920) may utilize a beam search signal (BSS) that is transmitted spatially separated from an existing downlink signal / channel for beam search. Here, the BSS may be transmitted based on a dedicated port for beam search. The dedicated port may be a different port from a port for transmitting an existing downlink signal / channel (e.g., a synchronization signal (e.g., SSB, etc.), a data channel (e.g., PDSCH, 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. That is, a signal transmitted based on a dedicated port defined / configured for beam search may be included in the technical concept according to the present embodiment.

[0161] In step 903, the base station (920) 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 be transmitted in a multi-beam transmission method that forms a plurality of beams simultaneously to reduce the 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).

[0162] In step 905, the UE (910) transmits a feedback signal to the base station (920). The feedback signal indicates at least one beam selected by the UE (910). The UE (910) may select at least one preferred beam based on the measurement signals received in step 903. In step 907, the UE (910) and the base station (920) perform communication. At this time, the UE (910) and the base station (920) may perform communication using the beam selected in step 905. If channel reciprocity is established, the transmission beam of the UE (910) may also be determined through steps 903 and 905, and thus, the transmission operation of the UE (910) may also be performed using the beam selected in step 905. If channel reciprocity is not established, a procedure including transmitting measurement signals of the UE (910) and transmitting feedback signals of the base station (920) may be performed to determine the transmission beam of the UE (910). In step 907, operations according to various embodiments described below may be performed.

[0163] C-3. Non-terrestrial networks (NTN)

[0164] NTN can refer to a network or network segment that uses RF (radio frequency) resources mounted on a satellite (or unmanned aerial system (UAS) platform). The use of NTN services has been considered to secure wider coverage or to provide wireless communication services in locations where it is difficult to install wireless communication base stations. NTN services can collectively refer to a wireless communication system that provides terminals by installing base stations on satellites (e.g., geostationary-orbit, low-Earth orbit, medium-geometry satellites, etc.), airplanes, unmanned airships, drones, etc. rather than on the ground. The satellite described in the present disclosure can move at high speed from a specific location on the Earth, and the satellite beam directed toward the Earth can correspond to an area on the Earth where the satellite can provide services to users.

[0165] As an example of the present disclosure, NTN scenarios can be divided into Earth-fixed cell scenarios and Earth-moving cell scenarios depending on the type of cell supported by the satellite. The Earth-fixed cell scenario refers to a scenario in which a cell is maintained permanently or for a specific service period within a specific location on the Earth's surface based on the satellite's beam steering function. The Earth-moving cell scenario refers to a scenario in which a cell within the Earth's surface continuously moves as the satellite's beam steering function is not utilized and a fixed beam is used for service.

[0166] As another example of the present disclosure, the NTN scenario can be divided into a typical NTN scenario based on a transparent payload and a typical NTN scenario based on a regenerative payload, depending on the characteristics of the payload. Fig. 10a illustrates an example of a typical NTN scenario based on a transparent payload applicable to the present disclosure. Fig. 10b illustrates an example of a typical NTN scenario based on a regenerative payload applicable to the present disclosure. The embodiments of Fig. 10a or Fig. 10b can be combined with various embodiments of the present disclosure. Referring to Fig. 10a, a satellite (or UAS platform) can create a service link with a UE. The satellite (or UAS platform) can be connected to an (NTN) gateway via a feeder link. The satellite can be connected to a data network via the gateway. A beam footprint can refer to an area where a signal transmitted by a satellite can be received. Referring to Figure 10b, a satellite (or UAS platform) can establish a service link with a UE. A satellite (or UAS platform) connected to a UE 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 replay payload, a satellite can be connected to a data network through another satellite and the gateway. If an ISL does not exist between a satellite and another satellite, a feeder link between the satellite and the gateway may be required. Figures 10a and (b) are merely examples of NTN scenarios, and NTN can be implemented based on various scenarios.For example, a satellite (or UAS platform) may implement a transparent or regenerative (with onboard processing) payload. For example, a satellite (or UAS platform) may generate multiple beams over 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) may vary depending on the onboard antenna diagram and minimum elevation angle. For example, a transparent payload may include radio frequency filtering, frequency conversion, and amplification. Therefore, the waveform signal repeated by the payload may not be altered. 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 equipping the satellite (or UAS platform) with all or part of the base station functionality.

[0167] Below, we describe procedures (e.g., initial cell selection, mobility management in idle mode, and mobility management in connected mode) for maintaining network service continuity and satellite coverage in a wireless communication system utilizing NTN elements.

[0168] - Initial cell selection procedure

[0169] Upon power-on, the terminal can search for the first satellite-based NTN cell (or the satellite broadcasting the cell). At this time, if the terminal has satellite orbit information (i.e., ephemeris data) and / or round-to-trip (RTT) information that can be used when performing a cell entry procedure (e.g., a random access procedure), the terminal can use such information to shorten the cell search procedure and the time required for cell search. To this end, the terminal may require (initial) system information including satellite ephemeris information to identify the exact location of the cell, and the (initial) system information may be set / determined / generated based on orbital plane information already possessed by the terminal. For example, satellite-level orbit parameters for all satellites capable of providing services to the terminal through the terminal uSIM, including satellite IDs or indices, may be provided in advance. Afterwards, the satellite ID of the service satellite is broadcast as part of the system information, allowing the terminal to derive ephemeris data and / or location coordinates of the service satellite stored in the uSIM. Additionally, to assist mobility handling, the terminal can obtain information about neighboring satellites through system information and / or dedicated RRC signaling.

[0170] Here, the satellite ephemeris information transmitted to the terminal via system information and / or RRC signaling can be implemented / supported in i) a position and velocity state vector orbit format and ii) an orbital parameter ephemeris format. For example, the position and velocity state vector orbit format can be configured with 17 bytes or less (e.g., 132 bits). The field size for position (x, y, z)(m) can be 78 bits, and the field size for velocity (vx, vy, vz)(m / s) can be 54 bits.

[0171] The orbital parameter ephemeris format can be composed of 21 bytes or less (e.g., 164 bits). Fig. 11a illustrates an example of the components of the orbital parameter ephemeris format. The components of the orbital parameter ephemeris format illustrated in Fig. 11a are as follows.

[0172] - Semi-major axis (half the major axis of an elliptical satellite orbit) "α" [m] (e.g. 33 bits)

[0173] - Eccentricity "e" (in an elliptical satellite orbit, 0 <e<1)(예: 20 비트)

[0174] - Argument of periapsis (the angle from the orbital periapsis, the point where an object is closest to the central body when orbiting, to the ascending node, which determines the direction of the ellipse in the orbital plane) "ω" (e.g. 28 bits) [rad]

[0175] - Longitude of ascending node (the angle measured counterclockwise from a reference point (e.g., the vernal equinox in the solar system) to the ascending node (the point where the orbit passes above the reference plane)) "Ω" (e.g., 28 bits) [rad]

[0176] - (orbital) inclination (the degree of tilt of the ellipse with respect to the reference plane, measured as the angle between the orbital plane and the reference plane at the ascending node) "i" (e.g. 27 bits) [rad]

[0177] - Mean anomaly (mathematically convenient angle that changes continuously over time, but does not correspond to a geometric angle) "M0" = M(t0) (e.g. 28 bits) [rad] at epoch t0 [JD]

[0178] - Mobility management in idle mode

[0179] During idle mode, the location of a terminal can be identified at the tracking area level / unit. Here, a tracking area is defined as a set of cells, and each cell can belong to a tracking area identified by a tracking area code (TAC). The TAC can be transmitted via system information on a broadcast channel. Multiple cells can belong to the same tracking area, and the same TAC corresponding to the same tracking area can be broadcast. The location of a terminal can be announced to the network when the terminal is first powered on (i.e., when performing a registration procedure). The registration request message transmitted by the terminal for the registration procedure can include the TAC of the cell in which the terminal is currently camping. When the terminal changes cells as it moves, the tracking area of ​​the corresponding cell can be determined by decoding the system information of the changed cell. The terminal can move within the same tracking area without performing an update. When a terminal enters a new cell using a different TAC, the terminal can register in the new cell and transmit a new TAC to update the network about its location. Consequently, a larger tracking area can reduce signaling from the terminal to the network, minimizing terminal power consumption. When the network needs to reach a terminal in idle mode (e.g., during an incoming call), the network can page the terminal in all cells within the last tracking area in which the terminal registered. If the tracking area is very large and contains many cells, the network may page the terminal in all cells within the TAC, resulting in an increased number of pages. If the same model is used for a satellite system, with each satellite broadcasting a TAC, the tracking area can sweep the ground as the satellite orbits the Earth.In this case, even stationary terminals must frequently perform registration updates, which can impact terminal battery life and increase uplink signal throughput. To address this, the system can be designed so that the tracking area does not change its geographic location on Earth. Instead, the tracking area can change as the satellite moves, entering a new geographic area and updating the TAC broadcast by the satellite to reflect the new geographic area. Simultaneously, the terminal can perform a tracking area update procedure if it detects a new TAC on the broadcast channel. Accordingly, if the terminal's physical location on Earth does not change, the tracking area can remain fixed.

[0180] - Mobility management in connected mode

[0181] While the UE is in connected mode, mobility management procedures can be handled by handover. For terrestrial / NTN networks, handovers can be triggered by the network (i.e., measurement handover triggering) based on measurements reported by the UE regarding the current cell and neighboring cell signal quality. Within the handover procedure, service interruption time is defined as the time from when the UE ceases transmitting and receiving with the source base station to when it resumes transmitting and receiving with the target base station. The interruption time may vary for uplink and downlink. For downlink, the interruption time can be defined as the time from when the network transmits a synchronized RRC reconfiguration message to when the target base station receives an RRC reconfiguration complete message. After transmitting the RRC reconfiguration message, the base station cannot send any more data and can resume communication after receiving the RRC reconfiguration complete message. For uplink, the UE can potentially continue transmitting data to the source base station until a synchronized RRC reconfiguration message is received. And, the downtime can be defined as the time from the time the terminal receives a synchronized RRC reset message to the time the target base station receives an RRC reset complete message.

[0182] The propagation delay of satellite-based NTN is much larger than that of terrestrial systems, which may incur additional latency for mobility signals such as measurement reports, handover (HO) command reception, and HO requests / ACKs (if the target cell originates from a different satellite). The geostationary Earth orbit (GEO) scenario is characterized by much larger propagation delays than the low Earth orbiting (LEO) scenario, but the latter must take satellite movement into account. To avoid extended service interruptions, the latency associated with mobility signals must be addressed in both cases. In addition to the measurement-triggered handover described above, other handover triggering methods may be utilized, such as handover triggering based on the position of the UE and the satellite (or the distance between the UE and the satellite), handover triggering based on the timing advance (TA) of the target cell, handover triggering based on deterministic satellite movement / local time, and handover triggering based on the elevation angle of the source / target cells. Additionally or alternatively, the terminal may be provided with handover settings and triggering conditions (e.g., terminal / satellite location, signal strength transmitted by the terminal / satellite, etc.) in advance. For example, the terminal may receive handover settings and triggering conditions through information about a new cell that will be the handover target. Accordingly, the terminal can monitor handover conditions and, if the conditions are met, perform a handover to the target cell.

[0183] Meanwhile, as described above, wireless communication systems utilizing NTN elements have significantly larger RTT values ​​compared to terrestrial communication systems. Therefore, various types of offsets and TA values ​​can be set / defined / indicated / signaled for efficient time / frequency synchronization. Below, offsets (e.g., K_offset and k_mac), TA values, validity duration, and epoch time for time / frequency synchronization in NTN-based wireless communication systems are described.

[0184] - K_offset and k_mac

[0185] Figure 11b illustrates examples of offsets in a satellite-related link. K_offset illustrated in Figure 11b is an offset value indicating the RTT of an uplink time synchronization reference point (RP). Here, K_offset may correspond to the sum of the service link RTT and the common TA (if indicated). k_mac illustrated in Figure 11b is an offset value indicating the RTT between the RP and the base station. For example, K_offset may be applied to i) DCI and PUSCH transmission timing scheduled by the DCI, ii) random access response (RAR) and PUSCH transmission timing based on the RAR, iii) PUSCH transmission timing based on a configured grant, iv) PUCCH transmission timing according to MsgB, v) aperiodic SRS / CSI resource transmission timing, etc. For example, k_mac may be applied to terminal actions and assumptions regarding a downlink configuration indicated by a MAC-CE command in a PDSCH. In a beam failure recovery procedure, for PRACH transmission in uplink slot n, the terminal may monitor the corresponding PDCCH starting from downlink slot "n+k_mac+4" within the corresponding RAR window.

[0186] The cell-specific K_offset can be signaled via NTN-related system information (e.g., NTN-specific SIB). A range of cell-specific K_offset values ​​(0 to 1023 ms) can be used to cover all scenarios. A differential UE-specific K_offset can be signaled via MAC CE, and the differential UE-specific value range is 0 to 63 ms. The total UE-specific K_offset value is equal to the cell-specific K_offset value minus the differential UE-specific K_offset value. k_mac can be provided by the network when the downlink and uplink frame timings are not aligned at the base station. k_mac updates are not supported, and the value range can be 1 to 512 ms. If the UE does not receive a k_mac value from the network, the UE can assume k_mac to be 0. The reference SCS value for the units of K_offset in FR1 can be 15 kHz.

[0187] - UE-specific TA and common TA

[0188] In an NTN-based communication system, a terminal can calculate TA based on the terminal's global navigation satellite system (GNSS) capability (e.g., terminal position) and upper layer parameters related to satellite orbit (ephemeris) transmitted from a base station, and this is called terminal-specific TA ( ) is named. If the upper layer parameters related to the satellite orbit are not received from the base station, the terminal-specific TA can be set to 0. Then, the TA calculated based on the common TA parameters (e.g., TACommon, TACommonDrift, and / or TACommonDriftVariation), which are upper layer parameters transmitted from the base station, is called the common TA ( ) is named. If the common TA parameter is not transmitted from the base station, the common TA can be set to 0. Accordingly, the total TA value (T_TA) in the NTN-based communication system is It can be calculated as follows. N_TA,offset means the TA offset value provided to the terminal for each serving cell, and N_TA means the value derived based on the timing advance command.

[0189] Figure 11c illustrates examples of timing advanced (TA) values ​​for a satellite-related link. As illustrated in Figure 11c, a terminal-specific TA is calculated to compensate for transmission delay for the service link, and a common TA is calculated to compensate for transmission delay between the RP and the satellite.

[0190] - Valid interval and epoch time

[0191] The validity period refers to the (maximum) time period during which the terminal can apply the previously acquired assistance information (from the epoch time) without acquiring new assistance information (e.g., serving and / or neighboring satellite orbits (ephemeris) and common TA parameters, etc.). The configuration information related to the validity period can be broadcast from the base station via the NTN-related system information (e.g., SIB19) for each cell. For example, the validity period length range can be configured as, but is not limited to, {5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s, 60s, 120s, 180s, 240s, 900s}. The validity timer with the set validity period value can be (re)started at the epoch time of the assistance information. If no new or additional support information is available within that validity period, the terminal may assume that uplink synchronization is lost.

[0192] The serving satellite ephemeris and common TA parameters are signaled in the same SIB message and may have the same epoch time. If the epoch time is explicitly provided via SIB, the epoch time of the assistance information (i.e., the satellite ephemeris and common TA parameters) is the start time of the DL subframe indicated by the SFN and the subframe number signaled together with the assistance information. If the epoch time is not explicitly indicated via SIB, the epoch time of the assistance information may be implicitly known as the end of the SI window in which NTN-specific system information (e.g., SIB19) is transmitted. If the epoch time is provided via dedicated signaling, the epoch time of the assistance information is the start time of the DL subframe and may be indicated by the SFN and the subframe number.

[0193] For a serving cell, if the epoch time is explicitly indicated by the SFN and subframe number, the UE may consider the frame as the current SFN or the next SFN after the frame in which the message indicating the epoch time was received. For a neighboring cell, if the epoch time is explicitly indicated by the SFN and subframe number, the UE may consider the frame as the frame closest to the frame in which the message indicating the epoch time was received.

[0194] C-4. Integrated Sensing and Communication (ISAC)

[0195] Wireless sensing is a technology that uses radio frequencies to determine the instantaneous linear velocity, angle, distance (range), etc. of an object, thereby obtaining 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, i.e., 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.

[0196] FIGS. 12A and 12B illustrate examples of sensing operations applicable to the present disclosure. The embodiments of FIGS. 12A and 12B can be combined with various embodiments of the present disclosure. Specifically, FIG. 12A illustrates an example of sensing using a sensing receiver and a sensing transmitter located at the same location (e.g., monostatic sensing), and FIG. 12B illustrates an example of sensing using separate sensing receivers and sensing transmitters (e.g., bistatic sensing).

[0197] For example, in a wireless communication system based on a 6G network of the present disclosure, referring to FIG. 12a, the sensing transmitter and the sensing receiver may be configured to be included in a single base station (i.e., the same base station) or a single terminal (i.e., the same terminal). Alternatively, referring to FIG. 12b, the sensing transmitter and the sensing receiver may be configured to be included in different base stations, different terminals, or each terminal and base station.

[0198] In this regard, the following six types of sensing modes can be defined based on whether the sensing transmitter and sensing receiver are included in the base station or the terminal, respectively.

[0199] - Mode 1: A mode in which the sensing transmitter and sensing receiver are contained in a single base station (e.g., base station-based sensing mode in monostatic mode).

[0200] - Second mode: A mode in which the sensing transmitter is included in a first base station and the sensing receiver is included in a second base station different from the first base station (e.g., base station-based sensing mode in bistatic mode).

[0201] - Mode 3: A mode in which the sensing transmitter is included in the base station and the sensing receiver is included in the terminal (e.g., base station-terminal sensing mode).

[0202] - Mode 4: A mode in which the sensing transmitter is included in the terminal and the sensing receiver is included in the base station (e.g., terminal-base station sensing mode).

[0203] - Mode 5: A mode in which the sensing transmitter and sensing receiver are contained in a single terminal (e.g., terminal-based sensing mode in monostatic mode).

[0204] - 6th mode: A mode in which the sensing transmitter is included in a first terminal and the sensing receiver is included in a second terminal different from the first terminal (e.g., terminal-based sensing mode in bistatic mode).

[0205] In a wireless communication system based on the 6G network of the present disclosure, one or more of the six types of sensing modes described above may be utilized independently / in combination.

[0206] With respect to the sensing operation in FIGS. 12A and 12B , the sensing transmitter may transmit a sensing signal for sensing one or more objects (and / or an environment around the objects). For example, the sensing signal may correspond to a radio (frequency) signal defined to be transmittable by a base station / terminal in a wireless communication system based on a 6G network of the present disclosure. The sensing receiver may receive a signal scattered / reflected by one or more objects (and / or an environment around the objects) from the sensing signal transmitted from the sensing transmitter. In the sensing receiver, sensing data may be derived from the scattered / reflected signals, and sensing results may be generated / obtained through processing of the sensing data. Here, the sensing results may include characteristic information (e.g., location, distance, speed, angle, etc.) about one or more objects (and / or the environment around the objects). The sensing results generated / obtained in this way may be utilized for wireless sensing services (e.g., detection, tracking, etc. of objects and / or environments) provided in a wireless communication system based on the 6G network of the present disclosure, or may be provided / disclosed to a trusted third party.

[0207] Additionally, the sensing operations in FIGS. 12A and 12B are described as a representative example of operations in a wireless communication system based on a 6G network, but can be extended and applied to cases where terminals / base stations / signals based on networks of previous generations (e.g., 4G, 5G, etc.) are utilized.

[0208] Additionally, with respect to the wireless sensing described in the present disclosure, in a wireless communication system based on a 6G network of the present disclosure, time / frequency resources for sensing operations and time / frequency resources for general communications (e.g., UL / DL / sidelink-based communications, etc.) may be scheduled / configured separately.

[0209] FIG. 13 illustrates an example of time / frequency resources for sensing operations applicable to the present disclosure. The embodiment of FIG. 13 may be combined with various embodiments of the present disclosure.

[0210] Referring to FIG. 13, time / frequency resources (hereinafter, sensing resources) for the aforementioned sensing operation (e.g., sensing operation based on FIG. 12a and FIG. 12b) can be set / allocated separately from time / frequency resources (hereinafter, communication resources) for general communication.

[0211] For example, as illustrated in FIG. 13, sensing resources can be set / allocated in units of symbols in the time domain and / or resource blocks in the frequency domain. Resources other than those for which the sensing resources are set / allocated can be utilized as resources for general communication. That is, sensing resources and communication resources can be set / allocated based on the time-division multiplexing (TDM) method and / or the frequency-division multiplexing (FDM) method in terms of the operation of the base station / terminal. Additionally or alternatively, unlike what is illustrated in FIG. 13, sensing resources can also be set / allocated based on other units in the time domain (e.g., slots, frames, absolute time (ms, us), etc.) and / or other units in the frequency domain (e.g., subcarriers, carriers, absolute frequencies (MHz, GHz), etc.).

[0212] Additionally or alternatively, in connection with the setting / allocation / scheduling of resources for general communication as described in the present disclosure, the relationship between the resources and the aforementioned sensing resources may need to be considered. For example, when setting / allocating resources for general communication according to the embodiment(s) of the present disclosure, the resources may be set / allocated to rate-match or puncture the resource region corresponding to the sensing resource. For example, when scheduling resources for general communication according to the embodiment(s) of the present disclosure, the resources may be scheduled so as not to overlap with the resource region corresponding to the sensing resource. If the resources for general communication according to the embodiment(s) of the present disclosure and the resource region corresponding to the sensing resource are set / allocated / scheduled to overlap, one or both operations may be dropped, skipped, or postponed based on priorities, predefined rules, etc. That is, in the embodiment(s) of the present disclosure, it may be desirable that resources related to general communication (e.g., resources for signals / channels related to UL / DL / Sidelink-based data / control, etc.) are set / allocated / scheduled so as not to overlap with the aforementioned sensing resources.

[0213] Additionally, various channel modeling methods may be applied to the wireless sensing described in the present disclosure. Channel modeling related to sensing may refer to configuring a path for transmitting and receiving sensing signals and / or scattered / reflected signals, taking into account the object being sensed and / or the environment in which the object resides. Channel modeling may be related to the performance / requirements of sensing in a wireless communication system, and thus may be an important factor in validating the sensing function.

[0214] Channels related to sensing can be divided into channels between objects (e.g., targets of interest) and sensing transmitters / receivers, and channels between the environment to which the object belongs and sensing transmitters / receivers. In this regard, channel modeling related to sensing can be divided based on sensing mode (e.g., the six types of modes described above), whether there is an object / environment, and / or sensing scenarios. For example, channel modeling for a target in a base station / terminal-based monostatic sensing mode, channel modeling for a target in a base station / terminal-based bistatic sensing mode, channel modeling for the environment in a base station / terminal-based monostatic sensing mode, and channel modeling for the environment in a base station / terminal-based bistatic sensing mode can be configured and optimized differently. For example, when various sensing scenarios are classified, channel modeling for detection, location, and tracking scenarios, channel modeling for motion recognition, and channel modeling for imaging / environment reconstruction scenarios can be divided, etc. Additionally, channel modeling related to sensing may be based on statistical channel modeling techniques and / or deterministic channel modeling techniques. For example, modeling for sensing in a wireless communication system based on a 6G network of the present disclosure may be based on stochastic geometric channel modeling techniques and / or a hybrid with ray tracing channel modeling technique. Here, the stochastic geometric channel model may be based on various statistical characteristics of the channel state. Furthermore, the hybrid channel model may be based on both ray tracing techniques and stochastic techniques.In a hybrid approach, channels for objects requiring high accuracy and consistency (e.g., targets of interest) can be modeled using ray tracing techniques, while channels for the environment can be modeled using probabilistic techniques.

[0215] FIG. 14 illustrates an example of a procedure related to a sensing operation applicable to the present disclosure. The embodiment of FIG. 14 may be combined with various embodiments of the present disclosure.

[0216] For example, in a wireless communication system based on a 6G network of the present disclosure, in the case of a sensing operation in which a terminal participates, the base station may need to verify the capability of the terminal for the sensing operation. In this regard, the terminal may be configured to report capability information regarding whether it supports the sensing operation to the base station. Additionally or alternatively, if the terminal is predefined in the standard to support the sensing operation, the procedure may be omitted. In addition, in the case of a sensing operation in which only the base station participates, the base station may be configured to report capability information regarding whether it supports the sensing operation to an entity that configures / controls its sensing operation (e.g., a network entity at a higher level / layer of the base station).

[0217] For example, the base station can perform signaling with the terminal to exchange configuration information related to the sensing operation. For example, the base station can configure / instruct the terminal information about the mode of the sensing operation (e.g., based on the six types of modes described above), the subject of the sensing operation (e.g., sensing transmitter, sensing receiver), the resource of the sensing operation (e.g., sensing resource as in FIG. 13), the target of utilizing the sensing result (e.g., type of wireless sensing service based on 6G network, trusted third party), channel modeling for sensing (e.g., channel between the base station / terminal and object / environment), etc. For example, the base station can also configure / instruct such information from a network entity at an upper level / layer of the base station.

[0218] For example, the base station and / or the terminal may perform a sensing operation based on the set / instructed information. For example, the base station and / or the terminal may, as a sensing transmitter and / or a sensing receiver, perform procedures such as transmitting a sensing signal, receiving a scattered / reflected signal, deriving sensing data, obtaining a sensing result through processing the sensing data, and providing the sensing result, as in FIGS. 12A and 12B described above. As an example, in the operation of the base station / terminal described in the present disclosure, a sensing result provided through a sensing operation may be utilized.

[0219] D. NES (network energy saving)

[0220] Energy conservation at base stations is a key consideration in wireless communication systems, including 3GPP, as it can contribute to building eco-friendly networks by reducing carbon emissions and reducing operational expenditures (OPEX) for telecommunications companies. In particular, the introduction of 5G communications will require higher transmission rates, necessitating base stations to be equipped with more antennas and provide services across wider bandwidths and frequency bands. Consequently, recent studies have shown that base station energy costs have reached as high as 20% of total OPEX. Accordingly, 5G systems are adopting various technologies to reduce energy consumption, known as network energy savings (NES), and the standardization of related technologies is expected to continue. Specifically, the following techniques were discussed in the recent Rel-18.

[0221] -----------------------------------------------------------------------

[0222] 1. If deemed feasible by RAN4 studies, specify SSB-less SCell operation for interband CA for FR1 and co-located cells, where the UE measures SSB transmitted on the PCell or another SCell for SCell time / frequency synchronization (including downlink AGC) and L1 / L3 measurements, including potential enhancements to the SCell activation procedure if required. [RAN4, RAN2]]

[0223] 2. Embody improvements to the cell DTX / DRX mechanism, including inter-node information exchange for cell DTX / DRX and alignment of cell DTX / DRX and UE DRX in RRC_CONNECTED mode. [RAN2, RAN1, RAN3]

[0224] ·Note: No changes to SSB transmission due to cell DTX / DRX.

[0225] ·Note: The above improvements should avoid any impact on IDLE / INACTIVE UEs.

[0226] 3. Implement the following technologies in the space and power domains:

[0227] · To enable efficient adaptation of spatial elements (e.g., antenna ports, active transceiver chains), specify necessary improvements to CSI and beam management-related procedures, including measurement and reporting, and signaling. [RAN1, RAN2]

[0228] · To enable efficient adaptation of power offset values ​​between PDSCH and CSI-RS, necessary improvements to CSI-related procedures, including measurement, reporting, and signaling, are specified. [RAN1, RAN2]

[0229] · Note: The above goals are only applicable to UE specific channels / signals.

[0230] · Note: Given the total number and requirements of CSI reports, conventional UE CSI / CSI-RS capabilities apply.

[0231] 4. If necessary, specify a mechanism to prevent camping of legacy UEs in cells adopting Rel-18 NES technology. [RAN2]

[0232] 5. Implement improvements to the CHO procedure when the source / target cell is in NES mode. [RAN2]

[0233] 6. Improvements to limit paging in limited areas and specify inter-node beam activation [RAN3].

[0234] 7. If necessary, specify the RRM / RF core requirements for the above features. [RAN4]

[0235] -----------------------------------------------------------------------

[0236] According to the application of NES technology, the base station can perform operations such as controlling on / off for a certain duration in the time domain, controlling transmission / reception resources for UE-common or UE-specific signals / channels, changing the amount of frequency domain resources, controlling transmission power, or turning on / off antenna ports, transmission-reception points (TRPs), etc. in the spatial domain. Fig. 15 illustrates an example of an operation procedure of a base station supporting the NES technology applicable to the present disclosure. Referring to Fig. 15, the base station identifies NES solution(s) to be applied. The NES solution(s) may be related to control of signal transmission / reception (e.g., on / off), beam operation, handover procedure, channel measurement and reporting, etc. Which NES solution(s) to apply can be adaptively selected or predefined depending on the current situation (e.g., cell load level, characteristics of connected terminals, etc.). The base station, having identified the NES solution(s), performs signaling for the NES. The specific signaling procedure may vary depending on the identified NES solution(s). For example, the base station may transmit common information about the NES solution(s), transmit configuration information necessary for NES operation to at least one terminal, or transmit control information regarding the progress of the NES operation to at least one terminal. In addition, the base station may receive capability information related to the NES from at least one terminal. Thereafter, the base station performs operations for the NES. At this time, the base station may perform operations for the NES based on the previously performed signaling. That is, based on the system information, configuration information, and control information transmitted through the signaling, the base station may turn on / off the transmission / reception of a specific signal, turn on / off elements in the spatial domain, or adjust resources for the transmission / reception of a measurement signal.

[0237] Through a procedure similar to that in Fig. 12, NES technology can be implemented. Examples of NES solutions that can be implemented through a procedure similar to that in Fig. 12 are as follows.

[0238] · Intra-system energy saving solution: A RAN node can request a neighboring RAN node to switch at least one SSB beam into its inactive cell, or can perform paging using a limited set of beams to an inactive terminal (e.g., a stationary terminal).

[0239] · Inter-system energy saving solution: NG-RAN nodes that own capacity booster cells can autonomously transition those cells to an inactive state.

[0240] · SSB-less SCell solution: If SSB or SMTC (SSB-based RRM measurement timing configuration) configuration is not provided for the SCell, the UE can obtain the timing reference and AGC source from another serving cell. In FR1 or FR2, the base station can configure intra-band CA or inter-band CA including the SCell without SSB transmission, in which case the SSB / SIB transmission can be triggered by the WUS (wake-up signal) of the UE. Accordingly, since the period of common channels / signals such as SSB increases, the base station can stay in the sleep state for a longer time.

[0241] · Cell DTX / DRX (discontinuous transmission / discontinuous reception) solution: In order to reduce the downlink transmission / uplink reception activity time of a base station, a periodic cell DTX / DRX pattern (e.g., active and inactive periods) can be commonly set for terminals within a cell having the corresponding feature. Here, the cell DTX pattern and the cell DRX pattern can be separately set and activated, and up to two cell DTX / DRX patterns can be set per MAC entity. When cell DTX is set and activated, at least one of monitoring for SPS opportunities or monitoring PDCCH can be stopped during the cell DTX inactivity period. When cell DRX is set and activated, at least one of transmission on CG resources or SR transmission can be stopped during the cell DRX inactivity period. Cell DTX / DRX can be activated / deactivated via RRC signaling or L1 group common signaling.

[0242] · Parameters such as active duration and cycle may be configured for cell DTX / DRX. The active duration is the period during which the UE receives a PDCCH or SPS opportunity and waits to transmit SR or CG, and the cycle specifies the periodic repetition of the active duration and the inactive duration. When both cell DTX and cell DRX are configured, parameters such as active duration and cycle are common. If the base station recognizes an emergency call or a public safety-related service (e.g., MPS or MCS), the network may release or deactivate the cell DTX / DRX configuration so as not to affect the service. In addition, at least some overlap is required between the active duration of the connected mode DRX of the UE and the active duration of the cell DTX / DRX. For example, the connected mode DRX cycle of the UE may be a multiple of the cell DTX / DRX cycle, or vice versa.

[0243] · Conditional handover (CHO) solution: A CHO procedure is used when the UE determines whether to execute a handover while NES technology is applied (e.g., when the cell activates or deactivates cell DTX / DRX). In this case, the UE can use an NES-specific CHO event to initiate CHO to a candidate cell, and the reception of a DCI activating the CHO condition(s) set by the NES event indication can be applied as an additional triggering condition for this.

[0244] · Spatial and Power Domain Adaptation Solution: To support gNBs for transceiver muting and / or transmit power adaptation, a UE may be configured to report multiple CSI entries in a CSI report based on multiple sub-configurations. Each sub-configuration corresponds to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a power offset between a data channel (e.g., PDSCH) and CSI-RS. Depending on the application of the spatial and power domain adaptation solution, the CSI configuration, measurement, and / or reporting behavior may be affected.

[0245] Cell DTX / DRX

[0246] To operate a base station in sleep mode for a relatively long period of time without frequent wake-ups, a base station DTX / DRX has been proposed for NES purposes. The base station can reduce energy consumption by utilizing DTX transmission in low system load situations by setting a cell DTX and setting the on-duration of the C-DRX of terminals within the active period of the cell DTX. Figure 16 illustrates an example of a procedure for cell DTX / DRX operation applicable to the present disclosure.

[0247] Referring to FIG. 16, the base station transmits system information to the terminal, and the terminal checks information related to cell DTX / DRX. For example, the system information may include MIB, SIB1, etc. In relation to NES technology, the MIB may include information related to cell barring (e.g., cellBarred), and the SIB1 may include information related to the cell barring status (e.g., cellBarredNES). Specifically, if cellBarred included in the MIB is set to a value indicating that it is not barred (e.g., notBarred), the terminal may determine that the cell is not barred, regardless of whether it supports NES cell DTX / DRX. Conversely, if cellBarred included in the received MIB is set to a value indicating that the cell is barred (e.g., barred), a terminal that does not support NES cell DTX / DRX may determine that the cell is barred. However, if the terminal has the capability to support NES cell DTX / DRX, the terminal checks SIB1 to determine the cell barring status. If cellBarred of MIB is set to barred and cellBarredNES is absent in SIB1, the terminal supporting NES cell DTX / DRX can treat the cell as barred and perform cell reselection to another cell. On the other hand, if cellBarred of MIB is set to barred and cellBarredNES is included in SIB1, the terminal supporting NES cell DTX / DRX can determine that the cell is not barred.

[0248] In the case of FIG. 16, it is assumed that the terminal has the capability to support NES cell DTX / DRX, and the cellBarred of the MIB is set to notBarred, or the cellBarred of the MIB is barred and cellBarredNES is included in SIB1. Accordingly, the terminal can perform a random access procedure to connect to the base station, and then perform communication. At this time, the base station performs a cell DTX / DRX operation, and transmits configuration information related to the cell DTX / DRX operation to the terminal. The configuration information related to the cell DTX / DRX operation (e.g., CellDTXDRX-Config) includes at least one parameter related to the cell DTX / DRX, and may include, for example, at least one of an on-duration timer, a cycle start offset, a slot offset, a configuration type (e.g., DTX, DRX, or DTX-DRX), and an activation state of the DTX / DRX (e.g., active, inactive). Additionally, the configuration information may further include information for receiving and interpreting cell DRX / DRX-related control information (e.g., DCI-related information).

[0249] Thereafter, the base station transmits control information related to cell DTX / DRX to the terminal. The control information related to cell DTX / DRX may include DCI having a designated format (e.g., format 2_9). If an operation for a serving cell according to at least one of the cell DTX operation and the cell DRX operation is configured by configuration information (e.g., cellDTXDRX-Config), the terminal may check a set of search spaces (e.g., a set of Type3-PDCCH CSSs) for monitoring a PDCCH conveying control information of a designated format during an active time through a higher layer parameter (e.g., SearchSpace), and may obtain a location of information about the serving cell within the control information through a higher layer parameter (e.g., positionInDCI-cellDTRX). Then, the terminal may obtain control information based on the identified set of search spaces and location.

[0250] Control information related to cell DTX / DRX may be used to indicate activation or deactivation of cell DTX and / or cell DRX, and / or to provide an NES-mode indicator, and may include, for example, at least one block including a cell DTX / DRX indicator and an NES-mode indicator. In this case, when the serving cell is configured as a SUL (supplementary uplink) carrier, the indication of activation or deactivation of cell DRX by the cell DTX / DRX indicator may be applied to both the UL carrier and the SUL carrier.

[0251] Thereafter, the terminal and the base station can perform communication based on the cell DTX / DRX. Specifically, the base station can turn on / off the transmission and reception of signals according to the settings related to the cell DTX / DRX, and accordingly, the terminal can selectively monitor the signal from the base station. During the DTX-OFF, the base station enters a sleep mode to reduce energy consumption. At this time, the base station DTX cycle can be aligned with the cycle of the terminal DRX. The base station DTX-ON can completely cover the DRX-ON of the terminal. Furthermore, the base station can align the transmission of Xn / NG and the transmission of Uu for the purpose of NES. The DTX / DRX mechanism triggers the switching of reference signal resource set groups, and the base station can perform a dormancy-like behavior of sparsely transmitting or not transmitting SSB, SIB, and CSI-RS to reduce energy consumption. The terminal may sparsely receive or not receive a downlink signal / channel depending on the settings of the base station. Once the base station DTX / DRX operation is triggered, during the DTX / DRX OFF period, the terminal can discontinuously receive the corresponding CSI-RS, SSB, or PDCCH.

[0252] CSI Measurement and Reporting

[0253] Figure 17 illustrates an example of a procedure for CSI measurement and reporting applicable to the present disclosure.

[0254] Referring to FIG. 17, a base station transmits configuration information for CSI to a terminal. The configuration information for CSI may include information related to a CSI-RS resource or a set of resources (e.g., time-frequency resource information, sequence information, power information, etc.), information related to CSI reporting (e.g., report quantity information, report type information, report resource information, codebook information, etc.), information related to CSI measurement, etc. Here, in order to assist the base station with transmitter / receiver muting and / or transmission power adaptation of the base station, the terminal may be configured to report multiple CSI entries in the CSI report based on a plurality of sub-configurations, wherein each sub-configuration corresponds to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a power offset. Additionally, with respect to CSI reporting, a higher layer parameter (e.g., CSI-ReportConfig) included in the configuration information may include a list of sub-configurations, each sub-configuration being identified by an identifier (e.g., csi-ReportSubConfigID), corresponding to a list of at least one CSI-RS resource, corresponding to a CSI-RS antenna port subset, and / or, in addition to power control offset related parameters (e.g., powerControlOffset) of the CSI-RS resource(s), corresponding to a power offset for a PDSCH related to the CSI-RS.

[0255] At this time, the configuration related to CSI may include multiple sub-configurations. Accordingly, 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 the terminal is configured with configuration information related to CSI reporting including sub-configurations (e.g., CSI-ReportConfig), the terminal does not expect that the upper layer parameter related to the 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'. 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-settings set for the terminal through MAC-CE or DCI. That is, the trigger state of aperiodic CSI reporting can be set as needed, and whether semi-static CSI reporting is activated can be controlled by an activation command.

[0256] For example, with respect to the configuration of a reporting item, 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.

[0257] For example, with regard to configuration for a report item, the terminal can determine the codebook type based on the presence or absence of sub-configurations. Specifically, if sub-configurations are configured for a CSI report, the terminal can exclude the configuration of at least one codebook type. However, depending on the terminal's capabilities, it is possible to configure at least one codebook type.

[0258] For example, in relation to the settings for the reporting items, a power offset value and an NZP CSI-RS resource set may be set for each sub-setting. In this case, the interpretation of the NZP CSI-RS resource set for each sub-setting may vary depending on whether a power offset value is set for each sub-setting and whether an NZP CSI-RS resource set is set.

[0259] When determining CQI, a higher-layer parameter related to time restrictions for channel measurements (e.g., timeRestrictionForChannelMeasurements) may be set. In this case, the terminal will need to derive a channel estimate for determining CSI based on the most recent CSI reference resource. If cell DTX is enabled for the base station, the cell DTX activation time may be considered.

[0260] CSI is derived based on a CSI reference resource. A CSI reference resource is defined as a group of downlink physical resource blocks corresponding to the band associated with the CSI derived in the frequency domain, and as a single downlink slot determined based on higher-layer parameters and subcarrier spacing in the time domain. After receiving a CSI-RS, the UE must transmit a CSI report no later than the CSI reference resource. If sub-configurations are configured for the CSI report, the CSI reference resource is considered for each sub-configuration.

[0261] When at least one of CQI index, PMI, and 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 DMRS symbols, the subcarrier spacing of BWP, the bandwidth for CQI reporting, the CP length and subcarrier spacing 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 CSI reporting, assumptions about antenna ports, EPRE, etc. may be determined based on the sub-configurations.

[0262] Next, the base station transmits at least one CSI-RS. Accordingly, the terminal can receive at least one CSI-RS and perform measurements. The at least one CSI-RS can be transmitted through a CSI-RS resource or resource set configured by the configuration information.

[0263] At this time, if the terminal is set to DRX, the terminal can perform measurements as follows. For example, if 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 if the terminal 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 reports L1-RSRP using a report configuration type set to periodic reporting and a report item set to cri-RSRP when drx-onDurationTimer has not started by a higher layer parameter (e.g., ps-TransmitPeriodicL1-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. In addition, the most recent CSI measurement opportunity occurs within the DRX active time for the CSI to be reported.

[0264] Meanwhile, the base station may perform cell DTX / DRX operation. In this case, during the inactive period of the cell DTX, the terminal configured as cell DTX does not expect to receive periodic CSI-RS and semi-static CSI-RS configured in the CSI reporting configuration associated with the report item including at least RI (rank indicator). When the cell DTX is activated for the serving cell, the most recent CSI measurement opportunity of the semi-static CSI-RS resource or the periodic CSI-RS resource occurs within the active periods of the cell DTX for CSI reporting, configured by the configuration information (e.g., CSI-ReportConfig) related to CSI reporting associated with the report item including at least RI.

[0265] A terminal that receives at least one CSI-RS determines CSI. In other words, the terminal performs CSI calculation. At this time, the terminal may perform the CSI calculation based on CSI processing criteria. The terminal may indicate the number of supported simultaneous CSI calculations, i.e., the number of CSI processing units (CPUs) that can be performed simultaneously, NCPU. The terminal may determine the number of CPUs for the corresponding CSI report based on at least one of the NCPU, the number of CPUs for each CSI report, the number of currently occupied CPUs, and the configuration of the report item. For example, for configuration information (e.g., CSI-ReportConfig) related to a CSI report 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 OFDM symbol, wherein the number of at least one symbol may be determined based on the CSI-RS resource or CSI-IM resource associated with the sub-configurations.

[0266] When configuration information related to CSI reporting (e.g., CSI-ReportConfig) includes multiple sub-configurations, the number of CPUs occupied by the CSI report is determined based on the number of CSI-RS resources corresponding to the sub-configurations. In this case, the number of CSI-RS resources may be determined based on the number of times 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.

[0267] A terminal that has determined CSI transmits a CSI report to the 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, SSBRI, LI, 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 via at least one of PUCCH or PUSCH.

[0268] When a terminal multiplexes a CSI report including a Part 2 CSI report on a PUCCH resource, 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 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.

[0269] 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 the list of sub-configurations provided by a higher layer parameter (e.g., csi-ReportSubConfigList) included in the information related to the CSI report (e.g., CSI-ReportConfig).

[0270] For a report configuration that contains 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 contains at least one CSI sub-report, the omission of Part 2 CSI is performed at the sub-configuration level within the same priority level. Here, a sub-configuration with a lower index value has a higher priority.

[0271] If a CSI report consists of two parts, the terminal may omit some of the Part 2 CSI. The omission of Part 2 CSI is in 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 is defined in Section 5.2.3. Part 2 CSI is omitted starting from the lowest priority level up to the Part 2 CSI code rate that is less than or equal to the code rate set by the higher layer parameter (e.g., maxCodeRate).

[0272] In addition, if the CQI request field in the DCI triggers CSI report(s) on the PUSCH, the first uplink symbol carrying the CSI report(s) must not precede a symbol specified after a certain interval from the last symbol of the PDCCH carrying the corresponding DCI. This can be understood as ensuring the CSI calculation time. In this case, if multiple sub-configurations are configured for the CSI report, the starting position of the aforementioned certain interval can be determined based on all triggered sub-configurations.

[0273]

[0274] Specific embodiments of the present disclosure

[0275] The present disclosure relates to a technique for reporting CSI based on sub-configurations of CSI reports in a wireless communication system. In particular, the present disclosure relates to a technique for transmitting CSIs, i.e., CSI sub-reports, for a plurality of sub-configurations while considering overhead, and proposes various embodiments for transmitting CSIs for sub-configurations. Hereinafter, in the present disclosure, ' / ' means 'and', 'or', or 'and / or', depending on the context.

[0276]

[0277] The base station can operate technologies such as controlling the on / off of the UE for a certain period of time in the time axis for the purpose of NES, controlling the transmission / reception resources for UE-common or UE-specific signals / channels, changing the amount of frequency-axis resources, controlling the transmission power, or turning on / off the antenna port (AP), TRP, etc. in the spatial domain. In the present disclosure, the listed technologies are referred to as 'NES technologies' or 'NES_tech', and the state in which at least one of the NES_techs is applied is referred to as 'NES mode' or 'NES state'. The base station can inform the terminal of which NES_tech(s) is applied for each NES_tech or NES_tech group [Approach 1], or can preset the corresponding NES_tech or NES_tech group(s) for each code-point of a specific indicator [Approach 2]. Here, specific indicators may be indicated by DCI or MAC CE, etc., or may be set by higher layer signaling.

[0278] For Approach 1, if at least one NES_tech is applied to the terminal, the state can be defined as an NES mode or NES state, and further, can be treated as a different NES mode or different NES state depending on which NES_tech is applied. The NES mode or NES state can be used as a concept to indicate whether at least one NES technology is applied, or further to indicate which NES technology(s) are applied. If the NES mode or NES state further indicates which NES technology(s) are applied, different NES modes or different NES states can include different combinations of NES_tech. For Approach 2, for example, if a 1-bit indicator is used, '0' can indicate that the corresponding NES_tech is not applied, and '1' can indicate that at least one NES_tech is applied. In this case, if '1' is indicated through the indicator, the state can be defined as an NES mode or NES state. As another example, when a 2-bit indicator is used, '00' can indicate that there is no corresponding NES_tech, '01' can indicate that at least one NES_tech_A is applied, '10' can indicate that at least one NES_tech_B is applied, and '11' can indicate that at least one NES_tech_C is applied. In this case, if a code-point other than '00' is indicated through the indicator, the state can be defined as an NES mode or NES state. Furthermore, the terminal can determine NES state #1 when '01' is identified, NES state #2 when '10' is identified, and NES state #3 when '11' is identified. Accordingly, whether it is an NES state and / or which NES state it is can be distinguished for each code-point.

[0279] For NES purposes, the base station can turn on / off certain spatial elements (e.g., APs, active transmit / receive chains, panels or TRPs) or adjust the power value for the downlink signal / channel. To dynamically apply various NES techniques in the spatial and power domains, the base station can associate CSI-RS resources or resource sets with different APs for a single CSI report setting (e.g., CSI-ReportConfig) or associate multiple power offsets (e.g., powerControlOffset parameter, which is a power offset value between PDSCH and CSI-RS, powerControlOffsetSS parameter, which is a power offset value between SSS and CSI-RS, etc.).

[0280] Specifically, at least one of the following CSI frameworks may be introduced:

[0281] - Framework #1: Multiple CSI-RS resource sets are linked for one CMR (channel measurement resource) or one IMR (interference measurement resource) in CSI-ReportConfig. Here, the CMR can be set by the resourcesForChannelMeasurement parameter, and the IMR can be set by the csi-IM-ResourcesForInterference or nzp-CSI-RS-ResourcesForInterference parameter. For example, for CMR, CSI-RS resource set #1 and CSI-RS resource set #2 are linked, and the CSI-RS resources belonging to CSI-RS resource set #1 can be configured with 16 APs (antenna ports, APs), and the CSI-RS resources belonging to CSI-RS resource set #2 can be configured with 8 APs.

[0282] - Framework #2: When a CSI-RS resource set linked to a CMR or an IMR in CSI-ReportConfig is configured, at least one CSI-RS resource(s) with different properties such as the number of APs and / or power offsets within the CSI-RS resource set are configured. For example, for a CSI-RS resource set #1 configured as CMR, CSI-RS resource #1 belonging to the CSI-RS resource set #1 may be configured with 16 APs, and CSI-RS resource #2 belonging to the same set may be configured with 8 APs. For example, for a CSI-RS resource set #1 configured as CMR, CSI-RS resource #1 belonging to the CSI-RS resource set #1 may be configured with the power offset #1 value, and CSI-RS resource #2 belonging to the same set may be configured with the power offset #2 value.

[0283] - Framework #3: When a CSI-RS resource set linked to a CMR or an IMR is configured in CSI-ReportConfig, some or all CSI-RS resource(s) within the set can be configured with multiple AP numbers and / or power offset values. For example, for a CSI-RS resource set #1 configured with a CMR, CSI-RS resource #1 belonging to the CSI-RS resource set #1 can be configured with up to 16 APs, and CSI reporting utilizing at least one AP among them can be configured. Alternatively, CSI-RS resource #2 belonging to the same CSI-RS resource set #1 can be configured with multiple power offset values, and CSI reporting utilizing all or part of the power offsets can be configured.

[0284] For the CSI frameworks described above, the CSI reporting method can be defined through at least one of the following options.

[0285] - Option #1: CSIs that consider multiple AP count values ​​and / or multiple power offset values ​​set in a single CSI report may all be included in a single CSI report. Alternatively, CSIs that consider multiple AP count values ​​and / or multiple power offset values ​​determined through the configuration / instruction of the base station may be included in a single CSI report. In this case, the AP count values ​​and / or power offset values ​​set / instructed through the base station may be some of the AP count values ​​and / or power offset values ​​set in the corresponding CSI report.

[0286] - Option #2: Even if multiple AP count values ​​and / or multiple power offset values ​​are set in one CSI report, CSI(s) considering a single AP count value and / or a single power offset value can be included in one CSI report through the base station's configuration / instruction.

[0287] - Option #3: Even if multiple AP count values ​​and / or multiple power offset values ​​are set in one CSI report, CSI(s) that consider some AP count values ​​and / or some power offset values ​​may be included in one CSI report through judgment / decision / selection of the terminal based on criteria set in advance by the base station or defined in advance.

[0288] Within a configuration for CSI reporting (e.g., CSI-ReportConfig), one or more L sub-configurations can be configured, and each sub-configuration can correspond to either a spatial domain adaptation pattern or a power domain adaptation pattern.

[0289] Here, the spatial domain adaptation pattern may correspond to a specific number of APs or an AP on / off pattern, or may correspond to a specific CSI-RS power value (e.g., the CSI-RS power value determined by the powerControlOffsetSS parameter, which is a power offset value between SSS and CSI-RS, because the turning off of some antenna elements corresponding to one AP may affect the CSI-RS power value). For example, when applying framework #2, the number of APs A1 or the power value P1 may be set for the CSI-RS index #n1 belonging to the resource set, and the number of APs A2 or the power value P2 may be set for the CSI-RS index #n2 belonging to the same resource set. In this case, the sub-configuration index #s1 is set to be linked with the CSI-RS index #n1, and the sub-configuration index #s2 is set to be linked with the CSI-RS index #n2, so that the spatial domain adaptation pattern can be set differently for each sub-configuration. When applying the Framework #3 method, when the number of A1 APs (or P1 / P2 power values) is set for the CSI-RS index #n1 belonging to the resource set, the number of A1 APs (or P1 power values) is linked to the sub-configuration index #s1, and the number of A2 APs (or P2 power values) that are less than the number of A1 APs that constitute the CSI-RS index #n1 is linked to the sub-configuration index #s2, so that the spatial domain adaptation pattern can be set differently for each sub-configuration.

[0290] In addition, the power domain adaptation pattern may mean that the power offset value (e.g., the power offset value determined by the powerControlOffset parameter, which is the power offset value between PDSCH and CSI-RS, the powerControlOffsetSS parameter, which is the power offset value between SSS and CSI-RS, etc.) is changed. For example, when applying framework #2, the P1 power value may be set for the CSI-RS index #n1 belonging to the resource set, and the P2 power value may be set for the CSI-RS index #n2 belonging to the same resource set. In this case, the sub-configuration index #s1 may be linked to the CSI-RS index #n1, and the sub-configuration index #s2 may be linked to the CSI-RS index #n2, so that the power domain adaptation pattern may be set differently for each sub-configuration.

[0291] In addition, when applying framework #3, P1 power values ​​and P2 power values ​​can be set for CSI-RS index #n1 belonging to the resource set. In this case, by setting sub-setting index #s1 to be linked to the P1 power value and sub-setting index #s2 to be linked to the P2 power value, the power domain adaptation pattern can be set differently for each sub-setting.

[0292] By utilizing one of the aforementioned options #1 / 2 / 3, the terminal may feed back to the base station a CSI report including CSI(s) corresponding to N sub-configurations, which are 1 to L, among L sub-configurations.

[0293]

[0294] As described above, L(>1) sub-configurations can be configured within the configuration information for CSI reporting (e.g., CSI-ReportConfig), and each sub-configuration can correspond to one space or power domain adaptation pattern. As described above, an example in which sub-configurations correspond to only one of two patterns within CSI-ReportConfig has been described, a configuration in which two patterns are mixed within a single CSI-ReportConfig is also possible. By configuring sub-configurations by combining multiple patterns within a single CSI-ReportConfig and controlling the terminal to feed back CSI information corresponding to the multiple sub-configurations, the base station can apply efficient space / power domain adaptation based on the feedback information.

[0295]

[0296] As in CSI Framework #2, CSI-RS resources with the same or similar power or antenna / spatial element on / off status within a single sub-configuration can be linked through a list parameter, and multiple sub-configurations can be included in a single CSI-ReportConfig. In addition, as in FIG. 18a, at least some of the multiple sub-configurations can be configured with different power offset values ​​while sharing the same list. Here, the power offset refers to the power difference between the CSI-RS and the PDSCH.

[0297] The lists associated with multiple sub-configurations included in one CSI-ReportConfig may be identical (e.g., the lists between sub-configuration #1 and sub-configuration #2 in the example of FIG. 18a are identical) or disjoint (e.g., the lists between sub-configuration #1 and sub-configuration #3 in the example of FIG. 18a are disjoint). In this case, the lists are disjoint between sub-configurations associated with different CSI-RS resource ID lists (e.g., between sub-configuration #1 and sub-configuration #3 in the example of FIG. 18a), and the power offset value settings (e.g., the power offset value, delta value, or index value corresponding to each resource) may be identical or different.

[0298] Between sub-configurations that share the same CSI-RS resource ID list (e.g., between sub-configuration #1 and sub-configuration #2 in the example of FIG. 18a), power offset value settings (e.g., power offset value, delta value, or index value corresponding to each resource) can be set differently. That is, one CSI-RS resource is associated with multiple sub-configurations, and the multiple sub-configurations can be set with different power offset values ​​and share the list.

[0299] If a specific sub-setting has a parameter (e.g., a list or CodebookConfig) that is not set, the related parameter may be inherited from another sub-setting that is related. For example, the other sub-setting may be the sub-setting with the largest or smallest index, or the sub-setting with the largest index among the sub-settings that contain the parameter setting and have smaller indices. For example, in Fig. 18a, if a list is not set for sub-setting #2, the same list as sub-setting #1 (e.g., {#1, #2}) may be applied to sub-setting #2 by inheriting the list setting from sub-setting #1, which has a lower index and a list setting than sub-setting #2.

[0300] Figure 18a illustrates an example in which spatial or power domain adaptation is applied separately, and only one of spatial or power adaptation may be applied depending on the presence or absence of parameters. For example, if no list parameters are present in any sub-setting, this may imply power domain adaptation. As another example, if only separate lists without power-related parameters are set for each sub-setting (e.g., in Figure 18a, only sub-setting #1 and sub-setting #3 are set and no power offset-related parameters are set), this may imply spatial domain adaptation.

[0301] As in CSI Framework #3, specific AP on / off patterns can be linked via bitmap parameters within a single sub-configuration, and multiple sub-configurations can be included in a single CSI-ReportConfig. Additionally, as shown in Figure 18b, a method of setting different power offsets while sharing the same bitmap can be used. Here, the power offset refers to the power difference between the CSI-RS and the PDSCH. In this case, in the example of Figure 18b, all CSI-RS resources can be linked to all sub-configurations.

[0302] The power offset value settings (e.g., power offset value, delta value, or index value corresponding to each resource) between sub-settings linked to different bitmap information (e.g., between sub-setting #1 and sub-setting #3 in the example of FIG. 18b) may be the same or different.

[0303] It may be desirable for the power offset values ​​(e.g., power offset values, delta values, or index values ​​corresponding to each resource) to be set differently between sub-settings that share the same bitmap (e.g., between sub-setting #1 and sub-setting #2 in the example of FIG. 18b).

[0304] If there are parameters (e.g., bitmap information or CodebookConfig information) that are not set in a specific sub-setting, the related parameters may be inherited from other related sub-settings (e.g., the sub-setting with the largest or smallest index or the sub-setting with the largest index among the smaller sub-setting indices for which the parameters are set). For example, in Fig. 18b, if a bitmap is not set in sub-setting #2, sub-setting #2 may inherit the bitmap setting information from sub-setting #1, which has a lower index than itself and includes a bitmap setting, so that the same bitmap (e.g., all 1's) may be applied to sub-setting #2.

[0305] Figure 18b is an example of joint operation of spatial or power domain adaptation, where only one adaptation, either spatial or power, can be applied depending on the presence or absence of parameters. For example, if no bitmap parameters are present in any of the sub-settings, this may simply mean power domain adaptation. As another example, if only bitmap information is set for each sub-setting without power-related parameters (e.g., in Figure 18b, only sub-settings #1 and #3 are set and no power offset-related parameters are set), this may simply mean spatial domain adaptation.

[0306]

[0307] According to the TS 38.214 standard document, at least one sub-configuration can be configured within a CSI reporting configuration, and within each sub-configuration, one or a combination of the following configurations can be configured:

[0308] - A list of IDs of one or more CSI-RS resource(s).

[0309] - Antenna port subset indication consisting of a bitmap

[0310] - Additional power offset delta from the EPRE offset between PDSCH and CSI-RS set within the CSI-RS resource configuration.

[0311] In the present disclosure, for convenience of description, a CSI reporting configuration including a sub-configuration in which an ID list of at least one CSI-RS resource(s) is set is referred to as Type 2 spatial domain (SD) adaptation, a CSI reporting configuration including a sub-configuration in which an antenna port subset indication configured as a bitmap is set is referred to as Type 1 spatial domain adaptation, and a CSI reporting configuration including a sub-configuration in which an additional power offset delta value is set is referred to as Power Domain (PD) adaptation. An ID list of at least one CSI-RS resource(s) and / or a power offset delta value may be set for sub-configuration(s) belonging to one CSI reporting configuration, which is referred to as Type 2 spatial domain+power domain adaptation. Additionally, an antenna port subset indication and / or a power offset delta value configured as a bitmap may be set for sub-configuration(s) belonging to one CSI reporting configuration, which is referred to as Type 1 spatial domain+power domain adaptation. For Type 1 spatial domain or power domain or Type 1 spatial domain+power domain adaptation, each CSI-RS resource can be associated with each of all sub-configurations configured within one CSI reporting configuration. For Type 2 spatial domain adaptation, each CSI-RS resource can be associated with only a single sub-configuration among multiple sub-configurations within one CSI reporting configuration. For Type 2 spatial domain+power domain adaptation, the list #1 of CSI-RS resource(s) configured in a sub-configuration within the same CSI reporting configuration and the list #2 of CSI-RS resource(s) configured in another sub-configuration may be the same or disjoint.

[0312] Meanwhile, if L sub-configurations are configured within a CSI reporting configuration, the UE can report CSIs corresponding to each of the L sub-configurations to the base station via a PUSCH / PUCCH. Among the L sub-configurations, only N (L or more and 1 or more) sub-configurations(es) can be activated or triggered via MAC-CE or DCI, in which case the UE can report CSIs corresponding to each of the N sub-configurations to the base station via a PUSCH / PUCCH. Specifically, for a CSI reporting configuration in which semi-persistent CSI reporting on PUCCH (SP CSI reporting on PUCCH) is configured, N sub-configurations(es) among the L sub-configurations configured via MAC-CE can be activated. Additionally, for a CSI reporting configuration in which SP CSI reporting on PUSCH or A(aperiodic)-CSI reporting is configured, N sub-configurations out of L sub-configurations configured via DCI may be triggered.

[0313]

[0314] AP mapping of CSI-RS

[0315] The following [Table 1] is the structure of the configuration information for CSI-RS resource mapping defined in the TS 38.331 standard document.

[0316]

[0317] [Table 2] below is a table related to the location of CSI-RS within a slot defined in the TS 38.211 standard document.

[0318] RowPortsXDensity ρcdm-Type CDM group index jk'l'113noCDM(k0,l0),(k0+4,l0),(k0+8,l0)0,0,000211, 0.5noCDM(k0,l0)000321, 0.5fd-CDM2(k0,l0)00,10441fd-CDM2(k0,l0),(k0+2,l0)0,10,10541fd-CDM2(k0,l0),(k0+4,l0)0,10,106 81fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0)0,1,2,30,10781fd-CDM2(k0,l0),(k1,l0),(k0,l0+1),(k1,l 0+1)0,1,2,30,10881cdm4-FD2-TD2(k0,l0),(k1,l0)0,10,10,19121fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k4,l0),(k5,l0)0,1,2,3,4,50,1010121cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0)0,1,20,10,111161, 0.5fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k0,l0+1),(k1,l0+1),(k2,l0+1),(k3,l0+1)0,1,2,3,4,5,6,70,1012161, 0.5cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0),(k3,l0)0,1,2,30,10,113241, 0.5fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k0,l0+1),(k1,l0+1),(k2,l0+1),(k0,l1), (k1,l1),(k2,l1),(k0,l1+1),(k1,l1+1),(k2,l1+1)0,1,2,3,4,5,6,7,8,9,10,110, 1014241, 0.5cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0),(k0,l1),(k1,l1),(k2,l1)0,1,2,3,4,50,10,115241, 0.5cdm8-FD2-TD4(k0,l0),(k1,l0),(k2,l0)0,1,20,10,1,2,316321, 0.5fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k0,l0+1),(k1,l0+1),(k2,l0+1),(k3,l0+1),(k0,l1),(k1,l1),(k2 ,l1),(k3,l1),(k0,l1+1),(k1,l1+1),(k2,l1+1),(k3,l1+1)0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,150,1017321, 0.5cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k0,l1),(k1,l1),(k2,l1),(k3,l1)0,1,2,3,4,5,6,70,10,118321, 0.5cdm8-FD2-TD4(k0,l0),(k1,l0),(k2,l0),(k3,l0)0,1,2,30,10,1,2, 3.

[0319] The AP mapping method of CSI-RS can be determined by a combination of the RRC parameters included in the configuration information of [Table 1] above and the table of [Table 2]. The current NR standard supports a total of 18 patterns (e.g., the first to the 18th rows in the table of [Table 2]). The AP mapping examples for each pattern are as follows, referring to the drawing.

[0320]

[0321] Figures 19a to 19r illustrate examples of AP mapping of CSI-RS according to various patterns applicable to the present disclosure. In Figures 19a to 19r, 0 to 13 on the horizontal axis of the grid structure represent OFDM symbol indices, respectively, and 0 to 11 on the vertical axis of the grid structure represent REs or subcarrier indices within one RB.

[0322] Fig. 19a illustrates an example of AP mapping of CSI-RS according to the first pattern. Fig. 19a illustrates a case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b3…b0] of the TS 38.211 specification) is set to 0010, i.e., the l0 value is set to 3 and the k0 value is set to 1. In Fig. 19a, the 3000th CSI-RS AP is mapped to REs indicated as ‘0’.

[0323] Figure 19b illustrates an example of AP mapping of CSI-RS according to the second pattern. Figure 19b illustrates that the firstOFDMSymbolInTimeDomain parameter is set to 3, and the frequencyDomainAllocation parameter (e.g., bitmap [b] of the TS 38.211 specification) is set to 3. 11 … b0]) is set to 0000 0000 0010, i.e., the l0 value is set to 3 and the k0 value is set to 1. In Fig. 19b, CSI-RS AP number 3000 is mapped to REs indicated as '0'.

[0324] Fig. 19c illustrates an example of AP mapping of CSI-RS according to the third pattern. Fig. 19c illustrates a case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 000010, i.e., the l0 value is set to 3 and the k0 value is set to 2. In Fig. 19c, two APs in the RE group (group) or CDM (code domain multiplexing) group indicated as '0' are CDMed by applying the frequency axis OCC (orthogonal cover code), and CSI-RS APs numbered 3000 and 3001 are mapped.

[0325] Fig. 19d illustrates an example of AP mapping of CSI-RS according to the fourth pattern. Fig. 19d illustrates a case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b2…b0] of the TS 38.211 specification) is set to 001, i.e., the l0 value is set to 3 and the k0 value is set to 0. In Fig. 19d, two APs are CDMed by applying the frequency axis OCC to each of the RE groups or CDM groups indicated as '0' or '1', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, and CSI-RS APs 3002 and 3003 are mapped to CDM group 1.

[0326] Fig. 19e illustrates an example of AP mapping of CSI-RS according to the fifth pattern. Fig. 19e illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 000010, i.e., the l0 value is set to 3 and the k0 value is set to 2. In Fig. 19e, two APs are CDMed by applying the frequency axis OCC to each of the RE groups or CDM groups indicated by '0' or '1', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, and CSI-RS APs 3002 and 3003 are mapped to CDM group 1.

[0327] Fig. 19f illustrates an example of AP mapping of CSI-RS according to the sixth pattern. Fig. 19f illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101101, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 4, 6, and 10, respectively. In FIG. 19f, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, and CSI-RS APs 3006 and 3007 are mapped to CDM group 3.

[0328] Fig. 19g illustrates an example of AP mapping of CSI-RS according to the seventh pattern. Fig. 19g illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 010001, i.e., the value of l0 is set to 3 and the values ​​of k0 and k1 are set to 0 and 8, respectively. In FIG. 19g, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, and CSI-RS APs 3006 and 3007 are mapped to CDM group 3.

[0329] Fig. 19h illustrates an example of AP mapping of CSI-RS according to the 8th pattern. Fig. 19h illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 010001, i.e., the value of l0 is set to 3, and the values ​​of k0 and k1 are set to 0 and 8, respectively. In Fig. 19h, four APs are CDMed by applying the frequency axis OCC to each of the RE groups or CDM groups indicated as '0' or '2', and accordingly, CSI-RS APs 3000 to 3003 are mapped to CDM group 0, and CSI-RS APs 3004 and 3007 are mapped to CDM group 1.

[0330] Fig. 19i illustrates an example of AP mapping of CSI-RS according to the ninth pattern. Fig. 19i illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 111111, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, k3, k4, and k5 are set to 0, 2, 4, 6, and 8, respectively. In FIG. 19i, two APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4' or '5', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5.

[0331] Fig. 19j illustrates an example of AP mapping of CSI-RS according to the 10th pattern. Fig. 19j illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 010101, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, and k2 are set to 0, 4, and 8, respectively. In FIG. 19j, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', or '2', and accordingly, CSI-RS APs 3000 to 3003 are mapped to CDM group 0, CSI-RS APs 3004 to 3007 are mapped to CDM group 1, and CSI-RS APs 3008 to 3011 are mapped to CDM group 2.

[0332] Fig. 19k illustrates an example of AP mapping of CSI-RS according to the 11th pattern. Fig. 19k illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In FIG. 19k, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6' or '7', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5. CSI-RS APs 3012 and 3013 are mapped to CDM group 6, and CSI-RS APs 3014 and 3015 are mapped to CDM group 7.

[0333] Fig. 19l illustrates an example of AP mapping of CSI-RS according to the 12th pattern. Fig. 19l illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In FIG. 19l, four APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and accordingly, CSI-RS APs 3000 to 3003 are mapped to CDM group 0, CSI-RS APs 3004 to 3007 are mapped to CDM group 1, CSI-RS APs 3008 to 3011 are mapped to CDM group 2, and CSI-RS APs 3012 to 3015 are mapped to CDM group 3.

[0334] Fig. 19m illustrates an example of AP mapping of CSI-RS according to the 13th pattern. Fig. 19m illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 100011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, and k2 are set to 0, 8, and 10, respectively. In FIG. 19m, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10' or '11', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CDM group 5. CSI-RS APs 3010 and 3011 are mapped, CSI-RS APs 3012 and 3013 are mapped to CDM group 6, CSI-RS APs 3014 and 3015 are mapped to CDM group 7, CSI-RS APs 3016 and 3017 are mapped to CDM group 8, CSI-RS APs 3018 and 3019 are mapped to CDM group 9, CSI-RS APs 3020 and 3021 are mapped to CDM group 10, and CSI-RS APs 3022 and 3023 are mapped to CDM group 11.

[0335] Fig. 19n illustrates an example of AP mapping of CSI-RS according to the 14th pattern. Fig. 19n illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 100011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, and k2 are set to 0, 2, and 10, respectively. In FIG. 19n, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4' or '5', and thus CSI-RS APs no. 3000 to 3003 are mapped to CDM group no. 0, CSI-RS APs no. 3004 to 3007 are mapped to CDM group no. 1, CSI-RS APs no. 3008 to 3011 are mapped to CDM group no. 2, CSI-RS APs no. 3012 to 3015 are mapped to CDM group no. 3, CSI-RS APs no. 3016 to 3019 are mapped to CDM group no. 4, and CSI-RS APs no. 3020 to 3023 are mapped to CDM group no. 5.

[0336] Fig. 19o illustrates an example of AP mapping of CSI-RS according to the 15th pattern. Fig. 19o illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 001011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, and k2 are set to 0, 2, and 6, respectively. In FIG. 19o, eight APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', or '2', and accordingly, CSI-RS APs 3000 to 3007 are mapped to CDM group 0, CSI-RS APs 3008 to 3015 are mapped to CDM group 1, and CSI-RS APs 3016 to 3023 are mapped to CDM group 2.

[0337] Fig. 19p illustrates an example of AP mapping of CSI-RS according to the 13th pattern. Fig. 19p illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively.In FIG. 19p, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14' or '15', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, and CSI-RS APs 3008 and 3009 are mapped to CDM group 4. CSI-RS APs 3009 are mapped, CSI-RS APs 3010 and 3011 are mapped to CDM group 5, CSI-RS APs 3012 and 3013 are mapped to CDM group 6, CSI-RS APs 3014 and 3015 are mapped to CDM group 7, CSI-RS APs 3016 and 3017 are mapped to CDM group 8, CSI-RS APs 3018 and 3019 are mapped to CDM group 9, CSI-RS APs 3020 and 3021 are mapped to CDM group 10, CSI-RS APs 3022 and 3023 are mapped to CDM group 11, and CSI-RS APs 3024 and 3025 are mapped to CDM group 12. APs are mapped, CSI-RS APs 3026 and 3027 are mapped to CDM group 13, CSI-RS APs 3028 and 3029 are mapped to CDM group 14, and CSI-RS APs 3030 and 3031 are mapped to CDM group 15.

[0338] Fig. 19q illustrates an example of AP mapping of CSI-RS according to the 14th pattern. Fig. 19q illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 110011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 8, and 10, respectively. In FIG. 19q, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6' or '7', and thus CSI-RS APs no. 3000 to 3003 are mapped to CDM group no. 0, CSI-RS APs no. 3004 to 3007 are mapped to CDM group no. 1, CSI-RS APs no. 3008 to 3011 are mapped to CDM group no. 2, CSI-RS APs no. 3012 to 3015 are mapped to CDM group no. 3, CSI-RS APs no. 3016 to 3019 are mapped to CDM group no. 4, and CSI-RS APs no. 3020 to 3023 are mapped to CDM group no. 5. CSI-RS APs numbered 3024 to 3027 are mapped to CDM group 6, and CSI-RS APs numbered 3028 to 3031 are mapped to CDM group 7.

[0339] Fig. 19r illustrates an example of AP mapping of CSI-RS according to the 15th pattern. Fig. 19r illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In FIG. 19r, eight APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and accordingly, CSI-RS APs 3000 to 3007 are mapped to CDM group 0, CSI-RS APs 3008 to 3015 are mapped to CDM group 1, CSI-RS APs 3016 to 3023 are mapped to CDM group 2, and CSI-RS APs 3024 to 3031 are mapped to CDM group 3.

[0340]

[0341] [Example #1] Definition of a CSI reference resource when a terminal calculates / reports at least one CSI corresponding to at least one sub-configuration for one CSI report.

[0342] Looking at the TS 38.214 standard document, when defining the time axis CSI reference resource as follows, n is defined depending on whether the number of CSI-RS resources for P / SP-CSI (periodic / semi-persistent CSI) reporting is 1 or plural. CSI_ref The values ​​are defined differently.

[0343] ----------------------------------------------------------------

[0344] 5.2.2.5 CSI Reference Resource Definition

[0345] The CSI reference resources for the serving cell are defined as follows:

[0346] - In the frequency domain, the CSI reference resource is defined by a group of downlink physical resource blocks corresponding to the band to which the derived CSI is related.

[0347] - The CSI reference resource for CSI reporting of uplink slot n' in the time domain is a single downlink slot. is defined by , where is a parameter set by the upper layer as specified in [6 TS 38.213] section 4.2, Is For the subcarrier spacing setting, it has a value of 0 for frequency range 1.

[0348] - And, and are the subcarrier spacing settings for downlink and uplink, respectively. and is determined by the ca-SlotOffset set by the upper layer for the cell transmitting the uplink and downlink, as defined in section 4.5 of [4, TS 38.211].

[0349] - Regarding periodic and semi-periodic CSI reporting

[0350] - When a single CSI-RS / SSB resource is set up for channel measurement, n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot, or

[0351] - When multiple CSI-RS / SSB resources are set for channel measurement, n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot.

[0352] - For aperiodic CSI reporting, if the UE is instructed by DCI to report CSI in the same slot as the CSI request, n CSI_ref ensures that the reference resource is located in the same valid downlink slot as the corresponding CSI request, otherwise n CSI_ref Is As a value less than or equal to slot nn CSI_ref corresponds to a valid downlink slot, where Z' corresponds to the delay requirement defined in Section 5.4.

[0353] - When periodic or semi-periodic CSI-RS / CSI-IM or SSB is used for channel / interference measurement, the UE shall not expect to measure channel / interference on CSI-RS / CSI-IM / SSB for which the last OFDM symbol is received up to Z' symbols before the transmission time of the first OFDM symbol of an aperiodic CSI report.

[0354] A slot in a serving cell is considered a valid downlink slot if:

[0355] - Contains downlink or flexible symbols set to at least one upper layer.

[0356] - Does not fall within the measurement gap set for the UE.

[0357] If there is no valid downlink slot for the CSI reference resource corresponding to the CSI reporting setting in the serving cell, the CSI reporting for the serving cell in uplink slot n' is omitted.

[0358] ----------------------------------------------------------------

[0359] According to the aforementioned specification document, n CSI_ref The value is the first value (e.g. ) or a second value (e.g. ) can be defined as the smallest value corresponding to a valid downlink slot in the above range. That is, the first value or the second value is n CSI_ref The minimum value of the value is set. In this case, the second value used when multiple CSI-RS resources are set is greater than the first value used when a single CSI-RS resource is set. This is because when multiple CSI-RS resources are set for a single CSI report, the time or complexity required for the terminal to calculate / report the corresponding CSI(s) may be greater than when a single CSI-RS resource is set.

[0360] However, when multiple sub-configurations are set for CSI reporting, the time or complexity required to calculate / report CSI(s) may increase, similar to when multiple CSI-RS resources are set. Therefore, the present disclosure, n CSI_ref In selecting the minimum value of the value as the first value or the second value, the following embodiments are proposed that further consider not only the CSI-RS resource but also the number and status of sub-configurations set in the related CSI report.

[0361]

[0362] FIG. 20 illustrates an example of a procedure for determining a CSI reference resource according to one embodiment of the present disclosure. FIG. 20 illustrates a method performed by a terminal.

[0363] Referring to FIG. 20, in step S2001, the terminal receives configuration information for CSI reporting. The configuration information may include information related to CSI-RS resources or resource sets, the number of APs, power offsets, etc. related to CSI reporting. In addition, the configuration information may include multiple sub-configurations, and the sub-configurations may be related to different subsets of the number of APs or power offset values.

[0364] In step S2003, the terminal receives control information related to at least one sub-configuration. For example, the control information may indicate activation or triggering of at least one sub-configuration configured for CSI reporting. However, in some cases, this step may be omitted.

[0365] In step S2005, the terminal determines a CSI reference resource based on the number of sub-configuration(s). The CSI reference resource refers to the latest downlink slot in which the terminal can receive a reference signal (e.g., CSI-RS, SSB, etc.) to report a CSI measurement result. That is, the CSI reference resource indicates up to which slot the terminal can use the reference signal to transmit a CSI report at the configured time. Specifically, the CSI reference resource includes the number of an uplink slot for transmitting a CSI report, information related to an uplink subcarrier spacing, information related to a downlink subcarrier spacing, information related to carrier aggregation (CA) (e.g., slot offset between Pcell / PScell, offset of subcarrier spacing between carriers, etc.), information related to a scheduling offset, information related to a subcarrier spacing for a scheduling offset, and information related to a slot spacing (e.g., n CSI_ref ) may be determined based on at least one of the following: At this time, according to various embodiments, the terminal may determine information related to the slot interval within a range greater than or equal to the minimum value determined based on the number of activated sub-settings.

[0366] As described with reference to FIG. 20, the terminal can determine a CSI reference resource based on the number of activated sub-configurations. Subsequently, although not illustrated in FIG. 20, the terminal can determine CSI(s) using a reference signal received in the CSI reference resource or at least one slot prior thereto, and transmit a CSI report including the CSI(s). At this time, the CSI report can include CSI for each sub-configuration.

[0367] Hereinafter, the present disclosure describes more specific embodiments for determining information related to slot spacing among the procedures illustrated in FIG. 20.

[0368]

[0369] [Example #1-1] Even if only a single CSI-RS resource is configured in one CSI report, multiple sub-configurations may be configured according to spatial domain adaptation and / or power domain adaptation, as in FIG. 18b. In this case, the terminal may perform calculation / reporting on CSIs corresponding to multiple sub-configurations. Considering calculating / reporting multiple CSIs, even if a single CSI-RS resource (e.g., a CSI-RS resource for CMR) is configured for a CSI report, the terminal may perform calculation / reporting on a P / SP-CSI report corresponding to a CSI report for which multiple sub-configurations are configured, as if multiple CSI-RS resources (e.g., CSI-RS resources for CMR) are configured. CSI_ref The value is such that the CSI reference resource corresponds to a valid downlink slot. It can be defined as the smallest value in the upper range.

[0370] In particular, in the case of P-CSI reporting or when activation / triggering via MAC-CE and / or DCI to select only N sub-configurations among L sub-configurations configured for SP-CSI reporting is not possible, the terminal may report CSIs corresponding to all configured L sub-configurations to the base station at once. Even if a single CSI-RS resource is configured for the corresponding CSI report, calculating / reporting CSI corresponding to multiple L sub-configurations may require the same level of terminal implementation complexity as when multiple CSI-RS resources are allocated in a conventional CSI reporting setting. Therefore, considering the terminal implementation complexity, if the number of sub-configurations(s) configured or corresponding to the CSI report exceeds 1, or the sum of the numbers of CSI-RS resources corresponding to each sub-configuration exceeds 1 (e.g., in the case of Type 1 spatial domain adaptation and / or power domain adaptation, when one CSI-RS is configured and two sub-configurations are configured, the sum of the numbers of CSI-RS resources corresponding to each sub-configuration is 2), as if multiple CSI-RS resources (e.g., CSI-RS resources for CMR) are configured, n CSI_ref The value is such that the CSI reference resource corresponds to a valid downlink slot. It can be defined as the smallest value in the above range.

[0371] Conversely, if a single CSI-RS resource (e.g., a CSI-RS resource for CMR) is configured in the CSI report and the number of configurations or corresponding sub-configurations is 1, or the sum of the numbers of CSI-RS resources corresponding to each sub-configuration is 1 (e.g., if 1 CSI-RS is configured and 1 sub-configuration is configured, the sum of the numbers of CSI-RS resources corresponding to each sub-configuration is 1), it is as if a single CSI-RS resource for CMR is configured, n CSI_refThe value is such that the CSI reference resource corresponds to a valid downlink slot. It can be defined as the smallest value in the above range.

[0372] If the above-mentioned embodiment #1-1 is applied, n in the TS 38.214 standard document CSI_ref The definition can be described as follows.

[0373] ----------------------------------------------------------------

[0374] 5.2.2.5 CSI Reference Resource Definition

[0375] The CSI reference resources for the serving cell are defined as follows:

[0376] - In the frequency domain, the CSI reference resource is defined by a group of downlink physical resource blocks corresponding to the band to which the derived CSI is related.

[0377] - The CSI reference resource for CSI reporting of uplink slot n' in the time domain is a single downlink slot. is defined by , where is a parameter set by the upper layer as specified in [6 TS 38.213] section 4.2, Is For the subcarrier spacing setting, it has a value of 0 for frequency range 1.

[0378] - And, and are the subcarrier spacing settings for downlink and uplink, respectively. and is determined by the ca-SlotOffset set by the upper layer for the cell transmitting the uplink and downlink, as defined in section 4.5 of [4, TS 38.211].

[0379] - Regarding periodic and semi-periodic CSI reporting

[0380] - If a single CSI-RS / SSB resource is configured for channel measurement and no sub-configuration is provided, n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot, or

[0381] -If a single CSI-RS / SSB resource is configured for channel measurement and sub-configuration is provided, n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot, or

[0382] - When multiple CSI-RS / SSB resources are set for channel measurement, n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot.

[0383] ----------------------------------------------------------------

[0384] [Example #1-2] Meanwhile, in the case of SP-CSI reporting, even if multiple (e.g., L) sub-configurations are set for one CSI report, only L or fewer (e.g., N) sub-configurations can be activated using MAC-CE or DCI. Considering this, when N=1, for the SP-CSI report, it is as if a single CSI-RS resource (e.g., CSI-RS resource for CMR) is set, n CSI_ref The value is such that the CSI reference resource corresponds to a valid downlink slot. It can be defined as the smallest value in the above range. In addition, if N>1, for the corresponding SP-CSI report, it is as if multiple CSI-RS resources (e.g., CSI-RS resources for CMR) are set, n CSI_ref The value is such that the CSI reference resource corresponds to a valid downlink slot. It can be defined as the smallest value in the above range. The above-described embodiment can be applied under the constraint that a single CSI-RS resource (e.g., a CSI-RS resource for CMR) is configured for one CSI report.

[0385] Meanwhile, in the case of SP-CSI reporting, activation / triggering may be performed through MAC-CE and / or DCI that selects only N sub-configurations among the configured L sub-configurations. Accordingly, the terminal may receive the corresponding MAC-CE and / or DCI and report CSIs corresponding to the activated / triggered N sub-configurations to the base station. For the corresponding CSI report, even if a single CSI-RS resource is configured, in the case of calculating / reporting CSIs corresponding to multiple N sub-configurations, or calculating / reporting CSIs for multiple CSI-RS resources having a single sub-configuration, the same level of terminal implementation complexity as in the case of multiple CSI-RS resources being allocated in the existing CSI reporting configuration may be required. Therefore, considering such terminal implementation complexity, if the number of activated / triggered sub-configuration(s) for CSI reporting exceeds 1, or the sum of the numbers of CSI-RS resources corresponding to each sub-configuration exceeds 1 (e.g., in particular, in case of type 1 spatial domain adaptation and / or power domain adaptation, when one CSI-RS is configured and two sub-configurations are configured, the sum of the numbers of CSI-RS resources corresponding to each sub-configuration is 2), as if multiple CSI-RS resources (e.g., CSI-RS resources for CMR) are configured, n CSI_ref The value is such that the CSI reference resource corresponds to a valid downlink slot. can be defined as the smallest value in the above range. Conversely, when the number of CSI-RS resource(s) configured for a CSI report (e.g., CSI-RS resource(s) for CMR) is 1, the number of configured, corresponding, or activated / triggered sub-configurations is 1, and the number of CSI-RSs corresponding to the corresponding sub-configuration is 1, or the sum of the numbers of CSI-RS resources corresponding to each sub-configuration is 1 (e.g., in particular, in the case of Type 2 spatial domain adaptation, when two CSI-RSs are configured, two sub-configurations are configured, one CSI-RS resource is associated with each sub-configuration, and only one sub-configuration is activated / triggered, the sum of the numbers of CSI-RS resource(s) corresponding to the corresponding CSI report is 1), such that multiple CSI-RS resources (e.g., CSI-RS resources for CMR) are configured, n CSI_ref The value is such that the CSI reference resource corresponds to a valid downlink slot. It can be defined as the smallest value in the above range.

[0386] If the above-mentioned embodiment #1-2 is applied, n in the TS 38.214 standard document CSI_ref The definition can be described as follows.

[0387] ----------------------------------------------------------------

[0388] 5.2.2.5 CSI Reference Resource Definition

[0389] The CSI reference resources for the serving cell are defined as follows:

[0390] - In the frequency domain, the CSI reference resource is defined by a group of downlink physical resource blocks corresponding to the band to which the derived CSI is related.

[0391] - The CSI reference resource for CSI reporting of uplink slot n' in the time domain is a single downlink slot. is defined by , where is a parameter set by the upper layer as specified in [6 TS 38.213] section 4.2, Is For the subcarrier spacing setting, it has a value of 0 for frequency range 1.

[0392] - And, and are the subcarrier spacing settings for downlink and uplink, respectively. and is determined by the ca-SlotOffset set by the upper layer for the cell transmitting the uplink and downlink, as defined in section 4.5 of [4, TS 38.211].

[0393] - For periodic and semi-static CSI reports that do not include the L sub-configuration list provided by the upper-layer parameter [csi-ReportSubConfigList],

[0394] - When a single CSI-RS / SSB resource is set for channel measurement, n CSI_ref Is The smallest value greater than or equal to, which corresponds to a valid downlink slot, or

[0395] - When multiple CSI-RS / SSB resources are set for channel measurement, n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot.

[0396] - For periodic CSI reports containing a list of L sub-configurations provided by the upper-layer parameter [csi-ReportSubConfigList],

[0397] - If, here, is the total number of CSI-RS resources for channel measurements corresponding to the i-th sub-setting, and n CSI_ref Is The smallest value greater than or equal to, which corresponds to a valid downlink slot, or

[0398] - If, here, is the total number of CSI-RS resources for channel measurement corresponding to the i-th sub-set, and n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot.

[0399] - For semi-static CSI reports containing a list of L sub-configurations provided by the upper layer parameter [csi-ReportSubConfigList],

[0400] - If, here, is the total number of CSI-RS resources for channel measurements corresponding to the i-th sub-configuration, where the i-th sub-configuration is taken from the indicated N sub-configurations among the L sub-configurations included in CSI-ReportConfig, where and And,n CSI_ref Is The smallest value greater than or equal to, which corresponds to a valid downlink slot, or

[0401] - If, here, is the total number of CSI-RS resources for channel measurement corresponding to the i-th sub-configuration, where the i-th sub-configuration is taken from the indicated N sub-configurations among the L sub-configurations included in CSI-ReportConfig, where and and,n CSI_ref Is The smallest value greater than or equal to , which corresponds to a valid downlink slot.

[0402] Here, for aperiodic CSI reporting, if the DCI instructs the UE to report CSI in the same slot as the CSI request, n CSI_ref ensures that the reference resource is located in the same valid downlink slot as the corresponding CSI request, otherwise, n CSI_ref Is The smallest value greater than or equal to slot nn CSI_ref Let Z' correspond to a valid downlink slot, where Z' corresponds to the delay requirement defined in Section 5.4.

[0403] - When periodic or semi-periodic CSI-RS / CSI-IM or SSB is used for channel / interference measurement, the UE shall not expect to measure channel / interference on CSI-RS / CSI-IM / SSB for which the last OFDM symbol is received up to Z' symbol before the transmission time of the first OFDM symbol of an aperiodic CSI report.

[0404] ----------------------------------------------------------------

[0405]

[0406] [Example #2] A method for counting the number of CSI-RS resources and / or ports when one CSI-RS resource can be linked with multiple sub-configurations.

[0407] The NR specification defines counting of CSI-RS resources and / or ports through the following expressions:

[0408] ----------------------------------------------------------------

[0409] If a CSI-RS resource is referenced N times by at least one CSI reporting configuration, the CSI-RS resource and the CSI-RS ports within the CSI-RS resource are counted N times.

[0410] ----------------------------------------------------------------

[0411] That is, when one CSI-RS resource is associated with multiple CSI reporting configurations, the number of CSI-RS resources and ports is counted as the number of corresponding CSI reporting configurations. This counting of the number of CSI-RS resources and ports is necessary due to the limitation of the capability of the terminal. Specifically, since the terminal cannot store more than a certain number of resources / ports when storing CSI-RS(es) in the memory, the base station receives information related to the number of resources / ports through the terminal capability information (e.g., maxNumberSimultaneousNZP-CSI-RS-PerCC, totalNumberPortsSimultaneousNZP-CSI-RS-PerCC, etc.), and can set the CSI reporting configuration so as not to exceed the capability of the terminal based on the counting rule as described above.

[0412] As the CSI framework for NES is enhanced, multiple sub-configurations can be configured for a single CSI reporting configuration, and these sub-configurations can be linked to the same CSI-RS resource. Therefore, it is necessary to define CSI-RS resource / port counting rules that take these sub-configurations into account.

[0413]

[0414] FIG. 21 illustrates an example of a procedure for providing configuration information for CSI reporting according to one embodiment of the present disclosure. FIG. 21 illustrates a method performed by a base station.

[0415] Referring to FIG. 21, in step S2101, the base station receives capability information from the terminal. For this purpose, although not illustrated in FIG. 21, the base station may transmit a message requesting capability information to the terminal. The capability information may include information on functional and hardware capabilities related to communication of the terminal. For example, the capability information may include information related to the memory capacity available for CSI measurement of the terminal. Specifically, the capability information may include information related to the maximum number of NZP-CSI-RSs that the terminal can process simultaneously per CC or the total number of NZP-CSI-RS ports.

[0416] In step S2103, the base station determines a configuration related to CSI reporting based on capability information. In other words, the base station determines various parameters related to CSI reporting of the terminal based on capability information. For example, the various parameters related to CSI reporting include at least one of a CSI-RS resource, ports related to the CSI-RS resource, a power offset, a resource for CSI reporting, a method of CSI reporting (e.g., P, AP, SP), and items of CSI reporting. At this time, the base station may determine the parameters such that the counting value of the CSI-RS resource(s) and CSI-RS port(s) configured for the terminal for one CSI report does not exceed a threshold identified through the capability information of the terminal. Here, according to various embodiments, the base station may count the CSI-RS resource(s) and CSI-RS port(s) based on the sub-configuration(s).

[0417] In step S2105, the base station transmits configuration information for CSI reporting. The configuration information includes information related to the CSI reporting configuration determined in step S2103, i.e., various parameters. Specifically, the configuration information may include information related to CSI-RS resources or resource sets, the number of APs, power offsets, etc. related to CSI reporting. In addition, the configuration information may include multiple sub-configurations, and the sub-configurations may be related to different subsets of the number of APs or power offset values.

[0418] As described with reference to Figure 21, the base station can determine settings for CSI reporting based on the terminal's capability information and transmit the setting information. Subsequently, although not illustrated in Figure 21, the base station can receive a CSI report containing at least one CSI from the terminal.

[0419]

[0420] FIG. 22 illustrates an example of a procedure for receiving configuration information for CSI reporting according to one embodiment of the present disclosure. FIG. 22 illustrates a method performed by a terminal.

[0421] Referring to FIG. 22, in step S2201, the terminal transmits capability information to the base station. For this purpose, although not illustrated in FIG. 22, the terminal may receive a message requesting capability information from the base station. The capability information may include information on functional and hardware capabilities related to communication of the terminal. For example, the capability information may include information related to the memory capacity available for CSI measurement of the terminal. Specifically, the capability information may include information related to the maximum number of NZP-CSI-RSs that the terminal can process simultaneously per CC or the total number of NZP-CSI-RS ports.

[0422] In step S2203, the terminal receives configuration information for CSI reporting. The configuration information may include information related to CSI-RS resources or resource sets, the number of APs, power offsets, etc. related to CSI reporting. In addition, the configuration information may include multiple sub-configurations, and the sub-configurations may be related to different subsets of the number of APs or power offset values. Here, at least some of the parameters included in the aforementioned configuration information may be determined by the base station based on the capability information transmitted in step 2201.

[0423] As described with reference to FIG. 22, the terminal can transmit capability information and receive configuration information for CSI reporting. At this time, the terminal can determine a threshold for the counting value of the CSI-RS resource(s) and CSI-RS port(s) related to one CSI report determined based on the capability information, and can check whether the counting value of the CSI-RS resource(s) and CSI-RS port(s) calculated by the parameters included in the configuration from the base station does not exceed the threshold. At this time, the terminal may not expect that the CSI report is configured by the base station to exceed the counting value calculated based on the reported capability information when making a judgment for each slot.

[0424]

[0425] Hereinafter, the present disclosure describes more specific embodiments for counting CSI-RS resource(s) and CSI-RS port(s) among the procedures illustrated in FIGS. 21 and 22. The embodiments below may be applied to counting CSI-RS resource(s) and CSI-RS port(s) of a base station and / or a terminal.

[0426]

[0427] [Example #2-1] We would like to propose the following counting rule for the proposed CSI-RS resource. When X CSI reporting configuration(s) are configured for one CSI-RS resource, and the number of sub-configurations(es) linked to the corresponding CSI-RS resource within the kth CSI reporting configuration is expressed as N(k), CSI-RS resource counting can be defined as N(1)+N(2)+…+N(X). Here, N(1) means the number of sub-configurations(es) linked to the corresponding CSI-RS resource in the 1st CSI-RS reporting configuration in which the corresponding CSI-RS resource is configured, and N(X) means the number of sub-configurations(es) linked to the corresponding CSI-RS resource in the Xth CSI-RS reporting configuration in which the corresponding CSI-RS resource is configured. If there is no sub-configuration configured for the kth CSI-RS reporting configuration, the value of N(k) is 1. Specifically, the N(k) value, i.e., the number of sub-configurations associated with the CSI-RS resource, may be determined based on one or a combination of the embodiments described below, based on the capability of the terminal or the CSI reporting type (e.g., P / SP / AP CSI reporting) or the CSI-RS resource type (e.g., P / SP / AP CSI-RS resource).

[0428] [Example #2-1-1] Even if multiple sub-settings are set or activated for the kth CSI report setting (e.g., CSI-ReportConfig), the N(k) value is always considered as 1.

[0429] [Example #2-1-2] If multiple (e.g. L) sub-settings are set for the kth CSI reporting setting, the value of N(k) is always considered as L, regardless of how many of the L are actually activated / triggered.

[0430] [Example #2-1-3] Even if multiple (e.g. L) sub-settings are set for the kth CSI reporting setting, if N out of L are actually activated / triggered via MAC-CE or DCI, the N(k) value is considered as N.

[0431] [Embodiment #2-1-4] In the above-described embodiments, when sub-configurations that differ only in power offset (e.g., power offset between CSI-RS and PDSCH) are set for the same CSI-RS resource, N(k) related to the corresponding sub-configurations is counted as 1. For example, when Embodiment #2-1-2 is applied to the CSI reporting configuration set as in FIG. 18b, N(k)=4, but sub-configuration #1 and sub-configuration #2 differ only in power offset, and also sub-configuration #3 and sub-configuration #4 differ only in power offset, so N(k) related to the corresponding sub-configurations can be counted as 2. As another example, when only sub-configuration #1 and sub-configuration #2 are activated in FIG. 18b, N(k)=2 when Embodiment #2-1-3 is applied. However, if only sub-setting #1 and sub-setting #2 are activated in FIG. 18b, then according to the present embodiment, sub-setting #1 and sub-setting #2 differ only in power offset, and thus can be counted as N(k)=1.

[0432] [Example #2-1-5] When multiple (e.g., L) sub-configurations are configured for the k-th CSI reporting configuration, in particular, for SP-CSI reporting on PUSCH or AP-CSI reporting, only M sub-configurations out of L can be activated via DCI. For example, when multiple sub-configurations are configured for the corresponding CSI reporting configuration, the CSI reporting configuration and sub-configuration(s) linked to each code-point of the CSI request field of the DCI can be configured / indicated in advance, and the UE can feed back the CSI corresponding to the CSI reporting configuration and sub-configuration(s) linked to the indicated code-point to the base station via an uplink channel (e.g., PUSCH). At this time, the maximum number of sub-configurations(es) among all code-points of the CSI request field linked to the k-th CSI reporting configuration can be determined as the N(k) value.

[0433] For example, if the code-points of the CSI request field linked to the kth CSI reporting configuration in which a total of 4 sub-configurations are set are '001', '110', and '111', and '001' is linked to 2 sub-configurations in the kth CSI reporting configuration, '110' is linked to 1 sub-configuration in the kth CSI reporting configuration, and '111' is linked to 3 sub-configurations in the kth CSI reporting configuration, the corresponding N(k) value can be determined as 3. That is, even if 4 sub-configurations are set, since the maximum number of sub-configurations that can be triggered via DCI is 3, it is desirable to count only 3 CSI-RS resource(s).

[0434] In this example, it is assumed that all four sub-configurations are associated with the CSI-RS resource, particularly Type 1 spatial domain adaptation and / or power domain adaptation. The same embodiment can also be applied to Type 2 spatial domain adaptation or Type 2 spatial domain + power domain adaptation. For example, if CSI-RS resource ID#1 is linked only to sub-configurations #0 and #1 among the four pre-configurations, and the code-points of the CSI request field linked to the kth CSI reporting configuration in which a total of four sub-configurations are set are '001', '110', and '111', and '001' is linked to two sub-configurations (e.g., sub-configurations #0 and #2) within the kth CSI reporting configuration, '110' is linked to one sub-configuration (e.g., sub-configuration #2) within the kth CSI reporting configuration, and '111' is linked to three sub-configurations (e.g., sub-configurations #0, #1, #2) within the kth CSI reporting configuration, then the corresponding N(k) value can be determined as 2. That is, even if four sub-configurations are set, it is preferable to count only the sub-configurations since the maximum number of sub-configurations (e.g., sub-configurations #0 and #1 linked to code-point '111' of the CSI request field) linked to the corresponding CSI-RS resource ID#1 (which can be triggered via DCI) is 2. The present embodiment can be applied to P-CSI-RS resources and / or SP-CSI-RS resources linked to AP-CSI reporting and / or SP-CSI reporting on PUSCH.

[0435] One of the above-mentioned embodiments #2-1-1, #2-1-2, and #2-1-3 may be selectively applied depending on the capabilities of the terminal.

[0436]

[0437] [Example #2-2] The counting rule for the number of ports of the proposed CSI-RS resource is as follows. If X CSI reporting configurations are linked to one CSI-RS resource, and {the number of sub-configurations(s) linked to the corresponding CSI-RS resource within each CSI reporting configuration} × {the number of ports set in the corresponding CSI-RS resource configuration} is expressed as N(k), then the counting of the number of ports of the CSI-RS resource can be defined as N(1)+N(2)+…+N(X). Here, N(1) means the product of {the number of sub-configurations(ies) associated with the corresponding CSI-RS resource in the first CSI-RS reporting configuration in which the corresponding CSI-RS resource is configured} and {the number of ports configured in the corresponding CSI-RS resource configuration}, and N(X) means the product of {the number of sub-configurations(ies) associated with the corresponding CSI-RS resource in the Xth CSI-RS reporting configuration in which the corresponding CSI-RS resource is configured} and {the number of ports configured in the corresponding CSI-RS resource configuration}. If there is no sub-configuration configured for the kth CSI-RS reporting configuration, the value of N(k) is determined as {the number of ports configured in the corresponding CSI-RS resource configuration}. Specifically, the N(k) value, i.e., the number of sub-configurations associated with a CSI-RS resource, may be determined based on one or a combination of the embodiments described below, based on the capability of the terminal, the CSI report type (e.g., P / SP / AP CSI report), or the CSI-RS resource type (e.g., P / SP / AP CSI-RS resource).

[0438] [Example #2-2-1] Even if multiple sub-configurations are set or activated for the kth CSI report configuration (e.g., CSI-ReportConfig), the value of N(k) is always considered as {the number of ports set in the corresponding CSI-RS resource configuration}.

[0439] [Example #2-2-1] When multiple (e.g. L) sub-configurations are configured for the kth CSI reporting configuration, the value of N(k) is always considered as the product of L and {the number of ports configured in the corresponding CSI-RS resource configuration}, regardless of how many of the L are actually activated / triggered.

[0440] [Example #2-2-3] Even if multiple (e.g. L) sub-configurations are set for the kth CSI reporting configuration, if N out of L are actually activated / triggered via MAC-CE or DCI, the value of N(k) is considered as the product of N and {the number of ports set in the corresponding CSI-RS resource configuration}.

[0441] [Embodiment #2-2-4] For Embodiments #2-2-2 and #2-2-3, if sub-configurations that differ only in power offset (e.g., power offset between CSI-RS and PDSCH) are set for the same CSI-RS resource, the sub-configurations can be regarded as a single sub-configuration. For example, for the CSI reporting configuration set as in FIG. 18b, if Embodiment #2-2-2 is applied, N(k)=4×16, but sub-configuration #1 and sub-configuration #2 differ only in power offset, and sub-configuration #3 and sub-configuration #4 also differ only in power offset, so N(k)=2×16 related to the sub-configurations can be counted. As another example, if only sub-configuration #1 and sub-configuration #2 are activated in FIG. 18b, N(k)=2×16 if Embodiment #2-2-3 is applied. However, if only sub-setting #1 and sub-setting #2 are activated in FIG. 18b, then according to the present embodiment, sub-setting #1 and sub-setting #2 differ only in power offset, and thus can be counted as N(k)=16.

[0442] [Embodiment #2-2-5] In applying Embodiment #2-2-2, Embodiment #2-2-3, Embodiment #2-2-4, and Embodiment #2-2-6, when port subset indication information, i.e., bitmap information for port on / off, is set for a specific sub-configuration, such as Type 1 spatial domain adaptation or Type 1 spatial domain + power domain adaptation, the number of ports set in the corresponding CSI-RS resource configuration may be replaced with the number of ports turned on by the corresponding bitmap information. For example, for the CSI reporting configuration set as in FIG. 18b, when Embodiment #2-2-2 is applied, N(k)=4×16, but since only 8 ports are turned on by setting bitmap information for sub-configuration #3 and sub-configuration #4, in this case, N(k)=2×16+2×8 may be counted. As another example, if only sub-setting #1 and sub-setting #3 are activated in the above-described Fig. 18b, N(k) = 2 × 16 if embodiment #2-2-3 is applied. However, since only 8 ports are turned on by bitmap information for sub-setting #3, in this case, N(k) = 16 + 8 can be counted.

[0443] [Example #2-2-6] For the k-th CSI reporting configuration, multiple (e.g., L) sub-configurations are configured, and in particular, for SP-CSI reporting on PUSCH or AP-CSI reporting, only some M of the L can be activated using DCI. For example, a CSI reporting configuration linked to each code point of a CSI request field of DCI, and if multiple sub-configurations are configured for the corresponding CSI reporting configuration, the sub-configuration(s) can be configured / indicated in advance. Accordingly, the terminal can feed back the CSI reporting configuration linked to the code point indicated by the DCI and the CSI corresponding to the sub-configuration(s) to the base station through an uplink channel (e.g., PUSCH). At this time, the N(k) value may be considered as the product of {the maximum number of sub-configuration(s)} and {the number of ports set in the corresponding CSI-RS resource configuration} among all code-points of the CSI request field linked to the kth CSI reporting configuration, or the N(k) value may be considered as the maximum of {the sum of the number of on ports set in the sub-configuration(s) linked to each code-point (e.g., the number of antenna ports signaled as '1' by the bitmap)} and {the number of ports set in the corresponding CSI-RS resource configuration}.

[0444] For example, a k-th CSI reporting configuration configured with 16-port CSI-RS resources and a total of 4 sub-configurations (e.g., all 16 antenna ports on in sub-configuration#0, only 8 antenna ports on in sub-configuration#1, only 4 antenna ports on in sub-configuration#2, and only 2 antenna ports on in sub-configuration#3, which is signaled via antenna port subset indication or bitmap) is associated with code-points '001', '110', and '111' in the CSI request field, and '001' is associated with 2 sub-configurations (e.g., sub-configuration#1 / #3) in the k-th CSI reporting configuration, '110' is associated with 1 sub-configuration (e.g., sub-configuration#0) in the k-th CSI reporting configuration, and '111' is associated with 3 sub-configurations (e.g., sub-configuration#1 / #2 / #3) in the k-th CSI reporting configuration. In the case of linking, the corresponding N(k) can be determined as 3×16. That is, even if 4 sub-configurations are set, the maximum number of sub-configurations that can be triggered via DCI is 3, so it is desirable to count only the CSI-RS resource ports corresponding to 3 sub-configurations.

[0445] Alternatively, if the N(k) value is considered as the maximum of {the sum of the number of on ports (e.g., the number of antenna ports signaled as '1' by the bitmap) set in the associated sub-configuration(s) for each code-point) among all code-points of the associated CSI request field} and {the number of ports set in the corresponding CSI-RS resource configuration}, then the N(k) value can be determined as 16=max{8+2, 16, 8+4+2}. Here, if the value determined by the max function is less than the number of ports set in the CSI-RS resource configuration, the final N(k) value can be determined as the number of ports set in the CSI-RS resource configuration.

[0446] In this example, it is assumed that all four sub-configurations are associated with the CSI-RS resource, specifically Type 1 spatial domain adaptation and / or power domain adaptation. The same method can be extended and applied to Type 2 spatial domain adaptation or Type 2 spatial domain + power domain adaptation. For example, if a 16-port CSI-RS resource ID#1 is associated only with sub-configuration #0 and sub-configuration #1 among 4 sub-configurations, and the k-th CSI reporting configuration in which 4 sub-configurations are configured and code-points '001', '110', and '111' of the CSI request field are associated, and '001' is associated with 2 sub-configurations (e.g., sub-configuration #0 / #2) within the k-th CSI reporting configuration, '110' is associated with 1 sub-configuration (e.g., sub-configuration #2) within the k-th CSI reporting configuration, and '111' is associated with 3 sub-configurations (e.g., sub-configuration #0 / #1 / #2) within the k-th CSI reporting configuration, then the corresponding N(k) value can be determined as 16×2=32. That is, even if four sub-configurations are configured, since the maximum number of sub-configurations(es) associated with the corresponding CSI-RS resource ID#1 that can be triggered via DCI is 2 (e.g., sub-configuration #0 / #1 where the code-point of the CSI request field is associated with '111'), it is preferable to count the product of the number of CSI-RS resource(s) corresponding to the two sub-configurations and the number of antenna ports. The present embodiment may be applied to P-CSI-RS resources and / or SP-CSI-RS resources associated with AP-CSI reporting and / or SP-CSI reporting on PUSCH.

[0447] One of the aforementioned embodiments #2-2-1, #2-1-2, and #2-2-3 may be selectively applied depending on the capabilities of the terminal.

[0448]

[0449] [Example #3] A method for determining a CSI-RS EPRE and an antenna port subset indication method when measuring / calculating CSI based on a subset of antenna ports that constitute a CSI-RS resource indicated by the portSubsetIndicator parameter set in the sub-setting.

[0450] A sub-configuration can be configured within the CSI reporting configuration. A subset of antenna ports constituting a CSI-RS resource can be signaled by the portSubsetIndicator parameter configured in the sub-configuration, and CSI measurement / calculation utilizing only the subset can be configured. In this regard, embodiment #3 relates to determining a CSI-RS EPRE and indicating an antenna port subset.

[0451] The CSI-ReportSubConfig IE defined in the TS 38.331 standard document is as follows [Table 3].

[0452]

[0453] The description of each field in [Table 3] is found in the TS 38.331 standard document and is as follows.

[0454] codebookSubConfig: Codebook parameters applicable to the ports indicated by portSubsetIndicator. The applicable value ranges for codebook subset restrictions, rank restrictions, N1, N2, Ng, and 2TX-CodebookSubsetRestriction follow the existing specifications according to the codebookConfig set within CSI-ReportConfig, and apply to the number of ports determined by portSubsetIndicator (see TS 38.214

[0019] , section 5.2.1.4.2). In this field, the network always sets the codebook type to type1. If reportQuantity is set to 'cri-RI-i1-CQI', the typeISinglePanel-codebookSubsetRestriction-i2 parameter must be set in codebookSubConfig for each subconfiguration containing portSubsetIndicator. For each CSI-RS resource in the connected CSI-ResourceConfig for channel measurements, a port indication for each class R indicating which R port among the P ports to use within the sub-configuration. P corresponds to the number of bits in the bitmap portSubsetIndicator-r18 whose value is 1.

[0455] nzp-CSI-RS-ResourceList: A list of NZP CSI RS resources for a sub-set, which is a (sub)set of the CSI-RS resource set for channel measurements associated with the sub-set in the CSI report configuration. A value of 0 indicates the first NZP CSI RS resource in the CSI-RS resource set, and a value of 1 indicates the second NZP CSI RS resource in the CSI-RS resource set.

[0456] portSubsetIndicator: Indicates a (sub)set of CSI-RS antenna ports used for CSI calculations of a sub-configuration. Each bit in the bit string corresponds to an antenna port. If the bit is set to 1, the corresponding port is enabled for CSI calculations corresponding to the sub-configuration. If the bit is set to 0, the corresponding port is not enabled for CSI calculations corresponding to the sub-configuration. The size of the bit string is equal to P bits, where P=2 / 4 / 8 / 12 / 16 / 24 / 32 represents the number of ports of the NZP CSI-RS resource associated with the CSI-ReportConfig in the resource set for channel measurements.

[0457] powerOffset: If powerControlOffset is set in the NZP CSI-RS resource indicated by nzp-CSI-RS-Resources, the power offset of the PDSCH RE and the NZP CSI-RS RE is equal to powerControlOffset-powerOffset.

[0458] reportSubConfigParams: Indicates the resources to use for a CSI report sub-configuration, including either a1-parameter containing antenna port subsets and associated parameters related to the sub-configuration, or a2-parameter containing a list of NZP CSI-RS resources for the sub-configuration. (See TS 38.214

[0019] , section 5.2.1.4.2)

[0459]

[0460] As above, the portSubsetIndicator parameter is included in the a1-parameters included in the sub-configuration. Using the portSubsetIndicator parameter, which antenna port among the total P antenna ports configured for NZP CSI-RS is turned on or off can be configured through bitmap information of P bit size. In the bitmap information, a bit with a value of '1' means on, and a bit with a value of '0' means off. The terminal can utilize the antenna ports in the on state to calculate CSI such as RI / PMI / CQI corresponding to the sub-configuration and report the CSI to the base station.

[0461]

[0462] At the RAN1#96bis meeting, the following conclusion was reached.

[0463] ----------------------------------------------------------------

[0464] Conclusion (RAN1#96bis)

[0465] The general understanding in RAN1 is as follows:

[0466] - powerControlOffset("Pc") ratio It is defined in dB.

[0467] - Here

[0468] P PDSCH is the energy of the total PDSCH ports multiplexed onto one subcarrier of one OFDM symbol.

[0469] P CSIRS is the energy of all CSI-RS ports multiplexed on one subcarrier of one OFDM symbol.

[0470] ----------------------------------------------------------------

[0471] As concluded in the above RAN1#96bis meeting, P CSIRS Alternatively, CSI-RS EPRE (energy per resource element) can be interpreted as the energy carried on all CSI-RS ports multiplexed on one sub-carrier within one OFDM symbol. For example, as shown in FIG. 19h, one CDM group can be formed by CDMing four CSI-RS ports on one RE. In this case, if two antenna ports are turned off for each CDM group by portSubsetIndicator, for example, if the portSubsetIndicator parameter is set to turn off antenna ports 3000, 3002, 3004, and 3006, P CSIRS Alternatively, the CSI-RS EPRE can be halved. In other words, if '1' values ​​are set in portSubsetIndicator for N (<=K) of the CDM groups consisting of K antenna ports, the "CSI-RS EPRE corresponding to the NZP CSI-RS to which the portSubsetIndicator parameter is applied" value can be N / K times the "CSI-RS EPRE set for the corresponding NZP CSI-RS" value. Here, according to the TS 38.214 standard document, the "CSI-RS EPRE set for the corresponding NZP CSI-RS" is determined by the offset value versus the power of the SSB as follows.

[0472] ----------------------------------------------------------------

[0473] The downlink CSI-RS EPRE can be derived from the SS / PBCH block downlink transmit power given by the parameter powerControlOffsetSS and the parameter ss-PBCH-BlockPower provided by the upper layer if the SS / PBCH block is associated with a serving cell PCI, or from ss-PBCH-BlockPower-r17 and powerControlOffsetSS of SSBMTC-AdditionalPCI-r17 provided by the upper layer if the SS / PBCH block is associated with an additional PCI different from the serving cell PCI. Here, the CSI-RS is QCLed with the SS / PBCH block. The downlink reference signal transmit power is defined as the linear average of the power contributions (in [W]) of the resource elements carrying the configured CSI-RS within the operating system bandwidth.

[0474] ----------------------------------------------------------------

[0475] However, when determining the EPRE of a CSI-RS to which the portSubsetIndicator parameter is applied in the aforementioned manner, there is a problem that the EPRE value varies for each CDM group when the number of antenna ports in the off state differs for each CDM group within the same symbol. Specifically, for an 8-port CSI-RS resource set as in FIG. 19h, four ports, including antenna ports 3000, 3005, 3006, and 3007, can be set to off by the portSubsetIndicator parameter. That is, since one antenna port out of four in CDM group 0 is off, and three antenna ports out of four in CDM group 1 are off, the EPRE for CDM group 0 becomes 1 / 4, and the EPRE for CDM group 1 becomes 3 / 4. However, the assumption that the EPREs of CDM group 0 and CDM group 1 included in one OFDM symbol are different may be inappropriate from the perspective of CQI derivation of the terminal.

[0476]

[0477] FIG. 23 illustrates an example of a procedure for providing configuration information for CSI reporting according to one embodiment of the present disclosure. FIG. 23 illustrates a method performed by a base station.

[0478] Referring to FIG. 23, in step S2301, the base station determines at least one CSI-RS resource and at least one CSI-RS port. That is, the base station may request CSI measurement and reporting from the terminal to acquire channel information of the terminal, and for this purpose, may determine at least one CSI-RS resource and at least one port for CSI-RS transmission. In this case, multiple ports may be associated with one CSI-RS resource.

[0479] In step S2303, the base station determines port subsets for sub-configurations. The base station may determine multiple port subsets using subsets of CSI-RS ports associated with a single CSI-RS resource. Spatial domain adaptation may be performed by generating the port subsets. At this time, according to various embodiments, the base station may determine the port subsets by considering CDM groups defined by the CDM relationships of the ports. Specifically, the base station may determine the port subsets such that the number of ports turned off or on in CDM groups located in the same time resource (e.g., OFDM symbol, slot, etc.) is the same. In other words, the port subsets may be determined such that the number of ports turned off or on is the same between CDM groups transmitted in a single OFDM symbol or between CDM groups transmitted within a single slot.

[0480] In step S2305, the base station transmits configuration information for CSI reporting. The configuration information may include information related to at least one CSI-RS resource and at least one CSI-RS port determined in step S2301, as well as information related to sub-configurations determined in step S2303. The information related to sub-configurations may include a bitmap indicating a port subset.

[0481] As described with reference to FIG. 23, the base station determines port subsets under constraints related to the CDM group. Subsequently, although not shown in FIG. 23, the base station may receive a CSI report including at least one CSI from the terminal.

[0482] Below, the present disclosure describes more specific embodiments for determining port subsets among the procedures illustrated in FIG. 23.

[0483]

[0484] [Example #3-1] To solve this problem, a constraint may be introduced that the number of antenna ports turned off or on by the portSubsetIndicator parameter for at least one CDM group on the same OFDM symbol is all the same. In other words, the terminal may not expect that the number of antenna ports turned off or on by the portSubsetIndicator parameter for at least one CDM group on the same OFDM symbol or within the same slot is set differently for each CDM group. For example, in FIG. 19h, if two antenna ports are turned off for CDM group 0 by the portSubsetIndicator parameter, two antenna ports may also have to be turned off for another CDM group 1, and the terminal may not expect signaling that one or three antenna ports for CDM group 1 are turned off.

[0485] Exceptionally, it may be allowed that all antenna ports belonging to a specific CDM group among at least one CDM group in the same OFDM symbol or within the same slot are turned off. This is because turning off all antenna ports within a CDM group does not cause confusion in the CSI-RS EPRE calculation of the UE. For example, in FIG. 19h, signaling (e.g., setting the portSubsetIndicator parameter) that two antenna ports for CDM group 0 are turned off and all antenna ports belonging to another CDM group 1 are turned off may be allowed by the portSubsetIndicator parameter.

[0486] [Embodiment #3-2] According to another embodiment, when portSubsetIndicator is set, if the value '1' is set in portSubsetIndicator for N (<=K) of K antenna ports set to NZP CSI-RS on one OFDM symbol or within the same slot, the value of "CSI-RS EPRE corresponding to NZP CSI-RS to which portSubsetIndicator parameter is applied" may be N / K times the "CSI-RS EPRE set to the corresponding NZP CSI-RS". For example, for an 8-port CSI-RS resource set as in FIG. 19h, if four ports, such as antenna ports 3000, 3005, 3006, and 3007, are set to be off by the portSubsetIndicator parameter, the value of "CSI-RS EPRE corresponding to the NZP CSI-RS to which the portSubsetIndicator parameter is applied" may be half the value of "CSI-RS EPRE set for the corresponding NZP CSI-RS."

[0487] [Embodiment #3-3] According to another embodiment, a constraint may be introduced that the number of antenna ports turned off or on for each symbol is the same by the portSubsetIndicator parameter. For example, as in FIG. 19p, for CSI-RS resources transmitted in symbols #3 / #4 / #10 / #11, if N ports are turned off or on in symbol #3, a constraint may be introduced that N ports are also turned off or on in the remaining symbols #4 / #10 / #11. In the case of this embodiment, there is an advantage in that the CSI-RS EPRE for each symbol can be adjusted to be the same by assuming that the number of CSI-RS ports transmitted for each symbol is the same.

[0488]

[0489] The "CSI-RS EPRE corresponding to NZP CSI-RS with portSubsetIndicator parameter applied" value described above can be applied to the CSI-RS EPRE in the excerpt from section 5.2.2.5.1 of the TS 38.214 standard document below. Based on this, the terminal can measure the CQI value and report it to the base station.

[0490] ----------------------------------------------------------------

[0491] For UEs configured with CSI-ReportConfig, which includes a list of sub-configurations provided by -[csi-ReportSubConfigList],

[0492] - If the sub-configuration indicates a CSI-RS antenna port subset using the upper layer bitmap parameter [port-subsetIndicator] as described in Section 5.2.1.4.2, then for CQI calculation, the antenna ports corresponding to all bits with value 1 in [port-subsetIndicator] are mapped to consecutive antenna ports starting from CSI-RS antenna port 3000 in increasing order of bit position in [port-subsetIndicator]. The UE shall map PDSCH signals from antenna ports in the set [1000,…, 1000+v-1] for v layers to antenna ports [3000,…, 3000+P-1]. T It should be assumed that the signal transmitted from the corresponding symbol is equivalent to the signal transmitted from the corresponding symbol, and is given as follows.

[0493]

[0494] Here, P corresponds to the number of bits in the bitmap [port-subsetIndicator] whose value is 1, and is as described previously in this section, and if the sub-setting does not indicate a power offset [powerOffset], the corresponding PDSCH EPRE and CSI-RS EPRE are as defined previously in this section.

[0495] ----------------------------------------------------------------

[0496] This embodiment can be applied when the power offset parameter is not set in the sub-setting and the portSubsetIndicator parameter is set.

[0497]

[0498] FIG. 24 illustrates an example of a procedure for transmitting a CSI report according to one embodiment of the present disclosure. FIG. 24 illustrates signal exchange between a terminal (2310) and a base station (2320).

[0499] Referring to FIG. 24, in step S2301, the base station (2320) configures a CSI reporting configuration for the terminal (2310). Here, the CSI reporting configuration is linked to a single CMR CSI-RS resource. In addition, the CSI reporting configuration is linked to multiple sub-configurations.

[0500] In step S2303, the terminal (2310) calculates CSI values ​​for the CSI reporting configuration. The CSI values ​​are determined based on a CSI reference resource. The CSI reference resource can be defined according to the proposed method.

[0501] In step S2305, the terminal (2310) transmits the calculated CSI for the CSI reporting configuration to the base station (2320). In this way, even if a single CSI-RS resource is configured for CMR, if multiple sub-configurations are configured, the time domain property of the CSI reference resource can be defined as in the case where multiple CSI-RS resources are configured, as proposed in [Example #1].

[0502]

[0503] To accommodate base stations turning antennas on / off or adjusting power values, multiple antenna port numbers or power offset values ​​can be linked for a single CSI reporting configuration. In this case, the proposed technology can be applied to defining CSI reference resources corresponding to the corresponding CSI report, counting CSI-RS resources / ports, etc., thereby supporting an efficient CSI calculation / reporting method that takes into account the implementation complexity of the terminal.

[0504]

[0505] The proposed methods described above can be implemented independently, but they can also be implemented as a combination (or merge) of some of the proposed methods. Rules can be defined so that the base station notifies the terminal of the applicability of the proposed methods (or information about the rules of the proposed methods) through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0506] The present disclosure may be embodied in other specific forms without departing from the technical ideas and essential features described herein. Therefore, the above detailed description should not be construed as limiting in all respects 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 equivalent scope of the present disclosure are intended to be included within the scope of the present disclosure. Furthermore, claims that are not explicitly cited in the claims may be combined to form an embodiment or incorporated into a new claim through a post-filing amendment.

[0507] Embodiments of the present disclosure can be applied to various wireless access systems. Examples of various wireless access systems include the 3rd Generation Partnership Project (3GPP) or 3GPP2 systems.

[0508] The embodiments of the present disclosure can be applied not only to the various wireless access systems described above, but also to all technical fields that utilize these various wireless access systems. Furthermore, the proposed method can also be applied to mmWave and THz communication systems utilizing ultra-high frequency bands.

[0509] Additionally, embodiments of the present disclosure can be applied to various applications such as autonomous vehicles and drones.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving configuration information for a CSI (channel state information) report including a list of multiple sub-configurations; and A step of transmitting CSI including a measurement result based on at least one CSI-RS (reference signal) related to the above CSI report to a base station, The above configuration information includes information related to CSI-RS resources and multiple CSI-RS ports for the CSI reporting, The above plurality of sub-settings are linked to information related to different port-subsets based on the plurality of CSI-RS ports, A method in which the above port subsets are determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

2. In claim 1, A method in which each of the above port subsets is determined such that the number of ports turned off or on in CDM groups located on the same time axis is the same.

3. In claim 2, The above terminal does not expect the number of antenna ports turned on or off for at least one CDM group to be set differently for each CDM group on the same OFDM (orthogonal frequency division multiplexing) symbol or the same slot.

4. In claim 2, The above CDM groups include a first CDM group and a second CDM group located on the same time axis, A method in which all ports included in the first CDM group are turned off, regardless of the number of ports included in the second CDM group that are turned off or on.

5. In claim 1, A method in which a CSI-RS EPRE for a port subset including at least one port that is turned off among the above port subsets is determined as a value that reduces the CSI-EPRE set for the CSI-RS related to the CSI-RS resource by the ratio of the ports that are turned off.

6. In claim 1, A method in which each of the above port subsets is determined such that the number of ports that are turned off or on in at least one CDM group located in the first symbol and the number of ports that are turned off or on in at least one CDM group located in the second symbol are equal.

7. In a method performed by a base station in a wireless communication system, A step of determining CSI (channel state information)-RS (reference signal) resources and multiple CSI-RS ports for a terminal; A step of determining sub-settings for the terminal from the plurality of CSI-RS ports using port subsets; A step of transmitting configuration information for CSI reporting, including information related to the above port subsets, A method in which the above port subsets are determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

8. In claim 7, A method in which each of the above port subsets is determined such that the number of ports turned off or on in CDM groups located on the same time axis is the same.

9. In claim 8, The above CDM groups include a first CDM group and a second CDM group located on the same time axis, A method in which all ports included in the first CDM group are turned off, regardless of the number of ports included in the second CDM group that are turned off or on.

10. In claim 7, A method in which a CSI-RS EPRE for a port subset including at least one port that is turned off among the above port subsets is determined as a value that reduces the CSI-EPRE set for the CSI-RS related to the CSI-RS resource by the ratio of the ports that are turned off.

11. In claim 7, A method in which each of the above port subsets is determined such that the number of ports that are turned off or on in at least one CDM group located in the first symbol and the number of ports that are turned off or on in at least one CDM group located in the second symbol are equal.

12. In a wireless communication system, at a terminal, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Receive configuration information for a CSI (channel state information) report containing a list of multiple sub-configurations, It is configured to transmit to the base station CSI including a measurement result based on at least one CSI-RS related to the above CSI report, The above configuration information includes information related to CSI (channel state information)-RS (reference signal) resources for the CSI report and multiple CSI-RS ports, The above plurality of sub-settings are linked to information related to different port-subsets based on the plurality of CSI-RS ports, A method in which the above port subsets are determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

13. In a wireless communication system, at a base station, Transmitter and receiver; and A processor connected to the above transmitter and receiver is included, The above processor, Determine CSI (channel state information)-RS (reference signal) resources and multiple CSI-RS ports for the terminal, Determine sub-settings for the terminal from the plurality of CSI-RS ports using port subsets, It is configured to transmit configuration information for CSI reporting, including information related to the above port subsets, The above port subsets are determined based on the CDM (code division multiplexing) group of the CSI-RS ports.

14. In communication devices, At least one processor; At least one computer memory connected to said at least one processor and storing instructions that direct operations when executed by said at least one processor, The above actions are, A step of receiving configuration information for a CSI (channel state information) report including a list of multiple sub-configurations; and A step of transmitting CSI including a measurement result based on at least one CSI-RS related to the above CSI report to a base station, The above configuration information includes information related to CSI (channel state information)-RS (reference signal) resources for the CSI report and multiple CSI-RS ports, The above plurality of sub-settings are linked to information related to different port-subsets based on the plurality of CSI-RS ports, A communication device in which the above port subsets are determined based on a CDM (code division multiplexing) group of the CSI-RS ports.

15. In a non-transitory computer-readable medium storing at least one instruction, comprising at least one instruction executable by the processor, At least one of the above commands causes the device to: Receive configuration information for a CSI (channel state information) report containing a list of multiple sub-configurations, Instructs the base station to transmit CSI including measurement results based on at least one CSI-RS related to the above CSI report, The above configuration information includes information related to CSI (channel state information)-RS (reference signal) resources for the CSI report and multiple CSI-RS ports, The above plurality of sub-settings are linked to information related to different port-subsets based on the plurality of CSI-RS ports, A computer-readable medium wherein the above port subsets are determined based on a code division multiplexing (CDM) group of the CSI-RS ports.

Images