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

Abstract

The purpose of the present disclosure is to report channel state information (CSI) on the basis of sub-configurations in a wireless communication system, and a method performed by a terminal may comprise the steps of: receiving configuration information for a CSI report including at least one sub-configuration; identifying information related to an antenna port subset associated with the at least one sub-configuration; identifying rank to port mapping for non-precoding matrix indicator (PMI) feedback per sub-configuration; generating CSI for the at least one sub-configuration on the basis of a measurement result based on at least one CSI-RS related to the CSI report; and transmitting, to a base station, a CSI report including the CSI.

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 indicating a subset of antenna ports (APs) of sub-configurations in a wireless communication system.

[0006] The present disclosure relates to a device and method for reporting CSI based on an AP subset of sub-sets in a wireless communication system.

[0007] The present disclosure relates to a device and method for determining an AP subset by considering a code division multiplexing (CDM) group in a wireless communication system.

[0008] The present disclosure relates to a device and method for determining a mapping of ranks to APs in a wireless communication system.

[0009] The present disclosure relates to a device and method for determining a mapping of ranks to APs by considering a subset of APs in a sub-configuration in a wireless communication system.

[0010] The present disclosure relates to a device and method for re-indexing APs considering a subset of APs in a sub-configuration in a wireless communication system.

[0011] The present disclosure relates to a device and method for re-indexing APs based on bitmap information indicating a subset of APs of a sub-configuration in a wireless communication system.

[0012] The present disclosure relates to a device and method for determining a rank-specific AP set based on rank-specific AP set information for non-PMI (precoding matrix indicator) feedback included in a sub-setting in a wireless communication system.

[0013] The present disclosure relates to a device and method for determining a rank-specific AP set based on rank-specific AP set information for non-PMI feedback included in another sub-setting in a wireless communication system.

[0014] The present disclosure relates to a device and method for determining a rank-based AP set based on an index order of APs in a wireless communication system.

[0015] 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.

[0016] As an example of the present disclosure, a method performed by a terminal in a wireless communication system includes the steps of: receiving configuration information for a channel state information (CSI) report including at least one sub-configuration; identifying information related to a subset of antenna ports associated with the at least one sub-configuration; identifying rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-configuration; generating CSI for the at least one sub-configuration based on a measurement result based on at least one CSI-RS associated with the CSI report; and transmitting the CSI report including the CSI to a base station, wherein the CSI includes at least one of a rank indicator (RI) or channel quality information (CQI), and the RI or the CQI is calculated based on the rank to port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, wherein the antenna port indices are determined based on the rank to port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, and wherein the antenna port indices are determined based on a set of antenna ports. It can be determined by mapping the consecutive values ​​starting from the starting value of the index in ascending order of the index within.

[0017] 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 at least one sub-configuration, identify information related to an antenna port subset associated with the at least one sub-configuration, identify rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-configuration, generate CSI for the at least one sub-configuration based on a measurement result based on at least one CSI-RS associated with the CSI report, and transmit a CSI report including the CSI to a base station, wherein the CSI includes at least one of a rank indicator (RI) or a channel quality information (CQI), and the RI or the CQI is calculated based on the rank to port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, wherein The antenna port indices can be determined by mapping the antenna ports to consecutive values ​​starting from the starting value of the index, in ascending order of the index within the entire set.

[0018] 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 including: receiving configuration information for a channel state information (CSI) report including at least one sub-configuration; identifying information related to a subset of antenna ports associated with the at least one sub-configuration; identifying rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-configuration; generating CSI for the at least one sub-configuration based on a measurement result based on at least one CSI-RS associated with the CSI report; and transmitting a CSI report including the CSI to a base station, wherein the CSI includes at least one of a rank indicator (RI) or a channel quality information (CQI), and wherein the RI or the CQI is mapped to antenna ports included in the antenna port subset. The rank-to-port mapping is calculated based on the antenna port indices, wherein the antenna port indices can be determined by mapping the antenna ports to consecutive values ​​starting from a starting value of the index in ascending order of the index within the entire set.

[0019] 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 including at least one sub-configuration, identify information related to a subset of antenna ports associated with the at least one sub-configuration, identify rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-configuration, generate CSI for the at least one sub-configuration based on a measurement result based on at least one CSI-RS associated with the CSI report, and transmit the CSI report including the CSI to a base station, wherein the CSI includes at least one of a rank indicator (RI) or channel quality information (CQI), and the RI or the The CQI is calculated based on the rank-to-port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, wherein the antenna port indices can be determined by mapping the antenna ports to consecutive values ​​starting from a starting value of the index in ascending order of the index within the entire set.

[0020] 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.

[0021] The following effects may be achieved by embodiments based on the present disclosure.

[0022] According to the present disclosure, channel state information (CSI) feedback for a subset of antenna ports can be performed using an existing codebook.

[0023] 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.

[0024] Figure 1 illustrates an example of the structure of a wireless communication system applicable to the present disclosure.

[0025] FIG. 2 illustrates an example of a wireless device applicable to the present disclosure.

[0026] FIG. 3 illustrates an example of a frame structure in a wireless communication system applicable to the present disclosure.

[0027] FIG. 4 illustrates an example of a resource grid in a wireless communication system applicable to the present disclosure.

[0028] FIG. 5 illustrates an example of a physical resource block in a wireless communication system applicable to the present disclosure.

[0029] FIG. 6 illustrates an example of a slot structure in a wireless communication system applicable to the present disclosure.

[0030] 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.

[0031] FIG. 8 illustrates an example of mapping physical channels within a slot in a wireless communication system applicable to the present disclosure.

[0032] Figure 9 illustrates examples of beams that can be applied to the present disclosure.

[0033] FIG. 10 illustrates an example of a DL BM (downlink beam management) procedure using a synchronization signal block (SSB) applicable to the present disclosure.

[0034] 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.

[0035] FIG. 12 illustrates an example of a terminal reception beam determination procedure applicable to the present disclosure.

[0036] FIG. 13 illustrates an example of a transmission beam determination procedure of a base station applicable to the present disclosure.

[0037] Figure 14 illustrates an example of resource allocation in the time and frequency domains that can be applied to the present disclosure.

[0038] FIG. 15 illustrates an example of beam sweeping for UL BM (uplink beam management) using SRS (sounding reference signal) applicable to the present disclosure.

[0039] FIG. 16 illustrates an example of a UL BM procedure using SRS that can be applied to the present disclosure.

[0040] Figure 17 illustrates an example of an operation procedure of a base station supporting network energy saving (NES) technology applicable to the present disclosure.

[0041] FIG. 18 illustrates an example of a procedure for measuring and reporting channel state information (CSI) that can be applied to the present disclosure.

[0042] FIGS. 19A to 19C illustrate examples of states of antenna elements according to one embodiment of the present disclosure.

[0043] FIG. 20 illustrates examples of configuration information for CSI reporting according to various embodiments of the present disclosure.

[0044] FIGS. 21A to 21R illustrate examples of AP (antenna port) mapping of CSI-RS (reference signal) according to various patterns applicable to the present disclosure.

[0045] FIG. 22 illustrates an example of a port layout for configuring a MIMO (multiple input multiput output) codebook applicable to the present disclosure.

[0046] FIGS. 23a to 23m illustrate examples of port layouts according to various combinations of N1 and N2 applicable to the present disclosure.

[0047] FIGS. 24a to 24h illustrate examples of port layouts according to various combinations of Ng, N1, and N2 applicable to the present disclosure.

[0048] FIGS. 25A and 25B illustrate examples of port layouts for 8-port APs applicable to the present disclosure and variations of the port layouts for AP subsets.

[0049] FIG. 26 illustrates an example of a procedure for reporting CSIs for sub-settings according to one embodiment of the present disclosure.

[0050] FIG. 27 illustrates an example of a procedure for receiving CSIs for sub-settings according to one embodiment of the present disclosure.

[0051] FIG. 28a and FIG. 28b illustrate examples of AP mapping of CSI-RS based on on / off per CDM (code domain multiplexing) group according to one embodiment of the present disclosure.

[0052] FIG. 29a and FIG. 29b illustrate examples of AP mapping of CSI-RS and port layout based on frequency domain and time domain priority allocation according to one embodiment of the present disclosure.

[0053] FIGS. 30A to 30C illustrate examples of re-indexing results of APs according to one embodiment of the present disclosure.

[0054] FIG. 31 illustrates an example of a procedure for mapping APs based on a subset of APs in a sub-configuration according to one embodiment of the present disclosure.

[0055] FIG. 32 illustrates an example of a procedure for transmitting a CSI report based on sub-settings according to one embodiment of the present disclosure.

[0056] FIG. 33 illustrates an example of a procedure for reporting non-PMI based CSIs for sub-settings according to one embodiment of the present disclosure.

[0057] FIG. 34 illustrates an example of a procedure for receiving non-PMI based CSIs for sub-settings according to one embodiment of the present disclosure.

[0058] FIG. 35 illustrates an example of a procedure for determining a set of APs corresponding to each rank for non-PMI feedback based on a subset of APs of a sub-set according to one embodiment of the present disclosure.

[0059] FIG. 36 illustrates another example of a procedure for determining a set of APs corresponding to each rank for non-PMI feedback based on a subset of APs of a sub-set according to one embodiment of the present disclosure.

[0060] The following embodiments combine 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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).

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] Additionally, specific terms used in the embodiments of the present disclosure are provided to aid in understanding 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.

[0072] 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).

[0073] 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.

[0074] 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.

[0075] 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.

[0076] System General

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082]

[0083]

[0084] *Figure 2 illustrates an example of a wireless device applicable to the present disclosure.

[0085] 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).

[0086] 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.

[0087] 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.

[0088] 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 executed 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.

[0089] 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.

[0090] 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.

[0091] 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).

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] FIG. 3 illustrates a frame structure in a wireless communication system applicable to the present disclosure.

[0099] 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.

[0100] 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.

[0101] CP015 Normal 130 Normal 260 Normal, Extended 3120 Normal 4240 Normal

[0102] 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).

[0103] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing FR1410MHz - 7125MHz 15, 30, 60kHz FR224250MHz - 52600MHz 60, 120, 240kHz

[0104] 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.

[0105] [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.

[0106] 01410111420221440431480841416016

[0107] 212404

[0108] FIG. 3 is an example when μ=2 (SCS is 60 kHz), and 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 slot(s) 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 the NR system will be specifically examined. First, with respect to the antenna port, the antenna port is defined such that the channel through which a symbol on the antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. If the large-scale property 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, the two antenna ports can be said to have a QC / QCL (quasi co-located or quasi co-location) relationship. Here, the large-scale property includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0109] 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.

[0110]

[0111] FIG. 4 illustrates a resource grid in a wireless communication system applicable to the present disclosure.

[0112] 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.

[0113] Point A serves as a common reference point of the resource block grid and is obtained as follows.

[0114] - 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.

[0115] - absoluteFrequencyPointA represents the frequency-position of point A expressed as ARFCN (absolute radio-frequency channel number).

[0116] 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.

[0117]

[0118] 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.

[0119]

[0120] is a common resource block where BWP starts relative to common resource block 0.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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).

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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).

[0130] 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.

[0131] 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.

[0132] 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.

[0133]

[0134] FIG. 8 illustrates an example of mapping physical channels within a slot in a wireless communication system applicable to the present disclosure.

[0135] 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.

[0136] Downlink (DL) physical channel / signal

[0137] (1) PDSCH

[0138] 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).

[0139] (2) PDCCH

[0140] 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.

[0141] [Table 5] shows examples of DCI formats transmitted via PDCCH.

[0142] 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

[0143] 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 transmit dynamic slot format information (e.g., dynamic SFI) to the UE, and DCI format 2_1 is used to transmit downlink pre-emption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be transmitted to the UEs within a group through a group common PDCCH, which is a PDCCH transmitted to the UEs defined as a group. The PDCCH / DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or usage of the PDCCH. For example, if the PDCCH is for a specific UE, the CRC is masked with a C-RNTI (Cell-RNTI). If the PDCCH is for paging, the CRC is masked with a P-RNTI (Paging-RNTI).If the PDCCH is about system information (e.g., a System Information Block (SIB), the CRC is masked with the System Information RNTI (SI-RNTI). If the PDCCH is about a random access response, the CRC is masked with the Random Access-RNTI (RA-RNTI).

[0144] [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.

[0145] 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-SCHCS-RNTIConfigured scheduled unicast transmission(deactivation)N / ATPC(Transmit Power Control)-PUCCH-RNTIPUCCH power controlN / ATPC-PUSCH-RNTIPUSCH 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,

[0146] 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 by one OFDMA symbol and one (P)RB. The PDCCH is transmitted through a Control Resource Set (CORESET). A CORESET corresponds to a set of physical resources / parameters used to carry the PDCCH / DCI within the BWP. For example, a CORESET includes a set of REGs with a given numerology (e.g., SCS, CP length, etc.). A CORESET can be configured through system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. Examples of parameters / information used to configure a CORESET are as follows. One or more CORESETs are set for one terminal, and multiple CORESETs can overlap in the time / frequency domain.

[0147] - controlResourceSetId: Indicates the identification information (ID) of CORESET.

[0148] - 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.

[0149] - 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.

[0150] - cce-REG-MappingType: Indicates the CCE-to-REG mapping type. Interleaved and non-interleaved types are supported.

[0151] - precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0152] - 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.

[0153] - tci-PresentInDCI: Indicates whether the TCI field is included in the DCI.

[0154] - pdcch-DMRS-ScramblingID: Indicates information used to initialize the PDCCH DMRS scrambling sequence.

[0155] 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.

[0156] [Table 7] illustrates the PDCCH search space.

[0157] 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)

[0158] An SS set 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. - searchSpaceId: Indicates the ID of the SS set.

[0159] - controlResourceSetId: Indicates the CORESET associated with the SS set.

[0160] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period period (in slot units) and the PDCCH monitoring period offset (in slot units).

[0161] - 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.

[0162] - 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).

[0163] - searchSpaceType: Indicates whether the SS type is CSS or USS.

[0164] - DCI format: Indicates the DCI format of the PDCCH candidate.

[0165] 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.

[0166] Uplink (DL) physical channel / signal

[0167] (1) PUSCH

[0168] 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.

[0169] (2) PUCCH

[0170] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0171] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0172] - 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.

[0173] - 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).

[0174] [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.

[0175] 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)

[0176] (0) PUCCH Format 0 (PF0) - Supported UCI payload size: up to K bits (e.g. K = 2)

[0177] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g. X = 2)

[0178] - Transmission structure: Consists of only UCI signals without DM-RS, and transmits the UCI status by selecting and transmitting one of multiple sequences.

[0179] (1) PUCCH Format 1 (PF1)

[0180] - Supported UCI payload sizes: up to K bits (e.g. K = 2)

[0181] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g. Y = 4, Z = 14)

[0182] 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).

[0183] (2) PUCCH Format 2 (PF2)

[0184] - Supported UCI payload size: more than K bits (e.g. K = 2)

[0185] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g. X = 2)

[0186] - 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.

[0187] (3) PUCCH Format 3 (PF3)

[0188] - Supported UCI payload size: more than K bits (e.g. K = 2)

[0189] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g. Y = 4, Z = 14)

[0190] 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.

[0191] (4) PUCCH Format 4 (PF4)

[0192] - Supported UCI payload size: more than K bits (e.g. K = 2)

[0193] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g. Y = 4, Z = 14)

[0194] - 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.

[0195]

[0196] Beam Management (BM)

[0197] 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.

[0198] - Beam measurement: An operation in which a base station or UE measures the characteristics of a received beam-forming signal.

[0199] - Beam determination: An operation in which a base station or UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0200] - 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.

[0201] - Beam report: An operation in which a UE reports information about a beam-formed signal based on beam measurement.

[0202] 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).

[0203] Additionally, each BM procedure may include Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.

[0204]

[0205]

[0206] 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.

[0207] Here, beam reporting may include preferred DL RS ID(identifier)(s) and corresponding L1-RSRP (Reference Signal Received Power).

[0208] The above DL RS ID may be an SSBRI (SSB Resource Indicator) or a CRI (CSI-RS Resource Indicator).

[0209] 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.

[0210] 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.

[0211]

[0212] <SSB를 이용한 DL BM>

[0213] Figure 10 is a flowchart showing an example of a DL BM procedure using SSB.

[0214] The configuration for beam report using SSB is performed during CSI / beam configuration in RRC connected state (or RRC connected mode).

[0215] - The terminal receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList including SSB resources used for BM from the base station (S410).

[0216] [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.

[0217]

[0218] In [Table 9], the csi-SSB-ResourceSetList parameter indicates a list of SSB resources used for beam management and reporting in one 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. - The terminal receives an SSB resource from the base station based on the CSI-SSB-ResourceSetList (S420).

[0219] - 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).

[0220] 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.

[0221] 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.

[0222] 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.

[0223]

[0224] <CSI-RS를 이용한 DL BM>

[0225] 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.

[0226] 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)'.

[0227] 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.

[0228] (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.

[0229] 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.

[0230] 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'.

[0231] Referring to Fig. 11 (a) and Fig. 12, the terminal's Rx beam determination process will be examined.

[0232] Figure 12 is a flowchart showing an example of a terminal's reception beam determination process.

[0233] - 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'.

[0234] - 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).

[0235] - The terminal determines its own Rx beam (S630).

[0236] - 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)'.

[0237] That is, the terminal can omit the CSI report when repetition is set to 'ON'.

[0238] Referring to Fig. 11 (b) and Fig. 13, the Tx beam determination process of the base station is examined.

[0239] Figure 13 is a flowchart showing an example of a transmission beam determination process of a base station.

[0240] - 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.

[0241] - 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).

[0242] - The terminal selects (or determines) the best beam (S740)

[0243] - 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'.

[0244] 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.

[0245] Figure 14 shows an example of resource allocation in the time and frequency domains related to the operation of Figure 11.

[0246] 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.

[0247] <dl bm 관련 빔 지시 (beam indication)>

[0248] 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.

[0249] 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.

[0250] 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.

[0251] [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.

[0252]

[0253] 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.

[0254]

[0255] <QCL(Quasi-Co Location)>

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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:

[0262] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0263] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0264] - 'QCL-TypeC': {Doppler shift, average delay}

[0265] - 'QCL-TypeD': {Spatial Rx parameter}

[0266] 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.

[0267] 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'.

[0268]

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] Figure 16 is a flowchart showing an example of a UL BM procedure using SRS.

[0276] - 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).

[0277] 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.

[0278] The network can trigger the transmission of an SRS resource set using the configured aperiodicSRS-ResourceTrigger (L1 DCI).

[0279]

[0280] In Table 11, usage represents a higher layer parameter indicating whether an 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 setting 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. - The terminal determines a Tx beam for an 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. Additionally, SRS-SpatialRelationInfo may or may not be set for each SRS resource.

[0281] - 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).

[0282] More specifically, for P-SRS with 'SRS-ResourceConfigType' set to 'periodic':

[0283] 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

[0284] 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

[0285] 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.

[0286] Beam decision and transmission behavior similar to the above can be applied even when 'SRS-ResourceConfigType' is set to 'SP-SRS' or 'AP-SRS'.

[0287] - Additionally, the terminal may or may not receive feedback on SRS from the base station in the following three cases (S1040).

[0288] i) If Spatial_Relation_Info is set for all SRS resources in 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.

[0289] 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, in this case, the terminal sweeps the Tx beam, and corresponds to Fig. G(b).

[0290] 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.

[0291]

[0292] NES (network energy saving)

[0293] 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 providers. 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.

[0294]

[0295] According to the application of NES technology, the base station can perform operations such as controlling on / off for a certain duration in the time domain, controlling transmission / reception resources for UE-common or UE-specific signals / channels, changing the amount of frequency domain resources, controlling transmission power, or turning on / off antenna ports, transmission-reception points (TRPs), etc. in the spatial domain. Fig. 17 illustrates an example of an operation procedure of a base station supporting NES technology. Referring to Fig. 17, the base station identifies the NES solution(s) to be applied. The NES solution(s) may be related to control of signal transmission / reception (e.g., on / off), beam operation, handover procedure, channel measurement and reporting, etc. Which NES solution(s) to apply can be adaptively selected or predefined depending on the current situation (e.g., cell load level, characteristics of connected terminals, etc.). The base station, having identified the NES solution(s), performs signaling for the NES. The specific signaling procedure may vary depending on the identified NES solution(s). For example, the base station may transmit common information about the NES solution(s), transmit configuration information necessary for NES operation to at least one terminal, or transmit control information regarding the progress of the NES operation to at least one terminal. In addition, the base station may receive capability information related to the NES from at least one terminal. Thereafter, the base station performs operations for the NES. At this time, the base station may perform operations for the NES based on the previously performed signaling. That is, based on the system information, configuration information, and control information transmitted through the signaling, the base station may turn on / off the transmission / reception of a specific signal, turn on / off elements in the spatial domain, or adjust resources for the transmission / reception of a measurement signal.

[0296] 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.

[0297] · 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).

[0298] · Inter-system energy saving solution: NG-RAN nodes that own capacity booster cells can autonomously transition those cells to an inactive state.

[0299] · 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.

[0300] · 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.

[0301] · 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.

[0302] · 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.

[0303] · 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.

[0304] CSI Measurement and Reporting

[0305] Figure 18 illustrates an example of a procedure for CSI measurement and reporting.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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).

[0322] 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.

[0323] 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).

[0324] 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.

[0325] Specific embodiments of the present disclosure

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.).

[0330] A single CSI reporting configuration (e.g., CSI-ReportConfig) may include multiple sub-configurations based on different numbers of antenna ports or different values ​​of power offsets. Specifically, for a single CSI reporting configuration, CSI-RS resources or sets of CSI-RS resources with different numbers of APs may be associated, or multiple power offsets may be associated. Here, the power offset includes the powerControlOffset parameter, which is a power offset value between the PDSCH and the CSI-RS, or the powerControlOffsetSS parameter, which is a power offset value between the SSS and the CSI-RS. In this case, at least one of the following CSI frameworks may be introduced.

[0331] - 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.

[0332] - 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.

[0333] - 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.

[0334] For the CSI frameworks described above, the CSI reporting method can be defined through at least one of the following options.

[0335] - 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.

[0336] - 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.

[0337] - 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] The present disclosure proposes a method for configuring some or all CSI-RS resources within a single CSI-RS resource set to multiple AP numbers in CSI Framework #3. When the CSI-RS resources and the corresponding number of APs corresponding to each sub-configuration are determined through the proposed technology, when a CSI report including the corresponding sub-configuration is configured / instructed, CSI can be generated using the CSI-RS resources and the corresponding number of APs included in the corresponding sub-configuration.

[0344] Each sub-setting within the configuration for CSI reporting (e.g. CSI-ReportConfig) can be linked in the same manner as Alt#A-1 / B-1 / C-1, as described below.

[0345] * Alt#A-1) Information on whether the number of APs set for each CSI-RS resource is the entirety or a subset, and if a subset, information on which AP indices it consists of (hereinafter referred to as 'port subset indication') may be included. For example, for a CSI-ReportConfig configuration linked to a resource set consisting of 32-port CSI-RS resources, sub-configuration #1 may be linked to the entirety of 32 ports, and sub-configuration #2 may be linked to only 16 ports configured with even indices. Such a port subset indication may utilize signaling methods (e.g., bitmap) described in [Embodiment #2] described below.

[0346] * Alt#B-1) If the number of APs can be set in other parameters (e.g. codebookConfig) within each sub-configuration without a separate port subset directive, the number of APs set in the corresponding parameter can be linked, and the AP index that constitutes the corresponding number of APs can be defined in advance.

[0347] * Alt#C-1) A hybrid method of Alt#A-1 and Alt#B-1, where the number of APs is implicitly set through the Alt#B-1 method, and the AP indexes that configure the APs can be separately set within each sub-configuration. For example, K entries for configuring 16 ports out of 32-port resources can be configured in advance. That is, entry 1 can be configured with 16 ports indexed oddly, entry 2 with 16 ports indexed evenly, entry 3 with the upper 16 ports, entry 4 with the lower 16 ports, etc. Which entry among them is used to configure the ports can be configured through a separate parameter within the sub-configuration. As shown in Fig. 20, a single resource set is configured with only CSI-RS resources of the number of A1 APs, and through the port subset indicator, it can be configured so that all A1 APs are linked in sub-setting #1, and the number of A2 APs less than A1 is linked in sub-setting #2.

[0348] As in the aforementioned Framework #3, if there is a set of CSI-RS resources linked to a CMR or an IMR within a CSI reporting-related configuration (e.g., CSI-ReportConfig), some or all of the CSI-RS resource(s) within the CSI-RS resource set may be configured / indicated with multiple AP count values. For example, CSI-RS resource #1 belonging to the CSI-RS resource set may be configured with a maximum of 32 APs, and some of them may be configured / indicated to perform CSI reporting utilizing 16 and / or 8 AP(s). In this case, the present disclosure proposes a specific AP mapping scheme and a codebook construction scheme for CSI reporting corresponding to the corresponding CSI reporting-related configuration.

[0349]

[0350] AP mapping of CSI-RS

[0351] The following [Table 13] is the structure of the configuration information for CSI-RS resource mapping defined in the TS 38.331 standard document.

[0352]

[0353] The following [Table 14] is a table related to the location of CSI-RS within a slot defined in the TS 38.211 standard document.

[0354] RowPortsXDensity ρcdm-Type CDM group index jk'l'113noCDM(k0,l0),(k0+4,l0),(k0+8,l0)0,0,000211, 0.5noCDM(k0,l0)000321, 0.5fd-CDM2(k0,l0)00, 10441fd-CDM2(k0,l0),(k0+2,l0)0.10, 10541fd-CDM2(k0,l0),(k0+4,l0)0.10, 10681fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0)0,1,2,30, 10781fd-CDM2(k0,l0),(k1,l0),(k0,l0+1),(k1,l0+1)0,1,2,30, 10881cdm4-FD2-TD2(k0,l0),(k1,l0)0,10, 10, 19121fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k4,l0),(k5,l0)0,1,2,3,4,50, 1010121cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0)0,1,20, 10, 111161, 0.5fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k0,l0+1),(k1,l0+1),(k2,l0+1),(k3,l0+1)0,1,2,3,4,5,6,70, 1012161, 0.5cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0),(k3,l0)0,1,2,30, 10, 113241, 0.5fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k0,l0+1),(k1,l0+1),(k2,l0+1),(k0,l1), (k1,l1),(k2,l1),(k0,l1+1),(k1,l1+1),(k2,l1+1)0,1,2,3,4,5,6,7,8,9,10,110, 1014241, 0.5cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0),(k0,l1),(k1,l1),(k2,l1)0,1,2,3,4,50, 10, 115241, 0.5cdm8-FD2-TD4(k0,l0),(k1,l0),(k2,l0)0,1,20, 10, 1, 2, 316321, 0.5fd-CDM2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k0,l0+1),(k1,l0+1),(k2,l0+1),(k3,l0+1),(k0,l1),(k1,l1) ,(k2,l1),(k3,l1),(k0,l1+1),(k1,l1+1),(k2,l1+1),(k3,l1+1)0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,150, 1017321, 0.5cdm4-FD2-TD2(k0,l0),(k1,l0),(k2,l0),(k3,l0),(k0,l1),(k1,l1),(k2,l1),(k3,l1)0,1,2,3,4,5,6,70, 10, 118321, 0.5cdm8-FD2-TD4(k0,l0),(k1,l0),(k2,l0),(k3,l0)0,1,2,30,10,1, 2, 3.

[0355]

[0356] The AP mapping method of CSI-RS can be determined by a combination of the RRC parameters included in the configuration information of [Table 13] above and the table of [Table 14]. The current NR standard supports a total of 18 patterns (e.g., the first to the 18th rows in the table of [Table 14]). The AP mapping examples for each pattern are as follows, referring to the drawing.

[0357]

[0358] Figures 21a to 21r illustrate examples of AP mapping of CSI-RS according to various patterns applicable to the present disclosure. In Figures 21a to 21r, 0 to 13 on the horizontal axis of the grid structure represent OFDM symbol indices, respectively, and 0 to 11 on the vertical axis of the grid structure represent RE or subcarrier indices within one RB.

[0359] Fig. 21a illustrates an example of AP mapping of CSI-RS according to the first pattern. Fig. 21a illustrates a case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b3…b0] of the TS 38.211 specification) is set to 0010, i.e., the l0 value is set to 3 and the k0 value is set to 1. In Fig. 21a, CSI-RS AP number 3000 is mapped to REs indicated as ‘0’.

[0360] Figure 21b illustrates an example of AP mapping of CSI-RS according to the second pattern. Figure 21b illustrates that the firstOFDMSymbolInTimeDomain parameter is set to 3, and the frequencyDomainAllocation parameter (e.g., bitmap [b] of the TS 38.211 specification) is set to 3. 11 … b0]) is set to 0000 0000 0010, i.e., the l0 value is set to 3 and the k0 value is set to 1. In Fig. 21b, CSI-RS AP number 3000 is mapped to REs indicated as '0'.

[0361] Fig. 21c illustrates an example of AP mapping of CSI-RS according to the third pattern. Fig. 21c illustrates a case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 000010, i.e., the l0 value is set to 3 and the k0 value is set to 2. In Fig. 21c, two APs in the RE group (group) or CDM (code domain multiplexing) group indicated as '0' are CDMed by applying a frequency axis OCC (orthogonal cover code), and CSI-RS APs numbered 3000 and 3001 are mapped.

[0362] Fig. 21d illustrates an example of AP mapping of CSI-RS according to the fourth pattern. Fig. 21d illustrates a case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b2…b0] of the TS 38.211 specification) is set to 001, i.e., the l0 value is set to 3 and the k0 value is set to 0. In Fig. 21d, two APs are CDMed by applying the frequency axis OCC to each of the RE groups or CDM groups indicated as '0' or '1', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, and CSI-RS APs 3002 and 3003 are mapped to CDM group 1.

[0363] Fig. 21e illustrates an example of AP mapping of CSI-RS according to the fifth pattern. Fig. 21e illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 000010, i.e., the l0 value is set to 3 and the k0 value is set to 2. In Fig. 21e, two APs are CDMed by applying the frequency axis OCC to each of the RE groups or CDM groups indicated by '0' or '1', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, and CSI-RS APs 3002 and 3003 are mapped to CDM group 1.

[0364] Fig. 21f illustrates an example of AP mapping of CSI-RS according to the sixth pattern. Fig. 21f illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101101, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 4, 6, and 10, respectively. In FIG. 21f, two APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, and CSI-RS APs 3006 and 3007 are mapped to CDM group 3.

[0365] Fig. 21g illustrates an example of AP mapping of CSI-RS according to the seventh pattern. Fig. 21g illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 010001, i.e., the value of l0 is set to 3 and the values ​​of k0 and k1 are set to 0 and 8, respectively. In FIG. 21g, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, and CSI-RS APs 3006 and 3007 are mapped to CDM group 3.

[0366] Fig. 21h illustrates an example of AP mapping of CSI-RS according to the 8th pattern. Fig. 21h illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 010001, i.e., the value of l0 is set to 3, and the values ​​of k0 and k1 are set to 0 and 8, respectively. In Fig. 21h, four APs are CDMed by applying the frequency axis OCC to each of the RE groups or CDM groups indicated as '0' or '2', and accordingly, CSI-RS APs 3000 to 3003 are mapped to CDM group 0, and CSI-RS APs 3004 and 3007 are mapped to CDM group 1.

[0367] Fig. 21i illustrates an example of AP mapping of CSI-RS according to the 9th pattern. Fig. 21i illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 111111, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, k3, k4, and k5 are set to 0, 2, 4, 6, and 8, respectively. In FIG. 21i, two APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4' or '5', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5.

[0368] Fig. 21j illustrates an example of AP mapping of CSI-RS according to the 10th pattern. Fig. 21j illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 010101, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, and k2 are set to 0, 4, and 8, respectively. In FIG. 21j, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', or '2', and thus CSI-RS APs 3000 to 3003 are mapped to CDM group 0, CSI-RS APs 3004 to 3007 are mapped to CDM group 1, and CSI-RS APs 3008 to 3011 are mapped to CDM group 2.

[0369] Fig. 21k illustrates an example of AP mapping of CSI-RS according to the 11th pattern. Fig. 21k illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In FIG. 21k, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6' or '7', and thus CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5. CSI-RS APs 3012 and 3013 are mapped to CDM group 6, and CSI-RS APs 3014 and 3015 are mapped to CDM group 7.

[0370] Fig. 21l illustrates an example of AP mapping of CSI-RS according to the 12th pattern. Fig. 21l illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In FIG. 21l, four APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and accordingly, CSI-RS APs 3000 to 3003 are mapped to CDM group 0, CSI-RS APs 3004 to 3007 are mapped to CDM group 1, CSI-RS APs 3008 to 3011 are mapped to CDM group 2, and CSI-RS APs 3012 to 3015 are mapped to CDM group 3.

[0371] Fig. 21m illustrates an example of AP mapping of CSI-RS according to the 13th pattern. Fig. 21m illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 100011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, and k2 are set to 0, 8, and 10, respectively. In FIG. 21m, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10' or '11', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CDM group 5. CSI-RS APs 3010 and 3011 are mapped, CSI-RS APs 3012 and 3013 are mapped to CDM group 6, CSI-RS APs 3014 and 3015 are mapped to CDM group 7, CSI-RS APs 3016 and 3017 are mapped to CDM group 8, CSI-RS APs 3018 and 3019 are mapped to CDM group 9, CSI-RS APs 3020 and 3021 are mapped to CDM group 10, and CSI-RS APs 3022 and 3023 are mapped to CDM group 11.

[0372] Fig. 21n illustrates an example of AP mapping of CSI-RS according to the 14th pattern. Fig. 21n illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 100011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, and k2 are set to 0, 2, and 10, respectively. In FIG. 21n, four APs are CDMed by application of frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4' or '5', and thus CSI-RS APs 3000 to 3003 are mapped to CDM group 0, CSI-RS APs 3004 to 3007 are mapped to CDM group 1, CSI-RS APs 3008 to 3011 are mapped to CDM group 2, CSI-RS APs 3012 to 3015 are mapped to CDM group 3, CSI-RS APs 3016 to 3019 are mapped to CDM group 4, and CSI-RS APs 3020 to 3023 are mapped to CDM group 5.

[0373] Fig. 21o illustrates an example of AP mapping of CSI-RS according to the 15th pattern. Fig. 21o illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 001011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, and k2 are set to 0, 2, and 6, respectively. In FIG. 21o, eight APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', or '2', and accordingly, CSI-RS APs numbered 3000 to 3007 are mapped to CDM group 0, CSI-RS APs numbered 3008 to 3015 are mapped to CDM group 1, and CSI-RS APs numbered 3016 to 3023 are mapped to CDM group 2.

[0374] Fig. 21p illustrates an example of AP mapping of CSI-RS according to the 13th pattern. Fig. 21p illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively.In FIG. 21p, two APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14' or '15', and accordingly, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, and CSI-RS APs 3008 and 3009 are mapped to CDM group 4. CSI-RS APs 3009 are mapped, CSI-RS APs 3010 and 3011 are mapped to CDM group 5, CSI-RS APs 3012 and 3013 are mapped to CDM group 6, CSI-RS APs 3014 and 3015 are mapped to CDM group 7, CSI-RS APs 3016 and 3017 are mapped to CDM group 8, CSI-RS APs 3018 and 3019 are mapped to CDM group 9, CSI-RS APs 3020 and 3021 are mapped to CDM group 10, CSI-RS APs 3022 and 3023 are mapped to CDM group 11, and CSI-RS APs 3024 and 3025 are mapped to CDM group 12. APs are mapped, CSI-RS APs 3026 and 3027 are mapped to CDM group 13, CSI-RS APs 3028 and 3029 are mapped to CDM group 14, and CSI-RS APs 3030 and 3031 are mapped to CDM group 15.

[0375] Fig. 21q illustrates an example of AP mapping of CSI-RS according to the 14th pattern. Fig. 21q illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 110011, i.e., the value of l0 is set to 3, the value of l1 is set to 10, and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 8, and 10, respectively. In FIG. 21q, four APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2', '3', '4', '5', '6' or '7', and thus CSI-RS APs no. 3000 to 3003 are mapped to CDM group no. 0, CSI-RS APs no. 3004 to 3007 are mapped to CDM group no. 1, CSI-RS APs no. 3008 to 3011 are mapped to CDM group no. 2, CSI-RS APs no. 3012 to 3015 are mapped to CDM group no. 3, CSI-RS APs no. 3016 to 3019 are mapped to CDM group no. 4, and CSI-RS APs no. 3020 to 3023 are mapped to CDM group no. 5. CSI-RS APs numbered 3024 to 3027 are mapped to CDM group 6, and CSI-RS APs numbered 3028 to 3031 are mapped to CDM group 7.

[0376] Fig. 21r illustrates an example of AP mapping of CSI-RS according to the 15th pattern. Fig. 21r illustrates a case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., a parameter corresponding to the bitmap [b5…b0] of the TS 38.211 specification) is set to 101011, i.e., the value of l0 is set to 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In FIG. 21r, eight APs are CDMed by applying frequency axis OCC to each of RE groups or CDM groups indicated as '0', '1', '2' or '3', and accordingly, CSI-RS APs 3000 to 3007 are mapped to CDM group 0, CSI-RS APs 3008 to 3015 are mapped to CDM group 1, CSI-RS APs 3016 to 3023 are mapped to CDM group 2, and CSI-RS APs 3024 to 3031 are mapped to CDM group 3.

[0377] Port layout for codebook configuration

[0378] One of the pieces of information that constitutes CSI feedback in an NR system is the precoder matrix index (PMI). To define the PMI, various types of codebooks are supported. Specifically, Type I single-panel codebooks, Type I multi-panel codebooks, Type II codebooks, enhanced Type II codebooks, Type II port selection codebooks, and further enhanced or enhanced Type II port selection codebooks may be supported. Type 1 codebooks are designed for single-user MIMO, and Type 2 codebooks are designed for multi-user MIMO transmission. In configuring the MIMO codebook, the assumed port layout is the (N1, N2) structure as shown in FIG. 22. FIG. 22 illustrates an example of a port layout for configuring a MIMO codebook applicable to the present disclosure. In the case of a base station having a plurality of Ng panels. For each panel, the (N1, N2) structure as in Fig. 22 will be repeated. Meanwhile, the number of APs of CSI-RS in the (N1, N2) structure or the (Ng, N1, N2) structure is 2×N1×N2 or 2×Ng×N1×N2. For example, the number of CSI-RS APs in the port layout of (N1, N2)=(4,2) can be 16.

[0379] Specifically, the NR standard (e.g., TS 38.214, 5.2.2.2.1) defines combinations of (N1, N2) for a single panel as shown in [Table 15] below. O1 and O2 in the tables below are oversampling factors.

[0380] Number of CSI-RSantenna ports, P CSI-RS (N1,N2)(O1,O2)4(2,1)(4,1)8(2,2)(4,4)(4,1)(4,1)12(3,2)(4,4)(6,1)(4,1)16(4,2)(4, 4)(8,1)(4,1)24(4,3)(4,4)(6,2)(4,4)(12,1)(4,1)32(4,4)(4,4)(8,2)(4,4)(16,1)(4,1)

[0381] FIGS. 23a to 23m illustrate examples of port layouts according to various combinations of N1 and N2 applicable to the present disclosure. Fig. 23a is (N1, N2)=(2,1), Fig. 23b is (N1, N2)=(2,2), Fig. 23c is (N1, N2)=(4,1), Fig. 23d is (N1, N2)=(3,2), Fig. 23e is (N1, N2)=(6,1), Fig. 23f is (N1, N2)=(4,2), Fig. 23g is (N1, N2)=(8,1), Fig. 23h is (N1, N2)=(4,3), Fig. 23i is (N1, N2)=(6,2), Fig. 23j is (N1, N2)=(12,1), Fig. 23k is (N1, N2)=(4,4), Fig. 23l is (N1, N2)=(8,2), Fig. 23m is Port mapping for the case where (N1, N2) = (16, 1) is illustrated. Referring to FIGS. 23a to 23m, port layouts are defined for the case where N1 is equal to or greater than N2. Port number X can correspond to port index 3000+X.

[0382] Additionally, for the case of multiple panels in the NR standard (e.g. TS 38.214, 5.2.2.2.2), combinations of (Ng, N1, N2) are defined as shown in [Table 16] below.

[0383] Number of CSI-RSantenna ports, P CSI-RS (N g ,N1,N2)(O1,O2)8(2,2,1)(4,1)16(2,4,1)(4,1)(4,2,1)(4,1)(2,2,2)(4,4)32(2,8,1)(4,1)(4,4,1)(4,1)(2,4,2)(4,4)(4,2,2)(4,4)

[0384]

[0385] FIGS. 24A to 24H illustrate examples of port layouts according to various combinations of Ng, N1, and N2 applicable to the present disclosure. FIG. 24A illustrates port mapping for the case where (Ng, N1, N2)=(2,2,1), FIG. 24B illustrates port mapping for the case where (Ng, N1, N2)=(2,4,1), FIG. 24C illustrates port mapping for the case where (Ng, N1, N2)=(4,2,1), FIG. 24D illustrates port mapping for the case where (Ng, N1, N2)=(2,2,2), FIG. 24E illustrates port mapping for the case where (Ng, N1, N2)=(2,8,1), FIG. 24F illustrates port mapping for the case where (Ng, N1, N2)=(4,4,1), FIG. 24G illustrates port mapping for the case where (Ng, N1, N2)=(2,4,2), and FIG. 24H illustrates port mapping for the case where (Ng, N1, N2)=(4,2,2). Port number X can correspond to port index 3000+X.

[0386]

[0387] According to the aforementioned CSI frameworks, particularly Framework #3, when the configuration information for CSI reporting (e.g., CSI-ReportConfig) includes a set of CSI-RS resources linked to one CMR or one IMR, some or all of the CSI-RS resource(s) within the set may be configured with multiple AP count values ​​and / or power offset values, etc. In this case, one CSI-RS resource is configured with at most N1 (e.g., N1=32) APs, and some of them are N2 ( <N1)개의 AP(들)(예: N2=16 또는 8)를 활용한 CSI 보고가 설정될 수 있다. 이러한 상황에서, 본 개시는 먼저 N1개의 AP들 중 어떤 N2개 또는 N1개를 활용한 CSI 보고인지를 설정 / 지시하는 기술을 제안하고자 한다.

[0388]

[0389] FIGS. 25A and 25B illustrate examples of port layouts for 8-port APs applicable to the present disclosure and variations of the port layouts for AP subsets. For example, as in FIG. 21G, if an 8-port CSI-RS is configured and (N1, N2) = (2, 2), a port layout such as that in FIG. 25A may be applied. If APs corresponding to CDM group #1 and CDM group #3 among the CSI-RSs are muted and CSI reporting can be configured for the remaining four APs, the port layouts corresponding to the remaining four APs may be as in FIG. 25B. However, since such a port layout is not defined in the table for current codebook configuration (e.g., [Table 15]), it may be difficult to configure a codebook for calculating PMI using the remaining four APs.

[0390]

[0391] Accordingly, the present disclosure proposes embodiments for CSI-RS AP mapping and efficient codebook configuration to support PMI reporting when configuring CSI reporting by muting some CSI-RS APs.

[0392] Hereinafter, in the present disclosure, ' / ' means 'and', 'or', or 'and / or', depending on the context. In addition, in the following description, the expression 'AP transmits' can be understood as 'a signal (e.g., CSI-RS) from a corresponding resource is transmitted through the AP', 'the AP is used to transmit a signal from the corresponding resource', etc.

[0393]

[0394] FIG. 26 illustrates an example of a procedure for reporting CSIs for sub-configurations according to one embodiment of the present disclosure. FIG. 26 illustrates a method performed by a terminal.

[0395] Referring to FIG. 26, in step S2601, 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 reporting. In addition, the configuration information may include multiple sub-configurations, and the sub-configurations may be related to at least one of different AP number values, AP subsets, or power offset values.

[0396] In step S2603, the terminal checks AP subset information for each sub-configuration. The configuration information received from the base station may include AP subset information for each sub-configuration. Specifically, the configuration information received from the base station may include a list of multiple sub-configurations, and the sub-configurations may include different AP subsets. That is, the sub-configurations may be associated with information about the AP subsets. Accordingly, the terminal may use bitmap information to check the AP subset applied to the corresponding sub-configuration, i.e., the index of the AP(s) that are turned on and / or the index of the AP(s) that are turned off. For example, the AP subset may be expressed in the form of a bitmap.

[0397] In step S2605, the terminal generates CSIs based on AP subsets. Here, the CSI may include a precoding matrix indicator (PMI). To determine the PMI, a codebook selection is required, and the codebook is selected based on the AP layout. Accordingly, the terminal may determine the AP layout of the AP subset based on established or predefined rules, select a codebook based on the determined layout, and determine the PMI based on the selected codebook. To this end, although not illustrated in FIG. 26, the terminal may obtain or confirm restriction information on codebook-related parameters (e.g., N1, N2, Ng, etc.) corresponding to the AP subset. In addition, although not illustrated in FIG. 26, the terminal may receive at least one CSI-RS through CSI-RS resources linked to configuration information for CSI reporting, measure a channel or interference using the received at least one CSI-RS, and determine the PMI based on the measurement result and the codebook. Accordingly, the terminal can generate CSIs including sub-setting-specific PMIs.

[0398] In step S2607, the terminal transmits a CSI report containing CSIs. In other words, the terminal feeds back CSIs for each sub-configuration to the base station. That is, the terminal transmits the CSI report using the resources indicated by the configuration information for the CSI report. Here, the CSI report may be transmitted via a single message or multiple messages.

[0399]

[0400] FIG. 27 illustrates an example of a procedure for receiving CSIs for sub-configurations according to one embodiment of the present disclosure. FIG. 27 illustrates a method performed by a base station.

[0401] Referring to FIG. 27, in step S2701, the base station generates AP subset information for each sub-configuration. In providing configurations related to CSI reporting, the base station may provide multiple sub-configurations for one CSI-RS resource or a set of CSI-RS resources. In this case, the sub-configurations may be distinguished by at least one of the number of APs, AP subsets, and power offsets. For example, the base station may generate AP subset information for each sub-configuration that expresses the AP subset in the form of a bitmap.

[0402] In step S2703, the terminal transmits 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 at least one of different AP number values, AP subsets, or power offset values. In this case, the configuration information may include AP subset information for each sub-configuration generated in step S2701.

[0403] In step S2705, the terminal generates CSIs based on AP subsets. Here, the CSI may include a precoding matrix indicator (PMI). To determine the PMI, a codebook selection is required, and the codebook is selected based on the AP layout. Accordingly, the terminal may determine the AP layout of the AP subset based on configured or predefined rules, select a codebook based on the determined layout, and determine the PMI based on the selected codebook. To this end, although not illustrated in FIG. 27, the terminal may receive at least one CSI-RS through CSI-RS resources linked to configuration information for CSI reporting, measure a channel or interference using the received at least one CSI-RS, and determine the PMI based on the measurement result and the codebook. Accordingly, the terminal may generate CSIs including PMIs for each subset.

[0404] In step S2705, the base station receives a CSI report containing CSIs generated based on AP subsets. In other words, the base station receives CSIs for each subset from the terminal.

[0405] To this end, although not illustrated in FIG. 27, the base station may transmit at least one CSI-RS through CSI-RS resources linked to configuration information for CSI reporting. Furthermore, the base station may receive a CSI report using resources indicated by the configuration information for the CSI report. Here, each CSI may include a PMI. To interpret the PMI, a codebook selection is required, and the codebook is selected based on the AP layout. Accordingly, the base station may determine the AP layout of a subset of APs based on established or predefined rules, select a codebook based on the determined layout, and interpret the PMI based on the selected codebook.

[0406]

[0407] As described with reference to FIGS. 26 and 27, CSIs can be generated and transmitted for sub-sets associated with an AP subset. The present disclosure below proposes embodiments applicable to the procedure illustrated in FIG. 26, including signaling for AP subsets, CSI generation based on AP subsets, and the like.

[0408]

[0409] [Example #1] Signaling method for on / off, AP muting pattern, or port subset indication for a base station's AP

[0410] The present embodiment relates to a technology for saving energy at a base station by controlling the on / off of some of the N1 APs in a CSI-RS resource or CSI-RS resource set consisting of N1 APs. Specifically, at least one of the following instruction methods may be performed via DCI and / or MAC CE.

[0411] In addition, upon receiving a DCI or MAC CE indicating switching between groups, between configuration indices, between bitmap information, between the number of APs, or directly indicating bitmap information, and after an application delay of a certain period of time, the terminal may perform the indicated switching operation. For example, from the time of receiving the DCI or MAC CE, the terminal may perform the indicated switching operation at a time point after K1 symbol, slot, or msec, which is predefined / configured or reported by UE capability signaling, or from the nearest slot or slot-group boundary thereafter. As another example, from the time of receiving the MAC CE or DCI and transmitting the corresponding HARQ-ACK feedback, the terminal may perform the indicated switching operation at a time point after K2 msec, symbol, or slot, which is predefined / configured or reported by UE capability signaling, or from the nearest slot or slot-group boundary thereafter.

[0412] In addition to the signaling described below, a timer / duration and / or a pattern indicator may be configured / indicated via DCI and / or MAC CE, or according to a preset configuration / definition, for how long the instruction will be applied. For example, with respect to the timer / duration, the instruction may be applied during T2 slots after T1 slot from a reference time such as a DCI reception or a HARQ-ACK corresponding to the MAC CE, thereby indicating that fewer than N1 APs are used for transmission, and then N1 APs are used for transmission thereafter. For example, with respect to the pattern indicator, the instruction may be applied during T2 slots so that fewer than N1 APs are used for transmission, and then N1 APs are used for transmission during T3 slots, such that a T2 / T3 slot pattern is repeated. As another example, with respect to the time axis pattern indicator, N1 APs may be used for transmission in even index slots, and fewer than N1 AP(s) may be used for transmission in odd index slots.

[0413] (1) On / off for each AP or AP group can be indicated through a bitmap. For example, on / off for each AP can be controlled through a bitmap of N1 bits. As another example, considering the signaling overhead, X( <N1)-비트 비트맵을 통해 AP들의 온 / 오프가 제어될 수 있고, 각 비트에 연동되는 AP(들)의 인덱스는 사전에 설정되거나 또는 규칙에 의해 결정될 수 있다. 예를 들어, 사전 설정 또는 규칙에 따라, X=2 인 경우, 첫 번째 비트는 짝수 인덱스, 두 번째 비트는 홀수 인덱스에 맵핑될 수 있다. 다른 예로, 사전 설정 또는 규칙에 다라, 첫 번째 비트는 {N1 / 2} 이하의 AP들, 두 번째 비트는 그 외의 AP들애 맵핑될 수 있다.

[0414] Each bit of the X-bit bitmap may correspond to one CDM group or multiple CDM groups as exemplified in FIGS. 21a to 21r described above. For example, as in FIG. 21g, when an 8-port CSI-RS is configured, the bitmap may be composed of 4 bits, and each bit may be linked to one of the 4 CDM groups. When the bitmap information is set to '1010', the terminal may assume that the AP indices 3000 / 3001 / 3004 / 3005 belonging to CDM groups 0 / 2 are in the ON state and the AP indices 3002 / 3003 / 3006 / 3007 belonging to CDM groups 1 / 3 are in the OFF state, and transmit CSI reports for the APs in the ON state.

[0415] (2) On / off can be indicated through an N3-bit field, and for each code-point exceeding 2^(N3) or 2^(N3-1) and less than or equal to 2^(N3), which index of AP(s) is to be turned on / off can be preset. In other words, on / off information of K APs or information on which AP indices are to be used to configure CSI reporting may be preset, and AP index(es) required for on / off or configuration related to CSI reporting may be indicated through a field consisting of ceiling{log2(K)} bits. Alternatively, on / off information of K APs or information on which AP indices are to be used to configure CSI reporting may be preset, and AP index(es) required for on / off or configuration related to CSI reporting may be indicated through a field consisting of a K-bit bitmap. Here, the AP index(es) required for configuration related to on / off information or CSI reporting for K APs are specifically N1 (e.g., the number or maximum number of APs of corresponding CSI-RS) or X( <N1) 비트의 비트맵 정보를 포함할 수 있다.

[0416] Meanwhile, N1-bit or X-bit bitmap information is used in the corresponding N1-port CSI-RS resource configuration, N2( <N1)-포트(들)이 추가로 설정될 때, 각 N2-포트 정보에 N1-비트 또는 X-비트 비트맵 정보가 대응될 수 있다. 예를 들어, 상기 도 21g와 같이, 8-포트 CSI-RS가 설정되면, 해당 비트맵은 4-비트로 구성되어 각 비트는 4개의 CDM 그룹들 중 하나에 링크될 수 있다. 추가적으로, 4개 AP들 및 2개 AP들이라는 AP 개수가 해당 CSI-RS 자원 또는 CSI-RS 자원 세트 설정에 추가되면, 4-포트인 경우 '1010'의 비트맵 정보가 링크되고, 2-포트인 경우 '1000'의 비트맵 정보가 링크될 수 있다. 다른 예로, 도 21g와 같이, 8-포트 CSI-RS가 설정되면, 해당 비트맵은 4 비트들로 구성되고, 각 비트는 4개의 CDM 그룹들 중 하나에 링크될 수 있다. 이 경우, '1111' 비트맵 정보에 추가로, 4-포트를 의미하는 '1010', 2-포트를 의미하는 '1000'의 비트맵 정보가 사전에 해당 CSI-RS 자원 설정 또는 CSI-RS 자원 세트 설정 내에 설정될 수 있다. 따라서, DCI 또는 MAC-CE를 통해 2-비트 필드 또는 3-비트 비트맵 필드를 활용하여, 8-포트, 4-포트, 2-포트 중 몇 개의 AP에 대응되는 CSI 보고를 송신할지 또는 '1111', '1010' 또는 '1000' 중 어떤 비트맵 정보를 적용함으로써, 대응되는 CSI 보고를 송신할지가 지시될 수 있다.

[0417] If at least one sub-configuration can be set for a setting related to CSI reporting, the signaling methods described above can be utilized for port subset indication. As in the example of FIG. 20, sub-configuration #1 can be linked to the number of A1 APs, and sub-configuration #2 can be linked to the number of A2 APs. In this case, a bitmap (e.g., a 32-bit bitmap or an X-bit bitmap, where each bit is mapped to one or more AP indices according to a predetermined rule) can be set for each sub-configuration for the port subset indication of sub-configuration #1 / sub-configuration #2.

[0418] Alternatively, the port subset indication for each sub-configuration can be expressed through Y-bit information, and for each code point greater than 2^(Y) or 2^(Y-1) and less than or equal to 2^(Y), which index of AP(s) is turned on / off can be preset or predefined in the specification. Here, the Y-bit information can include both Alt1) AP count and indexing information, or Alt2) only indexing information can be included, and separate information can be configured for each AP count. For Alt2, for example, Y1-bit information for 16 ports and Y2-bit information for 8 ports can be preset or predefined in the specification. For sub-configuration #n, if the terminal can recognize that the corresponding AP count is 16 through another parameter (e.g. codebookConfig), by additionally setting Y1-bit information in the corresponding sub-configuration, the terminal can know which 16 APs are turned on. Similarly, for sub-configuration #k, if the terminal can recognize that the corresponding number of APs is 8 through other parameters (e.g. codebookConfig), by additionally setting Y2-bit information in the corresponding sub-configuration, the terminal can know which 8 APs are turned on.

[0419] In the above-described methods, the turning on of specific APs may mean that the UE reports only the corresponding CSI (e.g., RI, PMI, CQI, etc.) information for the APs that are turned on when performing CSI reporting. To this end, the configuration of codebook-related configuration information (e.g., codebookConfig) corresponding to the corresponding CSI-RS resource or CSI-RS resource set may need to be individually configured for all candidates for the number of APs that can be turned on. For example, as a certain number of APs are turned on and off in the above-described method, three different codebookConfigs may be individually configured for the corresponding CSI-RS resource or CSI-RS resource set for which N1, N2, or N3 AP(s) can be turned on, which means that the codebook subset restriction and / or RI restriction may be set differently for each number of APs. Accordingly, when the terminal receives a signaling that only N2 APs are turned on for the corresponding CSI-RS resource or CSI-RS resource set according to an instruction according to the proposed technology, the terminal may calculate CSI corresponding to the corresponding CSI-RS resource or CSI-RS resource set based on the codebookConfig settings corresponding to the corresponding N2 APs, and report the calculated CSI information to the base station. Information indicating how many APs the CSI report corresponds to may be included in the corresponding CSI information, particularly in the CSI part 1 information, and the information may be the aforementioned bitmap information or may indicate which of K preset AP on / off information (e.g., AP number information, bitmap information, etc.) it is set to.

[0420] This embodiment #1 relates to on / off signaling for an AP, but can also be extended to on / off signaling for a panel or TRP.

[0421]

[0422] [Example #2] CSI-RS resource configuration method according to on / off, muting pattern, or port subset instructions for AP of base station

[0423] If only some of the APs in a CDM group are turned off, CSI-RS resources may be reduced based on the number of OCCs corresponding to the turned-on APs and the time / frequency dimensions. [Table 17] shows the CSI-RS resource mapping extracted from the TS 38.211 v17.4.0 specification document.

[0424]

[0425]

[0426] In [Table 17], the order of AP indexes within one CDM group is determined by the sequence index s, as confirmed by the formula for determining the AP index p, i.e., p=3000+s+j×L, and the order of the sequence index s is determined by Tables 7.4.1.5.3-2 to 7.4.1.5.3-5 of [Table 17].

[0427] For example, as in the above-described FIG. 21q, when cdm4-FD2-TD2 is applied to a 32-port CSI-RS, AP indices 3000 / 3001 / 3002 / 3003 transmitted to CDM group #0 may correspond to indices 0 / 1 / 2 / 3 of Table 7.4.1.5.3-4 of [Table 17], respectively. If AP indices 3002 / 3003 are turned off and AP indices 3000 / 3001 are turned on, or conversely, AP indices 3002 / 3003 are turned on and AP indices 3000 / 3001 are turned off, the time-axis OCCs are the same, and only the frequency-axis OCCs are orthogonal. In this case, the time-axis resource corresponding to the corresponding CDM group #0 may be sufficient with only 1 symbol, not 2 symbols. By utilizing this, if AP index n+2 / n+3 among AP indexes n / n+1 / n+2 / n+3 existing in one CDM group is turned off and AP index n / n+1 is turned on, or conversely, if AP index n+2 / n+3 among AP indexes n / n+1 / n+2 / n+3 is turned on and AP index n / n+1 is turned off, two symbols of the time axis resource corresponding to the corresponding CDM group can be replaced with one symbol. FIG. 28A and FIG. 28B illustrate examples of AP mapping of CSI-RS based on on / off for each CDM group according to an embodiment of the present disclosure. As in FIG. 28A, the base station can transmit the CSI-RS composed of the remaining 16 ports through two symbols such as symbol #3 and symbol #10, and the terminal can transmit the CSI report. Alternatively, to minimize the time that the base station turns on the RF for CSI-RS transmission, the interval between transmission symbols can be narrowed, so that the base station can transmit the CSI-RS consisting of the remaining 16 ports through two symbols, such as symbol #3 and symbol #4, as shown in FIG. 28b, and the terminal can transmit the CSI report.

[0428] As described above, the method of abbreviating some of the time-axis and / or frequency-axis resources of the CDM group by utilizing the OCC characteristics of the remaining CSI-RS ports within the same CDM group can be applied to other AP numbers and / or other CDM types. For example, when fd-CDM2 is applied, if one of the AP indices n / n+1 existing in a CDM group is turned off, only one of the two REs corresponding to the CDM group may transmit the AP that is in the turned-on state, and the remaining REs may not have CSI-RS APs mapped. As another example, when cdm8-FD2-TD4 is applied, if AP index n+4 / n+5 / n+6 / n+7 among AP indexes n / n+1 / n+2 / n+3 / n+4 / n+5 / n+6 / n+7 existing in one CDM group is turned off and AP index n / n+1 / n+2 / n+3 is turned on, APs that are turned on may be transmitted in two symbols among four symbols corresponding to the CDM group, and CSI-RS APs may not be mapped in the remaining symbols.

[0429] As described above, only some APs within a CDM group may be turned off, but there may also be cases where all APs within a CDM group are turned off. As described above, even if only some APs are turned off, if there is a change in the time / frequency resources corresponding to the CDM group or the entire CDM group is turned off, and the resources allocated to the CDM group are not used for CSI-RS, using the remaining resources for other DL transmissions (e.g., PDSCH transmission) from the base station's perspective may contribute to increasing system efficiency. To efficiently implement this, a separate set of rate matching pattern(s) may be linked according to the CSI-RS muting pattern or AP on / off pattern. For example, if information related to K AP on / off patterns or information related to which AP indices are used to configure CSI reporting can be preset as in [Example #1], a set of rate matching pattern(s) corresponding to each pattern or each combination of indices may be linked. If K=2, a set #1 of rate matching patterns corresponding to information related to the first AP on / off pattern may be set, and a set #2 of rate matching patterns corresponding to information related to the second AP on / off pattern may be set. If information related to the first AP on / off pattern is indicated through DCI or MAC-CE, the terminal may assume that the rate matching pattern included in set #1 is valid and receive the PDSCH. At this time, for the REs indicated as the rate matching pattern, the terminal may determine that the REs are not available for PDSCH reception when receiving the PDSCH. In addition, the validity of the rate matching pattern included in a specific set means that if the rate matching pattern is set only by RRC signaling, the terminal may consider the pattern for PDSCH reception.Alternatively, if the rate matching patterns are set by instructions via DCI, a terminal receiving the DCI instructions can assume that only rate matching patterns included in the set can be indicated via DCI.

[0430] [Example #3] Mapping method for physical resources of CSI-RS

[0431] According to the formula of [Table 17] above, i.e., p=3000+s+j×L, AP indexing is performed by indexing APs belonging to the next CDM group after indexing all APs belonging to a specific CDM group. In this method, it may be difficult to reuse the existing codebook as is with only the remaining APs after some APs are muted. Therefore, the present disclosure proposes a new AP indexing method. The specific formula is p=3000+s×N / L+j, and the definitions of s, N, L, and j are the same as in [Table 17]. That is, s is a sequence index provided by Tables 7.4.1.5.3-2 to 7.4.1.5.3-5, L is a CDM group size of 1, 2, 4, or 8, and N is the number of CSI-RS ports. The CDM group index j given in Table 7.4.1.5.3-1 is the time / frequency location for a given row in Table 7.4.1.5.3-1. corresponds to. CDM groups are numbered in order of increasing frequency domain allocation first and then increasing time domain allocation. In this mapping method, indexing is performed for one AP belonging to a specific CDM group, and then indexing is performed for one AP belonging to the next CDM group, and the process is repeated. When the mapping method described above is applied to Fig. 21g, a result similar to Fig. 29a is obtained.

[0432] FIGS. 29A and 29B illustrate examples of AP mapping and port layout based on frequency domain and time domain priority allocation according to an embodiment of the present disclosure. Referring to FIG. 29A , in each of the RE groups or CDM groups indicated as '0', '1', '2', or '3', two APs are CDMed by applying frequency axis OCC, such that CSI-RS APs 3000 and 3004 are mapped to CDM group 0, CSI-RS APs 3001 and 3005 are mapped to CDM group 1, CSI-RS APs 3002 and 3006 are mapped to CDM group 2, and CSI-RS APs 3003 and 3007 are mapped to CDM group 3. Also, in this case, the mapping of APs for codebook configuration is as in Fig. 29b when (N1,N2)=(2,2).

[0433] In the example of Figure 29a, if all APs belonging to CDM group #0 / 2 are turned off, even if the codebook is constructed using only the remaining APs, the structure becomes (N1, N2) = (2, 1). Therefore, there is an advantage in that the structure supported by the existing NR standard can be reused as is.

[0434] The new AP mapping method proposed in this embodiment may have advantages and disadvantages depending on coexistence with existing terminals, whether there is a single or multiple panels, the maximum number of APs, etc. Therefore, when the base station configures a specific CSI-RS resource, the base station can additionally configure whether to apply the existing mapping method or the new mapping method according to the proposed technology. Alternatively, the mapping method may be determined by a predefined rule. For example, when a codebook for a single panel is configured, a rule may be defined such that the mapping method according to the proposed technology is applied, and when a codebook for a multi-panel is configured, the existing mapping method is applied. As another example, a rule may be defined such that in the case of an N1-port (e.g., N1=32) CSI-RS, the existing mapping method is applied, and in the case of an N2-port (e.g., N2=16) CSI-RS, the mapping method according to the proposed technology is applied.

[0435]

[0436] [Example #4] CSI-RS AP indexing method considering on / off, muting pattern, or port subset indication for AP of base station, and codebook structure

[0437] If the number of APs in a CSI-RS resource or a set of CSI-RS resources corresponding to a specific CSI report can vary due to signaling of on / off, muting pattern, or port subset indication for APs of a base station, configuration information related to codebook configuration or codebook subset restriction corresponding to each number of APs (e.g., parameters such as n1-n2 for a single-panel Type 1 codebook, ng-n1-n2 for a multi-panel Type 1 codebook, and n1-n2-codebookSubsetRestriction for a Type 2 codebook) may be required. Here, the codebook subset restriction mainly refers to a technology that can reduce the complexity of PMI calculation of a terminal by allowing PMI calculations associated with some APs to be omitted in consideration of interference with neighboring cells, etc. If the number of APs or the maximum number of APs of the CSI-RS resource or CSI-RS resource set corresponding to the corresponding CSI report is 32, then in the case of a single panel Type 1 codebook, four-four-TypeI-SinglePanel-Restriction parameters may be set as 256-bit bitmap information, i.e., (N1,N2)=(4,4). Additionally, if the corresponding CSI-RS resource can be changed to 16 ports by signaling related to on / off, muting pattern or port subset indication for APs, then assuming the same type of codebook, four-two-TypeI-SinglePanel-Restriction parameters may be set as 128-bit bitmap information, i.e., (N1,N2)=(4,2). Alternatively, even if the number of APs per sub-configuration is different by a setting such as Framework #3, the bitmap information for limiting the codebook subset can be provided as a single piece of information, taking into account the RRC signaling overhead.

[0438] As in the example described above, four-four-TypeI-SinglePanel-Restriction parameters, i.e., (N1, N2) = (4, 4), are set as 256-bit bitmap information, and 16 ports can be set in different sub-configurations within the configuration for the same CSI report. For the 256-bit information, the terminal can determine which bit information corresponds to which AP index based on the AP layout and the oversampling factor. Furthermore, since the terminal can determine which AP index is on through the port subset indication information, the terminal can extract codebook subset restriction information corresponding to the 16 ports based on the given 256-bit bitmap information. Based on the extracted information, the terminal can calculate PMI information for the sub-configuration corresponding to the 16 ports by performing codebook subset restriction.

[0439] As in Fig. 21q, when a 32-port CSI-RS is configured, AP indexing for a (4,4) port layout can be performed as in Fig. 30a. If CDM groups 2 / 3 / 6 / 7 of the 32-port CSI-RS are turned off, the port layout composed of the remaining APs can be determined as in Fig. 30b. However, the port layout composed of the remaining APs, as in Fig. 30b, is (N1, N2) = (2,4), which is a structure not supported by the current NR standard. Therefore, the present disclosure proposes embodiments for aligning the result as in Fig. 30b to the structure as in Fig. 23f, i.e., (N1, N2) = (4,2).

[0440] [Example #4-1] A method of sequentially mapping 1-to-1 with the port layout indexes that constitute the codebook by sorting the remaining AP indices in ascending or descending order can be applied. For example, the terminal can assume that the AP indices 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, and 23 of FIG. 30b are sequentially mapped 1-to-1 to 0 to 15 of FIG. 23f, calculate the PMI, and then report it to the base station. That is, for APs included in the AP subset, that is, APs that are on, the indices are mapped in ascending order of the indices assigned in the entire set, starting with index 0. In other words, APs included in the AP subset are mapped to consecutive APs starting from the index starting value (e.g., 0) in ascending order of their assigned indices within the entire set. Here, index 0 can be understood as 3000+0.

[0441] FIG. 31 illustrates an example of a procedure for mapping APs based on a subset of APs in a sub-configuration according to one embodiment of the present disclosure. FIG. 31 illustrates a method performed by a terminal.

[0442] Referring to FIG. 31, in step S3101, the terminal checks AP subset information. To generate CSI for one of multiple sub-configurations, the terminal checks information related to the AP subset associated with the sub-configuration. The AP subset may be indicated in bitmap format, with each bit of the bitmap corresponding to an AP, and the positions of the bits set to '1' indicate the AP(s) used in the corresponding sub-configuration, i.e., turned on.

[0443] In step S3103, the terminal performs index mapping for the APs indicated by the AP subset information. In other words, the terminal performs mapping between the APs included in the AP subset and their AP numbers. In other words, the terminal re-indexes the APs indicated by the AP subset information. An AP subset is a subset of the APs associated with the corresponding CSI report. Therefore, if the indexing results of all APs are used without change, the APs within the AP subset may have discontinuous indices. Therefore, the terminal can remap the indices to the APs so that the APs within the AP subset have continuous indices. For example, for the derivation of PMI, antenna ports corresponding to all bits with value of 1 in the bitmap are mapped to consecutive antenna ports starting at CSI-RS antenna port 3000 in increasing order of the bit position in the bitmap.

[0444] In step S3105, the terminal determines the PMI based on the AP subset. The terminal determines the AP layout corresponding to the AP subset based on the index mapping results of the AP layout and the AP subset corresponding to all APs, selects a codebook corresponding to the AP layout, and determines the PMI based on the selected codebook. For this purpose, although not illustrated in FIG. 31, the terminal may receive CSI-RSs from the base station.

[0445] As described with reference to FIG. 31, the terminal can determine AP indices for APs indicated by AP subset information. At this time, in order for the base station to interpret the PMI received from the terminal, it must select the same codebook as the terminal, and thus, index mapping for the APs in the AP subset can be performed in the same manner.

[0446] [Example #4-2] A method of adjusting the port layout of the remaining APs by rotating them 90 degrees clockwise or counterclockwise can be applied. For example, the terminal can assume a port layout of (N1, N2) = (4,2) based on AP indices as in FIG. 30c by rotating the result as in FIG. 30b 90 degrees clockwise, calculate the PMI, and report it to the base station. That is, the terminal can select a codebook and determine the PMI based on the port layout with the changed N1 and N2 values ​​of the port layout of the remaining APs, which are obtained by exchanging each other.

[0447] For a multi-panel-based codebook type, the aforementioned [Example #4-1] and [Example #4-2] can be applied to each panel. Furthermore, [Example #4] can be applied even after applying a new AP mapping method, such as [Example #3].

[0448] FIG. 32 illustrates an example of a procedure for transmitting a CSI report based on sub-settings according to one embodiment of the present disclosure. FIG. 32 illustrates signal exchange between a terminal (3210) and a base station (3220).

[0449] Referring to FIG. 32, in step S3201, the base station (3220) transmits configuration information regarding codebook subset restrictions that depend on AP on / off or muting patterns to the terminal (3210). That is, multiple AP count values ​​can be configured for a CSI-RS resource or CSI-RS resource set linked to a specific CSI report. At this time, information related to codebook subset restrictions for each AP count can be configured in advance.

[0450] In step S3203, the base station (3220) transmits an indication of an AP on / off or muting pattern to the terminal (3210). For example, the base station (3220) may transmit configuration information related to CSI reporting, and the configuration information may include information related to an AP subset as an indication of an AP on / off or muting pattern.

[0451] In step S3205, the terminal (3210) performs CSI AP remapping and PMI calculation. If a specific number of APs is indicated by the base station (3220), the terminal (3210) can determine a port layout corresponding to the number of APs. For example, the terminal (3210) can determine the port layout according to [Example #4]. In addition, the terminal (3210) can modify the AP indexing based on pre-configured codebook subset restriction information.

[0452] In step S3207, the terminal (3210) reports the acquired PMI value. In other words, the terminal (3210) transmits a CSI report including the PMI value. The terminal (3210) may calculate the PMI value based on the port layout determined in step S3205 and transmit the CSI report including the PMI value to the base station (3220).

[0453] [Example #5] Non-PMI Instruction Method

[0454] Below [Table 18] shows the UE's behavior according to the settings related to CSI reporting extracted from the TS 38.214 document. Referring to [Table 18] below, in the configuration information related to CSI reporting (e.g., CSI-ReportConfig), if the parameter for the report item (e.g., report quantity) is set to 'cri-RI-CQI', the port index order for each rank can be determined according to a pre-set / defined rule. In the case of the existing CSI-ReportConfig, CSI-RS resources set with the same number of APs can be set for CMR. However, when a CSI framework such as the aforementioned [Embodiment #3] for NES is introduced, different AP number values ​​can be set for each sub-configuration based on the port subset indication information. In this case, the existing non-PMI indication mechanism that operates based on the number of APs in the CSI-RS resource configuration may not operate properly.

[0455]

[0456] Since the number of APs corresponding to each sub-configuration may vary, one of the embodiments described below may be applied, or different embodiments may be applied to each sub-configuration. The embodiments described below may be applied in a situation where at least one sub-configuration is configured within a CSI reporting configuration, and bitmap-based port subset indication information is configured for at least one sub-configuration.

[0457]

[0458] FIG. 33 illustrates an example of a procedure for reporting non-PMI-based CSIs for sub-configurations according to one embodiment of the present disclosure. FIG. 33 illustrates a method performed by a terminal.

[0459] Referring to FIG. 33, in step S3301, 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 at least one of different AP number values, AP subsets, or power offset values. In this case, in the present embodiment, the configuration information for CSI reporting may be set not to include PMI as a report item.

[0460] In step S3303, the terminal checks AP subset information for each sub-configuration. The configuration information received from the base station may include AP subset information for each sub-configuration. Specifically, the configuration information received from the base station may include a list of multiple sub-configurations, and the sub-configurations may include different AP subsets. That is, the sub-configurations may be associated with information about the AP subsets. Accordingly, the terminal may use the bitmap information to check the AP subset applied to the corresponding sub-configuration, i.e., the index of the AP(s) that are turned on and / or the index of the AP(s) that are turned off. For example, the AP subset may be expressed in the form of a bitmap.

[0461] In step S3305, the terminal verifies the rank-to-port mapping for non-PMI feedback per sub-configuration. When performing non-PMI-based CSI feedback, the terminal can transmit at least one of CRI, RI, and CQI without PMI. To this end, the AP(s) for which measurements are performed per rank are configured using port indexes / numbers. At this time, if the APs configured per sub-configuration are different, the terminal can determine the port set(s) per rank value according to a predefined or configured rule. To this end, the terminal can perform AP re-indexing for at least some of the sub-configurations or reuse port configuration information applied to other sub-configurations.

[0462] In step S3307, the terminal generates CSIs for sub-configurations. Here, the CSI may include at least one of CRI, RI, and CQI. To calculate the RI and / or CQI, the terminal may perform measurements based on the mapping relationship between rank values ​​and ports. That is, although not illustrated in FIG. 33, after receiving at least one CSI-RS, the terminal may generate CSIs for each sub-configuration based on the port set for each rank and the measurement results for the CSI-RS.

[0463] In step S3309, the terminal transmits a CSI report containing CSIs. In other words, the terminal feeds back CSIs for each sub-configuration to the base station. That is, the terminal transmits the CSI report using the resources indicated by the configuration information for the CSI report. Here, the CSI report may be transmitted via a single message or multiple messages.

[0464] FIG. 34 illustrates an example of a procedure for receiving non-PMI-based CSIs for sub-configurations according to one embodiment of the present disclosure. FIG. 34 illustrates a method performed by a base station.

[0465] Referring to FIG. 34, in step S3401, the base station generates AP subset information for each sub-configuration. In providing configurations related to CSI reporting, the base station may provide multiple sub-configurations for one CSI-RS resource or a set of CSI-RS resources. In this case, the sub-configurations may be distinguished by at least one of the number of APs, AP subsets, and power offsets. For example, the base station may generate AP subset information for each sub-configuration that expresses the AP subset in the form of a bitmap.

[0466] In step S3403, the base station generates port information for non-PMI feedback for at least one sub-configuration. The port information for non-PMI feedback indicates a set of APs by rank, and specifically, indicates at least one AP index corresponding to each rank. Here, the port information for non-PMI feedback may be generated for each of all sub-configurations or for each of some sub-configurations.

[0467] In step S3405, the base station transmits 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 at least one of different AP number values, AP subsets, or power offset values. In this case, the configuration information may include AP subset information for each sub-configuration generated in step S3401 and port information for non-PMI feedback generated in step S3403.

[0468] In step S3407, the base station receives a CSI report containing CSIs. Here, the CSI report may include CSIs for each sub-set. In other words, the base station receives CSIs for each sub-set from the terminal.

[0469] Although not illustrated in FIG. 34, the base station may transmit at least one CSI-RS via CSI-RS resources associated with configuration information for a CSI report. Furthermore, the base station may receive a CSI report using resources indicated by the configuration information for the CSI report. Here, each CSI may include RI and / or CQI. To interpret RI and / or CQI, a mapping of ranks to AP sets is required. Accordingly, the base station may determine port sets(s) for each rank value based on established or predefined or established rules. To this end, the base station may perform AP re-indexing for at least some of the sub-sets, or reuse port configuration information applicable to other sub-sets.

[0470] [Example #5-1] Parameters related to rank-specific port mapping for non-PMI feedback (e.g., non-PMI-PortIndication) may be set for each sub-configuration. For example, 8-port NZP CSI-RS resources #1 / #2 may be set for CMR, and port subset indication information of '1111 1111' may be set for sub-configuration index #1, and port subset indication information of '0000 1111' may be set for sub-configuration index #2. At this time, when [Example #5-1] is applied, the non-PMI-PortIndication parameter may be set based on P=8 for sub-configuration #1, and the non-PMI-PortIndication parameter may be set based on P=4 for sub-configuration #2. For sub-configuration #2, when the non-PMI-PortIndication parameter is set based on P=4, each AP index can be kept the same as the existing port indexing (e.g. port index 4 / 5 / 6 / 7), or can be re-indexed or re-mapped in ascending or descending order based on the ports that are on (e.g. port index 0 / 1 / 2 / 3).

[0471] FIG. 35 illustrates an example of a procedure for determining a set of APs corresponding to each rank for non-PMI feedback based on a subset of APs in a sub-configuration, according to one embodiment of the present disclosure. FIG. 35 illustrates a method performed by a terminal. FIG. 35 illustrates operations for one sub-configuration, and if multiple sub-configurations are included, the procedure of FIG. 35 may be repeated.

[0472] Referring to Fig. 35, in step S3501, the terminal checks AP subset information for sub-configuration. That is, the terminal checks information related to the AP subset associated with the sub-configuration. The AP subset may be indicated in bitmap format, with each bit of the bitmap corresponding to an AP, and the positions of the bits set to '1' indicate the AP(s) used in the corresponding sub-configuration, i.e., turned on.

[0473] In step S3503, the terminal determines the indexes of the APs indicated by the AP subset information. The APs have indices assigned in the full AP state corresponding to the configuration related to the CSI report including the sub-configuration. However, if some of the APs are used by the AP subset information, and the indexing results in the full AP state are used without change, the APs within the AP subset may have discontinuous indices. Therefore, new indices may be assigned within the sub-configuration so that the APs within the AP subset have continuous indices. That is, the terminal re-indexes the APs indicated by the AP subset information. In other words, the terminal can remap the indices to the APs. For example, the CSI-RS port indices can be derived by mapping antenna ports corresponding to all bits with value of 1 in the bitmap as consecutive antenna ports starting at CSI-RS port index 0 in increasing order of the bit position in the bitmap.

[0474] In step S3505, the terminal determines a set of APs per rank according to the sub-configuration. The terminal can determine a set of AP indexes per rank based on parameters related to port mapping per rank for non-PMI feedback included in the sub-configuration (e.g., non-PMI-PortIndication) (hereinafter, “rank-specific port mapping information”) and the indices of APs re-indexed in step S3503. Here, the rank-specific port mapping information can be set based on the number of bits having a value of 1 in the bitmap of the corresponding sub-configuration. That is, the rank-specific port mapping information can indicate AP index sets for ranks less than or equal to the number of bits having a value of 1 in the bitmap. At this time, the indices indicated by the rank-specific port mapping information can be interpreted based on the indices re-indexed in step S3503.

[0475] As described with reference to FIG. 35, the terminal can determine AP indices for APs indicated by the AP subset information. Accordingly, when calculating RI and / or CQI, the terminal can utilize the AP indices determined based on the AP subset information. At this time, in order for the base station to interpret the RI and / or CQI received from the terminal, the base station will need to re-index the AP indices for the sub-configuration, and thus can perform index mapping for the APs of the AP subset in the same manner as the terminal.

[0476]

[0477] [Example #5-2] For a sub-configuration in which a parameter related to rank-specific port mapping for non-PMI feedback (e.g., non-PMI-PortIndication) is not set, ports that are turned on according to port subset indication information in the sub-configuration may correspond to each rank in the order of port index. For example, 8-port NZP CSI-RS resources #1 / #2 may be set for CMR, port subset indication information of '1111 1111' may be set in sub-configuration index #1, and port subset indication information of '0000 1111' may be set in sub-configuration index #2. In this case, if non-PMI-PortIndication is not set for sub-setting #2, port index 4 can correspond to rank 1, port index 4 / 5 to rank 2, port index 4 / 5 / 6 to rank 3, and port index 4 / 5 / 6 / 7 to rank 4, in that order.

[0478] Alternatively, re-indexing or re-mapping of port indices may be performed for ports that are turned on. For example, re-indexing or re-mapping may be performed in ascending or descending order for ports that are turned on (e.g., port indices 0 / 1 / 2 / 3). In this case, port index 0 may correspond to rank 1, port indices 0 / 1 to rank 2, port indices 0 / 1 / 2 to rank 3, and port indices 0 / 1 / 2 / 3 to rank 4, in that order.

[0479] FIG. 36 illustrates an example of a procedure for determining a set of APs corresponding to each rank for non-PMI feedback based on a subset of APs in a sub-configuration, according to one embodiment of the present disclosure. FIG. 36 illustrates a method performed by a terminal. FIG. 36 illustrates operations for one sub-configuration, and if multiple sub-configurations are included, the procedure of FIG. 36 may be repeated.

[0480] Referring to Fig. 36, in step S3601, the terminal checks AP subset information for sub-configuration. That is, the terminal checks information related to the AP subset associated with the sub-configuration. The AP subset may be indicated in bitmap format, with each bit of the bitmap corresponding to an AP, and the positions of the bits set to '1' indicate the AP(s) used in the corresponding sub-configuration, i.e., turned on.

[0481] In step S3603, the terminal determines the indexes of the APs indicated by the AP subset information. The APs have indices assigned in the full AP state corresponding to the configuration related to the CSI report including the sub-configuration. However, if some of the APs are used by the AP subset information, and the indexing results in the full AP state are used without change, the APs within the AP subset may have discontinuous indices. Therefore, new indices may be assigned within the sub-configuration so that the APs within the AP subset have continuous indices. That is, the terminal re-indexes the APs indicated by the AP subset information. In other words, the terminal may remap the indices to the APs. For example, the CSI-RS port indices can be derived by mapping antenna ports corresponding to all bits with value of 1 in the bitmap as consecutive antenna ports starting at CSI-RS port index 0 in increasing order of the bit position in the bitmap.

[0482] In step S3605, the terminal determines a set of APs by rank according to the index order. The terminal can determine a set of AP indices by rank based on the indices of the APs re-indexed in step S3603. Here, ranks having a value less than or equal to the number of bits having a value of 1 in the bitmap are considered. The terminal can determine an AP set corresponding to a corresponding rank by selecting AP(s) in ascending order of port indices equal to the value of the rank.

[0483] As described with reference to FIG. 36, the terminal can determine AP indices for APs indicated by the AP subset information. Accordingly, when calculating RI and / or CQI, the terminal can utilize the AP indices determined based on the AP subset information. At this time, in order for the base station to interpret the RI and / or CQI received from the terminal, the base station will need to re-index the AP indices for the sub-configuration, and thus can perform index mapping for the APs of the AP subset in the same manner as the terminal.

[0484]

[0485] [Example #5-2A] For a sub-configuration in which a parameter related to rank-specific port mapping for non-PMI feedback (e.g., non-PMI-PortIndication) is not set, non-PMI-PortIndication parameter information set in another sub-configuration may be applied. This embodiment may be applied when the port subset indication information set for two sub-configurations is the same. For example, 8-port NZP CSI-RS resources #1 / #2 may be set for CMR, port subset indication information of '1111 1111' may be set in sub-configuration index #1, port subset indication information of '0000 1111' and power offset delta value A may be set in sub-configuration index #2, and port subset indication information of '0000 1111' and power offset delta value B may be set in sub-configuration index #3. At this time, if the non-PMI-PortIndication parameter is set to sub-setting index #2 and the non-PMI-PortIndication parameter is not set to sub-setting index #3, the port subset indication information set to the two sub-settings is the same, so the non-PMI-PortIndication parameter information set to sub-setting index #2 can be commonly applied to sub-setting index #3 as well.

[0486] [Example #5-3] Parameters related to port mapping per rank for non-PMI feedback (e.g., non-PMI-PortIndication) may not be set for each sub-configuration, but may be set within CSI-ReportConfig. In this case, the non-PMI-PortIndication setting may be applied to a sub-configuration that is a full AP, i.e., one in which all bitmap information including port subset indication information is 1's. For other sub-configurations, as in [Example #5-2], ports that are turned on according to the port subset indication information within the sub-configuration may correspond to each rank in the order of the port index. If the non-PMI-PortIndication parameter is not set, even for a sub-configuration that is a full AP, the ports may correspond to each rank in the order of the port index.

[0487] According to Example #5-3, for a sub-configuration configured as a full AP, the terminal determines a rank-specific AP set based on the non-PMI-PortIndication applied to the entire CSI report. Furthermore, for a sub-configuration configured as a subset of APs other than a full AP, the terminal can determine a rank-specific AP set based on the order of the indices of the APs activated according to the port subset indication information.

[0488] [Example #5-4] Even if the number of APs is different for each sub-configuration, CSI can be calculated based on a common port index order. At this time, when calculating CSI corresponding to a specific sub-configuration, the terminal can exclude rank values ​​including port indexes that are in an off state from calculation / reporting. For example, 8-port NZP CSI-RS resources #1 / #2 are configured for CMR, and port subset indication information of '1111 1111' can be set for sub-configuration index #1, and port subset indication information of '0000 1111' can be set for sub-configuration index #2. At this time, if the port index associated with rank=1 is 7, and the port index associated with rank=2 is 0 / 7, the terminal can exclude rank=2 including port index 0 that is in an off state from calculation / reporting for CSI calculation for sub-configuration #2.

[0489] According to embodiment #5-4, the terminal identifies a set of APs per rank that are commonly applied to multiple sub-configurations. For example, the sets of APs per rank that are commonly applied can be identified by a parameter related to port mapping per rank for non-PMI feedback (e.g., non-PMI-PortIndication) included in a configuration related to CSI reporting. In addition, when determining CSI for each sub-configuration, the terminal can exclude from CSI calculation a rank mapped to an AP set that includes a port that is disabled in the corresponding sub-configuration among the sets of APs per rank that are commonly applied.

[0490] If, as a result of applying the rule according to embodiment #5-4 to a specific sub-configuration, no reportable rank exists, CSI reporting may be performed according to another embodiment. For example, as in embodiment #5-2, ports may be assigned to each rank in the order of port indexes that are turned on according to the port subset indication information within the corresponding sub-configuration. Alternatively, calculation / reporting may be permitted only for rank = 1 through the first port among the ports that are turned on according to the port subset indication information within the corresponding sub-configuration.

[0491] Alternatively, if no reportable rank exists as a result of applying rule #5-4 to a specific sub-configuration, default CSI information may be reported. For example, the default CSI information may include a PIM / CQI corresponding to a specific PMI / CQI value and the lowest index / value. Alternatively, CSI information corresponding to the sub-configuration may be dropped / omited. Alternatively, the terminal may not expect a configuration in which no reportable rank exists.

[0492] [Embodiment #5-5] For a configuration related to CSI reporting that includes at least one sub-configuration, if a parameter for the report item (e.g., reportQuantity) is set to 'cri-RI-CQI', a constraint may be imposed that the non-PMI-PortIndication parameter is always set for each sub-configuration or at least for sub-configurations that have different port subset indication information. Alternatively, the non-PMI-PortIndication parameter may be set for all sub-configurations within the same CSI reporting configuration, or only the non-PMI-PortIndication parameter may not be set for any sub-configuration. If the non-PMI-PortIndication parameter is not set for any sub-configuration, another embodiment may be applied. For example, as in Embodiment #5-2, ports may correspond to each rank in the order of port indexes that are turned on according to the port subset indication information within the corresponding sub-configuration.

[0493] [Embodiment #5-6] Different embodiments may be applied depending on whether a parameter related to port mapping per rank for non-PMI feedback (e.g., non-PMI-PortIndication) is set within a sub-configuration. If the non-PMI-PortIndication parameter is set within a sub-configuration, Embodiment #5-1 may be applied. If the non-PMI-PortIndication parameter is not set for a certain sub-configuration, but the non-PMI-PortIndication parameter is set within a CSI reporting configuration, Embodiment #5-2, Embodiment #5-2A, or Embodiment #5-4 may be applied. If the non-PMI-PortIndication parameter is not set for both the sub-configuration and the CSI reporting configuration, ports may be assigned to each rank in the order of port indexes that are turned on according to the port subset indication information within the corresponding sub-configuration, as in Embodiment #5-2.

[0494] According to the various embodiments described above, in particular, according to embodiments #5-1 and #5-2, the TS 38.214 standard document may be modified as shown in [Table 19] below.

[0495]

[0496] At least some of the various embodiments described above may also be applied in the case of Type-2 SD (spatial domain) or Type-2 SD + PD (power domain) adaptations.

[0497] [Embodiment #5-1'] Parameters related to rank-specific port mapping for non-PMI feedback (e.g., non-PMI-PortIndication) may be set for each sub-configuration. For example, 8-port NZP CSI-RS resources #1 / #2 may be set for CMR, and resource #1 may be linked to sub-configuration index #1, and resource #2 may be linked to sub-configuration index #2. In this case, when Embodiment #5-1 is applied, the non-PMI-PortIndication parameter may be set for sub-configuration #1 based on P=8, and the non-PMI-PortIndication parameter may also be set for sub-configuration #2 based on P=8.

[0498] [Example #5-2'] For sub-settings where non-PMI-PortIndication is not set, each rank can be corresponded to in the order of port index.

[0499] [Embodiment #5-2A'] For a sub-configuration in which non-PMI-PortIndication is not set, non-PMI-PortIndication parameter information set in another sub-configuration may be applied. This embodiment may be applied only when the CSI-RS resource ID list information set for two sub-configurations is the same. For example, 8-port NZP CSI-RS resources #1 / #2 / #3 / #4 are set for CMR, the CSI-RS resource ID list information may be set to {#1,#2} in sub-configuration index #1, the CSI-RS resource ID list information may be set to {#3,#4} in sub-configuration index #2, the power offset delta value may be set to A, and the CSI-RS resource ID list information may be set to {#3,#4} in sub-configuration index #3, and the power offset delta value may be set to B. In this case, if the non-PMI-PortIndication parameter is set in sub-configuration index #2 and the non-PMI-PortIndication parameter is not set in sub-configuration index #3, the CSI-RS resource ID list information set in the two sub-configurations is the same, so the non-PMI-PortIndication parameter information set in sub-configuration index #2 can be commonly applied to sub-configuration index #3 as well.

[0500] [Example #5-3'] The non-PMI-PortIndication setting may not be set for each sub-setting, but may be set within the settings related to CSI reporting (e.g., CSI-ReportConfig). In this case, the non-PMI-PortIndication setting may be applied commonly to all sub-settings.

[0501] [Example #5-5'] When a parameter for a report item (e.g., reportQuantity) is set to 'cri-RI-CQI' for a configuration related to CSI reporting in which at least one sub-configuration is set, a constraint may be imposed that the non-PMI-PortIndication parameter is always set for each sub-configuration, or at least for sub-configurations with different list information.

[0502] [Embodiment #5-6'] If the non-PMI-PortIndication parameter is set within the sub-configuration, Embodiment #5-1' may be applied. Alternatively, if the non-PMI-PortIndication parameter is not set for any sub-configuration but the non-PMI-PortIndication parameter is set within the CSI reporting configuration, Embodiment #5-2' or Embodiment #5-2A' may be applied. Alternatively, if the non-PMI-PortIndication parameter is not set for either the sub-configuration or the CSI reporting configuration, Embodiment #5-2' may be applied.

[0503] The present disclosure can reduce base station power consumption by providing a mechanism for dynamically turning on and off some APs based on factors such as the communication status and data volume of associated terminals. Furthermore, AP indexing, which considers AP on / off status and codebook structure, allows existing CSI calculation methods to be reused even when some APs are turned off.

[0504]

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

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

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

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

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

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving configuration information for a channel state information (CSI) report including at least one sub-configuration; A step of identifying information related to a subset of antenna ports associated with at least one of the above sub-settings; A step for verifying rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-set; A step of generating CSI for said at least one sub-configuration based on a measurement result based on at least one CSI-RS related to said CSI report; and A step of transmitting a CSI report including the above CSI to a base station, The above CSI includes at least one of RI (rank indicator) or CQI (channel quality information), The RI or the CQI is calculated based on the rank-to-port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, A method in which the above antenna port indices are determined by mapping the antenna ports to consecutive values ​​starting from the starting value of the index in ascending order of the index within the entire set.

2. In claim 1, The above antenna port subset is indicated using a bitmap.

3. In claim 1, A method wherein the above rank-to-port mapping is determined based on parameters related to rank-to-port mapping for non-PMI feedback included in at least one sub-configuration.

4. In claim 3, The above rank-to-port mapping includes a first set of antenna ports corresponding to a first rank and a second set of antenna ports corresponding to a second rank, The first rank is mapped to antenna ports indicated by parameters related to port mapping by rank, as many as the number of antenna ports as the value of the first rank, The second rank is a method in which antenna ports are mapped to antenna ports indicated by parameters related to port mapping by rank, as many as the number of antenna ports equal to the value of the second rank.

5. In claim 1, The above rank-to-port mapping is determined based on the order of the antenna port indices.

6. In claim 5, The above rank-to-port mapping includes a first set of APs corresponding to a first rank and a second set of APs corresponding to a second rank, The above first rank is mapped to a number of APs equal to the value of the first rank selected in ascending order of the antenna port indices, The above second rank is mapped to a number of APs equal to the value of the second rank selected in ascending order of the antenna port indices.

7. In claim 1, wherein said at least one sub-setting comprises a first sub-setting and a second sub-setting, A method wherein the rank-to-port mapping for the first sub-configuration is determined based on parameters related to rank-to-port mapping for non-PMI feedback included in the second sub-configuration.

8. In claim 7, The second sub-setting is set to the same antenna port subset as the first sub-setting.

9. In claim 1, The above rank-to-port mapping is determined based on a set of rank-specific antenna ports that are commonly applied to at least one sub-configuration, A method in which a rank mapped to at least one port set including an antenna port that is turned off in the corresponding sub-setting among the sets of antenna ports for each rank is excluded from generating the CSI.

10. 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 that includes at least one sub-configuration, Identify information related to a subset of antenna ports associated with at least one of the above sub-settings, Check rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-setup, Generating CSI for said at least one sub-configuration based on a measurement result based on at least one CSI-RS related to said CSI report, It is configured to transmit a CSI report including the above CSI to the base station, The above CSI includes at least one of RI (rank indicator) or CQI (channel quality information), The RI or the CQI is calculated based on the rank-to-port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, The above antenna port indices are determined by mapping the antenna ports to consecutive values ​​starting from the start value of the index in ascending order of the index within the entire set.

11. In communication devices, At least one processor; At least one computer memory connected to said at least one processor and storing instructions that direct operations when executed by said at least one processor, The above actions are, A step of receiving configuration information for a channel state information (CSI) report including at least one sub-configuration; A step of identifying information related to a subset of antenna ports associated with at least one of the above sub-settings; A step for verifying rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-set; A step of generating CSI for said at least one sub-configuration based on a measurement result based on at least one CSI-RS related to said CSI report; and A step of transmitting a CSI report including the above CSI to a base station, The above CSI includes at least one of RI (rank indicator) or CQI (channel quality information), The RI or the CQI is calculated based on the rank-to-port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, A communication device in which the above antenna port indices are determined by mapping the antenna ports to consecutive values ​​starting from the start value of the index in ascending order of the index within the entire set.

12. In a non-transitory computer-readable medium storing at least one instruction, comprising at least one instruction executable by the processor, At least one of the above commands causes the device to: Receive configuration information for a CSI (channel state information) report that includes at least one sub-configuration, Identify information related to a subset of antenna ports associated with at least one of the above sub-settings, Check rank to port mapping for non-PMI (precoding matrix indicator) feedback per sub-setup, Generating CSI for said at least one sub-configuration based on a measurement result based on at least one CSI-RS related to said CSI report, Instructs the base station to transmit a CSI report including the above CSI, The above CSI includes at least one of RI (rank indicator) or CQI (channel quality information), The RI or the CQI is calculated based on the rank-to-port mapping determined based on antenna port indices mapped to antenna ports included in the antenna port subset, A computer-readable medium wherein the antenna port indices are determined by mapping the antenna ports to consecutive values ​​starting from a starting value of the index in ascending order of the index within the entire set.

Images