Method and apparatus for transmitting and receiving channel state information in a wireless communication system

Abstract

Disclosed are methods and apparatus for transmitting and receiving channel state information in a wireless communication system. The method for transmitting channel state information (CSI) according to an embodiment of the present disclosure may include the following steps: receiving CSI-related configuration information from a base station, wherein the configuration information includes information about a CSI-RS resource set; receiving a CSI reference signal (CSI-RS) from the base station; and transmitting the CSI to the base station based on the configuration information and the CSI-RS. A CSI-RS resource set may include M (M is a natural number) CSI-RS resource groups; N (N ≤ M, N is a natural number) CSI-RS resource groups for reporting CSI may be determined from the M CSI-RS resource groups; the CSI may include N CSI sets generated based on the combination of CSI-RS resources in the N CSI-RS resource groups; to generate the nth (1 ≤ n ≤ N)th CSI set, specific CSI-RS resources in the nth (1 ≤ n ≤ N)th CSI-RS resource group may be used for channel measurement; and specific CSI-RS resources in the remaining CSI-RS groups except the nth CSI-RS resource group may be used for interference measurement.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving channel state information in the wireless communication system. Background Art

[0002] A mobile communication system has been developed to provide voice services while ensuring user mobility. However, the mobile communication system has been expanded to include data services as well as voice services, and currently, the explosive growth of services has led to a shortage of resources, and users have demanded faster services, thus requiring more advanced mobile communication systems.

[0003] The overall requirement for next-generation mobile communication systems is to support the accommodation of explosive data services, significantly increase the transmission rate per user, accommodate a significantly increased number of connected devices, provide very low end-to-end latency, and achieve high energy efficiency. To this end, various technologies have been studied, including dual connectivity, massive multiple-input multiple-output (Massive MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking. Summary of the Invention

[0004] Technical issues

[0005] The technical purpose of the present disclosure is to provide a method and device for transmitting and receiving channel state information.

[0006] In addition, an additional technical objective of the present disclosure is to provide a method and apparatus for sending and receiving joint channel state information of a channel state information reference signal (CSI-RS) sent from multiple TRPs (transmitting reception points).

[0007] The technical objectives achieved by the present disclosure are not limited to the above-mentioned technical objectives, and other technical objectives not described herein will be clearly understood by those skilled in the relevant art from the following description.

[0008] Technical Solution

[0009] According to one aspect of the present disclosure, a method for transmitting channel state information (CSI) in a wireless communication system may include: receiving CSI-related configuration information from a base station, wherein the configuration information includes information about a CSI-RS resource set; receiving a CSI reference signal (CSI-RS) from the base station; and transmitting the CSI to the base station based on the configuration information and the CSI-RS. The CSI-RS resource set may include M (M is a natural number) CSI-RS resource groups, N (N≤M, N is a natural number) CSI-RS resource groups for reporting the CSI may be determined from the M CSI-RS resource groups, the CSI may include N CSI sets generated based on a combination of CSI-RS resources in the N CSI-RS resource groups, and to generate an nth (1≤n≤N) CSI set, specific CSI-RS resources in the nth (1≤n≤N) CSI-RS resource group may be used for channel measurement, and specific CSI-RS resources in the remaining CSI-RS groups other than the nth CSI-RS resource group may be used for interference measurement.

[0010] According to another aspect of the present disclosure, a terminal for transmitting channel state information (CSI) may include: at least one transceiver for transmitting and receiving wireless signals, and at least one processor for controlling the at least one transceiver. The at least one processor may be configured to: receive CSI-related configuration information from a base station, wherein the configuration information includes information about a CSI-RS resource set; receive a CSI reference signal (CSI-RS) from the base station; and transmit the CSI to the base station based on the configuration information and the CSI-RS. The CSI-RS resource set may include M (M is a natural number) CSI-RS resource groups, and N (N≤M, N is a natural number) CSI-RS resource groups for reporting the CSI may be determined from the M CSI-RS resource groups. The CSI may include N CSI sets generated based on the CSI-RS resource combination in the N CSI-RS resource groups. In order to generate the nth (1≤n≤N) CSI set, a specific CSI-RS resource in the nth (1≤n≤N) CSI-RS resource group may be used for channel measurement, and specific CSI-RS resources in the remaining CSI-RS groups except the nth CSI-RS resource group may be used for interference measurement.

[0011] According to another aspect of the present disclosure, a method for receiving channel state information (CSI) in a wireless communication system may include: transmitting CSI-related configuration information to a terminal, wherein the configuration information includes information about a CSI-RS resource set; transmitting a CSI reference signal (CSI-RS) to the terminal; and receiving the CSI from the terminal based on the configuration information and the CSI-RS. The CSI-RS resource set may include M (M is a natural number) CSI-RS resource groups, N (N≤M, N is a natural number) CSI-RS resource groups for reporting the CSI may be determined from the M CSI-RS resource groups, the CSI may include N CSI sets generated based on a combination of CSI-RS resources in the N CSI-RS resource groups, and to generate an nth (1≤n≤N) CSI set, specific CSI-RS resources in the nth (1≤n≤N) CSI-RS resource group may be used for channel measurement, and specific CSI-RS resources in the remaining CSI-RS groups other than the nth CSI-RS resource group may be used for interference measurement.

[0012] In at least one non-transitory computer-readable medium storing at least one instruction, the at least one instruction executable by at least one processor can control a device to: receive CSI-related configuration information from a base station, wherein the configuration information includes information about a CSI-RS resource set; receive a CSI reference signal (CSI-RS) from the base station; and send the CSI to the base station based on the configuration information and the CSI-RS. The CSI-RS resource set may include M (M is a natural number) CSI-RS resource groups, and N (N≤M, N is a natural number) CSI-RS resource groups for reporting the CSI may be determined from the M CSI-RS resource groups. The CSI may include N CSI sets generated based on the CSI-RS resource combination in the N CSI-RS resource groups. In order to generate the nth (1≤n≤N) CSI set, a specific CSI-RS resource in the nth (1≤n≤N) CSI-RS resource group may be used for channel measurement, and specific CSI-RS resources in the remaining CSI-RS groups except the nth CSI-RS resource group may be used for interference measurement.

[0013] A processing device configured to control a terminal to transmit CSI (channel state information) in a wireless communication system may include: at least one processor; and at least one computer memory, the at least one computer memory being operably connected to the at least one processor and storing instructions for performing operations upon execution by the at least one processor. The operations may include: receiving CSI-related configuration information from a base station, wherein the configuration information includes information about a CSI-RS resource set; receiving a CSI reference signal (CSI-RS) from the base station; and transmitting the CSI to the base station based on the configuration information and the CSI-RS. The CSI-RS resource set may include M (M is a natural number) CSI-RS resource groups, and N (N≤M, N is a natural number) CSI-RS resource groups for reporting the CSI may be determined from the M CSI-RS resource groups. The CSI may include N CSI sets generated based on the CSI-RS resource combination in the N CSI-RS resource groups. In order to generate the nth (1≤n≤N) CSI set, a specific CSI-RS resource in the nth (1≤n≤N) CSI-RS resource group may be used for channel measurement, and specific CSI-RS resources in the remaining CSI-RS groups except the nth CSI-RS resource group may be used for interference measurement.

[0014] Preferably, the layer indicator (LI) may be reported independently by the CSI for N CSI sets.

[0015] Preferably, the number of LIs can be determined based on the maximum number of ports of a phase tracking reference signal (PTRS) configured in the terminal.

[0016] Preferably, the CSI-RS resource combination to be calculated by the terminal in the N CSI-RS resource groups may be configured by configuration information.

[0017] Preferably, the configuration information may include information on CSI interference measurement (CSI-IM) resources used for interference measurement, and a specific CSI-RS resource combination in N CSI-RS resource groups may be mapped to the same CSI-IM resource.

[0018] Preferably, for the CSI-RS resource combinations in the N CSI-RS resource groups, quasi-co-location (QCL) type reference signals for different spatial Rx parameters can be configured.

[0019] Preferably, the CSI calculation time for CSI reporting based on a CSI-RS resource combination can be determined by adding additional time based on a parameter value related to the CSI calculation time configured for CSI reporting based on a single CSI-RS resource.

[0020] Preferably, in order to derive CSI, it may be assumed that resource elements for ports of 2 or more phase tracking reference signals (PTRS) exist in the CSI reference resource.

[0021] Beneficial effects

[0022] According to an embodiment of the present disclosure, optimal channel state information for performing transmission of multiple TRPs (Transmission Reception Points) may be acquired / reported.

[0023] In addition, according to an embodiment of the present disclosure, when optimal channel state information for performing transmission of multiple TRPs (transmission reception points) is acquired / reported, more appropriate link adaptation can be performed.

[0024] In addition, according to an embodiment of the present disclosure, when optimal channel state information for performing transmission of multiple TRPs (transmission reception points) is acquired / reported, the performance of the wireless communication system can be improved.

[0025] Effects achievable by the present disclosure are not limited to the above-described effects, and those skilled in the art can clearly understand other effects not described herein through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are included as a part of the detailed description for understanding the present disclosure, provide embodiments of the present disclosure and describe technical features of the present disclosure through the detailed description.

[0027] Figure 1 The diagram shows a structure of a wireless communication system to which the present disclosure can be applied.

[0028] Figure 2 FIG2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

[0029] Figure 3 FIG2 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

[0030] Figure 4 The figure illustrates physical resource blocks in a wireless communication system to which the present disclosure can be applied.

[0031] Figure 5 The diagram illustrates a time slot structure in a wireless communication system to which the present disclosure can be applied.

[0032] Figure 6 Physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the physical channels are illustrated.

[0033] Figure 7 The diagram illustrates a method for sending multiple TRPs in a wireless communication system to which the present disclosure may be applied.

[0034] Figure 8 The figure illustrates an interference signal of a terminal when multiple TRPs are transmitted in a wireless communication system to which the present disclosure can be applied.

[0035] Figure 9 Illustrated are CSI sets and resource groups in a resource set according to an embodiment of the present disclosure.

[0036] Figure 10 Illustrated are CSI sets and resource groups in a resource set according to an embodiment of the present disclosure.

[0037] Figure 11 and Figure 12 Illustrated are CSI sets and resource groups in a resource set according to an embodiment of the present disclosure.

[0038] Figure 13 Illustrated is information about a CDM group and a DMRS port corresponding to each layer based on all RIs according to an embodiment of the present disclosure.

[0039] Figure 14 The present invention is a diagram illustrating a mapping relationship between resources used for channel measurement and resources used for interference measurement in a wireless communication system to which the present disclosure may be applied.

[0040] Figures 15 to 17 is a diagram illustrating a mapping relationship between resources for channel measurement and resources for interference measurement according to an embodiment of the present disclosure.

[0041] Figure 18 The diagram illustrates an operation of receiving a CSI-RS configured with multiple different QCL type D reference resources according to an embodiment of the present disclosure.

[0042] Figure 19 Illustrated are resource sets and CSI sets according to an embodiment of the present disclosure.

[0043] Figure 20 Illustrated are CSI sets and resource groups in a resource set according to an embodiment of the present disclosure.

[0044] Figure 21 and Figure 22 Illustrated are CSI sets and resource groups in a resource set according to an embodiment of the present disclosure.

[0045] Figure 23 Illustrated is information about a CDM group and a DMRS port corresponding to each layer based on all RIs according to an embodiment of the present disclosure.

[0046] Figures 24 to 26 is a diagram illustrating a mapping relationship between resources for channel measurement and resources for interference measurement according to an embodiment of the present disclosure.

[0047] Figure 27 The diagram illustrates an operation of receiving a CSI-RS configured with multiple different QCL type D reference resources according to an embodiment of the present disclosure.

[0048] Figure 28 is a diagram illustrating a method for transmitting and receiving channel state information according to an embodiment of the present disclosure.

[0049] Figure 29 is a diagram illustrating an operation of a terminal for transmitting channel state information according to an embodiment of the present disclosure.

[0050] Figure 30 is a diagram illustrating an operation of a base station for receiving channel state information according to an embodiment of the present disclosure.

[0051] Figure 31 is a diagram illustrating a block diagram of a wireless communication device according to an embodiment of the present disclosure.

[0052] Figure 32 A vehicle device according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0053] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed with the accompanying drawings is intended to describe exemplary embodiments of the present disclosure and is not intended to represent the only embodiment in which the present disclosure may be implemented. The following detailed description includes specific details to provide a complete understanding of the present disclosure. However, those skilled in the relevant art will appreciate that the present disclosure may be implemented without these specific details.

[0054] In some cases, well-known structures and devices may be omitted, or may be shown in the form of a block diagram based on the core functions of each structure and device in order to prevent ambiguity in the concepts of the present disclosure.

[0055] In the present disclosure, when an element is referred to as being "connected," "combined," or "linked" to another element, it may include an indirect connection relationship in which another element exists therebetween as well as a direct connection relationship. In addition, in the present disclosure, the terms "comprising" or "having" specify the presence of the mentioned features, steps, operations, components, and / or elements, but do not preclude the presence or addition of one or more other features, steps, operations, components, elements, and / or groups thereof.

[0056] In the present invention, terms such as "first," "second," etc. are used only to distinguish one element from another and are not used to limit the elements. Unless otherwise specified, they do not limit the order or importance of the elements. Therefore, within the scope of the present disclosure, the first element in one embodiment may be referred to as the second element in another embodiment, and similarly, the second element in one embodiment may be referred to as the first element in another embodiment.

[0057] The terms used in this disclosure are intended to describe specific embodiments rather than to limit the claims. As used in the description of the embodiments and the appended claims, the singular is intended to include the plural, unless the context clearly indicates otherwise. The term "and / or" used in this disclosure may refer to one of the relevant enumerated items, or mean that it refers to and includes any and all possible combinations of two or more of them. In addition, unless otherwise indicated, the " / " between words in the present invention has the same meaning as "and / or".

[0058] The present disclosure describes a wireless communication network or a wireless communication system, and operations performed in the wireless communication network can be performed in a process in which a device (e.g., a base station) controlling the corresponding wireless communication network controls the network and sends or receives signals, or can be performed in a process in which a terminal associated with the corresponding wireless network sends or receives signals between the network or the terminal.

[0059] In this disclosure, transmitting or receiving a channel includes the meaning of transmitting or receiving information or signals through the corresponding channel. For example, transmitting a control channel means transmitting control information or control signals through the control channel. Similarly, transmitting a data channel means transmitting data information or data signals through the data channel.

[0060] In the following, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station. The base station may be expressed as a first communication device, and the terminal may be expressed as a second communication device. The base station (BS) may be replaced by terms such as a fixed station, a node B, an eNB (evolved node B), a gNB (next generation node B), a BTS (base transceiver system), an access point (AP), a network (5G network), an AI (artificial intelligence) system / module, an RSU (roadside unit), a robot, a drone (UAV: unmanned aerial vehicle), an AR (augmented reality) device, a VR (virtual reality) device, etc. In addition, the terminal can be fixed or mobile, and can be replaced by terms such as UE (user equipment), MS (mobile station), UT (user terminal), MSS (mobile subscriber station), SS (subscriber station), AMS (advanced mobile station), WT (wireless terminal), MTC (machine type communication) device, M2M (machine to machine) device, D2D (device to device) device, vehicle, RSU (roadside unit), robot, AI (artificial intelligence) module, drone (UAV: unmanned aerial vehicle), AR (augmented reality) device, VR (virtual reality) device, etc.

[0061] The following description can be used for various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented through radio technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented through radio technologies such as GSM (Global System for Mobile Communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented through radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) / LTE-A pro is an advanced version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an advanced version of 3GPP LTE / LTE-A / LTE-A pro.

[0062] To make the description clearer, the description is based on the 3GPP communication system (e.g., LTE-A, NR), but the technical ideas of the present disclosure are not limited thereto. LTE means the technology after 3GPP TS (Technical Specification) 36.xxx Version 8. Specifically, the LTE technology in or after 3GPP TS 36.xxx Version 10 is called LTE-A, and the LTE technology in or after 3GPP TS 36.xxx Version 13 is called LTE-A pro. 3GPP NR means the technology in or after TS 38.xxx Version 15. LTE / NR can be referred to as a 3GPP system. "xxx" means the detailed number of the standard document. LTE / NR can generally be referred to as a 3GPP system. For the background technology, terms, abbreviations, etc. used to describe the present disclosure, reference can be made to the matters described in the standard documents disclosed before the present disclosure. For example, reference can be made to the following documents.

[0063] For 3GPP LTE, reference may be made to TS 36.211 (Physical Channels and Modulation), TS 36.212 (Multiplexing and Channel Coding), TS 36.213 (Physical Layer Procedures), TS 36.300 (General Description), and TS 36.331 (Radio Resource Control).

[0064] For 3GPP NR, you can refer to TS 38.211 (Physical Channels and Modulation), TS 38.212 (Multiplexing and Channel Coding), TS 38.213 (Physical Layer Procedures for Control), TS 38.214 (Physical Layer Procedures for Data), TS 38.300 (NR and NG-RAN (Next Generation Radio Access Network) Overall Description), and TS 38.331 (Radio Resource Control Protocol Specification).

[0065] Abbreviations of terms that may be used in the present disclosure are defined as follows.

[0066] -BM: Beam Management

[0067] -CQI: Channel Quality Indicator

[0068] -CRI: Channel State Information-Reference Signal Resource Indicator

[0069] –CSI: Channel State Information

[0070] -CSI-IM: Channel State Information-Interference Measurement

[0071] -CSI-RS: Channel State Information-Reference Signal

[0072] -DMRS: Demodulation Reference Signal

[0073] –FDM: Frequency Division Multiplexing

[0074] -FFT: Fast Fourier Transform

[0075] -IFDMA: Interleaved Frequency Division Multiple Access

[0076] -IFFT: Inverse Fast Fourier Transform

[0077] -L1-RSRP: Layer 1 reference signal received power

[0078] -L1-RSRQ: Layer 1 Reference Signal Received Quality

[0079] -MAC: Media Access Control

[0080] -NZP: Non-Zero Power

[0081] -OFDM: Orthogonal Frequency Division Multiplexing

[0082] –PDCCH: Physical Downlink Control Channel

[0083] -PDSCH: Physical Downlink Shared Channel

[0084] -PMI: Precoding Matrix Indicator

[0085] -RE: Resource Element

[0086] -RI: rank indicator

[0087] –RRC: Radio Resource Control

[0088] –RSSI: Received Signal Strength Indicator

[0089] -Rx: Receive

[0090] -QCL: Quasi-co-sited

[0091] -SINR: Signal to Interference and Noise Ratio

[0092] -SSB (or SS / PBCH block): Synchronization signal block (including PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) and PBCH (Physical Broadcast Channel))

[0093] -TDM: Time Division Multiplexing

[0094] -TRP: Transmit and Receive Point

[0095] -TRS: Tracking Reference Signal

[0096] -Tx: Send

[0097] -UE: User Equipment

[0098] -ZP: Zero Power

[0099] Overall system

[0100] As more communication devices require higher capacity, there has been a demand for improved mobile broadband communications compared to existing radio access technologies (RATs). In addition, large-scale MTC (machine type communication) that provides various services anytime and anywhere by connecting multiple devices and things is also one of the main issues to be considered in the next generation of communications. In addition, the design of communication systems considering services / terminals that are sensitive to reliability and latency is also discussed. Therefore, the introduction of next-generation RATs considering eMBB (enhanced mobile broadband communication), mMTC (massive MTC), URLLC (ultra-reliable low-latency communication), etc. is discussed, and for convenience, the corresponding technology is referred to as NR in this disclosure. NR is an expression representing an example of 5G RAT.

[0101] The new RAT system including NR uses an OFDM transmission method or a transmission method similar thereto. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system follows the parameters of the existing LTE / LTE-A as is, but may support a wider system bandwidth (e.g., 100 MHz). Alternatively, one cell may support multiple parameter sets. In other words, terminals operating according to different parameter sets may coexist in one cell.

[0102] A parameter set corresponds to one subcarrier spacing in the frequency domain. As the reference subcarrier spacing is scaled by an integer N, different parameter sets can be defined.

[0103] Figure 1 The diagram illustrates the structure of a wireless communication system to which the present disclosure can be applied.

[0104] refer to Figure 1 NG-RAN is configured with gNBs that provide the control plane (RRC) protocol side for the NG-RA (NG Radio Access) user plane (i.e., the new AS (Access Stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and the UE. gNBs are interconnected via the Xn interface. In addition, gNBs are connected to the NGC (Next Generation Core) via the NG interface. More specifically, the gNB is connected to the AMF (Access and Mobility Management Power) via the N2 interface and to the UPF (User Plane Function) via the N3 interface.

[0105] Figure 2 The diagram illustrates a frame structure in a wireless communication system to which the present disclosure may be applied.

[0106] The NR system can support multiple parameter sets. Here, the parameter set can be defined by the subcarrier spacing and the cyclic prefix (CP) overhead. Here, multiple subcarrier spacings can be derived by scaling the basic (reference) subcarrier spacing by an integer N (or, μ). In addition, although it is assumed that very low subcarrier spacing is not used in very high carrier frequencies, the parameter set used can be selected independently of the frequency band. In addition, various frame structures according to multiple parameter sets can be supported in the NR system.

[0107] The following describes the OFDM parameter sets and frame structures that can be considered in the NR system. The multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1 below.

[0108] [Table 1]

[0109] μ <![CDATA[Δf=2 μ ·15[kHz]]]> CP 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0110] NR supports multiple parameter sets (or subcarrier spacing (SCS)) for supporting various 5G services. For example, when the SCS is 15kHz, it supports wide areas of traditional cellular bands; and when the SCS is 30kHz / 60kHz, it supports dense cities, lower latency, and wider carrier bandwidth; and when the SCS is 60kHz or higher, it supports bandwidths exceeding 24.25GHz to overcome phase noise. The NR band is defined as 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).

[0111] [Table 2]

[0112] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0113] Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed as T c =1 / (Δf max ·N f ) is a multiple of the time unit. Here, Δf max i is 480·10 3 Hz, and N f is 4096. Downlink and uplink transmissions are configured (organized) to have duration T f＝ 1 / (Δf max N f / 100)·T c =10ms radio frame. Here, the radio frame is configured with 10 subframes, each of which has T sf =(Δf max N f / 1000)·T c In this case, there may be one frame set for uplink and one frame set for downlink. In addition, the transmission in the uplink frame numbered i from the terminal should start T earlier than the corresponding downlink frame in the corresponding terminal. TA =(N TA +N TA,offset )T c For subcarrier spacing configuration μ, the time slots are arranged in n subframes. s μ ∈{0,...,N slot subframe,μ -1} and are numbered in increasing order in the radio frame by n s,f μ ∈{0,...,N slot frame,μ -1}. A time slot is configured with N symb slotconsecutive OFDM symbols, and N symb slot Determined by CP. Time slot n in a subframe s μ The beginning of the OFDM symbol n in the same subframe s μ N symb slot All terminals may not perform transmission and reception at the same time, which means that all OFDM symbols of a downlink time slot or an uplink time slot may not be used. Table 3 shows the number of OFDM symbols per time slot in a normal CP (N symb slot ), the number of time slots per radio frame (N slot frame,μ ) and the number of time slots per subframe (N slot subframe,μ ), and Table 4 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0114] [Table 3]

[0115] μ <![CDATA[N symb slot ]]> <![CDATA[N slot frame,μ ]]> <![CDATA[N slot subframe,μ ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0116] [Table 4]

[0117] μ <![CDATA[N symb slot ]]> <![CDATA[N slot frame,μ ]]> <![CDATA[N slot subframe,μ ]]> 2 12 40 4

[0118] Figure 2 This is an example of μ=2 (SCS is 60kHz), see Table 3, 1 subframe can include 4 time slots. Figure 2 The 1 subframe = {1, 2, 4} shown in is an example, and the number of time slots that can be included in 1 subframe is defined in Table 3 or Table 4. In addition, a mini-time slot can include 2, 4, or 7 symbols or more or less symbols. Regarding the physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. can be considered. In the following, the physical resources that can be considered in the NR system will be described in detail.

[0119] First, regarding antenna ports, they are defined so that the channel carrying symbols in that antenna port can be inferred from the channels carrying other symbols in the same antenna port. When large-scale properties of the channel carrying symbols in one antenna port can be inferred from the channel carrying symbols in another antenna port, the two antenna ports are said to be in a QC / QCL (quasi-co-located or quasi-co-located) relationship. In this case, the large-scale properties include at least one of delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0120] Figure 3The diagram illustrates a resource grid in a wireless communication system to which the present disclosure may be applied.

[0121] refer to Figure 3 , which graphically depicts the resource grid configuration with N in the frequency domain RB μ N sc RB subcarriers, and one subframe is configured with 14·2 μ OFDM symbols, but not limited to this. In the NR system, the transmitted signal consists of 2 μ N symb (μ) OFDM symbols and N RB μ N sc RB Here, N RB μ ≤N RB max,μ . N RB max,μ represents the maximum transmission bandwidth, which may differ between uplink and downlink and between parameter sets. In this case, one resource grid can be configured for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is called a resource element and is uniquely identified by an index pair (k, l'). Here, k = 0, ..., N RB μ N sc RB -1 is the index in the frequency domain, and l'=0,...,2 μ N symb (μ) -1 refers to the symbol position in the subframe. When referring to resource elements in a time slot, an index pair (k, l) is used. Here, l = 0, ..., N symb μ -1. The resource element (k, l') for μ and antenna port p corresponds to the complex value a k,l' (p,μ) When there is no risk of confusion or when no specific antenna port or parameter set is specified, the indices p and μ may be dropped and the complex value may be a k,l' (p) or a k,l' In addition, a resource block (RB) is defined as N in the frequency domain. sc RB =12 consecutive subcarriers.

[0122] Point A serves as a common reference point for the resource block grid and is obtained as follows.

[0123] -OffsetToPointA for the primary cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block, which is used by the terminal for initial cell selection. Assuming a subcarrier spacing of 15 kHz for FR1 and 60 kHz for FR2, it is expressed in resource blocks.

[0124] -absoluteFrequencyPointA represents the frequency position of point A, expressed in ARFCN (Absolute Radio Frequency Channel Number).

[0125] For subcarrier spacing configuration μ, common resource blocks are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ is the same as "point A". Common resource block number n for subcarrier spacing configuration μ in the frequency domain CRB μ The relationship between and resource elements (k, l) is given by the following formula 1.

[0126] [Formula 1]

[0127]

[0128] In Equation 1, k is defined relative to point A, so that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are numbered from 0 to N in a bandwidth part (BWP). BWP,i size,μ -1 numbering and i is the number of BWP. Physical resource block n in BWP i PRB and public resource block n CRB The relationship between is given by the following formula 2.

[0129] [Formula 2]

[0130]

[0131] N BWP,i start,μ is the common resource block where the BWP starts relative to common resource block 0.

[0132] Figure 4 The figure illustrates a physical resource block in a wireless communication system to which the present disclosure may be applied. Figure 5 The diagram illustrates a time slot structure in a wireless communication system to which the present disclosure may be applied.

[0133] refer to Figure 4 and Figure 5 , a slot includes multiple symbols in the time domain. For example, for a normal CP, 1 slot includes 7 symbols, but for an extended CP, 1 slot includes 6 symbols.

[0134] A carrier includes 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 parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed through activated BWPs, and only one BWP can be activated for a terminal. In the resource grid, each element is called a resource element (RE) and can map a complex symbol.

[0135] In the NR system, each component carrier (CC) can support up to 400MHz. If a terminal operating in such a wideband CC always operates to turn on the radio frequency (FR) chip for the entire CC, the terminal battery consumption may increase. Alternatively, when considering multiple application scenarios operating in one wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different parameter sets (e.g., subcarrier spacing, etc.) can be supported in each frequency band in the corresponding CC. Alternatively, each terminal may have different capabilities for the maximum bandwidth. Taking this into account, the base station can instruct the terminal to operate only in part of the bandwidth instead of the full bandwidth of the wideband CC, and for convenience, the corresponding part of the bandwidth is defined as a bandwidth part (BWP). The BWP can be configured with continuous RBs on the frequency axis and can correspond to a parameter set (e.g., subcarrier spacing, CP length, slot / mini-slot duration).

[0136] Furthermore, even within a CC assigned to a terminal, a base station can configure multiple BWPs. For example, a BWP occupying a relatively small frequency domain can be configured in the PDCCH monitoring timeslot, while the PDSCH indicated by the PDCCH can be scheduled in a larger BWP. Alternatively, when a UE is congested in a specific BWP, other BWPs can be configured for some terminals for load balancing. Alternatively, to account for frequency-domain inter-cell interference cancellation between neighboring cells, some full-bandwidth middle spectrum can be excluded, and two edge BWPs can be configured in the same timeslot. In other words, a 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 of the configured DL / UL BWPs at a specific time (via L1 signaling, MAC CE (Control Element), RRC signaling, etc.). Furthermore, the base station can instruct (via L1 signaling, MAC CE, RRC signaling, etc.) to switch to another configured DL / UL BWP. Alternatively, a timer can be used to switch to a specific DL / UL BWP upon expiration of the timer value. Here, the activated DL / UL BWP is defined as the active DL / UL BWP. However, when the terminal performs the initial access procedure or establishes the RRC connection, the configuration on the DL / UL BWP may not be received, so the DL / UL BWP assumed by the terminal in these cases is defined as the initial active DL / UL BWP.

[0137] Figure 6 Physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the physical channels are illustrated.

[0138] In wireless communication systems, terminals receive information from base stations via downlinks and transmit information to base stations via uplinks. The information transmitted and received by base stations and terminals includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and receive.

[0139] When a terminal is turned on or newly enters a cell, it performs an initial cell search (S601), including synchronization with the base station. During the initial cell search, the terminal can synchronize with the base station by receiving the Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) from the base station and obtain information such as the cell identifier (ID). The terminal can then obtain broadcast information in the cell by receiving the Physical Broadcast Channel (PBCH) from the base station. Simultaneously, the terminal can check the downlink channel status by receiving the Downlink Reference Signal (DL RS) during the initial cell search phase.

[0140] The terminal that has completed the initial cell search may obtain more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried in the PDCCH (S602).

[0141] Meanwhile, when a terminal first accesses a base station or has no radio resources for signal transmission, it may perform a random access (RACH) procedure on the base station (S603 to S606). For the random access procedure, the terminal may transmit a specific sequence as a preamble via a physical random access channel (PRACH) (S603 and S605), and may receive a response message to the preamble via the PDCCH and corresponding PDSCH (S604 and S606). The contention-based RACH may also perform a contention resolution procedure.

[0142] The terminal that then performs the above process can perform PDCCH / PDSCH reception (S607) and PUSCH (Physical Uplink Shared Channel) / PUCCH (Physical Uplink Control Channel) transmission (S608) as a general uplink / downlink signal transmission process. Specifically, the terminal receives downlink control information (DCI) via the PDCCH. Here, DCI includes control information such as resource allocation information for the terminal, and its format varies depending on its purpose of use.

[0143] At the same time, the control information sent by the terminal to the base station via the uplink or received by the terminal 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. For the 3GPP LTE system, the terminal can send the above-mentioned CQI / PMI / RI and other control information through PUSCH and / or PUCCH.

[0144] Table 5 shows an example of the DCI format in the NR system.

[0145] [Table 5]

[0146]

[0147] Referring to Table 5, DCI formats 0_0, 0_1, and 0_2 may include resource information (e.g., UL / SUL (supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), information related to transport blocks (TBs) (e.g., MCS (Modulation and Coding Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), information related to HARQ (Hybrid Automatic Repeat and Request) (e.g., process number, DAI (Downlink Assignment Index), PDSCH-HARQ feedback timing, etc.), information related to multi-antennas (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information related to PUSCH scheduling (e.g., PUSCH power control, etc.), and control information included in each DCI format may be predefined. DCI format 0_0 is used to schedule PUSCH in one cell. Information included in DCI format 0_0 is CRC (Cyclic Redundancy Check) scrambled by C-RNTI (Cell Radio Network Temporary Identifier) ​​or CS-RNTI (Configured Scheduling RNTI) or MCS-C-RNTI (Modulation and Coding Scheme Cell RNTI) and transmitted.

[0148] DCI format 0_1 ​​is used to indicate the scheduling of one or more PUSCHs or to configure grant (CG) downlink feedback information to terminals in a cell. The information included in DCI format 0_1 ​​is scrambled and transmitted by C-RNTI, CS-RNTI, SP-CSI-RNTI (semi-persistent CSI RNTI), or MCS-C-RNTI.

[0149] DCI format 0_2 is used to schedule a PUSCH in one cell. Information included in DCI format 0_2 is scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI and transmitted.

[0150] Next, DCI formats 1_0, 1_1 and 1_2 may include resource information (e.g., frequency resource allocation, time resource allocation, VRB (virtual resource block)-PRB (physical resource block) mapping, etc.), information related to transport blocks (TBs) (e.g., MCS, NDI, RV, etc.), information related to HARQ (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), information related to multiple antennas (e.g., antenna ports, TCI (transmission configuration indicator), SRS (sounding reference signal) request, etc.), information related to PUCCH scheduling regarding PDSCH (e.g., PUCCH power control, PUCCH resource indicator, etc.), and the control information included in each DCI format may be predefined.

[0151] DCI format 1_0 is used to schedule a PDSCH in one DL cell. Information included in DCI format 1_0 is a CRC scrambled and transmitted by a C-RNTI, a CS-RNTI, or an MCS-C-RNTI.

[0152] DCI format 1_1 is used to schedule a PDSCH in one cell. Information included in DCI format 1_1 is a CRC scrambled and transmitted by a C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0153] DCI format 1_2 is used to schedule PDSCH in a cell. The information included in DCI format 1_2 is a CRC scrambled and transmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0154] CSI-related operations

[0155] In NR (New Radio) systems, CSI-RS (Channel State Information - Reference Signal) is used for time and / or frequency tracking, CSI calculation, L1 (Layer 1)-RSRP (Reference Signal Received Power) calculation, and mobility. Here, CSI calculation is related to CSI acquisition, and L1-RSRP calculation is related to beam management (BM).

[0156] CSI (Channel State Information) generally refers to information that can indicate the quality of a radio channel (or also referred to as a link) formed between a terminal and an antenna port.

[0157] -To perform one of the uses of CSI-RS, a terminal (e.g., user equipment, UE) receives CSI-related configuration information from a base station (e.g., generalized Node B, gNB) through RRC (Radio Resource Control) signaling.

[0158] The CSI-related configuration information may include at least one of information related to CSI-IM (interference management) resources, information related to CSI measurement configuration, information related to CSI resource configuration, information related to CSI-RS resources, or information related to CSI reporting configuration.

[0159] i) Information related to CSI-IM resources may include CSI-IM resource information, CSI-IM resource set information, etc. A CSI-IM resource set is identified by a CSI-IM resource set ID (identifier), and a resource set includes at least one CSI-IM resource. Each CSI-IM resource is identified by a CSI-IM resource ID.

[0160] ii) Information related to CSI resource configuration can be expressed as CSI-ResourceConfig IE. The information related to CSI resource configuration defines a group including at least one of an NZP (non-zero power) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resource set. In other words, the information related to CSI resource configuration may include a CSI-RS resource set list, and the CSI-RS resource set list may include at least one of an NZP CSI-RS resource set list, a CSI-IM resource set list, or a CSI-SSB resource set list. A CSI-RS resource set is identified by a CSI-RS resource set ID, and one resource set includes at least one CSI-RS resource. Each CSI-RS resource is identified by a CSI-RS resource ID.

[0161] Parameters indicating the usage of CSI-RS (eg, a "repeat" parameter related to BM, a "trs-Info" parameter related to tracking) may be configured per NZP CSI-RS resource set.

[0162] iii) Information related to CSI reporting configuration includes a reportConfigType parameter indicating the time domain behavior and a reportQuantity parameter indicating the CSI-related quantity to be reported. The time domain behavior can be periodic, aperiodic, or semi-persistent.

[0163] -The terminal measures CSI based on the CSI-related configuration information.

[0164] The CSI measurement may include (1) a process in which the terminal receives a CSI-RS and (2) a process in which the CSI is calculated through the received CSI-RS, and a detailed description thereof will be described later.

[0165] For CSI-RS, the RE (resource element) mapping of CSI-RS resources in the time domain and frequency domain is configured by the higher-layer parameter CSI-RS-ResourceMapping.

[0166] -The terminal reports the measured CSI to the base station.

[0167] In this case, when the quantity of CSI-ReportConfig is configured as "None (or No Report)", the terminal can omit reporting. However, even if the quantity is configured as "None (or No Report)", the terminal can still report to the base station. When the quantity is configured as "None", an aperiodic TRS is triggered or repetition is configured. In this case, the terminal can omit reporting only when repetition is configured as "On".

[0168] CSI measurement

[0169] The NR system supports more flexible and dynamic CSI measurement and reporting. Here, CSI measurement can include the process of receiving CSI-RS and obtaining CSI by calculating the received CSI-RS.

[0170] As time domain behaviors for CSI measurement and reporting, aperiodic / semi-persistent / periodic CM (channel measurement) and IM (interference measurement) are supported. A 4-port NZP CSI-RS RE pattern is used for CSI-IM configuration.

[0171] NR's CSI-IM-based IMR has a design similar to LTE's CSI-IM and is configured independently of the ZP CSI-RS resources used for PDSCH rate matching. In addition, each port simulates the interference layer with (desired channel and) precoded NZP CSI-RS in the NZP CSI-RS-based IMR. Since this is an intra-cell interference measurement for multi-user situations, it mainly targets MU interference.

[0172] The base station sends the precoded NZP CSI-RS to the terminal in each port of the configured NZP CSI-RS based IMR.

[0173] The terminal assumes a channel / interference floor and measures the interference for each port in the resource set.

[0174] When there is no PMI and RI feedback for a channel, multiple resources are configured in a set, and the base station or network indicates a subset of NZP CSI-RS resources through DCI for channel / interference measurement.

[0175] Describes resource settings and resource setting configuration in more detail.

[0176] Resource Settings

[0177] Each CSI resource setting "CSI-ResourceConfig" includes the configuration for S ≥ 1 CSI resource sets (given by the higher layer parameter csi-RS-ResourceSetList). A CSI resource setting corresponds to CSI-RS-resourcesetlist. Here, S represents the number of configured CSI-RS resource sets. Here, the configuration of S ≥ 1 CSI resource sets includes each CSI resource set and the SS / PBCH block (SSB) resources used for L1-RSRP calculation, and each CSI resource set includes CSI-RS resources (configured with NZP CSI-RS or CSI-IM).

[0178] Each CSI resource setting is located at a DL BWP (bandwidth part) identified by a higher layer parameter bwp-id. In addition, all CSI resource settings linked to a CSI reporting setting have the same DL BWP.

[0179] The time domain behavior of the CSI-RS resources in the CSI resource settings included in the CSI-ResourceConfig IE can be indicated by the higher layer parameter resourceType and can be configured as aperiodic, periodic, or semi-persistent. For periodic and semi-persistent CSI resource settings, the number of configured CSI-RS resource sets is limited to "1". For periodic and semi-persistent CSI resource settings, the configured periodicity and slot offset are given by the parameter set of the associated DL BWP, as given by bwp-id.

[0180] When a UE is configured with multiple CSI-ResourceConfigs including the same NZP CSI-RS resource ID, the same time-domain behavior is configured for the CSI-ResourceConfigs.

[0181] When a UE is configured with multiple CSI-ResourceConfigs including the same CSI-IM resource ID, the same time domain behavior is configured for the CSI-ResourceConfigs.

[0182] One or more CSI resource settings for channel measurement (CM) and interference measurement (IM) are configured through higher layer signaling as follows.

[0183] -CSI-IM resources for interference measurement

[0184] -NZP CSI-RS resources for interference measurement

[0185] -NZP CSI-RS resources for channel measurement

[0186] In other words, CMR (channel measurement resource) may be an NZP CSI-RS for CSI acquisition, and IMR (interference measurement resource) may be an NZP CSI-RS for CSI-IM and IM.

[0187] In this case, CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.

[0188] In addition, the NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multiple users.

[0189] The UE may assume that the CSI-RS resource(s) used for channel measurement and the CSI-IM / NZP CSI-RS resource(s) used for interference measurement configured for one CSI report are “QCL-Type D” per resource.

[0190] Resource Settings Configuration

[0191] As mentioned, a resource setting may refer to a list of resource sets.

[0192] For aperiodic CSI, each trigger state configured using the higher layer parameter CSI-AperiodicTriggerState is associated with one or more CSI-ReportConfigs, each CSI-ReportConfig being linked to a periodic, semi-persistent or aperiodic resource setting.

[0193] One report setup can be linked to up to 3 resource setups.

[0194] - When configuring a resource setting, the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is about the channel measurement used for L1-RSRP calculation.

[0195] - When two resource settings are configured, the first resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is used for channel measurement, and the second resource setting (given by csi-IM-ResourcesForInterference or nzp-CSI-RS-ResourcesForInterference) is used for interference measurement performed in CSI-IM or NZP CSI-RS.

[0196] -When three resource settings are configured, the first resource setting (given by resourcesForChannelMeasurement) is used for channel measurement, the second resource setting (given by csi-IM-ResourcesForInterference) is used for CSI-IM based interference measurement, and the third resource setting (given by nzp-CSI-RS-ResourcesForInterference) is used for NZP CSI-RS based interference measurement.

[0197] For semi-persistent or periodic CSI, each CSI-ReportConfig is linked to a periodic or semi-persistent resource setting.

[0198] - When a resource setting is configured (given by resourcesForChannelMeasurement), the resource setting is about the channel measurement used for L1-RSRP calculation.

[0199] - When two resource settings are configured, the first resource setting (given by resourcesForChannelMeasurement) is used for channel measurement, and the second resource setting (given by the higher layer parameter csi-IM-ResourcesForInterference) is used for interference measurement performed in CSI-IM.

[0200] CSI calculation

[0201] When performing interference measurement in CSI-IM, each CSI-RS resource used for channel measurement is associated with a CSI-IM resource per resource in the order of the CSI-RS resources and CSI-IM resources in the corresponding resource set. The number of CSI-RS resources used for channel measurement is the same as the number of CSI-IM resources.

[0202] Additionally, when performing interference measurement in NZP CSI-RS, the UE does not expect to be configured with one or more NZP CSI-RS resources in the associated resource set in the resource setting for channel measurement.

[0203] A terminal configured with the higher layer parameter nzp-CSI-RS-ResourcesForInterference is not expected to have 18 or more NZP CSI-RS ports configured in the NZP CSI-RS resource set.

[0204] For CSI measurement, the terminal assumes the following.

[0205] - Each NZP CSI-RS port configured for interference measurement corresponds to an interfering transmission layer.

[0206] - Consider the EPRE (Energy Per Resource Element) ratio of all interfering transmission layers of the NZP CSI-RS port for interference measurement.

[0207] - Different interference signals in REs of NZP CSI-RS resources for channel measurement, NZP CSI-RS resources for interference measurement, or CSI-IM resources for interference measurement

[0208] CSI Report

[0209] For CSI reporting, the time and frequency resources that the UE can use are controlled by the base station.

[0210] CSI (Channel State Information) may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), or L1-RSRP.

[0211] For CQI, PMI, CRI, SSBRI, LI, RI, L1-RSRP, the terminal is configured by a higher layer with N≥1 CSI-ReportConfig reporting settings, M≥1 CSI-ResourceConfig resource settings and a list of one or two trigger states (provided by aperiodicTriggerStateList and semiPersistentOnPUSCH-TriggerStateList). Each trigger state in aperiodicTriggerStateList includes an associated CSI-ReportConfig list, which indicates the channel and optional resource set ID for interference. In semiPersistentOnPUSCH-TriggerStateList, an associated CSI-ReportConfig is included in each trigger state.

[0212] In addition, the time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic.

[0213] i) Periodic CSI reporting is performed in the short PUCCH and the long PUCCH. The periodicity and slot offset of the periodic CSI reporting can be configured by RRC and refer to the CSI-ReportConfig IE.

[0214] ii) SP (semi-periodic) CSI reporting is performed in short PUCCH, long PUCCH or PUSCH.

[0215] For SP CSI in short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is activated / deactivated by a separate MAC CE / DCI.

[0216] For SP CSI in PUSCH, the periodicity of SP CSI reporting is configured by RRC, but the slot offset is not configured by RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). For SP CSI reporting in PUSCH, a separate RNTI (SP-CSI C-RNTI) is used.

[0217] The initial CSI reporting timing follows the PUSCH time domain allocation value indicated by the DCI, and the subsequent CSI reporting timing follows the periodicity configured by the RRC.

[0218] DCI format 0_1 ​​may include a CSI request field and activate / deactivate a specific configured SP-CSI triggering state. SP CSI reporting has the same or similar activation / deactivation mechanism as data transmission in SPS PUSCH.

[0219] iii) Aperiodic CSI reporting is performed in PUSCH and triggered by DCI. In this case, information related to the triggering of aperiodic CSI reporting can be delivered / indicated / configured through MAC-CE.

[0220] For AP CSI with AP CSI-RS, AP CSI-RS timing is configured by RRC and the timing for AP CSI reporting is dynamically controlled by DCI.

[0221] In NR, the method of dividing and reporting CSI in multiple reporting instances applied to PUCCH-based CSI reporting in LTE (for example, transmitted in the order of RI, WB PMI / CQI, SB PMI / CQI) is not applied. On the contrary, in NR, there is a restriction that no specific CSI report is configured in short / long PUCCH and CSI omission rules are defined. In addition, with respect to AP CSI reporting timing, the PUSCH symbol / slot position is dynamically indicated by DCI. In addition, the candidate slot offset is configured by RRC. For CSI reporting, the slot offset (Y) is configured per report setting. For UL-SCH, the slot offset K2 is configured separately.

[0222] Two CSI latency categories (low latency category and high latency category) are defined with respect to CSI computation complexity. Low latency CSI is WB CSI, which includes a Type-I codebook of up to 4 ports or non-PMI feedback CSI of up to 4 ports. High latency CSI refers to CSI other than low latency CSI. For ordinary terminals, (Z, Z') are defined in units of OFDM symbols. Here, Z represents the minimum CSI processing time from the receipt of the non-periodic CSI that triggers DCI until the CSI report is performed. In addition, Z' refers to the minimum CSI processing time from the receipt of the CSI-RS for the channel / interference until the CSI report is performed.

[0223] In addition, the terminal reports the number of CSIs that can be calculated simultaneously.

[0224] Quasi-co-sited (QCL)

[0225] Antenna ports are defined so that the channel over which symbols are transmitted on that antenna port can be inferred from the channels over which other symbols are transmitted on the same antenna port. When the properties of the channel carrying symbols from one antenna port can be inferred from the channel carrying symbols from another antenna port, the two antenna ports are said to be in a QC / QCL (quasi-co-located or quasi-co-located) relationship.

[0226] Here, the channel attributes include at least one of delay spread, Doppler spread, frequency / Doppler shift, average received power, receive timing / average delay, or spatial RX parameters. Here, spatial Rx parameters refer to spatial (Rx) channel attribute parameters such as arrival angle.

[0227] A terminal may be configured in a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config to decode PDSCH based on a detected PDCCH with expected DCI for the terminal and a given serving cell. M depends on the UE capabilities.

[0228] Each TCI-State includes parameters for configuring a quasi-co-location relationship between one or two ports of a DL reference signal and a DM-RS of a PDSCH.

[0229] The quasi co-location relationship is configured by the higher layer parameter qcl-Type1 for the first DL RS and qcl-Type2 (if configured) for the second DL RS. For two DL RSs, the QCL type is different regardless of whether the reference is the same DL RS or different DL RSs.

[0230] The quasi-colocation type corresponding to each DL RS is given by the higher-layer parameter qcl-Type of QCL-Info and can take one of the following values.

[0231] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0232] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0233] - "QCL-TypeC": {Doppler shift, average delay}

[0234] - "QCL-TypeD": {spatial Rx parameters}

[0235] For example, when the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna port may be instructed / configured to be quasi-co-located with a specific TRS for QCL-Type A and quasi-co-located with a specific SSB for QCL-Type D. The terminal receiving such an instruction / configuration can receive the corresponding NZP CSI-RS by using the Doppler delay value measured in the QCL-Type A TRS and applying the Rx beam for receiving the QCL-Type D SSB to the reception of the corresponding NZP CSI-RS.

[0236] The UE may receive the activation command via MAC CE signaling, which is used to map up to 8 TCI states to code points of the DCI field "Transmission Configuration Indication".

[0237] Operations related to multiple TRPs

[0238] The Coordinated Multi-Point (CoMP) scheme is a scheme in which multiple base stations exchange or utilize channel information (e.g., RI / CQI / PMI / LI (layer indicator)) fed back by a terminal (e.g., using the X2 interface) and cooperatively transmit it to the terminal to effectively control interference. Depending on the scheme used, CoMP can be categorized into joint transmission (JT), coordinated scheduling (CS), coordinated beamforming (CB), dynamic point selection (DPS), dynamic point blocking (DPB), etc.

[0239] The M-TRP transmission scheme in which M TRPs send data to one terminal can be mainly classified into i) eMBB M-TRP transmission, a scheme for improving the transmission rate, and ii) URLLC M-TRP transmission, a scheme for increasing the reception success rate and reducing the delay.

[0240] In addition, regarding DCI transmission, M-TRP transmission schemes can be classified into i) M-TRP transmission based on M-DCI (multiple DCIs), where each TRP transmits different DCIs, and ii) M-TRP transmission based on S-DCI (single DCI), where one TRP transmits DCI. For example, for S-DCI-based M-TRP transmission, all scheduling information about data transmitted by M TRPs should be delivered to the terminal through one DCI, which can be used in an ideal backhaul (ideal BH) environment where dynamic collaboration between two TRPs is possible.

[0241] For TDM-based URLLC M-TRP transmission, Schemes 3 / 4 are being discussed for standardization. Specifically, Scheme 4 refers to a scheme in which one TRP transmits a transport block (TB) in one time slot, and has the effect of increasing the probability of data reception by receiving the same TB from multiple TRPs in multiple time slots. Meanwhile, Scheme 3 refers to a scheme in which one TRP transmits a TB through a continuous number of OFDM symbols (i.e., a symbol group), and the TRP can be configured to transmit the same TB through different symbol groups in one time slot.

[0242] In addition, the UE can identify the PUSCH (or PUCCH) scheduled by the DCI received in different control resource sets (CORESETs) (or CORESETs belonging to different CORESET groups) as the PUSCH (or PUCCH) sent to different TRPs, or can identify the PDSCH (or PDCCH) from different TRPs. In addition, the method described below for UL transmissions (e.g., PUSCH / PUCCH) sent to different TRPs can be equivalently applied to UL transmissions (e.g., PUSCH / PUCCH) sent to different panels belonging to the same TRP.

[0243] In addition, MTRP-URLLC may refer to M TRPs sending the same transport block (TB) by using different layers / times / frequencies. A UE configured with the MTRP-URLLC transmission scheme receives indications about multiple TCI states through DCI and may assume that the data received by using the QCL RS of each TCI state is the same TB. On the other hand, MTRP-eMBB may refer to M TRPs sending different TBs by using different layers / times / frequencies. A UE configured with the MTRP-eMBB transmission scheme receives indications about multiple TCI states through DCI and may assume that the data received by using the QCL RS of each TCI state is a different TB. In this regard, since the UE classifies and uses the RNTI configured for MTRP-URLLC and the RNTI configured for MTRP-eMBB respectively, it can decide / determine whether the corresponding M-TRP transmission is URLLC transmission or eMBB transmission. In other words, when CRC masking of the DCI received by the UE is performed by using the RNTI configured for MTRP-URLLC, it may correspond to URLLC transmission, and when CRC masking of the DCI is performed by using the RNTI configured for MTRP-eMBB, it may correspond to eMBB transmission.

[0244] Hereinafter, the CORESET group ID described / mentioned in the present disclosure may refer to an index / identification information (e.g., ID, etc.) of a CORESET that is distinguished for each TRP / panel. In addition, a CORESET group may be a group / union of CORESETs that are distinguished by an index / identification information (e.g., ID) / CORESET group ID, etc. that is distinguished for each TRP / panel. In an example, the CORESET group ID may be specific index information defined in the CORESET configuration. In this case, the CORESET group may be configured / indicated / defined by an index defined in the CORESET configuration for each CORESET. Additionally / alternatively, the CORESET group ID may refer to an index / identification information / indicator, etc. that is used to distinguish / identify between CORESETs that are configured / associated with each TRP / panel. Hereinafter, the CORESET group ID described / mentioned in the present disclosure may be represented by being replaced with a specific index / specific identification information / specific indicator that is used to distinguish / identify between CORESETs that are configured / associated with each TRP / panel. The CORESET group ID, i.e., a specific index / specific identification information / specific indicator for distinguishing / identifying between CORESETs configured / associated with each TRP / panel, may be configured / indicated to the terminal through higher layer signaling (e.g., RRC signaling) / L2 signaling (e.g., MAC-CE) / L1 signaling (e.g., DCI), etc. In an example, it may be configured / indicated that PDCCH detection is performed per TRP / panel (i.e., per TRP / panel belonging to the same CORESET group) in units of the corresponding CORESET group. Additionally / alternatively, it may be configured / indicated that uplink control information (e.g., CSI, HARQ-A / N (ACK / NACK), SR (scheduling request)) and / or uplink physical channel resources (e.g., PUCCH / PRACH / SRS resources) are separated and managed / controlled per TRP / panel (i.e., per TRP / panel belonging to the same CORESET group) in units of the corresponding CORESET group. Additionally / alternatively, HARQ A / N (processing / retransmission) for PDSCH / PUSCH, etc. scheduled per TRP / panel may be managed per corresponding CORESET group (ie, per TRP / panel belonging to the same CORESET group).

[0245] For example, a higher layer parameter ControlResourceSet information element (IE) is used to configure a time / frequency control resource set (CORESET). In an example, the control resource set (CORESET) may be related to the detection and reception of downlink control information. The ControlResourceSet IE may include an ID related to the CORESET (e.g., controlResourceSetID) / an index of a CORESET pool for the CORESET (e.g., CORESETPoolIndex) / time / frequency resource configuration of the CORESET / TCI information related to the CORESET, etc. In an example, the index of the CORESET pool (e.g., CORESETPoolIndex) may be configured as 0 or 1. In the description, a CORESET group may correspond to a CORESET pool, and a CORESET group ID may correspond to a CORESET pool index (e.g., CORESETPoolIndex).

[0246] NCJT (Non-coherent Joint Transmission) is a scheme in which multiple transmission points (TPs) transmit data to one terminal by using the same time-frequency resources, and the TPs transmit data through different layers (i.e., through different DMRS ports) using different DMRS (Demodulation Multiplexing Reference Signals) between TPs.

[0247] TP delivers data scheduling information to the terminal receiving NCJT through DCI. Here, a scheme in which each TP participating in NCJT delivers scheduling information about the data sent by itself through DCI is called "NCJT based on multiple DCIs". Since each of the N TPs participating in NCJT transmission sends DL grant DCI and PDSCH to the UE, the UE receives N DCIs and N PDSCHs from the N TPs. At the same time, a scheme in which one representative TP delivers scheduling information about the data sent by itself and the data sent by different TPs (i.e., TPs participating in NCJT) through one DCI is called "NCJT based on a single DCI". Here, N TPs send one PDSCH, but each TP sends only some layers of the multiple layers included in one PDSCH. For example, when sending 4 layers of data, TP 1 can send 2 layers to the UE, and TP 2 can send the remaining 2 layers to the UE.

[0248] Hereinafter, a partially overlapping NCJT will be described.

[0249] In addition, NCJT can be classified into fully overlapping NCJT in which the time-frequency resources transmitted by each TP completely overlap, and partially overlapping NCJT in which only some time-frequency resources overlap. In other words, for partially overlapping NCJT, data of both TP 1 and TP 2 is transmitted in some time-frequency resources, and data of only one TP, TP 1 or TP 2, is transmitted in the remaining time-frequency resources.

[0250] Hereinafter, a method for improving reliability in multi-TRP will be described.

[0251] As a sending and receiving method for improving reliability using transmission in multiple TRPs, the following two methods can be considered.

[0252] Figure 7 The diagram illustrates a method for multi-TRP transmission in a wireless communication system to which the present disclosure can be applied.

[0253] refer to Figure 7 (a) shows a case where layer groups transmitting the same codeword (CW) / transport block (TB) correspond to different TRPs. Here, a layer group may refer to a predetermined set of layers including one or more layers. In this case, there are the following advantages: the amount of transmission resources increases due to the number of layers, so that robust channel coding with a low coding rate can be used for the TBs, and additionally, because the multiple TRPs have different channels, the reliability of the received signal can be expected to be improved due to diversity gain.

[0254] refer to Figure 7 (b) shows an example of sending different CWs through layer groups corresponding to different TRPs. Here, it can be assumed that the TBs corresponding to CW#1 and CW#2 in the figure are the same. In other words, CW#1 and CW#2 refer to the same TBs that are transformed into different CWs by different TRPs through channel coding, etc. Therefore, it can be regarded as an example of repeatedly sending the same TB. Figure 7 (b) In the case of Figure 7 Compared with (a), the disadvantage is that the code rate corresponding to the TB is higher. However, the advantage is that the code rate can be adjusted by indicating different RV (Redundancy Version) values, or the modulation order of each CW of the coded bits generated by the same TB can be adjusted according to the channel environment.

[0255] According to the above Figure 7 (a) and Figure 7The method shown in (b) can improve the data reception probability of the terminal because the same TB is repeatedly sent through different layer groups, and each layer group is sent by a different TRP / panel. It is called the M-TRP URLLC transmission method based on SDM (spatial division multiplexing). Layers belonging to different layer groups are transmitted separately through DMRS ports belonging to different DMRS CDM groups.

[0256] In addition, the above content related to multiple TRPs is described based on the SDM (spatial division multiplexing) method using different layers, but it can be naturally extended and applied to the FDM (frequency division multiplexing) method based on different frequency domain resources (e.g., RB / PRB (sets), etc.) and / or the TDM (time division multiplexing) method based on different time domain resources (e.g., time slots, symbols, sub-symbols, etc.).

[0257] Method for sending and receiving channel state information

[0258] According to the CSI (channel state information) framework currently defined in the Rel-15 / 16 standard, the terminal may not be able to obtain / report the joint CSI of CSI-RS resources sent from different TRPs / panels. For example, when TRP 1 / 2 is assumed, the terminal can obtain / report CSI (e.g., CRI / RI / PMI / CQI, etc.) for each of TRP 1 and TRP2, but cannot obtain / report CSI (e.g., CRI / RI / PMI / CQI, etc.) suitable for multi-TRP transmission by considering TRP 1 / 2 together. Therefore, an operation that can support multi-TRP transmission (e.g., for NCJT / URLLC) is newly introduced in Rel-16, but there is a disadvantage that random parameters should be applied to link adaptation because the base station does not know the optimal CSI for performing multi-TRP transmission. If the terminal can obtain / report CSI suitable for multi-TRP transmission by considering multi-TRP transmission (e.g., for NCJT / URLLC), the system performance can be improved by performing more appropriate link adaptation when performing multi-TRP transmission.

[0259] In the present disclosure, a method is proposed in which a terminal can acquire / report CSI suitable for multi-TRP transmission by considering multi-TRP transmission (e.g., for NCJT / URLLC).

[0260] Hereinafter, in the present disclosure, for the convenience of description, it is assumed that two TRPs (eg, TRP 1 / TRP 2) operate. However, this assumption does not limit the technical scope of the present disclosure.

[0261] The description as TRP in this disclosure is for convenience of description, which can obviously be interpreted as terms such as panel / beam, etc.

[0262] In the present disclosure, L1 signaling may refer to dynamic signaling based on DCI between a base station and a terminal, and L2 signaling may refer to higher layer signaling based on RRC / MAC CE (Control Element) between a base station and a terminal.

[0263] A higher layer parameter 'CSI-ReportConfig' for configuring a CSI reporting method is defined in the TS 38.331 standard, and some parameters are defined as shown in the following Table 6. Hereinafter, for convenience of description, 'CSI-ReportConfig' may be referred to as a reporting setting.

[0264] [Table 6]

[0265]

[0266] refer to Figure 6 A reporting setting can include up to three "CSI-ResourceConfigs." For convenience, a "CSI-ResourceConfig" can be referred to as a resource setting. TS 38.214 defines the usage of each resource setting based on the temporal behavior of the reporting setting and the number of resource settings configured in the reporting setting, as shown in Table 7 below.

[0267] [Table 7]

[0268]

[0269] As described above, one resource setting can be configured for channel measurement (CM) for aperiodic (AP) CSI. Additionally, one resource setting can be configured for CM for semi-persistent or periodic CSI. As defined in TS 38.214, for P / SP CSI resource settings, the number of CSI-RS resource sets that can be configured for a resource setting is limited to one. For AP CSI resource settings, multiple CSI-RS resource sets can be configured, but when configuring the trigger state, one of the multiple resource sets is selected for each reporting setting.

[0270] As described above, in the current standard, one resource setting for CM can be configured per reporting setting. Therefore, when only one resource setting for CM is configured per reporting setting according to the current standard, it is necessary for the terminal to be able to perform CM for each different TRP and a method for interference measurement (IM) generated between different TRPs by using the CSI-RS resources defined in one resource setting to obtain and report CSI for multi-TRP transmission. To this end, a method for configuring (one or more) resources / resource sets for CM for different TRPs, and a method for configuring / indicating IM relationships between (one or more) resources / resource sets corresponding to different TRPs are proposed. For example, different TRPs can be classified based on a CORESET group identifier (ID) (or index) (or CORESET pool index (CORESETpoolindex)).

[0271] Hereinafter, in the present disclosure, a resource set may refer to a non-zero power (NZP) CSI-RS resource set, or a resource set may refer to a CSI resource set including an NZP CSI-RS resource set and / or a CSI-IM (interference measurement) resource set. In addition, hereafter, in the present disclosure, a resource may refer to an NZP CSI-RS resource, and may also refer to a CSI resource including an NZP CSI-RS resource and / or a CSI-IM resource.

[0272] Proposal 1: Method for configuring (one or more) resources corresponding to different TRPs for a terminal in a single resource set

[0273] Proposal 1-1: The base station may configure (one or more) resources corresponding to different TRPs to the terminal in a single resource set. Here, the resource set may be a resource set configured in the resource setting for channel measurement in the report setting.

[0274] The base station can perform indication / configuration that such a resource set is a resource set for CSI calculation for multi-TRP transmission through L1 / L2 signaling to the terminal. In addition, the base station can indicate / configure to the terminal through L1 / L2 signaling how many CSI sets should be reported through the corresponding resource set (for example, N, N is a natural number), or it can be defined by a fixed rule. In addition, the base station can indicate / configure to the terminal through L1 / L2 signaling the number of TRPs corresponding to the resources of the corresponding resource set (for example, M>=N, M is a natural number), or it can be defined by a fixed rule. According to the corresponding indication / configuration / rule, the resources in the resource set can be classified into M resource groups (sets). When the indication / configuration is performed as described above, the terminal can select N groups of M resource groups for calculation / acquisition / reporting of N CSI sets. Moreover, the N resource groups and the N CSI sets can have a one-to-one correspondence, and for this reason, each CSI set can correspond to the resource group to which the resources used for CM belong.

[0275] The terminal can report information about the selected resource groups (i.e., CSI) to the base station. For N selected resource groups, when calculating / acquiring / reporting a specific CSI set (e.g., the jth CSI set) corresponding to a specific group (e.g., the i-th resource group), the resources in the specific group (e.g., the i-th resource group) can be used for CM. Furthermore, resources in (N-1) groups other than the specific group (e.g., the i-th resource group) applied to CM can be used for IM of the specific CSI set (e.g., the jth CSI set).

[0276] In the above proposal, "configuring (one or more) resources corresponding to different TRPs for the terminal in a resource set" can be interpreted as configuring resources corresponding to different TCI states for the terminal in the resource set. In addition, this may mean that resources in the same resource set have a CM / IM relationship with each other in the CSI calculation.

[0277] In the following, CSI calculation for multi-TRP transmission is described.

[0278] Figure 8 The diagram illustrates an interference signal of a terminal when multiple TRPs are transmitted in a wireless communication system to which the present disclosure can be applied.

[0279] In the above proposal, "CSI calculation for multi-TRP transmission" may refer to the following CM and IM methods.

[0280] based on Figure 8 , the receiving signal of the terminal can be expressed as follows.

[0281] [Formula 3]

[0282]

[0283] In formula 3, y Nrx×1 It can refer to the received signal of the terminal, H 1 Nrx×N1,tx It can refer to the channel of TRP 1, W 1 N1,tx×N1,ly It can refer to the precoding matrix (PM) of TRP 1, x 1 N1,ly×1 It can refer to the transmission signal of TRP 1, H 2 Nrx×N2,tx It can refer to the channel of TRP 2, W 2 N2,tx×N2,ly Can refer to PM of TRP 2, x 2 N2,ly×1 It can refer to the transmission signal of TRP 2, H 1,intf Nrx×N1,intfIt can refer to the interference channel of the multi-user (MU) signal of TRP 1, x 1 , intf N1,intf×1 It can be the interference signal of the MU signal of TRP 1. 2,intf Nrx×N2,intf It can refer to the interference channel of the MU signal of TRP 2, x 2 ,intf N2,intf×1 It can refer to the interference signal of the MU signal of TRP 2, I Nrx×1 It can refer to overlapping interference signals from inter-cell (iTRP), and n Nrx×1 It can refer to the noise of the terminal.

[0284] In formula 3, N rx It can refer to the number of receiving (antenna) ports of the terminal, N 1,tx It can refer to the number of transmission (antenna) ports of TRP 1, N 1,ly It can refer to the number of transport layers ( / rank) of TRP 1, N 2,tx It can refer to the number of transmission (antenna) ports of TRP 2, N 2,ly It can refer to the number of transport layers ( / rank) of TRP 2, N 1,intf It can refer to the number of interference layers ( / rank) of the MU signal of TRP 1, N 2,intf It can refer to the number of interference layers ( / rank) of the MU signal of TRP 2.

[0285] According to the current standard, the terminal can estimate the channel of TRP 1 by using the CSI-RS transmitted by TRP 1, and measure / calculate the CSI for TRP 1 (e.g., CRI / RI / PMI / CQI / LI (layer indicator), etc.) to perform feedback to the base station. Here, since the base station configures the NZP CSI-RS for CSI-IM and IM to the terminal for more accurate CSI calculation / acquisition / reporting, the terminal can measure the effective interference channel caused by the MU signal of TRP 1, the effective interference channel caused by the MU signal of TRP 2, the overlapping interference signal from the inter-cell ( / TRP), etc. Based on the channel of TRP 1, the interference channel caused by PM and the MU signal of TRP 1, the interference channel caused by the MU signal of TRP 2, the overlapping interference signal from the inter-cell ( / TRP), and the size of the noise, the terminal can measure the SINR. Based on the measured SINR, CSI (e.g., CRI / RI / PMI / CQI / LI, etc.) can be calculated / acquired, and the corresponding CSI can be fed back to the base station.

[0286] At the same time, in such a process, when the terminal performs multi-TRP transmission (for example, for NCJT) when calculating the CSI of TRP 1, the terminal may not measure the size of the interference signal and the size of the signal generated when the PMI of TRP 2 and the corresponding PMI are applied. Therefore, when the CSI calculated / acquired / reported by the terminal is equivalently applied to the multi-TRP transmission in the above example, the difference between the SINR of the terminal expected by the base station and the actual SINR may be generated by the influence of the interference signal generated between different TRPs that is not reflected in the CSI calculation. In addition, it may reduce system performance, such as an increase in the bit error rate of the received signal / a decrease in the transmission amount, etc. As a method that can make up for this shortcoming, the "CSI calculation for multi-TRP transmission" in the present disclosure may refer to the following operations.

[0287] Since the base station configures the NZP CSI-RS for CSI-IM and IM to the terminal, the terminal can measure the effective interference channel caused by the MU signal of TRP 1, the effective interference channel caused by the MU signal of TRP 2, and the overlapping interference signal from the inter-cell ( / TRP). In addition, since the base station configures the CSI-RS transmitted by TRP 1 and the CSI-RS transmitted by TRP 2 and configures / indicates the relationship between the two CSI-RS, the terminal can estimate the channel of TRP 1 and the channel of TRP 2 and estimate the interference channel between different TRPs. The terminal can estimate the interference channel between different TRPs based on the estimated value (for example, about H 1 Nrx×N1,tx ,H 2 Nrx×N2,tx ,H 1,intf Nrx×N1,intf ,H 2 ,intf Nrx×N2,intf ,I Nrx×1 Estimated values ​​of W 1 N1,tx×N1,ly and W 2 N2,tx×N2,lycombination that can maximize the received SINR. And, the terminal can calculate the CSI (e.g., CRI / RI / PMI / CQI / LI) of TRP 1 and TRP 2 respectively. Alternatively, the terminal can at least measure the size of the interference channel between different TRPs and reflect it in the CSI (e.g., CQI, etc.) calculation. In addition, in the above process, the terminal can perform a joint search for various beam combinations of different TRPs (e.g., through a combination of CRI-RSRP, ssb-index-RSRP, cri-SINR, ssb-index-SINR, etc.). Here, the terminal can calculate the CQI based on the SINR, on which the interference between different TRPs expected in multi-TRP transmission is reflected, and thus can have the advantage of being able to feed back more accurate CQI. In addition, when calculating the CSI, the covariance matrix value generated by using the estimated channel value can be used for SINR measurement. The detailed method is described in "The following method for SINR calculation considering multi-TRP transmission".

[0288] An example of a method for a base station to indicate / configure a resource set to be used for CSI calculation for multi-TRP transmission to a terminal is as follows. The following method may correspond to an example of L1 / L2 signaling for performing the proposed operation. However, it is clear that the proposal according to the present disclosure is not limited to the following method.

[0289] -A1: For each resource set, the operation (i.e., CSI calculation for multi-TRP transmission) can be configured by a specific parameter. Alternatively, for a resource set connected to a specific reporting setting, the operation (i.e., CSI calculation for multi-TRP transmission) can be configured by a specific parameter. The value of M corresponding to the number of resource groups (RG) in the resource set may correspond to an example of a parameter. Here, when the value of M is configured to be 2 or greater, the terminal may perform the CSI calculation for multi-TRP transmission proposed above. Alternatively, after assuming a fixed value of M (i.e., M may be predefined), a parameter in the form of a flag indicating whether to perform the operation (i.e., CSI calculation for multi-TRP transmission) may be defined.

[0290] -A2: The operation can be configured by a specific parameter in the report setting. The parameter (e.g., reportQuantity) for configuring the CSI entry can correspond to an example of the parameter. Here, when the CSI entry for multi-TRP transmission is included in the parameter (e.g., index / hypothesis indicator for RG combination, etc.), the operation proposed above (i.e., CSI calculation for multi-TRP transmission) can be performed. When it is configured to perform the above operation, the value of M can be indicated / configured to the terminal based on L1 / L2 signaling, or the value of M can be defined by a fixed rule. For example, the value of M can be configured together in the corresponding report setting, or the value of M can be configured in the resource setting / resource set connected to the corresponding report setting.

[0291] Hereinafter, the definition of a CSI set is described.

[0292] A CSI set may be defined as a value (or set / information) of one or more CSI entries including CRI / RI / PMI / L1 / CQI / L1-SINR / L1-RSRP.

[0293] Figure 9 The diagram illustrates a CSI set and a resource group in a resource set according to an embodiment of the present disclosure.

[0294] Figure 9 An example of the relationship between N (eg, 2) CSI sets and M (eg, 3) resource groups configured in a resource set is shown.

[0295] Figure 9 This example shows an example where N and M are configured as 2 and 3, respectively. Furthermore, this example shows an example where resources for CMs in CSI #1 (the first CSI set) are included in resource group (RG) #1, and resources for CMs in CSI #2 (the second CSI set) are included in resource group (RG) #2. A terminal can calculate CSI for two CSI sets using two resources included in different RG combinations.

[0296] For example, the terminal may assume multi-TRP transmission based on TRP#1 / #2. In addition, the terminal may assume that one of the resources in RG#1 is used as a resource for the CM used for CSI calculation of the first CSI set. In addition, the terminal may assume that one of the resources in RG#2 is used as a resource for the CM used for CSI calculation of the second CSI set. Here, the resources used for the CM in each CSI set can be used as resources for the IM in other CSI sets. For example, the resources used for the CM of the resources in RG#1 used for CSI calculation of the first CSI set can be used as resources for the IM in the second CSI set, and vice versa.

[0297] For this operation, it is possible to perform the operation for M (eg, 3), N (eg, 2) TRP combinations (in Figure 9 3 TRP combinations in the example) and K1 (e.g., 3) × K2 (e.g., 3) resource combinations (in Figure 9 CSI calculations are performed for a total of 27 resource combinations (9 resource combinations in the example) to find a TRP combination and resource combination that is more suitable for multi-TRP transmission. Here, K1 and K2 can respectively represent the total number of resources of the RG including resources for the CM in the first CSI set and the total number of resources of the RG including resources for the CM in the second CSI set.

[0298] At the same time, when the terminal should consider all TRP combinations and all resource combinations as in the example, the disadvantage that the complexity of the terminal for CSI calculation becomes too high may occur. In order to make up for such a disadvantage, the base station can perform instructions / configurations on the terminal through L1 / L2 signaling, and / or can fixedly apply specific rules between the base station and the terminal so that the terminal can only consider (one or more) specific TRPs and / or (one or more) specific TRP combinations and / or (one or more) specific resource combinations in the CSI calculation. For example, a resource set may include M (M is a natural number) CSI-RS resource groups (here, each CSI-RS resource group may correspond to a separate TRP), and N CSI-RS resource groups may be determined from the M CSI-RS resource groups. N CSI sets may be generated based on a combination of CSI-RS resources in the N CSI-RS resource groups. Here, the N CSI-RS resource groups may correspond to the N CSI sets described in the present disclosure (e.g., a one-to-one correspondence), and although not specifically mentioned in the present disclosure, the description regarding each CSI set may be interpreted as a description regarding each CSI-RS resource group (or each CSI-RS resource pair). In addition, in this case, in order to generate the nth (1≤n≤N) CSI set among the N CSI sets, a specific CSI-RS resource in the nth (1≤n≤N) CSI-RS resource group may be used for channel measurement, and the CSI-RS resources in the remaining CSI-RS resource groups except the nth CSI-RS resource group may be used for interference measurement.

[0299] Down Figure 10 This represents an example of applying a specific rule between the base station and the terminal so that only a combination of specific resources will be considered in CSI calculation.

[0300] Figure 10 The diagram illustrates a CSI set and a resource group in a resource set according to an embodiment of the present disclosure.

[0301] Figure 10The diagram shows that resources in different RGs can be sorted one-to-one in ascending (or descending) order. Figure 10 In the example, the terminal may assume multi-TRP transmission based on TRP#1 / #2. In addition, the terminal may assume one of the resources in RG#1 as the resource of the CM used for CSI calculation of the first CSI set. In addition, the terminal may assume that the resources in RG#2 that are in the same order (or index) as the resources in RG#1 are the resources of the CM used for CSI calculation of the second CSI set. For example, if the terminal uses resource#2 of the resources in RG#1 as the resource of the CM used for CSI calculation of the first CSI set, it may use resource#5 of the resources in RG#2 as the resource of the CM used for CSI calculation of the second CSI set.

[0302] Here, the resources used for the CM in each CSI set can be used as resources for the IM in other CSI sets. For example, the resources of the CM in RG#1 used for CSI calculation of the first CSI set can be used as resources for the IM in the second CSI set, and vice versa.

[0303] For operations such as this example, CSI calculation can be performed only on a total of 9 resource combinations, including 3 TRP combinations and 3 resource combinations, thereby significantly reducing the amount of calculation of the terminal.

[0304] Hereinafter, another definition of a CSI set is described.

[0305] Figure 9 and Figure 10 The example illustrates a case where the same CSI items (e.g., CRI / RI / PMI / LI / CQI, etc.) are included in each CSI set. Alternatively, the CSI items included in each CSI set may be defined differently. And / or, common CSI items may be defined separately for different CSI sets.

[0306] Figure 11 and Figure 12 The diagram illustrates a CSI set and a resource group in a resource set according to an embodiment of the present disclosure.

[0307] Figure 11 represents an example of differently defining CSI entries included in each CSI set, and Figure 12 An example of defining common CSI entries for different CSI sets is shown. Figure 11 In the example of , CRI / RI / CQI included in CSI#1 can be interpreted as a value commonly applied to CSI#1 / CSI#2. Alternatively, it can be defined separately in Figure 12In the example of , a CSI set (e.g., CSI#0) is commonly applied. For CSI entries that can be included in a CSI set, the following can be applied together. The following method illustrates L1 / L2 signaling for performing the proposed method of differently defining CSI entries included in each CSI set and / or defining common CSI entries, but is not limited to the following method.

[0308] -CRI: Different CRIs may be reported for different CSI sets. In this case, different CRIs may refer to CRIs included in different resource groups (RGs).

[0309] Alternatively, only one CRI may be reported for different CSI sets. Furthermore, a combination of resources included in different RGs may be reported based on the corresponding CRI values. In this case, the corresponding CRI value may refer to the order (or index) of the resources in each RG. Furthermore, the number of bits used for CRI reporting may be defined based on the number of resources included in a specific resource group (RG). According to current standards, the number of bits is determined based on the number of resources configured in a resource set, but according to this proposal, there is an advantage in that the number of bits used for CRI reporting can be saved.

[0310] As an example of this method, when the value indicated by the CRI is j, each j-th resource in the RG selected for the CSI set configuration may be selected. Alternatively, the corresponding CRI value may indicate the order (or index) indicating a specific resource, and another resource may be determined based on the index information of the specific resource and the information of the RG combination selected for the CSI set configuration. For example, when the order in the resource set of the specific resource index is n and the order in the RG is i, the i-th resource in another RG may be selected based on the order in the RG. A detailed description of the information of the RG combination selected for the CSI set configuration will be described later.

[0311] -RI: Different RIs can be reported for different CSI sets. Alternatively, only one RI can be reported for different CSI sets, and in this case, both CSI sets can assume the same RI reported above. Therefore, when only one RI is reported, the freedom for RI selection becomes lower, but the feedback overhead for RI reporting can be reduced.

[0312] Alternatively, for different CSI sets, the RI in other CSI sets can be defined as a differential value compared to the RI of a specific CSI set based on the RI of the specific CSI set. For example, when the RI value for a first CSI set is 2 and the RI value for a second CSI set is 4, the terminal can report 2 as the RI value for the first CSI set and 2 as the RI value for the second CSI set (i.e., the differential value compared to the RI of the first CSI set). In this case, the feedback overhead for RI reporting can be reduced.

[0313] In the above method, only specific RI combinations can be limited and defined in the CSI report. For example, the terminal can only report RI combinations such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, and 4:4 for each CSI set.

[0314] Alternatively, different RIs can be reported using values ​​representing (indicating) combinations of different RI values. For example, 10 states are assumed for RI combinations such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, and 4:4. In this case, the terminal can report a different RI value for each CSI set by reporting the state value corresponding to a specific RI combination.

[0315] - Transmission of 2 codewords (CWs): When the sum of RI values ​​for different CSI sets is equal to or greater than a specific value (e.g., 5), the terminal can report 2 CQIs for 2 CWs. Here, CQI reporting for different CWs is described in detail in the following CQI section.

[0316] -PMI: For different CSI sets, different independent PMI values ​​can be reported based on the PM (precoding matrix) defined in the standard.

[0317] Alternatively, for different CSI sets, the PMI in other CSI sets can be defined as a differential value compared to the PMI of a specific CSI set based on the PMI of the specific CSI set. For example, the (one or more) PMI index values ​​for the first CSI set can be reported as is, and the (one or more) PMI index values ​​for the second CSI set can be reported as a differential value compared to the (one or more) PMI index values ​​for the first CSI set. In this case, the feedback overhead for PMI reporting can be reduced. This method may assume that independent PM is applied to different TRPs. This example may assume that an independent PM is applied to each resource corresponding to a different CSI set.

[0318] -CQI: For different CSI sets, different independent CQI values ​​may be reported. Here, the SINR assumption for each CQI may be different. For example, for CSI#1, it may be defined as SINR1=S1 / (I 1,Ly1 +I 1,NCJT2 +I 1,MU1 +I 1,MU2 +I intf +N), and for CSI#2, it can be defined as SINR2=S2 / (I 2,Ly2 +I 2,NCJT1 +I 2,MU1 +I 2,MU2 +I intf +N). Here, S1 and S2 may represent the signal power of the TRP 1 channel and the signal power of the TRP 2 channel, respectively. 1,Ly1 and I 2,Ly2 I can represent the inter-layer interference signal power of the TRP 1 channel and the inter-layer interference signal power of the TRP 2 channel respectively. 1,NCJT2 and I 2,NCJT1 I can represent the interference signal power of TRP 2 channel to TRP 1 and the interference signal power of TRP 1 channel to TRP 2 respectively. 1,MU1 and I 2,MU2 I can represent the interference signal power of the MU channel of TRP 1 to TRP 1 and the interference signal power of the MU channel of TRP 2 to TRP 1 respectively. 1,MU1 and I 2,MU1 I can represent the interference signal power of the MU channel of TRP 1 to TRP 2 and the interference signal power of the MU channel of TRP 2 to TRP 2 respectively. intf It can represent the overlapping interference signal power ( / TRP) from between cells. N can represent the size of the noise.

[0319] Meanwhile, when the base station transmits signals from different TPRs simultaneously (e.g., for NCJT), the receiving SINR of the terminal can be defined as SINR NCJT =(S1+S2) / (I 1,Ly1 +I 1,NCJT2 +I 2,Ly2 +I 2,NCJT1 +I 1,MU1 +I 1,MU2 +I 2,MU1 +I 2,MU2 +I intf+N). As in the example described in the formula, when different independent CQI values ​​only consider the signal power of a specific TRP, it can have a different value from the CQI in actual multi-TRP transmission (for example, for NCJT). Therefore, the base station can instruct / configure the terminal to report a (single) CQI considering multi-TRP transmission (for example, for NCJT) through L1 / L2 signaling, or it can be defined by a fixed rule. In this case, only one CQI can be reported for different CSI sets. When only one CQI is reported as described above, it can represent the CQI for 1CW transmission.

[0320] -Describes the relationship between PDSCH transmission layer / (one or more) antenna ports for PDSCH (DMRS) / (one or more) antenna ports for CSI-RS / precoder in CQI calculation:

[0321] In the current standard, the UE assumes that the PDSCH signal in the antenna port set [1000, ..., 1000+v-1] for v layers is equivalent to the signal corresponding to the corresponding symbol transmitted from the antenna port [3000, ..., 3000+P-1], as shown in the following equation 4.

[0322] [Formula 4]

[0323]

[0324] x(i)=[x (0) (i)...x (v-1) (i)] Tis the vector of PDSCH symbols generated from the layer mapping. P∈{1,2,4,8,12,16,24,32} is the number of CSI-RS ports. When only one CSI-RS port is configured, w(i) is 1. When the higher layer parameter reportQuantity in the CSI-ReportConfig for reporting CQI is set to "cri-RI-PMI-CQI" or "cri-RI-LI-PMI-CQI", W(i) is the precoding matrix corresponding to the reported PMI applicable to x(i). When the higher layer parameter reportQuantity in the CSI-ReportConfig for reporting CQI is set to "cri-RI-CQI", W(i) is the precoding matrix corresponding to the procedure described in clause 5.2.1.4.2 of TS38.214. When the higher layer parameter reportQuantity in the CSI-ReportConfig reporting CQI is set to "cri-RI-i1-CQI", W(i) is the precoding matrix corresponding to i1 reported according to the procedure described in clause 5.2.1.4.2 of TS 38.214. The corresponding PDSCH signal transmitted in antenna ports [3000, ..., 3000+P-1] may have a ratio of PDSCH EPRE (energy per resource element) to CSI-RS EPRE that is the same as the ratio given in clause 5.2.2.3.1 of TS 38.214.

[0325] In the current standard, one resource is assumed in the CSI calculation and, therefore, has one RI / PMI. Therefore, in the CQI calculation defined in the standard, only one RI and PM are also considered in the relationship of the transport layer of PDSCH / (one or more) antenna ports for PDSCH (DMRS) / (one or more) antenna ports for CSI-RS / precoder. However, in the CSI calculation considering multi-TRP transmission, it can have each RI / PMI value corresponding to a different CSI-RS resource for a different CSI set. Therefore, in this case, the relationship between the CSI-RS port / RI / precoder corresponding to different resources corresponding to different CSI sets and the transport layer for PDSCH / antenna port for PDSCH (DMRS) should be defined.

[0326] -Method of reporting 1 CQI for transmission of 1 CW

[0327] For example, when the sum of RIs corresponding to different CSI sets is equal to or less than 4, 1 CQI for transmission of 1 CW may be reported. In this case, the CQI may be determined based on the following method.

[0328] 1) For CSI-RS ports and precoders, the order (or index, or order, or mapping) for CQI calculation can be defined based on the order (or index, or order (eg, ascending or descending)) of the CSI sets. The following equation 5 represents an example of this method.

[0329] [Formula 5]

[0330]

[0331] In formula 5, y (p) CSI1 (i) and y (p) CSI2 (i) may represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the first CSI set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the second CSI set, respectively. CSI1 and P CSI2 The numbers W and W may represent the number of CSI-RS ports of resources corresponding to the first CSI set and the number of CSI-RS ports of resources corresponding to the second CSI set, respectively. CSI1 (i) and W CSI2 (i) may represent PM corresponding to the first CSI set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the second CSI set (eg, PM selected by the terminal / selected by a rule), respectively. 0 may represent a matrix configured with all elements set to 0.

[0332] For the CSI-RS ports defined in Equation 5, it can be assumed that the signal corresponding to the symbol sent from the corresponding antenna port in the order in the vector is the same as the signal sent from the [1000,…,1000+v-1] port where the PDSCH is transmitted. Here, the symbols mapped to each layer can follow the definition of the standard. It can refer to the mapping relationship between each layer and the DMRS port. In addition, these contents can also be applied to the following proposals. For example, in the CQI calculation, the UE assumes that the PDSCH signal in the antenna port set [1000,…,1000+v-1] for v layers is equivalent to the signal at the antenna port [3000 CSI1 ,...,3000 CSI1 +P CSI1 -1,3000 CSI2 ,...,3000 CSI2 +P CSI2 -1] is the signal corresponding to the corresponding symbol sent in [x]. (0) (i)...x (v-1) (i)] T is a vector of PDSCH symbols generated by layer mapping.

[0333] 2) For CSI-RS ports and precoders, the order (or index, or order, or mapping) for CQI calculation can be defined based on the RI size of the CSI set (eg, ascending or descending). The following equation 6 represents an example of this method.

[0334] [Formula 6]

[0335]

[0336] In formula 6, y (p) CSIa (i) and y (p) CSIb (i) may represent the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set. CSIa and P CSIb The number of CSI-RS ports of resources corresponding to the CSIa set and the number of CSI-RS ports of resources corresponding to the CSIb set can be represented respectively. CSIa (i) and W CSIb (i) may represent PM corresponding to the CSIa set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the CSIb set (eg, PM selected by the terminal / selected by a rule). 0 may represent a matrix configured with all elements set to 0.

[0337] In this formula, for CSIa and CSIb, the order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb For example, when assuming the first condition, for RI CSI1 , RI CSI2 =2, 1, CSIa and CSIb may correspond to CSI1 and CSI2 respectively. Meanwhile, when the RIs of different CSI sets are the same, the order may be defined based on the method in 1).

[0338] -Method of reporting 2 CQIs for transmission of 2 CWs

[0339] For example, when the sum of RIs corresponding to different CSI sets is equal to or greater than 5, 2 CQIs for transmission of 2 CWs may be reported. In this case, each CQI corresponding to a different CW may be determined based on the following method.

[0340] 1) For CSI-RS ports and precoders, the order (or index, or order, or mapping) of CQI calculation can be defined based on the order (or index, or order (e.g., ascending or descending)) of CSI sets. Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can (sequentially) correspond to transmission layers of different LGs. For example, the PMs in CSI set 1 can (sequentially (e.g., in ascending / descending order)) correspond to transmission layers belonging to LG1, and the PMs in CSI set 2 can (sequentially (e.g., in ascending / descending order)) correspond to transmission layers belonging to LG 2. The following Equation 7 represents an example of this method.

[0341] [Formula 7]

[0342]

[0343] In formula 7, y (p) CSI1 (i) and y (p) CSI2 (i) may represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the first CSI set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the second CSI set, respectively. CSI1 and P CSI2 The numbers W and W may represent the number of CSI-RS ports of resources corresponding to the first CSI set and the number of CSI-RS ports of resources corresponding to the second CSI set, respectively. CSI1 (i) and W CSI2 (i) may represent PM corresponding to the first CSI set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the second CSI set (eg, PM selected by the terminal / selected by a rule), respectively. 0 may represent a matrix configured with all elements set to 0.

[0344] In Equation 7, v 1 LG1 and v 1 LG2 They can represent the first-level index of the first LG and the first-level index of the second LG, respectively.

[0345] In this method, transmission layers corresponding to different LGs may be defined based on all RI values, and an example may be as follows. For example, for RI=5 / 6 / 7, v may be defined. LG1 ={2,3,6,7}, v LG2 ={0,1,4,5} or v LG2 ={2,3,6,7}, v LG1 ={0,1,4,5}. In another example, for RI=6, we can define vLG1 ={2,3,5}, v LG2 ={0,1,4} or v LG2 ={2,3,5},v LG1 ={0,1,4}.

[0346] Based on the example of LG, when the RI values ​​of different CSI sets are different, LG2 may correspond to the CSI set with the larger RI value. In other words, for all RI values, the LG including the layer corresponding to the CW with the larger RI value may correspond to the CSI set with the larger RI value.

[0347] Alternatively, when different CSI sets have the same RI value, the CSI sets and LGs may correspond to each other based on a specific order (eg, ascending / descending order).

[0348] The reason why LG can be classified as described above is as follows: As described in the following standard, based on TS38.212, when a DMRS port index is indicated to a terminal through DCI, it can be defined as corresponding to a transport layer in the indicated DMRS port order.

[0349] For example, (one or more) antenna ports - 4, 5 or 6 bits, where the number of CDM groups without the value 1, 2, 3 refers to each CDM group {0, {0, 1}, {0, 1, 2}. The antenna ports {p0, ..., p v-1}.

[0350] Meanwhile, when multiple TCI states are indicated to the terminal for multi-TRP transmission, each TCI state and DMRS port may be defined as follows in TS38.214 so that they can be mapped to each other based on a CDM group including a DMRS port.

[0351] For example) when the UE is not indicated by a DCI including the DCI field "time domain resource assignment", the DCI field "time domain resource assignment" indicates an entry in the pdsch-TimeDomainAllocationList including RepNumR16 in PDSCH-TimeDomainResourceAllocation, and when 2 TCI states in the code point of the DCI field "transmission configuration indication" are indicated and (one or more) DM-RS ports in 2 CDM groups in the DCI field "(one or more) antenna ports" are indicated, the first TCI state corresponds to the CDM group of the first antenna port indicated by the antenna port indication table, and the second TCI state corresponds to the other CDM groups.

[0352] According to the above, when multiple TCI states are indicated to the terminal for multi-TRP transmission, each TCI state can be mapped to a DMRS port included in a specific CDM group. Furthermore, the DMRS ports are sequentially mapped to the transport layer in the order defined in the standard. Thus, when two CWs are transmitted, the DMRS ports corresponding to different TCI states can correspond to the layer corresponding to the specific CW. In other words, specific CWs can be mapped to different TRPs together without being mapped to a specific TRP.

[0353] Table 8 below shows the mapping relationship between each CW / layer / DMRS port / CDM group when sending 5 layers according to the current standard. (DMRS type 1 is shown)

[0354] [Table 8]

[0355]

[0356] As shown in Table 8, for CW1, it can be shown that DMRS ports corresponding to different CDM groups (i.e., corresponding to different TRPs) are mapped. When the terminal calculates the CQI of different CWs, the mapping relationship should be reflected. For example, according to the mapping relationship of layer-DMRS port-CDM group in the table, layers 0, 1, and 4 can correspond to TRP 1, and layers 2 and 3 can correspond to TRP2. Therefore, in the CQI calculation of CW1, the third layer of TRP 1 and the first and second layers of TRP 2 can be layers of transmitted signals and can be calculated as signal power in the CQI calculation. On the other hand, the first and second layers of TRP 1 corresponding to CW0 can be interference layers for CW1 and can be calculated as interference power in the CQI calculation for CW1.

[0357] As described in the example of Table 8, the layer corresponding to each CW may classify the layer group (LG) based on a mapping relationship of layer-DMRS port-CDM group (ie, based on the CDM group to which the layer will correspond).

[0358] Figure 13 Illustrated is information about a CDM group and a DMRS port corresponding to each layer based on all RIs according to an embodiment of the present disclosure.

[0359] 2) For CSI-RS ports and precoders, the order (or index, or order, or mapping) for CQI calculation can be defined based on the RI size of the CSI set (e.g., ascending or descending order). Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can (sequentially) correspond to transmission layers of different LGs. For example, the PMs in CSI set 1 can correspond (sequentially (e.g., in ascending / descending order)) to the transmission layers belonging to LG 1, and the PMs in CSI set 2 can correspond (sequentially (e.g., in ascending / descending order)) to the transmission layers belonging to LG 2. The following formula 8 represents an example of this method.

[0360] [Formula 8]

[0361]

[0362] In formula 8, y (p) CSIa (i) and y (p) CSIb (i) may represent the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set. CSIa and P CSIb The number of CSI-RS ports of resources corresponding to the CSIa set and the number of CSI-RS ports of resources corresponding to the CSIb set can be represented respectively. CSIa (i) and W CSIb (i) may represent PM corresponding to the CSIa set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the CSIb set (eg, PM selected by the terminal / selected by a rule). 0 may represent a matrix configured with all elements set to 0.

[0363] In this formula, for CSIa and CSIb, the order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb For example, when assuming the first condition, for RI CSI1 ,RI CSI2 =3, 2, CSIa and CSIb may correspond to CSI1 and CSI2 respectively. Meanwhile, when the RIs of different CSI sets are the same, the order may be defined based on the method in 1).

[0364] In formula 8, v 1 LG1 and v 1 LG2They can represent the first-level index of the first LG and the first-level index of the second LG, respectively.

[0365] In this method, transmission layers corresponding to different LGs may be defined based on all RI values, and an example may be as follows. For example, for RI=5 / 7 / 8, v may be defined. LG1 ={2,3,6,7}, v LG2 ={0,1,4,5} or v LG2 ={2,3,6,7}, v LG1 ={0,1,4,5}. In another example, for RI=6, we can define v LG1 ={2,3,5}, v LG2 ={0,1,4} or v LG2 ={2,3,5}, v LG1 ={0,1,4}.

[0366] Based on the example of LG, when the RI values ​​of different CSI sets are different, LG2 may correspond to the CSI set with the larger RI value. In other words, for all RI values, the LG including the layer corresponding to the CW with the larger RI value may correspond to the CSI set with the larger RI value.

[0367] Alternatively, when different CSI sets have the same RI value, the CSI sets and LGs may correspond to each other based on a specific order (eg, ascending / descending order).

[0368] -LI (Layer Indicator): Different independent LI values ​​can be reported for different CSI sets. Whether to report different independent L1 values ​​and / or the number of LI values ​​reported in each CSI set can be indicated by L1 / L2 signaling and / or can be determined based on a fixed rule. For example, the number of LI values ​​to be reported can be determined based on the maximum number of PTRS ports configured in the terminal. For example, when the maximum number of PTRS ports is configured as 2, two different LI values ​​can be reported in each CSI set. For example, when N is 2 (i.e., there are two CSI sets), the LI value for each CSI set and / or the number of bits required to report the LI value can be determined based on the RI and / or PMI reported in each CSI set. For example, when the RI value corresponding to a particular CSI set is assumed to be v, the number of bits required to report the LI value for the particular CSI set can be determined based on the number of ports configured with resources corresponding to the corresponding CSI set. For example, a value such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)) can be determined. In addition, the reported LI value may represent the strongest layer index corresponding to a specific column of the PM corresponding to the PMI of the corresponding CSI set. Meanwhile, when the maximum number of PTRS ports is configured as 1, one LI value may be reported. Alternatively, an LI value selected for a specific CSI set may be reported, and LI values ​​fixed to specific values ​​for the remaining N-1 CSI sets may be reported.

[0369] -A1. When one LI value is reported for different CSI sets and independent CQIs are reported in different CSI sets: The number of bits required to report the corresponding LI may be determined based on the maximum value (e.g., v) of the RI values ​​included in all CSI sets and the number of ports configuring the resources corresponding to the CSI set including the maximum RI value. For example, a value such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)) may be determined. Here, the CSI set corresponding to the reported LI value may be determined based on the RI / CQI included in each CSI set. For example, the CSI set corresponding to the reported LI value may be determined as the CSI set with a larger CQI, and / or (when the CQI is the same) may be determined as the CSI set with a larger RI value, and / or (when the CQI / RI is the same) may be determined as a specific CSI set (e.g., the first CSI set). The reported LI value may represent the strongest layer index corresponding to a specific column of the PM corresponding to the PMI of the corresponding CSI set.

[0370] -A2. When one LI value is reported for different CSI sets and one CQI is reported for different CSI sets: The number of bits required for reporting the corresponding LI may be determined based on the maximum value (e.g., v) of the RI values ​​included in all CSI sets and the number of ports configuring the resources corresponding to the CSI set including the maximum RI value. For example, a value such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)) may be determined. Here, the CSI set corresponding to the reported LI value may be determined based on the RI included in each CSI set. For example, the reported LI value may be determined as the CSI set with the larger RI value and / or (when the RIs are the same) may be determined as a specific CSI set (e.g., the first CSI set). And / or, the CSI set corresponding to the reported LI value may be determined as the CSI set with the larger signal power / larger SINR. The reported LI value may represent the strongest layer index corresponding to a specific column of the PM of the PMI corresponding to the corresponding CSI set.

[0371] At the same time, when an LI value is reported in the proposal, a variable for reporting whether the LI value corresponds to which CSI set of multiple CSI sets is reported can be defined. For example, a specific CSI set in two CSI sets can be reported by 1 bit of information. Alternatively, a rule can be defined so that the reported LI value will correspond to a specific CSI set. For example, when an LI value is reported, it can be defined as corresponding to the first (or lowest / highest) CSI set. Here, the terminal can arrange the order of RI / PMI to be reported in each CSI set based on the LI value. For example, the RI / PMI corresponding to the LI value, etc. can correspond to the first CSI set, and the remaining CSI can correspond to the remaining CSI sets to report them to the base station.

[0372] For the reported RI / PMI, a mutual pair may be defined, and the reporting method / reporting information amount, etc. of the PMI may be determined based on the paired RI value.

[0373] Hereinafter, a method of defining resource groups in a resource set is described.

[0374] For the M resource groups (RGs) in a resource set, each RG may be configured with one or more resources.

[0375] Table 9 shows the NZP-CSI-RS-RESOURCESET information element that defines a resource set.

[0376] [Table 9]

[0377]

[0378] As described in Table 9, resources can be configured in nzp-CSI-RS-Resources. In other words, resources can be configured in NZP CSI-RS resources. The resources configured in nzp-CSI-RS-Resources can be classified into M RGs according to the fixed rules of the base station and / or L1 / L2 signaling. For example, according to the above-mentioned "method for a base station to indicate / configure a resource set to be used for CSI calculation for multiple TRP transmissions to a terminal", the terminal receiving the corresponding indication / configuration can classify the resources in the resource set into M RGs.

[0379] The method of classifying the resources configured in nzp-CSI-RS-Resources into M RGs is as shown in the following example (for example, A1 / A2).

[0380] -A1: The M*(n)+i-th resource in nzp-CSI-RS-Resources may be included in the i-th RG. (i=0,...,M-1,n=0,1,...)

[0381] -A2: The M*(i)+nth resource in nzp-CSI-RS-Resources may be included in the i-th RG. (n=0,...,M-1,i=0,1,...)

[0382] Based on the current standard, the maximum number of resources in nzp-CSI-RS-Resources can be configured by specific parameters. For example, the maximum number of resources (e.g., 64) can be configured according to the maxNrofNZP-CSI-RS-ResourcesPerSet parameter. The maximum number of resources that can be actually configured may vary depending on the reported information or the reporting quantity (e.g., parameter reportQuantity) configured in the reporting setting to which the resource set is connected. For example, when the reporting quantity (e.g., parameter reportQuantity) is configured as one of CRI / RI / CQI reporting (cri-RI-CQI), CRI / RI / i1 (some index in PMI) reporting (cri-RI-i1), CRI / RI / i1 (some index in PMI) / CQI reporting (cri-RI-i1-CQI), CRI / RI / PMI / CQI reporting (cri-RI-PMI-CQI), CQI / RI / LI / PMI / CQI reporting (cri-RI-LI-PMI-CQI), each resource set can be configured with up to 8 resources. This limitation considers a single TRP transmission, so when considering multiple TRP transmissions, the maximum number of resources configured per resource set can be defined / configured to a value greater than 8. For example, it can be defined as 8*M / 8*max(M). To this end, the maximum number of resources that can be configured in a resource set can be defined based on (one or more) specific parameters configured in the resource set (such as whether to perform an operation / the value of M / the value of N, etc.) and / or (one or more) specific parameters configured in the report setting to which the resource set is connected (such as the report quantity (the value of reportQuantity)).

[0383] Hereinafter, a method of reporting combined information of resource groups (RGs) selected for CSI set configuration is described.

[0384] In the above proposal, M resource groups are defined, each of which is configured with one or more resources in a resource set. According to the proposal, N RGs can be selected from the M RGs, and the terminal should report to the base station which RG combination is used to calculate / acquire / report CSI.

[0385] Meanwhile, in order to omit reporting on such selected RGs, the base station may be instructed / configured to calculate / acquire / report CSI for N CSI sets based on N RGs, or may be defined by a fixed rule. Also, the terminal may not report information on RGs to the base station.

[0386] However, although the same number of RGs as CSI sets are configured, there may be a case where the terminal can determine that the performance of a single TRP transmission considering a specific TRP is better than the performance of a multi-TRP transmission considering N TRPs. For example, when the total number of ranks is the same / similar, the case where the CQI considering a single TRP transmission is higher than the CQI considering multiple TRP transmissions can correspond to it. In this way, when the number M of RGs configured / included in the resource set is the same as and greater than the number N of CSI sets that should be reported, the terminal should report to the base station which RG group is used to report the CSI set. To this end, when reporting N CSI sets, the terminal can report standard information about N or fewer RG groups to the base station. For this reporting, the following method can be applied.

[0387] -A1: The terminal can report N or fewer specific RGs based on a bitmap configured with M bits.

[0388] -A2: A bit field may be defined that may indicate Combination(M,N)+Combination(M,N-1)+...+Combination(M,1) RG combinations, and the terminal may report N or fewer specific RGs based on the correspondence between the corresponding bit field and the specific RG combination.

[0389] When the number of RGs reported according to the proposal is less than N, the CSI configuring N-1 CSI sets (e.g., CRI / RI / PMI / LI / CQI, etc.) can be fixed to a specific value. Alternatively, the information / size of part 1 / 2 can be determined based on the number of RGs reported to the base station. The part 1 / 2 information is defined in TS38.214 and includes the following. Part 1 is used to identify the number of information bits in part 2 with a fixed payload size. Part 1 should be fully transmitted before part 2.

[0390] In addition to this proposal, to reduce the feedback overhead and complexity of CSI calculation in the terminal, it is also possible to define, based on L1 / L2 signaling and / or fixed rules, that CSI is calculated / acquired / reported only for specific RG combination candidates among all RG combination candidates that are combined with M RGs. Tables 10 to 12 below show such examples.

[0391] [Table 10]

[0392] candidate Report RG#1 open RG#2 open RG#3 open RG#1-#2 open RG#1-#3 open RG#2-#3 open

[0393] [Table 11]

[0394] candidate Report RG#1 close RG#2 close RG#3 close RG#1-#2 open RG#1-#3 open RG#2-#3 open

[0395] [Table 12]

[0396] candidate Report RG#1 open RG#2 close RG#3 open RG#1-#2 close RG#1-#3 open RG#2-#3 close

[0397] In the examples of Tables 10 to 12, M and N are assumed to be configured as 3 and 2, respectively. Table 10 represents an example of being configured to perform CSI calculation / acquisition / reporting for all possible RG combinations. On the other hand, Tables 11 and 12 represent examples of being configured not to consider specific RG combinations. Table 11 represents an example of being configured not to perform CSI calculation / acquisition / reporting for a single TRP transmission. Table 12 represents an example of being configured not to perform CSI calculation / acquisition / reporting including the TRP corresponding to RG#2. In other words, Table 12 is an example of being configured not to calculate / acquire / report CSI including the TRP corresponding to a specific RG. (In other words, it can be configured to calculate / acquire / report CSI including only the TRP corresponding to a specific RG.) The base station can configure the operation of the terminal through specific parameters in each report setting.

[0398] When configured to calculate / acquire / report CSI only for a specific candidate among all RG combination candidates based on a proposal, the configuration (and / or size) of the CSI payload can be determined based on the "specific candidate". For example, for the example of Table 10, 3 bits indicating a specific RG combination among a total of 6 candidates should be included in the CSI payload. However, in the examples of Table 11 or Table 12, CSI can be calculated / acquired / reported only for 3 candidates out of a total of 6 candidates, so only 2 bits indicating a specific RG combination among the 3 candidates can be included in the CSI payload. And / or, it can be defined to maintain the size of the CSI payload (i.e., fixed at a specific size) and fixedly report a specific value for a specific payload (e.g., for zero padding).

[0399] Alternatively, when it is configured to calculate / acquire / report CSI only for specific candidates among all RG combination candidates based on a proposal, the number of CPUs (CSI processing units) used for CSI reporting can be determined based on the "specific candidate." For example, for the example in Table 10, the number of CPUs used for CSI calculation / acquisition / reporting for a total of six candidates should be considered. However, in the examples in Table 11 or Table 12, CSI can be calculated / acquired / reported for only three of the six candidates, and thus the number of CPUs used to consider only three candidates can be defined.

[0400] At the same time, in addition to this proposal, it may be defined as necessary to calculate / acquire / report the CSI of a specific candidate among all RG combination candidates that may be implemented with M RGs based on L1 / L2 signaling and / or fixed rules. For example, the terminal may be defined to calculate / acquire / report the CSI related to a single TRP transmission. In the example of Table 10, the terminal may calculate / acquire CSI based on the resources in RG#1 / #2 / #3 to calculate / acquire / report the CSI for a single TRP transmission, and may report to the base station the CSI calculated / acquired based on the specific resources in the most preferred specific RG assuming a single TRP transmission (e.g., highest SINR / CQI / RI / throughput, etc.). The CSI for a single TRP transmission may always be reported regardless of the CSI for multiple TRP transmissions, and furthermore, the CSI for multiple TRP transmissions (e.g., for NCJT / URLLC, etc.) may be reported together. In other words, the example of Table 10 may represent a case where the CSI for a single TRP and the CSI for multiple TRPs are always reported together to the base station. As described above, when the terminal always reports the CSI for a single TRP regardless of the CSI for multiple TRPs, the base station can know the CSI of a single TRP suitable for a specific terminal when the base station may not be able to perform multiple TRP transmission for any reason (although multiple TRP transmission is better for a specific terminal). Therefore, there is an advantage that scheduling suitable for a specific terminal can be performed.

[0401] And / or, when it is necessary to calculate / acquire / report CSI for a specific candidate based on a proposal and whether or not to report CSI for a specific candidate is variable (selective), a state that can indicate whether reporting is performed can be defined together in the CSI payload for reporting a specific RG combination. For example, when it is defined / configured that it is necessary to calculate / acquire / report CSI related to a single TRP transmission, and it is defined / configured to report CSI related to multiple TRP transmissions based on the selection of the terminal, a state related to "not reporting" can be defined in the CSI payload for reporting RG combinations related to multiple TRP transmissions. In the example of Table 10, there are three RG combinations {#1,#2}, {#1,#3}, {#2,#3} related to multiple TRP transmissions, and since the state of "not reporting" is added thereto, the CSI payload can be configured with 2 bits for a total of 4 states.

[0402] And / or, states related to reporting / partial reporting (e.g., for CSI omission) / non-reporting may be defined by adding or replacing states for "non-reporting."

[0403] The relationship between the resource groups in a resource set and the CSI-IM / NZP CSI-RS configured in the resource setting for IM is described.

[0404] Figure 14 is a diagram illustrating a mapping relationship between resources used for channel measurement and resources used for interference measurement in a wireless communication system to which the present disclosure may be applied.

[0405] refer to Figure 14 (a) As defined in TS 38.214, the NZP CSI-RS resource for the resource setting of the CM connected to the reporting setting and the CSI-IM resource for the IM are mapped to each other on a resource-by-resource basis in CSI calculation. For example, a first NZP CSI-RS resource may be used together with a first CSI-IM resource in CSI calculation, and a second NZP CSI-RS resource may be used together with a second CSI-IM resource in CSI calculation.

[0406] refer to Figure 14 (b) When the NZP CSI-RS resource for IM is configured in the reporting settings, only one of the NZP CSI-RS resource for CM and the CSI-IM resource for IM can be configured. Furthermore, in CSI calculation, the NZP CSI-RS resource, the CSI-IM resource, and the NZP CSI-RS resource for IM can be applied together.

[0407] Meanwhile, when multiple resource groups are configured in a resource set according to the proposal, the mapping method defined in the current standard can be used for CSI calculation as is. However, in this case, unnecessary resources may be defined for defining CSI-IM resources for IM, increasing RS overhead, and NZP CSI-RS resources for IM may not be defined. To compensate for this, when multiple resource groups are configured in a resource set, the relationship between the resource groups in the resource set and the CSI-IM / NZP CSI-RS configured in the resource settings for IM can be defined as follows for CSI calculation.

[0408] Figures 15 to 17 is a diagram illustrating a mapping relationship between resources for channel measurement and resources for interference measurement according to an embodiment of the present disclosure.

[0409] - The CSI-IM resources configured in the resource setting for IM can be mapped to the resources in each resource group on a resource-by-resource basis.

[0410] refer to Figure 15For example, when calculating CSI, the first NZP CSI-RS resource in the first resource group (RG) can be applied together with the first CSI-IM resource, and when calculating CSI, the second NZP CSI-RS resource in the second RG can also be applied together with the second CSI-IM resource. Similarly, when calculating CSI, the second NZP CSI-RS resource in the first resource group (RG) can be applied together with the second CSI-IM resource, and when calculating CSI, the second NZP CSI-RS resource in the second RG can also be applied together with the second CSI-IM resource.

[0411] Alternatively, refer to Figure 16 , CSI-IM resources can be mapped to a specific resource group (RG) on a resource unit basis (e.g., Figure 16 Specific resources in RG#2 in . Resource groups other than specific resource groups (e.g., Figure 16 The resources mapped to the CSI-IM resources among the resources included in RG#1 in FIG. Figure 16 The resource #1 of RG #1 in RG#1) can be mapped to the resource assumed for IM between RGs (e.g., Figure 16 Resource #1 of the CSI-IM resource in ).

[0412] - When configuring NZP CSI-RS resources in the resource setting for IM, only one resource in the resource group may be configured, and when performing CSI calculation, the NZP CSI-RS resources, CSI-IM resources, and NZP CSI-RS resources for IM in each resource group may be applied together. For example, refer to Figure 17 , when performing CSI calculation, resource #1 in resource group #1, CSI-IM resource #1, and NZP CSI-RS resource #1 for IM may be applied together.

[0413] In the following, methods for configuring different QCL-typeD reference resources are described.

[0414] The above proposal assumes that resources included in different resource groups (RGs) are not configured with QCL-type D, or that the same QCL-type D is configured on a resource-by-resource basis. As described in "Relationship between Resource Groups in a Resource Set and CSI-IM / NZP CSI-RS Configured in Resource Settings for IM," this proposal applies equally to CSI-IM resources for IM and NZP CSI-RS resources mapped to resources in each RG.

[0415] At the same time, the situation in which different QCL-type D RSs are configured can be supported by considering a frequency band higher than FR 1. For example, when the terminal can be equipped with multiple panels and simultaneously receives signals by using multiple receiving beams, the terminal can receive (one or more) PDSCHs configured with multiple QCL-type D RSs. In this case, different QCL-type D RSs need to be configured for resources included in different RGs to obtain / report CSI considering multiple TRP transmissions. To this end, the terminal can report relative UE capabilities to the base station. UE capability can be an ability that indicates that the terminal can simultaneously receive signals through multiple spatial domain receiving filters based on different QCL-type D RSs. The base station can, based on the UE capability, configure different QCL-type D RSs for resources corresponding to different RGs for the corresponding terminal for CSI calculation considering multiple TRP transmissions. When different QCL-type D RSs are configured for resources corresponding to different RGs, the terminal can receive resources through multiple spatial domain receiving filters (i.e., through multiple panels) based on different QCL-type D RSs. The same applies to CSI-IM resources and NZP CSI-RS resources for IM, which are mapped to resources in each RG described in "Relationship between Resource Groups in a Resource Set and CSI-IM / NZP CSI-RS Configured in Resource Settings for IM." Furthermore, resources corresponding to different RGs are configured with different QCL-type D RSs but can be defined to be transmitted in the same OFDM symbol. Furthermore, resources corresponding to different RGs can have a one-to-one correspondence between the different RGs.

[0416] Figure 18 The diagram illustrates an operation of receiving a CSI-RS configured with multiple different QCL type D reference resources according to an embodiment of the present disclosure.

[0417] As shown in the following Equation 9, an operation of receiving CSI-RS through multiple spatial domain reception filters (ie, through multiple panels) based on different QCL-type D RSs may be expressed.

[0418] [Formula 9]

[0419]

[0420] In formula 9, y 2×1 can represent the vector of the received signal, and n 2×1 x1 may represent the transmission signal of the CSI-RS port of TRP 1, and x2 may represent the transmission signal of the CSI-RS port of TRP 2. i,p,jIt can represent the channel coefficient between the CSI-RS port of the i-th TRP and the j-th receiving port of the p-th panel of the terminal. As in the above example, the receiving beams of panel 1 and panel 2 may be different. It can be interpreted that different CSI-RS resources (for CM) considered in the CSI calculation considering multi-TRP transmission are configured with different QCL-TypeD RS. In other words, it is assumed that the QCL-TypeD RS of resource #a included in RG#1 corresponding to TRP 1 is configured as A, and the QCL-TypeD RS of resource #b included in RG#2 corresponding to TRP 2 is configured as B. And, it is assumed that the two resources correspond to different CSI sets respectively. In this case, the terminal can simultaneously receive CSI-RS in a specific resource through different receiving beams. And, the terminal can estimate h by using the received signal of each receiving port of the terminal through the CSI-RS transmitted by resource #a 1,1,1 +h 1,2,1 and h 1,1,2 +h 1,2,2 , and estimate h using the received signal of each receiving port of the terminal through the CSI-RS transmitted by resource #b 2,1,1 +h 2,2,1 and h 2,1,2 +h 2,2,2 .

[0421] Equation 9 assumes that the terminal does not classify the receive antenna ports of different panels. Meanwhile, the terminal can also receive signals by classifying the receive antenna ports of different panels. Equation 10 below illustrates an example of a terminal receiving signals by classifying the receive antenna ports of different panels.

[0422] [Equation 10]

[0423]

[0424] As in the above example, it is assumed that the QCL-TypeD RS of resource #a included in RG #1 corresponding to TRP 1 is configured as A, and the QCL-TypeD RS of resource #b included in RG #2 corresponding to TRP 2 is configured as B. Furthermore, it is assumed that the two resources correspond to different CSI sets. In this case, the terminal can simultaneously receive CSI-RS in a specific resource through different receive beams. Furthermore, the terminal can estimate h using the received signal of each receive port of the terminal using the CSI-RS transmitted by resource #a. 1,1,1 ,h 1,2,1 ,h 1,1,2 and h 1,2,2 , and estimate h using the received signal of each receiving port of the terminal through the CSI-RS transmitted by resource #b2,1,1 ,h 2,2,1 ,h 2,1,2 ,h 2,2,2 .

[0425] In order to apply this method, multiple different QCL-Type D RSs can be configured for CSI-RS resources (based on UE capabilities). When different QCL-Type D RSs are configured for CSI-RS resources, the terminal can receive the resources through multiple receive filters (i.e., spatial domain receive filters) based on different QCL-Type D RSs. Here, for the corresponding terminal, in order to consider the CSI calculation of multi-TRP transmission, the multiple QCL-Type D RSs configured for resources corresponding to different RGs can be defined as the same. For example, when the QCL-Type D RS of resource #a included in RG#1 corresponding to TRP 1 is configured as A and B, the QCL-Type D RS of resource #b included in RG#2 corresponding to TRP 2 can be configured as A and B. This method can be equally applied to the CSI-IM resources and NZP CSI-RS resources for IM mapped to the resources in each RG described in "Relationship between resource groups in a resource set and CSI-IM / NZP CSI-RS configured in the resource setting for IM".

[0426] In the following, a CSI processing unit considering CSI for multi-TRP transmission is described.

[0427] TS 38.214 defines a CSI processing unit (CPU), which represents the number of CSIs that can be simultaneously calculated by a terminal. The number of CPUs occupied is defined differently depending on the reporting quantity configured in the reporting settings (e.g., the parameter reportQuantity). Table 13 below shows a portion of the description of the CPUs defined in the standard.

[0428] [Table 13]

[0429]

[0430]

[0431] In addition to the definitions in Table 13, when CSI considering multi-TRP transmission is introduced, the complexity of the terminal may increase compared to existing operations, and therefore, a new CPU definition may be introduced to reflect it.

[0432] Table 14 illustrates a method for defining the number of CPUs required for CSI calculation for multi-TRP transmission based on the number of CPUs defined according to the higher layer parameter reportQuantity in the current standard. In other words, it may correspond to 0 in the standard description. CPU.

[0433] In Table 14 below, various options are presented by combining A1-1, A1-2, A2-1, A2-2, A3-1, A3-2, B1, and B2, but not all of them are necessarily used. Only options based on any one combination may be used, or options based on two or more combinations may be selectively used under specific conditions.

[0434] For ease of description, "CSI considering multiple TRP transmissions" may be referred to as mTRP CSI. And, "CSI considering multiple TRP transmissions" may be configured to the terminal through the reportQuantity of CSI-ReportConfig. "CSI considering multiple TRP transmissions" may be defined as values ​​including (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc. And / or "CSI considering multiple TRP transmissions" may represent / include the case where beam / RS pair information is configured. And / or "CSI considering multiple TRP transmissions" may represent / include the case where multiple resource groups are configured in a resource set. And / or "CSI considering multiple TRP transmissions" may represent / include the case where multiple CSI sets are configured to be reported. The CSI opposite to MTRP CSI may be referred to as STRP CSI (i.e., single TRP CSI), which may represent the previously defined CSI.

[0435] [Table 14]

[0436]

[0437] In Table 14, K S Represents the number of all resources included in a resource set. C(M,2) represents the number of combinations of selecting 2 RGs for all resource groups (e.g., M resource groups). Here, 2 is only an example and is not limited thereto and can be generalized to N. K s ' represents the number of resources included in one RG. In Table 14, for convenience, it is assumed that for all RGs, the number of resources in the RG is the same as K s ' is the same, but it is also possible to consider a case where the quantity is defined differently. In the following, each case is described by referring to Table 14.

[0438] A1-1: When all possible CRI combinations for different RGs are calculated, and here, operations are performed by independently changing the RI / PMI, etc. in the resources of each RG (and / or when each CRI combination in each RG combination is calculated and operations are performed by independently changing the RI / PMI, etc. in each resource)

[0439] A1-2: When calculating a specific CRI combination for different RGs (e.g., a combination having a one-to-one correspondence, first-first, second-second, ...), and performing an operation by independently changing the RI / PMI, etc. in the resources of each RG (and / or when calculating each CRI combination in each RG combination (CRI combinations are limited based on a specific rule) and performing an operation by independently changing the RI / PMI, etc. in each resource)

[0440] A2-1: When all possible CRI combinations for different RGs are calculated, but after selecting a specific CRI combination for the different RG combinations (assuming that the CSI of a single TRP can be used for the selection), the operation is performed by independently changing the RI / PMI, etc. in the selected resource of each RG for the different RG combinations (and / or when the operation is performed by independently changing the RI / PMI, etc. in each resource for the selected CRI combination in each RG combination (e.g., by a single TRP CSI))

[0441] A2-2: When specific CRI combinations for different RGs are calculated (e.g., combinations having a one-to-one correspondence, first-first, second-second, ...), but after selecting specific CRI combinations for different RG combinations (e.g., assuming that CSI of a single TRP can be used for selection), operations are performed by independently changing the RI / PMI, etc. in selected resources for each RG of the different RG combinations (and / or when operations are performed by independently changing the RI / PMI, etc. in each resource for the selected CRI combination in each RG combination (CRI combinations are limited based on specific rules) (e.g., by a single TRP CSI))

[0442] A3-1: When all possible CRI combinations for different RGs are calculated, but after selecting a specific CRI combination for all RGs (assuming that the CSI of a single TRP can be used for selection), the operation is performed by independently changing the RI / PMI, etc. in the resources of each RG (and / or when the operation is performed by independently changing the RI / PMI, etc. in each resource in each RG for a specific RG combination selected based on the selected CRI combination)

[0443] A3-2: When specific CRI combinations for different RGs are calculated (e.g., combinations with a one-to-one correspondence, first-first, second-second, ...), but after selecting a specific CRI combination for all RGs (e.g., assuming that the CSI of a single TRP can be used for selection), an operation is performed by independently changing the RI / PMI, etc. in the resources of each RG (and / or when an operation is performed by independently changing the RI / PMI in each resource of each RG for a specific RG combination selected based on the selected CRI combination (the CRI combination is limited based on a specific rule) (e.g., by a single TRP CSI))

[0444] B1: When considering the assumption about the transmission of a single TRP

[0445] B2: When the assumption about the transmission of a single TRP is not considered

[0446] In this proposal, for convenience of description, each case (e.g., A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2) is classified, but the number of specific CPUs may be applied without limiting the case.

[0447] The following proposals may be considered in addition to the proposals and / or in addition to existing CPU definitions and / or independently / together.

[0448] -When calculating the CSI of M-TRP at the same time, the CPU usage is assumed to be M-CPU. "M-CPU" can represent the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 methods.

[0449] When the sum of ranks is equal to or greater than a certain value (e.g., 4), the CPU occupancy is assumed to be 2. This may mean that it is defined as double the value compared to the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 methods and / or defined as double the value compared to the existing CPU definition. (This may also apply to the following proposals.)

[0450] When the size of the bandwidth (BW) or subband (SB) configured for CSI reporting is equal to or greater than a specific number, the CPU occupancy is assumed to be 2. This may mean that it is defined as a double value compared to the above-mentioned proposed A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 methods and / or defined as a double value compared to the existing CPU definition.

[0451] - In the BM report, the CPU occupancy is assumed to be the number of TRPs. "BM report" may indicate a case where the reportQuantity of CSI-ReportConfig is configured to include values ​​of cri-RSRP / ssb-Index-RSRP / cri-SINR / ssb-Index-SINR, etc. The "number of TRPs" may correspond to the number of resource groups in a resource set. Alternatively, each TRP may be classified according to information about a CORESET group (or CORESET pool) (e.g., index, identifier (ID)), and the "number of TRPs" may correspond to the number of CORESET groups (pools) / the number of CORESET group IDs / the number of CORESET pool indexes.

[0452] When the number of CRI candidate values ​​is greater than the number of resources used for CM in N CPU calculations, the terminal may recognize it as a CSI report for mTRP (ie, multiple TRP) CSI feedback.

[0453] In the following, priority rules for CSI reporting are described.

[0454] TS38.214 defines a priority rule for CSI reporting to determine which CSI to feed back when channels / resources for CSI feedback overlap / collide. Table 15 below illustrates a portion of the description regarding the priority rule defined in the standard.

[0455] [Table 15]

[0456]

[0457] In addition to this definition, when CSI that considers multi-TRP transmission is introduced, it can also include more information compared to the previously defined CSI, so new priority rules can be defined by reflecting this. The following shows a proposal for a newly defined priority rule and an example of applying the proposal based on the priority rule defined in the current standard.

[0458] "CSI considering multiple TRP transmissions" may be referred to as MTRP CSI and may be configured to the terminal via the reportQuantity of CSI-ReportConfig. In addition, "CSI considering multiple TRP transmissions" may be defined as including values ​​of (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc. And / or "CSI considering multiple TRP transmissions" may represent / include a case where beam / RS pair information is configured. And / or "CSI considering multiple TRP transmissions" may represent / include a case where multiple resource groups are configured in a resource set. And / or "CSI considering multiple TRP transmissions" may represent / include a case where multiple CSI sets are configured to be reported. The CSI opposite to MTRP CSI may be referred to as STRP CSI (i.e., single TRP CSI), which may represent the previously defined CSI.

[0459] A1.MTRP CSI can be defined as a higher priority than STRP CSI. A higher priority may mean that it can be sent first when the channels / resources used for CSI feedback overlap / conflict. In addition, the CSI used for BM (beam management) (e.g., for L1-RSRP / L1-SINR) can be defined as the highest priority, regardless of MTRP CSI / STRP CSI. In other words, for example, the priority can be defined in the order of CSI for BM (for MTRP / STRP CSI)>MTRP CSI (for non-BM)>STRP CSI (for non-BM). The reason why the CSI for BM is defined as the highest priority is that when the BM between the base station and the terminal fails, communication may be impossible due to deterioration of signal quality. Therefore, BM can be performed smoothly by defining the CSI for BM as the highest priority. At the same time, the reason why MTRP CSI should be defined as a higher priority than STRP CSI is as follows. The base station should send CSI-RS corresponding to different TRPs to the terminal to calculate the MTRP CSI. In addition, the terminal should calculate (joint) CSI by using the corresponding RS, so it may require more complexity / battery than STRP CSI. Therefore, since CSI is generated based on the terminal's large resources and complexity, it may be desirable to send it first. In addition, since the channel information corresponding to different TRPs can be considered to be included in the joint CSI itself, the effect of reporting STRP CSI corresponding to each TRP can be achieved by reporting MTRP CSI to the base station.

[0460] Table 16 below shows an example of how this proposal is applied to the current standard. iCSI(y, k, c, s) can be expressed as follows, and for k = 1 (e.g., MTRP CSI (for non-BM)) and for k = 2 (e.g., STRP CSI (for non-BM)), that is, based on the priority of MTRP CSI / STRP CSI, the value of k can be configured. For example, the priority of each CSI can be inversely proportional to the value of k. In other words, as the priority is higher, the value of k associated with (for) CSI can be smaller.

[0461] [Table 16]

[0462]

[0463] A2. For MTRP CSI and STRP CSI, CSI for BM can be defined separately. And, CSI for BM can be defined as a higher priority compared to CSI for non-BM, and MTRP CSI can be defined as a higher priority compared to STRP CSI. In this case, the priorities can be defined in the following order: MTRP CSI for BM>STRP CSI for BM>MTRP CSI for non-BM>STRP CSI for non-BM. The reasons and effects are the same as described in A1. Since CSI for BM is classified into MTRP CSI and STRP CSI, giving MTRP CSI a higher priority may have an advantage. Table 17 below shows an example of applying this proposal to the current standard. Specifically, Pri iCSI (y, k, c, s) can be expressed as follows, and for k = 0 (e.g., MTRP CSI for BM), for k = 1 (e.g., STRP CSI for BM), for k = 2 (e.g., MTRP CSI for non-BM), for k = 3 (e.g., STRP CSI for non-BM), it can be described as follows. In other words, the value of k can be configured based on priority, which is determined based on whether it is MTRP / STRP and the content of the CSI (e.g., CSI for BM or other CSI). For example, the priority of each CSI can be inversely proportional to the value of k. In other words, when the priority is higher, the k value associated with (for) CSI can be smaller.

[0464] Table 17 shows an example of applying the proposal of the present disclosure based on the priority rules defined in the current standard.

[0465] [Table 17]

[0466]

[0467] Meanwhile, the example of Table 16 or Table 17 corresponds to one example of applying the proposal and is not limited to being the only example of applying the proposal. Therefore, other examples that can be applied to the standard based on the proposal are possible.

[0468] For example, the priority can be determined based on whether it is MTRP CSI or STRP CSI / the content of CSI (e.g., cri / RI / PMI / CQI / LI / RSRP / SINR) / the number of MTRPs associated with CSI, etc.

[0469] At the same time, it is assumed that for the proposed priority rule, MTRP CSI has a higher priority than STRP CSI, but STRP CSI may also be defined as having a higher priority than MTRP CSI. Since STRP CSI may have a more accurate value than MTRP CSI in terms of a single TRP, there may be an environment where STRP CSI is preferred. Therefore, for this case, STRP CSI may be defined as having a higher priority than MTRP CSI. In this case, for example, the example of priority regarding the above-mentioned A1 may be defined in the order of CSI for BM (for MTRP / STRP CSI) > STRP CSI (for non-BM) > MTRP CSI (for non-BM). For example, the example of priority regarding the above-mentioned A2 may be defined in the following order: STRP CSI for BM > MTRP CSI for BM > STRP CSI for non-BM > MTRP CSI for non-BM.

[0470] For example, the above-mentioned priority rules may be predefined between the base station (or TRP) and the terminal, or the base station (or TRP) may indicate the configuration related to the above-mentioned priority rules to the terminal.

[0471] CSI sets are defined by describing the proposal, and for ease of description, CSI sets are explicitly categorized. However, when reporting CSI, each CSI set may not be explicitly categorized. Operations such as configuring report values ​​for different CSI sets (or reporting values ​​that have a mutual mapping relationship and are defined as a pair (e.g., RI1-PMI1-..., RI2-PMI2-..., etc.)) may be defined by reporting them together according to one reporting setting.

[0472] Proposal 2: A method for configuring resource sets corresponding to different TRPs to terminals in a single resource setting

[0473] Proposal 1-1: The base station may configure resource sets corresponding to different TRPs to the terminal in a single resource setting. Here, the resource setting may be a resource setting for channel measurement in a report setting.

[0474] The base station may perform such resource settings through L1 / L2 signaling to the terminal as an indication / configuration of CSI calculation to be used for multi-TRP transmission, or may be defined by a fixed rule. In addition, the base station may indicate / configure to the terminal through L1 / L2 signaling how many CSI sets (e.g., N, N is a natural number) should be reported through the corresponding resource settings, or may be defined by a fixed rule. In addition, the number of TRPs corresponding to the resource set may be defined based on the number of resource sets configured in the corresponding resource settings (e.g., M>=N, M is a natural number). When the indication / configuration is performed as described above, the terminal may select N resource sets of M resource groups for calculation / acquisition / reporting of N CSI sets. Furthermore, the N resource sets and the N CSI sets may have a one-to-one correspondence, and for this purpose, each CSI set may correspond to a resource set to which the resources used for CM belong.

[0475] The terminal may report information about the selected resource sets (i.e., CSI) to the base station. For N selected resource sets, when calculating / acquiring / reporting a specific CSI set (e.g., the jth CSI set) corresponding to a specific resource set (e.g., the i-th resource set), the resources in the specific resource set (e.g., the i-th resource set) may be used for the CM. Furthermore, resources in the (N-1) resource sets excluding the specific resource set (e.g., the i-th resource set) applied to the CM may be used for the IM of the specific CSI set (e.g., the jth CSI set).

[0476] In the above proposal, when resource sets corresponding to different TRPs in a resource setting are configured to a terminal, this may mean that when performing CSI calculation, resources included in different resource sets in the same resource setting have a CM / IM relationship with each other.

[0477] In the following, when the description is based on multiple resource sets in a resource setting for ease of description, when the time behavior of the resource setting is configured aperiodically, it can be interpreted as multiple resource sets in one triggered state.

[0478] In the following, CSI calculation for multi-TRP transmission is described.

[0479] In Proposal 2, “CSI calculation for multi-TRP transmission” may have the same meaning as that of the above-mentioned Proposal 1.

[0480] An example of a method for a base station to indicate / configure resource settings to be used for CSI calculation for multiple TRP transmissions to a terminal is as follows. The following method may correspond to an example of L1 / L2 signaling for performing the proposed operation. However, it is clear that the proposal according to the present disclosure is not limited to the following method.

[0481] -A1: For each resource setting or resource setting configured in a specific report setting, the operation can be configured by a specific parameter. For example, a parameter in the form of a flag indicating whether the operation is to be performed can be defined in the resource setting. Alternatively, when the time behavior of the resource setting is configured periodically / semi-persistently and multiple resource sets are configured, the terminal can perform the proposed operation based on the multiple resource sets configured in the corresponding resource setting. In the current standard, when the time behavior of the resource setting is configured periodically / semi-persistently, it is defined that only one resource set is configured. Therefore, when multiple resource sets are configured despite the time behavior being configured periodically / semi-persistently, it can be used under the condition that CSI calculation / acquisition / reporting considering multiple TRP transmissions is performed. And / or, when the time behavior for the resource setting is configured aperiodically and multiple resource sets are configured in one trigger state (e.g., CSI-AperiodicTriggerState / CSI-AssociatedReportConfigInfo), the terminal can perform the proposed operation based on the multiple resource sets configured in the corresponding trigger state. In the current standard, when the time behavior of a resource setting is configured aperiodically, multiple resource sets can be configured in the resource setting, but it is defined that only one resource set is connected when a specific reporting setting is triggered. Therefore, when multiple resource sets are configured in a trigger state, it can be used under the condition of performing CSI calculation / acquisition / reporting considering multiple TRP transmissions, even though the time behavior is configured aperiodically.

[0482] -A2: The operation can be configured by a specific parameter in the report setting. The parameter (e.g., reportQuantity) for configuring the CSI entry can correspond to an example of the parameter. Here, when the CSI entry for multi-TRP transmission is included in the parameter (e.g., index / hypothesis indicator for resource set combination, etc.), the proposed operation (i.e., CSI calculation for multi-TRP transmission) can be performed. When it is configured to perform the proposed operation, the value of M can be indicated / configured to the terminal based on L1 / L2 signaling, or the value of M can be defined by a fixed rule. For example, the value of M can be configured together in the corresponding report setting, or the value of M can be configured in the resource setting connected to the corresponding report setting. Alternatively, it can be determined based on the number of resource sets configured in the resource setting (periodically / semi-persistently) and / or the number of resource sets configured in the triggered state (aperiodically).

[0483] Hereinafter, the definition of a CSI set is described.

[0484] A CSI set may be defined as a value (or set / information) of one or more CSI entries including CRI / RI / PMI / L1 / CQI / L1-SINR / L1-RSRP.

[0485] Figure 19 Resource sets and CSI sets according to an embodiment of the present disclosure are illustrated.

[0486] Figure 19 An example of the relationship between N (eg, 2) CSI sets and M (eg, 3) resource sets configured in a resource setup is shown.

[0487] Figure 19 This shows an example where N and M are configured as 2 and 3, respectively. Furthermore, this shows an example where the resource set for the CM in CSI #1 (the first CSI set) is included in set #1, and the resource set for the CM in CSI #2 (the second CSI set) is included in set #2. A terminal can calculate CSI for two CSI sets using two resources included in different resource set combinations.

[0488] For example, the terminal may assume multi-TRP transmission based on TRP #1 / #2. Furthermore, the terminal may assume one of the resources in resource set (RSS) 1 as the resource for the CM used for CSI calculation of the first CSI set. Furthermore, the terminal may assume one of the resources in RSS #2 as the resource for the CM used for CSI calculation of the second CSI set. Here, the resources used for the CM in each CSI set can be used as the resources for the IM in other CSI sets.

[0489] For this operation, it is possible to perform the operation for M (eg, 3), N (eg, 2) TRP combinations (in Figure 19 3 TRP combinations in the example) and K1 (e.g., 3) × K2 (e.g., 3) resource combinations (in Figure 19 CSI calculations are performed for a total of 27 resource combinations (9 resource combinations in the example) to find a TRP combination and resource combination that is more suitable for multi-TRP transmission. Here, K1 and K2 may represent the total number of resources including the RSS of resources for CMs in the first CSI set and the total number of resources including the RSS of resources for CMs in the second CSI set, respectively.

[0490] At the same time, when the terminal should consider all TRP combinations and all resource combinations as in the example, there may be a disadvantage that the complexity of the terminal for CSI calculation becomes too high. To compensate for this disadvantage, the base station can instruct / configure the terminal through L1 / L2 signaling, and / or a specific rule can be fixedly applied between the base station and the terminal so that the terminal can only consider (one or more) specific TRPs and / or (one or more) specific TRP combinations and / or (one or more) specific resource combinations in CSI calculation.

[0491] Down Figure 20 This represents an example of applying a specific rule between the base station and the terminal so that only specific resource combinations will be considered in CSI calculation.

[0492] Figure 20 The diagram illustrates a CSI set and a resource group in a resource set according to an embodiment of the present disclosure.

[0493] Figure 20 The diagram shows that resources in different RSS can only be sorted one by one in ascending (or descending) order. Figure 20 In the example, the terminal can assume multi-TRP transmission based on TRP#1 / #2. In addition, the terminal can assume one of the resources in RSS#1 as the resource of the CM used for CSI calculation of the first CSI set. In addition, the terminal can assume the resources in the same order (or index) as the resources in RSS#1 among the resources in RSS#2 as the resources of the CM used for CSI calculation of the second CSI set. Here, the resources used for the CM in each CSI set can be used as the resources of the IM of other CSI sets.

[0494] For operations such as this example, CSI calculation can be performed only on a total of 9 resource combinations, including 3 TRP combinations and 3 resource combinations, thereby significantly reducing the amount of calculation of the terminal.

[0495] Hereinafter, another definition of a CSI set is described.

[0496] Figure 19 and Figure 20 The example illustrates a case where the same CSI items (e.g., CRI / RI / PMI / LI / CQI, etc.) are included in each CSI set. Alternatively, the CSI items included in each CSI set may be defined differently. And / or, common CSI items may be defined separately for different CSI sets.

[0497] Figure 21 and Figure 22 The diagram illustrates a CSI set and a resource group in a resource set according to an embodiment of the present disclosure.

[0498] Figure 21 represents an example of differently defining CSI entries included in each CSI set, and Figure 22 An example of defining common CSI entries for different CSI sets is shown. Figure 21 In the example of , CRI / RI / CQI included in CSI#1 can be interpreted as a value commonly applied to CSI#1 / CSI#2. Alternatively, it can be defined separately in Figure 22In the example of , a CSI set is commonly applied. For CSI entries that can be included in a CSI set, the following can be applied together. The following method illustrates L1 / L2 signaling for performing the proposed method of differently defining CSI entries included in each CSI set and / or defining common CSI entries, but is not limited to the following method.

[0499] -CRI: Different CRIs may be reported for different CSI sets. In this case, different CRIs may refer to CRIs included in different RSSs.

[0500] Alternatively, only one CRI may be reported for different CSI sets. Furthermore, resource combinations included in different RSSs may be reported based on corresponding CRI values. In this case, the corresponding CRI value may indicate the order (or index) of the resources in each RSS. Furthermore, the number of bits used for CRI reporting may be defined based on the number of resources included in a particular RSS. In this case, only one CRI may be reported instead of two, resulting in an advantage in saving the number of bits used for CRI reporting.

[0501] As an example of this method, when the value indicated by the CRI is j, each j-th resource in the RSS selected for the CSI set configuration may be selected. A detailed description of information on the RSS combination selected for the CSI set configuration will be described later.

[0502] -RI: Different RIs can be reported for different CSI sets. Alternatively, only one RI can be reported for different CSI sets, and in this case, both CSI sets can assume the same RI reported above. Therefore, when only one RI is reported, the freedom for RI selection becomes lower, but the feedback overhead for RI reporting can be reduced.

[0503] Alternatively, for different CRI sets, the RI in other CSI sets can be defined as a differential value compared to the RI of a specific CSI set based on the RI of the specific CSI set. For example, when the RI value for a first CSI set is 2 and the RI value for a second CSI set is 4, the terminal can report 2 as the RI value for the first CSI set and 2 as the RI value for the second CSI set (i.e., the differential value compared to the RI of the first CSI set). In this case, the feedback overhead for RI reporting can be reduced.

[0504] In the above method, only specific RI combinations can be limited and defined in the CSI report. For example, the terminal can only report RI combinations such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, and 4:4 for each CSI set.

[0505] Alternatively, different RIs can be reported using values ​​representing (indicating) combinations of different RI values. For example, 10 states are assumed for RI combinations such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, and 4:4. In this case, the terminal can report a different RI value for each CSI set by reporting the state value corresponding to a specific RI combination.

[0506] - Transmission of 2 codewords (CWs): When the sum of RI values ​​for different CSI sets is equal to or greater than a specific value (e.g., 5), the terminal can report 2 CQIs for 2 CWs. Here, CQI reporting for different CWs is described in detail in the following CQI section.

[0507] -PMI: For different CSI sets, different independent PMI values ​​can be reported based on the PM (precoding matrix) defined in the standard.

[0508] Alternatively, for different CSI sets, based on the PMI of a specific CSI set, the PMIs in other CSI sets can be defined as differential values ​​compared to the PMI of the specific CSI set. For example, the PMI index value(s) for a first CSI set can be reported as is, and the PMI index value(s) for a second CSI set can be reported as differential values ​​compared to the PMI index value(s) for the first CSI set. In this case, the feedback overhead for PMI reporting can be reduced. This example may assume that a separate PM is applied to each resource corresponding to a different CSI set.

[0509] -CQI: For different CSI sets, different independent CQI values ​​may be reported. Here, the SINR assumption for each CQI may be different. For example, CSI#1 may be defined as SINR1=S1 / (I 2,intf +I 1,MU1 +I 1,MU2 +I intf +N), and CSI#2 can be defined as SINR2=S2 / (I 1,intf +I 2,MU1 +I 2,MU2 +I intf +N). Here, S1 and S2 may represent the signal power of the TRP1 channel and the signal power of the TRP2 channel, respectively.1,intf and I 2,intf I can represent the interference signal power of TRP 1 channel and the interference signal power of TRP 2 channel respectively. 1,MU1 and I 2,MU2 I can represent the interference signal power of the MU channel of TRP 1 to TRP 1 and the interference signal power of the MU channel of TRP 2 to TRP 1 respectively. 1,MU1 and I 2,MU1 I can represent the interference signal power of the MU channel of TRP 1 to TRP 2 and the interference signal power of the MU channel of TRP 2 to TRP 2 respectively. intf It can represent the overlapping interference signal power ( / TRP) from between cells. N can represent the size of the noise.

[0510] Meanwhile, when the base station transmits signals from different TPRs simultaneously (e.g., for NCJT), the receiving SINR of the terminal can be defined as SINR NCJT =(S1+S2) / (I 1,intf +I 2,intf +I 1,MU1 +I 1,MU2 +I 2,MU1 +I 2,MU2 +I intf +N). As in the example described in the formula, when different independent CQI values ​​only consider the signal power of a specific TRP, it can have a different value from the CQI in actual multi-TRP transmission (for example, for NCJT). Therefore, the base station can instruct / configure the terminal to report a (single) CQI considering multi-TRP transmission (for example, for NCJT) through L1 / L2 signaling, or it can be defined by a fixed rule. In this case, the terminal can report only one CQI for different CSI sets. When only one CQI is reported as described above, it can represent the CQI for 1CW transmission.

[0511] -Describes the relationship between the PDSCH transmission layer / (one or more) antenna ports for PDSCH (DMRS) / (one or more) antenna ports for CSI-RS / precoder in CQI calculation (operation):

[0512] In the current standard, the UE assumes that the PDSCH signal in the antenna port set [1000, ..., 1000+v-1] for v layers is equivalent to the signal corresponding to the corresponding symbol transmitted from the antenna port [3000, ..., 3000+P-1], as shown in the following equation 11.

[0513] [Equation 11]

[0514]

[0515] x(i)=[x (0) (i)...x (v-1) (i)] T is the vector of PDSCH symbols generated from layer mapping. P∈{1,2,4,8,12,16,24,32} is the number of CSI-RS ports.

[0516] In the current standard, one resource is assumed in the CSI calculation and, therefore, has one RI / PMI. Therefore, in the CQI calculation defined in the standard, only one RI and PM are also considered in the relationship of the transport layer of PDSCH / (one or more) antenna ports for PDSCH (DMRS) / (one or more) antenna ports for CSI-RS / precoder. However, in the CSI calculation considering multi-TRP transmission, it can have each RI / PMI value corresponding to a different CSI-RS resource for a different CSI set. Therefore, in this case, the relationship between the CSI-RS port / RI / precoder corresponding to different resources corresponding to different CSI sets and the transport layer for PDSCH / antenna port for PDSCH (DMRS) should be defined.

[0517] -Method of reporting 1 CQI for transmission of 1 CW

[0518] For example, when the sum of RIs corresponding to different CSI sets is equal to or less than 4, 1 CQI for transmitting 1 CW may be reported. In this case, the CQI may be determined based on the following method.

[0519] 1) For CSI-RS ports and precoders, the order (or index, or order, or mapping) for CQI calculation can be defined based on the order (or index, or order (eg, ascending or descending)) of the CSI sets. The following equation 12 represents an example of this method.

[0520] [Equation 12]

[0521]

[0522] In formula 12, y (p) CSI1 (i) and y (p) CSI2 (i) may represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the first CSI set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the second CSI set, respectively. CSI1 and P CSI2The numbers W and W may represent the number of CSI-RS ports of resources corresponding to the first CSI set and the number of CSI-RS ports of resources corresponding to the second CSI set, respectively. CSI1 (i) and W CSI2 (i) may represent PM corresponding to the first CSI set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the second CSI set (eg, PM selected by the terminal / selected by a rule), respectively. 0 may represent a matrix configured with all elements set to 0.

[0523] For the CSI-RS ports defined in Equation 12, it can be assumed that the signal corresponding to the symbol sent from the corresponding antenna port in the order of the vector is the same as the signal sent from the [1000,…,1000+v-1] port where the PDSCH is transmitted. Here, the symbols mapped to each layer can follow the definition of the standard. It can refer to the mapping relationship between each layer and the DMRS port. In addition, these contents can also be applied to the following proposals. For example, in the CQI calculation, the UE assumes that the PDSCH signal in the antenna port set [1000,…,1000+v-1] for v layers is equivalent to the signal at the antenna port [3000 CSI1 ,...,3000 CSI1 +P CSI1 -1,3000 CSI2 ,...,3000 CSI2 +P CSI2 -1] is the signal corresponding to the corresponding symbol sent in [x]. (0) (i)...x (v-1) (i)] T is a vector of PDSCH symbols generated by layer mapping.

[0524] 2) For CSI-RS ports and precoders, the order (or index, or order, or mapping) for CQI calculation can be defined based on the RI size of the CSI set (eg, ascending or descending order). The following equation 13 represents an example of this method.

[0525] [Equation 13]

[0526]

[0527] In formula 13, y (p) CSIa (i) and y (p) CSIb (i) may represent the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set. CSIa and PCSIb The number of CSI-RS ports of resources corresponding to the CSIa set and the number of CSI-RS ports of resources corresponding to the CSIb set can be represented respectively. CSIa (i) and W CSIb (i) may represent PM corresponding to the CSIa set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the CSIb set (eg, PM selected by the terminal / selected by a rule). 0 may represent a matrix configured with all elements set to 0.

[0528] In this formula, for CSIa and CSIb, the order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb For example, when assuming the first condition, for RI CSI1 , RI CSI2 =2, 1, CSIa and CSIb may correspond to CSI1 and CSI2 respectively. Meanwhile, when the RIs of different CSI sets are the same, the order may be defined based on the method in 1).

[0529] -Method of reporting 2 CQIs for transmission of 2 CWs

[0530] For example, when the sum of RIs corresponding to different CSI sets is equal to or greater than 5, 2 CQIs for transmission of 2 CWs may be reported. In this case, each CQI corresponding to a different CW may be determined based on the following method.

[0531] 1) For CSI-RS ports and precoders, the order (or index, or order, or mapping) of CQI calculation can be defined based on the order (or index, or order (e.g., ascending or descending)) of the CSI sets. Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can (sequentially) correspond to transmission layers of different LGs. For example, the PMs in CSI set 1 can (sequentially (e.g., in ascending / descending order)) correspond to transmission layers belonging to LG1, and the PMs in CSI set 2 can (sequentially (e.g., in ascending / descending order)) correspond to transmission layers belonging to LG 2. The following Equation 14 represents an example of this method.

[0532] [Equation 14]

[0533]

[0534] In formula 14, y (p) CSI1 (i) and y (p) CSI2(i) may represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the first CSI set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the second CSI set, respectively. CSI1 and P CSI2 The numbers W and W may represent the number of CSI-RS ports of resources corresponding to the first CSI set and the number of CSI-RS ports of resources corresponding to the second CSI set, respectively. CSI1 (i) and W CSI2 (i) may represent PM corresponding to the first CSI set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the second CSI set (eg, PM selected by the terminal / selected by a rule), respectively. 0 may represent a matrix configured with all elements set to 0.

[0535] In formula 14, v 1 LG1 and v 1 LG2 They can represent the first-level index of the first LG and the first-level index of the second LG, respectively.

[0536] In this method, transmission layers corresponding to different LGs may be defined based on all RI values, and an example may be as follows. For example, for RI=5 / 7 / 8, v may be defined. LG1 ={2,3,6,7}, v LG2 ={0,1,4,5} or v LG2 ={2,3,6,7}, v LG1 ={0,1,4,5}. In another example, for RI=6, we can define v LG1 ={2,3,5}, v LG2 ={0,1,4} or v LG2 ={2,3,5}, v LG1 ={0,1,4}.

[0537] Based on the example of LG, when the RI values ​​of different CSI sets are different, LG2 may correspond to the CSI set with the larger RI value. In other words, for all RI values, the LG including the layer corresponding to the CW with the larger RI value may correspond to the CSI set with the larger RI value.

[0538] Alternatively, when different CSI sets have the same RI value, the CSI sets and LGs may correspond to each other based on a specific order (eg, ascending / descending order).

[0539] The reason why LG can be classified as described above is as follows: As described in the following standard, based on TS38.212, when a DMRS port index is indicated to a terminal through DCI, it is defined as corresponding to a transport layer in the indicated DMRS port order.

[0540] For example, (one or more) antenna ports - 4, 5 or 6 bits, where the number of CDM groups without the value 1, 2, 3 refers to each CDM group {0, {0, 1}, {0, 1, 2}. The antenna ports {p0, ..., p v-1}.

[0541] Meanwhile, when multiple TCI states are indicated to the terminal for multi-TRP transmission, each TCI state and DMRS port may be defined as follows in TS38.214 so that they can be mapped to each other based on a CDM group including a DMRS port.

[0542] Example) When the UE is not indicated as including the DCI of "time domain resource assignment" (the "time domain resource assignment" is a DCI field indicating an entry in the pdsch-TimeDomainAllocationList including RepNumR16 in PDSCH-TimeDomainResourceAllocation), and 2 TCI states in the code point of the DCI field "Transmission Configuration Indication" are indicated, and (one or more) DM-RS ports in 2 CDM groups in the DCI field "(one or more) antenna ports" are indicated, the first TCI state corresponds to the CDM group of the first antenna port indicated by the antenna port indication table, and the second TCI state corresponds to the other CDM groups.

[0543] According to the above, when multiple TCI states are indicated to the terminal for multi-TRP transmission, each TCI state can be mapped to a DMRS port included in a specific CDM group. In addition, the DMRS ports are sequentially mapped to the transport layer in the order defined in the standard. Therefore, when two CWs are transmitted, the DMRS ports corresponding to different TCI states can correspond to the layer corresponding to the specific CW. In other words, specific CWs can be mapped to different TRPs together without being mapped to a specific TRP.

[0544] Table 18 below shows the mapping relationship between each CW / layer / DMRS port / CDM group when sending 5 layers according to the current standard. (DMRS type 1 is shown)

[0545] [Table 18]

[0546]

[0547] As shown in Table 18, for CW1, it can be shown that DMRS ports corresponding to different CDM groups (i.e., corresponding to different TRPs) are mapped. When the terminal calculates the CQI of different CWs, the mapping relationship should be reflected. For example, according to the mapping relationship of the layer DMRS port CDM group in the table, layers 0, 1, and 4 can correspond to TRP 1, and layers 2 and 3 can correspond to TRP2. Therefore, in the CQI calculation of CW1, the third layer of TRP 1 and the first and second layers of TRP 2 can be layers of transmitted signals and can be calculated as signal power in the CQI calculation. On the other hand, the first and second layers of TRP 1 corresponding to CW0 can be interference layers for CW1 and can be calculated as interference power in the CQI calculation for CW1.

[0548] As described in the example of Table 18, the layer corresponding to each CW may classify the layer group (LG) based on a mapping relationship of layer-DMRS port-CDM group (ie, based on the CDM group to which the layer will correspond).

[0549] Figure 23 Illustrated is information about a CDM group and a DMRS port corresponding to each layer based on all RIs according to an embodiment of the present disclosure.

[0550] 2) For CSI-RS ports and precoders, the order (or index, or order, or mapping) for CQI calculation can be defined based on the RI size of the CSI set (e.g., ascending or descending order). Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can (sequentially) correspond to transmission layers of different LGs. For example, the PMs in CSI set 1 can (sequentially (e.g., in ascending / descending order)) correspond to transmission layers belonging to LG 1, and the PMs in CSI set 2 can (sequentially (e.g., in ascending / descending order)) correspond to transmission layers belonging to LG 2. The following formula 15 represents an example of this method.

[0551] [Equation 15]

[0552]

[0553] In formula 15, y (p) CSIa (i) and y (p) CSIb (i) may represent the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and the symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set. CSIa and P CSIbThe number of CSI-RS ports of resources corresponding to the CSIa set and the number of CSI-RS ports of resources corresponding to the CSIb set can be represented respectively. CSIa (i) and W CSIb (i) may represent PM corresponding to the CSIa set (eg, PM selected by the terminal / selected by a rule) and PM corresponding to the CSIb set (eg, PM selected by the terminal / selected by a rule). 0 may represent a matrix configured with all elements set to 0.

[0554] In this formula, for CSIa and CSIb, the order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb For example, when assuming the first condition, for RI CSI1 ,RI CSI2 =3, 2, CSIa and CSIb may correspond to CSI1 and CSI2 respectively. Meanwhile, when the RIs of different CSI sets are the same, the order may be defined based on the method in 1).

[0555] In Equation 15, v 1 LG1 and v 1 LG2 They can represent the first-level index of the first LG and the first-level index of the second LG, respectively.

[0556] In this method, transmission layers corresponding to different LGs may be defined based on all RI values, and an example may be as follows. For example, for RI=5 / 7 / 8, v may be defined. LG1 ={2,3,6,7}, v LG2 ={0,1,4,5} or v LG2 ={2,3,6,7}, v LG1 ={0,1,4,5}. In another example, for RI=6, we can define v LG1 ={2,3,5}, v LG2 ={0,1,4} or v LG2 ={2,3,5}, v LG1 ={0,1,4}.

[0557] Based on the example of LG, when the RI values ​​of different CSI sets are different, LG2 may correspond to the CSI set with the larger RI value. In other words, for all RI values, the LG including the layer corresponding to the CW with the larger RI value may correspond to the CSI set with the larger RI value.

[0558] Alternatively, when different CSI sets have the same RI value, the CSI sets and LGs may correspond to each other based on a specific order (eg, ascending / descending order).

[0559] -LI (Layer Indicator): Different independent LI values ​​can be reported for different CSI sets. Whether to report different independent L1 values ​​and / or the number of LI values ​​reported in each CSI set can be indicated by L1 / L2 signaling and / or can be determined based on a fixed rule. For example, the number of LI values ​​to be reported can be determined based on the maximum number of PTRS ports configured in the terminal. For example, when the maximum number of PTRS ports is configured as 2, two different LI values ​​can be reported in each CSI set. For example, when N is 2 (i.e., there are two CSI sets), the LI value for each CSI set and / or the number of bits required to report the LI value can be determined based on the RI and / or PMI reported in each CSI set. For example, when the RI value corresponding to a particular CSI set is assumed to be v, the number of bits required to report the LI value for the particular CSI set can be determined based on the number of ports configured with resources corresponding to the corresponding CSI set. For example, a value such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)) can be determined. In addition, the reported LI value may represent the strongest layer index corresponding to a specific column of the PM corresponding to the PMI of the corresponding CSI set. Meanwhile, when the maximum number of PTRS ports is configured as 1, one LI value may be reported. Alternatively, an LI value selected for a specific CSI set may be reported, and LI values ​​fixed to specific values ​​for the remaining N-1 CSI sets may be reported.

[0560] -A1. When one LI value is reported for different CSI sets and independent CQIs are reported in different CSI sets: the number of bits required to report the corresponding LI can be determined based on the maximum value (e.g., v) of the RI values ​​included in all CSI sets and the number of ports configuring the resources corresponding to the CSI set including the maximum RI value. For example, a value such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)) can be determined. Here, the CSI set corresponding to the reported LI value can be determined based on the RI / CQI included in each CSI set. For example, the CSI set corresponding to the reported LI value can be determined as a CSI set with a larger CQI, and / or (when the CQI is the same) can be determined as a CSI set with a larger RI value, and / or (when the CQI / RI is the same) can be determined as a specific CSI set (e.g., the first CSI set). The reported LI value can represent the strongest layer index corresponding to a specific column of the PM of the PMI corresponding to the corresponding CSI set.

[0561] -A2. When one LI value is reported for different CSI sets and one CQI is reported for different CSI sets: the number of bits required for reporting the corresponding LI can be determined based on the maximum value (e.g., v) of the RI values ​​included in all CSI sets and the number of ports configuring the resources corresponding to the CSI set including the maximum RI value. For example, a value such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)) can be determined. Here, the CSI set corresponding to the reported LI value can be determined based on the RI included in each CSI set. For example, the reported LI value can be determined as a CSI set with a larger RI value, and / or (when the RI is the same) can be determined as a specific CSI set (e.g., the first CSI set). And / or, the CSI set corresponding to the reported LI value can be determined as a CSI set with a larger signal power / larger SINR. The reported LI value can represent the strongest layer index corresponding to a specific column of the PM of the PMI corresponding to the corresponding CSI set.

[0562] At the same time, when an LI value is reported in the proposal, a variable for reporting whether the LI value is reported can be defined by which CSI set in multiple CSI sets it corresponds to. For example, a specific CSI set in two CSI sets can be reported by 1 bit of information. Alternatively, a rule can be defined so that the reported LI value will correspond to a specific CSI set. For example, when reporting an LI value, it can be defined as corresponding to the first (or lowest / highest) CSI set. Here, for the terminal, the order of the RI / PMI to be reported in each CSI set can be arranged based on the LI value. For example, the RI / PMI corresponding to the LI value, etc. can correspond to the first CSI set, and the remaining CSI can correspond to the remaining CSI sets to report them to the base station.

[0563] For the reported RI / PMI, a mutual pair may be defined, and the reporting method / reporting information amount, etc. of the PMI may be determined based on the paired RI value.

[0564] Hereinafter, a method of reporting information on a combination of resource sets (RSSs) selected for CSI set configuration is described.

[0565] In the above proposal, M resource sets configured with one or more resources are defined in a resource setting. According to the proposal, N of the M RSSs can be selected, and here, the terminal should report to the base station which RSS combination is used to calculate / acquire / report CSI.

[0566] At the same time, in order to omit reporting on such selected RSS, the base station may be instructed / configured to calculate / acquire / report CSI for N CSI sets based on N RSSs, or may be defined by a fixed rule. In addition, the terminal may not report information about the RSS to the base station.

[0567] However, although the same number of RSSs as CSI sets are configured, there may be a situation where the terminal can determine that the performance of a single TRP transmission considering a specific TRP is better than the performance of a multi-TRP transmission considering N TRPs. For example, it may correspond to a situation where the CQI considering a single TRP transmission is higher than the CQI considering multiple TRP transmissions when the total number of ranks is the same / similar. Therefore, when the number M of RSSs configured / included in the resource setting is the same as and greater than the number N of CSI sets that should be reported, the terminal should report to the base station which RSS group is used to report the CSI set. To this end, when reporting N CSI sets, the terminal can report standard information about N or N or fewer RSS groups to the base station. For such reporting, the following method can be applied.

[0568] -A1: The terminal can report N or fewer specific RSSs based on a bitmap configured with M bits.

[0569] -A2: A bit field may be defined that may indicate Combination(M,N)+Combination(M,N-1)+...+Combination(M,1) RSS combinations, and the terminal may report N or fewer specific RSSs based on the correspondence between the corresponding bit field and the specific RSS combination.

[0570] When the number of RSS reported according to the proposal is less than N, the CSI configuring N-1 CSI sets (e.g., CRI / RI / PMI / LI / CQI, etc.) can be fixed to a specific value. Alternatively, the information / size of part 1 / 2 can be determined based on the number of RSS reported to the base station. Information about part 1 / 2 is defined in TS38.214 and includes the following. Part 1 is used to identify the number of information bits in part 2 with a fixed payload size. Part 1 should be fully transmitted before part 2.

[0571] In addition to this proposal, to reduce the feedback overhead and complexity of CSI calculation in the terminal, it can be defined that CSI is calculated / acquired / reported only for specific candidates among all RSS combination candidates combined with M RSSs based on L1 / L2 signaling and / or fixed rules. Tables 19 to 21 below show such examples.

[0572] [Table 19]

[0573] candidate Report RSS#1 open RSS#2 open RSS#3 open RSS#1-#2 open RSS#1-#3 open RSS#2-#3 open

[0574] [Table 20]

[0575] candidate Report RSS#1 close RSS#2 close RSS#3 close RSS#1-#2 open RSS#1-#3 open RSS#2-#3 open

[0576] [Table 21]

[0577] candidate Report RSS#1 open RSS#2 close RSS#3 open RSS#1-#2 close RSS#1-#3 open RSS#2-#3 close

[0578] In the examples of Tables 19 to 21, M and N assume the cases of being configured with 3 and 2, respectively. Table 19 represents an example of being configured to perform CSI calculation / acquisition / reporting for all possible RG combinations. On the other hand, Tables 20 and 21 represent examples of being configured not to consider specific RG combinations. Table 20 represents an example of being configured not to perform CSI calculation / acquisition / reporting for a single TRP transmission. Table 21 represents an example of being configured not to perform CSI calculation / acquisition / reporting including the TRP corresponding to RSS#2. In other words, Table 21 is an example of being configured not to calculate / acquire / report CSI including the TRP corresponding to a specific RSS. (In other words, it can be configured to calculate / acquire / report CSI including only the TRP corresponding to a specific RSS.) The base station can configure the operation of the terminal through specific parameters in each report setting.

[0579] When configured to calculate / acquire / report CSI only for a specific candidate among all RSS combination candidates based on a proposal, the configuration (and / or size) of the CSI payload can be determined based on the "specific candidate". For example, for the example of Table 19, 3 bits indicating a specific RSS combination among a total of 6 candidates should be included in the CSI payload. However, in the examples of Table 20 or Table 21, CSI can be calculated / acquired / reported only for 3 candidates out of a total of 6 candidates, so only 2 bits indicating a specific RSS combination among the 3 candidates can be included in the CSI payload. And / or, it can be defined to maintain (i.e., fixed at a specific size) the size of the CSI payload and fixedly report a specific value (e.g., zero padding) for a specific payload.

[0580] Alternatively, when it is configured to calculate / acquire / report CSI only for a specific candidate among all RSS combination candidates based on a proposal, the number of CPUs (CSI processing units) used for CSI reporting can be determined based on the "specific candidate." For example, in the example of Table 19, the number of CPUs used for CSI calculation / acquisition / reporting for a total of six candidates should be considered. However, in the examples of Table 20 or Table 21, CSI can be calculated / acquired / reported for only three of the six candidates, and thus the number of CPUs used to consider only three candidates can be defined.

[0581] At the same time, in addition to this proposal, it may be defined as being necessary to calculate / acquire / report the CSI of a specific candidate among all RSS combination candidates that may be implemented with M RGs based on L1 / L2 signaling and / or fixed rules. For example, the terminal may be defined as calculating / acquiring / reporting the CSI related to a single TRP transmission. In the example of Table 19, the terminal may calculate / acquire CSI based on the resources in RSS#1 / #2 / #3 to calculate / acquire / report the CSI for a single TRP transmission, and may report to the base station the CSI calculated / acquired based on the specific resources in the specific RSS that is most preferred when assuming a single TRP transmission (e.g., the highest SINR / CQI / RI / throughput, etc.). The CSI for a single TRP transmission may always be reported regardless of the CSI for multiple TRP transmissions, and furthermore, the CSI for multiple TRP transmissions (e.g., for NCJT / URLLC, etc.) may be reported together. In other words, the example of Table 19 may represent a case where the CSI for a single TRP and the CSI for multiple TRPs are always reported together to the base station. As described above, when the terminal always reports the CSI for a single TRP regardless of the CSI for multiple TRPs, the base station may know the CSI of a single TRP suitable for a specific terminal when the base station may not be able to perform multiple TRP transmission for any reason (although multiple TRP transmission is better for a specific terminal). Therefore, there is an advantage that scheduling suitable for a specific terminal can be performed.

[0582] And / or, when it is necessary to calculate / acquire / report CSI for a specific candidate based on a proposal and at the same time when whether to report CSI for a specific candidate is variable (selective), a state that can indicate whether reporting is performed can be defined together in the CSI payload for reporting a specific RSS combination. For example, when it is defined / configured to calculate / acquire / report CSI related to a single TRP transmission and is defined / configured to report CSI related to multiple TRP transmissions based on the selection of the terminal, a state related to "not reporting" can be defined in the CSI payload for reporting RSS combinations related to multiple TRP transmissions. In the example of Table 19, there are three RG combinations {#1,#2}, {#1,#3}, {#2,#3} related to multiple TRP transmissions, and since the state of "not reporting" is added thereto, the CSI payload can be configured with 2 bits for a total of 4 states.

[0583] And / or, states related to reporting / partial reporting (e.g., for CSI omission) / non-reporting may be defined by adding or replacing states for "non-reporting."

[0584] The relationship between the resource set in the resource setting and the CSI-IM / NZP CSI-RS configured in the resource setting for IM is described.

[0585] refer to Figure 14 (a) As defined in TS 38.214, the NZP CSI-RS resource for the resource setting of the CM connected to the reporting setting and the CSI-IM resource for the IM are mapped to each other on a resource-by-resource basis when calculating CSI. For example, when calculating CSI, a first NZP CSI-RS resource may be used together with a first CSI-IM resource, and when calculating CSI, a second NZP CSI-RS resource may be used together with a second CSI-IM resource.

[0586] Reference again Figure 14 (b) When the NZP CSI-RS resource for IM is configured in the reporting settings, only one of the NZP CSI-RS resource for CM and the CSI-IM resource for IM can be configured. Furthermore, when calculating CSI, the NZP CSI-RS resource, the CSI-IM resource, and the NZP CSI-RS resource for IM can be applied together.

[0587] At the same time, when multiple resource sets in the resource setting are configured according to the proposal, it is necessary to define the relationship between the resources in the multiple resource sets in the resource setting and the CSI-IM / NZP CSI-RS resources configured in the resource setting for IM for CSI calculation, and for this purpose, it can be defined as follows.

[0588] Figures 24 to 26 is a diagram illustrating a mapping relationship between resources for channel measurement and resources for interference measurement according to an embodiment of the present disclosure.

[0589] - CSI-IM resources configured in the resource setting for IM can be mapped to each other in resource units per resource set (RSS).

[0590] refer to Figure 24 For example, when calculating CSI, the first NZP CSI-RS resource in the first RSS can be applied together with the first CSI-IM resource, and when calculating CSI, the first NZP CSI-RS resource in the second RSS can also be applied together with the first CSI-IM resource.

[0591] Alternatively, refer to Figure 25 , CSI-IM resources can be mapped to specific RSSs (e.g., Figure 25 Included in RSS other than the specified RSS (e.g., Figure 25 The resources mapped to the CSI-IM resources (e.g., Figure 25The resource #1 of RSS #1 in the RSS may be mapped to a resource assumed for IM between RSSs (e.g., Figure 25 Resource #1 of the CSI-IM resource in ).

[0592] - When configuring NZP CSI-RS resources in the resource setting for IM, only one resource in the resource set may be configured, and when performing CSI calculation, the NZP CSI-RS resources, CSI-IM resources, and NZP CSI-RS resources for IM in each resource set may be applied together. For example, refer to Figure 26 , when performing CSI calculation, resource #1 in RSS #1, CSI-IM resource #1, and NZP CSI-RS resource #1 for IM may be applied together.

[0593] In the following, methods for configuring different QCL-typeD reference resources are described.

[0594] The above proposal assumes that no QCL-type D is configured for resources included in different RSSs, or that the same QCL-type D is configured on a resource-by-resource basis. As described in "Relationship between Resource Sets in a Resource Setting and CSI-IM / NZP CSI-RS Configured in a Resource Setting for IM," this proposal applies equally to CSI-IM resources for IM and NZP CSI-RS resources mapped to resources in each RSS.

[0595] At the same time, it is necessary to support situations in which different QCL-type D RSs are configured by considering frequency bands higher than FR 1. For example, when a terminal can be equipped with multiple panels and simultaneously receives signals by using multiple receiving beams, the terminal can receive (one or more) PDSCHs configured with multiple QCL-type D RSs. In this case, different QCL-type D RSs need to be configured for resources included in different RSSs to obtain / report CSI considering multiple TRP transmissions. To this end, the terminal can report relative UE capabilities to the base station. UE capability can be an indication of the ability of a terminal to simultaneously receive signals through multiple spatial domain receive filters based on different QCL-type DRSs. The base station can, based on the UE capability, configure different QCL-type D RSs for resources corresponding to different RSSs for the corresponding terminal for CSI calculation considering multiple TRP transmissions. When different QCL-type D RSs are configured for resources corresponding to different RSSs, the terminal can receive resources through multiple spatial domain receive filters (i.e., through multiple panels) based on different QCL-type DRSs. The same applies to CSI-IM resources and NZP CSI-RS resources for IM, which are mapped to resources in each RSS described in "Relationship between Resource Sets in a Resource Configuration and CSI-IM / NZP CSI-RS Configured in a Resource Configuration for IM." Furthermore, resources corresponding to different RSSs are configured with different QCL-type D RSs but can be defined to be transmitted in the same OFDM symbol. Furthermore, resources corresponding to different RSSs can have a one-to-one correspondence between the different RSSs.

[0596] Figure 27 The diagram illustrates an operation of receiving a CSI-RS configured with a plurality of different QCL type D reference resources according to an embodiment of the present disclosure.

[0597] As shown in the following Equation 16, an operation of receiving CSI-RS through multiple spatial domain reception filters (ie, through multiple panels) based on different QCL-type D RSs may be expressed.

[0598] [Equation 16]

[0599]

[0600] In formula 16, y 2×1 can represent the vector of the received signal, and n 2×1 x1 may represent the transmission signal of the CSI-RS port in TRP 1, and x2 may represent the transmission signal of the CSI-RS port in TRP 2. i,p,jIt can represent the channel coefficient between the CSI-RS port of the i-th TRP and the j-th receiving port of the p-th panel of the terminal. As in the above example, the receiving beams of panel 1 and panel 2 can be different from each other. There is an explanation for configuring different QCL-TypeD RSs for different CSI-RS resources (for CM) considered when performing CSI calculation considering multi-TRP transmission. In other words, it is assumed that the QCL-TypeD RS of resource #a included in the RSS#1 corresponding to TRP 1 is configured as A, and the QCL-TypeD RS of resource #b included in the RSS#2 corresponding to TRP 2 is configured as B. And, it is assumed that the two resources correspond to different CSI sets respectively. In this case, the terminal can simultaneously receive CSI-RS in a specific resource through different receiving beams. And, the terminal can estimate h by using the received signal of each receiving port of the terminal through the CSI-RS transmitted by resource #a 1,1,1 +h 1,2,1 and h 1,1,2 +h 1,2,2 , and estimate h using the received signal of each receiving port of the terminal through the CSI-RS transmitted by resource #b 2,1,1 +h 2,2,1 and h 2,1,2 +h 2,2,2 .

[0601] Equation 16 assumes that the terminal does not classify the receive antenna ports of different panels. Meanwhile, the terminal can also receive signals by classifying the receive antenna ports of different panels. Equation 17 below illustrates an example of a terminal receiving signals by classifying the receive antenna ports of different panels.

[0602] [Equation 17]

[0603]

[0604] As in the above example, it is assumed that the QCL-TypeD RS of resource #a included in RSS #1 corresponding to TRP 1 is configured as A, and the QCL-TypeD RS of resource #b included in RSS #2 corresponding to TRP 2 is configured as B. Furthermore, it is assumed that the two resources correspond to different CSI sets. In this case, the terminal can simultaneously receive CSI-RS in a specific resource through different receive beams. Furthermore, the terminal can estimate h using the received signal of each receive port of the terminal using the CSI-RS transmitted by resource #a. 1,1,1 ,h 1,2,1 ,h 1,1,2 and h 1,2,2, and estimate h using the received signal of each receiving port of the terminal through the CSI-RS transmitted by resource #b 2,1,1 ,h 2,2,1 ,h 2,1,2 ,h 2,2,2 .

[0605] In order to apply this method, multiple different QCL-Type D RSs can be configured for CSI-RS resources (based on UE capabilities). When different QCL-Type D RSs are configured for CSI-RS resources, the terminal can receive the resources through multiple receive filters (i.e., spatial domain receive filters) based on different QCL-Type D RSs. Here, for the corresponding terminal, in order to consider the CSI calculation of multi-TRP transmission, the multiple QCL-Type D RSs configured for resources corresponding to different RSSs can be defined as the same. For example, when the QCL-Type D RS of resource #a included in RSS#1 corresponding to TRP 1 is configured as A and B, the QCL-Type D RS of resource #b included in RSS#2 corresponding to TRP 2 can be configured as A and B. It can be equally applied to the CSI-IM resources and NZP CSI-RS resources for IM that are mapped to the resources in each RSS described in "Relationship between the resource set in the resource setting and the CSI-IM / NZP CSI-RS configured in the resource setting for IM".

[0606] In the following, a CSI processing unit considering CSI for multi-TRP transmission is described.

[0607] TS 38.214 defines a CSI processing unit (CPU), which represents the number of CSIs that can be simultaneously calculated by a terminal. The number of CPUs occupied is defined differently depending on the reporting quantity configured in the reporting settings (e.g., the parameter reportQuantity). Table 22 below shows a portion of the description of the CPUs defined in the standard.

[0608] [Table 22]

[0609]

[0610]

[0611] In addition to the definition in Table 22, when CSI considering multi-TRP transmission is introduced, the complexity of the terminal may increase compared to the existing operation, so a new CPU definition to reflect it may be introduced. Table 23 illustrates a method for defining the number of CPUs required for CSI calculation for multi-TRP transmission based on the number of CPUs defined according to the higher-layer parameter reportQuantity in the current standard. In other words, it may correspond to 0 in the standard description. CPU .

[0612] In Table 14 below, various options are presented by combining A1-1, A1-2, A2-1, A2-2, A3-1, A3-2, B1, and B2, but not all of them are necessarily used. Only options based on any one combination may be used, or options based on two or more combinations may be selectively used under specific conditions.

[0613] For ease of description, "CSI considering multiple TRP transmissions" may be referred to as mTRP CSI. And, "CSI considering multiple TRP transmissions" may be configured to the terminal through the reportQuantity of CSI-ReportConfig. "CSI considering multiple TRP transmissions" may be defined as including values ​​of (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc., and / or "CSI considering multiple TRP transmissions" may represent / include the case where beam / RS pair information is configured. And / or, "CSI considering multiple TRP transmissions" may represent / include the case where multiple resource groups are configured in a resource set. And / or, "CSI considering multiple TRP transmissions" may represent / include the case where multiple resource sets are configured in a resource setting. And / or, "CSI considering multiple TRP transmissions" may represent / include the case where multiple CSI sets are configured. CSI opposite to MTRP CSI may be referred to as STRPCSI (i.e., single TRP CSI), which may represent the previously defined CSI.

[0614] [Table 23]

[0615]

[0616] In Table 23, N s Indicates the number of RSSs (resource sets) corresponding to a reporting setting (or triggering state) (for CSI feedback considering multiple TRP transmissions). S Represents the number of all resources included in a resource set. C(M,2) represents the number of combinations of selecting 2 RSSs for all RSSs (e.g., M RSSs). Here, 2 is only an example and is not limited thereto and can be generalized to N. K s' represents the number of resources included in one RSS. In Table 23, for convenience, it is assumed that for all RSSs, the number of resources in the RSS is the same as K s ' is the same, but it is also possible to consider the case where the quantity is defined differently.

[0617] Hereinafter, each case is described by referring to Table 23.

[0618] A1-1: When all possible CRI combinations for different RSSs are calculated, and here, operations are performed by independently changing the RI / PMI, etc. in the resources of each RSS (and / or when each CRI combination in each RSS combination is calculated and operations are performed by independently changing the RI / PMI, etc. in each resource)

[0619] A1-2: When calculating a specific CRI combination for different RSSs (e.g., a combination having a one-to-one correspondence, first-first, second-second, ...), and performing an operation by independently changing the RI / PMI, etc. in the resources of each RSS (and / or when calculating each CRI combination in each RSS combination (CRI combinations are limited based on a specific rule) and performing an operation by independently changing the RI / PMI, etc. in each resource)

[0620] A2-1: When all possible CRI combinations for different RSSs are calculated, but after selecting a specific CRI combination for the different RSS combinations (e.g., assuming that the CSI of a single TRP can be used for selection), the operation is performed by independently changing the RI / PMI, etc. in the selected resources of each RSS for the different RSS combinations (and / or when the operation is performed by independently changing the RI / PMI, etc. in each resource for the selected CRI combination in each RSS combination (e.g., by a single TRP CSI))

[0621] A2-2: When specific CRI combinations for different RSSs are calculated (e.g., combinations having a one-to-one correspondence, first-first, second-second, ...), but after selecting specific CRI combinations for different RSS combinations (e.g., assuming that CSI of a single TRP can be used for selection), operations are performed by independently changing the RI / PMI, etc. in selected resources for each RSS of the different RSS combinations (when operations are performed by independently changing the RI / PMI, etc. in each resource for the selected CRI combination in each RSS combination (CRI combinations are limited based on specific rules) (e.g., by a single TRP CSI))

[0622] A3-1: When all possible CRI combinations for different RSSs are calculated, but after selecting a specific CRI combination for all RSSs (for example, assuming that the CSI of a single TRP can be used for selection), the operation is performed by independently changing the RI / PMI, etc. in the resources of each RSS (and / or when the operation is performed by independently changing the RI / PMI, etc. in each resource in each RSS for a specific RSS combination selected based on the selected CRI combination).

[0623] A3-2: When specific CRI combinations for different RSSs are calculated (e.g., combinations with a one-to-one correspondence, first-first, second-second, ...), but after a specific CRI combination for all RSSs is selected (e.g., assuming that the CSI of a single TRP can be used for selection), the operation is performed by independently changing the RI / PMI, etc. in the resources of each RSS (and / or when (e.g., by a single TRP CSI) the operation is performed by independently changing the RI / PMI in each resource of each RSS for a specific RSS combination selected based on the selected CRI combination (the CRI combination is restricted based on a specific rule).

[0624] B1: When considering the assumption about the transmission of a single TRP

[0625] B2: When the assumption about the transmission of a single TRP is not considered

[0626] In this proposal, for convenience of description, each case (e.g., A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2) is classified, but the number of specific CPUs may be applied without limiting the case.

[0627] In addition to the proposals, and / or in addition to existing CPU definitions, and / or the following proposals may be considered unilaterally.

[0628] -When calculating the CSI of M-TRP at the same time, the CPU usage is assumed to be M-CPU. "M-CPU" can represent the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 methods.

[0629] When the sum of ranks is equal to or greater than a certain value (e.g., 4), the CPU occupancy is assumed to be 2. This may mean that it is defined as double the value compared to the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 methods and / or defined as double the value compared to the existing CPU definition. (This may also apply to the following proposals.)

[0630] -When the size of the bandwidth (BW) or subband (SB) configured for CSI reporting is equal to or greater than a specific number, the CPU occupancy is assumed to be 2. This may mean that it is defined as a double value compared to the above-proposed A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 methods and / or it is defined as a double value compared to the existing CPU definition.

[0631] - In the BM report, the CPU occupancy is assumed to be the number of TRPs. "BM report" may indicate a case where the reportQuantity of CSI-ReportConfig is configured to include values ​​of cri-RSRP / ssb-Index-RSRP / cri-SINR / ssb-Index-SINR, etc. The "number of TRPs" may correspond to the number of resource sets in the resource setting. Alternatively, each TRP may be classified according to information about a CORESET group (or CORESET pool) (e.g., index, identifier (ID)), and the "number of TRPs" may correspond to the number of CORESET groups (pools) / the number of CORESET group IDs / the number of CORESET pool indexes.

[0632] When the number of CRI candidate values ​​is greater than the number of resources used for CM in N CPU calculations, the terminal may recognize it as a CSI report for mTRP (ie, multiple TRP) CSI feedback.

[0633] When the number of CRI candidate values ​​is greater than the number of resources used for CM in NCPU calculation, the terminal may recognize it as a CSI report for mTRP (ie, multi-TRP) CSI feedback.

[0634] TS38.214 defines a priority rule for CSI reporting to determine which CSI to feed back when channels / resources for CSI feedback overlap / collide. Table 24 below illustrates a portion of the description regarding the priority rule defined in the standard.

[0635] [Table 24]

[0636]

[0637]

[0638] In addition to this definition, when CSI that considers multi-TRP transmission is introduced, it can include more information compared to the existing CSI definition, so new priority rules can be defined by reflecting this. The following shows a proposal for a newly defined priority rule and an example of applying the proposal based on the priority rule defined in the current standard.

[0639] "CSI considering multiple TRP transmissions" may be referred to as MTRP CSI and may be configured to the terminal via the reportQuantity of CSI-ReportConfig. In addition, "CSI considering multiple TRP transmissions" may be defined as including values ​​of (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc. And / or, "CSI considering multiple TRP transmissions" may represent / include a case where beam / RS pair information is configured. And / or, "CSI considering multiple TRP transmissions" may represent / include a case where multiple resource sets are configured (for CM) in the resource setting. And / or, "CSI considering multiple TRP transmissions" may represent / include a case where multiple CSI sets are configured to be reported. The CSI opposite to MTRP CSI may be referred to as STRP CSI (i.e., single TRP CSI), which may represent the previously defined CSI.

[0640] A1.MTRP CSI can be defined as a higher priority than STRP CSI. A higher priority may mean that it can be sent first when the channels / resources used for CSI feedback overlap / conflict. In addition, the CSI used for BM (beam management) (e.g., for L1-RSRP / L1-SINR) can be defined as the highest priority, regardless of MTRP CSI / STRP CSI. For example, the priority can be defined in the order of CSI for BM (for MTRP / STRP CSI)>MTRP CSI (for non-BM)>STRP CSI (for non-BM). The reason why the CSI for BM is defined as the highest priority is that when the BM between the base station and the terminal fails, communication may be impossible due to deterioration of signal quality. Therefore, BM can be performed smoothly by defining the CSI for BM as the highest priority. At the same time, the reason why MTRP CSI should be defined as a higher priority than STRP CSI is as follows. The base station should send the CSI-RS corresponding to different TRPs to the terminal to calculate the MTRP CSI. In addition, the terminal should calculate (joint) CSI by using the corresponding RS, so it may require more complexity / battery than STRP CSI. Therefore, since CSI is generated based on the terminal's large resources and complexity, it may be desirable to send it first. In addition, since the channel information corresponding to different TRPs can be considered to be included in the joint CSI itself, the effect of reporting STRP CSI corresponding to each TRP can be achieved by reporting MTRP CSI to the base station.

[0641] Table 25 below shows an example of how this proposal is applied to the current standard. iCSI(y, k, c, s) can be expressed as follows, and for k = 1 (e.g., MTRP CSI (for non-BM)) and for k = 2 (e.g., STRP CSI (for non-BM)), that is, based on the priority of MTRP CSI / STRP CSI, the value of k can be configured. For example, the priority of each CSI can be inversely proportional to the value of k. In other words, as the priority is higher, the value of k associated with (for) CSI can be smaller.

[0642] [Table 25]

[0643]

[0644]

[0645] A2. For MTRP CSI and STRP CSI, CSI for BM can be defined separately. And, CSI for BM can be defined as a higher priority compared to CSI for non-BM, and MTRP CSI can be defined as a higher priority compared to STRP CSI. In this case, the priorities can be defined in the following order: MTRP CSI for BM > STRP CSI for BM > MTRP CSI for non-BM > STRP CSI for non-BM. The reasons and effects are the same as described in A1. Since CSI for BM is classified into MTRP CSI and STRP CSI, giving MTRP CSI a higher priority may have advantages. Table 26 below shows an example of applying this proposal to the current standard. Specifically, PriiCSI(y, k, c, s) can be expressed as follows, and for k = 0 (e.g., MTRP CSI for BM), for k = 1 (e.g., STRP CSI for BM), for k = 2 (e.g., MTRP CSI for non-BM), for k = 3 (e.g., STRP CSI for non-BM), it can be described as follows. In other words, the value of k can be configured based on priority, and the priority is determined based on whether it is MTRP / STRP and the content of the CSI (e.g., CSI for BM or other CSI). For example, the priority of each CSI can be inversely proportional to the value of k. In other words, when the priority is higher, the k value associated with (for) CSI can be smaller.

[0646] Table 26 shows an example of applying the proposal of the present disclosure based on the priority rules defined in the current standard.

[0647] [Table 26]

[0648]

[0649]

[0650] Meanwhile, the example in Table 25 or Table 26 corresponds to an example of the ETGF application proposal and is not limited to the only example of the application proposal. Therefore, other examples that can be applied to the standard based on the proposal are possible. For example, priority can be determined based on whether it is MTRP CSI or STRP CSI / CSI / CSI content (e.g., CRI / RI / PMI / CQI / LI / RSRP / SINR) / the number of MTRPs associated with CSI, etc.

[0651] Meanwhile, it is assumed that MTRP CSI has a higher priority than STRP CSI with respect to the proposed priority rule, but the technical scope of the present disclosure is not limited thereto. STRP CSI may also be defined as having a higher priority than MTRP CSI. Since STRP CSI may have a more accurate value than MTRP CSI in terms of a single TRP, there may be an environment where STRP CSI is preferred. Therefore, for this case, STRP CSI may be defined as having a higher priority than MTRP CSI. In this case, for example, the example of priority regarding the above-mentioned A1 may be defined in the order of CSI for BM (for MTRP / STRP CSI) > STRP CSI (for non-BM) > MTRP CSI (for non-BM). For example, the example of priority regarding the above-mentioned A2 may be defined in the following order: STRP CSI for BM > MTRP CSI for BM > STRPCSI for non-BM > MTRP CSI for non-BM.

[0652] For example, the above-mentioned priority rules may be predefined between the base station (or TRP) and the terminal, or the base station (or TRP) may indicate the configuration related to the above-mentioned priority rules to the terminal.

[0653] When describing the proposal, CSI sets are defined and explicitly categorized for ease of description. However, when reporting CSI, each CSI set may not be explicitly categorized. Operations such as reporting report values ​​for different CSI sets (or reporting values ​​that have a mutual mapping relationship and are defined as a pair (e.g., RI1-PMI1-..., RI2-PMI2-..., etc.)) may be defined so that they are reported together according to one reporting setting.

[0654] The embodiments described in the above-mentioned Proposal 1, Proposal 2, etc. may be applied independently or may be applied together as a combination of a plurality of embodiments.

[0655] The proposals and embodiments described in Proposal 1, Proposal 2, etc. assume that different TRPs can be classified in resource units or in resource set units. At the same time, TRPs can also be classified in resource setting units. In this case, by extending the proposal in the resource setting unit, the proposal defined in the resource group unit in a single resource set can be applied, and the single resource set can represent the TRP unit in Proposal 1. In addition, by extending the proposal in the resource setting unit, the proposal defined in the resource group unit in a single resource set can be applied, and the single resource set can represent the TRP unit in Proposal 2.

[0656] Hereinafter, the SINR calculation method considering multi-TRP transmission is described.

[0657] based on Figure 8 For example, when considering multi-TRP transmission, the received signal of the terminal is the same as the received signal in the above formula 3.

[0658] For the terminal’s received signal, H 1 Nrx×N1,tx ,H 2 Nrx×N2,tx ,H 1,intf Nrx×N1,intf ,H 2,intf Nrx×N2,intf The terminal's estimated value can be generated using the NZP CSI-RS for CM from TRP 1, the NZP CSI-RS for CM from TRP 2, the NZP CSI-RS for IM from TRP 1, the NZP CSI-RS for IM from TRP 2, and the CSI-IM for IM. The estimated value for each channel can be defined as shown in Equation 18 below.

[0659] [Equation 18]

[0660]

[0661] The SINR considering multi-TRP transmission (e.g., for NCJT) can be defined based on the estimated value of the channel and the two PMIs selected by the terminal, as in the following equation 19. In equation 19, the trace (trace) can represent the sum of the diagonal elements of the matrix, and the sum (sum) can represent the sum of the magnitudes of all elements of the matrix.

[0662] [Equation 19]

[0663]

[0664]

[0665]

[0666]

[0667]

[0668]

[0669]

[0670]

[0671]

[0672]

[0673]

[0674]

[0675]

[0676]

[0677] N: noise variance

[0678] In the following, proposals related to improvements in multi-TRP beam reporting are described.

[0679] In the method proposed in the present disclosure, DL MTRP-URLLC means that multiple TRPs send the same data / DCI by using different layer / time / frequency resources. For example, TRP 1 sends the same data / DCI in resource 1, and TRP 2 sends the same data / DCI in resource 2. A UE configured with the DL MTRP-URLLC transmission method receives the same data / DCI by using different layer / time / frequency resources. Here, it is indicated which QCL RS / type (i.e., DL TCI (state)) the UE should use in the layer / time / frequency resources for receiving the same data / DCI from the base station. For example, when the same data / DCI is received in resource 1 and resource 2, the DL TCI state used in resource 1 and the DL TCI state used in resource 2 can be indicated. The UE can achieve high reliability because it receives the same data / DCI through resource 1 and resource 2. This DL MTRP URLLC can be applied to PDSCH / PDCCH.

[0680] In contrast, UL MTRP-URLLC means that multiple TRPs receive the same data / UCI from the UE by using different layer / time / frequency resources. For example, TRP 1 receives the same data / DCI from the UE in resource 1, and TRP 2 receives the same data / DCI from the UE in resource 2, and the received data / DCI is shared through the backhaul link connected between the TRPs. A UE configured with the UL MTRP-URLLC transmission method sends the same data / UCI by using different layer / time / frequency resources. Here, the UE is instructed from the base station which Tx beam and which Tx power (i.e., UL TCI state) should be used in the layer / time / frequency resources for sending the same data / DCI. For example, when the same data / UCI is received in resource 1 and resource 2, the UL TCI state used in resource 1 and the UL TCI state used in resource 2 can be indicated. This UL MTRP URLLC can be applied to PUSCH / PUCCH.

[0681] In addition, in the method proposed in the present disclosure, when a specific TCI state (or TCI) is used (or mapped) when receiving data / DCI / UCI for any frequency / time / space resource, it may mean that the DL estimates the channel from the DMRS by using the QCL type and QCL RS indicated by the corresponding TCI state in the frequency / time / space resource, and receives / demodulates the data / DCI to the estimated channel. This may mean that the UL transmits / modulates the DMRS and data / UCI by using the Tx beam and / or Tx power indicated by the corresponding TCI state in the frequency / time / space resource.

[0682] The UL TCI state has the Tx beam and / or Tx power information of the UE, and spatial relationship information, etc., instead of the TCI state, which can be configured to the UE through other parameters. The UL TCI state can be directly indicated to the UL grant DCI, or can represent the spatial relationship information of the SRS resource indicated by the SRI (SRS resource indicator) field of the UL grant DCI. Alternatively, the OL (open loop) Tx power control parameter (j: index for open loop parameters Po and α (up to 32 parameter value sets per cell), q_d: index of DL RS resource for PL (path loss) measurement (up to 4 measurements per cell), l: closed loop power control process index (up to 2 processes per cell)) connected to the value indicated by the SRI field of the UL grant DCI can be represented.

[0683] On the other hand, assuming that MTRP-eMBB indicates that multiple TRPs transmit other data by using different layers / times / frequencies, a UE configured with the MTRP-eMBB transmission method is indicated with multiple TCI states using DCI, and the data received by using the QCL RS of each TCI state is different data.

[0684] In addition, the UE can understand whether it is MTRP URLLC transmission / reception or MTRP eMBB transmission / reception by classifying the RNTI for MTRP-URLLC and the RNTI for MTRP-eMBB respectively and using them. In other words, when the CRC masking of the DCI is performed by using the RNTI for URLLC, it is considered to be URLLC transmission, and when the CRC masking of the DCI is performed by using the RNTI for eMBB, it is considered to be eMBB transmission. Alternatively, the base station can configure MTRPURLLC transmission / reception, or MTRP eMBB transmission / reception can be configured to the UE through other new signaling.

[0685] In this disclosure, for ease of description, the proposed method assumes cooperative transmission / reception between two TRPs. However, it can be extended and applied to three or more multi-TRP environments and also to multi-panel environments. The UE can identify different TRPs as different TCI states, and when the UE receives / transmits data / DCI / UCI using TCI state 1, it indicates that data / DCI / UCI is received from / transmitted to TRP 1.

[0686] The proposals of the present disclosure may be utilized in the case where MTRP cooperatively transmits PDCCH (repeatedly or partially transmits the same PDCCH), and some proposals may be utilized even in the case where MTRP cooperatively transmits PDSCH or cooperatively receives PUSCH / PUCCH.

[0687] In addition, in the present disclosure, when multiple base stations (i.e., MTRP) repeatedly transmit the same PDCCH, this may indicate that the same DCI is transmitted by multiple PDCCH candidates, and may indicate that multiple base stations repeatedly transmit the same DCI. The same DCI may represent two DCIs with the same DCI format / size / payload. Alternatively, although the two DCIs have different payloads, they may be considered to be the same DCI when the scheduling results are the same. For example, the TDRA (time domain resource allocation) field of the DCI relatively determines the time slot / symbol position of the data and the time slot / symbol position of A / N (ACK / NACK) based on the reception time of the DCI, and if the DCI received at time n and the DCI received at time n+1 represent the same scheduling result for the UE, the TDRA fields of the two DCIs are different, and therefore, the DCI payloads are different. The number of repetitions R may be directly indicated by the base station or mutually agreed to the UE. Alternatively, although the payloads of the two DCIs are different and the scheduling results are different, when the scheduling result of one DCI is a subset of the scheduling result of the other DCI, it may be considered to be the same DCI. For example, when the same data is repeatedly transmitted N times via TDM, DCI 1 received before the first data indicates N data repetitions, and DCI 2 received after the first data and before the second data indicates N-1 data repetitions. The scheduled data of DCI 2 becomes a subset of the scheduled data of DCI 1, and since both DCIs schedule the same data, they can be considered to be the same DCI in this case.

[0688] In addition, in the present disclosure, when multiple base stations (ie, MTRPs) partially transmit the same PDCCH, it means that one DCI is transmitted by one PDCCH candidate, and some resources defining the PDCCH candidate are transmitted by TRP 1 and the remaining resources are transmitted by TRP2.

[0689] In addition, in the present disclosure, when the UE repeatedly transmits the same PUSCH so that multiple base stations (i.e., MTRPs) can receive it, it means that the same data is transmitted through multiple PUSCHs, and each PUSCH can be optimized for the UL channel of a different TRP and transmitted. For example, the UE repeatedly transmits the same data through PUSCH 1 and 2, and PUSCH 1 performs transmission by using the UL TCI state 1 for TRP 1, and link adaptation such as precoder / MCS also performs transmission by the channel-optimized scheduling value for TRP 1. PUSCH 2 performs transmission by using the UL TCI state 2 for TRP 2, and link adaptation such as precoder / MCS also performs transmission by the channel-optimized scheduling value for TRP 2. In this case, the repeatedly transmitted PUSCHs 1 and 2 can be transmitted at different times to perform time division multiplexing (TDM), frequency division multiplexing (FDM), and space division multiplexing (SDM).

[0690] In addition, in the present disclosure, when a UE partially transmits the same PUSCH so that multiple base stations (i.e., MTRPs) will receive it, it means that one data is transmitted by one PUSCH, but the resources allocated to the PUSCH can be divided to optimize and transmit it to the UL channels of different TRPs. For example, the UE transmits the same data through a 10-symbol PUSCH, transmits the first 5 symbols by using the UL TCI state 1 of TRP 1, and also transmits link adaptation such as precoder / MCS by scheduling values ​​optimized for the channel of TRP 1. The remaining 5 symbols are transmitted by using the UL TCI state 2 for TRP 2, and also transmits link adaptation such as precoder / MCS by scheduling values ​​optimized for the channel of TRP 2. In this example, the transmission of TRP 1 and the transmission of TRP 2 are time-division multiplexed (TDM) by dividing one PUSCH into time resources, but it can be transmitted by other FDM / SDM methods.

[0691] Similar to PUSCH transmission, the UE may repeatedly transmit or partially transmit the same PUCCH so that multiple base stations (ie, MTRPs) may receive the PUCCH.

[0692] The proposal of the present disclosure can be extended and applied to various channels, such as PUSCH / PUCCH / PDSCH / PDCCH, etc.

[0693] The UE may have two Rx panels that can simultaneously receive two beams for MTRP PDSCH. For example, the UE receives data 1 transmitted from TRP 1 using panel / beam 1, and simultaneously receives data 2 transmitted from TRP 2 using panel / beam 2. Here, data 1 can only be effectively received when the beam of TRP 1 received by panel 1 has high reception strength and the beam of TRP 2 has low reception strength, and data 2 can only be effectively received when the beam of TRP 2 received by panel 2 has high reception strength and the beam of TRP 1 has low reception strength.

[0694] The UE reports reception strength information about the candidate beams of TRP 1 and the candidate beams of TRP 2 to the base station (which is called a beam report), and the base station performs MTRP PDSCH transmission by selecting the beam of TRP 1 and the beam of TRP 2 based on this. For example, when the beam candidates that can transmit TRP 1 (i.e., the transmission BM (beam management)-RS of TRP 1) are NZP CSIRS 1, 2 (respectively, 1 port) and the beam candidates that can transmit TRP 2 (i.e., the transmission BM (beam management)-RS of TRP 2) are NZP CSIRS 3, 4 (respectively, 1 port), the base station can determine which combination of the two beam candidates corresponding to NZP CSIRS 1, 2 of TRP 1 and the two beam candidates corresponding to NZP CSIRS 3, 4 of TRP 2 will be valid for MTRP PDSCH transmission. To this end, the UE can use NZP CSIRS 1, 2, 3, and 4 to perform L1-SINR beam reporting.

[0695] The UE can perform beam reporting as follows so that the base station can effectively configure the beam of TRP 1 and the beam of TRP 2.

[0696] The L1 SINR beam report configured for the UE can be configured as follows. All (CMR (Channel Measurement Resource), IMR (Interference Measurement Resource)) pairing combinations for beam candidates (e.g., BM (Beam Management) RS, NZP CSIRS) can be configured. For ease of description, it is assumed that NZP CSIRS 1 / 2 / 3 / 4 are beam candidates for MTRP transmission. However, such an assumption does not limit the technical scope of the present disclosure.

[0697] (CMR,IMR)={(NZP CSIRS 1,NZP CSIRS 3),(NZP CSIRS 1,NZP CSIRS 4),(NZPCSIRS 2,NZP CSIRS 3),(NZP CSIRS 2,NZP CSIRS 4),(NZP CSIRS 3,NZP CSIRS 1),(NZPCSIRS 3,NZP CSIRS 2),(NZP CSIRS 4,NZP CSIRS 1),(NZP CSIRS 4,NZP CSIRS 2)}

[0698] The UE is configured to report the L1 SINR of 8 (CMR, IMR) pairs, and the UE reports the 8 L1 SINR values ​​corresponding to each CMR, IMR pair. The base station whose L1 SINR value is reported uses argmax ij (L1-SINR ij +L1-SINR ji ) Find the pair i and j. Here, L1-SINR ij =(CMR,IMR)=(NZP CSIRS i, NZP CSIRS j). Alternatively, argmax can be used. ij (tput(L1-SINR ij )+tput(L1-SINR ji )) find i and j. tput(L1-SINR) represents the transmittable throughput for L1-SINR and, for example, may be represented by log(1+L1-SINR). Alternatively, i and j may be found by a simple summation of L1-SINR or tput in the formula, but in addition, a value that makes L1-SINR ij and L1-SINR ji In addition, we can find the i and j that maximize the minimum value of tput(L1-SINR ij ) and tput(L1-SINR ji ) is the i and j that maximize the minimum value of ). This method has the disadvantage of large beam reporting overhead.

[0699] Hereinafter, for the sake of convenience, it is assumed that NZP CSIRS 1 / 2 / 3 / 4 are beam candidates (eg, BM-RS, NZP CSIRS) for MTRP transmission. However, such an assumption does not limit the technical scope of the present disclosure.

[0700] <Method 1>

[0701] The L1 SINR beam report configured for the UE can be configured as follows. A (CMR, IMR) pair can be configured by configuring the NZP CSIRS for a specific TRP as a CMR and configuring the NZP CSIRS for other TRPs as an IMR (e.g., BM-RS, NZP CSIRS) in the beam candidate. The following example is an example in which the NZP CSIRS for TRP 1 (e.g., NZP CSIRS 1 / 2) is configured as a CMR and the NZP CSIRS for TRP2 (e.g., NZP CSIRS 3 / 4) is configured as an IMR.

[0702] (CMR,IMR)={(NZP CSIRS 1,NZP CSIRS 3),(NZP CSIRS 1,NZP CSIRS 4),(NZPCSIRS 2,NZP CSIRS 3),(NZP CSIRS 2,NZP CSIRS 4)}

[0703] The UE can calculate the L1-SINR by applying the receive beam (i.e., QCL type D) of NZP CSIRS i (i.e., CMR) to the CMR and IMR of (NZP CSIRS i, NZP CSIRS j) ij Furthermore, the L1-SINR is found by applying the receive beam / panel (i.e., QCL type D) of NZP CSIRS j (i.e., IMR) to CMR and IMR ij '. Therefore, L1-SINR ij ' represents the SINR value when receiving data from TRP 1 by using the reception beam / panel used when receiving data from TRP 2. In other words, it represents the SINR value when L1-SINR ij ' is smaller, the received SINR is larger when receiving data from TRP 2, and when L1-SINR ij When the value of ' is larger, the received SINR is larger when receiving data from TRP 1.

[0704] The UE reports the best N L1-SINRs as before (the best N L1-SINRs represent the N L1-SINRs with the maximum values, and the corresponding i, j pairs are reported to the CRI, and the L1-SINR values ​​are reported). In addition, the UE reports the worst N L1-SINR's (i.e., the N L1-SINR's with the minimum values). Best N L1-SINR ijIndicates the best beam pair i, j in order when receiving data of TP 1 using the Rx beam in the direction of TP 1, and worst NL1-SINR_ij' indicates the worst beam pair i, j in order when receiving data of TP 1 using the Rx beam in the direction of TP 2. Alternatively, it is possible to indicate only the worst NL1-SINR ij 'The corresponding i,j pair does not report L1-SINR ij ' value to save UL resources.

[0705] (L1-SINR ij ')-1 and L1-SINR ji Therefore, the best N(L1-SINR) can be reported ij ')-1 instead of the worst N L1-SINR ij '. In this case, (L1-SINR ij ')-1 has the advantage that the quantization table for reporting the existing L1-SINR value can be used as is. Alternatively, the L1-SINR may be reported ij and (L1-SINR')-1 instead of the difference between (L1-SINR ij ')-1 value.

[0706] Alternatively, the best N L1-SINR can be reported ij , and the L1-SINR corresponding to this ij can be reported together ij ' and L1-SINR ij '-1 value.

[0707] Alternatively, the UE finds a node with a large L1-SINR ij +(L1-SINR ij ')-1, and report the corresponding L1-SINR ij or (L1-SINR ij ')-1 or the sum of the two. Alternatively, the UE finds a node with large tput(L1-SINR ij )+tput((L1-SINR ij ')-1) and report the corresponding L1-SINR ij or (L1-SINR ij Alternatively, i and j can be found by simple summation of L1-SINR or tput in the formula, but in addition, it is possible to find L1-SINRij and (L1-SINR ij The i and j that maximize the minimum value of ')-1 can be found and reported.ij ) and tput((L1-SINR ij ')-1) is the i and j that maximize the minimum value, and the corresponding L1-SINR can be reported ij or (L1-SINR ij ')-1 or the sum of both.

[0708] <Method 2>

[0709] The L1 SINR beam report configured for the UE can be configured as follows. A (CMR, IMR) pair can be configured by configuring the NZP CSIRS for a specific TRP as a CMR and configuring the NZP CSIRS for other TRPs as an IMR (e.g., BM-RS, NZP CSIRS) in the beam candidate. The following example is an example in which the NZP CSIRS for TRP 1 (e.g., NZP CSIRS 1 / 2) is configured as a CMR and the NZP CSIRS for TRP2 (e.g., NZP CSIRS 3 / 4) is configured as an IMR.

[0710] (CMR,IMR)={(NZP CSIRS 1,NZP CSIRS 3),(NZP CSIRS 1,NZP CSIRS 4),(NZPCSIRS 2,NZP CSIRS 3),(NZP CSIRS 2,NZP CSIRS 4)}

[0711] UE calculates L1-SINR for (NZP CSIRS i, NZP CSIRS j) ij , and additionally calculate and report L1-ISNR ij L1-ISNR ij = represents the interference to signal-plus-noise power ratio obtained by measuring the received powers of CMR and IMR of the receive beam / panel (i.e., QCL type D) of NZP CSIRS j (i.e., IMR), configuring the measured power of IMR as the numerator and the measured power of CMR as the denominator. Therefore, L1-ISNR ij L1-SINR ji .

[0712] The UE reports the best N L1-SINR as before (the best N L1-SINR represents the N L1-SINRs with the maximum value, and the corresponding i and j pairs are reported to the CRI, and the L1-SINR value is reported). In addition, the best N L1-ISNR is reported. ijIndicates the best beam pair i and j in order when receiving data of TP 1 using the Rx beam in the direction of TP1, and the best N L1-ISNR ij Indicates the best beam pair i and j in order when receiving data of TP 2 using the Rx beam in the direction of TP 2. Alternatively, it is possible to indicate the best beam pair i and j in order when receiving data of TP 2 using the Rx beam in the direction of TP 2. ij The corresponding i and j pairs do not report L1-ISNR ij Alternatively, L1-SINR can be reported ij and L1-ISNR ij The difference between the two values ​​is not L1-ISNR. ij The value of .

[0713] Alternatively, the best N L1-SINRij may be reported, and the value of L1-ISNRij corresponding to this ij may be reported together.

[0714] Alternatively, the UE finds a node with a large L1-SINR ij +(L1-ISNR ij ) and report the corresponding L1-SINR ij or (L1-ISNR ij ) or the sum of both. Alternatively, the UE finds a node with large tput (L1-SINR ij )+tput((L1-ISNR ij )) and report the corresponding L1-SINR ij or (L1-ISNR ij Alternatively, in the formula, i and j are found by a simple sum of L1-SINR or tput, but in addition, L1-SINR is found and reported. ij and (L1-ISNRv) minimize the value of i and j or put (L1-SINR ij ) and tput((L1-ISNR ij )) and report the corresponding L1-SINR ij or (L1-ISNR ij ) or the sum of both.

[0715] <Method 3>

[0716] The L1 SINR beam reporting configured for the UE may be configured as follows.

[0717] (CMR,IMR)={Group A(NZP CSIRS 1,NZP CSIRS 3),(NZP CSIRS 3,NZP CSIRS1),Group B(NZP CSIRS 1,NZP CSIRS 4),(NZP CSIRS 4,NZP CSIRS 1),Group C(NZP CSIRS 2,NZP CSIRS 3),(NZP CSIRS 3,NZP CSIRS 2),Group D(NZP CSIRS 2,NZP CSIRS4),(NZP CSIRS 4,NZP CSIRS 2)}

[0718] The base station can group CMR and IMR pairs and configure them to the UE. For example, group A can be configured as (NZP CSIRS 1, NZP CSIRS 3), (NZP CSIRS 3, NZP CSIRS 1). The UE uses the CMR and IMR pairs belonging to the same group to calculate the L1-SINR value. For example, for group A, calculate the L1-SINR 13 and L1-SINR 31 . The UE reports the best N(L1-SINR) group based on the SINR value calculated thereby. The base station may directly signal the grouping information, or indirectly agree to switch the resources of CMR and IMR into grouped pairs. For example, as in the above example, group A may directly configure the group information as (NZP CSIRS 1, NZP CSIRS 3), (NZP CSIRS 3, NZP CSIRS 1), or if only the measurement resources of the group are configured (e.g., NZP CSIRS 1, NZP CSIRS 3), it may be agreed / defined as being grouped as a pair by alternating the order of the corresponding measurement resources.

[0719] The method for selecting / reporting the best N groups is as follows.

[0720] First, the L1 SINR values ​​calculated from the first (or last) CMR, IMR pair of each group are compared to select the best N groups with large values.

[0721] Alternatively, the UE compares the sum of the L1 SINR values ​​calculated from the CMR and IMR pairs of each group and selects the best N groups with the largest value. Alternatively, the L1 SINR calculated from the CMR and IMR pairs of each group is replaced by tput to find the sum of the tput values ​​and select the best N groups with the largest value. Alternatively, the minimum value of the L1 SINR or tput values ​​calculated from the CMR and IMR pairs of each group is found to select the best N groups with the largest minimum value.

[0722] The L1-SINR corresponding to the best N groups is reported as the following values.

[0723] The L1 SINR value calculated from the first (or last) CMR, IMR pair of the best N group may be reported.

[0724] Alternatively, all L1 SINR values ​​calculated from the CMR / IMR pairs of the best N groups may be reported. Here, based on the L1 SINR value of a specific CMR / IMR pair among the multiple CMR / IMR pairs of the best N groups, the L1 SINR values ​​of the remaining CMR / IMR pairs may be reported as differential values. For example, based on the L1 SINR calculated from the first CMR / IMR pair of the best N groups, the difference in L1 SINR calculated from the remaining CMR / IMR pairs of the corresponding group may be reported.

[0725] <Method 4>

[0726] The L1 SINR beam report configured for the UE can be configured as follows. A (CMR, IMR) pair can be configured by configuring the NZP CSIRS for a specific TRP as a CMR and configuring the NZP CSIRS for other TRPs as an IMR (e.g., BM-RS, NZP CSIRS) in the beam candidate. The following example is an example in which the NZP CSIRS for TRP 1 (e.g., NZP CSIRS 1 / 2) is configured as a CMR and the NZP CSIRS for TRP 2 (e.g., NZP CSIRS 3 / 4) is configured as an IMR.

[0727] (CMR,IMR)={(NZP CSIRS 1,NZP CSIRS 3),(NZP CSIRS 1,NZP CSIRS 4),(NZPCSIRS 2,NZP CSIRS 3),(NZP CSIRS 2,NZP CSIRS 4)}

[0728] UE calculates L1-SINR for (NZP CSIRS i, NZP CSIRS j) ij , and additionally measures the port power of NZP CSIRS j configured as IMR to calculate and report L1-RSRP. (This is referred to as IMR-based L1-RSRP.) Here, power is measured by applying the receive beam / panel (i.e., QCL type D) of NZP CSIRS j (i.e., IMR).

[0729] The UE reports the best N L1-SINR as before (the best N L1-SINR indicates the N L1-SINRs with the maximum value, and the corresponding i and j pairs are reported to the CRI, and the value of the L1-SINR is reported), and additionally reports the L1-RSRP based on the best N IMR. Alternatively, the L1-ISNR may be reported without indicating only the i and j pairs corresponding to the L1-RSRP based on the best N IMR. ij value to save UL resources.

[0730] Alternatively, the best NL1-ISNR can be reported ij , and the value of L1-RSRP based on IMR corresponding to the ij can be reported together.

[0731] Alternatively, find the L1-SINR ij and / or L1-RSRP based on IMR ij The i and j that maximize the minimum value of the report are used to report the corresponding L1-RSRP ij or (L1-RSRP based on IMR ij ). Alternatively, calculate the best N L1-SINR ij , and only when with the best NL1-SINR ij The best N L1-SINR is reported only when the value of L1-RSRP based on IMR corresponding to ij is equal to or greater than a specific threshold. ij .

[0732] In the above methods (Proposals 1 / 2 / 3 / 4, etc.), for ease of description, the CSI / beam calculation / reporting is described based on TRP 2. However, similarly, the CSI / beam of TRP 1 can also be calculated / reported using inverse CQI. In addition, for ease of description, the operation is described based on two TRPs (for example, TRP 1 / TRP 2), but of course, it can be extended to multiple TRP operations.

[0733] In the present disclosure, description is made based on "TRP", but as described above, "TRP" can be applied by replacing it with expressions such as panel, cell, transmission point (TP), base station (gNB, etc.), etc. In addition, as described above, TRP can be classified according to information (e.g., index) about the CORESET group (or CORESET pool). In an example, when one terminal is configured to perform transmission and reception with multiple TRPs (or cells), it can be expressed that multiple CORESET groups (or CORESET pools) are configured for one terminal. Such configuration for the CORESET group (or CORESET pool) can be performed through higher layer signaling (e.g., RRC signaling, etc.). In addition, when multiple CORESET groups are configured for one terminal, the corresponding terminal can be configured or defined to receive data by using M-TRP operation based on multi-DCI.

[0734] Proposal 3: Define / Configure for Multiple TRPs Method for calculating CSI time of CSI feedback and CSI report

[0735] The following Table 27 shows the definition of CSI calculation time defined in the current standard TS38.214.

[0736] [Table 27]

[0737]

[0738]

[0739] Table 28 illustrates CSI calculation delay request 1.

[0740] [Table 28]

[0741]

[0742] Table 29 illustrates CSI calculation delay request 2.

[0743] [Table 29]

[0744]

[0745] In Table 27, the CSI calculation time assumes CSI feedback for a single TRP. However, for mTRP CSI feedback, terminal complexity may increase due to increased assumptions, etc. Therefore, for mTRP CSI feedback, the values ​​of Z and Z' can be defined separately to account for the increased terminal complexity. The method is described below.

[0746] Proposal 3-1: For CSI reporting of mTRP CSI feedback, the CSI calculation time may be defined as follows by considering the additional time required by the terminal based on the value of a specific parameter (eg, Z2) related to the CSI calculation time defined in the current standard.

[0747] For the values ​​used as the standard in Proposal 3-1, other values ​​other than the value of Z2 defined in the current standard may also be used. In other words, any value defined in the current standard may become the standard value.

[0748] Table 30 illustrates the CSI calculation time for mTRP CSI feedback according to the method proposed in this disclosure.

[0749] [Table 30]

[0750]

[0751] In Table 30, X1, X2, X3, X4 and X'1, X'2, X'3, X'4 are integers equal to or greater than 0 and may be defined by a fixed rule or may be configured / indicated to the terminal based on the L1 / L2 signaling of the base station and / or the reported value of the terminal (e.g., UE capabilities, etc.).

[0752] As an example of a fixed rule, all values ​​of X1, X2, X3, X4 and X'1, X'2, X'3, X'4 may be defined as 0. In this case, multi-TRP CSI feedback may achieve the effect of applying the maximum value of the CSI calculation time defined in the current standard.

[0753] Furthermore, (partial or complete) values ​​of X1, X2, X3, X4 and X'1, X'2, X'3, X'4 may be defined as the same or different values. For example, X1=X'1, X2=X'2, X3=X'3, X4=X'4 (here, X1≠X2≠X3≠X4).

[0754] When this proposal is applied, there is an effect of allowing the terminal to process CSI calculation with high complexity by defining the minimum value as a value equal to or greater than the currently defined maximum value.

[0755] Proposal 3-1: Even when condition n is satisfied, for CSI reporting of multi-TRP CSI feedback, a CSI calculation time (eg, Z2, Z'2) that is larger than the values ​​Z, Z' corresponding to condition n may be defined / configured.

[0756] In the above, condition 1 (i.e., 1 is included in n) may indicate that the conditions corresponding to Z1 and Z'1 defined in Table 28 are satisfied. For example, based on such a proposal, even when condition 1 is satisfied, for CSI reporting of multi-TRP CSI feedback, values ​​greater than Z1 and Z'1 in Table 28 (e.g., Z2 and Z'2) may be defined.

[0757] In the above, condition 2 may indicate that the conditions corresponding to Z1 and Z'1 defined in Table 29 are satisfied. For example, even when condition 2 is satisfied based on such a proposal, for CSI reporting of multi-TRP CSI feedback, values ​​greater than Z1 and Z'1 defined in Table 29 (e.g., Z2 and Z'2) may be defined.

[0758] In the above, condition 3 may indicate that the conditions corresponding to Z3, Z'3 defined in Table 29 are satisfied. For example, even when condition 3 is satisfied based on such a proposal, for CSI reporting of multi-TRP CSI feedback, it may be defined as a value greater than Z3, Z'3 defined in Table 29 (e.g., Z2, Z'2).

[0759] As a proposed embodiment, the condition “not corresponding to a CSI report for multi-TRP (mTRP) CSI feedback” may be additionally included in condition 1 and / or condition 2 and / or condition 3.

[0760] Here, “CSI report for mTRP CSI feedback” may mean at least any one of the following.

[0761] When the reported quantities include quantities used for mTRP CSI feedback; and / or

[0762] Configure multiple CSI-RS resources (for channel measurement) (and associated IMRs),

[0763] 2-1. When multiple CRI, CQI and / or RI reports are configured, and / or

[0764] 2-2. When multiple PMI reports (corresponding to different CSI-RS resources) for the same frequency band (eg, subband, wideband) are configured, and / or

[0765] 2-3. When joint CQI reporting (calculated by considering channels estimated for multiple CSI-RS resources) for the same frequency band (e.g., subband, wideband) is configured, and / or

[0766] When configured to report CRIs equal to or greater than the number of CSI-RS resources (used for channel measurement) (e.g., LTE CoMP CSI: CMR = {CSIRS1, CSIRS2}, CRI = {0, 1, 2}, for CRIs = 0, joint CQI reporting); and / or

[0767] When calculation dependency between a (CMR, IMR) pair configured for one CSI (CSI1) calculation and a (CMR, IMR) pair configured for another CSI (CSI2) calculation is configured (e.g., when CSI is calculated with the CMR of CSI1 used as the IMR of CSI2 and the CMR of CSI2 used as the IMR of CSI1); and / or

[0768] For a terminal that reports / is instructed / configured / performs the proposed operation related to mTRP beam reporting improvement, it can be considered as a terminal that reports L1-RSRP / L1-SINR based on mTRP. Therefore, when the terminal is configured / instructed to perform the proposed operation related to mTRP beam reporting improvement, the terminal can recognize it as a condition for performing the proposal corresponding to condition 2 and / or condition 3 (e.g., applying a larger CSI calculation time); and / or

[0769] For CSI reporting / being instructed / configured / performing a terminal that performs operations corresponding to Proposal 1 / Proposal 2 of the present disclosure (which may also include operations extended in a resource setting unit).

[0770] Examples 1 to 6 regarding CSI reporting for the above-described mTRPCSI feedback may be applied independently or may be applied by combining two or more examples.

[0771] Examples 1 to 6 of CSI reporting regarding mTRP CSI feedback may be used as operation / A conditions of the terminal, to distinguish from CSI reporting based on single TRP CSI feedback defined in a previous version of the present disclosure.

[0772] Proposal 4: Method for defining CSI reference resources for CSI reporting for multi-TRP (mTRP) CSI feedback

[0773] The following Table 31 shows the definition of CSI reference resources defined in the current standard TS38.214.

[0774] [Table 31]

[0775]

[0776]

[0777] For periodic (P) / semi-persistent (SP) CSI reporting, in the case of mTRP CSI feedback, n can be defined separately by considering the increase in terminal complexity. CSI_ref Proposal 4-1: When P / SP CSI reporting is configured as multi-TRP (mTRP) CSI feedback, n for CSI reference resource definition may be defined as follows CSI_ref The value of n CSI_ref The value of the time slot nnCSI_ref X·2 corresponding to the valid downlink time slot μ DL Same as or greater than X·2 μ DL The minimum value of .

[0778] Hereinafter, examples regarding X are described.

[0779] 1. Option 1: X = 5 + α

[0780] Here, the value of α corresponds to an integer equal to or greater than 0 and may be defined by a fixed rule (e.g., α=1), or may be configured / indicated to the terminal based on the L1 / L2 signaling of the base station and / or the reported value of the terminal (e.g., UE capabilities, etc.). For example, when the P / SP CSI report is configured as mTRP CSI feedback (for multiple CSI-RS / SSB resources), X may be defined as 6.

[0781] Alternatively, the value of X itself may be defined by a fixed rule (eg, X=6). Alternatively, the value of X may be configured / indicated to the terminal based on L1 / L2 signaling of the base station and / or reported values ​​of the terminal (eg, UE capabilities, etc.).

[0782] Since the value of X is defined as a minimum value that is equal to or greater than a currently defined maximum value, it is possible to allow the terminal to process CSI calculation with high complexity.

[0783] Option 2: When a single CSI-RS / SSB resource is configured for CM to each TRP, X may be defined as 4+α1, and when multiple CSI-RS / SSB resources are configured for CM to each TRP, X may be defined as 5+α2.

[0784] The values ​​of α1 and α2 may correspond to integers equal to or greater than 0 and may be defined by a fixed rule (e.g., α=1), or may be configured / indicated to the terminal based on the base station's L1 / L2 signaling and / or the terminal's reported value (e.g., UE capabilities, etc.).

[0785] The values ​​of α1 and α2 may be defined as the same / different values.

[0786] In this proposal, the expression "to each TRP" can be interpreted as meaning that CSI-RS / SSB resources are defined in a predetermined group shape. For example, one or more CSI-RS / SSB resources can correspond to a predetermined group with the same / similar characteristics / common configuration applied, and the group can be interpreted as representing a specific TRP. For example, each TRP can correspond to each resource group defined in a single resource set in Proposal 1, and each TRP can correspond to each resource set in a single resource setting in Proposal 2.

[0787] Alternatively, the value of X for a single CSI-RS / SSB resource and the value of X for multiple CSI-RS / SSB resources may be defined by fixed rules (e.g., X=6). Alternatively, the terminal may be configured / instructed based on the base station's L1 / L2 signaling and / or the terminal's reported values ​​(e.g., UE capabilities, etc.).

[0788] Likewise, more complex CSI reference resources may be defined based on the number of resources for a CM corresponding to each TRP.

[0789] In the above, “CSI reporting for mTRP CSI feedback” may follow the embodiment described in Proposal 3 above.

[0790] The following Table 32 shows the definition of CSI reference resources defined in the current standard TS38.214.

[0791] [Table 32]

[0792]

[0793] Referring to Table 32 and the description associated with Formula 4, in the definition of CSI reference resources for CQI / RI / PMI calculation, the overhead of PT-RS is not considered in the current standard. This is because only a single-port PT-RS is possible in Rel-15, so it can be assumed that the overhead itself is not large and it does not seriously affect the CSI calculation. On the other hand, 2-port PT-RS is introduced in Rel-16, and each PT-RS port is frequency-division multiplexed with each other for a single terminal, so the overhead generated thereby is relatively large. Therefore, if it is not considered in the CSI calculation, the problem of reduced CSI accuracy may arise. Therefore, a method is proposed in which the PT-RS overhead can be reflected in the CSI calculation when a 2-port PT-RS (or for 2 or more port PT-RS) can be applied.

[0794] Rel-16 includes the same contents as in Table 33 below regarding 2-port PT-RS.

[0795] [Table 33]

[0796]

[0797] Proposal 4-2: When defining CSI reference resources (e.g., CQI / RI / PMI) for CSI calculation of a terminal based on an implicit / explicit method, the base station may configure / instruct to consider the overhead of N (e.g., 2) port PT-RSs. (Example of implicit method)

[0798] 1. When the maximum number of PT-RS ports is configured for the terminal as X (e.g., 2) or greater (e.g., n2 of maxNrofPorts-R16 in PTRS-DownlinkConfig), and / or

[0799] 2. When the CSI report is configured as mTRP CSI feedback, the above “mTRP CSI feedback” may follow the embodiment described in Proposal 3, and / or

[0800] 3. When configured / instructed to report multiple LI values ​​for a single CSI report

[0801] When the conditions are met, the terminal may reflect the overhead of N (eg, 2) port PT-RSs on the CSI reference resources.

[0802] The examples of the implicit method may be applied independently, or two or more examples may be combined and applied.

[0803] -Example of explicit method

[0804] 1. When the terminal is configured / instructed based on L1 / L2 signaling to reflect the overhead of N port PT-RS on the CSI reference resource

[0805] As described above, when performing configuration / instruction, the terminal may reflect the overhead of N (eg, 2) port PT-RSs on the CSI reference resource.

[0806] The implicit method and the explicit method may be applied independently, or may be combined and applied.

[0807] -Conditions that can be considered with implicit methods / explicit methods

[0808] Under this condition, when the time / frequency density of PT-RS is equal to or greater than a specific value (eg, for every N PRBs / every M symbols (eg, N≤2, M≤1)), Proposal 4-2 may be applied. The following method is an example thereof.

[0809] 1. When the bandwidth configured for the CQI report corresponding to the CSI report is included in a specific range, and / or

[0810] 1-1. A specific range can be defined by a fixed rule (e.g., N RB0 ≤N RB <N RB1 ,N RB0 =X,N RB1=Y). Alternatively, the specific range may be configured / indicated to the terminal based on L1 / L2 signaling (eg, based on frequency density in PTRS-DownlinkConfig) and / or a reported value of the terminal (eg, UE capability, etc.).

[0811] 2. When specific CQI conditions are met

[0812] 2-1. As an example of a specific CQI condition, the case where the modulation order is equal to or greater than M (e.g., 64QAM) / CQI index is equal to or greater than n / coding rate is equal to or greater than X / efficiency is equal to or greater than X / SNR ( / SINR) is equal to or greater than a specific value is applicable.

[0813] 3. Motivation and application of the method

[0814] 3-1. The frequency axis pattern / density of PT-RS can be determined based on the size of the bandwidth scheduled for the terminal. However, when the bandwidth is too small, PT-RS may not be scheduled, and when the bandwidth is too large, the frequency axis density can be configured to be low. These two cases can be considered as cases where the overhead caused by PT-RS is not large, and therefore, the impact can be ignored in CSI calculation. Therefore, the operation proposed in 4-3 can be applied to the case of a frequency density of 2 that triggers the maximum overhead on the frequency axis.

[0815] 3-2. The timeline pattern / density of PT-RS can be determined according to the MCS scheduled to the terminal, and when the MCS is low, the timeline density can be configured to be low. Therefore, the proposed operation can be applied to the case of triggering the time density of 1 of the maximum overhead on the timeline.

[0816] 3-3. As in the example, for a frequency density of 2 / time density of 1, a 2-port PT-RS can generate an overhead of 28 REs per 2 RBs. This can be approximately expressed as 14 REs / RB based on the terminal scheduling bandwidth.

[0817] In the current standard, the number of additional DMRSs is also included in the definition of CSI reference resources, and 14 REs / RBs can be considered as the overhead corresponding to one additional DMRSs, so it can be considered as the effective overhead that should be considered in CSI calculation.

[0818] In other words, when the above conditions are implicitly or explicitly indicated and / or met, the terminal can be considered as valid overhead that should be considered when performing CSI calculations on the 2-port PT-RS. In other words, the terminal can assume that the REs (or symbols) of the above-mentioned 2-port PT-RS are present in the CSI reference resources and derive the CQI index (and / or PMI, RI) based on them.

[0819] The time / frequency density of PT-RS can be configured based on the timeDensity and frequencyDensity in the higher-layer parameters PTRS-DownlinkConfig. Each of timeDensitys and frequencyDensity can indicate the thresholds ptrs-MCSi (i=1, 2, 3) and NRB,i (i=0, 1), respectively.

[0820] The operations in the above-mentioned proposals 1 to 4 may be applied independently and implemented by the wireless communication device. Alternatively, at least one or more operations in the above-mentioned proposals 1 to 4 may be combined and implemented by the wireless communication device.

[0821] Figure 28 is a diagram illustrating a method for transmitting and receiving channel state information according to an embodiment of the present disclosure.

[0822] Figure 28 The diagram illustrates the signaling between the network (e.g., TRP 1, TRP 2) and the UE in the case of multiple TRPs (i.e., M-TRP or multiple cells) (hereinafter, all TRPs may be replaced with cells) to which the method proposed in the present disclosure (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) can be applied. Here, UE / network is only an example, and the signaling between the network and the UE may be performed by using a method such as Figure 31 and Figure 32 The various equipment described in the replacement to apply. Figure 28 It is only for the convenience of description and does not limit the scope of the present disclosure. In addition, it can be omitted according to the situation and / or configuration. Figure 28 Some steps shown.

[0823] refer to Figure 28 , for ease of description, signaling between 2 TRPs and UE is considered, but it goes without saying that the corresponding signaling method can be extended and applied to signaling between multiple TRPs and multiple UEs. In the following description, the network can be a base station including multiple TRPs, or can be a cell including multiple TRPs. In the example, an ideal / non-ideal backhaul can be configured between TRP 1 and TRP 2 that configure the network. In addition, the following description is described based on multiple TRPs, but it can be equally extended and applied to transmission through multiple panels. In addition, in the present disclosure, the operation of the terminal receiving a signal from TRP 1 / TRP 2 can be interpreted / described (or can be an operation) as the operation of the terminal receiving a signal from the network (through / using TRP 1 / 2), and the operation of the terminal sending a signal to TRP 1 / TRP 2 can be interpreted / described (or can be an operation) as the operation of the terminal sending a signal to the network (through / using TRP 1 / TRP 2), or can be interpreted / described in reverse.

[0824] Furthermore, the following description uses the term "TRP." However, as described above, "TRP" can be applied by replacing it with expressions such as panel, antenna array, cell (e.g., macrocell / small cell / picocell, etc.), TP (transmission point), base station (gNB, etc.). As described above, TRPs can be categorized based on information (e.g., index, identifier (ID)) regarding a CORESET group (or CORESET pool) (e.g., CORESETpoolIndex). In this example, when a terminal is configured to perform transmission and reception with multiple TRPs (or cells), this can be represented as configuring multiple CORESET groups (or CORESET pools) for the terminal. This configuration of CORESET groups (or CORESET pools) can be performed via higher-layer signaling (e.g., RRC signaling, etc.). Furthermore, the term "base station" can generally refer to an object that performs data transmission and reception with a terminal. For example, a base station can be a concept that includes one or more TPs (transmission points), one or more TRPs (transmission and reception points), etc. Furthermore, TPs and / or TRPs can include a panel, a transmission and reception unit, etc. of a base station.

[0825] The UE may receive configuration (ie, configuration information) from the network through / using TRP 1 and / or TRP 2 ( S2801 ).

[0826] Here, the configuration (i.e., configuration information) may include system information (SI) and / or scheduling information and / or CSI-related configuration (e.g., CSI report settings, CSI-RS resource settings, etc.). In addition, the configuration (i.e., configuration information) may also include information related to network configuration (i.e., TRP configuration), resource information (resource allocation) related to transmission and reception based on multiple TRPs, configuration related to priority rules, etc. The configuration (i.e., configuration information) may be sent to higher layer signaling (e.g., RRC or MACCE). In addition, when the configuration information is predefined or preconfigured, the corresponding steps may be omitted.

[0827] For example, the configuration (i.e., configuration information) may include CORESET-related configuration information (e.g., ControlResourceSet IE) as described in the above-mentioned methods (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). The configuration information related to the CORESET may include an ID related to the CORESET (e.g., controlResourceSetID), an index of a CORESET pool for the CORESET (e.g., CORESETPoolIndex), a time / frequency resource configuration of the CORESET, TCI information related to the CORESET, etc. The CORESETPoolIndex corresponding to each TRP may be configured differently. For example, the configuration information may include PT-RS-related configuration (e.g., PhaseTrackingRS / PTRS-DownlinkConfig / timedensity / frequencydensity, etc.).

[0828] For example, the configuration (i.e., configuration information) may include configuration / indication values ​​for CSI calculation / acquisition / reporting considering multiple TRP transmissions based on the above proposals (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0829] For example, as in Proposal 1, multiple resource groups (multiple resources when only 1 resource is configured in the group) can be configured in one resource set (or resource setting) based on the configuration (i.e., configuration information). In addition, the number of TRPs corresponding to the resources in one resource set (i.e., the number of TRPs (the value of M, M can be equal to or greater than 1), etc.) can be configured based on the configuration (i.e., configuration information). In addition, N resource groups can be configured based on the configuration (i.e., configuration information). In addition, resource candidates and / or combinations of resource candidates in the M resources can be configured based on the configuration (i.e., configuration information). In addition, (one or more) specific TRPs and / or (one or more) specific TRP combinations and / or (one or more) specific resource combinations that can be used for CSI calculation can be configured based on the configuration (i.e., configuration information). In addition, the number of CSIs that should be reported by the UE (i.e., the number of CSI sets (the value of N), etc.) can be configured based on the configuration (i.e., configuration information). In addition, the configuration (i.e., configuration information) may include information about the number of CSIs that should be reported by the UE. Furthermore, the configuration (ie, configuration information) may include information on a CSI-IM (Interference Measurement) resource set used for interference measurement.

[0830] For example, as in Proposal 2, multiple resource sets can be configured in one resource setting based on the configuration (i.e., configuration information). In addition, the number of TRPs corresponding to the resource sets in one resource setting (i.e., the number of TRPs (the value of M, M can be equal to or greater than 1), etc.) can be configured based on the configuration (i.e., configuration information). In addition, N resource sets can be configured based on the configuration (i.e., configuration information). In addition, the resource set candidates and / or combinations of resource set candidates in the M resource sets can be configured based on the configuration (i.e., configuration information). In addition, (one or more) specific TRPs and / or (one or more) specific TRP combinations and / or (one or more) specific resource set combinations that can be used for CSI calculation can be configured based on the configuration (i.e., configuration information). In addition, the number of CSIs that should be reported by the UE (i.e., the number of CSI sets (the value of N), etc.) can be configured based on the configuration (i.e., configuration information). In addition, the configuration (i.e., configuration information) may include information about the number of CSIs that should be reported by the UE. In addition, the configuration (i.e., configuration information) may include information about the CSI-IM (interference measurement) resource set used for interference measurement.

[0831] In addition, the configuration (ie, configuration information) may include information required to perform the operations in the above-mentioned Proposals 1 to 4.

[0832] For example, in the above step S2801, the operations of sending and receiving configuration (ie, configuration information) may be performed by the following steps. Figure 31 and Figure 32 For example, refer to Figure 31 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive the configuration, and the one or more transceivers 106 may receive the configuration from the network.

[0833] The UE may receive RS (e.g., SSB / CSI-RS / TRS / PT-RS) for measuring channel status from the network through / using TRP 1 and / or TRP 2 (S2802). For example, when receiving RS through / using multiple TRPs, information about the relationship between RSs may be received.

[0834] Here, the UE may receive the RS in resources configured based on the configuration (ie, configuration information) received in step S2801 .

[0835] The UE may receive an indication regarding CSI reporting from the network via / using TRP 1 and / or TRP 2 (S2803). For example, for aperiodic CSI reporting, the indication may be performed by triggering a CSI report of a DCI. Alternatively, for semi-persistent CSI reporting / periodic CSI reporting, step S2803 may be omitted. In addition, steps S2802 and S2803 may be reversed or combined into one step.

[0836] For example, the operation of measuring the RS of the channel state and / or sending and receiving the indication of triggering CSI reporting in the above step S2802 and / or step S2803 may be performed by the following method. Figure 31 and Figure 32 For example, refer to Figure 31 The one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104, etc., to receive an indication of triggering a CSI report and / or an RS for measuring a channel state, and the one or more transceivers 106 may receive an indication of triggering a CSI report and / or an RS for measuring a channel state from a network.

[0837] The UE may perform CSI measurement based on information configured from the network and the RS (eg, the configuration in step S2801 , information through DCI, etc.) ( S2804 ).

[0838] Here, the UE can perform CSI measurements taking into account multiple TRP transmissions.

[0839] For example, the above proposals (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) may be based on when the UE performs CSI measurement.

[0840] For example, the CSI for one TRP may be calculated by considering RSs of other TRPs, etc. For example, the CSI entries (e.g., CRI / RI / PMI / LI / CQI, etc.) of each TRP may be configured differently. For example, the CSI for one TRP may be determined / calculated based on the CSI for other TRPs. For example, the UE may perform CSI measurement considering multi-TRP transmission based on CSI-related time behavior / resource configuration, etc.

[0841] For example, based on Proposal 1, assume that only one resource is configured in each resource group.

[0842] M (M is a natural number) CSI-RS resources can be selected from the CSI-RS resource set configured by the configuration information in step S2801. N (N≤M, N is a natural number) CSI-RS resources for reporting CSI can be selected from the M CSI-RS resources. In addition, through the configuration information in step S2801, CSI-RS resource candidates and / or combinations of CSI-RS resource candidates in the M CSI-RS resources can be configured, and N CSI-RS resources can be selected from the CSI-RS resource candidates and / or combinations of CSI-RS resource candidates. Here, the CSI may include N CSI sets generated based on the N CSI-RS resources. Each of the N CSI sets can be generated based on any one of the N CSI-RS resources used for channel measurement and the remaining N-1 CSI-RS resources used for interference measurement.

[0843] In another example, based on Proposal 1, a resource set may include M (M is a natural number) CSI-RS resource groups (here, each CSI-RS resource group may correspond to a separate TRP), and the M CSI-RS resource groups may determine N CSI-RS resource groups through configuration information or a predetermined rule. Here, the CSI may include N CSI sets generated based on a combination of CSI-RS resources in the N CSI-RS resource groups. The nth (1≤n≤N) CSI set of the N CSI sets may be generated based on a specific CSI-RS resource for channel measurement in the nth (1≤n≤N) CSI-RS resource group and CSI-RS resources in the remaining CSI-RS resource groups other than the nth CSI-RS resource group for interference measurement. In other words, in order to generate the nth (1≤n≤N) CSI set, specific CSI-RS resources in the nth (1≤n≤N) CSI-RS resource group can be used for channel measurement, and specific CSI-RS resources in the remaining CSI-RS resource groups except the nth CSI-RS resource group can be used for interference measurement.

[0844] In addition, the CSI may include N CSI sets generated based on a single CSI-RS resource in N (N≤M, N is a natural number) different CSI-RS resource groups in M ​​CSI-RS resource groups. In other words, the CSI may include one or more CSI sets for a single TRP.

[0845] In addition, for N CSI-RS resources (or resource groups) or CSI-RS resource combinations in N CSI-RS resource groups, QCL (quasi co-location) type reference signals for different spatial Rx parameters can be configured.

[0846] In addition, the configuration information in step S2801 may include information about CSI-IM (interference measurement) resources (or resource sets) used for interference measurement, and specific CSI-RS resource combinations in N CSI-RS resource groups may be mapped to the same CSI-IM resource.

[0847] In addition, layer indicators (LI) can be independently derived / reported by CSI for N CSI sets. In other words, LI can be reported independently for every N CSI-RS resource combinations (or CSI-RS resource groups). Here, the number of derived / reported LIs can be determined based on the maximum number of ports of the phase tracking reference signal (PTRS) configured in the terminal. In addition, when the number of CSI processing units (CPUs) required for calculating CSI is calculated (counted), CSI sets based on a single CSI resource and CSI sets based on a CSI-RS resource combination can be considered separately. For example, the CSI may include a first CSI set based on a single CSI resource in a CSI-RS resource set and / or a second CSI set based on a CSI-RS resource combination in a CSI-RS resource set. In this case, the number of CSI processing units (CPUs) required for calculating the second CSI set and the number of CPUs required for calculating the first CSI set can be determined separately. In addition, when the CSI-RS resource set includes M (M is a natural number) CSI-RS resource groups, the number of CPUs required for calculating the second CSI set can be determined based on the number of CSI-RS resources included in the CSI-RS resource group or based on the number of CSI-RS resource combinations that can be combined from the M CSI-RS resource groups (or twice the number of CSI-RS resource combinations that can be combined). In addition, based on N' CSI-RS resource combinations in N (N≤M, N is a natural number) CSI-RS resource groups configured from the M CSI-RS resource groups, the number of CPUs required for calculating the second CSI set can be determined based on the number of N' CSI-RS resource combinations in the N CSI-RS resource groups (or twice the number of N' CSI-RS resource combinations in the N CSI-RS resource groups).

[0848] In addition, if a CSI report based on a CSI-RS resource combination (i.e., a CSI report for multi-TRP transmission) conflicts with a CSI report based on a single CSI-RS resource (i.e., a CSI report for a single TRP transmission), the CSI report based on the CSI-RS resource combination may be sent first. Alternatively, on the contrary, the CSI report based on a single CSI-RS resource may be sent first. In addition, the priority of transmission may be determined based on the information based on the CSI-RS resource combination included in the CSI and the information based on the single CSI-RS resource included in the CSI. Here, such a priority rule may be configured through the configuration in step S2801.

[0849] In addition, for example, the CSI calculation time for CSI measurement of an mTRP (e.g., TRP 1 / TRP 2) can be determined based on the method described in the above-mentioned proposal #3. In this example, the CSI calculation time for CSI reporting based on a CSI-RS resource combination can be determined by adding a parameter value related to the CSI calculation time configured for CSI reporting based on a single CSI-RS resource.

[0850] For example, the CSI reference resources for CSI measurement of mTRP (e.g., TRP 1 / TRP 2) can be determined based on the method described in the above-mentioned proposal #4. For example, the CSI reference resources can be defined by considering the overhead of N (e.g., 2) port PT-RSs. In other words, in this example, in order to derive CSI, it can be assumed that there are resource elements for ports of 2 or more PTRSs in the CSI reference resources. For example, it can be implicitly / explicitly indicated whether the CSI reference resources will be determined by considering the overhead of N (e.g., 2) port PT-RSs. The indication can be based on the maximum number of PT-RS ports / the number of LI values ​​to be reported / bandwidth range / CQI-related parameters / PT-RS-related time density / frequency density, etc.

[0851] For example, the operation of measuring the channel state information in the above step S2804 can be performed by Figure 31 and Figure 32 For example, refer to Figure 31 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 , etc. to perform channel state measurement.

[0852] The UE may report CSI to the network through / using TRP 1 and / or TRP 2 ( S2805 ).

[0853] For example, the CSI reporting operation can be performed based on the description in the above-mentioned CSI report. For example, as described in the above-mentioned proposals (Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.), the CSI can be MTRP CSI or STRP CSI. For example, the channels / resources used for CSI feedback may overlap / conflict, and in this case, the CSI can be reported in descending order of priority based on the priority rules described in the above-mentioned proposals (Proposal 1 / 2). For example, the priority rules can be based on whether it is MTRP CSI or STRP CSI / the content of the CSI (such as CRI / RI / PMI / CQI / LI / RSRP / SINR) / the number of MTRPs associated with the CSI, etc. In the example, MTRP CSI can have a higher priority than STRP CSI. In the example, BM-related CSI can have a higher priority than other CSI. In the example, the priority can be determined in the order of BM-related MTRP CSI, BM-related STRP CSI, non-BMMTRP CSI, and non-BM STRP CSI. For example, discarding / puncturing / rate matching can be performed for CSI with low priority.

[0854] For example, the operation of sending and receiving CSI in the above step S2805 can be performed by Figure 31 and Figure 32 For example, refer to Figure 31 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to report the CSI, and the one or more transceivers 106 may send the CSI to the network.

[0855] The UE may receive data scheduling information and / or data / RS (for data decoding) based on the scheduling information from the network through / using TRP 1 and / or TRP 2 (S2806). In this case, the base station may determine / calculate data scheduling and precoding to be applied to the data based on CSI reported by the terminal, etc., but may not only consider the CSI reported by the terminal.

[0856] For example, the operation of sending and receiving data scheduling information and / or data / RS based on the data scheduling information in the above step S2806 may be performed by the following method. Figure 31 and Figure 32 For example, refer to Figure 31 , one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to receive data scheduling information and / or data / RS based on the scheduling information, and one or more transceivers 106 can receive data scheduling information and / or data / or RS based on the data scheduling information from the network.

[0857] As described above, the above signaling and operations between the network and the UE (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4 and Figure 28 ) can be provided by the devices described below (e.g., Figure 31 and 32 )accomplish.

[0858] For example, the above signaling and operations between the network and the UE (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4 and Figure 28 ) can be obtained by Figures 31 to 32 One or more processors (102, 202) in the process, and the above network side / UE signaling and operations (for example, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4 and Figure 28 ) can be used to drive Figures 31 to 32 The command / program (eg, instructions, executable code) of at least one processor (eg, 102, 202) is stored in a memory (eg, Figure 31 in one or more memories 104, 204).

[0859] Figure 29 is a diagram illustrating an operation of a terminal for transmitting channel state information according to an embodiment of the present disclosure.

[0860] Figure 29 The operations of the terminal based on Proposals 1 to 4 are illustrated. Figure 29 The examples are for ease of description and do not limit the scope of the present disclosure. Figure 29 In addition, Figure 29 The terminal is just an example and can be represented by the following Figure 31 and Figure 32 For example, Figure 31 The processor 102 / 202 in the embodiment may be controlled to transmit and receive channels / signals / data / information, etc. by using the transceiver 106 / 206, and may be controlled to store the channels / signals / data / information, etc. to be transmitted or received in the memory 104 / 204.

[0861] The terminal receives CSI-related configuration information from the base station ( S2901 ).

[0862] The CSI-related configuration information may include configuration / indicatio...

Claims

1. A method for transmitting channel state information (CSI) in a wireless communication system, the method being performed by a terminal, comprising: receiving, from a base station, configuration information related to the CSI, wherein the configuration information includes information about a CSI-reference signal (CSI-RS) resource set; receiving a CSI-RS from the base station; and sending the CSI to the base station based on the configuration information and the CSI-RS, The CSI-RS resource set includes M (M is a natural number) CSI-RS resource groups. wherein, a plurality of CSI-RS resource combinations for reporting the CSI are determined from the M CSI-RS resource groups; The CSI includes N (N is a natural number) CSI sets generated based on the multiple CSI-RS resource combinations. wherein, in order to generate an nth (1≤n≤N) CSI set, CSI-RS resources belonging to a CSI-RS resource group in one of the multiple CSI-RS resource combinations are used for channel measurement, and CSI-RS resources belonging to remaining CSI-RS resource groups other than the CSI-RS resource group in the one of the multiple CSI-RS resource combinations are used for interference measurement, and The CSI includes information other than a CSI-RS resource indicator (CRI) generated based on a single CSI-RS resource indicator (CRI) for each of the M CSI-RS resource groups.

2. The method according to claim 1, wherein A layer indicator (LI) is independently reported by the CSI for the N CSI sets.

3. The method according to claim 2, wherein: The number of the LIs is determined based on a maximum number of ports of a phase tracking reference signal (PTRS) configured in the terminal.

4. The method according to claim 1, wherein The plurality of CSI-RS resource combinations that should be calculated by the terminal are configured by the configuration information.

5. The method according to claim 1, wherein The configuration information includes information about CSI interference measurement (CSI-IM) resources used for interference measurement, A specific CSI-RS resource combination is mapped to the same CSI-IM resource.

6. The method according to claim 1, wherein For one of the multiple CSI-RS resource combinations, a quasi co-location (QCL) type reference signal for different spatial Rx parameters is configured.

7. The method according to claim 1, wherein A CSI calculation time for CSI reporting based on the multiple CSI-RS resource combinations is determined by adding additional time based on a parameter value related to a CSI calculation time configured for CSI reporting based on a single CSI-RS resource.

8. The method according to claim 1, wherein In order to derive the CSI, it is assumed that resource elements for two or more ports of a Phase Tracking Reference Signal (PTRS) exist in the CSI reference resource.

9. A terminal for transmitting channel state information (CSI) in a wireless communication system, the terminal comprising: at least one transceiver for transmitting and receiving wireless signals; as well as at least one processor configured to control the at least one transceiver, Wherein, the at least one processor is configured to: receiving, from a base station, configuration information related to the CSI, wherein the configuration information includes information about a CSI reference signal (CSI-RS) resource set; receiving a CSI-RS from the base station; and sending the CSI to the base station based on the configuration information and the CSI-RS, The CSI-RS resource set includes M (M is a natural number) CSI-RS resource groups. wherein, a plurality of CSI-RS resource combinations for reporting the CSI are determined from the M CSI-RS resource groups; The CSI includes N (N is a natural number) CSI sets generated based on the multiple CSI-RS resource combinations. wherein, in order to generate an nth (1≤n≤N) CSI set, CSI-RS resources belonging to a CSI-RS resource group in one of the multiple CSI-RS resource combinations are used for channel measurement, and CSI-RS resources belonging to remaining CSI-RS resource groups other than the CSI-RS resource group in the one of the multiple CSI-RS resource combinations are used for interference measurement, and The CSI includes information other than a CSI-RS resource indicator (CRI) generated based on a single CSI-RS resource indicator (CRI) for each of the M CSI-RS resource groups.

10. The terminal according to claim 9, wherein: A layer indicator (LI) is independently reported by the CSI for the N CSI sets. The terminal according to claim 10 , wherein: The number of the LIs is determined based on a maximum number of ports of a phase tracking reference signal (PTRS) configured in the terminal.

12. The terminal according to claim 9, wherein: The plurality of CSI-RS resource combinations that should be calculated by the terminal are configured by the configuration information.

13. A method for receiving channel state information (CSI) in a wireless communication system, the method being performed by a base station, comprising: Sending configuration information related to the CSI to a terminal, wherein the configuration information includes information about a CSI reference signal (CSI-RS) resource set; sending a CSI-RS to the terminal; and receiving the CSI from the terminal, The CSI-RS resource set includes M (M is a natural number) CSI-RS resource groups. wherein, a plurality of CSI-RS resource combinations for reporting the CSI are determined from the M CSI-RS resource groups; The CSI includes N (N is a natural number) CSI sets generated based on the multiple CSI-RS resource combinations. wherein, in order to generate an nth (1≤n≤N) CSI set, CSI-RS resources belonging to a CSI-RS resource group in one of the multiple CSI-RS resource combinations are used for channel measurement, and CSI-RS resources belonging to remaining CSI-RS resource groups other than the CSI-RS resource group in the one of the multiple CSI-RS resource combinations are used for interference measurement, and The CSI includes information other than a CSI-RS resource indicator (CRI) generated based on a single CSI-RS resource indicator (CRI) for each of the M CSI-RS resource groups.

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