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

Abstract

A method and an apparatus for transmitting and receiving channel state information in a wireless communication system are disclosed. A method for transmitting channel state information (CSI) according to an embodiment of the present disclosure may comprise the steps of: receiving configuration information related to CSI from a base station, where the configuration information includes information on 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 can comprise M (M is a natural number) CSI-RS resource groups; n (N is a natural number less than or equal to M) CSI-RS resource groups used for reporting CSI can be determined from M CSI-RS resource groups; the CSI may comprise N CSI sets generated based on the CSI-RS resource combination in the N CSI-RS resource groups; in order to generate an nth CSI set (1 < = n < = N), a specific CSI-RS resource in the nth CSI-RS resource group (1 < = n < = N) may be used for channel measurement; and specific CSI-RS resources in the remaining CSI-RS groups except for the nth CSI-RS resource group can be used for interference measurement.

Description

[0001] This application is a divisional application of the patent application with application number 202180006536.2 (international application number PCT / KR2021 / 001895) filed on May 18, 2022, with the international application date of February 15, 2021, the title of which is "Method and apparatus for transmitting and receiving channel state information in a wireless communication system." TECHNICAL FIELD

[0002] The disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving channel state information in a wireless communication system. BACKGROUND

[0003] A mobile communication system has been developed to provide a voice service while securing the mobility of a user. However, the mobile communication system has been expanded to a data service as well as a voice service, and currently, an explosive increase in traffic has led to a shortage of resources, and users have required faster services, and thus a more advanced mobile communication system has been required.

[0004] The overall requirements of the next-generation mobile communication system should be able to support the accommodation of explosive data traffic, a significant increase in the transmission rate per user, the accommodation of a significantly increased number of connected devices, a very low end-to-end latency, and high energy efficiency. To this end, various technologies such as dual connectivity, massive multiple input multiple output (massive MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, device networking, etc. have been researched. SUMMARY

[0005] TECHNICAL PROBLEM

[0006] The technical object of the disclosure is to provide a method and apparatus for transmitting and receiving channel state information.

[0007] In addition, an additional technical object of the disclosure is to provide a method and apparatus for transmitting and receiving joint channel state information of channel state information reference signals (CSI-RSs) transmitted from a plurality of TRPs (transmission reception points).

[0008] The technical objects achieved by the disclosure are not limited to the above-mentioned technical objects, and other technical objects not described herein will be clearly understood by a person skilled in the art from the following description.

[0009] TECHNICAL SOLUTION

[0010] A method of transmitting channel state information (CSI) in a wireless communication system according to one aspect of the present disclosure can include receiving configuration information related to CSI from a base station, wherein the configuration information includes information on 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 can 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 can be determined from the M CSI-RS resource groups, the CSI can include N CSI sets generated based on CSI-RS resource combinations in the N CSI-RS resource groups, for generating an n-th (1≤n≤N) CSI set, a specific CSI-RS resource in an n-th (1≤n≤N) CSI-RS resource group can be used for channel measurement, and a specific CSI-RS resource in a remaining CSI-RS group other than the n-th CSI-RS resource group can be used for interference measurement.

[0011] A terminal transmitting channel state information (CSI) according to another aspect of the present disclosure can include at least one transceiver for transmitting and receiving a wireless signal, and at least one processor controlling the at least one transceiver. The at least one processor can be configured to receive configuration information related to CSI from a base station, wherein the configuration information includes information on 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 can 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 can be determined from the M CSI-RS resource groups, the CSI can include N CSI sets generated based on CSI-RS resource combinations in the N CSI-RS resource groups, for generating an n-th (1≤n≤N) CSI set, a specific CSI-RS resource in an n-th (1≤n≤N) CSI-RS resource group can be used for channel measurement, and a specific CSI-RS resource in a remaining CSI-RS group other than the n-th CSI-RS resource group can be used for interference measurement.

[0012] A method of receiving channel state information (CSI) in a wireless communication system according to another aspect of the disclosure can include transmitting configuration information related to CSI to a terminal, wherein the configuration information includes information on 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 can 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 can be determined from the M CSI-RS resource groups, the CSI can include N CSI sets generated based on CSI-RS resource combinations in the N CSI-RS resource groups, for generating an n-th (1≤n≤N) CSI set, a specific CSI-RS resource in an n-th (1≤n≤N) CSI-RS resource group can be used for channel measurement, and a specific CSI-RS resource in a remaining CSI-RS group other than the n-th CSI-RS resource group can be used for interference measurement.

[0013] 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 configuration information related to CSI from a base station, wherein the configuration information includes information on 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 can 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 can be determined from the M CSI-RS resource groups, the CSI can include N CSI sets generated based on CSI-RS resource combinations in the N CSI-RS resource groups, for generating an n-th (1≤n≤N) CSI set, a specific CSI-RS resource in an n-th (1≤n≤N) CSI-RS resource group can be used for channel measurement, and a specific CSI-RS resource in a remaining CSI-RS group other than the n-th CSI-RS resource group can be used for interference measurement.

[0014] A processing apparatus configured to control a terminal for transmitting CSI (Channel State Information) in a wireless communication system can include at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on execution by the at least one processor, perform operations. The operations can include receiving configuration information related to CSI from a base station, wherein the configuration information includes information on CSI-RS resource sets; 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 sets can 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 can be determined from the M CSI-RS resource groups, and the CSI can include N CSI sets generated based on CSI-RS resource combinations in the N CSI-RS resource groups. For generating an n-th (1 ≤ n ≤ N) CSI set, a specific CSI-RS resource in an n-th (1 ≤ n ≤ N) CSI-RS resource group can be used for channel measurement, and a specific CSI-RS resource in a remaining CSI-RS group other than the n-th CSI-RS resource group can be used for interference measurement.

[0015] Preferably, a layer indicator (LI) can be independently reported for the N CSI sets by the CSI.

[0016] Preferably, the number of LIs can be determined based on a maximum number of ports of a phase tracking reference signal (PTRS) configured in the terminal.

[0017] Preferably, a CSI-RS resource combination that should be calculated by the terminal among the N CSI-RS resource groups can be configured by the configuration information.

[0018] Preferably, the configuration information can include information on a CSI interference measurement (CSI-IM) resource for interference measurement, and a specific CSI-RS resource combination among the N CSI-RS resource groups can be mapped to the same CSI-IM resource.

[0019] Preferably, for a CSI-RS resource combination among the N CSI-RS resource groups, a quasi co-location (QCL) type reference signal for different spatial Rx parameters can be configured.

[0020] Preferably, a CSI computation time for a CSI report based on a CSI-RS resource combination can be determined by adding an additional time based on a parameter value related to a CSI computation time configured for a CSI report based on a single CSI-RS resource.

[0021] Preferably, in order to derive the CSI, it can be assumed that there are resource elements for 2 or more ports of a phase tracking reference signal (PTRS) in the CSI reference resource.

[0022] Advantages

[0023] According to embodiments of the disclosure, optimal channel state information for performing transmission of multiple TRPs (transmission reception points) can be acquired / reported.

[0024] In addition, according to embodiments of the 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.

[0025] In addition, according to embodiments of the disclosure, when optimal channel state information for performing transmission of multiple TRPs (transmission reception points) is acquired / reported, performance of a wireless communication system can be improved.

[0026] Effects that can be achieved by the disclosure are not limited to the above-mentioned effects, and other effects not described herein can be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included as part of the detailed description to understand the disclosure, provide embodiments of the disclosure and describe technical features of the disclosure through the detailed description.

[0028] Figure 1 The structure of a wireless communication system to which the disclosure can be applied is illustrated.

[0029] Figure 2 The frame structure in a wireless communication system to which the disclosure can be applied is illustrated.

[0030] Figure 3 The resource grid in a wireless communication system to which the disclosure can be applied is illustrated.

[0031] Figure 4 The physical resource block in a wireless communication system to which the disclosure can be applied is illustrated.

[0032] Figure 5 The slot structure in a wireless communication system to which the disclosure can be applied is illustrated.

[0033] Figure 6 The physical channel used in a wireless communication system to which the disclosure can be applied and a general signal transmission and reception method using the same are illustrated.

[0034] Figure 7 A method of transmitting multiple TRPs in a wireless communication system to which the disclosure can be applied is illustrated.

[0035] Figure 8 FIG. illustrates an interference signal of a terminal when a plurality of TRPs are transmitted in a wireless communication system to which the disclosure can be applied.

[0036] Figure 9 FIG. illustrates a resource group in a CSI set and a resource set according to an embodiment of the disclosure.

[0037] Figure 10 FIG. illustrates a resource group in a CSI set and a resource set according to an embodiment of the disclosure.

[0038] Figure 11 and Figure 12 FIG. illustrates a resource group in a CSI set and a resource set according to an embodiment of the disclosure.

[0039] Figure 13 FIG. illustrates information on a CDM group and a DMRS port corresponding to each layer based on all RIs according to an embodiment of the disclosure.

[0040] Figure 14 FIG. is a diagram illustrating a mapping relationship between a resource for channel measurement and a resource for interference measurement in a wireless communication system to which the disclosure can be applied.

[0041] Figures 15 to 17 FIG. is a diagram illustrating a mapping relationship between a resource for channel measurement and a resource for interference measurement according to an embodiment of the disclosure.

[0042] Figure 18 FIG. illustrates an operation of receiving a CSI-RS in which a different plurality of QCL TypeD reference resources are configured according to an embodiment of the disclosure.

[0043] Figure 19 FIG. illustrates a resource set and a CSI set according to an embodiment of the disclosure.

[0044] Figure 20 FIG. illustrates a resource group in a CSI set and a resource set according to an embodiment of the disclosure.

[0045] Figure 21 and Figure 22 FIG. illustrates a resource group in a CSI set and a resource set according to an embodiment of the disclosure.

[0046] Figure 23 FIG. illustrates information on a CDM group and a DMRS port corresponding to each layer based on all RIs according to an embodiment of the disclosure.

[0047] Figures 24 to 26 FIG. is a diagram illustrating a mapping relationship between a resource for channel measurement and a resource for interference measurement according to an embodiment of the disclosure.

[0048] Figure 27 FIG. 2 is a diagram illustrating an operation of receiving a CSI-RS configured with different multiple QCL TypeD reference resources according to an embodiment of the disclosure.

[0049] Figure 28 FIG. 3 is a diagram illustrating a method for transmitting and receiving channel state information according to an embodiment of the disclosure.

[0050] Figure 29 FIG. 4 is a diagram illustrating an operation of a terminal for transmitting channel state information according to an embodiment of the disclosure.

[0051] Figure 30 FIG. 5 is a diagram illustrating an operation of a base station for receiving channel state information according to an embodiment of the disclosure.

[0052] Figure 31 FIG. 6 is a diagram illustrating a block diagram of a wireless communication device according to an embodiment of the disclosure.

[0053] Figure 32 FIG. 7 illustrates a vehicle device according to an embodiment of the disclosure. DETAILED DESCRIPTION

[0054] Hereinafter, embodiments according to the disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed in the accompanying drawings is intended to describe exemplary embodiments of the disclosure, and is not intended to represent the only embodiments in which the disclosure can be implemented. The following detailed description includes specific details to provide a complete understanding of the disclosure. However, those skilled in the relevant art will know that the disclosure can be implemented without the specific details.

[0055] In some cases, known structures and devices can be omitted, or can be shown in the form of a block diagram based on a core function of each structure and device in order to facilitate the prevention of obscuring the concept of the disclosure.

[0056] In the disclosure, when an element is referred to as being "connected", "combined", or "linked" to another element, it can include an indirect connection relationship between the other element and a further element in addition to a direct connection relationship. In addition, in the disclosure, the term "include" or "have" designates the existence of the mentioned features, steps, operations, components, and / or elements, but does not exclude the existence or addition of one or more other features, stages, operations, components, elements, and / or groups thereof.

[0057] In the disclosure, terms such as "first", "second", and the like are used only to distinguish one element from another element, and are not used to limit the elements, unless otherwise specified, and do not limit the order or importance between the elements, etc. Therefore, within the scope of the disclosure, a first element in an embodiment can be referred to as a second element in another embodiment, and likewise, a second element in an embodiment can be referred to as a first element in another embodiment.

[0058] The terms used in the present disclosure are used to describe specific embodiments, and are not intended to limit the claims. As used in the description of embodiments and the appended claims, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "and / or" used in the present disclosure can refer to one of the relevant listed items, or mean that it refers to and includes any and all possible combinations of two or more of them. In addition, unless otherwise stated, " / " between words in the present disclosure has the same meaning as "and / or".

[0059] The present disclosure describes a wireless communication network or a wireless communication system, and operations performed in a wireless communication network can be performed in a process in which a device (e.g., a base station) controlling a network and transmitting or receiving a signal controls the corresponding wireless communication network, or can be performed in a process in which a terminal associated with the corresponding wireless network transmits or receives a signal between the network or the terminal.

[0060] In the present disclosure, a transmission or reception channel includes the meaning of transmitting or receiving information or a signal through a corresponding channel. For example, transmitting a control channel means transmitting control information or a control signal through a control channel. Similarly, transmitting a data channel means transmitting data information or a data signal through a data channel.

[0061] Hereinafter, 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, a transmitter can be a part of a base station, and a receiver can be a part of a terminal. In the uplink, a transmitter can be a part of a terminal, and a receiver can be a part of a base station. The base station can be expressed as a first communication device, and the terminal can be expressed as a second communication device. The base station (BS) can be replaced with 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 as well as mobile, and can be replaced with terms such as a UE (user equipment), a MS (mobile station), a UT (user terminal), a MSS (mobile subscriber station), a SS (subscriber station), an AMS (advanced mobile station), a WT (wireless terminal), an MTC (machine type communication) device, an M2M (machine-to-machine) device, a D2D (device-to-device) device, a vehicle, an RSU (roadside unit), a robot, an AI (artificial intelligence) module, a drone (UAV: unmanned aerial vehicle), an AR (augmented reality) device, a VR (virtual reality) device, etc.

[0062] The following description can be used for various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. CDMA can be implemented by such a radio technology as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented by such a radio technology as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented by such a radio technology as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), and the like. UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (Third Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA and LTE-A (Advanced) / LTE-A pro is a high-speed version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is a high-speed version of 3GPP LTE / LTE-A / LTE-A pro.

[0063] For the sake of clarity, the description is made based on a 3GPP communication system (e.g., LTE-A, NR), but the technical idea of the disclosure is not limited thereto. LTE means a technology after Release 8 of 3GPP TS (Technical Specification) 36.xxx. Specifically, LTE technology in or after Release 10 of 3GPP TS 36.xxx is referred to as LTE-A, and LTE technology in or after Release 13 of 3GPP TS 36.xxx is referred to as LTE-A pro. 3GPP NR means a technology in or after Release 15 of TS 38.xxx. LTE / NR can be referred to as a 3GPP system. "xxx" means a detailed number of a standard document. LTE / NR can be generally referred to as a 3GPP system. For the background art, terms, abbreviations, etc. used to describe the disclosure, matters described in standard documents published before the disclosure can be referred to. For example, the following documents can be referred to.

[0064] For 3GPP LTE, TS 36.211 (Physical channels and modulation), TS 36.212 (Multiplexing and channel coding), TS 36.213 (Physical layer procedures), TS 36.300 (Overall description), TS 36.331 (Radio Resource Control) can be referred to.

[0065] For 3GPP NR, reference can be made 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 (New Generation-Radio Access Network) overall description), TS 38.331 (Radio Resource Control protocol specification).

[0066] Abbreviations of terms that can be used in this disclosure are defined as follows.

[0067] -BM: Beam Management

[0068] -CQI: Channel Quality Indicator

[0069] -CRI: Channel State Information - Reference Signal Resource Indicator

[0070] -CSI: Channel State Information

[0071] -CSI-IM: Channel State Information - Interference Measurement

[0072] -CSI-RS: Channel State Information - Reference Signal

[0073] -DMRS: Demodulation Reference Signal

[0074] -FDM: Frequency Division Multiplexing

[0075] -FFT: Fast Fourier Transform

[0076] -IFDMA: Interleaved Frequency Division Multiple Access

[0077] -IFFT: Inverse Fast Fourier Transform

[0078] -L1-RSRP: Layer 1 Reference Signal Received Power

[0079] -L1-RSRQ: Layer 1 Reference Signal Received Quality

[0080] -MAC: Medium Access Control

[0081] -NZP: Non-Zero Power

[0082] -OFDM: Orthogonal Frequency Division Multiplexing

[0083] -PDCCH: Physical Downlink Control Channel

[0084] -PDSCH: Physical Downlink Shared Channel

[0085] -PMI: Precoding Matrix Indicator

[0086] -RE: Resource Element

[0087] - RI: Rank Indicator

[0088] - RRC: Radio Resource Control

[0089] - RSSI: Received Signal Strength Indicator

[0090] - Rx: Reception

[0091] - QCL: Quasi Co-Location

[0092] - SINR: Signal to Interference Noise Ratio

[0093] - SSB (or SS / PBCH block): Synchronization Signal Block (including PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), and PBCH (Physical Broadcast Channel))

[0094] - TDM: Time Division Multiplexing

[0095] - TRP: Transmission and Reception Point

[0096] - TRS: Tracking Reference Signal

[0097] - Tx: Transmission

[0098] - UE: User Equipment

[0099] - ZP: Zero Power

[0100] Overall system

[0101] As more communication devices require higher capacity, there has been a demand for improved mobile broadband communication compared to existing radio access technologies (RATs). In addition, massive MTC (Machine Type Communication) that provides various services anytime anywhere by connecting multiple devices and things is also one of the main issues to be considered in the next-generation communication. In addition, communication system design considering services / terminals sensitive to reliability and latency is also discussed. Therefore, the introduction of the next-generation RAT considering eMBB (enhanced mobile broadband communication), mMTC (massive MTC), URLLC (ultra-reliable and low-latency communication), etc. is discussed, and for convenience, the corresponding technology is referred to as NR in the present disclosure. NR is an expression indicating an example of a 5G RAT.

[0102] A new RAT system including the NR uses an OFDM transmission method or a transmission method similar thereto. The new RAT system can follow OFDM parameters different from those of the LTE. Alternatively, the new RAT system follows the parameters of the existing LTE / LTE-A as they are, but can support a wider system bandwidth (for example, 100 MHz). Alternatively, one cell can support multiple numerologies. In other words, terminals operating according to different numerologies can coexist in one cell.

[0103] A numerology corresponds to one subcarrier spacing in a frequency domain. Different numerologies can be defined as the reference subcarrier spacing is scaled by an integer N.

[0104] Figure 1 The structure of a wireless communication system to which the disclosure can be applied is illustrated.

[0105] Reference Figure 1 , the NG-RAN is configured with gNBs providing control plane (RRC) protocol endpoints for NG-RA (NG Radio Access) user plane (i.e., new AS (Access Stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and UEs. The gNBs are interconnected with each other over an Xn interface. In addition, the gNBs are connected to a NGC (Next Generation Core) through an NG interface. More specifically, the gNBs connect to an AMF (Access and Mobility Management Function) through an N2 interface and connect to a UPF (User Plane Function) through an N3 interface.

[0106] Figure 2 The frame structure in a wireless communication system to which the disclosure can be applied is illustrated.

[0107] The NR system can support multiple numerologies. Here, a numerology can be defined by a subcarrier spacing and a cyclic prefix (CP) overhead. Here, multiple subcarrier spacings can be derived by scaling a basic (reference) subcarrier spacing by an integer N (or, μ). In addition, although it is assumed that a very low subcarrier spacing is not used in a very high carrier frequency, a numerology to be used can be selected independently of a frequency band. Further, various frame structures according to multiple numerologies can be supported in the NR system.

[0108] Hereinafter, OFDM numerologies and frame structures that can be considered in the NR system will be described. Multiple OFDM numerologies supported in the NR system can be defined as in Table 1 below.

[0109] [Table 1]

[0110]

[0111] NR supports multiple numerologies (or subcarrier spacings (SCSs)) for supporting various 5G services. For example, when the SCS is 15 kHz, wide areas of legacy cellular bands are supported; and when the SCS is 30 kHz / 60 kHz, dense cities, lower latency, and wider carrier bandwidths are supported; and when the SCS is 60 kHz or more, bandwidths exceeding 24.25 GHz are supported to overcome phase noise. NR bands are defined as two types (FR1, FR2) of frequency ranges. FR1, FR2 can be configured as in Table 2 below. In addition, FR2 can mean millimeter wave (mmW).

[0112] [Table 2]

[0113]

[0114] Regarding the frame structure in the NR system, the size of various fields in the time domain is expressed as a multiple of a time unit of T c =1 / (Δf max ·N f )。 Here, Δf max i is 480·10 3 Hz, and N f is 4096. Downlink and uplink transmissions are configured (organized) as radio frames having a duration T f= 1 / (Δf max N f / 100)·T c =10ms. Here, the radio frame is configured with 10 subframes, each having a duration of T sf =(Δf max N f / 1000)·T c . In this case, there can be one frame set for uplink, and one frame set for downlink. In addition, transmission in the i-th uplink frame from a terminal should start T TA =(N TA +N TA,offset )T c earlier than the corresponding downlink frame in the corresponding terminal. For a subcarrier spacing configuration μ, slots are numbered in increasing order of n s μ ∈{0,..., N slot subframe,μ -1} in a subframe, and in increasing order of n s,f μ ∈{0,..., N slot frame,μ -1} in a radio frame. One slot is configured with N symb slotN consecutive OFDM symbols, and N symb slot Determined based on CP. Slot n in the subframe s μ The start of the OFDM symbol n in the same subframe s μ N symb slot The start times are arranged chronologically. All terminals may not perform transmission and reception simultaneously, meaning that all OFDM symbols in either the downlink or uplink time slots may not be available. Table 3 shows the number of OFDM symbols (N) per time slot in a normal CP. symb slot ), Number of time slots per radio frame (N) slot frame,μ ) and the number of time slots per subframe (N) slot subframe,μ Table 4 shows 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.

[0115] [Table 3]

[0116]

[0117] [Table 4]

[0118]

[0119] Figure 2 This is an example with μ=2 (SCS is 60kHz), see Table 3. One subframe can include 4 time slots. For example... Figure 2 The subframe shown as {1,2,4} is an example; the number of time slots that can be included in a subframe is defined in Table 3 or Table 4. Additionally, micro-time slots can include 2, 4, or 7 symbols, or more or fewer symbols. Regarding physical resources in an NR system, antenna ports, resource grids, resource elements, resource blocks, carrier portions, etc., can be considered. The physical resources that can be considered in an NR system will be described in detail below.

[0120] First, regarding antenna ports, an antenna port is defined such that the channel carrying symbols in that antenna port can be inferred from the channels carrying other symbols in the same antenna port. Two antenna ports can be said to be in a QC / QCL (quasi-co-location or quasi-co-addressable) relationship when the large-scale properties of the channel carrying symbols in one antenna port can be inferred from the channels carrying symbols in another antenna port. In this case, the large-scale properties include at least one of delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0121] Figure 3A resource grid of a wireless communication system to which the disclosure can be applied is illustrated.

[0122] Reference Figure 3 , a resource grid is illustratively described as being configured with N RB μ N sc RB subcarriers in the frequency domain, and one subframe is configured with 14·2 μ OFDM symbols, but is not limited thereto. In the NR system, a transmitted signal is described by 2 μ N symb （μ） OFDM symbols and one or more resource grids configured with N RB μ N sc RB subcarriers. Here, N RB μ ≤ N RB max,μ . N RB max,μ denotes a maximum transmission bandwidth, which can be different between uplink and downlink and between numerologies. In this case, one resource grid can be configured per 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 the index pair (k, l'). Here, k = 0,..., N RB μ N sc RB - 1 is an index in the frequency domain, and l' = 0,..., 2 μ N symb （μ） - 1 refers to a symbol position in a subframe. When referring to a resource element in a slot, the 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 a complex value a k,l' （p,μ） When there is no risk of confusion or when a specific antenna port or numerology is not specified, the indices p and μ can be dropped, and then the complex value can be a k,l' （p） or a k,l' . In addition, a resource block (RB) is defined as N sc RB = 12 contiguous subcarriers in the frequency domain.

[0123] A point serves as a common reference point of a resource block grid and is obtained as follows.

[0124] - offsetToPointA of a primary cell (PCell) downlink indicates a frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with an SS / PBCH block used by the terminal for initial cell selection. It is expressed in units of resource blocks assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2.

[0125] - absoluteFrequencyPointA indicates a frequency location of point A expressed in ARFCN (absolute radio frequency channel number).

[0126] For a 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". The common resource block number n for subcarrier spacing configuration μ in the frequency domain is given by the following equation 1. CRB μ The relationship between a resource element (k, l) and a common resource block n for subcarrier spacing configuration μ in the frequency domain is given by the following equation 2.

[0127] [Equation 2]

[0128]

[0129] In equation 1, k is defined with respect to point A such that k = 0 corresponds to the subcarrier centered at point A. Physical resource blocks are numbered from 0 to N BWP,i size,μ - 1 and i is the number of the BWP. Physical resource block n PRB in BWP i is given by the following equation 1. CRB The relationship between a resource element (k, l) and a common resource block n for subcarrier spacing configuration μ in the frequency domain is given by the following equation 2.

[0130] [Equation 2]

[0131]

[0132] N BWP,i start,μ is the common resource block where the BWP starts with respect to common resource block 0.

[0133] Figure 4 A wireless communication system in which the present disclosure can be applied is illustrated. Also, Figure 5 A slot structure in a wireless communication system in which the present disclosure can be applied is illustrated.

[0134] Referring to Figure 4 and Figure 5 , a slot includes a plurality of symbols in the time domain. For example, 1 slot includes 7 symbols for a normal CP, but 1 slot includes 6 symbols for an extended CP.

[0135] A carrier includes multiple subcarriers in a frequency domain. A RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in a frequency domain. A BWP (Bandwidth Part) is defined as multiple consecutive (physical) resource blocks in a frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed through an activated BWP, and only one BWP can be activated for one terminal. In a resource grid, each element is referred to as a resource element (RE) and one complex symbol can be mapped.

[0136] In an NR system, each component carrier (CC) can support up to 400 MHz. If a terminal operating in such a wideband CC always operates to turn on a radio frequency (RF) chip for the entire CC, terminal battery consumption can increase. Alternatively, when considering multiple application cases operating in one wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different numerologies (e.g., subcarrier spacing, etc.) can be supported in each frequency band in the corresponding CC. Alternatively, each terminal can have different capabilities for the maximum bandwidth. In consideration of this, a base station can instruct a terminal to operate only in part of the bandwidth, rather than in the full bandwidth of the wideband CC, and for convenience, the corresponding part of the bandwidth is defined as a bandwidth part (BWP). A BWP can be configured with consecutive RBs on a frequency axis and can correspond to one numerology (e.g., subcarrier spacing, CP length, slot / min-slot duration).

[0137] Meanwhile, even in one CC configured to a terminal, the base station can configure multiple BWPs. For example, a BWP occupying a relatively small frequency domain can be configured in a PDCCH monitoring slot, and a PDSCH indicated by a PDCCH can be scheduled in a larger BWP. Alternatively, when UEs are congested in a specific BWP, some terminals can be configured with other BWPs for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between neighboring cells, etc., some middle frequency spectrum of the full bandwidth can be excluded, and BWPs on both edges can be configured in the same slot. In other words, the base station can configure at least one DL / UL BWP to 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 (through L1 signaling or MAC CE (Control Element) or RRC signaling, etc.). In addition, the base station can indicate switching to other configured DL / UL BWPs (through L1 signaling or MAC CE or RRC signaling, etc.). Alternatively, based on a timer, when a timer value expires, switching to a determined DL / UL BWP can be made. Here, the activated DL / UL BWP is defined as an active DL / UL BWP. However, before the terminal performs an initial access procedure or sets up an RRC connection, a configuration on the DL / UL BWP can not be received, so the DL / UL BWP assumed by the terminal in these cases is defined as an initial active DL / UL BWP.

[0138] Figure 6 A physical channel used in a wireless communication system to which the disclosure is applicable and a general signal transmission and reception method using the same are illustrated.

[0139] In a wireless communication system, a terminal receives information from a base station through a downlink and transmits information to the base station through an uplink. The information transmitted and received by the base station and the terminal includes data and various control information, and there are various physical channels according to the type / use of the information they transmit and receive.

[0140] When a terminal is turned on or newly enters a cell, it performs an initial cell search including synchronization with a base station, etc. (S601). For the initial cell search, the terminal can synchronize with the base station by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station and acquire information such as a cell identifier (ID), etc. Then, the terminal can acquire broadcast information in the cell by receiving a physical broadcast channel (PBCH) from the base station. Meanwhile, the terminal can check a downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell search stage.

[0141] The terminal that completes the initial cell search can acquire 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).

[0142] Meanwhile, when the terminal first accesses to the base station or does not have a radio resource for signal transmission, it can perform a random access (RACH) procedure to the base station (S603 to S606). For the random access procedure, the terminal can transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S603 and S605), and can receive a response message to the preamble through a PDCCH and a corresponding PDSCH (S604 and S606). A contention-based RACH can additionally perform a contention resolution procedure.

[0143] The terminal that performs the above procedure later 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 procedure. Specifically, the terminal receives downlink control information (DCI) through a PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and the format varies according to its use purpose.

[0144] Meanwhile, control information transmitted by the terminal to the base station through an uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK (acknowledgement / non-acknowledgement) signal, a CQI (channel quality indicator), a PMI (precoding matrix indicator), an RI (rank indicator), etc. For a 3GPP LTE system, the terminal can transmit the above control information of CQI / PMI / RI, etc. through a PUSCH and / or a PUCCH.

[0145] Table 5 represents an example of a DCI format in an NR system.

[0146] [Table 5]

[0147]

[0148] Referring to Table 5, the DCI formats 0_0, 0_1, and 0_2 can include resource information (e.g., UL / SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), information related to a transport block (TB) (e.g., MCS (Modulation Coding and 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 multiple antennas (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information related to scheduling of PUSCH (e.g., PUSCH power control, etc.), and control information included in each DCI format can be predefined. The DCI format 0_0 is used to schedule PUSCH in one cell. Information included in the 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 Coding Scheme Cell RNTI) and is transmitted.

[0149] The DCI format 0_1 is used to indicate scheduling of one or more PUSCHs or to configure a terminal in one cell with grant (CG) downlink feedback information. Information included in the DCI format 0_1 is scrambled by C-RNTI or CS-RNTI or SP-CSI-RNTI (Semi-Persistent CSI RNTI) or MCS-C-RNTI and is transmitted.

[0150] The DCI format 0_2 is used to schedule PUSCH in one cell. Information included in the DCI format 0_2 is scrambled by C-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI and is transmitted.

[0151] Next, the DCI formats 1_0, 1_1, and 1_2 can include resource information (e.g., frequency resource allocation, time resource allocation, VRB (Virtual Resource Block)-PRB (Physical Resource Block) mapping, etc.), information related to a transport block (TB) (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 port, TCI (Transmission Configuration Indicator), SRS (Sounding Reference Signal) request, etc.), information related to PUCCH with respect to scheduling of PDSCH (e.g., PUCCH power control, PUCCH resource indicator, etc.), and control information included in each DCI format can be predefined.

[0152] The DCI format 1_0 is used to schedule a PDSCH in one DL cell. Information included in the DCI format 1_0 is CRC scrambled by a C-RNTI or a CS-RNTI or an MCS-C-RNTI and transmitted.

[0153] The DCI format 1_1 is used to schedule a PDSCH in one cell. Information included in the DCI format 1_1 is CRC scrambled by a C-RNTI or a CS-RNTI or an MCS-C-RNTI and transmitted.

[0154] The DCI format 1_2 is used to schedule a PDSCH in one cell. Information included in the DCI format 1_2 is CRC scrambled by a C-RNTI or a CS-RNTI or an MCS-C-RNTI and transmitted.

[0155] CSI-related operations

[0156] In an NR (New Radio) system, a CSI-RS (Channel State Information-Reference Signal) is used for time and / or frequency tracking, CSI computation, L1 (Layer 1)-RSRP (Reference Signal Received Power) computation, and mobility. Here, the CSI computation is related to CSI acquisition, and the L1-RSRP computation is related to beam management (BM).

[0157] The CSI (Channel State Information) collectively refers to information that can represent the quality of a radio channel (or also referred to as a link) formed between a terminal and an antenna port.

[0158] - To perform one of the purposes of the CSI-RS, a terminal (e.g., a user equipment, UE) receives configuration information related to the CSI from a base station (e.g., a general node B, gNB) through RRC (Radio Resource Control) signaling.

[0159] The configuration information related to the CSI can include at least one of information related to a CSI-IM (Interference Management) resource, information related to a CSI measurement configuration, information related to a CSI resource configuration, information related to a CSI-RS resource, or information related to a CSI reporting configuration.

[0160] i) The information related to the CSI-IM resource can 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 one resource set includes at least one CSI-IM resource. Each CSI-IM resource is identified by a CSI-IM resource ID.

[0161] ii) Information related to CSI resource configuration can be expressed as a CSI-ResourceConfig IE. Information related to CSI resource configuration defines a group including at least one of a NZP (non-zero power) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resource set. In other words, information related to CSI resource configuration can include a CSI-RS resource set list, and the CSI-RS resource set list can include at least one of a 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.

[0162] A parameter indicating the use of a CSI-RS (e.g., a "repetition" parameter related to BM, a "trs-Info" parameter related to tracking) can be configured per NZP CSI-RS resource set.

[0163] iii) Information related to CSI report configuration includes a report configuration type (reportConfigType) parameter indicating a time domain behavior and a report quantity (reportQuantity) parameter indicating a CSI-related quantity of a report. The time domain behavior can be periodic, aperiodic, or semi-persistent.

[0164] - The terminal measures CSI based on the configuration information related to CSI.

[0165] The CSI measurement can include (1) a process in which the terminal receives a CSI-RS and (2) a process of calculating CSI through the received CSI-RS, and detailed descriptions thereof are described later.

[0166] For a CSI-RS, RE (resource element) mapping of a CSI-RS resource in the time domain and the frequency domain is configured by a higher layer parameter CSI-RS-ResourceMapping.

[0167] - The terminal reports the measured CSI to the base station.

[0168] In this case, when the quantity of the CSI-ReportConfig is configured as "none (or no report)", the terminal can omit the report. However, although the quantity is configured as "none (or no report)", the terminal can perform the report to the base station. When the quantity is configured as "none", aperiodic TRS is triggered or repetition is configured. In this case, the report of the terminal can be omitted only when the repetition is configured as "on".

[0169] CSI measurement

[0170] NR systems support more flexible and dynamic CSI measurement and reporting. Here, CSI measurement can include a process of receiving a CSI-RS and obtaining CSI by calculating the received CSI-RS.

[0171] As a time domain behavior of 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.

[0172] The IMR based on CSI-IM of NR has a design similar to that of the CSI-IM of LTE and is configured independently of the ZP CSI-RS resource for PDSCH rate matching. In addition, each port in the NZP CSI-RS-based IMR emulates an interference layer with (desired channel and) precoded NZP CSI-RS. Since this is an intra-cell interference measurement with respect to a multi-user case, it is mainly directed to MU interference.

[0173] The base station transmits a precoded NZP CSI-RS to the terminal in each port of the configured NZP CSI-RS-based IMR.

[0174] The terminal assumes a channel / interference layer and measures the interference of each port in the resource set.

[0175] When there is no PMI and RI feedback for the 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.

[0176] The resource setting and resource setting configuration are described in more detail.

[0177] Resource setting

[0178] Each CSI resource setting "CSI-ResourceConfig" includes a configuration for S≥1 CSI resource sets (given by the higher layer parameter csi-RS-ResourceSetList). The CSI resource setting corresponds to the CSI-RS-resource set list. Here, S denotes the number of configured CSI-RS resource sets. Here, the configuration of S≥1 CSI resource sets includes each CSI resource set and an SS / PBCH block (SSB) resource for L1-RSRP calculation, and each CSI resource set includes a CSI-RS resource (configured with NZP CSI-RS or CSI-IM).

[0179] Each CSI resource setting is located at a DL BWP (Bandwidth Part) identified by the higher layer parameter bwp-id. In addition, all CSI resource settings linked to a CSI report setting have the same DL BWP.

[0180] The time domain behavior of the CSI-RS resources included in a CSI resource setting in the CSI-ResourceConfig IE can be indicated by the higher layer parameter resourceType and can be configured to be 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 numerology of the associated DL BWP as given by bwp-id.

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

[0182] When a UE is configured with multiple CSI-ResourceConfig including the same CSI-IM resource ID, the same time domain behavior is configured for the CSI-ResourceConfig.

[0183] One or more CSI resource settings for channel measurement (CM) and interference measurement (IM) are configured by higher layer signaling as follows.

[0184] - CSI-IM resource for interference measurement

[0185] - NZP CSI-RS resource for interference measurement

[0186] - NZP CSI-RS resource for channel measurement

[0187] In other words, CMR (Channel Measurement Resource) can be NZP CSI-RS for CSI acquisition and IMR (Interference Measurement Resource) can be NZP CSI-RS for CSI-IM and IM.

[0188] In this case, CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.

[0189] In addition, NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multi-users.

[0190] The UE can assume that the CSI-RS resource(s) used for channel measurement and the CSI-IM / NZP CSI-RS resource(s) configured for interference measurement for one CSI report are "QCL-TypeD" per resource.

[0191] Resource setting configuration

[0192] As mentioned, a resource setting can refer to a list of resource sets.

[0193] For aperiodic CSI, each trigger state configured by using the higher layer parameter CSI-AperiodicTriggerState is associated with one or more CSI-ReportConfig, each CSI-ReportConfig is linked to a periodic, semi-persistent or aperiodic resource setting.

[0194] One report setting can be connected to up to 3 resource settings.

[0195] - When one resource setting is configured, the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is about channel measurement for L1-RSRP computation.

[0196] - 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.

[0197] - 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.

[0198] For semi-persistent or periodic CSI, each CSI-ReportConfig is linked to a periodic or semi-persistent resource setting.

[0199] - When one resource setting (given by resourcesForChannelMeasurement) is configured, the resource setting is about channel measurement for L1-RSRP computation.

[0200] - 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.

[0201] CSI computation

[0202] When interference measurement is performed in CSI-IM, each CSI-RS resource for channel measurement is associated with each CSI-IM resource per resource in the order of CSI-RS resources in the corresponding resource set and CSI-IM resources. The number of CSI-RS resources for channel measurement is the same as the number of CSI-IM resources.

[0203] In addition, when interference measurement is performed in NZP CSI-RS, the UE is not expected to be configured with one or more NZP CSI-RS resources in the associated resource set in the resource setting for channel measurement.

[0204] A terminal configured with the higher layer parameter nzp-CSI-RS-ResourcesForInterference is not expected to be configured with 18 or more NZP CSI-RS ports in the NZP CSI-RS resource set.

[0205] For CSI measurement, the terminal assumes the following.

[0206] - Each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer.

[0207] - All interference transmission layers of NZP CSI-RS ports for interference measurement consider the EPRE (Energy Per Resource Element) ratio.

[0208] - 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

[0209] CSI reporting

[0210] For CSI reporting, the time and frequency resources that the UE can use are controlled by the base station.

[0211] CSI (Channel State Information) can include at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS / PBCH Block Resource Indicator (SSBRI), Layer Indicator (LI), Rank Indicator (RI), or L1-RSRP.

[0212] For CQI, PMI, CRI, SSBRI, LI, RI, L1-RSRP, the terminal is configured by 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 list of CSI-ReportConfig, which indicates a set of channel and optional resource IDs for interference. In semiPersistentOnPUSCH-TriggerStateList, one associated CSI-ReportConfig is included in each trigger state.

[0213] In addition, the time domain behavior of CSI reporting supports periodic, semi-persistent, aperiodic.

[0214] i) Perform periodic CSI reporting in short PUCCH, long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured by RRC and refer to the CSI-ReportConfig IE.

[0215] ii) Perform SP (semi-periodic) CSI reporting in short PUCCH, long PUCCH, or PUSCH.

[0216] For SP CSI in short / long PUCCH, the periodicity and slot offset are configured by RRC, and the CSI reporting is activated / deactivated by a separate MAC CE / DCI.

[0217] 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 the 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.

[0218] 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.

[0219] The DCI format 0_1 can include a CSI request field and activate / deactivate a specific configured SP-CSI trigger state. The SP CSI reporting has the same or similar activation / deactivation as the mechanism having data transmission in the SPS PUSCH.

[0220] iii) The aperiodic CSI reporting is performed in the PUSCH and triggered by the DCI. In this case, the information related to the trigger of the aperiodic CSI reporting can be delivered / indicated / configured by the MAC-CE.

[0221] For the AP CSI with the AP CSI-RS, the AP CSI-RS timing is configured by the RRC, and the timing for the AP CSI reporting is dynamically controlled by the DCI.

[0222] In NR, the method of dividing and reporting the CSI in multiple reporting instances applied to the PUCCH-based CSI reporting (e.g., transmitted in the order of RI, WB PMI / CQI, SB PMI / CQI) in LTE is not applied. Instead, in NR, there is a restriction that a specific CSI report is not configured in the short / long PUCCH and a CSI omission rule is defined. In addition, regarding the AP CSI reporting timing, the PUSCH symbol / slot position is dynamically indicated by the DCI. In addition, the candidate slot offset is configured by the RRC. For the CSI reporting, the slot offset (Y) is configured per reporting setting. For the UL-SCH, the slot offset K2 is separately configured.

[0223] Regarding the CSI computation complexity, 2 CSI latency categories (low latency category, high latency category) are defined. The low latency CSI is the WB CSI including the Type-I codebook up to 4 ports or the non-PMI feedback CSI up to 4 ports. The high latency CSI refers to the CSI other than the low latency CSI. For the normal terminal, (Z, Z') is defined in units of OFDM symbols. Here, Z denotes the minimum CSI processing time until the CSI reporting is performed after receiving the aperiodic CSI triggering DCI. In addition, Z' refers to the minimum CSI processing time until the CSI reporting is performed after receiving the CSI-RS for the channel / interference.

[0224] In addition, the terminal reports the number of CSIs that can be simultaneously computed.

[0225] Quasi co-location (QCL)

[0226] The antenna ports are defined such that the channel that transmits a symbol in a transmit antenna port can be inferred from the channel that transmits other symbols in the same antenna port. When a property of the channel that carries a symbol of one antenna port can be inferred from the channel that carries a symbol of another antenna port, it can be said that the 2 antenna ports are in a QC / QCL (Quasi Co-Location or Quasi Co- site) relationship.

[0227] Here, the channel properties include at least one of delay spread, Doppler spread, frequency / Doppler shift, average received power, received timing / average delay, or spatial RX parameter. Here, the spatial Rx parameter means a spatial (Rx) channel property parameter such as an angle of arrival.

[0228] The terminal can be configured in a list of up to M TCI-State configurations in a higher layer parameter PDSCH-Config to decode PDSCH according to a detected PDCCH with expected DCI for the corresponding terminal and a given serving cell. M depends on the UE capability.

[0229] Each TCI-State includes parameters for configuring a quasi co-location relationship between the ports of one or two DL reference signals and the DM-RS of PDSCH.

[0230] The quasi co-location relationship is configured by a higher layer parameter qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS if configured. For both DL RSs, the QCL types are not the same, regardless of whether the reference is the same DL RS or different DL RSs.

[0231] The quasi co-location 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.

[0232] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0233] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0234] - "QCL-TypeC": {Doppler shift, average delay}

[0235] - "QCL-TypeD": {spatial Rx parameter}

[0236] For example, when the target antenna port is a specific NZP CSI-RS, it can be indicated / configured that the corresponding NZP CSI-RS antenna port is quasi-collocated with a specific TRS with respect to QCL-TypeA and is quasi-collocated with a specific SSB with respect to QCL-TypeD. A terminal receiving such an indication / configuration can measure a delay value in the QCL-TypeA TRS by using Doppler reception and apply an Rx beam for receiving the QCL-TypeD SSB to reception of the corresponding NZP CSI-RS.

[0237] The UE can receive an activation command through MAC CE signaling for mapping up to 8 TCI states to the codepoints of the DCI field "transmission configuration indication".

[0238] Operations related to multiple TRPs

[0239] A coordinated multipoint (CoMP) scheme refers to a scheme in which multiple base stations exchange or utilize channel information (e.g., RI / CQI / PMI / LI (layer indicator), etc.) fed back by a terminal and cooperatively transmit to the terminal to effectively control interference, for example, using an X2 interface. According to the scheme used, CoMP can be classified into joint transmission (JT), coordinated scheduling (CS), coordinated beamforming (CB), dynamic point selection (DPS), dynamic point blanking (DPB), etc.

[0240] An M-TRP transmission scheme in which M TRPs transmit data to one terminal can be mainly classified into i) eMBB M-TRP transmission, a scheme for improving a transmission rate, and ii) URLLC M-TRP transmission, a scheme for increasing a reception success rate and reducing latency.

[0241] In addition, with respect to DCI transmission, the M-TRP transmission scheme can be classified into i) M-DCI (multiple DCI) based M-TRP transmission in which each TRP transmits a different DCI, and ii) S-DCI (single DCI) based M-TRP transmission in which one TRP transmits a DCI. For example, for S-DCI based M-TRP transmission, all scheduling information about data transmitted by M TRPs should be delivered to a terminal through one DCI, which can be used in an environment of ideal backhaul (ideal BH) in which dynamic cooperation between two TRPs is possible.

[0242] For TDM-based URLLC M-TRP transmission, Scheme 3 / 4 is being discussed for standardization. Specifically, Scheme 4 refers to a scheme in which one TRP transmits a transport block (TB) in one slot, and it has the effect of improving the probability of data reception by receiving the same TB from multiple TRPs in multiple slots. Meanwhile, Scheme 3 refers to a scheme in which one TRP transmits a TB through a consecutive 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 slot.

[0243] In addition, the UE can recognize PUSCH (or PUCCH) scheduled by DCI received in different control resource sets (CORESETs) (or CORESETs belonging to different CORESET groups) as PUSCH (or PUCCH) transmitted to different TRPs, or can recognize PDSCH (or PDCCH) from different TRPs. In addition, the method described below for UL transmission (e.g., PUSCH / PUCCH) transmitted to different TRPs can be equally applied to UL transmission (e.g., PUSCH / PUCCH) transmitted to different panels belonging to the same TRP.

[0244] In addition, MTRP-URLLC can refer to M TRPs transmitting the same transport block (TB) by using different layers / time / frequency. A UE configured with the MTRP-URLLC transmission scheme receives an indication about multiple TCI states through DCI, and can assume that data received by using the QCL RS of each TCI state is the same TB. On the other hand, MTRP-eMBB can refer to M TRPs transmitting different TBs by using different layers / time / frequency. A UE configured with the MTRP-eMBB transmission scheme receives an indication about multiple TCI states through DCI, and can assume that data received by using the QCL RS of each TCI state is a different TB. In this regard, since the UE classifies and uses RNTI configured for MTRP-URLLC and 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 DCI received by the UE is performed by using RNTI configured for MTRP-URLLC, it can correspond to URLLC transmission, and when CRC masking of the DCI is performed by using RNTI configured for MTRP-eMBB, it can correspond to eMBB transmission.

[0245] Hereinafter, the CORESET group ID described / referred to in the disclosure can refer to index / identification information (e.g., ID, etc.) for CORESETs distinguished per TRP / panel. In addition, the CORESET group can be a group / union of CORESETs distinguished by index / identification information (e.g., ID) / CORESET group ID, etc. for CORESETs distinguished per TRP / panel. In an example, the CORESET group ID can be specific index information defined in the CORESET configuration. In this case, the CORESET group can be configured / indicated / defined by the index defined in the CORESET configuration for each CORESET. Additionally / alternatively, the CORESET group ID can refer to index / identification information / indicator, etc. for distinguishing / identifying between CORESETs configured / associated with each TRP / panel. Hereinafter, the CORESET group ID described / referred to in the disclosure can be expressed by replacing with a specific index / a specific identification information / a specific indicator for distinguishing / identifying between CORESETs configured / associated with each TRP / panel. The CORESET group ID, i.e., the specific index / the specific identification information / the specific indicator for distinguishing / identifying between CORESETs configured / associated with each TRP / panel, can 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 can be configured / indicated so that PDCCH detection is performed per TRP / panel in units of the corresponding CORESET group, i.e., per TRP / panel belonging to the same CORESET group. Additionally / alternatively, it can be configured / indicated so 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 in units of the corresponding CORESET group, i.e., per TRP / panel belonging to the same CORESET group. Additionally / alternatively, HARQ A / N (processing / retransmission) for PDSCH / PUSCH, etc. scheduled per TRP / panel can be managed per the corresponding CORESET group, i.e., per TRP / panel belonging to the same CORESET group.

[0246] For example, a higher layer parameter ControlResourceSet information element (IE) is used to configure a time / frequency control resource set (CORESET). In an example, a control resource set (CORESET) can be related to detection and reception of downlink control information. The ControlResourceSet IE can include an ID related to the CORESET (e.g., controlResourceSetID) / an index of a CORESET pool used for the CORESET (e.g., CORESETPoolIndex) / a 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) can be configured as 0 or 1. In description, a CORESET group can correspond to a CORESET pool, and a CORESET group ID can correspond to a CORESET pool index (e.g., CORESETPoolIndex).

[0247] 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 resource, and the TPs transmit data using different DMRSs (demodulation reference signals) between the TPs through different layers (i.e., through different DMRS ports).

[0248] The TPs deliver data scheduling information to a terminal receiving the NCJT through DCI. Here, a scheme in which each TP participating in the NCJT delivers scheduling information about data transmitted by itself through DCI is referred to as "NCJT based on multiple DCIs". Since each of the N TPs participating in the NCJT transmission transmits a DL grant DCI and a PDSCH to the UE, the UE receives N DCIs and N PDSCHs from the N TPs. Meanwhile, a scheme in which one representative TP delivers scheduling information about data transmitted by itself and data transmitted by different TPs (i.e., TPs participating in the NCJT) through one DCI is referred to as "NCJT based on a single DCI". Here, the N TPs transmit one PDSCH, but each TP transmits only some of the multiple layers included in the one PDSCH. For example, when 4 layers of data are transmitted, TP 1 can transmit 2 layers to the UE, and TP 2 can transmit the remaining 2 layers to the UE.

[0249] Hereinafter, partially overlapping NCJT will be described.

[0250] In addition, the NCJT can be classified into a full overlap NCJT in which time-frequency resources transmitted by each TP are fully overlapped and a partial overlap NCJT in which only some time-frequency resources are overlapped. In other words, for the partial overlap NCJT, data of both TP 1 and TP 2 is transmitted in some time-frequency resources, and data of only one of TP 1 or TP 2 is transmitted in the remaining time-frequency resources.

[0251] Hereinafter, a method for improving reliability in a multi-TRP will be described.

[0252] As a transmission and reception method for improving reliability using transmission in a plurality of TRPs, the following two methods can be considered.

[0253] Figure 7 A method of multi-TRP transmission in a wireless communication system to which the disclosure can be applied is illustrated.

[0254] Reference Figure 7 (a) shows a case in which layer groups transmitting the same codeword (CW) / transport block (TB) correspond to different TRPs. Here, the layer group can refer to a predetermined layer set including one or more layers. In this case, there is an advantage that the amount of transmission resources increases due to the number of layers, so that a robust channel coding with a low coding rate can be used for the TB, and additionally, because the plurality of TRPs have different channels, it can be expected to improve the reliability of the received signal based on diversity gain.

[0255] Reference Figure 7 (b) shows an example of transmitting different CWs through layer groups corresponding to different TRPs. Here, it can be assumed that TBs corresponding to CW#1 and CW#2 in the figure are the same as each other. In other words, CW #1 and CW #2 refer to the same TB being transformed into different CWs by different TRPs through channel coding, etc., respectively. Thus, it can be seen as an example of repeatedly transmitting the same TB. In Figure 7 In the case of (b), compared to Figure 7 (a), there is a disadvantage that the coding rate corresponding to the TB is higher. However, there is an advantage that the coding rate can be adjusted by indicating different RV (redundancy version) values, or the modulation order of each CW generated from the same TB can be adjusted according to the channel environment.

[0256] According to the above Figure 7 (a) and Figure 7(b) The method shown can improve the probability of data reception of the terminal because the same TB is repeatedly transmitted through different layer groups, and each layer group is transmitted by a different TRP / panel. It is called an M-TRP URLLC transmission method based on SDM (Space Division Multiplexing). Layers belonging to different layer groups are transmitted through DMRS ports belonging to different DMRS CDM groups, respectively.

[0257] In addition, the above description related to multiple TRPs is described based on an SDM (Space Division Multiplexing) method using different layers, but it can be naturally extended and applied to an FDM (Frequency Division Multiplexing) method based on different frequency domain resources (e.g., RB / PRB (set), etc.) and / or a TDM (Time Division Multiplexing) method based on different time domain resources (e.g., slot, symbol, sub-symbol, etc.).

[0258] Method for transmitting and receiving channel state information

[0259] According to the CSI (Channel State Information) framework currently defined in Rel-15 / 16 standards, a terminal can not be able to acquire / report joint CSI of CSI-RS resources transmitted from different TRPs / panels. For example, when assuming TRP 1 / 2, the terminal can acquire / report CSI (e.g., CRI / RI / PMI / CQI, etc.) for each of TRP 1 and TRP 2, but can not acquire / report CSI (e.g., CRI / RI / PMI / CQI, etc.) suitable for multi-TRP transmission by considering TRP 1 / 2 together. Therefore, in Rel-16, an operation that can support multi-TRP transmission (e.g., for NCJT / URLLC) is newly introduced, but there is a disadvantage that a random parameter should be applied to link adaptation because a base station does not know the best CSI for performing multi-TRP transmission. If a terminal can acquire / report CSI suitable for multi-TRP transmission by considering multi-TRP transmission (e.g., for NCJT / URLLC), system performance can be improved by performing more appropriate link adaptation when performing multi-TRP transmission.

[0260] In the disclosure, a method in which a terminal can acquire / report CSI suitable for multi-TRP transmission by considering multi-TRP transmission (e.g., for NCJT / URLLC) is proposed.

[0261] Hereinafter, in the disclosure, for convenience of description, it is assumed that 2 TRPs (e.g., TRP 1 / TRP 2) operate. However, such an assumption does not limit the technical scope of the disclosure.

[0262] The description of the TRP in the disclosure is for convenience of description, which can be obviously interpreted as a term such as panel / beam, etc.

[0263] In the disclosure, L1 signaling can refer to dynamic signaling based on DCI between a base station and a terminal, and L2 signaling can refer to higher layer signaling based on RRC / MAC CE (Control Element) between the base station and the terminal.

[0264] 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 Table 6 below. Hereinafter, for convenience of description, the "CSI-ReportConfig" can be referred to as a reporting setting.

[0265] [Table 6]

[0266]

[0267] Reference Figure 6 One reporting setting can include up to 3 "CSI-ResourceConfig"s. For convenience, the "CSI-ResourceConfig" can be referred to as a resource setting. According to the time domain behavior of the reporting setting and the number of resource settings configured in the reporting setting, the use of each resource setting is defined in TS 38.214, as shown in Table 7 below.

[0268] [Table 7]

[0269]

[0270] As described above, one resource setting for channel measurement (CM) can be configured for aperiodic (AP) CSI. In addition, one resource setting for CM can be configured 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 1. For AP CSI resource settings, multiple CSI-RS resource sets can be configured, but when a trigger state is configured, one of the multiple resource sets is selected for each reporting setting.

[0271] As described above, in the current standard, one resource setting for CM can be configured per reporting setting. Thus, when only one resource setting for CM is configured per reporting setting according to the current standard, a method in which a terminal can acquire and report CSI for multi-TRP transmission by using CSI-RS resources defined in one resource setting for CM and CM and interference measurement (IM) generated between different TRPs are performed for each different TRP is required. For this, a method of configuring resource(s) / resource set(s) for CM for different TRPs and a method of configuring / indicating an IM relationship between resource(s) / resource set(s) corresponding to different TRPs are proposed. For example, different TRPs can be classified based on a CORESET group identifier (ID) (or index) (or a CORESET pool index (CORESET pool index)).

[0272] Hereinafter, in the disclosure, a resource set can refer to a non-zero power (NZP) CSI-RS resource set, or the resource set can refer to a CSI resource set including the NZP CSI-RS resource set and / or a CSI-IM (interference measurement) resource set. In addition, hereinafter, in the disclosure, a resource can refer to an NZP CSI-RS resource, and can also refer to a CSI resource including the NZP CSI-RS resource and / or a CSI-IM resource.

[0273] Proposal 1: Method for configuring terminal with resource(s) corresponding to different TRPs in a single resource set

[0274] Proposal 1-1: A base station can configure resource(s) corresponding to different TRPs in a single resource set to a terminal. Here, the resource set can be a resource set configured in a resource setting for channel measurement in a reporting setting.

[0275] The base station can perform indication / configuration of such a resource set as a resource set to be used 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 (e.g., N, N is a natural number) should be reported through the corresponding resource set, or 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 (e.g., M >= N, M is a natural number) corresponding to the resources of the corresponding resource set, or 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 the M resource groups for the calculation / acquisition / reporting of N CSI sets. And, the N resource groups and the N CSI sets can have a one-to-one correspondence, and for this, each CSI set can correspond to a resource group to which the resources for CM belong.

[0276] The terminal can report information on the selected resource group (i.e., CSI) to the base station. Here, for N selected resource groups, when a specific CSI set (e.g., j-th CSI set) corresponding to a specific group (e.g., i-th resource group) is calculated / acquired / reported, the resources in the specific group (e.g., i-th resource group) can be used for CM. And, the resources in (N-1) groups other than the specific group (e.g., i-th resource group) applied to CM can be used for IM of the specific CSI set (e.g., j-th CSI set).

[0277] In the above proposal, "one or more resources corresponding to different TRPs are configured for the terminal in a resource set" can be interpreted as resources corresponding to different TCI states are configured for the terminal in a resource set. In addition, this can mean that the resources in the same resource set have CM / IM relationships with each other in CSI calculation.

[0278] Hereinafter, CSI calculation for multi-TRP transmission is described.

[0279] Figure 8 FIG. illustrates an interference signal of a terminal when multiple TRPs are transmitted in a wireless communication system to which the disclosure can be applied.

[0280] In the above proposal, "CSI calculation for multi-TRP transmission" can refer to the following CM and IM methods.

[0281] Based on Figure 8 , the received signal of the terminal can be expressed as the following equation.

[0282] [Equation 3]

[0283]

[0284] In Equation 3, y Nrx×1 may refer to a received signal of the terminal, H 1 Nrx×N1,tx may refer to a channel of TRP 1, W 1 N1,tx×N1,ly may refer to a precoding matrix (PM) of TRP 1, x 1 N1,ly×1 may refer to a transmission signal of TRP 1, H 2 Nrx×N2,tx may refer to a channel of TRP 2, W 2 N2,tx×N2,ly may refer to a PM of TRP 2, x 2 N2,ly ×1 may refer to a transmission signal of TRP 2, H 1,intf Nrx×N1,intfmay refer to an interference channel for a multi-user (MU) signal of TRP 1, x 1,intf N1,intf×1 may refer to an interference signal for a MU signal of TRP 1. H 2,intf Nrx×N2,intf may refer to an interference channel for a MU signal of TRP 2, x 2,intf N2,intf×1 may refer to an interference signal for a MU signal of TRP 2, I Nrx×1 may refer to an overlapping interference signal from inter-cell ( / TRP), and n Nrx×1 may refer to noise of a terminal.

[0285] In Equation 3, N rx may refer to a number of reception (antenna) ports of a terminal, N 1,tx may refer to a number of transmission (antenna) ports of TRP 1, N 1,ly may refer to a number of transmission layers ( / ranks) of TRP 1, N 2,tx may refer to a number of transmission (antenna) ports of TRP 2, N 2,ly may refer to a number of transmission layers ( / ranks) of TRP 2, N 1,intf may refer to a number of interference layers ( / ranks) for a MU signal of TRP 1, N 2,intf may refer to a number of interference layers ( / ranks) for a MU signal of TRP 2.

[0286] According to the current standard, a terminal can estimate a channel of TRP 1 by using a CSI-RS transmitted by TRP 1, and measure / compute a CSI (e.g., CRI / RI / PMI / CQI / LI (layer indicator), etc.) for TRP 1 to perform feedback to a base station. Here, since the base station configures a NZP CSI-RS for CSI-IM and IM to the terminal for more accurate CSI computation / acquisition / reporting, the terminal can measure an effective interference channel caused by a MU signal of TRP 1, an effective interference channel caused by a MU signal of TRP 2, an overlapping interference signal from inter-cell ( / TRP), etc. Based on the size of the channel of TRP 1, the interference channel caused by a PM and a MU signal of TRP 1, the interference channel caused by a MU signal of TRP 2, the overlapping interference signal from inter-cell ( / TRP), and noise, the terminal can measure a SINR. Based on the measured SINR, a CSI (e.g., CRI / RI / PMI / CQI / LI, etc.) can be computed / acquired, and the corresponding CSI can be fed back to the base station.

[0287] Meanwhile, in such a process, when the terminal performs multi-TRP transmission (e.g., for NCJT) while calculating the CSI of TRP 1, the terminal can 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 can be generated by the effect of the interference signal generated between different TRPs, which is not reflected on the CSI calculation. In addition, it can degrade the system performance, such as an increase in the error rate of the received signal / reduction in the amount of transmission, etc. As a method that can compensate for such a shortcoming, "CSI calculation for multi-TRP transmission" in the present disclosure can refer to the following operations.

[0288] 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 of the two CSI-RSs, 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 calculate / acquire W 1 Nrx ×N1,tx , H 2 Nrx ×N2,tx , H 1,intf Nrx ×N1,intf ,H 2,intf Nrx ×N2,intf ,I Nrx ×1 , etc. based on the estimated values) and W 1 N1,tx ×N1,ly and W 2 N2,tx ×N2,lycombination, which can maximize the received SINR. Also, 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 on the CSI (e.g., CQI, etc.) calculation. In addition, in the above process, the terminal can perform a joint search on various beam combinations of different TRPs (e.g., by the 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 that a more accurate CQI can be fed back. In addition, when calculating the CSI, the covariance matrix value generated by using the estimated channel value can be used for the SINR measurement. Its detailed method is described in the following method of "SINR calculation considering multi-TRP transmission".

[0289] An example of a method for a base station to indicate / configure a terminal of a resource set to be used for CSI calculation for multi-TRP transmission is as follows. The following method can correspond to an example of L1 / L2 signaling for performing the proposed operation. However, it is obvious that the proposal according to the present disclosure is not limited to the following method.

[0290] - 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 (RGs) in the resource set can correspond to an example of the parameter. Here, when the value of M is configured to be 2 or more, the terminal can perform the CSI calculation for the proposed multi-TRP transmission described above. Alternatively, after assuming a fixed value of M (i.e., M can be predefined), a parameter in the form of a flag indicating whether to perform the operation (i.e., CSI calculation for multi-TRP transmission) can be defined.

[0291] -A2: The operation can be configured through a specific parameter in the report setting. The parameter (e.g., reportQuantity) configuring the CSI entry can correspond to an example of the parameter. Here, when the CSI entry for the multi-TRP transmission is included in the parameter (e.g., index / assumption 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 the 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.

[0292] Hereinafter, the definition of the CSI set is described.

[0293] The CSI set can be defined as including the value (or set / information) of one or more CSI entries of CRI / RI / PMI / L1 / CQI / L1-SINR / L1-RSRP.

[0294] Figure 9 FIG. illustrates a CSI set and a resource group in a resource set according to an embodiment of the disclosure.

[0295] Figure 9 An example representing a relationship with respect to N (e.g., 2) CSI sets and M (e.g., 3) resource groups configured in a resource set.

[0296] Figure 9 An example representing that N and M are configured as 2 and 3, respectively. In addition, it represents an example in which the resource for CM in CSI #1 (first CSI set) is included in resource group (RG) #1 and the resource for CM in CSI #2 (second CSI set) is included in resource group (RG) #2. The terminal can calculate the CSI of two CSI sets using two resources included in different RG combinations.

[0297] For example, the terminal can assume a multi-TRP transmission based on TRP #1 / #2. In addition, the terminal can assume one of the resources in RG #1 as a resource for CM for CSI calculation of the first CSI set. In addition, the terminal can assume one of the resources in RG #2 as a resource for CM for CSI calculation of the second CSI set. Here, the resource for CM in each CSI set can be used as a resource for IM in the other CSI set. For example, the resource for CM in the resource of RG #1 for CSI calculation of the first CSI set can be used as a resource for IM in the second CSI set, and vice versa.

[0298] This operation can be performed on combinations of M (e.g., 3) and N (e.g., 2) TRPs (in... Figure 9 In the example, there are 3 TRP combinations) and K1 (e.g., 3) × K2 (e.g., 3) resource combinations (in Figure 9 In the example of 9 resource combinations, a total of 27 resource combinations are used to perform CSI calculations to find TRP combinations and resource combinations that are more suitable for multi-TRP transmission. Here, K1 and K2 can represent the total number of resources in the RG that include resources used for CMs in the first CSI set and the total number of resources in the RG that include resources used for CMs in the second CSI set, respectively.

[0299] However, when the terminal is required to consider all TRP combinations and all resource combinations as in the example, the complexity of the terminal used for CSI calculation may become too high. To mitigate this drawback, the base station can instruct / configure the terminal via L1 / L2 signaling, and / or can apply specific rules between the base station and the terminal in a fixed manner, allowing the terminal to consider only one or more specific TRPs and / or one or more specific TRP combinations and / or one or more specific resource combinations in CSI calculation. For example, a resource set may include M (M is a natural number) CSI-RS resource groups (where each CSI-RS resource group may correspond to a separate TRP), and N CSI-RS resource groups can be determined from the M CSI-RS resource groups. N CSI sets can be generated based on the combinations 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 this disclosure (e.g., a one-to-one correspondence), and although not specifically mentioned in this disclosure, the description of each CSI set can be interpreted as a description of each CSI-RS resource group (or each CSI-RS resource pair). Furthermore, in this case, 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)th CSI-RS resource group can be used for channel measurements, and the CSI-RS resources in the remaining CSI-RS resource groups, excluding the nth CSI-RS resource group, can be used for interference measurements.

[0300] Down Figure 10 This represents an example of applying specific rules between base stations and terminals so that only combinations of specific resources will be considered in CSI calculations.

[0301] Figure 10 The illustration shows resource groups in a CSI set and resource set according to an embodiment of the present disclosure.

[0302] Figure 10It is illustrated that the resources in different RGs can be one-to-one only in ascending (or descending) order. In Figure 10 In this case, the terminal can assume a multi-TRP transmission based on TRP #1 / #2. In addition, the terminal can assume one of the resources in RG #1 as a resource of CM for CSI computation of the first CSI set. In addition, the terminal can assume a resource in RG #2 in the same order (or index) as the resource in RG #1 as a resource of CM for CSI computation of the second CSI set. For example, if the terminal uses resource #2 of the resources in RG #1 as a resource of CM for CSI computation of the first CSI set, it can use resource #5 of the resources in RG #2 as a resource of CM for CSI computation of the second CSI set.

[0303] Here, the resource for CM in each CSI set can be used as a resource for IM in the other CSI set. For example, the resource of CM of the resource in RG #1 for CSI computation of the first CSI set can be used as a resource for IM in the second CSI set, and vice versa.

[0304] For operations such as this example, CSI computation can be performed only for a total of 9 resource combinations including 3 TRP combinations and 3 resource combinations, and thus the amount of computation of the terminal can be significantly reduced.

[0305] Hereinafter, another definition of the CSI set is described.

[0306] Figure 9 and Figure 10 The example of and illustrates a case in which the same CSI entries (e.g., CRI / RI / PMI / LI / CQI, etc.) are included in each CSI set. On the other hand, the CSI entries included in each CSI set can be defined differently. Also / Or, the common CSI entries can be defined separately for different CSI sets.

[0307] Figure 11 and Figure 12 FIG. illustrates a resource group in a CSI set and a resource set according to an embodiment of the disclosure.

[0308] Figure 11 represents an example in which the CSI entries included in each CSI set are defined differently, and Figure 12 represents an example in which the common CSI entries are defined for different CSI sets. In Figure 11 In the example of and, CRI / RI / CQI included in CSI #1 can be interpreted as a value commonly applied to CSI #1 / CSI #2. Alternatively, CRI / RI / CQI included in CSI #1 can be defined separately from CRI / RI / CQI included in CSI #2. Figure 12CSI set (e.g., CSI #0) commonly applied in the example of FIG. 1. For the CSI entries that can be included in the CSI set, the following can be applied together. The following method illustrates proposed L1 / L2 signaling for performing differently defining CSI entries included in each CSI set and / or defining common CSI entries, but is not limited to the following method.

[0309] - CRI: For different CSI sets, different CRIs can be reported respectively. In this case, different CRIs can indicate CRIs included in different resource groups (RGs).

[0310] Alternatively, only one CRI can be reported for different CSI sets. In addition, a combination of resources included in different RGs can be reported based on the corresponding CRI value. In this case, the corresponding CRI value can mean the order (or index) of the resources in each RG. In addition, the bits for CRI reporting can be defined based on the number of resources included in a specific resource group (RG). According to the current standard, the number of bits is determined based on the number of resources configured in the resource set, but according to the proposal, there is an advantage that the number of bits for CRI reporting can be saved.

[0311] As an example of the method, when the value indicated by the CRI is j, each jth resource in the selected RG configured for the CSI set can be selected. Alternatively, the corresponding CRI value can indicate the order (or index) indicating a specific resource, and another resource can be determined based on the index information of the specific resource and information on the combination of the selected RGs configured for the CSI set. 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 ith resource in the other RG can be selected based on the order in the RG. A detailed description of the information on the combination of the selected RGs configured for the CSI set is described later.

[0312] - RI: For different CSI sets, different RIs can be reported. Alternatively, only one RI can be reported for different CSI sets, and in this case, both CSI sets can assume one RI reported as above. Therefore, when only one RI is reported, the degree of freedom for RI selection becomes low, but the feedback overhead for RI reporting can be reduced.

[0313] 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., a differential value compared to the RI of the first CSI set). In this case, the feedback overhead for RI reporting can be reduced.

[0314] In the above-described method, only specific RI combinations can be limited and defined in the CSI report. For example, the terminal can report only the RI combinations for each CSI set such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, 4:4.

[0315] Alternatively, different RIs can be reported by a value representing (indicating) a combination of different RI values. For example, regarding the RI combinations such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, 4:4, 10 states are assumed. In this case, the terminal can report different RI values for each CSI set by reporting a state value corresponding to a specific RI combination.

[0316] - Transmission of 2 codewords (CWs): When the sum of the 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, the CQI reporting for different CWs is described in detail in the following CQI section.

[0317] - PMI: For different CSI sets, different independent PMI values can be reported based on the PM (Precoding Matrix) defined in the standard.

[0318] 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 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 a differential value 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 method can assume that independent PMs are applied to different TRPs. This example can assume that independent PMs are applied to each resource corresponding to different CSI sets.

[0319] - CQI: Different independent CQI values can be reported for different CSI sets. Here, the SINR assumption for each CQI can be different. For example, for CSI #1, it can 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 can represent the signal power of TRP 1 channel and the signal power of TRP 2 channel, respectively. 1,Ly1 and I 2,Ly2 can represent the inter-layer interference signal power of TRP 1 channel and the inter-layer interference signal power of TRP 2 channel, respectively. 1,NCJT2 and I 2,NCJT1 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 can represent the interference signal power of MU channel of TRP 1 to TRP 1 and the interference signal power of MU channel of TRP 2 to TRP 1, respectively. 1,MU1 and I 2,MU1 can represent the interference signal power of MU channel of TRP 1 to TRP 2 and the interference signal power of MU channel of TRP 2 to TRP 2, respectively. intf can represent the overlapping interference signal power from inter-cell ( / TRP). N can represent the size of noise.

[0320] Meanwhile, when the base station transmits signals from different TPRs at the same time (e.g., for NCJT), the reception 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 the actual multi-TRP transmission (e.g., for NCJT). Therefore, the base station can indicate / configure the terminal to report a (single) CQI considering multi-TRP transmission (e.g., for NCJT) through L1 / L2 signaling, or 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.

[0321] - The relationship of the transmission layer of PDSCH / (one or more) antenna ports for PDSCH (DMRS) / (one or more) antenna ports for CSI-RS / precoder in CQI calculation is described:

[0322] 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 formula 4.

[0323] [Formula 4]

[0324]

[0325] x(i)=[x (0) (i)...x (v-1) (i)] Tis a 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 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 reporting CQI is set to “cri-RI-CQI”, W(i) is the precoding matrix corresponding to the process described in clause 5.2.1.4.2 of TS 38.214. 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 the reported i1 according to the process described in clause 5.2.1.4.2 of TS 38.214. The corresponding PDSCH signal transmitted in the antenna ports [3000,..., 3000+P-1] can have the same ratio of PDSCH EPRE (Energy per Resource Element) to CSI-RS EPRE as given in clause 5.2.2.3.1 of TS 38.214.

[0326] In the current standard, one resource is assumed in CSI calculation, thus, with one RI / PMI. Therefore, in the CQI calculation defined in the standard, only one RI and PM is considered in the relationship of the transmission layers of PDSCH / antenna port(s) for PDSCH (DMRS) / antenna port(s) for CSI-RS / precoder. However, in the CSI calculation considering multi-TRP transmission, it can have different RI / PMI values for each of the different CSI-RS resources corresponding to different CSI sets. Therefore, in this case, the relationship between the CSI-RS ports / RI / precoder corresponding to different resources corresponding to different CSI sets and the transmission layers of PDSCH / antenna ports for PDSCH (DMRS) should be defined.

[0327] - Method of reporting 1 CQI for 1 CW transmission

[0328] For example, when the sum of RIs corresponding to different CSI sets is equal to or less than 4, 1 CQI for 1 CW transmission can be reported. In this case, the CQI can be determined based on the following method.

[0329] 1) For CSI-RS ports and precoders, the order (or index, or order (e.g., ascending or descending)) for CQI computation can be defined based on the order (or index, or order (e.g., ascending or descending)) of the CSI sets. Equation 5 below represents an example of this method.

[0330] [Equation 5]

[0331]

[0332] In Equation 5, y (p) CSI1 (i) and y (p) CSI2 (i) can 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. P CSI1 and P CSI2 may represent the number of CSI-RS ports of the resource corresponding to the first CSI set and the number of CSI-RS ports of the resource corresponding to the second CSI set, respectively. W CSI1 (i) and W CSI2 (i) can represent the PM (e.g., PM selected by the terminal / selected by the rule) corresponding to the first CSI set and the PM (e.g., PM selected by the terminal / selected by the rule) corresponding to the second CSI set, respectively. 0 can represent a matrix in which all elements are configured with 0.

[0333] For the CSI-RS ports defined in Equation 5, it can be assumed that a signal corresponding to a symbol transmitted from the corresponding antenna port in the order in the vector is the same as a signal transmitted from the [1000, …, 1000+v-1] port of the PDSCH. Here, the symbol 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 can be equally applied to the following proposals. For example, in CQI computation, the UE assumes that the PDSCH signal in the antenna port set [1000, …, 1000+v-1] for v layers is equivalent to a signal corresponding to a corresponding symbol transmitted in the antenna port [3000 CSI1 ,...,3000 CSI1 +P CSI1 -1, 3000 CSI2 ,..., 3000 CSI2 +P CSI2 -1]. Here, x(i) = [x (0) (i)...x (v-1) (i)] T is a vector of PDSCH symbols generated by layer mapping.

[0334] 2) For CSI-RS ports and precoders, an order (or index, or sequence, or mapping) for CQI calculation can be defined based on the RI size of the CSI set (e.g., ascending order or descending order). Equation 6 below represents an example of this method.

[0335] [Equation 6]

[0336]

[0337] In Equation 6, y (p) CSIa (i) and y (p) CSIb (i) can represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set, respectively. P CSIa and P CSIb may represent the number of CSI-RS ports of the resource corresponding to the CSIa set and the number of CSI-RS ports of the resource corresponding to the CSIb set, respectively. W CSIa (i) and W CSIb (i) can represent the PM (e.g., PM selected by the terminal / selected by the rule) corresponding to the CSIa set and the PM (e.g., PM selected by the terminal / selected by the rule) corresponding to the CSIb set, respectively. 0 can represent a matrix in which all elements are configured with 0.

[0338] In this equation, for CSIa and CSIb, the order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb . For example, when the first condition is assumed, for RI CSI1 , RI CSI2 = 2, 1, CSIa and CSIb can correspond to CSI1 and CSI2, respectively. At the same time, when the RIs of different CSI sets are the same, the order can be defined based on the method of 1).

[0339] - Method of reporting 2 CQIs for transmission of 2 CWs

[0340] 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 can be reported. In this case, each CQI corresponding to different CWs can be determined based on the following method.

[0341] 1) For CSI-RS ports and precoders, the order (or index, or sequence, or mapping) of CQI calculation can be defined based on the order (or index, or sequence (e.g., ascending or descending)) of CSI sets. Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can correspond to the transmission layers of different LGs (sequentially). For example, the PMs in CSI set 1 can correspond to the transmission layers belonging to LG 1 (sequentially (e.g., in ascending / descending order)), and the PMs in CSI set 2 can correspond to the transmission layers belonging to LG 2 (sequentially (e.g., in ascending / descending order)). Equation 7 below represents an example of this method.

[0342] [Equation 7]

[0343]

[0344] In Equation 7, y (p) CSI1 (i) and y (p) CSI2 (i) can 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. P CSI1 and P CSI2 may represent the number of CSI-RS ports of the resource corresponding to the first CSI set and the number of CSI-RS ports of the resource corresponding to the second CSI set, respectively. W CSI1 (i) and W CSI2 (i) can represent the PM corresponding to the first CSI set (e.g., the PM selected by the terminal / selected by the rule) and the PM corresponding to the second CSI set (e.g., the PM selected by the terminal / selected by the rule), respectively. 0 can represent a matrix in which all elements are configured with 0.

[0345] In Equation 7, v 1 LG1 and v 1 LG2 may represent the first layer index of the first LG and the first layer index of the second LG, respectively.

[0346] In this method, the transmission layers corresponding to different LGs can be defined based on all RI values, and an example can be as follows. For example, for RI = 5 / 6 / 7, v 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, vLG1 = {2, 3, 5}, v LG2 = {0, 1, 4} or v LG2 = {2, 3, 5}, v LG1 = {0, 1, 4}.

[0347] Based on the LG example, when the RI values of different CSI sets are different, LG2 can correspond to the CSI set with a larger RI value. In other words, for all RI values, the LG including the layer corresponding to the CW with a large RI value can correspond to the CSI set with a large RI value.

[0348] Alternatively, when different CSI sets have the same RI value, the CSI sets and LGs can correspond based on a specific order (e.g., ascending / descending order), respectively.

[0349] The reason why the LGs can be classified as described above is as follows. As described in the following standard, based on TS 38.212, when the DMRS port index is indicated to the terminal through the DCI, it can be defined to correspond to the transmission layer in the order of the indicated DMRS port.

[0350] For example), the number of CDM groups without values 1, 2, 3 is referred to as each CDM group {0, {0, 1}, {0, 1, 2} in the case of (one or more) antenna port-4, 5, or 6 bits. The antenna port {p0,...,p v-1} is determined according to the order of (one or more) DMRS port.

[0351] Meanwhile, when multiple TCI states are indicated to the terminal for multi-TRP transmission, each TCI state and DMRS port can be defined in TS 38.214 as follows, so that they can be mapped to each other based on the CDM group including the DMRS port.

[0352] For example), when the UE is not indicated by the DCI including the DCI field "time domain resource assignment" indicating the entry in the pdsch-TimeDomainAllocationList including RepNumR16 in PDSCH-TimeDomainResourceAllocation, and when 2 TCI states in the codepoint 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 port" 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 group.

[0353] According to the above, when a plurality of TCI states are indicated to a terminal for multi-TRP transmission, each TCI state can be mapped to a DMRS port included in a specific CDM group. Also, the DMRS ports are sequentially mapped to transmission layers in the order defined in the standard. Thereby, when 2 CWs are transmitted, the DMRS ports corresponding to different TCI states can correspond to layers corresponding to a specific CW. In other words, a specific CW can be mapped together to different TRPs, not to a specific TRP.

[0354] Table 8 below shows a mapping relationship between each CW / layer / DMRS port / CDM group when 5 layers are transmitted according to the current standard. (DMRS Type 1 is illustrated)

[0355] [Table 8]

[0356]

[0357] 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 a terminal calculates CQI for different CWs, it should be able to reflect the mapping relationship. For example, according to the layer-DMRS port-CDM group mapping relationship in the table, layers 0, 1, 4 can correspond to TRP 1, and layers 2, 3 can correspond to TRP 2. 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 a transmission signal, 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.

[0358] As described in the example of Table 8, layers corresponding to each CW can be classified into layer groups (LGs) based on the layer-DMRS port-CDM group mapping relationship (i.e., based on the CDM group that the layer will correspond to).

[0359] Figure 13 Information about CDM groups and DMRS ports corresponding to each layer based on all RIs according to an embodiment of the disclosure is illustrated.

[0360] 2) For CSI-RS ports and precoders, an order (or index, or sequence, or mapping) for CQI calculation can be defined based on the RI size of the CSI sets (e.g., ascending or descending). Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can correspond to the transmission layers of different LGs (sequentially). For example, the PMs in the CSI set 1 can correspond to the transmission layers belonging to LG 1 (sequentially (e.g., in ascending / descending order)), and the PMs in the CSI set 2 can correspond to the transmission layers belonging to LG 2 (sequentially (e.g., in ascending / descending order)). Equation 8 below represents an example of this method.

[0361] [Equation 8]

[0362]

[0363] In Equation 8, y (p) CSIa (i) and y (p) CSIb (i) can represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set, respectively. P CSIa and P CSIb may represent the number of CSI-RS ports of the resource corresponding to the CSIa set and the number of CSI-RS ports of the resource corresponding to the CSIb set, respectively. W CSIa (i) and W CSIb (i) can represent the PMs (e.g., PMs selected by the terminal / selected by the rule) corresponding to the CSIa set and the PMs (e.g., PMs selected by the terminal / selected by the rule) corresponding to the CSIb set, respectively. 0 can represent a matrix in which all elements are configured with 0.

[0364] In this equation, for CSIa and CSIb, an order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb . For example, when the first condition is assumed, for RI CSI1 , RI CSI2 = 3, 2, CSIa and CSIb can correspond to CSI1 and CSI2, respectively. Meanwhile, when the RIs of different CSI sets are the same, the order can be defined based on the method of 1).

[0365] In Equation 8, v 1 LG1 and v 1 LG2The first layer index of the first LG and the first layer index of the second LG can be represented, respectively.

[0366] In this method, transmission layers corresponding to different LGs can be defined based on all RI values, and examples can be as follows. For example, for RI = 5 / 7 / 8, v 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, v LG1 ={2,3,5}、v LG2 ={0,1,4} or v LG2 ={2,3,5}、v LG1 ={0,1,4}.

[0367] Based on the example of the LG, when the RI values of different CSI sets are different, LG2 can correspond to the CSI set with a larger RI value. In other words, for all RI values, the LG including the layer corresponding to the CW with a large RI value can correspond to the CSI set with a large RI value.

[0368] Alternatively, when different CSI sets have the same RI value, the CSI sets and the LGs can correspond, respectively, based on a specific order (e.g., ascending / descending order).

[0369] - LI (Layer Indicator): Different independent LI values can be reported for different CSI sets. Whether different independent LI values are reported 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 that should 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 assumed to be 2 (i.e., there are 2 CSI sets), the LI value of 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 it is assumed that the RI value corresponding to a specific CSI set is v, the number of bits required to report the LI value of the specific CSI set can be determined based on the number of ports configuring the resources corresponding to the corresponding CSI set. For example, it can be determined such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)). In addition, the reported LI value can represent the strongest layer index corresponding to a specific column of PMs of the PMI corresponding to the corresponding CSI set. Meanwhile, when the maximum number of PTRS ports is configured as 1, one LI value can be reported. Alternatively, the LI value selected for a specific CSI set can be reported, and the LI value fixed to a specific value for the remaining N-1 CSI sets can be reported.

[0370] - 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, it can be determined such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)). 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 the CSI set having a larger CQI, and / or (when the CQIs are the same) as the CSI set having a larger RI value, and / or (when the CQI / RI are the same) 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 PMs of the PMI corresponding to the corresponding CSI set.

[0371] - 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 configured for the resources corresponding to the CSI set including the maximum RI value. For example, such as ceil(log2v) (ceil(x) is the minimum 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 the CSI set having a greater RI value, and / or (when the RIs are the same) 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 the CSI set having a greater signal power / greater SINR. The reported LI value can represent the strongest layer index corresponding to a specific column of PMs corresponding to the PMI of the respective CSI set.

[0372] Meanwhile, when one LI value is reported in the proposal, a variable for reporting whether the LI value is reported corresponding to which of the multiple CSI sets can be defined. For example, a specific CSI set among two CSI sets can be reported by 1-bit information. Alternatively, a rule can be defined such that the reported LI value will correspond to a specific CSI set. For example, when one 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 the RI / PMI to be reported in each CSI set based on the LI value, etc. For example, the RI / PMI, etc. corresponding to the LI value 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.

[0373] For the reported RI / PMI, a mutual pair can be defined, and the reporting method / reporting information amount, etc. of the PMI can be determined based on the paired RI value.

[0374] Hereinafter, a method of defining a resource group in a resource set is described.

[0375] For M resource groups (RGs) in a resource set, each RG can be configured with one or more resources.

[0376] Table 9 shows an NZP-CSI-RS-RESOURCESET information element defining a resource set.

[0377] [Table 9]

[0378]

[0379] As described in Table 9, the resources can be configured in nzp-CSI-RS-Resources. In other words, the 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 a fixed rule of the base station and / or L1 / L2 signaling. For example, according to the above-described “method for a base station to indicate / configure a resource set to be used for CSI calculation for multi-TRP transmission to a terminal”, a terminal receiving the corresponding indication / configuration can classify the resources in the resource set into M RGs.

[0380] The method of classifying the resources configured in nzp-CSI-RS-Resources into M RGs is as follows (for example, A1 / A2).

[0381] -A1: The M*(n)+i-th resource in nzp-CSI-RS-Resources can be included in the i-th RG. (i=0,...,M-1, n=0,1,...)

[0382] -A2: The M*(i)+n-th resource in nzp-CSI-RS-Resources can be included in the i-th RG. (n=0,...,M-1, i=0,1,...)

[0383] Based on the current standard, the maximum number of resources in nzp-CSI-RS-Resources can be configured by a specific parameter. 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 actually be configured can be different according to the reported information or the reporting amount (e.g., the reportQuantity parameter) configured in the reporting setting to which the resource set is connected. For example, when the reporting amount (e.g., the reportQuantity parameter) is configured as one of CRI / RI / CQI reporting (cri-RI-CQI), CRI / RI / i1 (some indices in PMI) reporting (cri-RI-i1), CRI / RI / i1 (some indices 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 up to 8 resources. Such a limitation considers single-TRP transmission, and thus when considering multi-TRP transmission, the maximum number of resources that can be configured per resource set can be defined / configured as 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 a specific parameter(s) (e.g., whether to perform operation / M value / N value, etc.) configured in the resource set and / or a specific parameter(s) (e.g., reporting amount (reportQuantity value)) configured in the reporting setting to which the resource set is connected.

[0384] Hereinafter, a method of reporting combination information of a resource group (RG) selected for CSI set configuration is described.

[0385] In the above proposal, M resource groups configured with one or more resources in one resource set are defined. According to the proposal, N of the M RGs can be selected, and here, the terminal should report to the base station which RG combination to use to calculate / acquire / report CSI.

[0386] Meanwhile, in order to omit the report on such selected RG, the base station can be instructed / configured to calculate / acquire / report CSI for N CSI sets based on the N RGs, or can be defined by a fixed rule. Also, the terminal can not report information on the RG to the base station.

[0387] However, although the same number of RGs as the CSI set is configured, there can be a case where the terminal can determine that the performance of a single TRP transmission considering a specific TRP is superior to that of multi-TRP transmission considering N TRPs. For example, a case where CQI considering a single TRP transmission is higher than that considering multi-TRP transmission can correspond thereto when the total number of ranks is the same / similar. As such, when the number M of RGs configured / included in a resource set is the same as the number N of CSI sets that should be reported and is greater than N, the terminal should report to the base station which RG group is used to report the CSI set. To this end, when N CSI sets are reported, the terminal can report to the base station standard information about N or less RG groups. For such reporting, the following methods can be applied.

[0388] -A1: The terminal can report N or less specific RGs based on a bitmap configured with M bits.

[0389] -A2: A bit field that can indicate Combination(M,N) + Combination(M,N-1) +... +Combination(M,1) RG combinations can be defined, and the terminal can report N or less specific RGs based on a correspondence between the corresponding bit field and a specific RG combination.

[0390] When the number of RGs according to the proposed reporting is less than N, the CSI of N-1 CSI sets (e.g., CRI / RI / PMI / LI / CQI, etc.) can be fixed to a specific value. Alternatively, the size of part 1 / 2 information can be determined based on the number of RGs reported to the base station. Part 1 / 2 information is defined in TS 38.214, 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 completely transmitted before part 2.

[0391] In addition to this proposal, in order to reduce the feedback overhead and complexity of CSI calculation of the terminal, it can also be defined to calculate / acquire / report CSI based on L1 / L2 signaling and / or a fixed rule only for a specific candidate among all RG combination candidates of M RG combinations. Tables 10 to 12 below represent such examples.

[0392] [table 10]

[0393]

[0394] [table 11]

[0395]

[0396] [table 12]

[0397]

[0398] In the examples of Table 10 to Table 12, M and N are assumed to be configured as 3 and 2, respectively. Table 10 represents an example configured to perform CSI computation / acquisition / reporting for all possible RG combinations. On the other hand, Table 11 and Table 12 represent examples configured not to consider a specific RG combination. Table 11 represents an example configured not to perform CSI computation / acquisition / reporting for single-TRP transmission. Table 12 represents an example configured not to perform CSI computation / acquisition / reporting including TRPs corresponding to RG #2. In other words, Table 12 is an example configured not to compute / acquire / report CSI including TRPs corresponding to a specific RG. (In other words, it can be configured to compute / acquire / report CSI including only TRPs corresponding to a specific RG.) The base station can configure the operation of the terminal through a specific parameter in each report setting.

[0399] When configured to compute / acquire / report CSI based on the proposal only for a specific candidate among all RG combination candidates, 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 the total of 6 candidates should be included in the CSI payload. However, in the example of Table 11 or Table 12, CSI can be computed / acquired / reported only for 3 candidates among the 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 the specific payload (e.g., for zero padding).

[0400] And / or, when it is configured to compute / acquire / report CSI based on the proposal only for a specific candidate among all RG combination candidates, the number of CPUs (CSI processing units) for CSI reporting can be determined based on the "specific candidate". For example, for the example of Table 10, the number of CPUs for CSI computation / acquisition / reporting for the total of 6 candidates should be considered. However, in the example of Table 11 or Table 12, CSI can be computed / acquired / reported only for 3 candidates among the total of 6 candidates, so it can be defined to consider the number of CPUs for only 3 candidates.

[0401] Meanwhile, in addition to the proposal, it can be defined that it is necessary to calculate / acquire / report the CSI for a specific candidate among all RG combination candidates possible with M RGs based on L1 / L2 signaling and / or fixed rule. For example, the terminal can be defined to calculate / acquire / report the CSI related to single-TRP transmission. In the example of Table 10, the terminal can calculate / acquire the CSI based on the resources in RG#1 / #2 / #3 to calculate / acquire / report the CSI for single-TRP transmission, and can report to the base station the CSI calculated / acquired based on specific resources in a specific RG that is most optimal when assuming single-TRP transmission (e.g., highest SINR / CQI / RI / throughput, etc.). The CSI for single-TRP transmission can be always reported regardless of the CSI for multi-TRP transmission, and in addition, the CSI for multi-TRP transmission (e.g., for NCJT / URLLC, etc.) can be reported together. In other words, the example of Table 10 can represent a case in which the CSI for single-TRP and the CSI for multi-TRP are always reported together to the base station. As described above, when the terminal always reports the CSI for single-TRP regardless of the CSI for multi-TRP, when the base station can not be able to perform multi-TRP transmission (although multi-TRP transmission is better for a specific terminal) for any reason, the base station can know the CSI for single-TRP that is suitable for the specific terminal. Thus, there can be an advantage that scheduling suitable for a specific terminal can be performed.

[0402] Also / Or, when it is necessary to calculate / acquire / report the CSI for a specific candidate based on the proposal and at the same time whether to report the CSI for the specific candidate is variable (selective), a state that can indicate whether to perform reporting 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 the CSI related to single-TRP transmission, and it is defined / configured to report the CSI related to multi-TRP transmission based on the selection of the terminal, a state related to "not report" can be defined in the CSI payload for reporting the RG combination related to multi-TRP transmission. In the example of Table 10, there are three RG combinations {#1, #2}, {#1, #3}, {#2, #3} related to multi-TRP transmission, and due to the addition of the state of "not report" thereto, the CSI payload can be configured with 2 bits for a total of 4 states.

[0403] Also / Or, the state related to reporting / partial reporting (e.g., for CSI omission) / not reporting can be defined by adding or replacing the state for "not reporting".

[0404] The relationship between the resource group in the resource set and the CSI-IM / NZP CSI-RS configured in the resource setting for IM is described.

[0405] Figure 14 FIG. 1 is a diagram illustrating a mapping relationship between resources for channel measurement and resources for interference measurement in a wireless communication system to which the disclosure is applied.

[0406] Referring to Figure 14 (a), NZP CSI-RS resources for resource settings of CM and CSI-IM resources for IM are mapped to each other in a resource-wise unit in CSI computation as defined in TS 38.214. For example, a first NZP CSI-RS resource can be applied together with a first CSI-IM resource in CSI computation, and a second NZP CSI-RS resource can be applied together with a second CSI-IM resource in CSI computation.

[0407] Referring to Figure 14 (b), when NZP CSI-RS resources for IM are configured in a reporting setting, only one of NZP CSI-RS resources for resource settings of CM and CSI-IM resources for IM can be configured. And, in CSI computation, the NZP CSI-RS resources, the CSI-IM resources, and the NZP CSI-RS resources for IM can be applied together.

[0408] Meanwhile, when a plurality of resource groups in a resource set are configured according to the proposal, the mapping method defined in the current standard can be used as it is for CSI computation. However, in this case, there is a problem that unnecessary resources can be defined to increase RS overhead for defining CSI-IM resources for IM, and NZP CSI-RS resources for IM can not be defined. To compensate for this, when a plurality of resource groups in a resource set are configured, for CSI computation, the relationship between resource groups in the resource set and CSI-IM / NZP CSI-RS configured in resource settings for IM can be defined as follows.

[0409] Figures 15 to 17 FIG. 2 is a diagram illustrating a mapping relationship between resources for channel measurement and resources for interference measurement according to an embodiment of the disclosure.

[0410] - CSI-IM resources configured in resource settings for IM can be mapped to resources in each resource group in a resource-wise unit.

[0411] Referring to Figure 15For example, a first NZP CSI-RS resource in a first resource group (RG) can be applied with a first CSI-IM resource when calculating CSI, and a second NZP CSI-RS resource in a second RG can be applied with a second CSI-IM resource when calculating CSI. Likewise, a second NZP CSI-RS resource in a first resource group (RG) can be applied with a second CSI-IM resource when calculating CSI, and a second NZP CSI-RS resource in a second RG can be applied with a second CSI-IM resource when calculating CSI.

[0412] Alternatively, referring to Figure 16 , a CSI-IM resource can be mapped to a specific resource in a specific resource group (RG) (e.g., RG# 2 in Figure 16 ) in a resource-by-resource unit. In addition to the resources included in a specific resource group (e.g., RG# 1 in Figure 16 ), a resource (e.g., resource#1 of RG#1 in Figure 16 ) mapped to a CSI-IM resource can be mapped to a resource for inter-RG IM assumption (e.g., resource#1 of CSI-IM resource in Figure 16 ) when performing CSI calculation on a specific resource.

[0413] - When NZP CSI-RS resources for IM are configured in a resource setting for IM, only one resource in a resource group can be configured, and when performing CSI calculation, the NZP CSI-RS resource, the CSI-IM resource, and the NZP CSI-RS resource for IM in each resource group can be applied together. For example, referring to Figure 17 , resource#1 in resource group#1, CSI-IM resource#1, and NZP CSI-RS resource#1 for IM can be applied together when performing CSI calculation.

[0414] Hereinafter, a method of configuring different QCL-typeD reference resources is described.

[0415] The above proposal can assume that no QCL-typeD is configured for resources included in different resource groups (RGs), or the same QCL-typeD is configured in a resource-by-resource unit. As described in "Relationship between resource groups in a resource set and CSI-IM / NZP CSI-RS configured in a resource setting for IM", the CSI-IM resource and the NZP CSI-RS resource for IM mapped to the resources in each RG can be equally applied.

[0416] Meanwhile, a case in which different QCL-typeD RSs are configured can be supported by considering a frequency band higher than FR 1. For example, when a terminal can be equipped with multiple panels and simultaneously receive signals by using multiple reception beams, the terminal can receive PDSCH(s) configured with multiple QCL-typeD RSs. In this case, different QCL-typeD RSs need to be configured for resources included in different RGs to acquire / report CSI considering multi-TRP transmission. To this end, the terminal can report a relative UE capability to the base station. The UE capability can be a capability indicating that the terminal can simultaneously receive signals through multiple spatial domain reception filters based on different QCL-typeD RSs. The base station can configure different QCL-typeD RSs for resources corresponding to different RGs for CSI calculation considering multi-TRP transmission based on the UE capability for the corresponding terminal. When different QCL-typeD RSs are configured for resources corresponding to different RGs, the terminal can receive the resources through multiple spatial domain reception filters (i.e., through multiple panels) based on different QCL-typeD RSs. This can be equally applied to CSI-IM resources for IM and NZP CSI-RS resources, 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". In addition, resources corresponding to different RGs are configured with different QCL-typeD RSs but can be defined to be transmitted in the same OFDM symbol. In addition, resources corresponding to different RGs can have a one-to-one correspondence between different RGs.

[0417] Figure 18 FIG. 9 illustrates an operation of receiving a CSI-RS configured with different multiple QCL typeD reference resources according to an embodiment of the disclosure.

[0418] As in Equation 9 below, an operation of receiving a CSI-RS through multiple spatial domain reception filters (i.e., through multiple panels) based on different QCL-typeD RSs can be expressed.

[0419] [Equation 9]

[0420]

[0421] In Equation 9, y 2 ×1 may express a vector of a received signal, and n 2 ×1 may express a vector of noise. x1may express a transmission signal of a CSI-RS port of TRP 1, and x2may express a transmission signal of a CSI-RS port of TRP 2. h i,p,jThis 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 example above, the receiving beams of panel 1 and panel 2 can be different. This can be interpreted as different QCL-Type D RSs being configured for different CSI-RS resources (for CM) considered in CSI calculations that take into account multiple TRP transmissions. In other words, assume that the QCL-Type D RS of resource #a included in RG#1 corresponding to TRP 1 is configured as A, and the QCL-Type D RS of resource #b included in RG#2 corresponding to TRP 2 is configured as B. Furthermore, assume that the two resources correspond to different CSI sets. In this case, the terminal can simultaneously receive CSI-RS in a specific resource using different receiving beams. And, the terminal can estimate h using the received signal from each receiving port of the terminal via the CSI-RS transmitted by resource #a. 1,1,1 +h 1,2,1 and h 1,1,2 +h 1,2,2 And by using the received signal from each receive port of the terminal via CSI-RS sent by resource #b, h is estimated. 2,1,1 +h 2,2,1 and h 2,1,2 +h 2,2,2 .

[0422] Equation 9 assumes that the terminal does not classify the receiving antenna ports of different panels. However, the terminal can also receive signals by classifying the receiving antenna ports of different panels. Equation 10 below illustrates an example of the terminal receiving signals by classifying the receiving antenna ports of different panels.

[0423] [Formula 10]

[0424]

[0425] In the example above, assume that the QCL-Type D RS for resource #a in RG#1 corresponding to TRP 1 is configured as A, and the QCL-Type D RS for resource #b in RG#2 corresponding to TRP 2 is configured as B. Also, assume that the two resources correspond to different CSI sets. In this case, the terminal can simultaneously receive CSI-RS in a specific resource using different receive beams. Furthermore, the terminal can estimate h using the CSI-RS transmitted by resource #a and the received signal from each of the terminal's receive ports. 1,1,1 , h 1,2,1 , h 1,1,2 and h 1,2,2, and h is estimated by using the received signal of each receive port of the terminal with the CSI-RS transmitted by resource #b 2,1,1 , h 2,2,1 , h 2,1,2 , h 2,2,2 .

[0426] To apply this method, multiple different QCL-TypeD RSs can be configured for a CSI-RS resource (based on UE capability). When different QCL-TypeD RSs are configured for a CSI-RS resource, the terminal can receive the resource through multiple receive filters (i.e., spatial domain receive filters) based on different QCL-TypeD RSs. Here, for the corresponding terminal, to consider the CSI calculation for multi-TRP transmission, multiple QCL-TypeD RSs configured for resources corresponding to different RGs can be defined to be the same. For example, when the QCL-TypeD RS of resource #a included in RG #1 corresponding to TRP 1 is configured as A and B, the QCL-TypeD 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 resource for IM and the NZP CSI-RS resource mapped to the resource 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" in the method for IM.

[0427] Hereinafter, a CSI processing unit considering CSI for multi-TRP transmission is described.

[0428] In TS 38.214, a CSI processing unit (CPU) representing the number of CSIs that can be simultaneously calculated by a terminal is defined, and the number of CPUs occupied is differently defined according to the reporting quantity configured in the reporting setting (e.g., the parameter reportQuantity). Table 13 below represents a part of the description of the CPU defined in the standard.

[0429] [Table 13]

[0430]

[0431] In addition to the definition of Table 13, when CSI considering multi-TRP transmission is introduced, the complexity of the terminal can increase compared to the existing operation, and thus a new CPU definition for reflecting it can be introduced.

[0432] Table 14 illustrates a method of 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 can correspond to O in the standard description.CPU .

[0433] In Table 14 below, various options are proposed by combinations of A1-1, A1-2, A2-1, A2-2, A3-1, A3-2, B1, B2, but not all options are necessarily used. Only options according to any one of the combinations thereof can be used, or options according to two or more combinations can be selectively used by a specific condition, etc.

[0434] For convenience of description, the "CSI considering multi-TRP transmission" can be referred to as mTRP CSI. Also, the "CSI considering multi-TRP transmission" can be configured to the terminal through reportQuantity of CSI-ReportConfig. The "CSI considering multi-TRP transmission" can be defined to include values of (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc. Also / Or the "CSI considering multi-TRP transmission" can indicate / include a case where beam / RS pair information is configured. Also / Or the "CSI considering multi-TRP transmission" can indicate / include a case where multiple resource groups are configured in a resource set. Also / Or the "CSI considering multi-TRP transmission" can indicate / include a case where multiple CSI sets are configured to be reported. The CSI contrary to the MTRP CSI can be referred to as STRP CSI (i.e., single TRP CSI), which can indicate the CSI defined previously.

[0435] [Table 14]

[0436]

[0437] In Table 14, K S indicates the number of all resources included in one resource set. C(M,2) indicates 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 ' indicates the number of resources included in one RG. In Table 14, for convenience, it is assumed that the number of resources in the RG is the same as K s ' for all RGs, but a case where the number is defined differently can also be considered. Hereinafter, each case is described by referring to Table 14.

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

[0439] A1-2: When calculating specific CRI combinations for different RGs (e.g., combinations with one-to-one correspondence, first-first, second-second,...), and here, performing the 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 specific rules) and performing the operation by independently changing the RI / PMI, etc. in each resource)

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

[0441] A2-2: When calculating specific CRI combinations for different RGs (e.g., combinations with one-to-one correspondence, first-first, second-second,...), but after selecting specific CRI combinations for different RG combinations (e.g., assuming that the CSI of a single TRP can be used for selection), performing the operation by independently changing the RI / PMI, etc. in the selected resources of each RG for different RG combinations (and / or when performing the operation 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 single TRP CSI))

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

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

[0444] B1: When considering the assumption regarding single TRP transmission

[0445] B2: When not considering the assumption regarding single TRP transmission

[0446] In this proposal, for the 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 can be applied without limiting the cases.

[0447] In addition to the proposal, and / or in addition to the existing CPU definition, and / or the following proposal can be considered independently / together.

[0448] - When the CSI for M-TRP is calculated at the same time, the CPU occupation is assumed to be M-CPU. "M-CPU" can mean the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 method.

[0449] - When the sum of the ranks is equal to or greater than a specific value (e.g., 4), the CPU occupation is assumed to be 2. This can mean that it is defined as a double value compared to the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 method and / or is defined as a double value compared to the existing CPU definition. (It can be equally applied in the following proposal.)

[0450] - When the size of the bandwidth (BW) or the size of the sub-band (SB) configured as the CSI report, etc. is equal to or greater than a specific number, the CPU occupation is assumed to be 2. This can 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 method and / or is defined as a double value compared to the existing CPU definition.

[0451] - In the BM report, the CPU occupancy is assumed as the number of TRPs. The "BM report" can mean a case where the reportQuantity of CSI-ReportConfig is configured as a value including cri-RSRP / ssb-Index-RSRP / cri-SINR / ssb-Index-SINR, etc. The "number of TRPs" can correspond to the number of resource groups in the resource set. Alternatively, each TRP can be classified according to information (e.g., index, identifier (ID)) on the CORESET group (or CORESET pool), and the "number of TRPs" can 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 for CM in N CPU calculations, the terminal can recognize it as a CSI report for mTRP (i.e., multiple TRP) CSI feedback.

[0453] Hereinafter, a priority rule for CSI reporting is described.

[0454] TS 38.214 defines a priority rule for CSI reporting to determine which CSI to feedback when channels / resources for CSI feedback overlap / conflict. The following Table 15 illustrates a part of the description on the priority rule defined in the standard.

[0455] [Table 15]

[0456]

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

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

[0459] A1. The MTRP CSI can be defined to have a higher priority than the STRP CSI. The higher priority can mean that it can be preferentially transmitted when a channel / resource for CSI feedback overlaps / conflicts. In addition, the CSI for BM (beam management) (e.g., for L1-RSRP / L1-SINR) can be defined to have the highest priority regardless of the 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 to have the highest priority is that when BM between the base station and the terminal fails, communication can not be possible due to the deterioration of the signal quality. Therefore, BM can be smoothly performed by defining the CSI for BM to have the highest priority. Meanwhile, the reason why the MTRP CSI should be defined to have a higher priority than the STRP CSI is as follows. The base station should transmit CSI-RSs corresponding to different TRPs to the terminal to calculate the MTRP CSI. In addition, the terminal should calculate (joint) CSI by using the corresponding RSs, and thus can require more complexity / battery compared to the STRP CSI. Therefore, since the CSI is generated based on a large amount of resources and complexity of the terminal, it can be desirable to preferentially transmit it. In addition, since it can be considered that channel information corresponding to different TRPs is already included in the joint CSI itself, the effect of reporting the STRP CSI corresponding to each TRP can be obtained by reporting the MTRP CSI to the base station.

[0460] The following Table 16 represents an example in which the proposal is applied to the current standard. Specifically, Pri 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), i.e., 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 related to (for) the CSI can be smaller.

[0461] [Table 16]

[0462]

[0463] A2. For MTRP CSI and STRP CSI, CSI for BM can be defined, respectively. And, the CSI for BM can be defined as a higher priority compared to the CSI for non-BM, and MTRP CSI can be defined as a higher priority compared to STRP CSI. In this case, the priority 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 reason and effect are the same as described in A1. Since the CSI for BM is classified into MTRP CSI and STRP CSI, giving MTRP CSI a higher priority can have an advantage. Table 17 below represents 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), can be described as follows. In other words, the value of k can be configured based on the priority 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 value of k related to (for) the CSI can be smaller.

[0464] Table 17 represents an example of applying the proposal of the present disclosure based on the priority rule 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 the only example of applying the proposal. Thus, other examples in which the proposal is applied to the standard are possible.

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

[0469] Meanwhile, assuming that MTRP CSI has higher priority than STRP CSI for the proposed priority rule, but STRP CSI can also be defined to have higher priority than MTRP CSI. Since STRP CSI can have more accurate values than MTRP CSI in terms of a single TRP, there can be an environment in which STRP CSI is preferred. Thus, for such a case, STRP CSI can be defined to have higher priority than MTRP CSI. In this case, for example, an example of priority with respect to A1 described above can 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, an example of priority with respect to A2 described above can 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-described priority rule can be predefined between the base station (or TRP) and the terminal, or the base station (or TRP) can indicate the configuration related to the above-described priority rule to the terminal.

[0471] The CSI set is defined by describing the proposal, and for convenience of description, the CSI set is explicitly classified, but when reporting CSI, each CSI set can not be explicitly classified. An operation of reporting the reporting values of different CSI sets together (or reporting values having a mutual mapping relationship and defined as a pair (e.g., RI1-PMI1-..., RI2-PMI2-... etc.)) by corresponding to one reporting setting, etc. can be defined.

[0472] Proposal 2: Method for configuring terminal with resource sets corresponding to different TRPs in a single resource setting

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

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

[0475] The terminal can report information about the selected resource set (i.e., CSI) to the base station. Here, for N selected resource sets, when a specific CSI set (e.g., j-th CSI set) corresponding to a specific resource set (e.g., i-th resource set) is calculated / acquired / reported, the resource in the specific resource set (e.g., i-th resource set) can be used for CM. In addition, the resources in the (N-1) resource sets other than the specific resource set (e.g., i-th resource set) to which CM is applied can be used for IM of the specific CSI set (e.g., j-th CSI set).

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

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

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

[0479] In Proposal 2, "CSI calculation for multi-TRP transmission" can have the same meaning as the content of the above-described Proposal 1.

[0480] An example of a method for the base station to indicate / configure a resource setting to be used for CSI calculation for multi-TRP transmission to the terminal is as follows. The following method can correspond to an example of L1 / L2 signaling for performing the proposed operation. However, it is obvious 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 reporting setting, operation can be configured by a specific parameter. For example, a parameter in the form of a flag indicating whether to perform operation can be defined in the resource setting. Alternatively, when the time behavior of the resource setting is configured periodically / semi-persistently and a plurality of resource sets are configured, the terminal can perform the proposed operation based on the plurality of 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, configuration of only one resource set is defined. Therefore, when a plurality of resource sets are configured although the time behavior is configured periodically / semi-persistently, it can be used in the condition that CSI computation / acquisition / reporting considering multi-TRP transmission is performed. And / or, when the time behavior for the resource setting is configured aperiodically and a plurality of resource sets are configured in one trigger state (e.g., CSI-AperiodicTriggerState / CSI-AssociatedReportConfigInfo), the terminal can perform the proposed operation based on the plurality of resource sets configured in the corresponding trigger state. In the current standard, when the time behavior of the resource setting is configured aperiodically, a plurality of resource sets can be configured in the resource setting, but it is defined to connect only one resource set when a specific reporting setting is triggered. Therefore, when a plurality of resource sets are configured in one trigger state, although the time behavior is configured aperiodically, it can be used in the condition that CSI computation / acquisition / reporting considering multi-TRP transmission is performed.

[0482] -A2: Operation can be configured by a specific parameter in a reporting setting. A parameter (e.g., reportQuantity) configuring a CSI entry can correspond to an example of the parameter. Here, when a CSI entry for multi-TRP transmission is included in the parameter (e.g., an index / assumption indicator for resource set combination, etc.), the proposed operation (i.e., CSI computation 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 reporting setting, or the value of M can be configured in the resource setting connected with the corresponding reporting setting. Alternatively, it can be determined based on the number of resource sets configured (periodically / semi-persistently) in the resource setting and / or the number of resource sets configured (aperiodically) in the trigger state.

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

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

[0485] Figure 19 FIG. 13 illustrates resource sets and CSI sets according to an embodiment of the disclosure.

[0486] Figure 19 An example representing a relationship with respect to N (e.g., 2) CSI sets and M (e.g., 3) resource sets configured in a resource setting.

[0487] Figure 19 An example representing that N and M are configured as 2 and 3, respectively. In addition, it represents an example in which a resource set for CM in CSI #1 (first CSI set) is included in Set #1 and a resource set for CM in CSI #2 (second CSI set) is included in Set #2. The terminal can calculate CSI of two CSI sets using two resources included in different resource set combinations.

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

[0489] For this operation, CSI calculation can be performed for a total of 27 resource combinations with respect to M (e.g., 3) TRP combinations (in the example of 3 TRP combinations) and K1 (e.g., 3) x K2 (e.g., 3) resource combinations (in the example of 9 resource combinations) including N (e.g., 2) TRP combinations (in the example of 2 TRP combinations) and K1 (e.g., 3) x K2 (e.g., 3) resource combinations (in the example of 9 resource combinations). Figure 19 Figure 19 Meanwhile, when the terminal should consider all TRP combinations and all resource combinations as in the example, there can be a disadvantage that the complexity of the terminal for CSI calculation becomes too high. To compensate for such a disadvantage, the base station can perform indication / configuration to the terminal through L1 / L2 signaling, and / or can fixedly apply a certain rule between the base station and the terminal, so that the terminal can consider only a certain TRP(s) and / or a certain TRP combination(s) and / or a certain resource combination(s) in CSI calculation.

[0490] Meanwhile, when the terminal should consider all TRP combinations and all resource combinations as in the example, there can be a disadvantage that the complexity of the terminal for CSI calculation becomes too high. To compensate for such a disadvantage, the base station can perform indication / configuration to the terminal through L1 / L2 signaling, and / or can fixedly apply a certain rule between the base station and the terminal, so that the terminal can consider only a certain TRP(s) and / or a certain TRP combination(s) and / or a certain resource combination(s) in CSI calculation.

[0491] Next​Figure 20 indicates an example in which a specific rule is applied between the base station and the terminal such that only a specific resource combination is considered in CSI calculation.

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

[0493] Figure 20 illustrates a case in which resources in different RSSs can be one-to-one only in ascending order (or descending order). In Figure 20 , 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 a resource for CM for CSI calculation of the first CSI set. In addition, the terminal can assume a resource of the same order (or index) as the resource in RSS #1 among the resources in RSS #2 as a resource for CM for CSI calculation of the second CSI set. Here, the resource for CM in each CSI set can be used as a resource for IM of the other CSI set.

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

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

[0496] Figure 19 and Figure 20 indicates an example in which the same CSI entry (e.g., CRI / RI / PMI / LI / CQI, etc.) is included in each CSI set. On the other hand, the CSI entry included in each CSI set can be defined differently. Also / Alternatively, the common CSI entry can be defined separately for different CSI sets.

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

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

[0499] - CRI: For different CSI sets, different CRIs can be reported respectively. In this case, different CRIs can indicate CRIs included in different RSSs.

[0500] Alternatively, only one CRI can be reported for different CSI sets. In addition, resource combinations included in different RSSs can be reported based on the corresponding CRI values. In this case, the corresponding CRI values can mean the order (or index) of resources in each RSS. In addition, the bits for CRI reporting can be defined based on the number of resources included in a specific RSS. In this case, only one CRI can be reported instead of two CRIs, so that there is an advantage of saving the number of bits for CRI reporting.

[0501] As an example of this method, when the value indicated by the CRI is j, each jth resource in the selected RSS configured for the CSI set can be selected. A detailed description of information about the selected RSS combination configured for the CSI set is described later.

[0502] - RI: For different CSI sets, different RIs can be reported. Alternatively, only one RI can be reported for different CSI sets, and in this case, both CSI sets can assume one RI reported as above. Thus, when only one RI is reported, the degree of freedom for RI selection becomes low, but the feedback overhead for RI reporting can be reduced.

[0503] Alternatively, for different CRI sets, the RIs in other CSI sets can be defined as differential values compared to the RIs of a specific CSI set based on the RIs 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., a 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-described method, only specific RI combinations can be restricted and defined in the CSI report. For example, the terminal can report only RI combinations such as 1:1, 1:2, 2:1, 2:2, 2:3, 3:2, 3:3, 3:4, 4:3, 4:4 for each CSI set.

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

[0506] - Transmission of 2 codewords (CWs): When the sum of the RI values for different CSI sets is equal to or greater than a specific value (for example, 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 PMs (Precoding Matrices) defined in the standard.

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

[0509] - CQI: For different CSI sets, different independent CQI values can be reported. Here, the SINR assumption for each CQI can be different. For example, CSI #1 can 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 can represent the signal power of the TRP 1 channel and the signal power of the TRP 2 channel, respectively. 1,intf and 2,intf I 1,MU1 and 2,MU2 I 1,MU1 and 2,MU1 I intf I

[0510] Meanwhile, when the base station simultaneously transmits signals from different TPRs (e.g., for NCJT), the reception 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 equation, when different independent CQI values consider only the signal power of a specific TRP, it can have a different value from the CQI in the actual multi-TRP transmission (e.g., for NCJT). Accordingly, the base station can indicate / configure the terminal to report a (single) CQI considering multi-TRP transmission (e.g., for NCJT) through L1 / L2 signaling, or 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 of the transmission layer of PDSCH / the antenna port(s) used for PDSCH (DMRS) / the antenna port(s) used 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 Equation 11 below.

[0513] [Equation 11]

[0514]

[0515] x(i) = [x (0) (i)...x (v-1) (i)] T is a 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.

[0516] In the current standard, one resource is assumed in CSI calculation, and thus, one RI / PMI is assumed. Accordingly, in the CQI calculation defined in the standard, only one RI and PM are considered in the relationship of the transmission layer of PDSCH / antenna port(s) for PDSCH (DMRS) / antenna port(s) for CSI-RS / precoder as well. However, in the CSI calculation considering the multi-TRP transmission, each RI / PMI value corresponding to different CSI sets can have different CSI-RS resources. Accordingly, in this case, the relationship between the CSI-RS port / RI / precoder corresponding to different resources corresponding to different CSI sets and the transmission layer of PDSCH / antenna port of 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 transmission of 1 CW can be reported. In this case, the CQI can be determined based on the following method.

[0519] 1) For the CSI-RS port and the precoder, the order (or index, or order (e.g., ascending or descending order)) for CQI calculation can be defined based on the order (or index, or order) of the CSI set. Equation 12 below represents an example of this method.

[0520] [Equation 12]

[0521]

[0522] In Equation 12, y (p) CSI1 (i) and y (p) CSI2 (i) can 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. P CSI1 and P CSI2The number of CSI-RS ports of the resource corresponding to the first CSI set and the number of CSI-RS ports of the resource corresponding to the second CSI set can be respectively expressed. CSI1 (i) and W CSI2 (i) can respectively express PMs (e.g., PMs selected by the terminal / selected by the rule) corresponding to the first CSI set and PMs (e.g., PMs selected by the terminal / selected by the rule) corresponding to the second CSI set. 0 can express a matrix in which all elements are configured with 0.

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

[0524] 2) For the CSI-RS port and the precoder, an 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 order or descending order). Equation 13 below represents an example of this method.

[0525] [Equation 13]

[0526]

[0527] In Equation 13, y (p) CSIa (i) and y (p) CSIb (i) can respectively express a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set. P CSIa and PCSIb The number of CSI-RS ports of the resources corresponding to the CSIa set and the number of CSI-RS ports of the resources corresponding to the CSIb set can be respectively expressed. CSIa (i) and W CSIb (i) can respectively express PMs (e.g., PMs selected by the terminal / selected by the rule) corresponding to the CSIa set and PMs (e.g., PMs selected by the terminal / selected by the rule) corresponding to the CSIb set. 0 can express a matrix in which all elements are configured with 0.

[0528] In this equation, for CSIa and CSIb, the order can be determined to satisfy RI CSIa ≥RI CSIb or RI CSIa ≤RI CSIb For example, when the first condition is assumed, for RI CSI1 , RI CSI2 = 2, 1, CSIa and CSIb can correspond to CSI1 and CSI2, respectively. Meanwhile, when the RIs of different CSI sets are the same, the order can be defined based on the method of 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 can be reported. In this case, each CQI corresponding to different CWs can 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 set. Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can correspond to transmission layers of different LGs (sequentially). For example, PMs in the CSI set 1 can correspond to transmission layers belonging to LG 1 (sequentially (e.g., in ascending / descending order)), and PMs in the CSI set 2 can correspond to transmission layers belonging to LG 2 (sequentially (e.g., in ascending / descending order)). Equation 14 below expresses an example of this method.

[0532] [Equation 14]

[0533]

[0534] In Equation 14, y (p) CSI1 (i) and y (p) CSI2(i) can respectively denote a symbol transmitted through a p-th CSI-RS port of a resource corresponding to the first CSI set and a symbol transmitted through a p-th CSI-RS port of a resource corresponding to the second CSI set. CSI1 and P CSI2 may respectively denote a number of CSI-RS ports of a resource corresponding to the first CSI set and a number of CSI-RS ports of a resource corresponding to the second CSI set. W CSI1 (i) and W CSI2 (i) can respectively denote a PM (e.g., a PM selected by a terminal / selected by a rule) corresponding to the first CSI set and a PM (e.g., a PM selected by a terminal / selected by a rule) corresponding to the second CSI set. 0 can denote a matrix in which all elements are configured with 0.

[0535] In Equation 14, v 1 LG1 and v 1 LG2 may respectively denote a first layer index of the first LG and a first layer index of the second LG.

[0536] In the method, transmission layers corresponding to different LGs can be defined based on all RI values, and examples can be as follows. For example, for RI=5 / 7 / 8, v 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, 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 LG example, when RI values of different CSI sets are different, LG2 can correspond to a CSI set having a larger RI value. In other words, for all RI values, an LG including a layer corresponding to a CW having a large RI value can correspond to a CSI set having a large RI value.

[0538] Alternatively, when different CSI sets have the same RI value, the CSI sets and the LGs can correspond based on a specific order (e.g., ascending order / descending order), respectively.

[0539] The reason why the LG can be classified as described above is as follows. As described in the following standard, based on TS 38.212, when a terminal is indicated of a DMRS port index through a DCI, it is defined to correspond to a transmission layer in the order of the indicated DMRS port.

[0540] For example), antenna port(s) - 4, 5, or 6 bits, here, the number of CDM groups without values 1, 2, 3 means each CDM group {0, {0,1}, {0,1,2}. The antenna port {p0,...,p v-1} is determined according to the order of the DMRS port(s).

[0541] Meanwhile, when a plurality of TCI states are indicated to a terminal for multi-TRP transmission, each TCI state and DMRS port can be defined in TS 38.214 as follows, so that they can be mapped to each other based on the CDM group including the DMRS port.

[0542] Example) When a UE is not indicated of a DCI including "time domain resource assignment" which is a DCI field indicating an entry in pdsch-TimeDomainAllocationList including RepNumR16 in PDSCH-TimeDomainResourceAllocation, and 2 TCI states in the codepoint of the DCI field "transmission configuration indication" are indicated, and DM-RS port(s) in 2 CDM groups in the DCI field "(one or more) antenna port" 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 group.

[0543] According to the above, when a plurality of TCI states are indicated to a terminal for multi-TRP transmission, each TCI state can be mapped to a DMRS port included in a specific CDM group. And, the DMRS ports are sequentially mapped to transmission layers in the order defined in the standard. Therefore, when 2 CWs are transmitted, the DMRS ports corresponding to different TCI states can correspond to layers corresponding to a specific CW. In other words, a specific CW can be mapped together to different TRPs, not to a specific TRP.

[0544] The following Table 18 represents the mapping relationship between each CW / layer / DMRS port / CDM group when 5 layers are transmitted according to the current standard. (DMRS Type 1 is illustrated)

[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 CQI for different CWs, the mapping relationship should be able to be reflected. For example, according to the mapping relationship of layer-DMRS port-CDM group in the table, layers 0, 1, 4 can correspond to TRP 1, and layers 2, 3 can correspond to TRP 2. 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 transmission 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 layers corresponding to each CW can be classified into layer groups (LGs) based on the mapping relationship of layer-DMRS port-CDM group (i.e., based on the CDM group that the layer will correspond to).

[0549] Figure 23 Fig. illustrates information about CDM groups and DMRS ports corresponding to each layer based on all RIs according to an embodiment of the 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 order or descending order). Here, the transmission layers can be classified into different layer groups (LGs), and different PMs can correspond to the transmission layers of different LGs (sequentially). For example, the PMs in CSI set 1 can correspond to the transmission layers belonging to LG 1 (sequentially (e.g., in ascending order / descending order)), and the PMs in CSI set 2 can correspond to the transmission layers belonging to LG 2 (sequentially (e.g., in ascending order / descending order)). Equation 15 below represents an example of this method.

[0551] [Equation 15]

[0552]

[0553] In Equation 15, y (p) CSIa (i) and y (p) CSIb (i) can represent a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIa set and a symbol transmitted through the p-th CSI-RS port of the resource corresponding to the CSIb set, respectively. P 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 respectively expressed. W CSIa (i) and W CSIb (i) can respectively express PMs (e.g., PMs selected by a terminal / selected by a rule) corresponding to the CSIa set and PMs (e.g., PMs selected by a terminal / selected by a rule) corresponding to the CSIb set. 0 can express a matrix in which all elements are configured with 0.

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

[0555] In Equation 15, v 1 LG1 and v 1 LG2 may respectively express a first layer index of a first LG and a first layer index of a second LG.

[0556] In this method, transmission layers corresponding to different LGs can be defined based on all RI values, and examples can be as follows. For example, for RI = 5 / 7 / 8, v 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, 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 LG example, when the RI values of different CSI sets are different, LG2 can correspond to a CSI set having a larger RI value. In other words, for all RI values, an LG including a layer corresponding to a CW having a large RI value can correspond to a CSI set having a large RI value.

[0558] Alternatively, when different CSI sets have the same RI value, the CSI set and the LG can correspond to each other based on a specific order (e.g., ascending / descending order), respectively.

[0559] - LI (Layer Indicator): For different CSI sets, different independent LI values can be reported. Whether different independent LI values are reported 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 that should 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 assumed to be 2 (i.e., there are 2 CSI sets), the LI value of 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 it is assumed that the RI value corresponding to a specific CSI set is v, the number of bits required to report the LI value of the specific CSI set can be determined based on the number of ports configuring the resource corresponding to the corresponding CSI set. For example, it can be determined such as ceil(log2v) (ceil(x) is the smallest integer not less than x) or min(2, ceil(log2v)). In addition, the reported LI value can represent the strongest layer index corresponding to a specific column of PM of the PMI corresponding to the corresponding CSI set. Meanwhile, when the maximum number of PTRS ports is configured as 1, one LI value can be reported. Alternatively, the LI value selected for a specific CSI set can be reported, and the LI value fixed to a specific value for the remaining N-1 CSI sets can be reported.

[0560] - A1. When one LI value is reported for different CSI sets and independent CQI is 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 configured for the resources corresponding to the CSI set including the maximum RI value. For example, 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 the CSI set with the larger CQI, and / or (when CQI is the same) as the CSI set with the larger RI value, and / or (when CQI / RI is the same) as a particular CSI set (e.g., the first CSI set). The reported LI value can represent the strongest layer index corresponding to a particular column of PMs of PMIs corresponding to the respective 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 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 configured for the resources corresponding to the CSI set including the maximum RI value. For example, 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 the CSI set with the larger RI value, and / or (when RI is the same) as a particular CSI set (e.g., the first CSI set). And / or, the CSI set corresponding to the reported LI value can be determined as the CSI set with the larger signal power / larger SINR. The reported LI value can represent the strongest layer index corresponding to a particular column of PMs of PMIs corresponding to the respective CSI set.

[0562] Meanwhile, when one LI value is reported in the proposal, a variable for reporting whether the LI value is reported can be defined by which CSI set among the plurality of CSI sets it corresponds to. For example, a specific CSI set among two CSI sets can be reported by 1-bit information. Alternatively, a rule can be defined such that the reported LI value will correspond to a specific CSI set. For example, when one LI value is reported, it can be defined to correspond 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, etc. can be arranged based on the LI value. For example, the RI / PMI, etc. corresponding to the LI value 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, pairs can be defined, and the reporting method / reporting information amount, etc. of the PMI can 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 one resource setting. According to the proposal, N RSSs among the M RSSs can be selected, and here, the terminal should report to the base station which RSS combination to use to calculate / acquire / report CSI.

[0566] Meanwhile, in order to omit the report on such selected RSS, the base station can be instructed / configured to calculate / acquire / report CSI for N CSI sets based on N RSSs, or can be defined by a fixed rule. Also, the terminal can not report information on RSS to the base station.

[0567] However, although the same number of RSSs as the CSI sets are configured, there can be a case where the terminal can determine that the performance of a single TRP transmission considering a specific TRP is superior to that of a multi-TRP transmission considering N TRPs. For example, it can correspond to a case where the CQI considering a single TRP transmission is higher than that considering a multi-TRP transmission 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 the number N of CSI sets that should be reported and is greater than N, the terminal should report to the base station which RSS group is used to report the CSI sets. For this, when N CSI sets are reported, the terminal can report to the base station standard information on N or N or fewer RSS groups. 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 that can indicate Combination(M,N) + Combination(M,N-1) +... +Combination(M,1) RSS combinations can be defined, and the terminal can report N or less specific RSSs based on a correspondence between the corresponding bit field and the specific RSS.

[0570] When the number of RSSs reported according to the proposal is less than N, the CSI of N-1 CSI sets (e.g., CRI / RI / PMI / LI / CQI, etc.) configured can be fixed to a specific value. Alternatively, the information / size of part 1 / 2 can be determined based on the number of RSSs reported to the base station. The information about part 1 / 2 is defined in TS 38.214, 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 completely transmitted before part 2.

[0571] In addition to this proposal, in order to reduce the feedback overhead and complexity of CSI calculation of the terminal, it can be defined to calculate / acquire / report CSI only for a specific candidate among all RSS combination candidates of M RSS combinations based on L1 / L2 signaling and / or a fixed rule. Tables 19 to 21 below represent such examples.

[0572] [Table 19]

[0573] Candidate Report RSS #1 On RSS #2 On RSS #3 On RSS #1 - #2 On RSS #1 - #3 On RSS #2 - #3 On

[0574] [Table 20]

[0575] Candidate Report RSS #1 On RSS #2 Off RSS #3 On RSS #1 - #2 On RSS #1 - #3 On RSS #2 - #3 On

[0576] [Table 21]

[0577] Figure 14 Figure 14 Figures 24 to 26 Figure 24 Figure 25 Figure 25 Figure 25 Figure 25 Figure 25 Figure 26 Figure 27 Figure 8 Proposal 3: Method for defining / configuring CSI computation time of CSI report for multi-TRP CSI feedback Proposal 4: Method for defining CSI reference resource of CSI report for multi-TRP (mTRP) CSI feedback

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

[0579] When configured to compute / acquire / report CSI based on the proposal only for a specific candidate among all RSS combination candidates, 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 the total of 6 candidates should be included in the CSI payload. However, in the example of Table 20 or Table 21, CSI can be computed / acquired / reported only for 3 candidates among the 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., fix at a specific size) the size of the CSI payload and fixedly report a specific value (e.g., zero padding) for the specific payload.

[0580] And / or, when it is configured to compute / acquire / report CSI based on the proposal only for a specific candidate among all RSS combination candidates, the number of CPUs (CSI processing units) for CSI reporting can be determined based on the "specific candidate". For example, for the example of Table 19, the number of CPUs for CSI computation / acquisition / reporting for the total of 6 candidates should be considered. However, in the example of Table 20 or Table 21, CSI can be computed / acquired / reported only for 3 candidates among the total of 6 candidates, so it can be defined to consider the number of CPUs for only 3 candidates.

[0581] Meanwhile, in addition to the proposal, it can be defined that it is necessary to calculate / acquire / report the CSI for a specific candidate among all RSS combination candidates possible with M RGs based on L1 / L2 signaling and / or fixed rule. For example, the terminal can be defined to calculate / acquire / report the CSI related to single-TRP transmission. In the example of Table 19, the terminal can calculate / acquire the CSI based on the resources in RSS#1 / #2 / #3 to calculate / acquire / report the CSI for single-TRP transmission, and can report to the base station the CSI calculated / acquired based on specific resources in a specific RSS that is most optimal assuming single-TRP transmission (e.g., highest SINR / CQI / RI / throughput, etc.). The CSI for single-TRP transmission can be always reported regardless of the CSI for multi-TRP transmission, and in addition, the CSI for multi-TRP transmission (e.g., for NCJT / URLLC, etc.) can be reported together. In other words, the example of Table 19 can represent a case in which the CSI for single-TRP and the CSI for multi-TRP are always reported together to the base station. As described above, when the terminal always reports the CSI for single-TRP regardless of the CSI for multi-TRP, when the base station can not be able to perform multi-TRP transmission (although multi-TRP transmission is better for a specific terminal) for any reason, the base station can know the CSI for single-TRP that is suitable for the specific terminal. Thus, there can be an advantage that scheduling suitable for the specific terminal can be performed.

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

[0583] Also, the state related to reporting / partial reporting (e.g., for CSI omission) / non-reporting can be defined by adding or replacing the state for "non-reporting".

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

[0585] Reference Figure 28 (a) NZP CSI-RS resources for resource settings connected to CM and CSI-IM resources for IM are mapped to each other in a resource-by-resource unit when calculating CSI as defined in TS 38.214. For example, a first NZP CSI-RS resource can be applied with a first CSI-IM resource when calculating CSI, and a second NZP CSI-RS resource can be applied with a second CSI-IM resource when calculating CSI.

[0586] Reference Figure 28 (b) When NZP CSI-RS resources for IM are configured in a reporting setting, only one of NZP CSI-RS resources for resource settings connected to CM and CSI-IM resources for IM can be configured. And, NZP CSI-RS resources, CSI-IM resources, and NZP CSI-RS resources for IM can be applied together when calculating CSI.

[0587] Meanwhile, when multiple resource sets in a resource setting are configured according to the proposal, a relationship between resources in the multiple resource sets in the resource setting and CSI-IM / NZP CSI-RS resources configured in a resource setting for IM needs to be defined for CSI calculation, and for this, can be defined as follows.

[0588] Figure 31 is a diagram illustrating a mapping relationship of resources for channel measurement and resources for interference measurement according to an embodiment of the disclosure.

[0589] - CSI-IM resources configured in a resource setting for IM can be mapped to resources in each resource set (RSS) in a resource-by-resource unit.

[0590] Reference Figure 32 For example, a first NZP CSI-RS resource in a first RSS can be applied with a first CSI-IM resource when calculating CSI, and a first NZP CSI-RS resource in a second RSS can also be applied with the first CSI-IM resource when calculating CSI.

[0591] Alternatively, referring to Figure 28 , CSI-IM resources can be mapped to specific resources in a specific RSS (e.g., RSS#2 in Figure 28 ) in a resource-by-resource unit. Resources (e.g., resources in Figure 28 ) mapped to CSI-IM resources among resources in RSSs other than the specific RSS (e.g., RSS#1 in Figure 31Resource #1 in RSS #1) can be mapped to a resource for IM assumption between RSSs (e.g., Resource #1 in RSS #1) when performing CSI computation on a specific resource. Figure 32 Resource #1 in the CSI-IM resource in RSS #1).

[0592] - When NZP CSI-RS resources for IM are configured in the resource setting for IM, only one resource in the resource set can be configured, and when performing CSI computation, the NZP CSI-RS resources in each resource set, the CSI-IM resource, and the NZP CSI-RS resources for IM can be applied together. For example, referring to Figure 31 Resource #1 in RSS #1, CSI-IM resource #1, and NZP CSI-RS resource #1 for IM can be applied together when performing CSI computation.

[0593] Hereinafter, a method of configuring different QCL-typeD reference resources is described.

[0594] The above proposal can assume that no QCL-typeD is configured for resources included in different RSSs, or the same QCL-typeD is configured in a resource-by-resource unit. As described in "Relationship between resource sets in resource settings and CSI-IM / NZP CSI-RS configured in resource settings for IM", the CSI-IM resource and the NZP CSI-RS resource for IM mapped to the resources in each RSS can be equally applied.

[0595] Meanwhile, it is necessary to support a case in which different QCL-typeD RSs are configured by considering a frequency band higher than FR 1. For example, when a terminal can be equipped with multiple panels and simultaneously receive signals by using multiple reception beams, the terminal can receive PDSCH(s) configured with multiple QCL-typeD RSs. In this case, different QCL-typeD RSs need to be configured for resources included in different RSSs to acquire / report CSI considering multi-TRP transmission. To this end, the terminal can report a relative UE capability to the base station. The UE capability can be a capability indicating that the terminal can simultaneously receive signals through multiple spatial domain reception filters based on different QCL-typeD RSs. The base station can configure different QCL-typeD RSs for resources corresponding to different RSSs for CSI calculation considering multi-TRP transmission based on the UE capability for the corresponding terminal. When different QCL-typeD RSs are configured for resources corresponding to different RSSs, the terminal can receive the resources through multiple spatial domain reception filters (i.e., through multiple panels) based on different QCL-typeD RSs. This can be equally applied to CSI-IM resources and NZP CSI-RS resources for IM, which are mapped to resources in each RSS described in "Relationship between resource set in resource setting and CSI-IM / NZP CSI-RS configured in resource setting for IM". In addition, resources corresponding to different RSSs are configured with different QCL-typeD RSs but can be defined to be transmitted in the same OFDM symbol. In addition, resources corresponding to different RSSs can have a one-to-one correspondence between different RSSs.

[0596] Figure 31 FIG. 16 illustrates an operation of receiving a CSI-RS configured with multiple different QCL typeD reference resources according to an embodiment of the disclosure.

[0597] As in Equation 16 below, an operation of receiving a CSI-RS through multiple spatial domain reception filters (i.e., through multiple panels) based on different QCL-typeD RSs can be expressed.

[0598] [Equation 16]

[0599]

[0600] In Equation 16, y 2 ×1 may express a vector of a received signal, and n 2 ×1 may express a vector of noise. x1may express a transmission signal of a CSI-RS port in TRP 1, and x2may express a transmission signal of a CSI-RS port in TRP 2. h i,p,jh 1,1,1 +h 1,2,1 , h 1,1,2 +h 1,2,2 , h 2,1,1 +h 2,2,1 , h 2,1,2 +h 2,2,2 .

[0601] Equation 16 assumes a case where the terminal does not classify the reception antenna ports of different panels. Meanwhile, the terminal can also receive a signal by classifying the reception antenna ports of different panels. Equation 17 below represents an example of a case where the terminal receives a signal by classifying the reception antenna ports of different panels.

[0602] [Equation 17]

[0603]

[0604] As in the above example, assume 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. Also, assume a case where 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 reception beams. Also, the terminal can estimate h 1,1,1 , h 1,2,1 , h 1,1,2 , h 1,2,2, and h is estimated by using the received signal of each receive port of the terminal with the CSI-RS transmitted by resource #b 2,1,1 , h 2,2,1 , h 2,1,2 , h 2,2,2 .

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

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

[0607] In TS 38.214, a CSI processing unit (CPU) representing the number of CSIs that can be simultaneously calculated by the terminal is defined, and the number of CPUs occupying the CPU is differently defined according to the reporting quantity configured in the reporting setting (e.g., the parameter reportQuantity). Table 22 below represents a part of the description of the CPU defined in the standard.

[0608] [Table 22]

[0609]

[0610] In addition to the definition of Table 22, when CSI considering multi-TRP transmission is introduced, the complexity of the terminal can increase compared to the existing operation, and thus a new CPU definition for reflecting it can be introduced. Table 23 illustrates a method of 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 can correspond to O CPU .

[0611] In Table 14 below, various options are proposed through combinations of A1-1, A1-2, A2-1, A2-2, A3-1, A3-2, B1, B2, but not all options are necessarily used. Only options according to any one of the combinations thereof can be used, or options according to two or more combinations can be selectively used by a specific condition, etc.

[0612] For convenience of description, the "CSI considering multi-TRP transmission" can be referred to as mTRP CSI. Also, the "CSI considering multi-TRP transmission" can be configured to the terminal through reportQuantity of CSI-ReportConfig. The "CSI considering multi-TRP transmission" can be defined to include values of (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc., and / or the "CSI considering multi-TRP transmission" can indicate / include a case where beam / RS pair information is configured. Also / Or, the "CSI considering multi-TRP transmission" can indicate / include a case where multiple resource groups are configured in a resource set. Also / Or, the "CSI considering multi-TRP transmission" can indicate / include a case where multiple resource sets are configured in a resource setting. Also / Or, the "CSI considering multi-TRP transmission" can indicate / include a case where multiple CSI sets are configured to be reported. The CSI contrary to the MTRP CSI can be referred to as STRP CSI (i.e., single-TRP CSI), which can indicate the CSI defined previously.

[0613] [Table 23]

[0614]

[0615] In Table 23, N s indicates the number of RSSs (resource sets) corresponding to one reporting setting (or trigger state) (for CSI feedback considering multi-TRP transmission), respectively. K S indicates the number of all resources included in one resource set. C(M, 2) indicates the number of combinations of selecting 2 RSSs from all RSSs (e.g., M RSSs). Here, 2 is only an example, and is not limited thereto, and can be generalized to N. s 'indicates the number of resources included in one RSS. In Table 23, for convenience, it is assumed that the number of resources in the RSS is the same as K s 'for all RSSs, but a case where the number is defined differently can also be considered.

[0616] Hereinafter, each case is described by referring to Table 23.

[0617] A1-1: When all possible CRI combinations for different RSSs are calculated, and here, the operation is 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 the operation is performed by independently changing the RI / PMI, etc. in each resource)

[0618] A1-2: When a specific CRI combination (e.g., a combination having a one-to-one correspondence, first-first, second-second,...) for different RSSs is calculated, and here, the operation is 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 (the CRI combination is limited based on a specific rule) and the operation is performed by independently changing the RI / PMI, etc. in each resource)

[0619] A2-1: When all possible CRI combinations for different RSSs are calculated, but after selecting a specific CRI combination for 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 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 (e.g., by single TRP CSI) in each RSS combination)

[0620] A2-2: When a specific CRI combination (e.g., a combination having a one-to-one correspondence, first-first, second-second,...) for different RSSs is calculated, but after selecting a specific CRI combination for 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 different RSS combinations (when (e.g., by single TRP CSI) the operation is performed by independently changing the RI / PMI, etc. in each resource in the selected CRI combination (the CRI combination is limited based on a specific rule) for each RSS combination)

[0621] A3-1: When all possible CRI combinations for different RSSs are calculated, but after selecting a specific CRI combination for all RSSs (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 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).

[0622] A3-2: When the operation is performed by independently changing the RI / PMI, etc. in the resources of each RSS after selecting a specific CRI combination for all RSSs (e.g., assuming that the CSI for a single TRP can be used for selection) (and / or when 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 (CRI combination is limited based on a specific rule) (e.g., by single TRP CSI)).

[0623] B1: When considering the assumption about single TRP transmission

[0624] B2: When not considering the assumption about single TRP transmission

[0625] In this proposal, for the 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 can be applied without limiting the cases.

[0626] In addition to the proposal, and / or in addition to the existing CPU definition, and / or the following proposal can be considered unilaterally.

[0627] - When the CSI for M-TRP is calculated at the same time, the CPU occupation is assumed to be M-CPU. "M-CPU" can mean the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 method.

[0628] - When the sum of the ranks is equal to or greater than a specific value (e.g., 4), the CPU occupation is assumed to be 2. This can mean that it is defined as a double value compared to the above-mentioned A1-1 / A1-2 / A2-1 / A2-2 / A3-1 / A3-2 / B1 / B2 method and / or it is defined as a double value compared to the existing CPU definition. (It can be equally applied in the following proposal.)

[0629] - When the size of the bandwidth (BW) or the size of the sub-band (SB) configured as the CSI report is equal to or greater than a specific number, the CPU occupation is assumed to be 2. This can 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 method and / or it is defined as a double value compared to the existing CPU definition.

[0630] - In the BM report, the CPU occupancy is assumed to be the number of TRPs. The "BM report" can mean a case where the reportQuantity of CSI-ReportConfig is configured to include a value of cri-RSRP / ssb-Index-RSRP / cri-SINR / ssb-Index-SINR, etc. The "number of TRPs" can correspond to the number of resource sets in the resource setting. Alternatively, each TRP can be classified according to information (e.g., index, identifier (ID)) on the CORESET group (or CORESET pool), and the "number of TRPs" can correspond to the number of CORESET groups (pools) / the number of CORESET group IDs / the number of CORESET pool indexes.

[0631] When the number of CRI candidate values is greater than the number of resources for CM in N CPU calculations, the terminal can recognize it as a CSI report for mTRP (i.e., multiple TRP) CSI feedback.

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

[0633] TS 38.214 defines a priority rule for CSI reporting to determine which CSI to feedback when channels / resources for CSI feedback overlap / conflict. Table 24 below illustrates a part of the description on the priority rule defined in the standard.

[0634] [Table 24]

[0635]

[0636] In addition to this definition, when CSI considering multi-TRP transmission is introduced, much more information can be included compared to the existing defined CSI, so a new priority rule can be defined by reflecting it. The following represents a proposal that can be newly defined priority rule, and an example of applying the proposed based on the priority rule defined in the current standard.

[0637] The CSI considering the multi-TRP transmission can be referred to as MTRP CSI, and can be configured to the terminal through the reportQuantity of the CSI-ReportConfig. In addition, the CSI considering the multi-TRP transmission can be defined to include the values of (joint) cri / RI / PMI / CQI / LI / RSRP / SINR, etc. Also / Or, the CSI considering the multi-TRP transmission can mean / include the case where the beam / RS pair information is configured. Also / Or, the CSI considering the multi-TRP transmission can mean / include the case where (for CM) multiple resource sets are configured in the resource setting. Also / Or, the CSI considering the multi-TRP transmission can mean / include the case where multiple CSI sets are configured to be reported. The CSI contrary to the MTRP CSI can be referred to as STRP CSI (i.e., single TRP CSI), which can mean the CSI defined previously.

[0638] A1. The MTRP CSI can be defined to have a higher priority than the STRP CSI. The higher priority can mean that when the channel / resource for CSI feedback overlaps / conflicts, it can be preferentially transmitted. In addition, the CSI for BM (beam management) (e.g., for L1-RSRP / L1-SINR) can be defined to have the highest priority regardless of the MTRP CSI / STRP CSI. For example, the priority can be defined in the order of the 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 to have the highest priority is that when the BM between the base station and the terminal fails, communication can not be possible due to the deterioration of the signal quality. Therefore, the BM can be smoothly performed by defining the CSI for BM to have the highest priority. Meanwhile, the reason why the MTRP CSI should be defined to have a higher priority than the STRP CSI is as follows. The base station should transmit the CSI-RS corresponding to different TRPs to the terminal to calculate the MTRP CSI. In addition, the terminal should calculate the (joint) CSI by using the corresponding RS, and thus can require more complexity / battery compared to the STRP CSI. Therefore, since the CSI is generated based on a large amount of resources and complexity of the terminal, it can be desirable to preferentially transmit it. In addition, since it can be considered that the channel information corresponding to different TRPs is already included in the joint CSI itself, the effect of reporting the STRP CSI corresponding to each TRP can be obtained by reporting the MTRP CSI to the base station.

[0639] Table 25 below indicates an example in which the proposal is applied to the current standard. Specifically, Pri iCSI(y, k, c, s) can be represented as follows, and for k = 1 (e.g., MTRP CSI (for non-BM)) and for k = 2 (e.g., STRP CSI (for non-BM)), i.e., 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 related to (for) the CSI can be smaller.

[0640] [Table 25]

[0641]

[0642] A2. For MTRP CSI and STRP CSI, CSI for BM can be defined, respectively. And, the CSI for BM can be defined as a higher priority compared to the CSI for non-BM, and MTRP CSI can be defined as a higher priority compared to STRP CSI. In this case, the priority 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 reason and effect are the same as described in A1. Since the CSI for BM is classified into MTRP CSI and STRP CSI, giving MTRP CSI a higher priority can have an advantage. Table 26 below represents an example of applying this proposal to the current standard. Specifically, (y, k, c, s) can be represented 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 the priority 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 value of k related to (for) the CSI can be smaller.

[0643] Table 26 represents an example of applying the proposal of the present disclosure based on the priority rule defined in the current standard.

[0644] [Table 26]

[0645]

[0646] Meanwhile, the example of Table 25 or Table 26 corresponds to one example of the ETGF application proposal, and is not limited to the only example of the application proposal. Thus, other examples in which the application can be based on the proposal are possible. For example, the priority can be determined based on whether the content of MTRP CSI or STRP CSI / CSI / CSI (e.g., cri / RI / PMI / CQI / LI / RSRP / SINR) / the number of MTRP associated with the CSI, etc.

[0647] 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 disclosure is not limited thereto. STRP CSI can also be defined to have a higher priority than MTRP CSI. Since STRP CSI can have a more accurate value than MTRP CSI in terms of a single TRP, there can be an environment in which STRP CSI is preferred. Thus, for such a case, STRP CSI can be defined to have a higher priority than MTRP CSI. In this case, for example, an example of the priority with respect to A1 described above can 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, an example of the priority with respect to A2 described above can be defined in the following order: STRP CSI for BM> MTRP CSI for BM> STRP CSI for non-BM> MTRP CSI for non-BM.

[0648] For example, the above-described priority rule can be predefined between the base station (or TRP) and the terminal, or the base station (or TRP) can indicate the configuration related to the above-described priority rule to the terminal.

[0649] The CSI set is defined when the proposal is described, and for convenience of description, the CSI set is explicitly classified, but when the CSI is reported, each CSI set can not be explicitly classified. The operation of reporting values (or report values having a mutual mapping relationship and defined as a pair (e.g., RI1-PMI1-..., RI2-PMI2-... etc.)) of different CSI sets together by corresponding to one report setting, etc. can be defined.

[0650] The embodiments described in the above proposal 1, proposal 2, etc. can be independently applied, or can be applied together as a combination of a plurality of embodiments.

[0651] The proposals and embodiments described in Proposal 1, Proposal 2, etc. assume that different TRPs can be classified in units of resources or can be classified in units of resource sets. Meanwhile, the TRPs can also be classified in units of resource settings. In this case, the proposals defined in units of resource groups in a single resource set can be applied by extending the proposals in units of resource settings, and the single resource set can represent the TRP unit in Proposal 1. In addition, the proposals defined in units of resource groups in a single resource set can be applied by extending the proposals in units of resource settings, and the single resource set can represent the TRP unit in Proposal 2.

[0652] Hereinafter, a SINR calculation method considering multi-TRP transmission is described.

[0653] Based on Figure 32 As an example, when multi-TRP transmission is considered, the received signal of the terminal is the same as the received signal in Equation 3 above.

[0654] For the received signal of the terminal, H 1 Nrx×N1,tx , H 2 Nrx×N2,tx , H 1,intf Nrx×N1,intf , H 2,intf Nrx×N2,intf The estimated value of the terminal can be generated by 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 of each channel can be defined as in Equation 18 below.

[0655] [Equation 18]

[0656]

[0657] 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 Equation 19 below. In Equation 19, the trace can represent the sum of the diagonal elements of the matrix, and the sum can represent the sum of the magnitudes of all elements of the matrix.

[0658] [Equation 19]

[0659]

[0660] Hereinafter, proposals related to multi-TRP beam reporting improvement are described.

[0661] In the method proposed in the present disclosure, DL MTRP-URLLC means that multiple TRPs transmit the same data / DCI by using different layers / time / frequency resources. For example, TRP 1 transmits the same data / DCI in resource 1, and TRP 2 transmits the same data / DCI in resource 2. The UE configured with the DL MTRP-URLLC transmission method receives the same data / DCI by using different layers / time / frequency resources. Here, it is indicated to the UE which QCL RS / type (i.e., DL TCI (state)) should be used in the layer / time / frequency resource in which the same data / DCI is received from the base station. For example, when the same data / DCI is received in resource 1 and resource 2, it can be indicated that the DL TCI state used in resource 1 and the DL TCI state used in resource 2. 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.

[0662] On the contrary, UL MTRP-URLLC means that multiple TRPs receive the same data / UCI from the UE by using different layers / 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 shares the received data / DCI through a backhaul link connecting between the TRPs. The UE configured with the UL MTRP-URLLC transmission method transmits the same data / UCI by using different layers / time / frequency resources. Here, the UE is indicated from the base station which Tx beam and which Tx power should be used in the layer / time / frequency resource in which the same data / DCI is transmitted (i.e., UL TCI state). For example, when the same data / UCI is received in resource 1 and resource 2, it can be indicated that the UL TCI state used in resource 1 and the UL TCI state used in resource 2. This UL MTRP URLLC can be applied to PUSCH / PUCCH.

[0663] In addition, in the method proposed in the present disclosure, when a specific TCI state (or TCI) is used ( / mapped) when receiving data / DCI / UCI for any frequency / time / space resource, it can mean that the DL estimates a channel from the DMRS by using the QCL type and the QCL RS indicated by the corresponding TCI state in that frequency / time / space resource, and receives / demodulates data / DCI to the estimated channel. It can 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 that frequency / time / space resource.

[0664] The UL TCI state has the UE's Tx beam and / or Tx power information, and spatial relation information, etc., and 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 relation information of the SRS resource indicated by the SRI (SRS resource indicator) field of the UL grant DCI. Alternatively, it can represent the OL (open loop) Tx power control parameter connected to the value indicated by the SRI field of the UL grant DCI (j: index for open loop parameters Po and a (up to 32 parameter value sets per cell), q_d: index of the 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)).

[0665] On the other hand, assuming that MTRP-eMBB indicates that multiple TRPs transmit other data by using different layers / time / frequency, a UE configured with the MTRP-eMBB transmission method is indicated multiple TCI states with DCI, and data received by using the QCL RS of each TCI state is different data.

[0666] In addition, the UE can understand whether MTRP URLLC transmission / reception or MTRP eMBB transmission / reception by classifying and using RNTIs for MTRP-URLLC and RNTIs for MTRP-eMBB, respectively. In other words, when CRC masking of DCI is performed by using RNTI for URLLC, it is considered as URLLC transmission, and when CRC masking of DCI is performed by using RNTI for eMBB, it is considered as eMBB transmission. Alternatively, the base station can configure MTRP URLLC transmission / reception, or can configure MTRP eMBB transmission / reception to the UE through other new signaling.

[0667] In the present disclosure, in order to facilitate description, the proposal is applied by assuming cooperative transmission / reception between 2 TRPs, but it can be extended and applied in a 3 or more multi-TRP environment, and can also be extended and applied in a multi-panel environment. The UE can recognize different TRPs as different TCI states, and when the UE receives / transmits data / DCI / UCI by using TCI state 1, it indicates that data / DCI / UCI is received from / transmitted to TRP 1.

[0668] The proposal of the present disclosure can be utilized in the case where PDCCH is transmitted cooperatively by MTRP (identically or partially), and some proposals can be utilized even in the case where PDSCH is transmitted cooperatively by MTRP or PUSCH / PUCCH is received cooperatively.

[0669] In addition, in the present disclosure, when multiple base stations (i.e., MTRP) repeatedly transmit the same PDCCH, this can mean that the same DCI is transmitted by multiple PDCCH candidates, and that multiple base stations repeatedly transmit the same DCI. The same DCI can mean two DCIs with the same DCI format / size / payload. Alternatively, although two DCIs have different payloads, they can be considered the same DCI when the scheduling results are the same. For example, the TDRA (Time Domain Resource Allocation) field of the DCI determines the slot / symbol position of the data and the slot / symbol position of the A / N (ACK / NACK) relatively based on the reception time of the DCI, and if the DCI received at time n and the DCI received at time n+1 indicate the same scheduling result for the UE, the TDRA fields of the two DCIs are different, and thus the DCI payloads are different. The repetition number R can be directly indicated by the base station or agreed upon by the UE. Alternatively, although the payloads of the two DCIs are different and the scheduling results are not the same, they can be considered the same DCI when the scheduling result of one DCI is a subset of the scheduling result of the other DCI. For example, when the same data is repeatedly transmitted N times by 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 scheduling data of DCI 2 becomes a subset of the scheduling data of DCI 1, and the two DCIs are scheduling the same data, so in this case, they can be considered the same DCI.

[0670] In addition, in the present disclosure, when multiple base stations (i.e., MTRP) partially transmit the same PDCCH, it means that one DCI is transmitted by one PDCCH candidate, and some resources defined for that PDCCH candidate are transmitted by TRP 1 and the remaining resources are transmitted by TRP 2.

[0671] Additionally, in the present disclosure, when a UE repeatedly transmits the same PUSCH so that multiple base stations (i.e., MTRP) 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 UL TCI state 1 for TRP 1, and link adaptation such as a precoder / MCS also performs transmission by a scheduling value optimized for the channel of TRP 1. PUSCH 2 performs transmission by using UL TCI state 2 for TRP 2, and link adaptation such as a precoder / MCS also performs transmission by a scheduling value optimized for the channel of TRP 2. The repeatedly transmitted PUSCH 1 and 2 in this case can be transmitted at different times to perform time division multiplexing (TDM), frequency division multiplexing (FDM), spatial division multiplexing (SDM).

[0672] Additionally, in the present disclosure, when a UE partially transmits the same PUSCH so that multiple base stations (i.e., MTRP) 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 5 previous symbols by using UL TCI state 1 of TRP 1, and also transmits link adaptation such as a precoder / MCS by a scheduling value optimized for the channel of TRP 1. The remaining 5 symbols are transmitted by using UL TCI state 2 for TRP 2, and also transmitted link adaptation such as a precoder / MCS by a scheduling value optimized for the channel of TRP 2. In this example, transmission of TRP 1 and 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.

[0673] Similarly to the PUSCH transmission, the UE can repeatedly transmit or partially transmit the same PUCCH so that multiple base stations (i.e., MTRP) can receive the PUCCH.

[0674] The proposal of the present disclosure can be extended and applied to various channels such as PUSCH / PUCCH / PDSCH / PDCCH, etc.

[0675] The UE can have 2 Rx panels, which can simultaneously receive two beams to receive MTRP PDSCH. For example, the UE receives data 1 transmitted from TRP 1 by using panel / beam 1, and simultaneously receives data 2 transmitted from TRP 2 by using panel / beam 2. Here, only when the beam of TRP 1 received by panel 1 should have high reception strength and the beam of TRP 2 should have low reception strength, data 1 can be effectively received, and only when the beam of TRP 2 received by panel 2 should have high reception strength and the beam of TRP 1 should have low reception strength, data 2 can be effectively received.

[0676] The UE reports reception strength information about the candidate beam of TRP 1 and the candidate beam 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 thereon. For example, when the transmittable beam candidates of TRP 1 (i.e., the transmission BM (Beam Management)-RS of TRP 1) are NZP CSIRS 1, 2 (1 port each) and the transmittable beam candidates of TRP 2 (i.e., the transmission BM (Beam Management)-RS of TRP 2) are NZP CSIRS 3, 4 (1 port each), the base station can determine which combination of the two beam candidates of TRP 1 corresponding to NZP CSIRS 1, 2 and the two beam candidates of TRP 2 corresponding to NZP CSIRS 3, 4 will be effective for MTRP PDSCH transmission. To this end, the UE can perform L1-SINR beam reporting using NZP CSIRS 1, 2, 3, 4.

[0677] 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.

[0678] 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 cases where beam candidates for MTRP transmission. However, such an assumption does not limit the technical scope of the present disclosure.

[0679] (CMR, IMR) = {(NZP CSIRS 1, NZP CSIRS 3), (NZP CSIRS 1, NZP CSIRS 4),(NZP CSIRS 2, NZP CSIRS 3), (NZP CSIRS 2, NZP CSIRS 4), (NZP CSIRS 3, NZPCSIRS 1), (NZP CSIRS 3, NZP CSIRS 2), (NZP CSIRS 4, NZP CSIRS 1), (NZP CSIRS4, NZP CSIRS 2)}

[0680] The UE is configured to report L1 SINR for 8 (CMR, IMR) pairs, and the UE reports values of 8 L1 SINRs corresponding to each CMR, IMR pair. The base station reporting the L1 SINR values finds the pair i and j with argmax ij (L1-SINR ij +L1-SINR ji ). Here, L1-SINR ij denotes SINR measured with (CMR, IMR) = (NZP CSIRS i, NZP CSIRS j). Alternatively, i and j can be found with argmax ij (tput(L1-SINR ij )+tput(L1-SINR ji )). tput(L1-SINR) denotes transmittable throughput for L1-SINR, and for example, can denote log(1+ L1-SINR). Alternatively, i and j are found by simple summation of L1-SINR or tput in the equation, but in addition thereto, i and j can be found that maximize the minimum of L1-SINR ij and L1-SINR ji . Further, i and j can be found that maximize the minimum of tput(L1-SINR ij ) and tput(L1-SINR ji ). This method has a disadvantage of large beam reporting overhead.

[0681] Hereinafter, in the description, it is assumed for convenience of description that NZP CSIRS 1 / 2 / 3 / 4 are cases in which NZP CSIRS 1 / 2 / 3 / 4 are beam candidates (e.g., BM-RS, NZP CSIRS) for MTRP transmission. But such an assumption does not limit the technical scope of the present disclosure.

[0682] <Method 1>

[0683] The L1 SINR beam report configured for the UE can be configured as follows. The (CMR, IMR) pair can be configured by configuring the NZP CSI RS for a certain TRP as the CMR and the NZP CSI RS for other TRP as the IMR (e.g., BM-RS, NZP CSI RS) in the beam candidate. The following example is an example in which the NZP CSI RS for TRP 1 (e.g., NZP CSI RS 1 / 2) is configured as the CMR and the NZP CSI RS for TPR2 (e.g., NZP CSI RS 3 / 4) is configured as the IMR.

[0684] (CMR, IMR) = {(NZP CSI RS 1, NZP CSI RS 3), (NZP CSI RS 1, NZP CSI RS 4),(NZP CSI RS 2, NZP CSI RS 3), (NZP CSI RS 2, NZP CSI RS 4)}

[0685] The UE can calculate the L1-SINR by applying the receive beam (i.e., QCL Type D) of the NZP CSI RS i (i.e., CMR) to the CMR and the IMR of (NZP CSI RS i, NZP CSI RS j) ij . Also, the L1-SINR ij ' is found by applying the receive beam / panel (i.e., QCL Type D) of the NZP CSI RS j (i.e., IMR) to the CMR and the IMR ij . Thus, the L1-SINR ij ' indicates the SINR value when the data of TRP 1 is received by using the receive beam / panel used when receiving the data from TRP 2. In other words, it indicates that the SINR is received larger when receiving the data from TRP 2 when the value of the L1-SINR ij ' is smaller, and the SINR is received larger when receiving the data from TRP 1 when the value of the L1-SINR

[0686] The UE reports the best N L1-SINR (the best N L1-SINR indicates N L1-SINRs having the largest values, reports the i, j pair corresponding thereto to the CRI, and reports the value of the L1-SINR) as before. Also, the UE additionally reports the worst N L1-SINR' (i.e., N L1-SINRs having the smallest values). The best N L1-SINR ijindicates the best beam pair i, j in order when receiving data of TP 1 using Rx beams in the direction of TP 1, and worst N L1-SINR_ij' indicates the worst beam pair i, j in order when receiving data of TP 1 using Rx beams in the direction of TP 2. Alternatively, it is possible to save UL resources by reporting only the values of the corresponding i, j pair without the values of L1-SINR ij ' of the worst N L1-SINR ij ' of the best N L1-SINR

[0687] (L1-SINR ij ')-1 and L1-SINR ji ' are the same. Thus, the best N (L1-SINR ij ')-1 can be reported instead of the worst N L1-SINR ij '. In this case, (L1-SINR ij ')-1 has the advantage that the quantization table used for reporting the existing L1-SINR value can be used as it is. Alternatively, the differential value between L1-SINR ij and (L1-SINR')-1 can be reported instead of (L1-SINR ij ')-1 value.

[0688] Alternatively, the best N L1-SINR ij ' can be reported, and the values of L1-SINR ij ' and L1-SINR ij '-1 corresponding to this ij can be reported together.

[0689] Alternatively, the UE finds the best N (i, j) pair having large L1-SINR ij +(L1-SINR ij ')-1, and reports L1-SINR ij or (L1-SINR ij ')-1 or the sum of both corresponding thereto. Alternatively, the UE finds the best N (i, j) pair having large tput(L1-SINR ij )+tput((L1-SINR ij ')-1), and reports L1-SINR ij or (L1-SINR ij ')-1 or the sum of both corresponding thereto. Alternatively, i and j are found by simple summation of L1-SINR or tput in the equation, but in addition thereto, L1-SINRijand (L1-SINR iji and j that maximize the minimum of tput(L1-SINR ij ) and tput((L1-SINR ij ')-1) can be found and reported, and the L1-SINR ij corresponding to them can be reported, or the sum of (L1-SINR ij ')-1 or both.

[0690] <Method 2>

[0691] The L1 SINR beam report configured for the UE can be configured as follows. The (CMR, IMR) pair can be configured by configuring the NZP CSI RS for a certain TRP as the CMR and the NZP CSI RS for other TRP as the IMR (e.g., BM-RS, NZP CSI RS) in the beam candidate. The following example is an example in which the NZP CSI RS (e.g., NZP CSI RS 1 / 2) for TRP 1 is configured as the CMR and the NZP CSI RS (e.g., NZP CSI RS 3 / 4) for TPR2 is configured as the IMR.

[0692] (CMR, IMR) = {(NZP CSI RS 1, NZP CSI RS 3), (NZP CSI RS 1, NZP CSI RS 4),(NZP CSI RS 2, NZP CSI RS 3), (NZP CSI RS 2, NZP CSI RS 4)}

[0693] The UE calculates the L1-SINR ij for (NZP CSI RS i, NZP CSI RS j), and additionally calculates and reports the L1-ISNR ij . The L1-ISNR ij indicates the interference-to-signal-plus-noise power ratio by measuring the received power of the CMR and the IMR of the receive beam / panel (i.e., QCL Type D) of the NZP CSI RS j (i.e., IMR), configuring the measured power of the IMR as the numerator and configuring the measured power of the CMR as the denominator. Thus, the L1-ISNR ij is the L1-SINR ji .

[0694] The UE reports the best N L1-SINRs (the best N L1-SINRs indicate N L1-SINRs having the maximum values, the pair of i and j corresponding to them is reported to the CRI, and the value of the L1-SINR is reported) as before, in addition, the best N L1-ISNRs are reported. The best N L1-SINRsij indicate the best beam pair i and j in order when receiving TP 1's data with Rx beams in the direction of TP 1, and the best N L1-ISNR ij indicate the best beam pair i and j in order when receiving TP 2's data with Rx beams in the direction of TP 2. Alternatively, one can save UL resources by only indicating the corresponding i and j pair without reporting the value of L1-ISNR ij ij ij ij ij

[0695] Alternatively, one can report the best N L1-SINRij, and one can report the value of L1-ISNRijcorresponding to this ijtogether.

[0696] Alternatively, the UE finds the best N (i,j) pair with large L1-SINR ij + (L1-ISNR ij ), and reports the sum of L1-SINR ij or (L1-ISNR ij ) or both corresponding to it. Alternatively, the UE finds the best N (i,j) pair with large tput(L1-SINR ij ) + tput((L1-ISNR ij )), and reports the sum of L1-SINR ij or (L1-ISNR ij ) or both corresponding to it. Alternatively, in the formula, i and j are found by simple sum of L1-SINR or tput, but in addition, i and j that maximize the minimum of L1-SINR ij and (L1-ISNRv) or i and j that maximize the minimum of tput(L1-SINR ij ) and tput((L1-ISNR ij )) are found and reported, and the sum of L1-SINR ij or (L1-ISNR ij ) or both corresponding to it is reported.

[0697] <Method 3>

[0698] The L1 SINR beam report configured for the UE can be configured as follows.

[0699] ​​​​​(CMR, IMR) = {Group A (NZP CSIRS 1, NZP CSIRS 3), (NZP CSIRS 3, NZP CSIRS 1), 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 CSIRS 4), (NZP CSIRS 4, NZP CSIRS 2)}

[0700] The base station can group the 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 calculates the L1-SINR value with the CMR, IMR pair belonging to the same group. For example, for Group A, the L1-SINR is calculated as 13 and L1-SINR 31 The UE reports the best N (L1-SINR) group based on the SINR value thus calculated. The base station can directly signal the grouping information, or indirectly agree to switch the resources of CMR and IMR as grouped pairs. For example, as in the example above, Group A can 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 can be agreed / defined by switching the order of the corresponding measurement resources as grouped as a pair.

[0701] The method of selecting / reporting the best N group is as follows.

[0702] First, the L1 SINR value calculated by the first (or last) CMR, IMR pair of each group is compared to select the best N group with a large value.

[0703] Alternatively, the UE compares the sum of the L1 SINR values computed by each group of CMR, IMR pair and selects the best N groups with large values. Alternatively, the L1 SINR computed by each group of CMR, IMR pair is replaced with tput to find the sum of tput values and select the best N groups with large values. Alternatively, the minimum value of the L1 SINR or tput values computed by each group of CMR, IMR pair is found to select the best N groups with the largest minimum value.

[0704] The L1-SINR corresponding to the best N groups is reported as the following value.

[0705] The L1 SINR value computed by the first (or last) CMR, IMR pair of the best N groups can be reported.

[0706] Alternatively, all the L1 SINR values computed by the CMR, IMR pairs of the best N groups can be reported. Here, the L1 SINR values of the remaining CMR, IMR pairs can be reported as differential values based on the L1 SINR value of a particular one of the CMR, IMR pairs of the best N groups. For example, the difference of the L1 SINR computed by the remaining CMR, IMR pairs of the corresponding group from the L1 SINR computed by the first CMR, IMR pair of the best N groups can be reported.

[0707] <Method 4>

[0708] The L1 SINR beam reporting configured for the UE can be configured as follows. The (CMR, IMR) pair can be configured by configuring the NZP CSI RS for a particular TRP as the CMR and the NZP CSI RS for other TRPs as the IMR (e.g., BM-RS, NZP CSI RS) in the beam candidate. The following example is an example where the NZP CSI RS for TRP 1 (e.g., NZP CSI RS 1 / 2) is configured as the CMR and the NZP CSI RS for TPR 2 (e.g., NZP CSI RS 3 / 4) is configured as the IMR.

[0709] (CMR, IMR) = {(NZP CSI RS 1, NZP CSI RS 3), (NZP CSI RS 1, NZP CSI RS 4), (NZP CSI RS 2, NZP CSI RS 3), (NZP CSI RS 2, NZP CSI RS 4)}

[0710] The UE computes the L1-SINR for (NZP CSI RS i, NZP CSI RS j) ij, and additionally measure the port power of NZP CSI RS j configured as IMR to compute and report L1-RSRP. (It is called IMR-based L1-RSRP.) Here, the power is measured by applying the receive beam / panel (i.e., QCL Type D) of NZP CSI RS j (i.e., IMR).

[0711] The UE reports the best N L1-SINR (the best N L1-SINR means N L1-SINRs having the maximum values, i and j pairs corresponding thereto are reported to CRI, and the values of L1-SINR are reported) as before, and additionally reports L1-RSRP based on the best N IMR. Alternatively, it is possible to save UL resources by indicating only i and j pairs corresponding to L1-RSRP based on the best N IMR without reporting the values of L1-ISNR ij .

[0712] Alternatively, the best N L1-ISNR ij may be reported, and the values of L1-RSRP corresponding to the ij can be reported together.

[0713] Alternatively, i and j maximizing the minimum values of L1-SINR ij and / or L1-RSRP ij based on IMR are found to report L1-RSRP ij or (L1-RSRP ij based on IMR) corresponding thereto. Alternatively, the best N L1-SINR ij is calculated, and only when the value of L1-RSRP based on IMR corresponding to the ij of the best N L1-SINR ij is equal to or greater than a certain threshold, the best N L1-SINR ij is reported.

[0714] In the above-described methods (Proposal 1 / 2 / 3 / 4, etc.), for convenience of description, the CSI / beam computation / reporting based on TRP 2 is described, but equally, the CSI / beam of TRP 1 can also be computed / reported with inverse CQI. In addition, for convenience of description, the operation based on 2 TRPs (e.g., TRP 1 / TRP 2) is described, but of course, it can be extended to multiple TRP operation.

[0715] In the disclosure, it is described based on “TRP”, but as described above, it can be applied by replacing with an expression such as panel, cell, transmission point (TP), base station (gNB, etc.). Also, as described above, the TRP can be classified according to information (for example, index) on 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 one terminal is configured with multiple CORESET groups (or CORESET pools). Such a configuration for the CORESET group (or CORESET pool) can be performed through higher layer signaling (for example, RRC signaling, etc.). Also, when multiple CORESET groups are configured for one terminal, the corresponding terminal can be configured or defined to receive data by using a multi-DCI based M-TRP operation.

[0716] Figure 31

[0717] Table 27 below shows the definition of CSI computation time defined in the current standard TS 38.214.

[0718] [Table 27]

[0719]

[0720]

[0721] Table 28 illustrates CSI computation delay request 1.

[0722] [Table 28]

[0723]

[0724] Table 29 illustrates CSI computation delay request 2.

[0725] [Table 29]

[0726]

[0727] In Table 27, the CSI computation time assumption considers the CSI feedback of a single TRP. However, for mTRP CSI feedback, the terminal complexity can increase due to the increase in assumptions, etc. Therefore, for mTRP CSI feedback, the value of Z, Z' can be defined separately by considering the increase in terminal complexity. The method thereof is described as follows.

[0728] Proposal 3-1: For the CSI report of mTRP CSI feedback, the CSI computation time can be defined as follows by considering the additional time required for the terminal based on the value of a specific parameter (for example, Z2) related to the CSI computation time defined in the current standard.

[0729] For the value used as a standard in Proposal 3-1, other values than the value of Z2 defined in the current standard can also be used. In other words, any one of the values defined in the current standard can become a standard value.

[0730] Table 30 illustrates CSI computation time for mTRP CSI feedback according to the method proposed in the disclosure.

[0731] [Table 30]

[0732]

[0733] 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 can be defined by a fixed rule, or can be configured / indicated to the terminal based on L1 / L2 signaling of the base station and / or a reported value of the terminal (e.g., UE capability, etc.).

[0734] As an example of a fixed rule, all values of X1, X2, X3, X4 and X'1, X'2, X'3, X'4 can be defined as 0. In this case, the multi-TRP CSI feedback can obtain the effect of applying the maximum value of the CSI computation time defined in the current standard.

[0735] In addition, (part or all) values of X1, X2, X3, X4 and X'1, X'2, X'3, X'4 can be defined as the same / different values. For example, X1=X'1, X2=X'2, X3=X'3, X4=X'4 (here, X1≠X2≠X3≠X4).

[0736] When this proposal is applied, there is an effect of allowing the terminal to process CSI computation with high complexity by defining the minimum value as a value equal to or greater than the currently defined maximum value.

[0737] Proposal 3-1: For CSI reporting for multi-TRP CSI feedback, a CSI computation time larger than the value Z, Z' corresponding to the condition n can be defined / configured even when the condition n is satisfied (e.g., Z2, Z'2).

[0738] In the above, the condition 1 (i.e., 1 is included in n) can mean that the condition corresponding to Z1, Z'1 defined in Table 28 is satisfied. For example, based on such a proposal, for CSI reporting for multi-TRP CSI feedback, a value larger than Z1, Z'1 in Table 28 (e.g., Z2, Z'2) can be defined even when the condition 1 is satisfied.

[0739] In the above, condition 2 can mean that Z1 defined in Table 29 is satisfied. Z'1 corresponding condition. For example, even when condition 2 is satisfied based on such a proposal, for CSI reporting of multi-TRP CSI feedback, it can be defined to be greater than Z1 defined in Table 29, Z'1 value (e.g., Z2, Z'2).

[0740] In the above, condition 3 can mean that Z3 defined in Table 29 is satisfied. Z'3 corresponding condition. For example, even when condition 3 is satisfied based on such a proposal, for CSI reporting of multi-TRP CSI feedback, it can be defined to be greater than Z3 defined in Table 29, Z'3 value (e.g., Z2, Z'2).

[0741] As an embodiment of the proposal, the condition "does not correspond to CSI reporting for multi-TRP (mTRP) CSI feedback" can be additionally included in condition 1 and / or condition 2 and / or condition 3.

[0742] Here, "CSI reporting for mTRP CSI feedback" can mean at least any one of the following.

[0743] When the reporting quantity includes a quantity for mTRP CSI feedback; and / or

[0744] Multiple CSI-RS resources (for channel measurement) (and associated IMR) are configured,

[0745] 2-1. When multiple CRI, CQI, and / or RI reporting is configured, and / or

[0746] 2-2. When multiple PMI (corresponding to different CSI-RS resources) for the same frequency band (e.g., subband, wideband) reporting is configured, and / or

[0747] 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

[0748] When configured to report CRI equal to or greater than the number of multiple CSI-RS resources (for channel measurement) (e.g., LTE CoMP CSI: CMR = {CSIRS1, CSIRS2}, CRI = {0, 1, 2}, for CRI = 0, joint CQI reporting); and / or

[0749] When the calculation dependency between the (CMR, IMR) pair configured for one CSI (CSI1) and the (CMR, IMR) pair configured for another CSI (CSI2) is configured (for example, when CSI is calculated as the CMR of CSI1 is used as the IMR of CSI2 and the CMR of CSI2 is used as the IMR of CSI1); and / or

[0750] For a terminal that reports / indicates / configures / perform the proposed operation related to mTRP beam reporting improvement, it can be considered as an mTRP reporting L1-RSRP / L1-SINR based terminal. Thus, when the terminal is configured / indicated to perform the proposed operation related to mTRP beam reporting improvement, the terminal can identify it as for performing the proposed condition corresponding to Condition 2 and / or Condition 3 (e.g., applying a larger CSI calculation time); and / or

[0751] For a terminal that reports / indicates / configures / perform the operation corresponding to Proposal 1 / Proposal 2 of the present disclosure (may also include the operation extended in the resource setting unit).

[0752] Examples 1 to 6 on the CSI report for the above-mentioned mTRP CSI feedback can be applied independently or can be applied by combining two or more examples.

[0753] Examples 1 to 6 on the CSI report for the mTRP CSI feedback can be used as the operation / A condition of the terminal for distinguishing from the single-TRP based CSI feedback of the CSI report defined in the previous version of the present disclosure.

[0754] Figure 31

[0755] Table 31 below shows the definition of the CSI reference resource defined in the current standard TS 38.214.

[0756] [Table 31]

[0757]

[0758]

[0759] For periodic (P) / semi-persistent (SP) CSI reporting, in the case of mTRP CSI feedback, the value of n CSI_ref may be defined separately by considering the increase in terminal complexity. Proposal 4-1: When P / SP CSI reporting is configured as multi-TRP (mTRP) CSI feedback, the value of n CSI_ref for the CSI reference resource definition can be defined as follows. The value of n CSI_ref is the value of nCSI_ref X*2 corresponding to the effective downlink slot μ DL the same or greater than X*2 μ DL the minimum value.

[0760] Hereinafter, examples regarding X are described.

[0761] 1. Option 1: X = 5 + a

[0762] Here, the value of a can correspond to an integer equal to or greater than 0, and can be defined by a fixed rule (e.g., a = 1), or can be configured / indicated to the terminal based on L1 / L2 signaling of the base station and / or a reported value (e.g., UE capability, etc.) of the terminal. For example, when the P / SP CSI report is configured as mTRP CSI feedback (for multiple CSI-RS / SSB resources), X can be defined as 6.

[0763] Alternatively, the value of X itself can be defined by a fixed rule (e.g., X = 6). Alternatively, the value of X can be configured / indicated to the terminal based on L1 / L2 signaling of the base station and / or a reported value (e.g., UE capability, etc.) of the terminal.

[0764] Since the value of X is defined as the minimum value equal to or greater than the maximum value currently defined, it can be possible to allow the terminal to process CSI calculation with high complexity.

[0765] Option 2: When a single CSI-RS / SSB resource is configured for CM to each TRP, X can be defined as 4 + a1, and when multiple CSI-RS / SSB resources are configured for CM to each TRP, X can be defined as 5 + a2.

[0766] The values of a1 and a2 can correspond to an integer equal to or greater than 0, and can be defined by a fixed rule (e.g., a = 1), or can be configured / indicated to the terminal based on L1 / L2 signaling of the base station and / or a reported value (e.g., UE capability, etc.) of the terminal.

[0767] The values of a1 and a2 can be defined as the same / different values.

[0768] In this proposal, the expression of "to each TRP" can be interpreted to mean that the CSI-RS / SSB resource is 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 to mean a specific TRP. For example, each TRP can correspond to each resource group defined in the single resource set in Proposal 1, and each TRP can correspond to each resource set in the single resource setting in Proposal 2.

[0769] Alternatively, the value of X for a single CSI-RS / SSB resource and the value of X for multiple CSI-RS / SSB resources can be defined by a fixed rule, respectively (for example, X=6). Alternatively, the terminal can be configured / indicated based on the L1 / L2 signaling of the base station and / or the reporting value of the terminal (for example, UE capability, etc.).

[0770] Likewise, a more complex CSI reference resource can be defined based on the number of resources for CM corresponding to each TRP.

[0771] In the above, the "CSI report for mTRP CSI feedback" can follow the embodiments described in Proposal 3 described above.

[0772] Table 32 below shows the definition of the CSI reference resource defined in the current standard TS 38.214.

[0773] [Table 32]

[0774]

[0775] Referring to Table 32 and the description related to Equation 4, in the definition of the CSI reference resource for CQI / RI / PMI calculation, the overhead of the 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 therefrom is relatively large. Therefore, if it is not considered in the CSI calculation, a problem of a decrease in the accuracy of the CSI can occur. Therefore, a method in which the PT-RS overhead can be reflected in the CSI calculation when 2-port PT-RS (or for 2 or more port PT-RS) can be applied is proposed.

[0776] Rel-16 includes the same content as in Table 33 below with respect to 2-port PT-RS.

[0777] [Table 33]

[0778]

[0779] Proposal 4-2: When CSI reference resources (e.g., CQI / RI / PMI) for CSI computation of a terminal are defined based on an implicit / explicit method, the base station can perform configuration / indication to consider the overhead of N (e.g., 2) port PT-RS. Examples of the implicit method

[0780] 1. When the maximum number of PT-RS ports is configured as X (e.g., 2) or more (e.g., n2 of maxNrofPorts-R16 in PTRS-DownlinkConfig) for the terminal, and / or

[0781] 2. When the CSI report is configured as mTRP CSI feedback, the "mTRP CSI feedback" above can follow the embodiments described in Proposal 3, and / or

[0782] 3. When configured / indicated to report multiple LI values for a single CSI report

[0783] When the conditions are met, the terminal can reflect the overhead of N (e.g., 2) port PT-RS on the CSI reference resources.

[0784] Examples of the implicit method can be applied independently, or two or more examples can be combined and applied.

[0785] - Examples of the explicit method

[0786] 1. When the terminal is configured / indicated to reflect the overhead of N port PT-RS on the CSI reference resources based on L1 / L2 signaling

[0787] As described above, when the configuration / indication is performed, the terminal can reflect the overhead of N (e.g., 2) port PT-RS on the CSI reference resources.

[0788] The implicit method and the explicit method can be applied independently, or can be combined and applied.

[0789] - Conditions that can be considered together with the implicit method / explicit method

[0790] Under this condition, when the time / frequency density of PT-RS is equal to or greater than a certain value (e.g., for every N PRB / every M symbol (e.g., N≤2, M≤1)), Proposal 4-2 can be applied. The following methods are examples thereof.

[0791] 1. When the bandwidth configured for CQI reporting corresponding to the CSI report is included in a certain range, and / or

[0792] 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, a specific range can be configured / indicated to a terminal based on L1 / L2 signaling (e.g., based on the frequency density in PTRS-DownlinkConfig) and / or a reported value of the terminal (e.g., UE capability, etc.).

[0793] 2. When a specific CQI condition is satisfied

[0794] 2-1. As an example of a specific CQI condition, a case where the modulation order is equal to or greater than M (e.g., 64 QAM) / the CQI index is equal to or greater than n / the code rate is equal to or greater than X / the efficiency is equal to or greater than X / the SNR ( / SINR) is equal to or greater than a specific value is applicable.

[0795] 3. Motivation of the method and application pattern

[0796] 3-1. The frequency axis pattern / density of PT-RS can be determined according to the size of the bandwidth scheduled to the terminal. However, when the bandwidth is too small, PT-RS can 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 much, and thus, the impact can not be considered in CSI calculation. Therefore, the operation proposed in 4-3 can be applied to the case where the frequency density 2 triggers the maximum overhead on the frequency axis.

[0797] 3-2. The time axis pattern / density of PT-RS can be determined according to the MCS scheduled to the terminal, and when the MCS is low, the time axis density can be configured to be low. Therefore, the proposed operation can be applied to the case where the time density 1 triggers the maximum overhead on the time axis.

[0798] 3-3. As in the example, for frequency density 2 / time density 1, 28 REs of overhead can be generated by 2-port PT-RS per 2 RBs. It can be approximately expressed as 14 REs / RB based on the terminal scheduling bandwidth.

[0799] In the current standard, the number of additional DMRSs is also included in the definition of the CSI reference resource, and 14 REs / RB can be considered as the overhead corresponding to one additional DMRS, and thus it can be considered as the effective overhead that should be considered in CSI calculation.

[0800] In other words, when the above conditions are indicated and / or satisfied implicitly or explicitly, the terminal can be considered as an effective overhead that should be considered in performing CSI calculation on 2-port PT-RS. In other words, the terminal can assume the presence of the above REs (or symbols) of 2-port PT-RS in the CSI reference resource and derive CQI index (and / or PMI, RI) based thereon.

[0801] The time / frequency density of PT-RS can be configured based on timeDensity and frequencyDensity in higher layer parameter PTRS-DownlinkConfig. Each of timeDensity and frequencyDensity can indicate threshold values ptrs-MCSi (i=1, 2, 3) and NRB,i (i=0, 1), respectively.

[0802] The operations in the above proposals 1 to 4 can be independently applied and implemented by the wireless communication device. Alternatively, at least one or more operations in the above proposals 1 to 4 can be combined and implemented by the wireless communication device.

[0803] Figure 32 FIG. 1 is a diagram illustrating a method for transmitting and receiving channel state information according to an embodiment of the disclosure.

[0804] Figure 31 Signaling between a network (e.g., TRP 1, TRP 2) and a UE in case of multiple TRPs (i.e., M-TRP or multiple cells) (hereinafter, all TRPs can be replaced with cells) in which the methods proposed in the disclosure (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) can be applied is illustrated. Here, the UE / network is merely an example and can be replaced with various devices as described in Figure 31 and Figure 32 may be applied by replacing with various devices as described in Figure 31 The above-described various embodiments are merely for facilitating description and do not limit the scope of the disclosure. In addition, some steps shown in the above-described various embodiments can be omitted according to circumstances and / or configurations, etc. Figure 31

[0805] Referring to Figure 32 ​For ease of description, signaling between 2 TRPs and a UE is considered, but it is self-evident that a corresponding signaling method can be extended and applied to signaling between multiple TRPs and multiple UEs. In the following description, the network can be one base station including multiple TRPs, or can be one cell including multiple TRPs. In an example, ideal / non-ideal backhaul can be configured between TRP 1 and TRP 2 configuring 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 transmitting a signal to TRP 1 / TRP 2 can be interpreted / described (or can be an operation) as the operation of the terminal transmitting a signal to the network (through / using TRP 1 / TRP 2), or can be interpreted / described in reverse.

[0806] In addition, in the following description, it is described based on "TRP", but as described above, it can be applied by replacing with an expression such as panel, antenna array, cell (e.g., macro cell / small cell / pico cell, etc.), TP (transmission point), base station (gNB, etc.), etc. As described above, the TRP can be classified according to information (e.g., index, identifier (ID)) on the CORESET group (or CORESET pool) (e.g., CORESETpoolIndex). In an example, when one terminal is configured to perform transmission and reception with multiple TRPs (or cells), this can be expressed as one terminal configuring multiple CORESET groups (or CORESET pools). Such configuration of the CORESET group (or CORESET pool) can be performed through higher layer signaling (e.g., RRC signaling, etc.). In addition, the base station can generally mean an object that performs transmission and reception of data with the terminal. For example, the base station can be a concept including one or more TPs (transmission points), one or more TRPs (transmission and reception points), etc. In addition, the TP and / or TRP can include a panel, a transmission and reception unit, etc. of the base station.

[0807] The UE can receive a configuration (i.e., configuration information) from the network through / using TRP 1 and / or TRP 2 (S2801).

[0808] Here, the configuration (i.e., configuration information) can include system information (SI) and / or scheduling information and / or CSI-related configuration (e.g., CSI reporting setting, CSI-RS resource setting, etc.). Further, the configuration (i.e., configuration information) can also include information related to network configuration (i.e., TRP configuration), resource information (resource allocation) related to multi-TRP based transmission and reception, configuration related to priority rule, etc. The configuration (i.e., configuration information) can be transmitted to higher layer signaling (e.g., RRC or MAC CE). In addition, when the configuration information is predefined or pre-configured, the corresponding step can be omitted.

[0809] For example, the configuration (i.e., configuration information) can include CORESET-related configuration information (e.g., ControlResourceSet IE) as described in the above methods (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). The CORESET-related configuration information can include CORESET-related ID (e.g., controlResourceSetID), index of CORESET pool for CORESET (e.g., CORESETPoolIndex), time / frequency resource configuration of CORESET, TCI information related to CORESET, etc. CORESETPoolIndex corresponding to each TRP can be configured differently. For example, the configuration information can include PT-RS-related configuration (e.g., PhaseTrackingRS / PTRS-DownlinkConfig / timedensity / frequencydensity, etc.).

[0810] For example, the configuration (i.e., configuration information) can include configuration / indication value for CSI computation / acquisition / reporting considering multi-TRP transmission based on the above proposals (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0811] For example, as in Proposal 1, a plurality of resource groups (a plurality of resources when only 1 resource is configured in a group) can be configured in one resource set (or resource setting) based on configuration (i.e., configuration information). In addition, the number of TRPs (i.e., the number of TRPs (the value of M, M can be equal to or greater than 1), etc.) to which the resources in one resource set correspond can be configured based on configuration (i.e., configuration information). In addition, N resource groups can be configured based on configuration (i.e., configuration information). In addition, resource candidates and / or combinations of resource candidates in M resources can be configured based on configuration (i.e., configuration information). Furthermore, (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 configuration (i.e., configuration information). In addition, the number of CSIs (i.e., the number of CSI sets (the value of N), etc.) that should be reported by the UE can be configured based on configuration (i.e., configuration information). Furthermore, the configuration (i.e., configuration information) can include information on the number of CSIs that should be reported by the UE. In addition, the configuration (i.e., configuration information) can include information on a CSI-IM (interference measurement) resource set for interference measurement.

[0812] For example, as in Proposal 2, a plurality of resource sets can be configured in one resource setting based on configuration (i.e., configuration information). In addition, the number of TRPs (i.e., the number of TRPs (the value of M, M can be equal to or greater than 1), etc.) to which the resource sets in one resource setting correspond can be configured based on configuration (i.e., configuration information). In addition, N resource sets can be configured based on configuration (i.e., configuration information). In addition, resource set candidates and / or combinations of resource set candidates in M resource sets can be configured based on configuration (i.e., configuration information). Furthermore, (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 configuration (i.e., configuration information). In addition, the number of CSIs (i.e., the number of CSI sets (the value of N), etc.) that should be reported by the UE can be configured based on configuration (i.e., configuration information). In addition, the configuration (i.e., configuration information) can include information on the number of CSIs that should be reported by the UE. In addition, the configuration (i.e., configuration information) can include information on a CSI-IM (interference measurement) resource set for interference measurement.

[0813] In addition, furthermore, the configuration (i.e., configuration information) can include information necessary to perform the operations in the above-described Proposal 1 to Proposal 4.

[0814] For example, in the above-described step S2801, the operation of transmitting and receiving the configuration (i.e., configuration information) can be performed by the following Figure 31 and Figure 28This is achieved using the devices described. 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, etc., to receive configuration, and one or more transceivers 106 can receive configuration from the network.

[0815] The UE can receive RS (e.g., SSB / CSI-RS / TRS / PT-RS) for measuring channel states from the network via / using TRP 1 and / or TRP 2 (S2802). For example, when receiving RS via / using multiple TRPs, information about the relationships between RSs can be received.

[0816] Here, the UE can receive RS in resources configured based on the configuration (i.e., configuration information) received in step S2801.

[0817] The UE can receive instructions regarding CSI reports from the network via / using TRP 1 and / or TRP 2 (S2803). For example, for non-periodic CSI reports, the instructions can be executed by triggering a CSI report in the DCI. Alternatively, for semi-persistent / periodic CSI reports, step S2803 can be omitted. Furthermore, steps S2802 and S2803 can be reversed or combined into a single step.

[0818] For example, the operations of RS for measuring the channel state in steps S2802 and / or S2803 above, and / or for sending and receiving instructions on triggering a CSI report, can be described below. Figure 28 and Figures 31 to 32 The device implementation in [the document / reference]. Figure 28 One or more processors 102 may control one or more transceivers 106 and / or one or more memories 104, etc., to receive instructions on triggering CSI reports and / or RS for measuring channel states, and one or more transceivers 106 may receive instructions on triggering CSI reports and / or RS for measuring channel states from the network.

[0819] The UE can perform CSI measurements based on information from the network configuration and RS (e.g., the configuration in step S2801, information via DCI, etc.) (S2804).

[0820] Here, the UE can perform CSI measurements that take into account multiple TRP transmissions.

[0821] For example, the above proposals (e.g., proposal 1 / proposal 2 / proposal 3 / proposal 4, etc.) can be based on when the UE performs CSI measurements.

[0822] For example, CSI for one TRP can be calculated by considering RS of other TRPs, etc. For example, CSI entries (e.g., CRI / RI / PMI / LI / CQI, etc.) for each TRP can be configured differently. For example, CSI for one TRP can be determined / calculated based on CSI for other TRPs. For example, the UE can perform CSI measurement considering multi-TRP transmission based on time behavior / resource setting related to CSI, etc.

[0823] For example, based on Proposal 1, assuming a case where only one resource is configured in each resource group.

[0824] M (M is a natural number) CSI-RS resources can be selected from the set of CSI-RS resources 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, by the configuration information in step S2801, a CSI-RS resource candidate and / or a combination of CSI-RS resource candidates in the M CSI-RS resources can be configured, and the N CSI-RS resources can be selected from the CSI-RS resource candidate and / or the combination of CSI-RS resource candidates. Here, the CSI can 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 for channel measurement and the remaining N-1 CSI-RS resources for interference measurement.

[0825] In another example, based on Proposal 1, one resource set can include M (M is a natural number) CSI-RS resource groups (here, each CSI-RS resource group can correspond to a separate TRP), and N CSI-RS resource groups can be determined by configuration information or a predetermined rule, from the M CSI-RS resource groups. Here, the CSI can 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 in the N CSI sets can 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 for interference measurement except for the nth CSI-RS resource group. In other words, 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 can be used for channel measurement, and a specific CSI-RS resource in the remaining CSI-RS resource groups except for the nth CSI-RS resource group can be used for interference measurement.

[0826] In addition, the CSI can 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 among M CSI-RS resource groups. In other words, the CSI can include one or more CSI sets for a single TRP.

[0827] In addition, for the N CSI-RS resource (or resource group) or the CSI-RS resource combination in the N CSI-RS resource group, a reference signal of a QCL (Quasi Co-Location) type for different spatial Rx parameters can be configured.

[0828] In addition, the configuration information in step S2801 can include information on a CSI-IM (Interference Measurement) resource (or resource set) for interference measurement, and a specific CSI-RS resource combination among the N CSI-RS resource groups can be mapped to the same CSI-IM resource.

[0829] In addition, a layer indicator (LI) can be independently derived / reported for the N CSI sets by the CSI. In other words, the LI can be independently reported per N CSI-RS resource combination (or CSI-RS resource group). Here, the number of derived / reported LIs can be determined based on the maximum number of ports of a phase tracking reference signal (PTRS) configured in the terminal. In addition, when the number of CSI processing units (CPUs) required for calculating the CSI is calculated (counted), the CSI set based on a single CSI resource and the CSI set based on the CSI-RS resource combination can be considered separately. For example, the CSI can include a first CSI set based on a single CSI resource in a CSI resource set and / or a second CSI set based on a CSI-RS resource combination in the CSI 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 (or twice the number of combinable CSI-RS resource combinations) that can be combined from the M CSI-RS resource groups. In addition, based on N' CSI-RS resource combinations among 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 among the N CSI-RS resource groups (or twice the number of N' CSI-RS resource combinations among the N CSI-RS resource groups).

[0830] In addition, the CSI reporting based on the CSI-RS resource combination (i.e., the CSI reporting for the multi-TRP transmission) can be prioritized over the CSI reporting based on the single CSI-RS resource (i.e., the CSI reporting for the single-TRP transmission), which can conflict. Alternatively, the CSI reporting based on the single CSI-RS resource can be prioritized over the CSI reporting based on the CSI-RS resource combination, which can conflict. In addition, the priority of the transmission can 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 can be configured through the configuration in step S2801.

[0831] In addition, for example, the CSI computation time for the CSI measurement for the mTRP (e.g., TRP 1 / TRP 2) can be determined based on the method described in Proposal #3 above. In this example, the CSI computation time for the CSI reporting based on the CSI-RS resource combination can be determined by adding time based on the parameter value related to the CSI computation time configured for the CSI reporting based on the single CSI-RS resource.

[0832] For example, the CSI reference resource for the CSI measurement for the mTRP (e.g., TRP 1 / TRP 2) can be determined based on the method described in Proposal #4 above. For example, the CSI reference resource can be defined by taking into account the overhead of N (e.g., 2) port PT-RS. In other words, in this example, in order to derive the CSI, it can be assumed that there are resource elements for 2 or more ports of the PTRS in the CSI reference resource. For example, whether to determine the CSI reference resource can be implicitly / explicitly indicated by taking into account the overhead of N (e.g., 2) port PT-RS. The indication can be based on the maximum number of PT-RS ports / number of LI values to be reported / bandwidth range / CQI-related parameters / PT-RS-related time density / frequency density, etc.

[0833] For example, the operation of measuring the channel state information in step S2804 above can be implemented by the device in Figures 31 to 32 and Figure 31 For example, with reference to Figure 29 , the one or more processors 102 can control the one or more transceivers 106 and / or the one or more memories 104, etc., to perform the channel state measurement.

[0834] The UE can report the CSI to the network through / with the TRP 1 and / or the TRP 2 (S2805).

[0835] For example, the CSI reporting operation can be performed based on the description in the above CSI report. For example, as described in the above proposals (Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.), the CSI can be MTRP CSI or STRP CSI. For example, the channel / resource for CSI feedback can overlap / conflict, and in this case, the CSI can be reported in descending order of priority based on the priority rule described in the above proposals (Proposal 1 / 2). For example, the priority rule can be based on whether it is MTRP CSI or STRP CSI / content of CSI (e.g., CRI / RI / PMI / CQI / LI / RSRP / SINR) / number of MTRPs associated with CSI, etc. In an example, MTRP CSI can have a higher priority than STRP CSI. In an example, BM-related CSI can have a higher priority than other CSI. In an example, the priority can be determined in the order of BM-related MTRP CSI, BM-related STRP CSI, non-BM MTRP CSI, non-BM STRP CSI. For example, dropping / puncturing / rate matching can be performed for CSI with low priority.

[0836] For example, the operation of transmitting and receiving the CSI in the above step S2805 can be implemented by the device in Figure 29 and Figure 29 to be described below. For example, referring to Figure 29 , the one or more processors 102 can control the one or more transceivers 106 and / or the one or more memories 104, etc., to report the CSI, and the one or more transceivers 106 can transmit the CSI to the network.

[0837] The UE can receive data scheduling information and / or data / RS (for data decoding) based on the scheduling information from the network through / with the TRP 1 and / or the TRP 2 (S2806). In this case, the data scheduling and precoding to be applied to the data can be determined / calculated by the base station based on the CSI reported by the terminal, but can not consider only the CSI reported by the terminal.

[0838] For example, the operation of transmitting and receiving the data scheduling information and / or data / RS based on the data scheduling information in the above step S2806 can be implemented by the device in Figure 29 and Figure 31 to be described below. For example, referring to Figure 32 , the one or more processors 102 can control the one or more transceivers 106 and / or the one or more memories 104, etc., to receive the data scheduling information and / or data / RS based on the scheduling information, and the one or more transceivers 106 can receive the data scheduling information and / or data / RS based on the data scheduling information from the network.

[0839] As described above, the above-described signaling and operations between the network and the UE (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4 and Figure 31 ) can be implemented by the apparatuses (e.g., Figure 30 and 32 ) to be described below.

[0840] For example, the above-described signaling and operations between the network and the UE (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4 and Figure 30 ) can be processed by one or more processors (102, 202) in Figure 30 , and the above-described network side / UE signaling and operations (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4 and Figure 30 ) can be stored in the form of commands / programs (e.g., instructions, executable codes) for driving at least one processor (e.g., 102, 202) in Figure 30 in a memory (e.g., one or more memories 104, 204) in Figure 31 .

[0841] Figure 32 is a diagram illustrating an operation of a terminal for transmitting channel state information according to an embodiment of the disclosure.

[0842] Figure 31 The operation of the terminal based on Proposal 1 to Proposal 4 is illustrated. General devices to which the present disclosure can be applied The examples in Figure 31 are for ease of description and do not limit the scope of the disclosure. Some of the steps shown in Figure 31 may be omitted according to circumstances and / or configurations. In addition, in Figure 32 , the terminal is only one example and can be implemented by the apparatuses shown in Figure 32 below. For example, the processor 102 / 202 in ​ may be controlled to transmit and receive channels / signals / data / information, etc. by using the transceiver 106 / 206, and can be controlled to store channels / signals / data / information, etc. to be transmitted or received in the memory 104 / 204.

[0843] The terminal receives configuration information related to CSI from the base station (S2901).

[0844] The configuration information related to CSI can include configuration / indication values for considering multi-TRP transmission for CSI calculation / acquisition / reporting based on the above-described proposals (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0845] For example, as in Proposal 1, multiple resource groups (multiple resources when only 1 resource is configured in a group) can be configured in one resource set (or resource setting) based on configuration (i.e., configuration information). In addition, the number of TRPs (i.e., the number of TRPs (value of M, M can be equal to or greater than 1), etc.) to which the resources in one resource set correspond can be configured based on configuration (i.e., configuration information). In addition, N resource groups can be configured based on configuration (i.e., configuration information). In addition, resource candidates in M resources and / or combinations of resource candidates can be configured based on configuration (i.e., configuration information). Furthermore, (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 configuration (i.e., configuration information). In addition, the number of CSIs (i.e., the number of CSI sets (value of N), etc.) that should be reported by the UE can be configured based on configuration (i.e., configuration information). In addition, the configuration (i.e., configuration information) can include information on the number of CSIs that should be reported by the UE. In addition, the configuration (i.e., configuration information) can include information on a CSI-IM (interference measurement) resource set for interference measurement.

[0846] For example, as in Proposal 2, multiple resource sets can be configured in one resource setting based on configuration (i.e., configuration information). In addition, the number of TRPs (i.e., the number of TRPs (value of M, M can be equal to or greater than 1), etc.) to which the resource sets in one resource setting correspond can be configured based on configuration (i.e., configuration information). In addition, N resource sets can be configured based on configuration (i.e., configuration information). In addition, resource set candidates in M resource sets and / or combinations of resource set candidates can be configured based on configuration (i.e., configuration information). Furthermore, (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 configuration (i.e., configuration information). In addition, the number of CSIs (i.e., the number of CSI sets (value of N), etc.) that should be reported by the UE can be configured based on configuration (i.e., configuration information). In addition, the configuration (i.e., configuration information) can include information on the number of CSIs that should be reported by the UE. In addition, the configuration (i.e., configuration information) can include information on a CSI-IM (interference measurement) resource set for interference measurement.

[0847] In addition, furthermore, the configuration (i.e., configuration information) can include information necessary to perform the operations in the above-mentioned Proposal 1 to Proposal 4.

[0848] The terminal receives a CSI-RS (CSI reference signal) from the base station (S2902).

[0849] The terminal can receive a CSI-RS in a CSI-RS resource configured based on the configuration information received in step S2901.

[0850] Here, the CSI-RS is one example, and can be replaced with an RS for channel state measurement (e.g., SSB / CSI-RS / TRS / PT-RS).

[0851] The terminal transmits CSI to the base station based on the configuration information and the CSI-RS (S2903).

[0852] Here, the terminal can perform CSI measurement considering multi-TRP transmission, and report the measured CSI to the base station.

[0853] For example, the above proposals (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) can be based on when the terminal performs CSI measurement.

[0854] For example, when assuming a case where only one resource is configured in each resource gro...

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, configuration information related to channel state information (CSI) resource settings, wherein the configuration information includes information on a CSI-reference signal (CSI-RS) resource set; receiving, from the base station, a CSI-RS; and transmitting, to the base station, the CSI derived using the CSI-RS, wherein the CSI-RS resource set is configured with a first resource group, a second resource group, and N (N is a natural number) resource pairs, wherein the CSI includes i) one CSI-RS resource indicator (CRI) corresponding to one resource pair of the N resource pairs, and ii) two precoding matrix indicators (PMIs) respectively associated to a first resource of the first resource group and a second resource of the second resource group of the one resource pair, wherein the two PMIs for the one resource pair are derived based on the one CRI for the one resource pair, and wherein, to derive a PMI for the first resource, interference from the second resource of the one resource pair is derived.

2. The method of claim 1, wherein, reporting a layer indicator (LI) independently for the N resource pairs.

3. The method of claim 2, wherein, determining a number of the LI based on a maximum number of ports of a phase tracking reference signal (PTRS) configured in the UE.

4. The method of claim 1, wherein, configuring the N resource pairs that should be computed by the UE by the configuration information.

5. The method of claim 1, wherein, the configuration information includes information on a CSI interference measurement (CSI-IM) resource for deriving interference, wherein a particular resource pair is mapped to a same CSI-IM resource.

6. The method of claim 1, wherein, configuring, for one resource pair of the N resource pairs, a quasi co-location (QCL) type reference signal for different spatial Rx parameters.

7. The method of claim 1, wherein, determining a CSI computation time for a CSI report based on the N resource pairs by adding an additional time based on a parameter value related to a CSI computation time configured for a CSI report based on a single CSI-RS resource.

8. The method of claim 1, wherein, to derive the CSI, assuming that there are resource elements for 2 or more ports of a phase tracking reference signal (PTRS) in a CSI reference resource. 9.A user equipment (UE) operating in a wireless communication system, the UE comprising: at least one transceiver for transmitting and receiving a wireless signal; and at least one processor for controlling the at least one transceiver, wherein the at least one processor is configured to: receive, from a base station, configuration information related to channel state information (CSI) resource settings, wherein the configuration information includes information on a CSI-reference signal (CSI-RS) resource set; receive, from the base station, a CSI-RS; and transmit, to the base station, the CSI derived using the CSI-RS, wherein the CSI-RS resource set is configured with a first CSI-RS resource group, a second resource group, and N (N is a natural number) resource pairs, ​ wherein the CSI comprises i) one CSI-RS resource indicator (CRI) corresponding to one of the N resource pairs, and ii) two precoding matrix indicators (PMIs) respectively associated to a first resource of the first resource group and a second resource of the second resource group of the one resource pair, wherein the two PMIs for the one resource pair are derived based on the one CRI for the one resource pair, and wherein, to derive a PMI for the first resource, interference from the second resource of the one resource pair is derived. 10.A base station operating in a wireless communication system, the base station comprising: at least one transceiver for transmitting and receiving a wireless signal; and at least one processor for controlling the at least one transceiver, wherein the at least one processor is configured to: transmit, to a user equipment (UE), configuration information related to a channel state information (CSI) resource setting, wherein the configuration information includes information on a CSI-reference signal (CSI-RS) resource set; transmit, to the UE, a CSI-RS; and receive, from the UE, a CSI derived using the CSI-RS, wherein the CSI-RS resource set is configured with a first resource group, a second resource group, and N (N is a natural number) resource pairs, wherein the CSI comprises i) one CSI-RS resource indicator (CRI) corresponding to one of the N resource pairs, and ii) two precoding matrix indicators (PMIs) respectively associated to a first resource of the first resource group and a second resource of the second resource group of the one resource pair, wherein the two PMIs for the one resource pair are derived based on the one CRI for the one resource pair, and wherein, to derive a PMI for the first resource, interference from the second resource of the one resource pair is derived. 11.A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a user equipment (UE), configuration information related to a channel state information (CSI) resource setting, wherein the configuration information includes information on a CSI-reference signal (CSI-RS) resource set; transmitting, to the UE, a CSI-RS; and receiving, from the UE, a CSI derived using the CSI-RS, wherein the CSI-RS resource set is configured with a first resource group, a second resource group, and N (N is a natural number) resource pairs, wherein the CSI comprises i) one CSI-RS resource indicator (CRI) corresponding to one of the N resource pairs, and ii) two precoding matrix indicators (PMIs) respectively associated to a first resource of the first resource group and a second resource of the second resource group of the one resource pair, wherein the two PMIs for the one resource pair are derived based on the one CRI for the one resource pair, and wherein, to derive a PMI for the first resource, interference from the second resource of the one resource pair is derived. wherein, for deriving the PMI for the first resource, interference from the second resource of the one resource pair is derived.

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