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 the method performed by a terminal may comprise the steps of: receiving configuration information regarding a CSI report, including a list of a plurality of sub-configurations; and transmitting, to a base station, at least one piece of CSI including a measurement result based on at least one CSI-RS associated with 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] Wireless access systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless access systems are multiple access systems that support communications with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include 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).

[0003] In particular, as numerous communication devices demand greater communication capacity, enhanced mobile broadband (eMBB) communication technologies are being proposed, improving upon existing radio access technology (RAT). Furthermore, massive machine type communications (mMTC), which connects multiple devices and objects to provide diverse services anytime and anywhere, as well as communication systems that consider reliability and latency-sensitive services / user equipment (UE), are being proposed. Various technological configurations are being proposed for these solutions.

[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 reducing overhead of CSI reporting based on sub-settings in a wireless communication system.

[0006] The present disclosure relates to a device and method for distributing CSIs corresponding to sub-settings in a wireless communication system.

[0007] The present disclosure relates to an apparatus and method for setting occasions for transmitting CSIs corresponding to sub-settings in a wireless communication system.

[0008] The present disclosure relates to an apparatus and method for signaling information related to occasions for transmitting CSIs corresponding to sub-configurations in a wireless communication system.

[0009] The present disclosure relates to an apparatus and method for signaling information related to opportunities to transmit CSIs corresponding to sub-configurations in a wireless communication system.

[0010] The present disclosure relates to an apparatus and method for generating a CSI sub-report transmitted in multiple opportunities in a wireless communication system.

[0011] The present disclosure relates to a device and method for generating a plurality of CSI sub-reports based on CSIs corresponding to sub-settings in a wireless communication system.

[0012] The present disclosure relates to a device and method for generating a single CSI sub-report by combining CSIs corresponding to sub-settings in a wireless communication system.

[0013] The present disclosure relates to a device and method for transmitting CSIs corresponding to sub-settings in a wireless communication system in a plurality of opportunities according to priority.

[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 to a base station at least one CSI including a measurement result based on at least one CSI-RS related to the CSI report. The sub-configurations are distinguished by at least one of an associated power offset or a number of antenna ports, and a first CSI sub-report determined based on the at least one CSI may be transmitted at a first opportunity among the occasions determined based on the configuration information, and a second CSI sub-report determined based on the at least one CSI may be transmitted at a second opportunity among the occasions.

[0016] As an example of the present disclosure, in a wireless communication system, a terminal 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 at least one CSI including a measurement result based on at least one CSI-RS related to the CSI report, wherein the sub-configurations are distinguished by at least one of an associated power offset or a number of antenna ports, and a first CSI sub-report determined based on the at least one CSI is transmitted at a first opportunity among the occasions determined based on the configuration information, and a second CSI sub-report determined based on the at least one CSI is transmitted at a second opportunity among the occasions.

[0017] 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, the operations being 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 at least one CSI including a measurement result based on at least one CSI-RS related to the CSI report, the sub-configurations being distinguished by at least one of an associated power offset or a number of antenna ports, and wherein a first CSI sub-report determined based on the at least one CSI is transmitted at a first of the occasions determined based on the configuration information, and a second CSI sub-report determined based on the at least one CSI is transmitted at a second of the occasions.

[0018] 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, the at least one instruction directing a device to: receive configuration information for a channel state information (CSI) report comprising a list of a plurality of sub-configurations; and transmit to a base station at least one CSI including a measurement result based on at least one CSI-RS related to the CSI report, the sub-configurations being distinguished by at least one of an associated power offset or a number of antenna ports, wherein a first CSI sub-report determined based on the at least one CSI is transmitted at a first of the occasions determined based on the configuration information, and a second CSI sub-report determined based on the at least one CSI is transmitted at a second of the occasions.

[0019] 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.

[0020] The following effects may be achieved by embodiments based on the present disclosure.

[0021] According to the present disclosure, the overhead of CSI (channel state information) reporting can be controlled.

[0022] 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.

[0023] Figure 1 illustrates an example of the structure of a wireless communication system applicable to the present disclosure.

[0024] FIG. 2 illustrates an example of a wireless device applicable to the present disclosure.

[0025] FIG. 3 illustrates an example of a frame structure in a wireless communication system applicable to the present disclosure.

[0026] FIG. 4 illustrates an example of a resource grid in a wireless communication system applicable to the present disclosure.

[0027] FIG. 5 illustrates an example of a physical resource block in a wireless communication system applicable to the present disclosure.

[0028] FIG. 6 illustrates an example of a slot structure in a wireless communication system applicable to the present disclosure.

[0029] FIG. 7 illustrates physical channels used in a wireless communication system applicable to the present disclosure and a general signal transmission and reception method using the same.

[0030] FIG. 8 illustrates an example of mapping physical channels within a slot in a wireless communication system applicable to the present disclosure.

[0031] Figure 9 illustrates examples of beams that can be applied to the present disclosure.

[0032] FIG. 10 illustrates an example of a DL BM (downlink beam management) procedure using a synchronization signal block (SSB) applicable to the present disclosure.

[0033] FIG. 11 illustrates an example of a DL BM procedure using CSI (channel state information)-RS (reference signal) that can be applied to the present disclosure.

[0034] FIG. 12 illustrates an example of a terminal reception beam determination procedure applicable to the present disclosure.

[0035] FIG. 13 illustrates an example of a transmission beam determination procedure of a base station applicable to the present disclosure.

[0036] Figure 14 illustrates an example of resource allocation in the time and frequency domains that can be applied to the present disclosure.

[0037] FIG. 15 illustrates an example of beam sweeping for UL BM (uplink beam management) using SRS (sounding reference signal) applicable to the present disclosure.

[0038] FIG. 16 illustrates an example of a UL BM procedure using SRS that can be applied to the present disclosure.

[0039] Figure 17 illustrates an example of an operation procedure of a base station supporting network energy saving (NES) technology applicable to the present disclosure.

[0040] Figure 18 illustrates an example of a procedure for CSI measurement and reporting that may be applied to the present disclosure.

[0041] FIGS. 19A to 19C illustrate examples of states of antenna elements according to one embodiment of the present disclosure.

[0042] FIG. 20 illustrates an example of a procedure for reporting CSIs for sub-sets in multiple occasions according to one embodiment of the present disclosure.

[0043] FIG. 21 illustrates an example of a procedure for reporting CSIs for sub-sets in multiple opportunities with different resource sizes according to one embodiment of the present disclosure.

[0044] FIG. 22 illustrates an example of a procedure for transmitting a CSI report based on sub-settings according to one embodiment of the present disclosure.

[0045] The following embodiments combine the components and features of the present disclosure in a predetermined form. Each component or feature may be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, some components and / or features may be combined to form embodiments of the present disclosure. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

[0046] In the description of the drawings, procedures or steps that may obscure the gist of the present disclosure are not described, and procedures or steps that can be understood by a person skilled in the art are also not described.

[0047] Throughout the specification, when a part is said to "comprising" or "including" a component, this does not mean that other components may be included, but rather that other components may be excluded, unless otherwise specifically stated. In addition, terms such as "...part," "...unit," and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software. In addition, the words "a" or "an," "one," "the," and similar related words may be used in the context of describing the present disclosure (especially in the context of the claims below) to include both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context.

[0048] Embodiments of the present disclosure described herein focus on the data transmission and reception relationship between a base station and a mobile station. Here, the base station is understood as a terminal node of a network that directly communicates with the mobile station. Certain operations described herein as being performed by the base station may, in some cases, be performed by an upper node of the base station.

[0049] That is, in a network consisting of multiple network nodes including a base station, various operations performed for communication with a mobile station may be performed by the base station or other network nodes other than the base station. In this case, the term 'base station' may be replaced by terms such as fixed station, Node B, eNB (eNode B), gNB (gNode B), ng-eNB, advanced base station (ABS), or access point.

[0050] Additionally, in the embodiments of the present disclosure, the term terminal may be replaced with terms such as user equipment (UE), mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, or advanced mobile station (AMS).

[0051] Additionally, a transmitter refers to a fixed and / or mobile node that provides data or voice services, and a receiver refers to a fixed and / or mobile node that receives data or voice services. Therefore, for uplink, a mobile station can be the transmitter, and a base station can be the receiver. Similarly, for downlink, a mobile station can be the receiver, and a base station can be the transmitter.

[0052] Embodiments of the present disclosure may be supported by standard documents disclosed in at least one of wireless access systems, such as IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP Long Term Evolution (LTE) system, 3GPP 5th generation (5G) NR (New Radio) system and 3GPP2 system, and in particular, embodiments of the present disclosure may be supported by 3GPP TS (technical specification) 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331 documents.

[0053] Furthermore, the embodiments of the present disclosure can be applied to other wireless access systems and are not limited to the systems described above. For example, they can be applied to systems implemented after the 3GPP 5G NR system and are not limited to a specific system.

[0054] That is, obvious steps or parts not described in the embodiments of the present disclosure can be explained by referring to the above documents. In addition, all terms disclosed in this document can be explained by the above standard documents.

[0055] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the present disclosure and is not intended to represent the only embodiments in which the technical configurations of the present disclosure may be implemented.

[0056] Additionally, specific terms used in the embodiments of the present disclosure are provided to aid in understanding of the present disclosure, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present disclosure.

[0057] The following technology can be applied to various wireless access systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access).

[0058] For clarity, the following description is based on 3GPP communication systems (e.g., LTE, NR, etc.), but the technical spirit of the present disclosure is not limited thereto. LTE may refer to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 may be referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 may be referred to as LTE-A pro. 3GPP NR may refer to technology after TS 38.xxx Release 15. 3GPP 6G may refer to technology after TS Release 17 and / or Release 18. "xxx" refers to a standard document detail number. LTE / NR / 6G may be collectively referred to as a 3GPP system.

[0059] 3GPP 6G can refer to technologies following 3GPP NR based on the 3GPP system. 3GPP 6G may not be limited to a specific Release or TS document, and its name may also differ from 3GPP 6G. In other words, 3GPP 6G can refer to technologies introduced after 3GPP NR and is not limited to a specific form.

[0060] The following description focuses on the 3GPP NR system, but is not limited thereto and may also be applied to 3GPP 6G. Furthermore, the matters described below may be modified and used in consideration of the 3GPP 6G system and are not limited to a specific form. However, the following description focuses on the 3GPP NR system for convenience of explanation. For background technology, terminology, abbreviations, etc. used in this disclosure, reference may be made to matters described in standard documents published prior to this disclosure. For example, reference may be made to the 36.xxx and 38.xxx standard documents.

[0061] System General

[0062] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing radio access technologies (RATs) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects numerous devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs that consider enhanced mobile broadband communication (eMBB), massive MTC (mMTC), and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed. For convenience, these technologies are referred to as NR in this disclosure. NR is an expression representing an example of 5G RAT.

[0063] A new RAT system, including NR, uses OFDM or a similar transmission scheme. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the existing LTE / LTE-A numerology but support a larger system bandwidth (e.g., 100 MHz). Alternatively, a single cell may support multiple numerologies. That is, terminals operating under different numerologies can coexist within a single cell.

[0064] A numerology corresponds to a single subcarrier spacing in the frequency domain. Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.

[0065] In addition, new RAT systems including 6G as the next-generation RAT can be considered. The new RAT system including 6G can consider, but is not limited to, i) very high data rates per device, ii) a very large number of connected devices, iii) global connectivity, iv) very low latency, v) reduced energy consumption of battery-free IoT devices, vi) ultra-reliable connections, and vii) connected intelligence with machine learning capabilities. The new RAT system including 6G can consider using the THz (Terahertz) frequency band at a higher frequency than the NR system for wider bandwidth and higher transmission rates, taking into account the above-mentioned aspects. The new RAT system including 6G can overcome existing limitations by applying AI / ML (artificial intelligence / machine learning), but may not be limited to the following.

[0066]

[0067] FIG. 1 illustrates the structure of a wireless communication system applicable to the present disclosure. Referring to FIG. 1, the NG-RAN is composed of gNBs that provide NG-RA (NG-Radio Access) user plane (i.e., new AS (access stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and control plane (RRC) protocol termination for UE. The gNBs are interconnected via Xn interfaces. The gNBs are also connected to the NGC (New Generation Core) via the NG interface. More specifically, the gNBs are connected to the AMF (Access and Mobility Management Function) via the N2 interface and to the UPF (User Plane Function) via the N3 interface. FIG. 1 may be a structure based on an NR system, and in a 6G system, the structure of FIG. 1 may be used in the same manner or with some modifications, and is not limited to a specific form.

[0068] FIG. 2 illustrates an example of a wireless device applicable to the present disclosure.

[0069] Referring to FIG. 2, 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).

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] The components of the wireless device described with reference to FIG. 2 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).

[0076] The structure of the wireless device described with reference to FIG. 2 can be understood as the structure of at least a portion of various devices. For example, it can be at least a portion of various devices (e.g., robots, vehicles, XR devices, portable devices, home appliances, IoT devices, AI devices / servers, etc.). Furthermore, according to various embodiments, the device may further include other components in addition to the components illustrated in FIG. 2.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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. The structure of the wireless device illustrated in Fig. 2 can be understood as a part of a RAN node (e.g., a base station, DU, RU, RRH, etc.). That is, the device illustrated in Fig. 2 may be a RAN node. In this case, the device may further include a wired transceiver for front haul and / or back haul communication. However, if the front haul and / or backhaul communication is based on wireless communication, at least one transceiver (206) illustrated in FIG. 2 may be used for the front haul and / or backhaul communication, and a wired transceiver may not be included.

[0082] FIG. 3 illustrates a frame structure in a wireless communication system applicable to the present disclosure.

[0083] NR systems can support multiple numerologies. Numerologies can be defined by subcarrier spacing and cyclic prefix (CP) overhead. Multiple subcarrier spacings can be derived by scaling the base (reference) subcarrier spacing by an integer N (or μ). Furthermore, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the numerology used can be selected independently of the frequency band. Furthermore, NR systems can support various frame structures corresponding to multiple numerologies.

[0084] Below, we examine OFDM numerologies and frame structures that can be considered in NR systems. The various OFDM numerologies supported in NR systems can be defined as shown in Table 1 below.

[0085] CP015 Normal 130 Normal 260 Normal, Extended 3120 Normal 4240 Normal

[0086] NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands. When the SCS is 30 kHz / 60 kHz, it supports dense urban areas, lower latency, and wider carrier bandwidth. When the SCS is 60 kHz or higher, it supports a bandwidth larger than 24.25 GHz to overcome phase noise. The NR frequency band is defined by two types of frequency ranges (FR1, FR2). FR1 and FR2 can be configured as shown in [Table 2] below. In addition, FR2 can mean millimeter wave (mmW).

[0087] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing FR1410MHz - 7125MHz 15, 30, 60kHz FR224250MHz - 52600MHz 60, 120, 240kHz

[0088] With regard to the frame structure in the NR system, the sizes of the various fields in the time domain are is expressed as a multiple of the time unit. Here, =480·10 3 Hz, =4096. Downlink and uplink transmissions are = It is organized into radio frames with a duration of 10ms. Here, each radio frame is = It consists of 10 subframes with a duration of 1ms. In this case, there may be one set of frames for uplink and one set of frames for downlink. In addition, transmission in uplink frame number i from a terminal may be earlier than the start of the corresponding downlink frame from the terminal. It must start before. For the subcarrier spacing configuration μ, slots are arranged within a subframe. ∈ are numbered in increasing order within a wireless frame. ∈ are numbered in increasing order. One slot is It consists of consecutive OFDM symbols, is determined by CP. Slot in subframe The start of an OFDM symbol in the same subframe are aligned temporally with the start of the OFDM signal. Not all terminals can transmit and receive simultaneously, which means that not all OFDM symbols in a downlink slot or uplink slot can be utilized.

[0089] [Table 3] shows the number of OFDM symbols per slot in a general CP ( ), number of slots per wireless frame ( ), number of slots per subframe ( ), and [Table 4] shows the number of OFDM symbols per slot in the extended CP, the number of slots per radio frame, and the number of slots per subframe.

[0090] 01410111420221440431480841416016

[0091] 212404

[0092] FIG. 3 is an example when μ=2 (SCS is 60 kHz). Referring to [Table 3], 1 subframe can include 4 slots. 1 subframe={1,2,4} slots illustrated in FIG. 3 is an example, and the number of slots that can be included in 1 subframe is defined as in [Table 3] or [Table 4]. In addition, a mini-slot can include 2, 4, or 7 symbols, or more or fewer symbols. With respect to physical resources in an NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. can be considered. Hereinafter, the physical resources that can be considered in an NR system will be described in detail.

[0093] First, with respect to antenna ports, antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be in a QC / QCL (quasi co-located or quasi co-location) relationship if the large-scale properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on another antenna port is carried. Here, the large-scale properties include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0094] In the 6G system, communication can be performed at the terahertz frequency described above, which is higher than the millimeter wave (mmW), and a frame structure of the same form as in FIG. 3 can be used, or a separate frame structure for the 6G system can be used, and is not limited to a specific form.

[0095] FIG. 4 illustrates a resource grid in a wireless communication system applicable to the present disclosure.

[0096] Referring to Figure 4, the resource grid is in the frequency domain. It consists of subcarriers, and one subframe is 14·2 μ It is described as an example, but not limited to, that it consists of OFDM symbols. In an NR system, the transmitted signal is One or more resource grids consisting of subcarriers and is described by OFDM symbols. Here, ≤ is. above represents the maximum transmission bandwidth, which may vary between uplink and downlink as well as between numerologies. In this case, one resource grid may be configured for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is referred to as a resource element and is uniquely identified by an index pair (k,l'). Here, k=0,..., is the index in the frequency domain, and l'=0,..., -1 indicates the position of the symbol within the subframe. When referring to a resource element in a slot, an index pair (k,l) is used. Here, l=0,..., is a complex value. The resource elements (k,l') for μ and antenna port p are . If there is no risk of confusion or if a particular antenna port or numerology is not specified, the indices p and μ can be dropped, resulting in a complex value or This can be. Also, a resource block (RB) is a frequency domain =12 is defined as consecutive subcarriers.

[0097] Point A serves as a common reference point of the resource block grid and is obtained as follows.

[0098] - offsetToPointA for the primary cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping the SSB used by the terminal for initial cell selection. It is expressed in resource block units assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2.

[0099] - absoluteFrequencyPointA represents the frequency-position of point A expressed as ARFCN (absolute radio-frequency channel number).

[0100] Common resource blocks (CRBs) are numbered from 0 upwards in the frequency domain for a subcarrier spacing setting μ. The center of subcarrier 0 of CRB 0 for a subcarrier spacing setting μ coincides with 'point A'. CRB numbers in the frequency domain The relationship between the resource element (k,l) and the subcarrier spacing setting μ is given as shown in [Mathematical Formula 1] below.

[0101]

[0102] In [Mathematical Equation 1], k is defined relative to point A such that k = 0 corresponds to a subcarrier centered at point A. Physical resource blocks are numbered from 0 within the bandwidth part (BWP). are numbered up to , where i is the number of the BWP. The physical resource block in BWP i and common resource blocks The relationship between them is given by [Mathematical Formula 2] below.

[0103]

[0104] is a common resource block where BWP starts relative to common resource block 0.

[0105] FIG. 5 illustrates a physical resource block in a wireless communication system applicable to the present disclosure. FIG. 6 illustrates a slot structure in a wireless communication system applicable to the present disclosure.

[0106] Referring to FIGS. 5 and 6, a slot includes multiple symbols in the time domain. For example, in the case of a normal CP, one slot includes seven symbols, but in the case of an extended CP, one slot includes six symbols.

[0107] A carrier comprises multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A BWP (Bandwidth Part) is defined as multiple consecutive (physical) resource blocks in the frequency domain, and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can comprise up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0108] The NR system can support up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC always operates with the radio frequency (RF) chip for the entire CC turned on, the terminal battery consumption may increase. Alternatively, when considering multiple use cases operating within a single wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different numerologies (e.g., subcarrier spacing, etc.) may be supported for each frequency band within the CC. Alternatively, each terminal may have different maximum bandwidth capabilities. Considering this, the base station can instruct the terminal to operate only on a portion of the bandwidth rather than the entire bandwidth of the wideband CC, and this portion of bandwidth is conveniently defined as the bandwidth part (BWP). A BWP can be composed of consecutive RBs on the frequency axis and can correspond to a single numerology (e.g., subcarrier spacing, CP length, slot / mini-slot interval).

[0109] Meanwhile, the base station can configure multiple BWPs even within a single CC configured for a terminal. For example, in the PDCCH monitoring slot, a BWP occupying a relatively small frequency range can be configured, and the PDSCH indicated by the PDCCH can be scheduled on a larger BWP. Alternatively, if UEs are concentrated in a specific BWP, some terminals can be configured to a different BWP for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between neighboring cells, a portion of the spectrum in the middle of the entire bandwidth can be excluded and both BWPs can be configured within the same slot. In other words, the base station can configure at least one DL / UL BWP for a terminal associated with a wideband CC. The base station can activate at least one DL / UL BWP(s) among the configured DL / UL BWP(s) at a specific time (via L1 signaling, MAC CE (Control Element), RRC signaling, etc.). Additionally, the base station can instruct switching to another configured DL / UL BWP (e.g., via L1 signaling or MAC CE or RRC signaling). Alternatively, switching to a configured DL / UL BWP can be performed based on a timer when the timer value expires. In this case, the activated DL / UL BWP is defined as the active DL / UL BWP. However, in situations such as when the terminal is performing the initial access process or before the RRC connection is set up, the configuration for the DL / UL BWP may not be received. Therefore, in these situations, the DL / UL BWP assumed by the terminal is defined as the initially active DL / UL BWP.

[0110] FIG. 7 illustrates physical channels used in a wireless communication system applicable to the present disclosure and a general signal transmission and reception method using the same.

[0111] In wireless communication systems, terminals receive information from a base station via the downlink and transmit it to the base station via the uplink. The information transmitted and received between the base station and terminals includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

[0112] When a terminal is powered on or enters a new cell, it performs an initial cell search operation, such as synchronizing with the base station (S701). To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as a cell identifier (ID). Afterwards, the terminal can receive a physical broadcast channel (PBCH) from the base station to obtain broadcast information within the cell. Meanwhile, the terminal can receive a downlink reference signal (DL RS) during the initial cell search phase to check the downlink channel status.

[0113] A terminal that has completed initial cell search can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried on the PDCCH (S702).

[0114] Meanwhile, when accessing a base station for the first time or when there are no radio resources for signal transmission, the terminal may perform a random access procedure (RACH) for the base station (steps S703 to S706). To this end, the terminal may transmit a specific sequence as a preamble via the Physical Random Access Channel (PRACH) (steps S703 and S705) and receive a response message to the preamble via the Physical Data Channel Control Channel (PDCCH) and the corresponding PDSCH (steps S704 and S706). In the case of a contention-based RACH, a contention resolution procedure (Contention Resolution Procedure) may additionally be performed.

[0115] The terminal that has performed the procedure described above can then perform PDCCH / PDSCH reception (S707) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S708) as general uplink / downlink signal transmission procedures. In particular, the terminal receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and its format varies depending on the purpose of use.

[0116] Meanwhile, the control information that the terminal transmits to the base station via the uplink or that the terminal receives from the base station includes downlink / uplink ACK / NACK (Acknowledgement / Non-Acknowledgement) signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), etc. In the case of the 3GPP LTE system, the terminal can transmit the above-described control information such as CQI / PMI / RI via PUSCH and / or PUCCH.

[0117] FIG. 8 illustrates an example of mapping physical channels within a slot in a wireless communication system applicable to the present disclosure.

[0118] Referring to FIG. 8, a single slot may include a DL control channel, DL or UL data, and a UL control channel. For example, the first N symbols in a slot may be used to transmit a DL control channel (hereinafter, DL control region), and the last M symbols in the slot may be used to transmit a UL control channel (hereinafter, UL control region). N and M are each integers greater than or equal to 0. A resource region (hereinafter, data region) between the DL control region and the UL control region may be used for DL ​​data transmission or UL data transmission. A time gap for DL-to-UL or UL-to-DL switching may exist between the control region and the data region. A PDCCH may be transmitted in the DL control region, and a PDSCH may be transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot may be used as a time gap.

[0119] Downlink (DL) physical channel / signal

[0120] (1) PDSCH

[0121] The PDSCH carries downlink data (e.g., a DL-shared channel transport block, DL-SCH TB). The TB is encoded into a codeword (CW) and then transmitted after undergoing scrambling and modulation processes. A CW includes one or more code blocks (CBs). One or more CBs can be grouped into a single CB group (CBBG). Depending on the cell configuration, a PDSCH can carry up to two CWs. Scrambling and modulation are performed for each CW, and the modulation symbols generated from each CW are mapped to one or more layers. Each layer undergoes precoding, is mapped to resources along with the DMRS, and is transmitted through the corresponding antenna port. PDSCH can be dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PDSCH transmission is accompanied by PDCCH, whereas in CS, PDSCH transmission is not accompanied by PDCCH. CS includes semi-persistent scheduling (SPS).

[0122] (2) PDCCH

[0123] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the DL-SCH, frequency / time resource allocation information for the UL-SCH (shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, frequency / time resource allocation information for upper-layer control messages such as the Random Access Response (RAR) transmitted on the PDSCH, transmission power control commands, and information regarding the activation / release of Configured Scheduling (SPS / CS). Various DCI formats are provided depending on the information contained within the DCI.

[0124] [Table 5] shows examples of DCI formats transmitted via PDCCH.

[0125] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of one or multiple PUSCH in one cell, or indicating downlink feedback information for configured grant PUSCH (CG-DFI)1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell, and / or triggering one shot HARQ-ACK codebook feedback2_0Notifying a group of UEs of the slot format, available RB sets, COT duration and search space set group switching2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0126] DCI format 0_0 is used to schedule a TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule a TB-based (or TB-level) PUSCH or a CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule a TB-based (or TB-level) PDSCH or a CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 can be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 can be referred to as DL grant DCI or UL scheduling information. DCI format 2_0 is used to convey dynamic slot format information (e.g., dynamic SFI) to terminals, and DCI format 2_1 is used to convey downlink pre-emption information to terminals. DCI format 2_0 and / or DCI format 2_1 can be conveyed to terminals within a group through a group common PDCCH, which is a PDCCH conveyed to terminals defined as a group.

[0127] The PDCCH / DCI includes a cyclic redundancy check (CRC), which is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or intended use of the PDCCH. For example, if the PDCCH is for a specific UE, the CRC is masked with the Cell-RNTI (C-RNTI). If the PDCCH is for paging, the CRC is masked with the Paging-RNTI (P-RNTI). If the PDCCH is for system information (e.g., System Information Block, SIB), the CRC is masked with the System Information-RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the Random Access-RNTI (RA-RNTI).

[0128] [Table 6] illustrates the purpose and transmission channel of the PDCCH according to the RNTI. The transmission channel represents the transmission channel related to the data carried by the PDSCH / PUSCH scheduled by the PDCCH.

[0129] RNTIUsageTransport ChannelP-RNTIPaging and System Information change notificationPCH(Paging Channel)SI-RNTIBroadcast of System InformationDL-SCHRA-RNTIRandom Access ResponseDL-SCHTemporary C-RNTIContention Resolution (when no valid C-RNTI is available)DL-SCHTemporary C-RNTIMsg3 transmissionUL-SCHC-RNTI, MCS(Modulation and Coding Scheme)-C-RNTIDynamically scheduled unicast transmissionUL-SCHC-RNTIDynamically scheduled unicast transmissionDL-SCHMCS-C-RNTIDynamically scheduled unicast transmissionDL-SCHC-RNTITriggering of PDCCH ordered random accessN / ACS(Configued Scheduling)-RNTIConfigured scheduled unicast transmission (activation, reactivation and retransmission)DL-SCH,UL-SCCHCS-RNTIConfigured scheduled unicast transmission(deactivation)N / ATPC(Transmit Power Control)-PUCCH-RNTIPUCH power controlN / ATPC-PUSCH-RNTISRS power controlN / ATPC-SRS-RNTISRS trigger and power controlN / AINT(Interruption)-RNTIIndication pre-emption in DLN / ASFI(Slot Format Indication)-RNTISlot Format Indication on the given cellN / ASP(Semi-persistent)-CSI(Channel State Information)-RNTIActivation of Semi-persistent CSI reporting on PUSCHN / A,

[0130] The modulation scheme of the PDCCH is fixed (e.g., Quadrature Phase Shift Keying, QPSK), and one PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs) depending on the Aggregation Level (AL). One CCE consists of six Resource Element Groups (REGs). One REG is defined as one OFDMA symbol and one (P)RB.

[0131] PDCCH is transmitted via CORESET (Control Resource Set). CORESET corresponds to a set of physical resources / parameters used to carry PDCCH / DCI within BWP. For example, CORESET includes a set of REGs with a given numerology (e.g., SCS, CP length, etc.). CORESET can be configured via system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. Examples of parameters / information used to configure CORESET are as follows. One or more CORESETs are configured for a single UE, and multiple CORESETs can overlap in the time / frequency domain.

[0132] - controlResourceSetId: Indicates the identification information (ID) of CORESET.

[0133] - frequencyDomainResources: Represents the frequency domain resources of the CORESET. It is indicated through a bitmap, and each bit corresponds to an RB group (= 6 consecutive RBs). For example, the MSB (Most Significant Bit) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit with a bit value of 1 is allocated as the frequency domain resource of the CORESET.

[0134] - duration: Indicates the time domain resource of the CORESET. It indicates the number of consecutive OFDMA symbols that make up the CORESET. For example, duration has a value of 1 to 3.

[0135] - cce-REG-MappingType: Indicates the CCE-to-REG mapping type. Interleaved and non-interleaved types are supported.

[0136] - precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0137] - tci-StatesPDCCH: Indicates information (e.g., TCI-StateID) indicating the Transmission Configuration Indication (TCI) state for the PDCCH. The TCI state is used to provide the QCL (Quasi-Co-Location) relationship between the DL RS(s) within the RS set (TCI-state) and the PDCCH DMRS port.

[0138] - tci-PresentInDCI: Indicates whether the TCI field is included in the DCI.

[0139] - pdcch-DMRS-ScramblingID: Indicates information used to initialize the PDCCH DMRS scrambling sequence.

[0140] For PDCCH reception, the UE may monitor (e.g., perform blind decoding) a set of PDCCH candidates in a CORESET. The PDCCH candidates represent the CCE(s) that the UE monitors for PDCCH reception / detection. PDCCH monitoring may be performed in one or more CORESETs on an active DL BWP on each activated cell in which PDCCH monitoring is configured. The set of PDCCH candidates that the UE monitors is defined as a PDCCH Search Space (SS) set. The SS set may be a Common Search Space (CSS) set or a UE-specific Search Space (USS) set.

[0141] [Table 7] illustrates the PDCCH search space.

[0142] Search SpaceTypeRNTIUse CaseType0-PDCCHCommonSI-RNTI on a primary cellBroadcast of System InformationType0A-PDCCHCommonSI-RNTI on a primary cellBroadcast of System InformationType1-PDCCHCommonRA-RNTI or TC-RNTI on a primary cellMsg2, Msg4 in RACHType2-PDCCHCommonP-RNTI on a primary cellPagingSystem Information change notificationType3-PDCCHCommonINT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI or CS-RNTIGroup signalingUE SpecificC-RNTI, MCS-C-RNTI or CS-RNTIUE signaling (eg, PDSCH / PUSCH)

[0143] SS sets can be configured via system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. Each DL BWP of a serving cell can have up to S (e.g., 10) SS sets configured. For example, the following parameters / information can be provided for each SS set. Each SS set is associated with one CORESET, and each CORESET configuration can be associated with one or more SS sets.

[0144] - searchSpaceId: Indicates the ID of the SS set.

[0145] - controlResourceSetId: Indicates the CORESET associated with the SS set.

[0146] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period period (in slot units) and the PDCCH monitoring period offset (in slot units).

[0147] - monitoringSymbolsWithinSlot: Indicates the first OFDMA symbol(s) for PDCCH monitoring within the slot where PDCCH monitoring is configured. It is indicated through a bitmap, and each bit corresponds to each OFDMA symbol within the slot. The MSB of the bitmap corresponds to the first OFDM symbol within the slot. The OFDMA symbol(s) corresponding to the bit(s) with a bit value of 1 corresponds to the first symbol(s) of the CORESET within the slot.

[0148] - nrofCandidates: AL={1, 2, 4, 8, 16} indicates the number of PDCCH candidates (e.g., one of 0, 1, 2, 3, 4, 5, 6, 8).

[0149] - searchSpaceType: Indicates whether the SS type is CSS or USS.

[0150] - DCI format: Indicates the DCI format of the PDCCH candidate.

[0151] Based on the CORESET / SS set configuration, a UE can monitor PDCCH candidates in one or more SS sets within a slot. An opportunity (e.g., time / frequency resources) for monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities can be configured within a slot.

[0152] Uplink (DL) physical channel / signal

[0153] (1) PUSCH

[0154] PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI), and is transmitted based on a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH can be dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PUSCH transmission is accompanied by PDCCH, but in CS, PUSCH transmission is not accompanied by PDCCH. CS includes Type-1 Configured Grant (CG) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by higher layers. In Type-2 CG, some of the parameters for PUSCH transmission are signaled by higher layers, and the rest are signaled by PDCCH. Basically, in CS, PUSCH transmission is not accompanied by PDCCH.

[0155] (2) PUCCH

[0156] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0157] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0158] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): This is a reception response signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). The HARQ-ACK response may include positive ACK (simply, ACK), negative ACK (NACK), Discontinuous Transmission (DTX), or NACK / DTX. HARQ-ACK can be used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK can be generated on a TB-by-TB / CBG-by-CBG basis.

[0159] - CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), and PTI (Precoding Type Indicator).

[0160] [Table 8] illustrates PUCCH formats. PUCCH formats can be categorized based on UCI payload size, transmission length (e.g., the number of symbols constituting a PUCCH resource), and transmission structure. PUCCH formats can be categorized into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4) based on transmission length.

[0161] PUCCH formatLength in OFDM symbols Number of bitsUsageEtc01 - 2≤2HARQ, SRSequence selection14 - 14≤2HARQ, [SR]Sequence modulation21 - 2>2HARQ, CSI, [SR]CP-OFDM34 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(no UE multiplexing)44 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(Pre DFT OCC)

[0162] (0) PUCCH Format 0 (PF0)

[0163] - Supported UCI payload sizes: up to K bits (e.g. K = 2)

[0164] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g. X = 2)

[0165] - Transmission structure: Consists of only UCI signals without DM-RS, and transmits the UCI status by selecting and transmitting one of multiple sequences.

[0166] (1) PUCCH Format 1 (PF1)

[0167] - Supported UCI payload sizes: up to K bits (e.g. K = 2)

[0168] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g. Y = 4, Z = 14)

[0169] Transmission Structure: DM-RS and UCI are configured in TDM format on different OFDM symbols, with UCI multiplying a specific sequence with modulation (e.g., QPSK) symbols. Cyclic Shift (CS) / Orthogonal Cover Code (OCC) is applied to both UCI and DM-RS to support CDM between multiple PUCCH resources (following PUCCH Format 1) (within the same RB).

[0170] (2) PUCCH Format 2 (PF2)

[0171] - Supported UCI payload size: more than K bits (e.g. K = 2)

[0172] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g. X = 2)

[0173] - Transmission structure: DMRS and UCI are configured / mapped in FDM format within the same symbol, and are transmitted by applying only IFFT without DFT to the encoded UCI bits.

[0174] (3) PUCCH Format 3 (PF3)

[0175] - Supported UCI payload size: more than K bits (e.g. K = 2)

[0176] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g. Y = 4, Z = 14)

[0177] Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and transmitted by applying DFT to the corrupted UCI bits. OCC is applied to UCI at the DFT front end, and CS (or IFDM mapping) is applied to DMRS to support multiplexing to multiple terminals.

[0178] (4) PUCCH Format 4 (PF4)

[0179] - Supported UCI payload size: more than K bits (e.g. K = 2)

[0180] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g. Y = 4, Z = 14)

[0181] - Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and a structure that transmits without multiplexing between terminals by applying DFT to the encoded UCI bits.

[0182] Beam Management (BM)

[0183] BM procedures are L1 (layer 1) / L2 (layer 2) procedures for acquiring and maintaining a set of base station (e.g., gNB, TRP, etc.) and / or terminal (e.g., UE) beams that can be used for downlink (DL) and uplink (UL) transmission / reception, and may include the following procedures and terminology.

[0184] - Beam measurement: An operation in which a base station or UE measures the characteristics of a received beam-forming signal.

[0185] - Beam determination: An operation in which a base station or UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0186] - Beam sweeping: The operation of covering a spatial area using a transmit and / or receive beam over a predetermined time interval in a predetermined manner.

[0187] - Beam report: An operation in which a UE reports information about a beam-formed signal based on beam measurement.

[0188] The BM procedure can be divided into (1) a DL BM procedure using SS (synchronization signal) / PBCH (physical broadcast channel) Block or CSI-RS, and (2) a UL BM procedure using SRS (sounding reference signal).

[0189] Additionally, each BM procedure may include Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.

[0190]

[0191] The DL BM procedure may include (1) transmission of beamformed DL RSs (reference signals) (e.g., CSI-RS or SS Block (SSB)) of the base station and (2) beam reporting of the terminal.

[0192] Here, beam reporting may include preferred DL RS ID(identifier)(s) and corresponding L1-RSRP (Reference Signal Received Power).

[0193] The above DL RS ID may be an SSBRI (SSB Resource Indicator) or a CRI (CSI-RS Resource Indicator).

[0194] As shown in Figure 9, SSB beams and CSI-RS beams can be used for beam measurement. The measurement metric is L1-RSRP per resource / block. SSB is used for coarse beam measurement, and CSI-RS can be used for fine beam measurement. SSB can be used for both Tx beam sweeping and Rx beam sweeping.

[0195] Rx beam sweeping using SSB can be performed by the UE changing the Rx beam for the same SSBRI across multiple SSB bursts, where one SS burst contains one or more SSBs, and one SS burst set contains one or more SSB bursts.

[0196]

[0197] <SSB를 이용한 DL BM>

[0198] Figure 10 is a flowchart showing an example of a DL BM procedure using SSB.

[0199] The configuration for beam report using SSB is performed during CSI / beam configuration in RRC connected state (or RRC connected mode).

[0200] - The terminal receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList including SSB resources used for BM from the base station (S410).

[0201] [Table 9] shows an example of CSI-ResourceConfig IE, and as shown in [Table 9], BM configuration using SSB is not defined separately, and SSB is set as a CSI-RS resource.

[0202]

[0203] In [Table 9], the csi-SSB-ResourceSetList parameter indicates a list of SSB resources used for beam management and reporting in a single resource set. Here, the SSB resource set can be set to {SSBx1, SSBx2, SSBx3, SSBx4, ...}. The SSB index can be defined from 0 to 63.

[0204] - The terminal receives SSB resources from the base station based on the CSI-SSB-ResourceSetList (S420).

[0205] - When CSI-RS reportConfig related to reporting on SSBRI and L1-RSRP is set, the terminal reports (beam) the best SSBRI and the corresponding L1-RSRP to the base station (S430).

[0206] That is, when the reportQuantity of the above CSI-RS reportConfig IE is set to 'ssb-Index-RSRP', the terminal reports the best SSBRI and the corresponding L1-RSRP to the base station.

[0207] And, if the terminal sets the CSI-RS resource in the same OFDM symbol(s) as the SSB (SS / PBCH Block) and 'QCL-TypeD' is applicable, the terminal can assume that the CSI-RS and SSB are quasi co-located from the 'QCL-TypeD' perspective.

[0208] Here, the QCL TypeD may mean that the antenna ports are QCL-connected from a spatial Rx parameter perspective. When a terminal receives multiple DL antenna ports in a QCL Type D relationship, the same reception beam may be applied. In addition, the terminal does not expect the CSI-RS to be configured in an RE that overlaps with the SSB RE.

[0209] <CSI-RS를 이용한 DL BM>

[0210] Regarding the usage of CSI-RS, i) if the repetition parameter is set to a specific CSI-RS resource set and TRS_info is not set, CSI-RS is used for beam management. ii) if the repetition parameter is not set and TRS_info is set, CSI-RS is used for TRS (tracking reference signal). iii) if the repetition parameter is not set and TRS_info is not set, CSI-RS is used for CSI acquisition.

[0211] This repetition parameter can only be set for CSI-RS resource sets associated with a CSI-ReportConfig that has a report of L1 RSRP or 'No Report (or None)'.

[0212] If a terminal is configured with a CSI-ReportConfig with reportQuantity set to 'cri-RSRP' or 'none', and a CSI-ResourceConfig (higher layer parameter resourcesForChannelMeasurement) for channel measurement does not include a higher layer parameter 'trs-Info' and includes an NZP-CSI-RS-ResourceSet with a higher layer parameter 'repetition' set, the terminal may be configured with only the same number of ports (1-port or 2-port) with the higher layer parameter 'nrofPorts' for all CSI-RS resources in the NZP-CSI-RS-ResourceSet.

[0213] (higher layer parameter) When repetition is set to 'ON', it is related to the Rx beam sweeping procedure of the terminal. In this case, when the terminal receives the NZP-CSI-RS-ResourceSet, the terminal can assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same Tx beam. Here, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet can be transmitted in a different OFDM symbol. In addition, the terminal does not expect to receive different periods in periodicityAndOffset among all CSI-RS resources in the NZP-CSI-RS-Resourceset.

[0214] On the other hand, when Repetition is set to 'OFF', it is related to the Tx beam sweeping procedure of the base station. In this case, when repetition is set to 'OFF', the terminal does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through a different Tx beam.

[0215] Figure 11 illustrates an example of a DL BM procedure using CSI-RS. Figure 11 (a) illustrates a terminal's Rx beam determination (or refinement) procedure, and Figure 11 (b) illustrates a base station's Tx beam sweeping procedure. Figure 11 (a) illustrates a case where the repetition parameter is set to 'ON', and Figure 11 (b) illustrates a case where the repetition parameter is set to 'OFF'.

[0216] Referring to Fig. 11 (a) and Fig. 12, the terminal's Rx beam determination process will be examined.

[0217] Figure 12 is a flowchart showing an example of a terminal's reception beam determination process.

[0218] - The terminal receives an NZP CSI-RS resource set IE including a higher layer parameter repetition from the base station via RRC signaling (S610). Here, the repetition parameter is set to 'ON'.

[0219] - The terminal repeatedly receives resource(s) within the CSI-RS resource set with repetition 'ON' in different OFDM symbols through the same Tx beam (or DL ​​spatial domain transmission filter) of the base station (S620).

[0220] - The terminal determines its own Rx beam (S630).

[0221] - The terminal omits the CSI report (S640). In this case, the reportQuantity of the CSI report config can be set to 'No report (or None)'.

[0222] That is, the terminal can omit the CSI report when repetition is set to 'ON'.

[0223] Referring to Fig. 11 (b) and Fig. 13, the Tx beam determination process of the base station is examined.

[0224] Figure 13 is a flowchart showing an example of a transmission beam determination process of a base station.

[0225] - The terminal receives an NZP CSI-RS resource set IE including a higher layer parameter repetition from the base station via RRC signaling (S710). Here, the repetition parameter is set to 'OFF' and is related to the base station's Tx beam sweeping procedure.

[0226] - The terminal receives resources within the CSI-RS resource set with repetition set to 'OFF' through different Tx beams (DL spatial domain transmission filters) of the base station (S720).

[0227] - The terminal selects (or determines) the best beam (S740)

[0228] - The terminal reports the ID and related quality information (e.g., L1-RSRP) for the selected beam to the base station (S740). In this case, the reportQuantity of the CSI report config can be set to 'CRI + L1-RSRP'.

[0229] That is, the terminal reports the CRI and the L1-RSRP for the CSI-RS to the base station when the CSI-RS is transmitted for the BM.

[0230] Figure 14 shows an example of resource allocation in the time and frequency domains related to the operation of Figure 11.

[0231] That is, when repetition 'ON' is set in the CSI-RS resource set, multiple CSI-RS resources are repeatedly used by applying the same transmission beam, and when repetition 'OFF' is set in the CSI-RS resource set, different CSI-RS resources can be seen to be transmitted with different transmission beams.

[0232] <dl bm 관련 빔 지시 (beam indication)>

[0233] A terminal may receive an RRC configuration list of at most M candidate Transmission Configuration Indication (TCI) states for the purpose of at least a Quasi Co-location (QCL) indication, where M may be 64.

[0234] Each TCI state can be configured with one RS set. At least each ID of a DL RS for spatial QCL purposes (QCL Type D) within an RS set can refer to one of the DL RS types, such as SSB, P-CSI RS, SP-CSI RS, or A-CSI RS.

[0235] At least the initialization / update of the IDs of DL RS(s) within the RS set used for spatial QCL purposes can be performed at least through explicit signaling.

[0236] [Table 10] shows an example of a TCI-State IE. A TCI-State IE associates one or two DL reference signals (RS) with a corresponding quasi co-location (QCL) type.

[0237]

[0238]

[0239] In Table 10, the bwp-Id parameter indicates the DL BWP where the RS is located, the cell parameter indicates the carrier where the RS is located, and the referencesignal parameter indicates the reference antenna port(s) that is the source of quasi co-location for the corresponding target antenna port(s) or a reference signal including the same. The target antenna port(s) may be a CSI-RS, a PDCCH DMRS, or a PDSCH DMRS. For example, in order to indicate QCL reference RS information for the NZP CSI-RS, the corresponding TCI state ID may be indicated in the NZP CSI-RS resource configuration information. In another example, in order to indicate QCL reference information for the PDCCH DMRS antenna port(s), the TCI state ID may be indicated in each CORESET configuration. In another example, in order to indicate QCL reference information for the PDSCH DMRS antenna port(s), the TCI state ID may be indicated through DCI.

[0240]

[0241] <QCL(Quasi-Co Location)>

[0242] Antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be in a QC / QCL (quasi co-located or quasi co-location) relationship if the properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on another antenna port is carried.

[0243] Here, the channel characteristics include one or more of delay spread, Doppler spread, frequency / Doppler shift, average received power, received timing / average delay, and spatial RX parameter. Here, the spatial Rx parameter refers to a spatial (reception) channel characteristic parameter such as angle of arrival.

[0244] The UE may be configured with a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config to decode the PDSCH according to the detected PDCCH having the intended DCI for the UE and the given serving cell. The M depends on the UE capability.

[0245] Each TCI-State contains parameters for establishing a quasi co-location relationship between one or two DL reference signals and the DM-RS port of the PDSCH.

[0246] The quasi-colocation relationship is set by the higher layer parameters qcl-Type1 for the first DL RS and qcl-Type2 (if set) for the second DL RS. For two DL RSs, the QCL types are not the same, regardless of whether the references are the same DL RS or different DL RSs.

[0247] The quasi co-location type corresponding to each DL RS is given by the higher layer parameter qcl-Type of QCL-Info, which can take one of the following values:

[0248] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0249] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0250] - 'QCL-TypeC': {Doppler shift, average delay}

[0251] - 'QCL-TypeD': {Spatial Rx parameter}

[0252] For example, if the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna ports can be instructed / configured to be QCL with a specific TRS from a QCL-Type A perspective and with a specific SSB from a QCL-Type D perspective. A terminal that has received such an instruction / configuration can receive the corresponding NZP CSI-RS using the Doppler and delay values ​​measured at the QCL-TypeA TRS, and apply the reception beam used for QCL-TypeD SSB reception to the corresponding NZP CSI-RS reception.

[0253] The UE can receive an activation command by MAC CE signaling, which is used to map up to eight TCI states to codepoints in the DCI field 'Transmission Configuration Indication'.

[0254]

[0255] Depending on the terminal implementation, UL BM may or may not have beam reciprocity (or beam correspondence) between the Tx beam and the Rx beam. If reciprocity between the Tx beam and the Rx beam is established at both the base station and the terminal, the UL beam pair can be aligned through the DL beam pair. However, if reciprocity between the Tx beam and the Rx beam is not established at either the base station or the terminal, a UL beam pair determination process is required separately from the DL beam pair determination.

[0256] Additionally, even if both the base station and the terminal maintain beam correspondence, the base station can use the UL BM procedure for DL ​​Tx beam determination without the terminal requesting reporting of a preferred beam.

[0257] UL BM can be performed via beamformed UL SRS transmission, and whether UL BM is applied to an SRS resource set is determined by the (higher layer parameter) usage. When usage is set to 'BeamManagement (BM)', only one SRS resource can be transmitted for each of multiple SRS resource sets at a given time instant.

[0258] A UE can be configured with one or more Sounding Reference Symbol (SRS) resource sets (via higher layer signaling, RRC signaling, etc.) configured by (higher layer parameter) SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≥1 SRS resources (higher later parameter SRS-resource). Here, K is a natural number, and the maximum value of K is indicated by SRS_capability.

[0259] Similar to DL BM, UL BM procedure can be divided into Tx beam sweeping of the terminal and Rx beam sweeping of the base station.

[0260] Figure 15 shows an example of a UL BM procedure using SRS. Figure 15 (a) shows a base station's Rx beam determination procedure, and Figure 15 (b) shows a terminal's Tx beam sweeping procedure.

[0261] Figure 16 is a flowchart showing an example of a UL BM procedure using SRS.

[0262] - The terminal receives RRC signaling (e.g., SRS-Config IE) from the base station including a usage parameter (higher layer parameter) set to 'beam management' (S1010).

[0263] Table 11 shows an example of an SRS-Config IE (Information Element), which is used to configure SRS transmission. The SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set represents a set of SRS-resources.

[0264] The network can trigger the transmission of an SRS resource set using the configured aperiodicSRS-ResourceTrigger (L1 DCI).

[0265]

[0266] In Table 11, usage represents a higher layer parameter indicating whether the SRS resource set is used for beam management and for codebook-based or non-codebook-based transmission. The usage parameter corresponds to the L1 parameter 'SRS-SetUse'. 'spatialRelationInfo' is a parameter indicating the establishment of a spatial relation between a reference RS and a target SRS. Here, the reference RS can be an SSB, CSI-RS, or SRS corresponding to the L1 parameter 'SRS-SpatialRelationInfo'. The usage is set for each SRS resource set.

[0267] - The terminal determines the Tx beam for the SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S1020). Here, the SRS-SpatialRelation Info is set for each SRS resource and indicates whether to apply the same beam as the beam used in SSB, CSI-RS, or SRS for each SRS resource. In addition, the SRS-SpatialRelationInfo may or may not be set for each SRS resource.

[0268] - If SRS-SpatialRelationInfo is set in the SRS resource, the same beam used in SSB, CSI-RS, or SRS is applied for transmission. However, if SRS-SpatialRelationInfo is not set in the SRS resource, the terminal randomly determines a Tx beam and transmits SRS through the determined Tx beam (S1030).

[0269] More specifically, for P-SRS with 'SRS-ResourceConfigType' set to 'periodic':

[0270] i) If SRS-SpatialRelationInfo is set to 'SSB / PBCH', the UE transmits the corresponding SRS resource by applying the same spatial domain transmission filter (or generated from the same filter) as the spatial domain Rx filter used for receiving the SSB / PBCH; or

[0271] ii) If SRS-SpatialRelationInfo is set to 'CSI-RS', the UE transmits SRS resources by applying the same spatial domain transmission filter used for receiving periodic CSI-RS or SP CSI-RS; or

[0272] iii) If SRS-SpatialRelationInfo is set to 'SRS', the UE transmits the corresponding SRS resource by applying the same spatial domain transmission filter used for transmitting periodic SRS.

[0273] Beam decision and transmission behavior similar to the above can be applied even when 'SRS-ResourceConfigType' is set to 'SP-SRS' or 'AP-SRS'.

[0274] - Additionally, the terminal may or may not receive feedback on SRS from the base station in the following three cases (S1040).

[0275] i) If Spatial_Relation_Info is set for all SRS resources within the SRS resource set, the terminal transmits SRS using the beam indicated by the base station. For example, if Spatial_Relation_Info indicates the same SSB, CRI, or SRI, the terminal repeatedly transmits SRS using the same beam. This case corresponds to G(a) for the purpose of the base station selecting the Rx beam.

[0276] ii) Spatial_Relation_Info may not be set for all SRS resources within the SRS resource set. In this case, the terminal can freely change the SRS beam while transmitting. That is, this case corresponds to Fig. G(b), where the terminal sweeps the Tx beam.

[0277] iii) Spatial_Relation_Info may be set only for some SRS resources within an SRS resource set. In this case, SRS is transmitted using the indicated beam for the set SRS resources, and for SRS resources for which Spatial_Relation_Info is not set, the terminal may arbitrarily apply a Tx beam for transmission.

[0278] NES (network energy saving)

[0279] 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.

[0280] 1. Specify SSB-less SCell operation for inter-band CA for FR1 and co-located cells, if found feasible by RAN4 study, where a UE measures SSB transmitted on PCell or another SCell for an SCell’s time / frequency synchronization (including downlink AGC), and L1 / L3 measurements, including potential enhancement on SCell activation procedures if necessary [RAN4, RAN2]2. Specify enhancement on cell DTX / DRX mechanism including the alignment of cell DTX / DRX and UE DRX in RRC_CONNECTED mode, and inter-node information exchange on cell DTX / DRX [RAN2, RAN1, RAN3]· Note: No change for SSB transmission due to cell DTX / DRX.· Note: The impact to IDLE / INACTIVE UEs due to the above enhancement should be avoided.3. Specify the following techniques in spatial and power domains· Specify necessary enhancements on CSI and beam management related procedures including measurement and report, and signaling to enable efficient adaptation of spatial elements (e.g.antenna ports, active transceiver chains) [RAN1, RAN2]· Specify necessary enhancements on CSI related procedures including measurement and report, and signaling to enable efficient adaptation of power offset values between PDSCH and CSI-RS [RAN1, RAN2]· Note: Above objectives are only for UE specific channels / signals· Note: Legacy UE CSI / CSI-RS capabilities applies when considering total number of CSI reports and requirements4. Specify mechanism(s) to prevent legacy UEs camping on cells adopting the Rel-18 NES techniques, if necessary [RAN2]5. Specify CHO procedure enhancement(s) in case source / target cell is in NES mode [RAN2]6. Specify inter-node beam activation and enhancements on restricting paging in a limited area [RAN3].7. Specify the corresponding RRM / RF core requirements, if necessary, for the above features [RAN4].

[0281] Depending on 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.

[0282] Figure 17 illustrates an example of the operation procedure of a base station supporting NES technology. Referring to Figure 17, the base station identifies the NES solution(s) to be applied. The NES solution(s) may be related to control of signal transmission and reception (e.g., on / off), beam operation, handover procedures, channel measurement and reporting, etc. The NES solution(s) to be applied may be adaptively selected or predefined depending on the current situation (e.g., cell load level, characteristics of connected terminals, etc.). The base station that 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 can perform operations for the NES based on previously performed signaling. That is, based on system information, configuration information, and control information transmitted through signaling, the base station can turn on / off transmission and reception of specific signals, turn on / off elements in the spatial domain, or adjust resources for transmission and reception of measurement signals.

[0283] Through a procedure similar to that in Fig. 17, NES technology can be implemented. Examples of NES solutions that can be implemented through a procedure similar to that in Fig. 17 are as follows.

[0284] · 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).

[0285] · Inter-system energy saving solution: NG-RAN nodes that own capacity booster cells can autonomously transition those cells to an inactive state.

[0286] · 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.

[0287] · Cell DTX / DRX 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) may be commonly set for terminals within a cell having the feature. Here, the cell DTX pattern and the cell DRX pattern may be set and activated separately, and up to two cell DTX / DRX patterns may be set per MAC entity. When cell DTX is set and activated, at least one of monitoring for SPS opportunities or monitoring PDCCH may 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 may be stopped during the cell DRX inactivity period. Cell DTX / DRX may be activated / deactivated via RRC signaling or L1 group common signaling.

[0288] · 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.

[0289] · 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.

[0290] · 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.

[0291] CSI Measurement and Reporting

[0292] Figure 18 illustrates an example of a procedure for CSI measurement and reporting.

[0293] Referring to FIG. 18, the base station transmits configuration information for CSI to the terminal. The configuration information for CSI may include information related to CSI-RS resources or resource sets (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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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).

[0309] 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.

[0310] 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).

[0311] 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.

[0312] Specific embodiments of the present disclosure

[0313] 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 multiple sub-configurations while taking overhead into account, and proposes various embodiments for transmitting CSIs for sub-configurations.

[0314] A base station can operate technologies such as controlling the on / off of a UE for a certain duration in the time axis for the purpose of NES, controlling transmission / reception resources for UE-common or UE-specific signals / channels, changing the amount of frequency-axis resources, controlling transmission power, or turning on / off an 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 a state in which at least one of the NES_techs is applied is referred to as a 'NES mode' or 'NES state'. For example, examples of state control of antenna elements according to the NES mode are as shown in FIGS. 19A to 19C below. Referring to FIGS. 19A to 19C, energy saving is possible by adaptively turning on / off some antenna elements among a plurality of antenna elements connected to a plurality of transmit radio units (TxRUs). The base station may inform the terminal of which NES_tech(s) are applied for each NES_tech or NES_tech group [Approach 1], or may pre-configure the corresponding NES_tech or NES_tech group(s) for each code-point of a specific indicator [Approach 2]. Here, the specific indicator may be indicated by DCI or MAC CE, etc., or may be configured by upper layer signaling.

[0315] 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.

[0316] 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.).

[0317] Meanwhile, at least one of the following CSI frameworks may be introduced:

[0318] - 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.

[0319] - 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.

[0320] - 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.

[0321]

[0322] For the CSI frameworks described above, the CSI reporting method can be defined through at least one of the following options.

[0323] - 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.

[0324] - 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.

[0325] - 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.

[0326] 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.

[0327] 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 A1 that constitutes 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] As in the aforementioned options #1 and #3, a single CSI report may include CSI(s) corresponding to multiple AP count values ​​and / or multiple power offset values ​​of a terminal. This is to maintain an efficient communication state with terminals after the NES operation of the base station, and may be utilized to determine in advance the impact of AP count adjustment and / or power adjustment before performing the NES operation. However, when feeding back CSI per sub-configuration as described above, the amount of CSI information increases compared to the existing CSI report, which may significantly increase the payload size. In addition, since the amount of uplink resources for CSI reporting increases due to the increased payload size, the amount of resources for data transmission via uplink may decrease. Therefore, the present disclosure proposes a technique for supporting feedback of CSI information corresponding to multiple AP count values ​​and / or multiple power offset values ​​of a terminal for a single CSI report, while reducing feedback overhead. Hereinafter, in the present disclosure, ' / ' means 'and', 'or', or 'and / or' depending on the context.

[0332] [Example #1] A CSI reporting method that reduces overhead by configuring at least one occasion in which the CSI is carried and differentiating the information included in each opportunity when a terminal includes CSI(s) corresponding to multiple AP count values ​​and / or multiple power offset values ​​for one CSI report.

[0333] In the present disclosure, situations in which a terminal must carry CSI corresponding to multiple AP count values ​​and / or multiple power offset values ​​for a single CSI report may be as follows. However, the embodiments of the present disclosure are not limited to the situations described below. In the following description, "carrying" may be understood as "transmitting" CSI(s) through a corresponding opportunity or resource, or "mapping" a signal representing CSI(s).

[0334] As in Option #1, if CSIs considering multiple AP count values ​​and / or multiple power offset values ​​set in a single CSI report are all included in a single CSI report, CSIs corresponding to multiple AP count values ​​and / or multiple power offset values ​​may be transmitted through a single CSI report. Alternatively, as in Option #1, if CSIs considering multiple AP count values ​​and / or multiple power offsets are included in a single CSI report through the configuration / instruction of the base station, CSIs corresponding to multiple AP count values ​​and / or multiple power offset values ​​may be transmitted through a single CSI report. In other words, multiple CSIs corresponding to multiple sub-configurations, i.e., CSI sub-reports, may be transmitted.

[0335] At this time, the AP count values ​​and / or power offset values ​​set / instructed through the base station may be part of the AP count values ​​and / or power offset values ​​set in the corresponding CSI report. Or, as in option #3, even if multiple AP count values ​​and / or multiple power offset values ​​are set in one CSI report, if CSIs that consider some AP count values ​​and / or some power offset values ​​through judgment / decision / selection of the terminal are included in one CSI report based on criteria set in advance by the base station or defined in advance, CSIs corresponding to multiple AP count values ​​and / or multiple power offset values ​​may be transmitted through one CSI report. Alternatively, in accordance with a combination of Option #1 and Option #3, if CSIs considering multiple AP count values ​​and / or multiple power offset values ​​(e.g., some of the AP count values ​​and / or power offset values ​​set in the corresponding CSI report) through the configuration / instruction of the base station are included in one CSI report, CSIs considering some AP count values ​​and / or some power offset values ​​judged / decided / selected by the terminal based on criteria set in advance by the base station or defined in advance, CSIs corresponding to multiple AP count values ​​and / or multiple power offset values ​​may be transmitted through one CSI report.

[0336] FIG. 20 illustrates an example of a procedure for reporting CSIs for sub-configurations on multiple occasions according to one embodiment of the present disclosure. FIG. 20 illustrates a method performed by a terminal.

[0337] 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 the CSI report. 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, the configuration information may include a list of multiple sub-configurations, and the subsets of the number of APs may be expressed in the form of a bitmap, and the power offset values ​​may be expressed in the form of a sum of a base value and a difference value.

[0338] In step S2003, the terminal generates multiple CSIs based on the sub-configurations included in the CSI reporting configuration. That is, the terminal can receive at least one CSI-RS through CSI-RS resources linked to the configuration information for the CSI report, and measure a channel or interference using the received at least one CSI-RS. In addition, the terminal can generate at least one CSI including at least one item indicated by the configuration information. For example, the terminal can generate CSIs for each sub-configuration.

[0339] In step S2005, the terminal determines multiple opportunities for CSI. The terminal determines multiple opportunities to transmit CSI for sub-configurations of a single CSI report. According to various embodiments, the terminal may determine multiple opportunities based on configuration information for the CSI report. The multiple opportunities may be indicated by the configuration information or derived from resources indicated by the configuration information. To this end, the terminal may verify or obtain additional information necessary to determine the multiple opportunities.

[0340] In step S2007, the terminal transmits CSIs. In other words, the terminal transmits CSIs across multiple opportunities. The information transmitted in each opportunity may be CSI corresponding to a single sub-set or a portion of the CSIs. In other words, each opportunity may correspond to a single sub-set, or each opportunity may correspond to a portion of a combination of CSIs (e.g., a common portion of the CSIs).

[0341] As described with reference to FIG. 20, multiple CSIs can be transmitted over multiple opportunities. Below, the present disclosure describes embodiments that set / indicate multiple opportunities in which CSI(s) corresponding to a single CSI report are carried.

[0342]

[0343] [Embodiment #1-1-1] For P / SP (periodic / semi-persistent) CSI reporting, a reporting cycle and a slot index at which reporting is to be performed for each cycle can be set / indicated using at least one parameter (e.g., reportSlotConfig and / or reportSlotOffsetList) of the related configuration information. Specifically, for P (periodic)-CSI reporting and SP (semi-persistent)-CSI reporting on PUCCH, the cycle and offset can be set by the reportSlotConfig parameter. For SP-CSI reporting on PUCCH, the cycle is set by the reportSlotConfig parameter, and the offset can be determined by indicating one of a plurality of candidate values ​​set by the reportSlotOffsetList parameter through a DCI that activates the corresponding PUSCH. Here, according to one embodiment, slots belonging to N periods may be defined as a set of multiple opportunities in which CSI(s) corresponding to one CSI report are carried. That is, N opportunities may be included in one set. To this end, an agreement may be defined between the base station and the terminal regarding the starting points of the N periods. For example, a method may be used to group N periods into one set based on a specific SFN index (e.g., SFN index 0). As another example, a method may be used to group N periods into one set based on a specific slot index (e.g., in the case of SP-CSI reporting, a slot in which an activation DCI or MAC-CE is received, or a slot 3 msec after the corresponding HARQ-ACK transmission after receiving a MAC-CE). As a result, N periods from a reference time point may be determined as one set, and the next N periods may be determined as another set.

[0344] According to embodiment #1-1-1, the terminal may receive information related to a CSI reporting cycle and a slot index at which reporting is to be performed for each cycle from the base station, and determine multiple opportunities based on the received information. Specifically, the terminal may select as many slots (e.g., N slots) as necessary to transmit CSI sub-reports including CSIs for sub-configurations of one CSI report among the slots for each cycle indicated by the received information, and transmit the CSIs using the selected slots.

[0345] [Example #1-1-2] For P / SP CSI reporting, multiple slots per period can be set as resources capable of carrying CSI. For example, if the reporting period is set / indicated as P and the offset value is set / indicated as Y, in addition to the Y-th slot within the period, the Y+K, Y+2×K, …, Y+M×K-th slots can be designated as resources capable of carrying CSI. Here, the values ​​of K and M can be set in advance, and for example, the value of K can be set equal to the value of Y. At this time, the N slots set as resources capable of carrying CSI can be defined as a set of multiple opportunities in which CSI(s) corresponding to one CSI report are carried. That is, N opportunities can be included in one set. An agreement can be defined between the base station and the terminal for the N starting points. At this time, if M and N are the same, the slots capable of carrying CSI within one reporting period can form one set. If M and N are different or even if M and N are the same, it is possible to group N slots into one set based on a specific SFN index (e.g., SFN index 0), for example. As another example, it is possible to group N slots into one set based on a specific slot index (e.g., in case of SP-CSI reporting, a slot in which an active DCI or MAC-CE is received, or a slot 3 msec after a corresponding HARQ-ACK transmission following MAC-CE reception). As a result, N slots from a reference time point can be determined as one set, and the next N slots can be determined as another set.

[0346] According to embodiment #1-1-2, the terminal can receive information related to the CSI reporting cycle and the start slot position (e.g., offset) of the cycle from the base station. In addition, the terminal can check information related to the number and interval of slots for CSI reporting within one cycle. Accordingly, the terminal can determine multiple opportunities based on the received information and the checked information. Specifically, the terminal can select as many slots (e.g., N slots) as necessary to transmit CSIs for sub-configurations of one CSI report among the slots for CSI reporting included in at least one cycle, and can transmit CSIs using the selected slots.

[0347] [Embodiment #1-1-3] For AP (aperiodic) CSI reporting, multiple opportunities corresponding to one CSI report can be indicated by allocating multiple PUSCH resources using a UL grant. For example, in the case of a UL grant that does not schedule a UL-SCH, an offset K value from slot n in which the UL grant is transmitted can be indicated by the reportSlotOffsetListDCI-0-1 or reportSlotOffsetListDCI-0-2 parameter. Alternatively, in the case of a UL grant that schedules a UL-SCH, a K2 value set in the TDRA table can be indicated. In this case, CSI reporting information can be carried in a PUSCH within a slot indicated by the offset K value or the K2 value. According to the present embodiment, N PUSCHs can be allocated at once through a UL grant. For example, N PUSCHs can be scheduled at once at an interval of X slots from a slot indicated by the offset K or K2. Here, the value of X may be predefined, for example, as 1, or may be set by higher layer signaling or indicated via DCI. As another example, N PUSCHs may be allocated at a time using the multi-PUSCH scheduling DCI introduced in Rel-16 / Rel-17.

[0348] According to Example #1-1-3, a terminal may receive a UL grant from a base station, which includes information related to a plurality of slots for reporting CSI, and may transmit CSIs using opportunities within slots determined based on the information included in the UL grant. To this end, the terminal may check information related to slot intervals including opportunities, select slots (e.g., N slots) corresponding to the number of slots required for transmitting CSIs according to the slot intervals, and transmit CSIs using the selected slots.

[0349] Next, the present disclosure describes embodiments for configuring CSI for each opportunity, when CSI(s) corresponding to a single CSI report are configured / instructed to be carried across N opportunities. The embodiments described below relate to how CSI sub-reports are mapped to multiple opportunities.

[0350] The N opportunities can be set / indicated by [Embodiment #1-1-1], [Embodiment #1-1-2] or [Embodiment #1-1-3]. Alternatively, it can be indicated whether the N opportunities are to be applied via DCI, group-common DCI or MAC-CE, and the N opportunities can be applied only for a certain period of time after being indicated. As described above, when a terminal needs to carry CSI(s) corresponding to multiple AP count values ​​and / or multiple power offset values ​​for one CSI report, each CSI can be indexed. For example, if CSI for number of APs N1 and power offset A1 is indexed as CSI#1, CSI for number of APs N2 and power offset A2 as CSI#2, and CSI for number of APs N3 and power offset A3 as CSI#3, the CSI overhead for each opportunity can be reduced by transmitting CSI#1 / 2 / 3 corresponding to a single CSI report differently for each opportunity. Here, the values ​​of N1 / N2 / N3 can be the same or different, and the values ​​of A1 / A2 / A3 can be the same or different. In the following description, an example is presented in which three CSIs correspond to a single CSI report, but the embodiments described below can also be applied when different numbers of CSIs correspond to a single CSI report. For example, each of the three CSIs described below can correspond to a CSI sub-configuration. In the present embodiments, the CSI index linked to each opportunity may be determined by a rule (e.g., in ascending or descending order of the index) or may be set / defined in advance.

[0351] [Example #1-2-1] Individual CSIs may be carried for each opportunity. For example, if N is 3, CSI#1 may be carried in the first opportunity, CSI#2 may be carried in the second opportunity, and CSI#3 may be carried in the third opportunity. According to Example #1-2-1, the terminal may determine multiple opportunities and transmit CSIs in a specified order in the determined opportunities.

[0352] [Example #1-2-2] Common information of multiple CSIs may be carried in a specific opportunity, and remaining information for each individual CSI may be carried in the remaining opportunity(s). Here, the common information may be understood as an item having the same value. That is, according to Example #1-2-2, the terminal may determine multiple opportunities, transmit a CSI sub-report including information having a common value of the CSIs in one opportunity, and transmit CSI sub-reports including the remainder excluding information having a common value in each CSI in a specified order in each opportunity.

[0353] For example, if N is 4, CSI is set to CRI+RI+LI+PMI+CQI, and common information is RI, RI values ​​for CSI#1 / 2 / 3 may be loaded in the first opportunity, CRI+LI+PMI+CQI information excluding RI among CSI#1 may be loaded in the second opportunity, CRI+LI+PMI+CQI information excluding RI among CSI#2 may be loaded in the third opportunity, and CRI+LI+PMI+CQI information excluding RI among CSI#3 may be loaded in the fourth opportunity. At this time, the positions of opportunities where common information is loaded may be defined in advance or set by higher layer signaling. And, which item of common information is may be defined in advance or set by higher layer signaling.

[0354] [Example #1-2-3] Baseline information (e.g., average value, minimum value, maximum value, median value) of multiple CSIs may be loaded in a specific opportunity, and differential values ​​from the baseline information for each individual CSI may be loaded in the remaining opportunity(s). That is, according to Example #1-2-3, the terminal may determine multiple opportunities, transmit a representative CSI or reference CSI including a representative value (e.g., baseline value) of items included in the CSIs in one opportunity, express the values ​​of items included in each CSI as relative values ​​with respect to the representative value, and transmit CSIs including at least one relative value in a specified order in each opportunity.

[0355] For example, if N is 4 and CSI is set to CRI+RI+LI+PMI+CQI, baseline information for CRI / RI / LI / PMI / CQI of CSI#1 / 2 / 3 may be carried in the first opportunity, differential values ​​from baseline information for CRI / RI / LI / PMI / CQI corresponding to CSI#1 may be carried in the second opportunity, differential values ​​from baseline information for CRI / RI / LI / PMI / CQI corresponding to CSI#2 may be carried in the third opportunity, and differential values ​​from baseline information for CRI / RI / LI / PMI / CQI corresponding to CSI#3 may be carried in the fourth opportunity. Here, the positions of opportunities where common information is carried may be defined in advance or set by upper layer signaling.

[0356] Additionally, a combination between [Example #1-2-2] and [Example #1-2-3] is also possible. For example, among CRI / RI / LI / PMI / CQI, RI may be loaded as common information in the first opportunity, baseline information for the remaining CRI / LI / PMI / CQI may be loaded in the first opportunity, and differential values ​​from baseline information for each CRI / LI / PMI / CQI corresponding to individual CSI may be loaded in the remaining opportunities.

[0357] [Example #1-2-4] By including all CSIs in each opportunity, but prioritizing information corresponding to a specific CSI index, relatively more content can be transmitted for information corresponding to the specific CSI index, and information corresponding to the remaining CSI indices can be abbreviated or at least partially omitted. In this case, CSI with a high priority can be transmitted using relatively more bits, and the remaining CSI(s) can be transmitted using relatively fewer bits. At this time, the specific CSI index can be different for each opportunity. That is, according to Example #1-2-4, the terminal determines multiple opportunities and generates CSI sub-reports to be transmitted in each opportunity by combining the CSIs. In generating each CSI sub-report, a significant CSI is defined, and the significant CSI is expressed with relatively more items and / or higher resolution than other CSIs. In addition, the terminal can transmit the generated CSI sub-reports in a specified order in each opportunity.

[0358] For example, if N is 3 and CSI is set to CRI+RI+LI+PMI+CQI, all items of CSI#1 and only CRI+RI of the remaining CSI#2 / 3 may be carried in the first opportunity, all items of CSI#2 and only CRI+RI of the remaining CSI#1 / 3 may be carried in the second opportunity, and all items of CSI#3 and only CRI+RI of the remaining CSI#1 / 2 may be carried in the third opportunity. As another example, when N is 3, both wideband (WB) information (e.g., PMI and / or CQI) and sub-band (SB) information (e.g., PMI and / or CQI) of CSI#1 may be carried in the first opportunity, and only WB information of the remaining CSI#2 / 3 may be carried, both WB information and SB information of CSI#2 may be carried in the second opportunity, and only WB information of the remaining CSI#1 / 3 may be carried, and both WB information and SB information of CSI#3 may be carried in the third opportunity, and only WB information of the remaining CSI#1 / 2 may be carried. Here, the WB information may include WB PMI and / or WB CQI, and the SB information may include SB PMI and / or SB CQI.

[0359] [Example #1-2-5] Compressed information of multiple CSIs may be carried in a specific opportunity, and information for each individual CSI may be carried in the remaining opportunity(s). For example, when N is 4, information for all of CSI#1 / 2 / 3 may be carried in the first opportunity, but compressed information for each CSI may be carried, CSI#1 may be carried in the second opportunity, CSI#2 may be carried in the third opportunity, and CSI#3 may be carried in the fourth opportunity. According to Example #1-2-5, the terminal may determine multiple opportunities, generate a compressed CSI sub-report by integrating the CSIs, and transmit the compressed CSI sub-report and the CSI sub-reports including each CSI in a specified order in each opportunity. In the present disclosure, compressed information may be referred to as abbreviated information, representative information, integrated information, or other terms having equivalent technical meanings.

[0360] Here, compression can be performed in a way that CSI is composed of only WB PMI and / or CQI without SB PMI and / or CQI, has different granularity for time domain / frequency domain / spatial domain basis, omits some information, or is composed of baseline value and difference value. Alternatively, in case of beam management related reports such as L1-RSRP or L1-SINR, compression can be performed in a way that reduces the number of CRI / RSRP / SINR values ​​for each CSI index. In this case, the positions of opportunities where compressed information of multiple CSIs are carried can be defined in advance or set by upper layer signaling.

[0361] [Example #1-3] For a CSI reporting configuration in which at least one sub-configuration is configured, a reporting cycle for each sub-configuration and a slot index for which reporting is to be performed in each cycle can be configured / indicated.

[0362] For P-CSI reporting and SP-CSI reporting on PUCCH, the period and offset can be set by parameters of the configuration information related to the report (e.g., reportSlotConfig). At this time, the corresponding parameters can be set for each sub-configuration. When the corresponding parameters are set for each sub-configuration, the period / offset values ​​can be set independently for each sub-configuration, or can be set using relative values ​​for a specific sub-configuration. For example, if the period is set to be the same for the sub-configurations, the reportSlotConfig parameter is set for sub-configuration #0, and a relative offset (e.g., 2 slots) is set for sub-configuration #1, the terminal can transmit CSI corresponding to sub-configuration #0 in slot n, and CSI corresponding to sub-configuration #1 in slot n+2.

[0363] For SP-CSI reporting on PUCCH, the period is set by a first parameter (e.g., reportSlotConfig) of the configuration information related to the report, and the offset can be set by indicating one of a plurality of candidate values ​​set by a second parameter (e.g., reportSlotOffsetList) of the configuration information related to the report through a DCI that activates PUSCH. The reportSlotConfig parameter and / or the reportSlotOffsetList parameter can be individually set for each sub-configuration. When the parameter(s) are set for each sub-configuration, the period / offset values ​​can be set independently for each sub-configuration, or can be set using relative values ​​for a specific sub-configuration. For example, if the reportSlotOffsetList#0 parameter is set in sub-configuration#0 and reportSlotOffsetList#1 is set in sub-configuration#1, and if the k-th offset value is indicated through the activation DCI, the terminal can transmit the CSI corresponding to sub-configuration#0 through the slot corresponding to the k-th element of reportSlotOffsetList#0, and transmit the CSI corresponding to sub-configuration#1 through the slot corresponding to the k-th element of reportSlotOffsetList#1. As another example, if the reportSlotOffsetList parameter is set in sub-configuration#0 and a relative offset (e.g., 2 slots) is set in sub-configuration#1, and if the k-th offset value is indicated through the activation DCI, the terminal can transmit the CSI corresponding to sub-configuration#0 through the slot corresponding to the k-th element of reportSlotOffsetList (e.g., slot m), and transmit the CSI corresponding to sub-configuration#1 through slot m+2.

[0364] In the embodiments described above, the number N of opportunities and / or the positions of slots constituting each opportunity and / or the reporting cycle and / or the reporting offset, etc., may be changed by setting a plurality of candidate values ​​in advance and indicating one of the candidate values ​​through DCI or MAC CE. Here, the DCI may include UE-specific DCI, UE group-common DCI, or cell-common DCI.

[0365] In [Examples #1-2-1] to [Examples #1-2-5], for the purpose of reducing mismatch in CSI between the base station and the terminal, information indicating which CSI index information is carried in each opportunity may be included in the CSI report. For example, if CSI#2 information is carried in the second opportunity, the terminal may generate a CSI report including information related to the corresponding index #2 and transmit it to the base station. For example, information related to the CSI index may be included in CSI Part 1.

[0366] [Example #2] When a terminal includes CSI(s) corresponding to multiple AP count values ​​and / or multiple power offset values ​​for one CSI report, a method of setting at least one opportunity in which the corresponding CSI is included and controlling the amount of resources and / or included information items differently for each opportunity

[0367] In the aforementioned [Example #1], it was assumed that the time / frequency resources allocated to each opportunity were identical. However, by allocating a relatively large amount of time / frequency resources to specific opportunities that can carry a relatively large amount of CSI, it is possible to increase the stability of CSI reporting and provide more information to the base station.

[0368] FIG. 21 illustrates an example of a procedure for reporting CSIs for sub-configurations in multiple opportunities with different resource sizes according to one embodiment of the present disclosure. FIG. 21 illustrates a method performed by a terminal.

[0369] Referring to Figure 21, at step S2101, the terminal identifies the types of multiple opportunities. Here, the types are distinguished based on the amount of resources allocated for the corresponding opportunity (e.g., the number of REs / PRBs / OFDM symbols / carriers). That is, some opportunities may be configured with a relatively larger amount of resources than others. The types of opportunities can be directly or indirectly indicated / configured through configuration information for the opportunities, such as configuration information related to CSI reporting.

[0370] In step S2103, the terminal transmits a first CSI sub-report in a Type-1 opportunity. Compared to a Type-2 opportunity, the first CSI sub-report transmitted in a Type-1 opportunity may include information on more items or at least a portion of the information included in multiple CSIs. At this time, at least a portion of the information included in the first CSI sub-report may be transmitted in a compressed state.

[0371] In step S2105, the terminal transmits a second CSI sub-report in a Type-2 opportunity. The second CSI sub-report transmitted in a Type-2 opportunity may include information on fewer items or at least a portion of the information contained in a single CSI, compared to a Type-1 opportunity. For example, CSI sub-report transmission in a Type-2 opportunity may be performed more frequently than in a Type-1 opportunity. That is, one Type-1 opportunity and multiple Type-2 opportunities may form one cycle.

[0372] As described with reference to FIG. 21, CSIs can be transmitted in opportunities set with different amounts of resources. The present disclosure below describes embodiments of setting opportunities and utilizing the set opportunities.

[0373] For example, although the PUCCH / PUSCH resource allocated for P / SP-CSI reporting is 5 PRBs, it can be configured / instructed to allocate 10 PRBs for one opportunity every N periods or N opportunities. As another example, although the PUCCH / PUSCH resource allocated for P / SP-CSI reporting is 6 OFDM symbols, it can be configured / instructed to allocate 11 OFDM symbols for one opportunity every N periods or N opportunities. As another example, among the multiple PUSCH resources allocated for A-CSI reporting, 11 OFDM symbols can be allocated for a specific PUSCH, and 6 OFDM symbols can be allocated for the remaining PUSCH(s).

[0374] Alternatively, the amount of resources may be opportunistically changed during some intervals via DCI, group-common DCI, or MAC-CE. That is, the amount of resources for opportunities to temporarily transmit CSI may be changed during some intervals. For example, while the PUCCH / PUSCH resources allocated for P / SP-CSI reporting are 5 PRBs, the UE may be instructed to increase the amount of resources to 10 PRBs via DCI, group-common DCI, or MAC-CE. In this case, the increased amount of resources may be maintained until a separate instruction is given, or may be reduced back to 5 PRBs after a certain period of time.

[0375] As in the examples described above, a PUSCH / PUCCH with relatively many resources allocated (hereinafter referred to as 'Type 1 PUXCH', 'Type-1 uplink resources' or 'Type-1 opportunities') and a PUSCH / PUCCH with relatively few resources allocated (hereinafter referred to as 'Type 2 PUXCH', 'Type-2 uplink resources' or 'Type-2 opportunities') may be operated. In this case, the configuration method of CSI reporting may be different between Type 1 PUXCH and Type 2 PUXCH. In the following description, three CSIs (e.g., CSI#1 / 2 / 3) are described as corresponding to a single CSI report, but the embodiments described below may also be applied to a case where a different number of CSI(s) corresponds to a single CSI report.

[0376] In Type 1 PUXCH, information for all CSI#1 / 2 / 3 may be carried. Alternatively, information for all CSI#1 / 2 / 3 may be carried, but compressed information may be carried for each CSI or some CSI indices. For example, compression may be performed in a way that CSI is composed of only WB PMI and / or CQI without SB PMI and / or CQI, has different granularities for time domain / frequency domain / spatial domain basis, omits some information, or is composed of baseline values ​​and difference values. Alternatively, for beam management related reports such as L1-RSRP or L1-SINR, compression may be performed in a way that reduces the number of CRI / RSRP / SINR values ​​for each CSI index.

[0377] In Type 2 PUXCH, information can only be carried for specific CSI indices. Specific CSI indices can be predefined (e.g., the smallest CSI index, the largest CSI index, the smallest CSI sub-set index, the largest CSI sub-set index, etc.) or configured by higher-layer signaling. Alternatively, specific CSI indices can be configured differently on a per-option basis.

[0378] Meanwhile, Type 1 PUXCH can be implemented as a PUCCH for multi-CSI purposes. Specifically, if a PUCCH for multi-CSI (e.g., a PUCCH configured to transmit multiple CSI reports) exists within a PUCCH slot configured for P / SP-CSI reporting, the UE can use the PUCCH for multi-CSI as a container to transmit CSIs. In this case, the PUCCH for multi-CSI can mean Type 1 PUXCH. Here, the PUCCH configured to transmit multiple CSI reports can be used to transmit CSI per sub-configuration, as well as when it is configured for single CSI reporting.

[0379] Alternatively, the Type 1 PUXCH may be implemented as a CG (configured grant) or DG (dynamic grant) PUSCH. Specifically, if a PUSCH of the same carrier or a different carrier is allocated within a PUCCH slot configured for P / SP-CSI reporting, CSI reporting may be multiplexed through the PUSCH. In this case, the PUSCH may refer to a Type 1 PUXCH.

[0380] In this embodiment, to reduce CSI mismatch between the base station and the terminal, information indicating which CSI index is carried in each opportunity may be included in the CSI report. For example, for a Type 2 PUXCH, if CSI #2 is carried in a particular opportunity, the terminal may generate a CSI report including information related to index #2 and transmit it to the base station. For example, information related to the CSI index may be included in CSI Part 1.

[0381]

[0382] [Example #3] When WB reporting is set for PMI and / or CQI, a method of configuring CSI as a single CSI report without dividing it into Part 1 and Part 2.

[0383] [Table 13] below shows the definition of mapping for CSI fields in CSI reports extracted from document TS 38.212.

[0384]

[0385] As shown in [Table 13], one CSI report may include CRI, RI, LI, zero padding bits, WB PMI, WB CQI, etc. Here, the number of bits of LI, PMI, and / or CQI may vary depending on the combination of CRI / RI values ​​actually reported. If the number of bits of one CSI report is variable, a problem may arise in that the base station may not be able to properly decode the information of the CSI report. To solve this problem, by defining zero padding bits, the overall payload size of one CSI report can be maintained constant even if the CRI / RI values ​​vary.

[0386] The present disclosure proposes a technique for composing one CSI report when feeding back to a base station a CSI report including CSI(s) corresponding to N sub-configuration(s), which are 1 to L, among L sub-configurations for a certain CSI report#n, according to one of options#1 / 2 / 3.

[0387] In one embodiment, a method may be considered for generating a CSI report that includes information corresponding to all sub-settings for each CSI content. Specifically, the CSI may be configured as shown in [Table 14] below.

[0388] CSI Report Number CSI Field CSI Report #n CRI values ​​corresponding to N sub-configurations, if reported RI values ​​corresponding to N sub-configurations, if reported LI values ​​corresponding to N sub-configurations, if reported Zero padding bits, if needed "wideband information fields and ” values ​​corresponding to N sub-configurations, if reported "CQI for the first / second TB” values ​​corresponding to N sub-configurations, if reported

[0389]

[0390] At this time, the zero padding bits Op are the maximum payload N considering all rank combinations per sub-set allowed to be reported. max and payload N considering the actual reported sub-setting rank combinations. repoted can be defined as the difference between the maximum payload N. For example, max and payloadN repoted can be defined as shown in [Table 15] below.

[0391]

[0392] In one embodiment, a method may be considered for configuring CSI content corresponding to a single sub-setting, and then concatenating information corresponding to all sub-settings to construct the entire CSI. Specifically, the CSI may be constructed as shown in [Table 16] below. [Table 16] shows an example of a case composed of two sub-settings.

[0393] CSI Report Number CSI Field CSI Report #n Sub-Configuration #1 CRI as in Tables 6.3.1.1.2-3 / 4, if reported Rank Indicator as in Tables 6.3.1.1.2-3 / 4, if reported Layer Indicator as in Tables 6.3.1.1.2-3 / 4, if reported Zero padding bits O P , if neededPMI wideband information fields X1, from left to right as in Tables 6.3.1.1.2-1 / 2, if reportedPMI wideband information fields X2, from left to right as in Tables 6.3.1.1.2-1 / 2, or codebook index for 2 antenna ports according to Clause 5.2.2.2.1 in [6, TS38.214], if reportedWideband CQI for the first TB as in Tables 6.3.1.1.2-3 / 4, if reportedWideband CQI for the second TB as in Tables 6.3.1.1.2-3 / 4, if reported서브-설정#2CRI as in Tables 6.3.1.1.2-3 / 4, if reportedRank Indicator as in Tables 6.3.1.1.2-3 / 4, if reportedLayer Indicator as in Tables 6.3.1.1.2-3 / 4, if reportedZero padding bits O P ,if neededPMI wideband information fields X1, from left to right as in Tables 6.3.1.1.2-1 / 2,if reportedPMI wideband information fields the first TB as in Tables 6.3.1.1.2-3 / 4, if reportedWideband CQI for the second TB as in Tables 6.3.1.1.2-3 / 4, if reported

[0394]

[0395] FIG. 22 illustrates an example of a procedure for transmitting a CSI report based on sub-settings according to one embodiment of the present disclosure. FIG. 22 illustrates signal exchange between a terminal (2210) and a base station (2220).

[0396] Referring to FIG. 22, in step S2201, the base station (2220) transmits configuration information for CSI reporting settings to the terminal (2210). Here, the CSI reporting settings are associated with at least one number of APs and / or at least one power offset value.

[0397] In step S2203, the base station (2220) transmits configuration information for N opportunities per CSI reporting configuration to the terminal (2210). In other words, the base station (2220) configures multiple opportunities for a single CSI report. Here, each opportunity is used to transmit a single CSI sub-report. A CSI sub-report may correspond to a single sub-configuration or a combination of multiple sub-configurations.

[0398] In step S2205, the terminal (2210) calculates CSI values. Here, the CSI values ​​correspond to at least one AP number and / or at least one power offset value. In other words, CSIs corresponding to sub-configurations determined by the configured AP number(s) and / or configured power offset value(s) are calculated.

[0399] In step S2207, the terminal (2210) reports CSIs. The CSIs correspond to different AP numbers(s) and / or power offset values(s) and are transmitted in each opportunity. In one embodiment, one CSI may be transmitted in one opportunity. In another embodiment, a CSI sub-report formed by a combination of CSIs may be transmitted in one opportunity.

[0400]

[0401] 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).

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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 to a base station at least one CSI including a measurement result based on at least one CSI-RS related to the above CSI report, The above sub-settings are distinguished by at least one of the associated power offset or number of antenna ports, A first CSI sub-report determined based on at least one CSI is transmitted at a first opportunity among the occasions determined based on the configuration information, A method in which a second CSI sub-report determined based on at least one of the above CSIs is transmitted at a second opportunity among the above opportunities.

2. In claim 1, The above opportunities are included in slots belonging to multiple periods for P(periodic) / SP(semi-persistent) CSI reporting as indicated by the above configuration information.

3. In claim 1, The above opportunities are included in slots belonging to at least one cycle for P / SP CSI reporting as indicated by the above configuration information.

4. In claim 1, The above opportunities are included in a plurality of uplink slots indicated by an uplink grant for AP (aperiodic) CSI reporting indicated by the above configuration information.

5. In claim 1, The first CSI sub-report includes a first CSI corresponding to a first sub-setting among the sub-settings, A method wherein the second CSI sub-report includes a second CSI corresponding to a second sub-setting among the sub-settings.

6. In claim 1, The above first CSI sub-report includes common information of CSIs corresponding to the sub-settings, A method wherein the second CSI sub-report includes the remainder of the CSI corresponding to one of the sub-settings, excluding the common information.

7. In claim 1, The first CSI sub-report includes a baseline value of at least one item of CSIs corresponding to the sub-settings, A method wherein the second CSI sub-report comprises a differential value with respect to the baseline value of at least one item of CSI corresponding to one of the sub-settings.

8. In claim 1, The first CSI sub-report includes all items of the first CSI and at least one item of the remaining at least one CSI among the CSIs corresponding to the sub-settings, A method wherein the second CSI sub-report includes all items of the second CSI and at least one item of the remaining at least one CSI among the CSIs corresponding to the sub-settings.

9. In claim 1, The above first CSI sub-report includes compressed information of CSIs corresponding to the sub-settings, A method wherein the second CSI sub-report includes a first CSI among the CSIs corresponding to the sub-settings.

10. In claim 1, A method wherein the above configuration information includes a period parameter and an offset parameter indicating a slot containing resources for each of the sub-configurations.

11. In claim 1, The first uplink resource for the first CSI sub-report is set to a relatively larger amount than the second uplink resource for the second CSI sub-report, The above first CSI sub-report includes CSIs corresponding to the sub-settings or compressed information of the CSIs, A method wherein the second CSI sub-report includes a first CSI among the CSIs corresponding to the sub-settings.

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, configured to transmit to a base station at least one CSI including a measurement result based on at least one CSI-RS related to the above CSI report, The above sub-settings are distinguished by at least one of the associated power offset or number of antenna ports, A first CSI sub-report determined based on at least one CSI is transmitted at a first opportunity among the occasions determined based on the configuration information, A second CSI sub-report determined based on at least one of the above CSIs is transmitted by a terminal in a second opportunity among the above opportunities.

13. 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, Receive configuration information for a CSI (channel state information) report containing a list of multiple sub-configurations, configured to transmit to a base station at least one CSI including a measurement result based on at least one CSI-RS related to the above CSI report, The above sub-settings are distinguished by at least one of the associated power offset or number of antenna ports, A first CSI sub-report determined based on at least one CSI is transmitted at a first opportunity among the occasions determined based on the configuration information, A second CSI sub-report determined based on at least one of the above CSIs, wherein the communication device transmits at a second opportunity among the above opportunities.

14. 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: The above processor, Receive configuration information for a CSI (channel state information) report containing a list of multiple sub-configurations, Instructs the base station to transmit at least one CSI including a measurement result based on at least one CSI-RS related to the above CSI report, The above sub-settings are distinguished by at least one of the associated power offset or number of antenna ports, A first CSI sub-report determined based on at least one CSI is transmitted at a first opportunity among the occasions determined based on the configuration information, A computer-readable medium in which a second CSI sub-report determined based on at least one of the above CSIs is transmitted in a second opportunity among the above opportunities.

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