WO2022031077A1

WO2022031077A1 - Method and device for transmitting and receiving channel state information in wireless communication system

Info

Publication number: WO2022031077A1
Application number: PCT/KR2021/010338
Authority: WO
Inventors: 김규석; 김형태; 강지원
Original assignee: 엘지전자 주식회사
Priority date: 2020-08-06
Filing date: 2021-08-05
Publication date: 2022-02-10

Abstract

Disclosed are a method and a device for transmitting and receiving channel state information in a wireless communication system. 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 a CSI report from a base station; receiving a channel state information-reference signal (CSI-RS) on a plurality of CSI-RS resources from the base station; and transmitting a CSI calculated on the basis of the CSI-RS to the base station. The plurality of CSI-RS resources for channel measurement may be configured by the configuration information related to the CSI report, and on the basis of the configuration information related to the CSI report, the CSI may be calculated on the basis of precoding matrix information and/or the number of individual ranks configured for each of the plurality of CSI-RS resources.

Description

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

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

The mobile communication system has been developed to provide a voice service while ensuring user activity. However, the mobile communication system has expanded its scope to not only voice but also data service. Currently, the explosive increase in traffic causes a shortage of resources and users demand higher-speed services, so a more advanced mobile communication system is required. have.

The requirements of the next-generation mobile communication system are largely to support explosive data traffic acceptance, a dramatic increase in the transmission rate per user, a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. should be able For this purpose, Dual Connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Wideband Various technologies such as wideband support and device networking are being studied.

An object of the present disclosure is to provide a method and apparatus for transmitting and receiving channel state information.

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

In addition, an additional technical task of the present disclosure is to provide a method and apparatus for individually/independently setting the number of ranks and/or a precoding matrix required for calculating channel state information in a terminal for each resource.

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be able

A method for transmitting channel state information (CSI) in a wireless communication system according to an aspect of the present disclosure includes: receiving configuration information related to a CSI report from a base station; receiving a CSI-RS on a plurality of channel state information-reference signal (CSI-RS) resources from the base station; and transmitting the CSI calculated based on the CSI-RS to the base station. The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report, and an individual rank configured for each of the plurality of CSI-RS resources based on the configuration information related to the CSI report ( The CSI may be calculated based on the number of ranks and/or precoding matrix information.

A method of receiving channel state information (CSI) according to an additional aspect of the present disclosure: transmitting configuration information related to CSI reporting to a terminal; transmitting a CSI-RS to the terminal on a plurality of channel state information-reference signal (CSI-RS) resources; and receiving the CSI calculated based on the CSI-RS from the terminal. The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report, and an individual rank configured for each of the plurality of CSI-RS resources based on the configuration information related to the CSI report ( The CSI may be calculated based on the number of ranks and/or precoding matrix information.

According to an embodiment of the present disclosure, it is possible to obtain/report optimal channel state information for performing transmission of multiple transmission reception points (TRPs).

In addition, according to an embodiment of the present disclosure, scheduling more suitable for a channel situation may be performed by acquiring/reporting optimal channel state information for performing transmission of multiple transmission reception points (TRPs).

In addition, according to an embodiment of the present disclosure, wireless communication system performance may be improved by acquiring/reporting optimal channel state information for performing transmission of multiple transmission reception points (TRPs).

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as a part of the detailed description to help understand the present disclosure, provide embodiments of the present disclosure, and together with the detailed description, explain the technical features of the present disclosure.

1 illustrates a structure of a wireless communication system to which the present disclosure can be applied.

2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.

3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.

4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.

5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.

6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission/reception method using them.

7 illustrates a multiple TRP transmission scheme in a wireless communication system to which the present disclosure can be applied.

8 illustrates CSI reporting in a wireless communication system to which the present disclosure may be applied.

9 illustrates a CSI reporting procedure according to an embodiment of the present disclosure.

10 illustrates a signaling procedure between a network and a terminal according to an embodiment of the present disclosure.

11 illustrates an operation of a terminal for transmitting channel state information according to an embodiment of the present disclosure.

12 illustrates an operation of a base station for transmitting channel state information according to an embodiment of the present disclosure.

13 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present disclosure.

Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The detailed description set forth below in conjunction with the appended drawings is intended to describe exemplary embodiments of the present disclosure and is not intended to represent the only embodiments in which the present disclosure may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. However, it will be apparent to one of ordinary skill in the art that the present disclosure may be practiced without these specific details.

In some cases, well-known structures and devices may be omitted or shown in block diagram form focusing on core functions of each structure and device in order to avoid obscuring the concepts of the present disclosure.

In the present disclosure, when it is said that a component is "connected", "coupled" or "connected" with another component, it is not only a direct connection relationship, but also an indirect connection relationship in which another component exists between them. may also include. Also in this disclosure the terms “comprises” or “having” specify the presence of a recited feature, step, operation, element and/or component, but one or more other features, steps, operations, elements, components and/or The presence or addition of groups thereof is not excluded.

In the present disclosure, terms such as "first" and "second" are used only for the purpose of distinguishing one component from other components and are not used to limit the components, unless otherwise specified. It does not limit the order or importance between them. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment is referred to as a first component in another embodiment. can also be called

The terminology used in this disclosure is for the description of specific embodiments and is not intended to limit the claims. As used in the description of the embodiments and in the appended claims, the singular form is intended to include the plural form as well, unless the context clearly dictates otherwise. As used herein, the term “and/or” may refer to one of the related enumerations, or is meant to refer to and include any and all possible combinations of two or more thereof. Also, in this disclosure, "/" between words has the same meaning as "and/or" unless otherwise specified.

The present disclosure describes a wireless communication network or a wireless communication system as a target, and operations performed in the wireless communication network control the network and transmit or receive a signal by a device (eg, a base station) having jurisdiction over the wireless communication network. It may be made in the process of receiving (receive), or it may be made in the process of transmitting or receiving a signal from a terminal coupled to a corresponding wireless network to a network or between terminals.

In the present disclosure, transmitting or receiving a channel includes the meaning of transmitting or receiving information or a signal through a corresponding channel. For example, transmitting the control channel means transmitting control information or a signal through the control channel. Similarly, to transmit a data channel means to transmit data information or a signal over the data channel.

Hereinafter, downlink (DL: downlink) means communication from a base station to a terminal, and uplink (UL: uplink) means communication from a terminal to a base station. In the downlink, the transmitter may be a part of the base station, and the receiver may be a part of the terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the base station. The base station may be represented as a first communication device, and the terminal may be represented as a second communication device. Base station (BS) is a fixed station (fixed station), Node B, evolved-NodeB (eNB), gNB (Next Generation NodeB), BTS (base transceiver system), access point (AP: Access Point), network (5G) network), AI (Artificial Intelligence) system/module, RSU (road side unit), robot (robot), drone (UAV: Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device, etc. can be replaced by In addition, the terminal (Terminal) may be fixed or have mobility, UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile) Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), It may be replaced by terms such as a robot, an artificial intelligence (AI) module, an unmanned aerial vehicle (UAV), an augmented reality (AR) device, and a virtual reality (VR) device.

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

For clarity of description, description is based on a 3GPP communication system (eg, LTE-A, NR), but the spirit of the present disclosure is not limited thereto. LTE refers to technology after 3GPP Technical Specification (TS) 36.xxx Release 8. In detail, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE/NR may be referred to as a 3GPP system. "xxx" stands for standard document detail number. LTE/NR may be collectively referred to as a 3GPP system. For backgrounds, terms, abbreviations, etc. used in the description of the present disclosure, reference may be made to matters described in standard documents published before the present disclosure. For example, you can refer to the following documents:

For 3GPP LTE, see TS 36.211 (physical channels and modulation), TS 36.212 (multiplex and channel coding), TS 36.213 (physical layer procedures), TS 36.300 (overall description), TS 36.331 (radio resource control). can

For 3GPP NR, TS 38.211 (physical channels and modulation), TS 38.212 (multiplex and channel coding), TS 38.213 (physical layer procedures for control), TS 38.214 (physical layer procedures for data), TS 38.300 (Overall description of NR and New Generation-Radio Access Network (NG-RAN)), TS 38.331 (Radio Resource Control Protocol Specification) may be referred to.

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

- BM: beam management

- CQI: channel quality indicator (channel quality indicator)

- CRI: channel state information - reference signal resource indicator (channel state information - reference signal resource indicator)

- CSI: channel state information (channel state information)

- CSI-IM: channel state information - interference measurement (channel state information - interference measurement)

- CSI-RS: channel state information - reference signal (channel state information - reference signal)

- DMRS: demodulation reference signal (demodulation reference signal)

- FDM: frequency division multiplexing (frequency division multiplexing)

- FFT: fast Fourier transform

- IFDMA: interleaved frequency division multiple access (interleaved frequency division multiple access)

- IFFT: inverse fast Fourier transform

- L1-RSRP: first layer reference signal received power (Layer 1 reference signal received power)

- L1-RSRQ: first layer reference signal received quality (Layer 1 reference signal received quality)

- MAC: medium access control (medium access control)

- NZP: non-zero power (non-zero power)

- OFDM: orthogonal frequency division multiplexing

- PDCCH: physical downlink control channel (physical downlink control channel)

- PDSCH: physical downlink shared channel (physical downlink shared channel)

- PMI: precoding matrix indicator (precoding matrix indicator)

- RE: resource element

- RI: rank indicator (Rank indicator)

- RRC: radio resource control (radio resource control)

- RSSI: received signal strength indicator (received signal strength indicator)

- Rx: Reception

- QCL: quasi co-location

- SINR: signal to interference and noise ratio

- SSB (or SS / PBCH block): synchronization signal block (including primary synchronization signal (PSS), secondary synchronization signal (SSS: secondary synchronization signal) and physical broadcast channel (PBCH: physical broadcast channel))

- TDM: time division multiplexing

- TRP: transmission and reception point (transmission and reception point)

- TRS: tracking reference signal (tracking reference signal)

- Tx: transmission

- UE: user equipment (user equipment)

- ZP: zero power

system general

As more and more communication devices require greater communication capacity, there is a need for improved mobile broadband communication compared to a conventional radio access technology (RAT). In addition, massive MTC (Machine Type Communications), which provides various services anytime, anywhere by connecting multiple devices and things, is also one of the major issues to be considered in next-generation communication. In addition, a communication system design in consideration of a service/terminal sensitive to reliability and latency is being discussed. As such, the introduction of the next-generation RAT in consideration of enhanced mobile broadband communication (eMBB), massive MTC (Mmtc), and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed, and in the present disclosure, for convenience, the technology is called NR. NR is an expression showing an example of 5G RAT.

A new RAT system including NR uses an OFDM transmission scheme or a similar transmission scheme. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may support a larger system bandwidth (eg, 100 MHz) while following the existing numerology of LTE/LTE-A. Alternatively, one cell may support a plurality of numerologies. That is, terminals operating in different numerology can coexist in one cell.

Numerology corresponds to one subcarrier spacing in the frequency domain. By scaling the reference subcarrier spacing by an integer N, different numerology can be defined.

1, NG-RAN is NG-RA (NG-Radio Access) user plane (ie, new access stratum (AS) sublayer / Packet Data Convergence Protocol (PDCP) / RLC (Radio Link Control) / MAC / PHY) and gNBs that provide control plane (RRC) protocol termination for the UE. The gNBs are interconnected through an Xn interface. The gNB is also connected to a New Generation Core (NGC) through an NG interface. More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and a User Plane Function (UPF) through an N3 interface.

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

Hereinafter, OFDM numerology and frame structure that can be considered in the NR system will be described. A number of OFDM numerologies supported in the NR system may be defined as shown in Table 1 below.

μμ	Δf=2^μ·15 [kHz]Δf=2 ^μ ·15 [kHz]	CP CP
00	1515	일반(Normal)Normal
1One	3030	일반 Normal
22	6060	일반, 확장(Extended)General, Extended
33	120120	일반 Normal
44	240240	일반Normal

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

주파수 범위 지정(Frequency Range designation)Frequency Range designation	해당 주파수 범위(Corresponding frequency range)Corresponding frequency range	서브캐리어 간격(Subcarrier Spacing)Subcarrier Spacing
FR1FR1	410MHz - 7125MHz410MHz - 7125MHz	15, 30, 60kHz15, 30, 60 kHz
FR2FR2	24250MHz - 52600MHz24250MHz - 52600MHz	60, 120, 240kHz60, 120, 240 kHz

Regarding the frame structure in the NR system, the size of various fields in the time domain is expressed as a multiple of the time unit of T _c =1/(Δf _max ·N _f ). Here, Δf _max =480·10 ³ Hz and N _f =4096. Downlink and uplink transmission is organized in a radio frame having a section of T _f =1/(Δf _max N _f /100)·T _c =10ms. Here, each radio frame is T _sf =(Δf _max N _f /1000)·T _c =1msIt consists of 10 subframes having a period of . In this case, one set of frames for uplink and one set of frames for downlink may exist. In addition, transmission in the uplink frame number i from the terminal should start before T _TA = (N _TA +N _TA,offset )T _c than the start of the corresponding downlink frame in the corresponding terminal. For the subcarrier spacing configuration μ, slots are numbered in increasing order of n _s ^μ ∈{0,..., N _slot ^subframe,μ -1} within the subframe, and within the radio frame They are numbered in increasing order of n _s,f ^μ ∈{0,..., N _slot ^frame,μ -1}. One slot consists of consecutive OFDM symbols of N _symb ^slots , and N _symb ^slots are determined according to CP. The start of the slot n _s ^μ in a subframe is temporally aligned with the start of the OFDM symbol n _s ^μ N _symb ^slot in the same subframe. Not all terminals can transmit and receive at the same time, which means that all OFDM symbols of a downlink slot or an uplink slot cannot be used. Table 3 shows the number of OFDM symbols per slot (N _symb ^slot ), the number of slots per radio frame (N _slot ^frame,μ ), and the number of slots per subframe (N _slot ^subframe,μ ) in the general CP, Table 4 denotes 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.

μμ	N_symb ^slot N _symb ^slot	N_slot ^frame,μ N _slot ^{frame, μ}	N_slot ^subframe,μ N _slot ^{subframe, μ}
00	1414	1010	1One
1One	1414	2020	22
22	1414	4040	44
33	1414	8080	88
44	1414	160160	1616

μ μ	N_symb ^slot N _symb ^slot	N_slot ^frame,μ N _slot ^{frame, μ}	N_slot ^subframe,μ N _slot ^{subframe, μ}
22	1212	4040	44

2 is an example of a case where μ=2 (SCS is 60 kHz). Referring to Table 3, one subframe may include four slots. One subframe = {1,2,4} slots shown in FIG. 2 is an example, and the number of slot(s) that can be included in one subframe is defined as shown in Table 3 or Table 4. Also, a mini-slot may contain 2, 4 or 7 symbols, or may contain more or fewer symbols. With respect to a physical resource in an NR system, an antenna port ( antenna port), resource grid (resource grid), resource element (resource element), resource block (resource block), carrier part (carrier part), etc. may be considered. Hereinafter, the physical resources that can be considered in the NR system will be described in detail.

First, with respect to an antenna port, an antenna port is defined such that a channel on which a symbol on an antenna port is carried can be inferred from a channel on which another symbol on the same antenna port is carried. When the large-scale property of a channel carrying a symbol on one antenna port can be inferred from a channel carrying a symbol on another antenna port, the two antenna ports are QC/QCL (quasi co-located or QC/QCL) It can be said that there is a quasi co-location) relationship. Here, the wide range characteristic includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

Referring to FIG. 3 , it is exemplarily described that the resource grid is composed of N _RB ^μ N _sc ^RB subcarriers in the frequency domain and that one subframe is composed of 14·2 ^μ OFDM symbols, but limited to this it is not going to be In an NR system, a transmitted signal is described by one or more resource grids consisting of N _RB ^μ N _sc ^RB subcarriers and OFDM symbols of 2 ^μ N _symb ^(μ) . Here, N _RB ^μ≤N _RB ^max,μ . The N _RB ^max,μ represents the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies. In this case, one resource grid may be configured for each μ and each antenna port p. Each element of the resource grid for μ and antenna port p is referred to as a resource element, and is uniquely identified by an index pair (k,l'). Here, k=0,...,N _RB ^μ N _sc ^RB -1 is an index in the frequency domain, and l'=0,...,2 ^μ N _symb ^(μ) -1 is a symbol in a subframe indicates the location of When referring to a resource element in a slot, an index pair (k,l) is used. Here, l=0,...,N _symb ^μ -1 . A resource element (k,l') for μ and an antenna port p corresponds to a complex value a _k,l' ^(p,μ) . In cases where there is no risk of confusion or if a specific antenna port or numerology is not specified, the indices p and μ may be dropped, so that the complex value is a _k,l' ^(p) or a _k,l' can be In addition, a resource block (RB) is defined as N _sc ^RB = 12 consecutive subcarriers in the frequency domain.

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

- OffsetToPointA for the primary cell (PCell: Primary Cell) downlink represents a frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping the SS/PBCH block used by the UE for initial cell selection. It is expressed in resource block units assuming a 15 kHz subcarrier spacing for FR1 and a 60 kHz subcarrier spacing for FR2.

- absoluteFrequencyPointA indicates the frequency-position of point A expressed as in ARFCN (absolute radio-frequency channel number).

Common resource blocks (common resource blocks) are numbered upwards from 0 in the frequency domain for the subcarrier interval setting μ. The center of subcarrier 0 of common resource block 0 for subcarrier interval setting μ coincides with 'point A'. The relationship between the common resource block number n _CRB ^μ and the resource element (k,l) for the subcarrier interval setting μ in the frequency domain is given by Equation 1 below.

In Equation 1, k is defined relative to point A such that k=0 corresponds to a subcarrier centered on point A. Physical resource blocks are numbered from 0 to N _BWP,i ^size,μ -1 in the bandwidth part (BWP: bandwidth part), and i is the number of the BWP. The relationship between the physical resource block n _PRB and the common resource block n _CRB in BWP i is given by Equation 2 below.

N _BWP,i ^start,μ is a common resource block in which BWP starts relative to common resource block 0.

4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied. And, FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.

4 and 5, a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot includes 6 symbols.

The carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined as a plurality of contiguous (physical) resource blocks in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.). A carrier wave may include a maximum of N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated for one terminal. Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.

The NR system may support up to 400 MHz per one component carrier (CC). If a terminal operating in such a wideband CC always operates with a radio frequency (RF) chip for the entire CC turned on, battery consumption of the terminal may increase. Alternatively, when considering multiple use cases (eg, eMBB, URLLC, Mmtc, V2X, etc.) operating within one broadband CC, different numerology (eg, subcarrier spacing, etc.) is supported for each frequency band within the CC. can be Alternatively, the capability for the maximum bandwidth may be different for each terminal. In consideration of this, the base station may instruct the terminal to operate only in a partial bandwidth rather than the entire bandwidth of the broadband CC, and the partial bandwidth is defined as a bandwidth part (BWP: bandwidth part) for convenience. The BWP may consist of consecutive RBs on the frequency axis, and may correspond to one numerology (eg, subcarrier interval, CP length, slot/mini-slot interval).

On the other hand, the base station may set a plurality of BWPs even within one CC configured for the terminal. For example, in the PDCCH monitoring slot, a BWP occupying a relatively small frequency domain may be configured, and a PDSCH indicated by the PDCCH may be scheduled on a larger BWP. Alternatively, when UEs are concentrated in a specific BWP, some UEs may be configured as a different BWP for load balancing. Alternatively, in consideration of frequency domain inter-cell interference cancellation between neighboring cells, a part of the entire bandwidth may be excluded and both BWPs may be configured in the same slot. That is, the base station may configure at least one DL/UL BWP to the terminal associated with the broadband CC. The base station may activate at least one DL/UL BWP among the DL/UL BWP(s) configured at a specific time (by L1 signaling, MAC CE (Control Element) or RRC signaling, etc.). In addition, the base station may indicate switching to another configured DL/UL BWP (by L1 signaling or MAC CE or RRC signaling, etc.). Alternatively, when the timer value expires based on the timer, it may be switched to a predetermined DL/UL BWP. In this case, the activated DL/UL BWP is defined as an active DL/UL BWP. However, since the terminal may not receive the configuration for the DL/UL BWP in a situation such as when the terminal is performing an initial access process or before the RRC connection is set up, in this situation, the terminal This assumed DL/UL BWP is defined as the first active DL/UL BWP.

In a wireless communication system, a terminal receives information from a base station through a downlink, and the terminal transmits information to a base station through an uplink. Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist according to the type/use of the information they transmit and receive.

When the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S601). To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization channel (SSS) from the base station to synchronize with the base station, and to obtain information such as a cell identifier (ID: Identifier). can Thereafter, the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain intra-cell broadcast information. Meanwhile, the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.

After completing the initial cell search, the UE acquires more specific system information by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) according to information carried on the PDCCH. It can be done (S602).

On the other hand, when there is no radio resource for first accessing the base station or for signal transmission, the terminal may perform a random access procedure (RACH) for the base station (steps S603 to S606). To this end, the UE transmits a specific sequence as a preamble through a Physical Random Access Channel (PRACH) (S603 and S605), and receives a response message to the preamble through the PDCCH and the corresponding PDSCH ( S604 and S606). In the case of contention-based RACH, a contention resolution procedure may be additionally performed.

After performing the procedure as described above, the UE performs PDCCH/PDSCH reception (S607) and a physical uplink shared channel (PUSCH)/physical uplink control channel (PUCCH) as a general uplink/downlink signal transmission procedure. Physical Uplink Control Channel) transmission (S608) may be performed. In particular, the UE receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and has a different format depending on the purpose of its use.

On the other hand, the control information that the terminal transmits to the base station through the uplink or the terminal receives from the base station is a downlink/uplink ACK/NACK (Acknowledgment/Non-Acknowledgment) signal, a channel quality indicator (CQI), and a precoding matrix (PMI). Indicator), RI (Rank Indicator), and the like. In the case of the 3GPP LTE system, the UE may transmit the above-described control information such as CQI/PMI/RI through PUSCH and/or PUCCH.

Table 5 shows an example of a DCI format in the NR system.

DCI 포맷DCI format	활용uses
0_00_0	하나의 셀 내 PUSCH의 스케줄링Scheduling of PUSCH in one cell
0_10_1	하나의 셀 내 하나 또는 다중 PUSCH의 스케줄링, 또는 UE에게 셀 그룹(CG: cell group) 하향링크 피드백 정보의 지시Scheduling of one or multiple PUSCHs in one cell, or indication of cell group (CG) downlink feedback information to the UE
0_20_2	하나의 셀 내 PUSCH의 스케줄링Scheduling of PUSCH in one cell
1_01_0	하나의 DL 셀 내 PDSCH의 스케줄링Scheduling of PDSCH in one DL cell
1_11_1	하나의 셀 내 PDSCH의 스케줄링Scheduling of PDSCH in one cell
1_21_2	하나의 셀 내 PDSCH의 스케줄링Scheduling of PDSCH in one cell

Referring to Table 5, DCI formats 0_0, 0_1 and 0_2 are resource information related to PUSCH scheduling (eg, UL/SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block ( TB: Transport Block) related information (eg, MCS (Modulation Coding and Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), HARQ (Hybrid - Automatic Repeat and request) related information (eg, , process number, DAI (Downlink Assignment Index), PDSCH-HARQ feedback timing, etc.), multi-antenna related information (eg, DMRS sequence initialization information, antenna port, CSI request, etc.), power control information (eg, PUSCH power control, etc.), and control information included in each DCI format may be predefined. DCI format 0_0 is used for scheduling PUSCH in one cell. Information included in DCI format 0_0 is cyclic redundancy check (CRC) by Cell Radio Network Temporary Identifier (C-RNTI) or Configured Scheduling RNTI (CS-RNTI) or Modulation Coding Scheme Cell RNTI (MCS-C-RNTI). ) is scrambled and transmitted.

DCI format 0_1 is used to indicate to the UE the scheduling of one or more PUSCHs or configured grant (CG: configure grant) downlink feedback information in one cell. Information included in DCI format 0_1 is CRC scrambled and transmitted by C-RNTI or CS-RNTI or SP-CSI-RNTI (Semi-Persistent CSI RNTI) or MCS-C-RNTI.

DCI format 0_2 is used for scheduling PUSCH in one cell. Information included in DCI format 0_2 is CRC scrambled and transmitted by C-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI.

Next, DCI formats 1_0, 1_1 and 1_2 are resource information related to PDSCH scheduling (eg, frequency resource allocation, time resource allocation, virtual resource block (VRB)-physical resource block (PRB) mapping, etc.), transport block (TB) related information (eg, MCS, NDI, RV, etc.), HARQ related information (eg, process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (eg, antenna port) , transmission configuration indicator (TCI), sounding reference signal (SRS) request, etc.), PUCCH-related information (eg, PUCCH power control, PUCCH resource indicator, etc.), and control information included in each DCI format is It can be predefined.

DCI format 1_0 is used for scheduling the PDSCH in one DL cell. Information included in DCI format 1_0 is CRC scrambled and transmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI.

DCI format 1_1 is used for scheduling PDSCH in one cell. Information included in DCI format 1_1 is CRC scrambled and transmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI.

DCI format 1_2 is used for scheduling PDSCH in one cell. Information included in DCI format 1_2 is CRC scrambled and transmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI.

CSI-related behavior

In a New Radio (NR) system, a channel state information-reference signal (CSI-RS) is a time and/or frequency tracking (time/frequency tracking), CSI calculation (computation), L1 (layer 1)-reference signal received (RSRP) power) is used for computation and mobility. Here, the CSI computation is related to the CSI acquisition (acquisition), the L1-RSRP computation is related to the beam management (beam management, BM).

CSI (channel state information) refers to information that can indicate the quality of a radio channel (or link) formed between a terminal and an antenna port.

- In order to perform one of the uses of CSI-RS as described above, a terminal (eg, user equipment, UE) transmits configuration information related to CSI to a base station (eg, general Node) through radio resource control (RRC) signaling. B, gNB).

The CSI-related configuration information includes CSI-IM (interference management) resource-related information, CSI measurement configuration-related information, CSI resource configuration-related information, CSI-RS resource-related information. Alternatively, it may include at least one of CSI report configuration related information.

i) CSI-IM resource-related information may include CSI-IM resource information, CSI-IM resource set information, and the like. The 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.

ii) CSI resource configuration related information may be expressed as a CSI-ResourceConfig IE. CSI resource configuration related information defines a group including at least one of a non zero power (NZP) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resource set. That is, the CSI resource configuration related information includes a CSI-RS resource set list, and the CSI-RS resource set list is at least one of a NZP CSI-RS resource set list, a CSI-IM resource set list, or a CSI-SSB resource set list. may contain one. The CSI-RS resource set is identified by the 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.

As shown in Table 6 below, parameters indicating the use of CSI-RS for each NZP CSI-RS resource set (eg, BM-related 'repetition' parameter, tracking-related 'trs-Info' parameter) may be set.

Table 6 illustrates an NZP CSI-RS resource set information element (IE: information element) for NZP CSI-RS resource set configuration.

-- ASN1START
-- TAG-NZP-CSI-RS-RESOURCESET-START
NZP-CSI-RS-ResourceSet ::= SEQUENCE {
nzp-CSI-ResourceSetId NZP-CSI-RS-ResourceSetId,
nzp-CSI-RS-Resources SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId,
repetition ENUMERATED { on, off } OPTIONAL,
aperiodicTriggeringOffset INTEGER(0..4) OPTIONAL, -- Need S
trs-Info ENUMERATED {true} OPTIONAL, -- Need R
...
}

-- TAG-NZP-CSI-RS-RESOURCESET-STOP
-- ASN1STOP

And, the repetition parameter corresponding to the upper layer parameter corresponds to 'CSI-RS-ResourceRep' of the first layer (L1: layer 1) parameter.

iii) CSI reporting configuration (report configuration) related information includes a report configuration type (reportConfigType) parameter indicating a time domain behavior and a report Quantity (reportQuantity) parameter indicating a CSI related quantity for reporting. The time domain behavior may be periodic, aperiodic or semi-persistent.

CSI report configuration related information may be expressed as a CSI-ReportConfig IE, and Table 7 below shows an example of the CSI-ReportConfig IE.

-- ASN1START
-- TAG-CSI-RESOURCECONFIG-START

CSI-ReportConfig ::= SEQUENCE {
reportConfigId CSI-ReportConfigId,
carrier ServCellIndex OPTIONAL, -- Need S
resourcesForChannelMeasurement CSI-ResourceConfigId,
csi-IM-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, -- Need R
nzp-CSI-RS-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, -- Need R
reportConfigType CHOICE {
periodic SEQUENCE {
reportSlotConfig CSI-ReportPeriodicityAndOffset,
pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource
},
semiPersistentOnPUCCH SEQUENCE {
reportSlotConfig CSI-ReportPeriodicityAndOffset,
pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource
},
semiPersistentOnPUSCH SEQUENCE {
reportSlotConfig ENUMERATED {sl5, sl10, sl20, sl40, sl80, sl160, sl320},
reportSlotOffsetList SEQUENCE (SIZE (1.. maxNrofUL-Allocations)) OF INTEGER(0..32),
p0alpha P0-PUSCH-AlphaSetId
},
aperiodic SEQUENCE {
reportSlotOffsetList SEQUENCE (SIZE (1..maxNrofUL-Allocations)) OF INTEGER(0..32)
}
},
reportQuantity CHOICE {
none NULL,
cri-RI-PMI-CQI NULL;
cri-RI-i1 NULL;
cri-RI-i1-CQI SEQUENCE {
pdsch-BundleSizeForCSI ENUMERATED {n2, n4} OPTIONAL
},
cri-RI-CQI NULL,
cri-RSRP NULL,
ssb-Index-RSRP NULL,
cri-RI-LI-PMI-CQI NULL
},
reportFreqConfiguration SEQUENCE {
cqi-FormatIndicator ENUMERATED { widebandCQI, subbandCQI } OPTIONAL, -- Need R
pmi-FormatIndicator ENUMERATED { widebandPMI, subbandPMI } OPTIONAL, -- Need R
csi-ReportingBand CHOICE {
subbands3 BIT STRING(SIZE(3)),
subbands4 BIT STRING(SIZE(4)),
subbands5 BIT STRING(SIZE(5)),
subbands6 BIT STRING(SIZE(6)),
subbands7 BIT STRING(SIZE(7)),
subbands8 BIT STRING(SIZE(8)),
subbands9 BIT STRING(SIZE(9)),
subbands10 BIT STRING(SIZE(10)),
subbands11 BIT STRING(SIZE(11)),
subbands12 BIT STRING(SIZE(12)),
subbands13 BIT STRING(SIZE(13)),
subbands14 BIT STRING(SIZE(14)),
subbands15 BIT STRING(SIZE(15)),
subbands16 BIT STRING(SIZE(16)),
subbands17 BIT STRING(SIZE(17)),
subbands18 BIT STRING(SIZE(18)),
...,
subbands19-v1530 BIT STRING(SIZE(19))
} OPTIONAL -- Need S

} OPTIONAL, -- Need R
timeRestrictionForChannelMeasurements ENUMERATED {configured, notConfigured},
timeRestrictionForInterferenceMeasurements ENUMERATED {configured, notConfigured},
codebookConfig CodebookConfig OPTIONAL, -- Need R
dummy ENUMERATED {n1, n2} OPTIONAL, -- Need R
groupBasedBeamReporting CHOICE {
enabled NULL,
disabled SEQUENCE {
nrofReportedRS ENUMERATED {n1, n2, n3, n4} OPTIONAL -- Need S
}
},
cqi-Table ENUMERATED {table1, table2, table3, spare1} OPTIONAL, -- Need R
subbandSize ENUMERATED {value1, value2},
non-PMI-PortIndication SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourcesPerConfig)) OF PortIndexFor8Ranks OPTIONAL, -- Need R
...,
[[
semiPersistentOnPUSCH-v1530 SEQUENCE {
reportSlotConfig-v1530 ENUMERATED {sl4, sl8, sl16}
} OPTIONAL -- Need R
]],
[[
semiPersistentOnPUSCH-v1610 SEQUENCE {
reportSlotOffsetListDCI-0-2-r16 SEQUENCE (SIZE (1.. maxNrofUL-Allocations-r16)) OF INTEGER(0..32) OPTIONAL, -- Need R
reportSlotOffsetListDCI-0-1-r16 SEQUENCE (SIZE (1.. maxNrofUL-Allocations-r16)) OF INTEGER(0..32) OPTIONAL -- Need R
} OPTIONAL, -- Need R
aperiodic-v1610 SEQUENCE {
reportSlotOffsetListDCI-0-2-r16 SEQUENCE (SIZE (1.. maxNrofUL-Allocations-r16)) OF INTEGER(0..32) OPTIONAL, -- Need R
reportSlotOffsetListDCI-0-1-r16 SEQUENCE (SIZE (1.. maxNrofUL-Allocations-r16)) OF INTEGER(0..32) OPTIONAL -- Need R
} OPTIONAL, -- Need R
reportQuantity-r16 CHOICE {
cri-SINR-r16 NULL,
ssb-Index-SINR-r16 NULL
} OPTIONAL, -- Need R
codebookConfig-r16 CodebookConfig-r16 OPTIONAL -- Need R
]]
}

- The UE measures CSI based on the configuration information related to the CSI.

The CSI measurement may include (1) a process of receiving a CSI-RS by the UE, and (2) a process of calculating CSI through the received CSI-RS, which will be described in detail later.

In the CSI-RS, the RE (resource element) mapping of the CSI-RS resource in the time and frequency domains is set by the higher layer parameter CSI-RS-ResourceMapping.

Table 8 shows an example of a CSI-RS-ResourceMapping IE for configuring CSI-RS resource mapping.

-- ASN1START
-- TAG-CSI-RS-RESOURCEMAPPING-START

CSI-RS-ResourceMapping ::= SEQUENCE {
frequencyDomainAllocation CHOICE {
row1 BIT STRING (SIZE (4)),
row2 BIT STRING (SIZE (12)),
row4 BIT STRING (SIZE (3)),
other BIT STRING (SIZE (6))
},
nrofPorts ENUMERATED {p1,p2,p4,p8,p12,p16,p24,p32},
firstOFDMSymbolInTimeDomain INTEGER (0..13),
firstOFDMSymbolInTimeDomain2 INTEGER (2..12) OPTIONAL, -- Need R
cdm-Type ENUMERATED {noCDM, fd-CDM2, cdm4-FD2-TD2, cdm8-FD2-TD4},
density CHOICE {
dot5 ENUMERATED {evenPRBs, oddPRBs},
one NULL,
three NULL,
spare NULL
},
freqBand CSI-FrequencyOccupation,
...
}

In Table 8, density (D: density) represents the density (density) of the CSI-RS resource measured in RE / port (port) / physical resource block (PRB: physical resource block), nrofPorts is the number of antenna ports - The UE reports the measured CSI to the base station.

- The UE reports the measured CSI to the base station.

Here, when the quantity of CSI-ReportConfig is set to 'none (or No report)', the terminal may omit the report. However, even when the quantity is set to 'none (or no report)', the terminal may report to the base station. When the quantity is set to 'none', it is when aperiodic TRS is triggered or when repetition is set. Here, only when repetition is set to 'ON', the report of the terminal may be omitted.

CSI measurement

The NR system supports more flexible and dynamic CSI measurement and reporting. Here, the CSI measurement may include a procedure of receiving a CSI-RS and acquiring CSI by computing the received CSI-RS.

As time domain behavior of CSI measurement and reporting, aperiodic/semi-persistent/periodic channel measurement (CM) and interference measurement (IM) are supported. A 4-port NZP CSI-RS RE pattern is used to configure the CSI-IM.

CSI-IM based IMR of NR has a design similar to CSI-IM of LTE, and is configured independently of ZP CSI-RS resources for PDSCH rate matching. And, in the NZP CSI-RS-based IMR, each port emulates an interference layer with a (preferred channel and) precoded NZP CSI-RS. This is for intra-cell interference measurement for a multi-user case, and mainly targets MU interference.

The base station transmits the precoded NZP CSI-RS to the terminal on each port of the configured NZP CSI-RS based IMR.

The terminal assumes a channel / interference layer for each port in the resource set and measures the interference.

For the channel, if there is no PMI and RI feedback, a plurality of resources are set in the set, and the base station or network indicates a subset of NZP CSI-RS resources through DCI for channel / interference measurement.

Let's look at resource setting and resource setting configuration in more detail.

resource setting

Each CSI resource setting 'CSI-ResourceConfig' includes a configuration for S≥1 CSI resource set (given by the higher layer parameter csi-RS-ResourceSetList). CSI resource setting corresponds to CSI-RS-resourcesetlist. Here, S represents the number of configured CSI-RS resource sets. Here, the configuration for S ≥ 1 CSI resource set is each CSI resource set including CSI-RS resources (consisting of NZP CSI-RS or CSI-IM) and SS / PBCH block (SSB) used for L1-RSRP computation ) including resources.

Each CSI resource setting is located in the DL BWP (bandwidth part) identified by the higher layer parameter bwp-id. And, all CSI resource settings linked to the CSI reporting setting have the same DL BWP.

The time domain behavior of the CSI-RS resource within the CSI resource setting included in the CSI-ResourceConfig IE is indicated by a higher layer parameter resourceType, and may be set to aperiodic, periodic or semi-persistent. For Periodic and semi-persistent CSI resource setting, the number of set CSI-RS resource sets (S) is limited to '1'. For Periodic and semi-persistent CSI resource settings, the set periodicity and slot offset are given in the numerology of the associated DL BWP, as given by bwp-id.

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

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

Next, one or more CSI resource settings for channel measurement (CM) and interference measurement (IM) are set through higher layer signaling.

- CSI-IM resource for interference measurement.

- NZP CSI-RS resource for interference measurement.

- NZP CSI-RS resource for channel measurement.

That is, a channel measurement resource (CMR) may be an NZP CSI-RS for CSI acquisition, and an interference measurement resource (IMR) may be a CSI-IM and an NZP CSI-RS for IM.

Here, CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.

And, the NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multi-users.

The UE may assume that CSI-RS resource(s) for channel measurement and CSI-IM / NZP CSI-RS resource(s) for interference measurement configured for one CSI reporting are 'QCL-TypeD' for each resource. .

resource setting configuration

As you can see, resource setting can mean a resource set list.

For aperiodic CSI, each trigger state set using the higher layer parameter CSI-AperiodicTriggerState is one or more CSI-ReportConfig and each CSI-ReportConfig linked to a periodic, semi-persistent or aperiodic resource setting. related

One reporting setting can be connected with up to three resource settings.

- When one resource setting is set, the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is for channel measurement for L1-RSRP computation.

- If two resource settings are set, the first resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is for channel measurement, and the second resource (given by csi-IM-ResourcesForInterference or nzp-CSI-RS -ResourcesForInterference) The setting is for interference measurement performed on CSI-IM or NZP CSI-RS.

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

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

- If one resource setting (given by resourcesForChannelMeasurement) is set, the resource setting is for channel measurement for L1-RSRP computation.

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

CSI calculation (computation)

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

And, when the interference measurement is performed in the NZP CSI-RS, the UE does not expect to be set to one or more NZP CSI-RS resources in the resource set associated with the resource setting for channel measurement.

The UE in which the higher layer parameter nzp-CSI-RS-ResourcesForInterference is configured does not expect that 18 or more NZP CSI-RS ports will be configured in the NZP CSI-RS resource set.

For CSI measurement, the UE assumes the following.

- Each NZP CSI-RS port configured for interference measurement corresponds to an interfering transport layer.

- All interfering transport layers of the NZP CSI-RS port for interference measurement consider the EPRE (energy per resource element) ratio.

- Another interference signal on the RE(s) of the NZP CSI-RS resource for channel measurement, NZP CSI-RS resource for measuring interference, or CSI-IM resource for measuring interference.

CSI reporting

For CSI reporting, time and frequency resources available to the UE are controlled by the base station.

CSI (channel state information) is a channel quality indicator (channel quality indicator, CQI), precoding matrix indicator (precoding matrix indicator, PMI), CSI-RS resource indicator (CRI), SS / PBCH block resource indicator (SSBRI), layer It may include at least one of indicator (LI), rank indicator (RI) or L1-RSRP.

For CQI, PMI, CRI, SSBRI, LI, RI, L1-RSRP, the terminal is a list of N≥1 CSI-ReportConfig reporting setting, M≥1 CSI-ResourceConfig resource setting and one or two trigger states (aperiodicTriggerStateList and semiPersistentOnPUSCH -provided by TriggerStateList), set by a higher layer. In the aperiodicTriggerStateList, each trigger state includes a channel and optionally an associated CSI-ReportConfigs list indicating resource set IDs for interference. In semiPersistentOnPUSCH-TriggerStateList, each trigger state includes one associated CSI-ReportConfig.

And, the time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic.

i) periodic CSI reporting is performed on short PUCCH and long PUCCH. Periodic CSI reporting period (periodicity) and slot offset (slot offset) may be set in RRC, refer to the CSI-ReportConfig IE.

ii) SP (semi-periodic) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH.

In the case of SP CSI on Short/long PUCCH, periodicity and slot offset are set to RRC, and CSI reporting is activated/deactivated by separate MAC CE/DCI.

In case of SP CSI on PUSCH, periodicity of SP CSI reporting is set to RRC, but slot offset is not set to RRC, and SP CSI reporting is activated/deactivated by DCI (format 0_1). For SP CSI reporting on PUSCH, a separate RNTI (SP-CSI C-RNTI) is used.

The initial CSI reporting timing follows the PUSCH time domain allocation value indicated by DCI, and the subsequent CSI reporting timing follows the cycle set by the RRC.

DCI format 0_1 includes a CSI request field, and can activate/deactivation a specific configured SP-CSI trigger state. SP CSI reporting has the same or similar activation/deactivation as the mechanism with data transmission on the SPS PUSCH.

iii) aperiodic CSI reporting is performed on PUSCH and is triggered by DCI. In this case, information related to the trigger of aperiodic CSI reporting may be delivered/indicated/configured through the MAC-CE.

In case of AP CSI having AP CSI-RS, AP CSI-RS timing is set by RRC, and timing for AP CSI reporting is dynamically controlled by DCI.

For NR, a method of dividing CSI in multiple reporting instances applied to PUCCH-based CSI reporting in LTE (eg, RI, WB PMI/CQI, SB PMI/CQI transmission in order) is not applied. Instead, NR limits the setting of a specific CSI report in short/long PUCCH, and a CSI omission rule is defined. And, in relation to AP CSI reporting timing, PUSCH symbol/slot location is dynamically indicated by DCI. And, candidate slot offsets are set by RRC. For CSI reporting, slot offset (Y) is set for each reporting setting. For UL-SCH, slot offset K2 is configured separately.

Two CSI latency classes (low latency class, high latency class) are defined in terms of CSI computation complexity. In the case of low latency CSI, it is WB CSI including a maximum of 4 ports Type-I codebook or a maximum of 4-ports non-PMI feedback CSI. High latency CSI refers to CSI other than low latency CSI. For a normal terminal, (Z, Z ') is defined in the unit of OFDM symbols. Here, Z represents the minimum CSI processing time from receiving an aperiodic CSI triggering DCI to performing CSI reporting. In addition, Z' represents the minimum CSI processing time from receiving CSI-RS for channel/interference to performing CSI reporting.

Additionally, the UE reports the number of CSIs that can be simultaneously calculated.

Hereinafter, a CSI reporting configuration will be described.

The UE calculates the CSI parameters (if reported) by assuming the dependency (dependency) between the following CSI parameters (if reported).

- LI is calculated based on the reported CQI, PMI, RI and CRI.

- CQI is calculated based on the reported PMI, RI and CRI.

- PMI is calculated based on the reported RI and CRI.

- RI is calculated based on the reported CRI.

quasi-co location (QCL)

An antenna port is defined such that a channel on which a symbol on an antenna port is carried can be inferred from a channel on which another symbol on the same antenna port is carried. When the property of a channel carrying a symbol on one antenna port can be inferred from a channel carrying a symbol on another antenna port, the two antenna ports are QC/QCL (quasi co-located or quasi co-location) ) can be said to be in a relationship.

Here, the channel characteristics include delay spread, Doppler spread, frequency/Doppler shift, average received power, and received timing/average delay. delay), including one or more of a spatial reception parameter (Spatial RX parameter). Here, the Spatial Rx parameter means a spatial (reception) channel characteristic parameter such as an angle of arrival.

In order for the terminal to decode the PDSCH according to the detected PDCCH having the DCI intended for the terminal and the given serving cell, up to M TCI-state configuration in the upper layer parameter PDSCH-Config A list of TCI-State configuration is can be set. The M depends on the UE capability.

Each TCI-State includes a parameter for establishing a quasi co-location relationship between one or two DL reference signals and a DM-RS (demodulation reference signal) port of the PDSCH.

The quasi co-location relationship is set with the upper layer parameter qcl-Type1 for the first DL RS and qcl-Type2 (if set) for the second DL RS. In the case of two DL RSs, the QCL type is not the same regardless of whether the reference is the same DL RS or different DL RSs.

The QCL type corresponding to each DL RS is given by the upper layer parameter qcl-Type of QCL-Info, and may take one of the following values:

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

- 'QCL-TypeB': {Doppler shift, Doppler spread}

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

- 'QCL-TypeD': {Spatial Rx parameter}

For example, if the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna port has a specific TRS from the QCL-Type A point of view, and a specific SSB and QCL from the QCL-Type D point of view. It can be indicated/set as The UE receiving this instruction/configuration receives the corresponding NZP CSI-RS using the Doppler and delay values measured in QCL-TypeA TRS, and applies the reception beam used for QCL-TypeD SSB reception to the corresponding NZP CSI-RS reception. can do.

The UE may receive an activation command by MAC CE signaling used to map up to 8 TCI states to a codepoint of the DCI field 'Transmission Configuration Indication'.

Multi-TRP (Multi-TRP) related behavior

In the technique of multi-point cooperative communication (CoMP: Coordinated Multi Point), a plurality of base stations exchange channel information (eg, RI/CQI/PMI/layer indicator (LI), etc.) fed back from the terminal with each other (eg, It refers to a method of effectively controlling interference by using the X2 interface) or using the cooperative transmission to the terminal. Depending on the method used, CoMP is joint transmission (JT), coordinated scheduling (CS), coordinated beamforming (CB), dynamic point selection (DPS), dynamic point blocking ( DPB: Dynamic Point Blocking).

The M-TRP transmission method in which M TRPs transmit data to one terminal is largely i) eMBB M-TRP transmission, which is a method to increase the transmission rate, and ii) URLLC M, which is a method for increasing the reception success rate and reducing latency -TRP transmission can be distinguished.

In addition, from the DCI transmission point of view, the M-TRP transmission method is i) M-DCI (multiple DCI) based M-TRP transmission in which each TRP transmits a different DCI, and ii) S-DCI in which one TRP transmits DCI It can be divided into (single DCI)-based M-TRP transmission. For example, in the case of S-DCI-based M-TRP transmission, since all scheduling information for data transmitted by the M TRP must be delivered to the UE through one DCI, dynamic cooperation between the two TRPs is ideal. It can be used in a backhaul (ideal BH: ideal BackHaul) environment.

The UE recognizes a PUSCH (or PUCCH) that transmits a PUSCH (or PUCCH) scheduled by DCI received with a different control resource set (CORESET) (or CORESET belonging to a different CORESET group) with different TRPs (or PUCCH). Or, it can be recognized as a PDSCH (or PDCCH) of a different TRP. In addition, the method for UL transmission (eg, PUSCH/PUCCH) transmitted with different TRPs, which will be described later, is for UL transmission (eg, PUSCH/PUCCH) transmitted to different panels belonging to the same TRP. The same can be applied to

Hereinafter, the CORESET group identifier (group ID) described / mentioned in the present disclosure may mean an index / identification information (eg, ID) for distinguishing CORESET for each TRP / panel. have. In addition, the CORESET group may be a group/union of CORESETs classified by an index/identification information (eg, ID)/the CORESET group ID for discriminating a CORESET for each TRP/panel. For example, the CORESET group ID may be specific index information defined in CORSET configuration. In this case, the CORESET group may be set/indicated/defined by an index defined in the CORESET configuration for each CORESET. And/or the CORESET group ID may mean an index/identification information/indicator for classification/identification between CORESETs set/related to each TRP/panel. Hereinafter, the CORESET group ID described/mentioned in the present disclosure may be expressed by being replaced with a specific index/specific identification information/specific indicator for classification/identification between CORESETs set/related to each TRP/panel. The CORESET group ID, that is, a specific index/specific identification information/specific indicator for classification/identification between CORESETs set/associated in each TRP/panel is higher layer signaling (eg, RRC signaling)/second It may be configured/indicated to the UE through layer signaling (L2 signaling, eg, MAC-CE)/first layer signaling (L1 signaling, eg, DCI). For example, it may be set/instructed so that PDCCH detection is performed for each TRP/panel (ie, for each TRP/panel belonging to the same CORESET group) in a corresponding CORESET group unit. And/or uplink control information (eg, CSI, HARQ-A/N (ACK/NACK), SR ( scheduling request) and/or uplink physical channel resources (eg, PUCCH/PRACH/SRS resources) may be set/instructed to be managed/controlled separately. And/or HARQ A/N (process/retransmission) for PDSCH/PUSCH scheduled for each TRP/panel for each CORESET group (ie, for each TRP/panel belonging to the same CORESET group) may be managed.

For example, an upper layer parameter, a ControlResourceSet information element (IE), is used to set a time/frequency control resource set (CORESET). For example, the control resource set (CORESET) may be related to the detection and reception of downlink control information. The ControlResourceSet IE is a CORESET-related ID (eg, controlResourceSetID) / index of the CORESET pool for CORESET (eg, CORESETPoolIndex) / time / frequency resource setting of CORESET / TCI information related to CORESET, etc. may include As an example, the index of the CORESET pool (eg, CORESETPoolIndex) may be set to 0 or 1. In the above description, a CORESET group may correspond to a CORESET pool, and a CORESET group ID may correspond to a CORESET pool index (eg, CORESETPoolIndex).

Hereinafter, a method for improving reliability in Multi-TRP will be described.

The following two methods can be considered as a transmission/reception method for improving reliability using transmission in multiple TRPs.

Referring to Figure 7 (a), it shows a case where the same codeword (CW: codeword) / transport block (TB: transport block) for transmitting the layer group (layer group) corresponding to different TRP. In this case, the layer group may mean a predetermined layer set consisting of one or more layers. In this case, the amount of transmission resources increases due to the number of layers, which has the advantage that robust channel coding with a low code rate can be used for TB. ) can be expected to improve the reliability of the received signal based on the gain.

Referring to FIG. 7(b), an example of transmitting different CWs through layer groups corresponding to different TRPs is shown. At this time, it can be assumed that the TBs corresponding to CW #1 and CW #2 in the figure are the same. That is, CW #1 and CW #2 mean that the same TB is converted into different CWs through channel coding or the like by different TRPs, respectively. Therefore, it can be seen as an example of repeated transmission of the same TB. In the case of FIG. 7(b), compared to FIG. 7(a), it may have a disadvantage that the code rate corresponding to the TB is high. However, depending on the channel environment, the code rate may be adjusted by indicating different redundancy version (RV) values for encoded bits generated from the same TB, or the modulation order of each CW may be adjusted. has the advantage of being

According to the method illustrated in FIGS. 7(a) and 7(b) above, the same TB is repeatedly transmitted through different layer groups, and as each layer group is transmitted by different TRP/panel, data reception of the terminal can increase the probability. This is referred to as a Spatial Division Multiplexing (SDM)-based M-TRP URLLC transmission scheme. Layers belonging to different layer groups are transmitted through DMRS ports belonging to different DMRS CDM groups, respectively.

In addition, the above-described multiple TRP-related contents have been described based on a spatial division multiplexing (SDM) scheme using different layers, but this is based on different frequency domain resources (eg, RB/PRB (set), etc.) based on FDM Of course, it can also be extended and applied to a time division multiplexing (TDM) method based on a frequency division multiplexing method and/or different time domain resources (eg, slots, symbols, sub-symbols, etc.).

Multi-TRP, scheduled by at least one DCI, may be performed as follows:

i) Scheme 1 (SDM): n (n is a natural number) TCI states in a single slot in overlapping time and frequency resource allocation

- Scheme 1a: Each transmission occasion is one layer or a set of layers of the same TB, and each layer or layer set is associated with one TCI and one set of DMRS port(s). A single codeword with one redundancy version (RV) is used for all layers or layer sets. From a UE perspective, different coded bits are mapped to different layers or layer sets with specific mapping rules.

- Technique 1b: Each transmission occasion is one layer or set of layers of the same TB, and each layer or layer set is associated with one TCI and one set of DMRS port(s). A single codeword with one RV is used for each spatial layer or set of layers. RVs corresponding to each spatial layer or layer set may be the same or different.

- Technique 1c: Each transmission occasion is one layer of the same TB having one DMRS port associated with multiple TCI status indices, or the same with multiple DMRS ports associated with multiple TCI indices in turn (one by one) It is one layer of TB.

In the aforementioned techniques 1a and 1c, the same MCS is applied to all layers or layer sets.

ii) Scheme 2 (FDM): n (n is a natural number) TCI states in a single slot in non-overlapping frequency resource allocation. Each non-overlapping frequency resource allocation is associated with one TCI state. The same single/multiple DMRS port(s) is associated with all non-overlapping frequency resource allocations.

- Scheme 2a: A single codeword with one RV is used over the entire resource allocation. From the UE point of view, a common RB mapping (layer mapping of codewords) is applied across all resource allocations.

- Scheme 2b: A single codeword with one RV is used for each non-overlapping frequency resource allocation. RVs corresponding to each non-overlapping frequency resource allocation may be the same or different.

In scheme 2a, the same MCS is applied to all non-overlapping frequency resource allocations.

iii) Technique 3 (TDM): n (n is a natural number) TCI states in a single slot in non-overlapping time resource allocation. Each transmission occasion of TB has one TCI and one RV with time granularity of a mini-slot. All transmission occasion(s) in the slot use a common MCS with the same single or multiple DMRS port(s). RV/TCI status may be the same or different among transmission occasions.

iv) Technique 4 (TDM): n (n is a natural number) TCI states in K (n<=K, K is a natural number) different slots. Each transmission occasion of TB has one TCI and one RV. All transmission occasion(s) across K slots use a common MCS with the same single or multiple DMRS port(s). RV/TCI status may be the same or different among transmission occasions.

How to send/receive channel status information

In the current standard, channel state information (CSI: channel state information) reported by the UE is defined to correspond to a single NZP CSI-RS resource for channel measurement (CM). Therefore, there is a disadvantage in that it is not possible to calculate joint CSI considering the multi-TRP (M-TRP) transmission situation (ie, CSI considering the mutual interference between TRPs).

As in the example of Figure 8, NZP CSI-RS resource for each CM in different TRP is set, and the terminal is based on each NZP CSI-RS resource CSI (e.g., CRI / RI / PMI / CQI / LI After calculating, etc.), the CSI corresponding to each TRP may be reported to the base station (eg, either TRP or all TRPs, respectively). In addition, the base station may perform M-TRP transmission based on the CSI reported by the terminal. However, as in the example of FIG. 8 , mutual interference between different TRPs is not reflected in the CSI reported by the UE to the base station. That is, the CSI calculation / reporting operation for each TRP is independently performed based on a separate NZP CSI-RS resource set for each TRP. Therefore, the CSI reported by the UE and the actual CSI value expected from the UE for the eNB to perform M-TRP transmission may be different.

Equations

3 and 4 below show an example of calculating a signal to interference plus noise ratio (SINR) value that can be utilized for CQI calculation by the UE using the NZP CSI-RS resource corresponding to each TRP. show

Equation 3 illustrates the calculation of the SINR value for TRP#1, and Equation 4 illustrates the calculation of the SINR value for TRP#2

In

Equations

3 and 4, SINR ₁ and SINR ₂ illustrate an SINR calculation method for optimal CQI estimation based on the NZP CSI-RS resource for CM of TRP#1 and TRP#2, respectively.

In

Equations

3 and 4, the h _eff,1,i and h _eff,2,i are specific free in the downlink channel estimated based on the NZP CSI-RS resource for CM transmitted from TRP#1 and TRP#2, respectively. Effective channel vector corresponding to the i-th layer of the effective channel matrix H _eff,1 = H ₁ W ₁ , H _eff,2 = H ₂ W ₂ to which the coding matrix (eg, W ₁ , W ₂ ) is applied can mean σ _N may mean noise variance of the terminal.

When the UE reports the CQI to the base station, a specific CQI value may be selected based on the SINR estimated using the CSI-RS. However, as can be seen in the examples of

Equations

3 and 4, interference between different TRPs cannot be reflected when calculating the SINR based on the NZP CSI-RS resource corresponding to each TRP. Therefore, the base station cannot accurately know the actual SINR (ie, CQI) of the terminal when transmitting the M-TRP. In this case, when the base station sets/indicates a modulation and coding scheme (MCS) higher than the actual CQI of the terminal, retransmission is required, which may cause a delay, and also lower the throughput. can do it Alternatively, if the MCS is set/indicated lower than the actual CQI, the throughput may be reduced. Therefore, there is a need for a method capable of reporting an accurate CQI value reflecting interference between different TRPs to the base station. Equation 5 below shows an example of calculating the SINR reflecting interference between different TRPs.

The present disclosure proposes a method for reporting accurate CSI (eg, CQI value) reflecting interference between different TRPs to the base station in consideration of M-TRP transmission.

In the present disclosure, for convenience of description, it is assumed that two TRPs (eg, TRP1/TRP2) operate. However, this assumption does not limit the technical scope of the present invention.

It is apparent that the description of TRP in the present disclosure may be for convenience of description, and TRP may also be interpreted in terms such as panel/beam.

In the present disclosure, the first layer (L1: layer 1) signaling may mean DCI-based dynamic signaling between the base station and the terminal, and the second layer (L2: layer 2) signaling is RRC/MAC control between the base station and the terminal It may mean higher layer signaling based on element (CE: control element).

Hereinafter, in the description of the present disclosure, transmitting/receiving a (NZP) CSI-RS resource may be interpreted as meaning transmitting/receiving a CSI-RS on a corresponding (NZP) CSI-RS resource.

Hereinafter, a method of reporting CSI in consideration of multi-TRP transmission according to an embodiment of the present disclosure will be described.

Embodiment #1: The base station may configure different NZP CSI-RS resources in a single reporting setting to the terminal. In addition, the base station determines the number of ranks for each NZP CSI-RS resource when the UE calculates CSI (eg, RI/PMI/CQI, etc.) (ie, a transmission layer and/or a port). number) and/or the assumption for the precoding matrix may be set/instructed/defined to the terminal to be applied differently.

For example, the CQI value reported by the UE is determined according to the reported PMI, RI, and CRI (conditioned). The reported CQI value is calculated by assuming that the base station applies the precoding, rank and CSI-RS selection requested by the terminal. Accordingly, even in the same radio channel situation, options of precoding assumed by the terminal (eg, the number of ranks (ie, the number of transmission layers and/or ports) and/or precoding As the matrix (precoding matrix) changes, the UE may report different CQI values.

According to the current standard, PMI reporting is based on six codebook categories. The six codebook categories include Type I single-panel codebooks with a maximum rank of 8, Type I multi-panel codebooks with a maximum rank of 4, and Type II optimized for multi-user MIMO but limited to a maximum rank of 2. codebooks and Type II port selection codebooks, and Enhanced Type II codebooks and Enhanced Type II port selection codebooks optimized for multi-user MIMO but limited to a maximum rank of 4 are included. In the case of the type I codebook, the base station provides relatively coarse information to the terminal, and in the case of the type II codebook, the base station provides relatively detailed information.

Information/parameters related to the PMI report may be provided through the codebook configuration (CodebookConfig) in the CSI report (CSI-ReportConfig). In the codebook configuration (CodebookConfig), a codebook type for a related PMI report is identified using a combination of a codebookType and a subtype.

For example, specifically, the codebook configuration (CodebookConfig) may include the following information/parameters. Codebook configuration (CodebookConfig) is a codebook type (codebook type I (type1) and codebook type II (type2)) and subtype (in the case of type I, type I - single panel (typeI-SinglePanel) and type I - multiple panel ( typeI-MultiPanel) / In the case of type II, parameters corresponding to type II (typeII) and type II port selection (typeII-PortSelection) may be included.

Type I single panel codebook supports up to rank 8. Also, in the case of a Type I single panel codebook, two antenna ports or two or more antenna ports may be used. If only two antenna ports are used, the codebook provides precoding for MIMO. If two or more antenna ports are used, the codebook provides precoding for both MIMO and beamforming. When two or more antenna ports are used, the base station through the 'n1-n2' parameter, the number of antenna ports in the first dimension (n1), the number of antenna ports in the second dimension (n2) ) and codebook subset restrictions can be set. In addition, the base station may set the restriction on the RI through the 'typeI-SinglePanel-ri-Restriction' parameter.

Type I multi-panel codebook supports 2 or 4 antenna panels, and supports up to rank 4. The base station through the 'ng-n1-n2' parameter, the number of antenna panels (ng), the number of antenna ports in the first dimension (n1), the number of antenna ports in the second dimension (second deminsion) ( n2) and codebook subset restriction can be set. The base station may set restrictions on RI through the 'ri-Restriction' parameter.

Type II codebook supports a maximum of rank 2. The base station through the 'n1-n2-codebookSubsetRestriction' parameter, the number of antenna ports in the first dimension (n1), the number of antenna ports in the second dimension (second deminsion) (n2) and codebook subset restriction (codebook subset) restriction) can be set. In addition, the base station may set the restriction on the RI through the 'typeII-RI-Restriction' parameter.

The Type II port selection codebook supports a maximum of rank 2. The number of antenna ports used for CSI-RS transmission is set using parameters/information (nrofPorts) for the number of antenna ports in the configuration for CSI-RS resource mapping (CSI-RS-ResourceMapping). The base station may set the size of the port selection codebook through the 'portSelectionSamplingSize' parameter. That is, the 'portSelectionSamplingSize' parameter specifies an interval (eg, 1, 2, 3, 4) between candidate beam selections. In addition, the base station may set the restriction on the RI through the 'typeII-PortSelectionRI-Restriction' parameter.

Enhanced Type II codebook supports up to rank 4. The base station through the 'n1-n2-codebookSubsetRestriction-r16' parameter, the number of antenna ports in the first dimension (n1), the number of antenna ports in the second dimension (second deminsion) (n2) and the codebook subset restriction ( codebook subset restriction) can be set. In addition, the base station may set the restriction on RI through the 'typeII-RI-Restriction-r16' parameter.

The enhanced Type II port selection codebook supports up to rank 4. The number of antenna ports used for CSI-RS transmission is set using parameters/information (nrofPorts) for the number of antenna ports in the configuration for CSI-RS resource mapping (CSI-RS-ResourceMapping). The base station may set the size of the port selection codebook through the 'portSelectionSamplingSize-r16' parameter. That is, the 'portSelectionSamplingSize-r16' parameter specifies an interval (eg, 1, 2, 3, 4) between candidate beam selections. In addition, the base station may set the restriction on the RI through the 'typeII-PortSelectionRI-Restriction-r16' parameter.

As described above, the terminal identifies the codebook type for PMI report through the codebook configuration (CodebookConfig), and provides (derived) PMI and/or RI calculated based on the codebook type set for the CSI-RS resource to the base station. can report And, the UE may calculate the CQI based on/under the PMI and/or RI reported to the base station.

That is, for example, for each NZP CSI-RS resource in the above-described embodiment, the number of ranks (ie, the number of transport layers and/or ports) and/or the precoding matrix (precoding). matrix) differently, it can be interpreted that different codebook settings (that is, codebookConfig parameters) in the CSI reporting settings for each NZP CSI-RS resource can be set.

- Although RI/PMI/CQI has been described as an example of CSI in the above embodiment, LI/CRI/reference signal received power (RSRP)/SINR may also be considered.

- In the above embodiment, the base station is based on the L1/L2 signaling in the setting (ie, different NZP CSI-RS resource settings in a single report setting and CSI calculation for different NZP CSI-RS resources in a rank assumed when calculating ( rank) number and/or precoding matrix) may be set/indicated to the UE. And/or the configuration may be defined as a fixed rule between the base station and the terminal (that is, in this case, there may be no separate signaling by the base station).

- In the proposed method, 'reporting setting' refers to 'CSI-ReportConfig', which is a higher layer parameter (ie, information element (IE)) for setting the characteristics of CSI reporting. have. As shown in Table 7 above, CSI-ReportConfig may include a channel measurement resource (CMR) (ie, resourcesForChannelMeasurement parameter). The resourcesForChannelMeasurement parameter indicates a resource for channel measurement, and indicates a CSI resource configuration identifier (ID: identity) (csi-ResourceConfigId) of a CSI resource configuration (CSI-ResourceConfig). In addition, CSI-ReportConfig may include an interference measurement resource (IMR) (ie, csi-IM-ResourcesForInterference parameter). The csi-IM-ResourcesForInterference parameter indicates a CSI IM resource for interference measurement, and indicates a CSI resource configuration identifier (ID: identity) (csi-ResourceConfigId) of a CSI resource configuration (CSI-ResourceConfig). CSI-ReportConfig may include a report amount (ie, reportQuantity parameter). The reportQuantity parameter indicates CSI-related quantities to be reported. Also, the CSI-ReportConfig may include a codebook configuration (ie, a codebookConfig parameter). Codebook setting indicates codebook setting of codebook type-1 or codebook type-2 including subset restrictions, codebook type (eg, Type I) / enhanced type (Type) II codebook, etc.). In addition, as in the example of Table 7 above, information not mentioned above may also be included in the CSI-ReportConfig.

- In the above embodiment, the UE may assume that all 'different NZP CSI-RS resources' correspond to (desired) intended transmission layer(s) (intended transmission layer(s)). In the current standard, when calculating CSI (desired), it is assumed that the intended transmission layer(s) (intended transmission layer(s)) is included in a single NZP CSI-RS resource. According to the current standard, the terminal is a codebook type (eg, type II ('typeII'), type II port selection ('typeII-PortSelection'), release-16 type II ('typeII-r16') or release-16 It is not expected that one or more CSI-RS resources are configured in a resource set for channel measurement for a CSI report configuration (CSI-ReportConfig) having a type II port selection ('typeII-PortSelection-r16').

For example, the CQI value represents a value for a ratio to signal to interference plus noise. This may mean that the UE needs to complete both signal power measurement and interference plus noise power measurement desired by the UE. Here, the desired signal measurement may be measured using the NZP CSI-RS. The related NZP CSI-RS is identified by the resource (resourcesForChannelMeasurement) for measuring the channel in the CSI report configuration (CSI-ReportConfig). Interference and noise (interference plus noise) measurement may be measured using an interference measurement (IM) resource and/or NZP CSI-RS for interference measurement. These resources can be identified by the CSI-IM resource (csi-IM-ResourcesForInterference) and the NZP CSI-RS resource for interference (nzp-CSI-RS-ResourcesForInterference) in the CSI report configuration (CSI-ReportConfig). have.

On the other hand, according to this embodiment, it can be seen as a difference from the current standard that a plurality of resources are considered. That is, for example, the UE assumes that 'different NZP CSI-RS resources' correspond to all (desired) intended transmission layer(s) (intended transmission layer(s)), CSI report configuration It may mean that CSI resources (resourcesForChannelMeasurement) for measuring multiple channels having different codebook settings (ie, codebookConfig parameters) may be configured.

Example #1-1: For a specific NZP CSI-RS resource (hereinafter, referred to as a first CSI resource) as 'assume for the precoding matrix' in the above embodiment (a specific scaling value is applied) unit matrix It can be set/directed/defined to assume (Identity matrix). That is, when the UE calculates CSI for a specific NZP CSI-RS resource, it may be configured/instructed/defined to perform CSI calculation assuming the identity matrix as a precoding matrix.

For resources other than the specific NZP CSI-RS resource (the first CSI resource) (hereinafter, the second CSI resource), a specific codebook (eg, Type I/ (enhanced) Type II codebook, etc.) /can be defined Here, in the case of the second CSI resource, it may be configured/indicated/defined so that the UE reports a specific RI/PMI for the specific codebook. When the proposed method is assumed, since an identity matrix can be assumed for the specific resource (ie, the first CSI resource), the terminal is free for the specific resource (ie, the first CSI resource) A separate report on the coding matrix may not be performed to the base station. That is, the UE may not report the PMI (and/or RI) to the base station for the first CSI resource. In addition, the terminal may report the RI/PMI to the base station only for a resource (ie, the second CSI resource) that does not correspond to the identity matrix. Accordingly, there is an effect of reducing signaling overhead for CSI reporting.

The reason why the UE can assume the identity matrix for a specific resource (ie, the first CSI resource) is that the base station has already selected an appropriate precoding matrix for a specific TRP (via UL signal and/or separate CSI feedback) etc.), the selected precoding matrix can be considered because it has already been reflected in the NZP CSI-RS port (s) of the resource (ie, the first CSI resource). A more detailed description will be given later.

Embodiment #1-2: In the above proposed method, it may be configured/indicated/defined to assume the number of antenna ports configured in a specific NZP CSI-RS resource as the number of ranks as 'assume for the number of ranks'. In addition, the number of ranks may be set/indicated/defined to be applied as a fixed value when the UE calculates CSI. And/or it may be configured/indicated/defined so that the UE calculates CSI while changing the number of ranks, and reports the number of (optimal) ranks preferred by the UE to the base station. When the UE can report the optimal rank number to the base station, it may have the advantage of being able to report the optimal rank number by reflecting inter-TRP interference during multi-TRP transmission. Or, when the UE reports/reports the optimal rank number to the base station, the UE is configured to report information on the preferred (optimal) antenna port (s) (and/or layer (number)) to the base station /directed/can be defined. And, the specific NZP CSI-RS resource to which the proposed method is applied may correspond to a resource assuming that the precoding matrix is an identity matrix. A more detailed description will be given later.

Embodiment #1-3: In the above embodiment, an example of a value reported by the terminal to the base station may be as follows.

For example, one or more CRI values, and / or a specific codebook type (codebook type) is set / indicated / PMI for the defined NZP CSI-RS resource (here, PMI may correspond to one of the CRI values above) , and / or RI (the specific codebook type (codebook type) may correspond to a set / indicated / defined resource. Or, the total RI value for resources selected as CRI), and / or CQI, etc. The UE may report CSI to the base station.

In addition, for the NZP CSI-RS resource assuming an identity matrix as an additional precoding matrix, port selection (port selection) information may be reported. For example, one or more CRI values, and / or a specific codebook type (codebook type) is set / indicated / PMI for the defined NZP CSI-RS resource (here, PMI may correspond to one of the CRI values above) , and / or RI (the specific codebook type (codebook type) may correspond to a set / indicated / defined resource. Or, the total RI value for resources selected as CRI), and / or CQI, and / or A specific codebook type (codebook type) is not set / indicated / defined NZP CSI-RS resource (e.g., a resource that assumes an identity matrix as a precoding matrix) port index (s), etc. The UE may report CSI to the base station.

Embodiment #1-4: In the above embodiment, 'different NZP CSI-RS resources' in a single reporting setting / CSI reporting setting (eg, CSI-ReportConfig) An example of a method that can be set As follows.

Example 1: How to set with different resource settings

Here, the resource setting ('resource setting') may mean CSI-ResourceConfig which is a higher layer parameter/IE for setting CSI resource characteristics.

Here, all different resources may be set for channel measurement (CM: channel measurement) purpose. Alternatively, some of the different resources are set for channel measurement and the rest may be set for interference measurement (IM).

For example, when two resources are configured (ie, when two resource settings are configured), each resource may be set as a resource setting for channel measurement and a resource setting for interference measurement.

Or, when two resources are set (ie, when two resource settings are set), each resource may be set as a resource setting for CM.

Here, each resource may be set based on a single/plural resource setting.

For example, setting a different NZP CSI-RS resource in a single reporting setting / CSI reporting setting (eg, CSI-ReportConfig) means that the resource for channel measurement (eg, resourcesForChannelMeasurement) is It may mean that a plurality of settings are made. That is, it may mean that a plurality of CSI resource configurations (e.g. CSI-ResourceConfig) are included in the reporting setting.

For example, NZP CSI-RS resource for CSI measurement for different TRPs based on an index / identifier (ID: identity) (eg, CSI-ResourceConfigID) associated with each CSI resource configuration can be determined. For example, the index / ID associated with different CSI resource settings (eg, CSI-ResourceConfigID) and the index associated with multiple TRPs (eg, TRP ID / CORESET pool index (CORESETPoolIndex)) are in ascending / descending order can be matched. For example, CSI-ResourceConfigID=1 may correspond to TRP ID=1/CORESETPoolIndex=0, and CSI-ResourceConfigID=2 may correspond to TRP ID=2/CORESETPoolIndex=1. And/or, index/ID (eg, CSI-ResourceConfigID) associated with different CSI resource configurations may correspond to different TRPs based on a fixed rule between the base station and the terminal. For example, the index associated with the CSI resource setting may correspond in ascending/descending order based on the order in which the index is set in the reporting setting. For example, the first index and the second index associated with the CSI resource configuration may correspond to the first TRP and the second TRP, respectively. And/or, the base station may transmit a separate setting/instruction for informing the terminal of the correspondence relationship to the terminal. The UE may calculate CSI based on the CSI resource configuration corresponding to each TRP.

Example 2: Setting a different NZP CSI-RS resource in a single reporting setting / CSI reporting setting (eg, CSI-ReportConfig) is a single resource setting (resource setting) / CSI resource setting (eg For example, it may mean that NZP CSI-RS resources belonging to different resource sets are configured in CSI-ResourceConfig). That is, in a single reporting setting / CSI reporting setting, a single resource setting / CSI resource setting is configured / associated, and NZP CSI- associated with different NZP-CSI-RS resource sets within the single resource setting / CSI resource setting. RS resource may be configured.

For example, resource setting / CSI resource configuration (eg, CSI-ResourceConfig) is one or more NZP CSI-RS resource set (NZP-CSI-RS-Resourceset) / CSI-IM resource set (CSI-IM-Resourceset) / Includes the setting for the group of CSI-SSB resource set (CSI-SSB-Resourceset). Here, by setting each NZP-CSI-RS-Resources in different NZP CSI-RS resource sets (NZP-CSI-RS-Resourceset), different NZP-CSI-RS-Resources are single reporting setting (reporting setting) It may be configured in /CSI reporting configuration (eg, CSI-ReportConfig).

For example, a plurality of NZP-CSI-RS resource sets in the resource setting / CSI reporting configuration (eg, CSI-ResourceConfig) may be configured, and CSI for different TRPs based on the ID associated with each resource set NZP CSI-RS resource (/resource set) for measurement may be determined. For example, an ID associated with a resource set (eg, NZP-CSI-RS-ResourceSetID) and an index associated with multiple TRPs (eg, TRP ID/ CORESET pool index (CORESETPoolIndex)) correspond in ascending/descending order can be As an example, NZP-CSI-RS-ResourceSetID=1 may correspond to TRP ID=1/CORESETPoolIndex=0, and NZP-CSI-RS-ResourceSetID=2 may correspond to TRP ID=2/CORESETPoolIndex=1. And/or, ID associated with the resource set (eg, NZP-CSI-RS-ResourceSetID) may correspond to different TRPs based on a fixed rule between the base station and the terminal. For example, IDs associated with a resource set may respond in ascending/descending order based on the order in which they are set in the resource setting. For example, the first ID and the second ID associated with the resource set may correspond to the first TRP and the second TRP, respectively. And/or, the base station may transmit a separate setting/instruction for informing the terminal of the correspondence relationship to the terminal. The UE may calculate CSI based on the resource set corresponding to each TRP.

Example 3: Setting a different NZP CSI-RS resource in a single reporting setting / CSI reporting setting (eg, CSI-ReportConfig) is a single resource setting (resource setting) / CSI resource setting (eg For example, it may mean that different NZP CSI-RS resources are set within a single resource set in CSI-ResourceConfig). For example, a single resource set (eg, NZP-CSI-RS-ResourceSet) in resource setting / CSI resource configuration (eg, CSI-ResourceConfig) is one or more NZP-CSI-RS-Resources and related parameters includes Here, different NZP-CSI-RS-Resources within a single resource set (eg, NZP-CSI-RS-ResourceSet) in a single reporting setting / CSI reporting setting (eg, CSI-ReportConfig) can be set.

For example, based on the ID associated with each NZP-CSI-RS-Resource (eg, NZP-CSI-RS-ResourceID), NZP CSI-RS resource for CSI measurement for different TRPs may be determined. For example, the ID associated with the resource (eg, NZP-CSI-RS-ResourceID) and the index associated with a number of TRPs (eg, TRP ID / CORESET pool index (CORESETPoolIndex)) will be mapped in ascending / descending order can As an example, NZP-CSI-RS-ResourceID=1 may correspond to TRP ID=1/CORESETPoolIndex=0, and NZP-CSI-RS-ResourceID=2 may correspond to TRP ID=2/CORESETPoolIndex=1. And/or, the ID associated with the NZP-CSI-RS-Resource (eg, NZP-CSI-RS-ResourceID) may correspond to different TRPs based on a fixed rule between the base station and the terminal. For example, the ID associated with the NZP-CSI-RS-Resource may respond in ascending/descending order based on the order in which the resource set is set. For example, the first ID and the second ID associated with the NZP-CSI-RS-Resource may correspond to the first TRP and the second TRP, respectively. And/or, the base station may transmit a separate setting/instruction for informing the terminal of the correspondence relationship to the terminal. The UE may calculate CSI based on the NZP-CSI-RS-Resource corresponding to each TRP.

Referring to FIG. 9( a ), the base station (eg, TRP#1) may transmit the NZP CSI-RS resource for TRP#1 to the terminal in TRP#1. In addition, the UE may report CSI (eg, RI/PMI/CQI, etc.) for TRP#1 to the base station (eg, TRP#1) based on the NZP CSI-RS resource.

Referring to FIG. 9(b), the base station (eg, TRP#2) may transmit an NZP CSI-RS resource to the terminal in TRP#2 to obtain CSI for TRP#2. Here, the base station may additionally (or together) transmit an NZP CSI-RS resource to which RI/PMI is applied to the terminal in TRP#1 based on the CSI report value for the TRP#1. Therefore, when the terminal receives the NZP CSI-RS resource for TRP#2, the NZP CSI-RS resource for TRP#1 may also be received. Here, since the RI/PMI value to be applied at the time of M-TRP transmission is applied to the NZP CSI-RS resource corresponding to TRP#1, the UE reflects the influence of the interference between TRPs that will occur during M-TRP transmission. For example, RI/PMI/CQI) may be calculated.

Equation 6 below shows an example of calculating SINR based on the NZP CSI-RS resource of TRP#1 in FIG. 9(a). In addition, Equation 7 shows an example of calculating the SINR based on the NZP CSI-RS resource of TRP#1/#2 in FIG. 9(b).

Referring to Equation 6, when the UE calculates SINR ₁ , the UE is based on the NZP CSI-RS port(s) of the NZP CSI-RS resource for TRP#1 (ie, NZP CSI-RS port(s)) Estimate the DL channel (eg, H ₁ ) and find the RI/PMI combination with the best SINR based on the configured codebook (eg, based on the CSI-RS transmitted on W ₁ ). And, based on the SINR value of the effective channel (eg, H _eff,1 = H ₁ W ₁ ) at this time, the UE may report the corresponding CQI value to the base station (together).

Referring to Equation 7, when the UE calculates SINR ₂ , for the NZP CSI-RS port(s) of the NZP CSI-RS resource for TRP#1, the effective channel to which the precoding matrix is applied at the base station (for example, , H _eff,1 = H ₁ W ₁ ), the precoding matrix from the viewpoint of the terminal may assume an identity matrix (eg, H _eff,1 I = H _eff,1 ). And, the terminal based on the NZP CSI-RS port(s) of the NZP CSI-RS resource for TRP #2 (that is, based on the CSI-RS transmitted on the NZP CSI-RS port(s)) DL channel Estimate (eg, H ₂ ) and find the RI/PMI combination having the best SINR based on the set codebook (eg, W ₂ ). And for this, the UE may consider the signal from TRP#1 together as in the equation for SINR ₂ in Equation 7 above. The UE may report the RI/PMI combination (eg, information on W ₂ ) and CQI having the best SINR value to the base station.

Meanwhile, the method of SINR ₂ in Equation 7 may be an example, and the UE may calculate the CQI based on the average value, the maximum value, or the minimum value after calculating the SINR for each layer.

On the other hand, in the above example, when calculating SINR ₂ , it was assumed that all of the NZP CSI-RS port(s) of the NZP CSI-RS resource for TRP#1 were as it is, and a variable number of ports, and/or a variable port combination can be considered together. In the above, 'variable number of ports and/or variable port combination' refers to NZP CSI-RS port(s) corresponding to TRP#1, that is, NZP assuming that the identity matrix is the precoding matrix. For port(s) of the CSI-RS resource, it may be defined based on a specific column of an effective channel corresponding thereto.

In addition, in the example of FIG. 9(b) (and Equation 7), the RI/PMI corresponding to TRP#1 obtained by the base station through the preceding process as shown in FIG. 9(a) is transmitted even when M-TRP is transmitted. Although it is assumed that it is applied as it is, it may be possible to apply a more suitable RI/PMI to TRP#1 during M-TRP transmission based on the CSI report value for TRP#2.

When the above proposed method is applied, it is possible to obtain an advantage that more suitable CSI can be obtained during M-TRP transmission from the viewpoint of the base station. That is, when the UE reports CSI, it is possible to obtain the advantage of being able to report CSI by reflecting different TRP transmission states (eg, RI/PMI/CQI, etc.) during M-TRP transmission. Compared with the method following the current standard, when CSI#1 and CSI#2 for TRP#1 and TRP#2 are reported, each CSI can only consider an effective channel for each TRP. On the other hand, when using the proposed method, the UE may apply the information of CSI#1 when reporting CSI#2 for TRP#2 after reporting CSI#1 for TRP#1. Accordingly, the UE may use all of the effective channels for TRP#1 and TRP#2 when reporting CSI#2. Or, conversely, the UE may apply the information of CSI#2 when reporting CSI#1 for TRP#1 after reporting CSI#2 for TRP#2. As such, when the terminal can report CSI by considering all effective channels corresponding to different TRPs when transmitting M-TRP to the base station, the base station is more suitable for the channel of the terminal when scheduling the PDSCH based on MTRP transmission to the terminal Scheduling can be performed. Accordingly, unnecessary retransmission due to reception failure of the terminal can be prevented, and throughput can be improved by setting an MCS suitable for the terminal channel.

On the other hand, in the above proposal, after setting/indicating/defining a specific codebook type for the NZP CSI-RS resource corresponding to TRP#2, it was assumed that an RI/PMI suitable for CSI calculation was reported, but TRP It is also possible to apply the same assumption/method applied to TRP#1 to the resource corresponding to #2. For example, the UE assumes an identity matrix as a precoding matrix even for a resource corresponding to TRP #2, and assumes the number of port(s) corresponding to the resource as the number of ranks. can be applied In this case, an example of the value reported by the terminal to the base station may be as follows.

Example 1: One or more CRI values, and / or one or more RI values (RI values corresponding to each NZP CSI-RS resource, or total RI values corresponding to all resources), and / or CSI including CQI terminal It can report to this base station.

In addition, when port selection information is reported for NZP CSI-RS resource assuming an identity matrix as a precoding matrix, for example, one or more CRI values, and/or one or more RI values ( RI value corresponding to each NZP CSI-RS resource, or total RI value corresponding to all resources), and / or a specific port index (port index) combination corresponding to each NZP CSI-RS resource, and / or CQI, etc. The terminal may report the CSI included to the base station.

10 shows multiple methods to which the methods proposed in the present disclosure (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) can be applied. (Multiple) TRP (ie, M-TRP, or multiple (multiple) cell, hereinafter all TRP can be replaced by a cell) in the situation of a network (Network) (eg, TRP 1, TRP 2) and the terminal (ie , illustrates signaling between UEs.

Here, the UE/Network is just an example, and may be substituted for various devices as described in FIG. 13 to be described later. 10 is only for convenience of description, and does not limit the scope of the present disclosure. Also, some step(s) shown in FIG. 10 may be omitted depending on circumstances and/or settings.

Referring to FIG. 10 , signaling between two TRPs and a UE is considered for convenience of description, but it goes without saying that the corresponding signaling method can be extended and applied to signaling between multiple TRPs and multiple UEs. In the following description, a Network may be a single base station including a plurality of TRPs, and may be a single cell including a plurality of TRPs. For example, an ideal (ideal) / non-ideal (non-ideal) backhaul (backhaul) may be set between TRP 1 and TRP 2 constituting the network. In addition, the following description will be described based on a plurality of TRPs, which may be equally extended and applied to transmission through a plurality of panels. In addition, in the present disclosure, the operation of the terminal receiving a signal from TRP1/TRP2 can be interpreted/explained as an operation of the terminal receiving a signal from the Network (via/using TRP1/2) (or it may be an operation) , the operation in which the terminal transmits a signal to TRP1/TRP2 can be interpreted/explained as an operation in which the terminal transmits a signal to the network (via/using TRP1/TRP2) (or may be an operation), and vice versa /can be explained.

In addition, as described above, "TRP" is a panel, an antenna array, a cell (eg, macro cell (macro cell) / small cell (small cell) / pico cell (pico)) cell), etc.), TP (transmission point), base station (base station, gNB, etc.) may be replaced and applied. As described above, the TRP may be classified according to information (eg, index, identifier (ID)) about the CORESET group (or CORESET pool). As an example, when one terminal is configured to perform transmission/reception with a plurality of TRPs (or cells), this may mean that a plurality of CORESET groups (or CORESET pools) are configured for one terminal. The configuration of such a CORESET group (or CORESET pool) may be performed through higher layer signaling (eg, RRC signaling, etc.). In addition, the base station may mean a generic term for an object that transmits and receives data with the terminal. For example, the base station may be a concept including one or more TPs (Transmission Points), one or more TRPs (Transmission and Reception Points), and the like. In addition, the TP and/or TRP may include a panel of a base station, a transmission and reception unit, and the like.

In addition, as described above, the TRP may be classified according to information (eg, index, ID) about the CORESET pool (or CORESET group). As an example, TRP may be classified according to CORESETPoolIndex. As an example, when one terminal is configured to perform transmission/reception with a plurality of TRPs (or cells), this may mean that a plurality of CORESET pools (or CORESET groups) are configured for one terminal. The setting for CORESET may be performed through higher layer signaling (eg, RRC signaling, etc.).

Specifically, Figure 10 shows M-TRP (or cell, hereinafter all TRPs can be replaced by cell/panel, or when a plurality of CORESETs (/CORESET group) are set from one TRP. In the case where the UE receives a single DCI (that is, when the representative TRP transmits DCI to the UE), signaling is indicated. In FIG. 10 , a single DCI-based M-TRP operation is assumed for convenience of description, but the technical scope of the present invention is not limited. Therefore, it is of course also applicable to a single DCI-based M-TRP operation (ie, when each TRP transmits DCI to the UE).

Although not shown in FIG. 10, the UE uses the method proposed in the above-described method (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1). UE capability including capability information related to the performance of operations may be transmitted to the Network through/using TRP 1 (and/or TRP 2).

The UE may receive configuration information related to TRP-based transmission/reception through/using TRP 1 (and/or TRP 2) from the Network (S1001). The setting information may include information related to network configuration (ie, TRP configuration), resource allocation related to multiple TRP-based transmission and reception, and the like. In this case, the configuration information may be delivered through higher layer signaling (eg, RRC signaling, MAC-CE, etc.). In addition, when the setting information is predefined or set, the corresponding step may be omitted.

For example, the setting information is as described in the above-described methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1). Likewise, CORESET-related setting information (eg, ControlResourceSet IE) may be included. The CORESET-related setting information may include a CORESET-related ID (eg, controlResourceSetID), an index of the CORESET pool for CORESET (eg, CORESETPoolIndex), time/frequency resource setting of CORESET, TCI information related to CORESET, etc. have. The index of the CORESET pool (eg, CORESETPoolIndex) may mean a specific index mapped/set to each CORESET (eg, CORESET group index, HARQ codebook index).

For example, as described in the above-described methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1), the setting Information related to CSI reporting configuration information (eg, CSI reporting configuration (CSI-ReportConfig) / CSI resource configuration (CSI-ResourceConfig) / NZP CSI-RS resource set information (NZP-CSI-RS-ResourceSet) / NZP CSI) -RS resource information (NZP-CSI-RS-Resource, etc.)/resource configuration information/precoding matrix related indication/codebook related configuration, etc. may be included.

For example, a plurality of different NZP CSI-RS resources may be configured in a single report setting/single CSI report setting (eg, CSI-ReportConfig). Here, the plurality of NZP CSI-RS resources may all be resources for channel measurement. Alternatively, some may be resource(s) for channel measurement, and the rest may be resource(s) for interference measurement.

In addition, as described in the above-described methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1), a plurality of CSI- The CSI may be calculated based on an individual number of ranks and/or a precoding matrix for each of the RS resources. To this end, the configuration information may include independent/individual configuration information for each of a plurality of CSI-RS resources. For example, the configuration information is a plurality of CSI-RSs so that the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources. It may include an individual rank number and/or precoding matrix information for each of the resources. For example, in order to set an individual rank number and/or a precoding matrix for each of the plurality of CSI-RS resources, the configuration information is a codebook associated with each of the plurality of CSI-RS resources settings (eg, CodebookConfig).

And, for example, since the configuration information includes a plurality of CSI resource configurations (eg, CSI-ResourceConfig), the plurality of CSI-RS resources may be configured in each CSI resource configuration. Alternatively, the configuration information includes one CSI resource configuration (eg, CSI-ResourceConfig), and the plurality of CSI-RS resources are one in each of a plurality of CSI-RS resource sets in the one CSI resource configuration. may be set. Alternatively, the configuration information related to the CSI report includes one CSI resource configuration (eg, CSI-ResourceConfig), and the plurality of CSI-RSs in one CSI-RS resource set in the one CSI resource configuration Resources may be established.

The UE may receive DCI through/using TRP 1 from the Network (S1002). Also, DCI may be transmitted through a control channel (eg, PDCCH, etc.). Although an example of a single DCI-based MTRP operation is mainly described in FIG. 10, of course, it can also be applied to multiple DCI-based MTRP operations. In this case, the UE may receive DCI 1 through/using TRP 1 from the network, and receive DCI 2 through/using TRP2.

For example, as described in the above-described methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1), the DCI may include scheduling information of an uplink channel (eg, PUCCH/PUSCH)/triggering information of CSI report/MCS/precoding information and a number of layers (Precoding information and number of layers) field. In the case of multiple DCI-based MTRP operations, the information for each TRP may be transmitted in each DCI 1 and DCI 2 .

The UE may perform a procedure related to TRP 2 and CSI (S1003). For example, the CSI-related procedure may include the above-described method (eg, at least one of Examples #1-1, #1-2, #1-3, and #1-4 of Example #1) and/or It may be performed based on the above-described 'CSI-related operation'.

For example, the UE may receive a CSI-related reference signal (eg, CSI-RS) through TRP 2 from the network. The CSI-related reference signal may be transmitted periodically/aperiodically/semi-continuously. For example, the CSI-related reference signal may be received based on the configuration information. In addition, the UE may measure (or calculate) CSI based on a CSI-related reference signal, and report/transmit the CSI to the network through TRP 2 . And, for example, as described in the above-described methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1), The CSI-related procedure for TRP 1 may be performed based on the CSI reported through TRP 2.

In addition, although FIG. 10 exemplifies an operation in which a CSI-related procedure for TRP 2 is performed and a CSI-related procedure for TRP 1 is performed, it is not limited thereto. That is, a CSI-related procedure for TRP 1 may be performed, and a CSI-related procedure for TRP 1 may be performed. Alternatively, CSI-related procedures for TRP 1 and TRP 2 may be performed together (or simultaneously).

The UE may receive a CSI-related reference signal (eg, CSI-RS) through/using TRP 1 from the network (S1004). For example, the above-described method (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) and/or the above-described 'CSI-related Based on 'operation', the CSI-related reference signal may be received. For example, the CSI-related reference signal may be transmitted periodically/aperiodically/semi-continuously. For example, the CSI-related reference signal may be received based on the configuration information. In addition, the UE may receive a CSI-related reference signal (eg, CSI-RS) through/using TRP 2 from the network (S1005). For example, the reference signal transmitted in step S1005 may be a reference signal to which RI/PMI or the like is applied based on the CSI for TRP 2 reported by the UE in step S1003.

For example, according to the above-described method (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1), the plurality of CSI- RS resources are the first CSI-RS resource (ie, CSI-related signal for TRP 2) in which an identity matrix is assumed as a precoding matrix for the CSI calculation and a specific codebook for the CSI calculation. It may include an assumed second CSI-RS resource (ie, a CSI-related signal for TRP 1). Here, as for the CSI-related signal for TRP 2 (ie, the first CSI-RS resource), RI/PMI based on the CSI for TRP 2 reported by the UE in step S1003 may be applied (ie, precoding applied). have.

The UE may perform CSI measurement/calculation (S1006). For example, the CSI measurement/calculation is performed by the above-described method (eg, at least one of Examples #1-1, #1-2, #1-3, and #1-4 of Example #1) and/ Alternatively, it may be performed based on the 'CSI-related operation' described above. For example, CSI may be measured based on the above-described configuration information and/or DCI and/or CSI-related reference signals. For example, the number of ranks configured for the plurality of CSI-RS resources (eg, CSI-RS resource for each TRP) (ie, the number of transmission layers/ports) and/or Based on the precoding matrix information (ie, based on the configuration information), the number of ranks (ie, the number of transmission layers / ports) and / or assumptions about the precoding matrix, etc. CSI may be measured differently applied/assumed. For example, the UE may measure the CSI for TRP 1 based on a CSI-related reference signal received through/using TRP 1 and a CSI-related reference signal received through/using TRP 2 (ie, step S1005). . For example, the CSI-related reference signal received through / using the TRP 2 (ie, step S1005) may be recognized as interference during CSI measurement for TRP 1. Alternatively, each CSI may be measured/calculated based on a CSI-related reference signal received through/using TRP 1 and a CSI-related reference signal received through/using TRP 2 (ie, step S1005).

As described above, here, as for the CSI-related signal for TRP 2 (ie, the first CSI-RS resource), RI/PMI based on the CSI for TRP 2 reported by the UE in step S1003, etc. may be applied. Accordingly, the UE may assume an identity matrix as a precoding matrix for the CSI calculation when calculating CSI for a CSI-related signal (ie, the first CSI-RS resource) for TRP 2 . On the other hand, for the CSI-related signal for TRP 2 (ie, the second CSI-RS resource), a specific codebook may be assumed for CSI calculation. To this end, the configuration information may include a codebook configuration for the second CSI-RS resource (ie, a CSI-related signal for TRP 2).

In addition, the number of antenna ports of the first CSI-RS resource may be assumed as the number of ranks for the CSI calculation for the first CSI-RS resource (ie, the CSI-related signal for TRP 2). Alternatively, a predetermined value may be assumed as the number of ranks for the CSI calculation for the first CSI-RS resource (ie, a CSI-related signal for TRP 2).

The UE may transmit a CSI report to the Network via/using TRP 1 (and/or via/using TRP2) (S1007). The CSI report may be transmitted through an uplink channel (eg, PUCCH/PUSCH). The CSI report may be transmitted periodically/semi-continuously/aperiodically. For example, the CSI is calculated based on the above-described method (eg, at least one of Examples #1-1, #1-2, #1-3, and #1-4 of Example #1). CSI parameters may be included. For example, the CSI may include RI/PMI/CQI/LI/CRI/RSRP/SINR. For example, port selection (port selection) information for a specific CSI-RS resource may be reported more. Here, the specific CSI-RS resource may correspond to the first CSI-RS resource (ie, a CSI-related signal for TRP 2).

As mentioned above, the above-described Network/UE signaling and operation (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) is It may be implemented by an apparatus to be described with reference to FIG. 13 below. For example, the network (eg, TRP 1/TRP 2) may correspond to the first wireless device, and the UE may correspond to the second wireless device, and vice versa may be considered in some cases.

For example, the above-described Network/UE signaling and operation (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) is shown in FIG. 13 . may be processed by one or more processors (eg, 102, 202) of At least one of #1-3 and #1-4) is an instruction/program (eg, instruction, executable code (eg, instruction) for driving at least one processor (eg, 102, 202) of FIG. executable code) in the form of a memory (eg, one or more memories (eg, 104 , 204 ) of FIG. 13 .

11 illustrates an operation of a terminal based on the previously proposed methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) . The example of FIG. 11 is for convenience of description, and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 11 may be omitted depending on circumstances and/or settings. In addition, the terminal in FIG. 11 is only an example, and may be implemented as the device illustrated in FIG. 13 below. For example, the processor 102/202 of FIG. 13 may control to transmit/receive a channel/signal/data/information using the transceiver 106/206, and transmit or receive a channel/signal/ Data/information may be controlled to be stored in the memory 104/204.

Further, the operation of FIG. 11 may be processed by one or

more processors

102 and 202 of FIG. 13 . In addition, the operation of FIG. 11 is a memory in the form of an instruction/program (eg, instruction, executable code) for driving at least one processor (eg, 102 , 202 ) of FIG. 13 . (eg, one or

more memories

104 , 204 of FIG. 13 ).

The terminal may receive configuration information related to the CSI report from the base station (or network) (S1101).

Here, as described in the above-described methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1), the setting information is Configuration information related to CSI reporting (eg, CSI reporting configuration (CSI-ReportConfig)/ CSI resource configuration (CSI-ResourceConfig)/ NZP CSI-RS resource set information (NZP-CSI-RS-ResourceSet)/ NZP CSI-RS) It may include resource information (NZP-CSI-RS-Resource, etc.)/resource configuration information/precoding matrix related indication/codebook related configuration.

The terminal receives a CSI-related signal on a plurality of CSI-RS resources from the base station (or network) (S1102).

Here, the above-described method (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) and/or the above-described 'CSI-related operation' Based on the CSI-related reference signal may be received. For example, the UE may receive a CSI-related reference signal (eg, CSI-RS) through TRP 1 and/or TRP 2. The CSI-related reference signal may be transmitted periodically/aperiodically/semi-continuously. For example, the CSI-related reference signal may be received based on the configuration information.

The plurality of CSI-RS resources are a first CSI-RS resource in which an identity matrix is assumed as a precoding matrix for the CSI calculation and a second CSI-RS resource in which a specific codebook is assumed for the CSI calculation- RS resources may be included. That is, in the case of the first CSI-RS resource, RI/PMI based on the CSI of the previous UE may be applied (ie, precoding application), and accordingly, the UE calculates CSI for the first CSI-RS resource. An identity matrix may be assumed as the precoding matrix. In this case, the terminal may receive the CSI-RS on the third CSI-RS resource from the base station, and transmit the first CSI to the base station based on the CSI-RS received on the third CSI-RS resource, One CSI-RS resource may be transmitted by applying a precoding matrix based on (or corresponding to) PMI in the first CSI.

The UE measures/calculates CSI based on the CSI-RS, and transmits the measured/calculated CSI based on the CSI-RS to the base station (S1103).

For example, the CSI measurement/calculation and CSI reporting are performed by the above-described method (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1). ) and/or the 'CSI-related operation' described above.

For example, CSI may be measured based on the above-described configuration information and/or DCI and/or CSI-related reference signals. For example, the number of ranks configured for the plurality of CSI-RS resources (eg, CSI-RS resource for each TRP) (ie, the number of transmission layers/ports) and/or Based on the precoding matrix information (ie, based on the configuration information), the number of ranks (ie, the number of transmission layers / ports) and / or assumptions about the precoding matrix, etc. CSI may be measured differently applied/assumed.

For example, as the first CSI-RS resource among the plurality of CSI-RS resources, RI/PMI based on CSI reported by a previous UE may be applied. Accordingly, when calculating CSI for the first CSI-RS resource, the UE may assume an identity matrix as a precoding matrix for the CSI calculation. In this case, the terminal may receive the CSI-RS on the third CSI-RS resource from the base station, and transmit the first CSI to the base station based on the CSI-RS received on the third CSI-RS resource, One CSI-RS resource may be transmitted by applying a precoding matrix based on (or corresponding to) PMI in the first CSI.

On the other hand, for the second CSI-RS resource, a specific codebook may be assumed for CSI calculation. To this end, the configuration information may include a codebook configuration for the second CSI-RS resource.

In addition, the number of antenna ports of the first CSI-RS resource may be assumed as the number of ranks for the CSI calculation for the first CSI-RS resource. Alternatively, a predetermined value may be assumed as the number of ranks for the CSI calculation for the first CSI-RS resource.

The CSI is i) one or more CSI-RS resource indicators (CRI: CSI-RS resource indicator), ii) PMI for the second CSI-RS resource, iii) RI (where RI is the second CSI-RS resource) It may be an RI for RI or a full RI for resources selected by the CRI) and/or iv) may include at least one of CQI. In addition, the PMI and/or RI for the first CSI-RS resource in the CSI may not be included. In addition, it may include port selection information (eg, a port index) for the first CSI-RS resource in the CSI.

12 illustrates an operation of a base station based on the previously proposed methods (eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1) . The example of FIG. 12 is for convenience of description, and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 12 may be omitted depending on circumstances and/or settings. In addition, the base station in FIG. 12 is only one example, and may be implemented with the apparatus illustrated in FIG. 13 below. For example, the processor 102/202 of FIG. 13 may control to transmit/receive a channel/signal/data/information using the transceiver 106/206, and transmit or receive a channel/signal/ Data/information may be controlled to be stored in the memory 104/204.

Also, the operation of FIG. 12 may be processed by one or

more processors

102 and 202 of FIG. 13 . In addition, the operation of FIG. 12 is a memory in the form of an instruction/program (eg, instruction, executable code) for driving at least one processor (eg, 102 and 202 ) of FIG. 13 . (eg, one or

more memories

104 , 204 of FIG. 13 ).

The base station (or network) may transmit configuration information related to the CSI report to the terminal (S1201).

The base station (or network) transmits a CSI-related signal to the terminal on a plurality of CSI-RS resources (S1202).

The base station receives the CSI measured/calculated based on the CSI-RS by the terminal from the terminal (S1203).

General device to which the present disclosure can be applied

Referring to FIG. 13 , the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE, NR).

The first wireless device 100 includes one or more processors 102 and one or more memories 104 , and may further include one or more transceivers 106 and/or one or more antennas 108 . The processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. For example, the processor 102 may process information in the memory 104 to generate first information/signal, and then transmit a wireless signal including the first information/signal through the transceiver 106 . In addition, the processor 102 may receive the radio signal including the second information/signal through the transceiver 106 , and then store information obtained from signal processing of the second information/signal in the memory 104 . The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102 . For example, memory 104 may provide instructions for performing some or all of the processes controlled by processor 102 , or for performing descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled to the processor 102 , and may transmit and/or receive wireless signals via one or more antennas 108 . The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may refer to a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 , one or more memories 204 , and may further include one or more transceivers 206 and/or one or more antennas 208 . The processor 202 controls the memory 204 and/or the transceiver 206 , and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this disclosure. For example, the processor 202 may process the information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206 . In addition, the processor 202 may receive the radio signal including the fourth information/signal through the transceiver 206 , and then store information obtained from signal processing of the fourth information/signal in the memory 204 . The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202 . For example, the memory 204 may provide instructions for performing some or all of the processes controlled by the processor 202 , or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. may store software code including Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 . The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may refer to a communication modem/circuit/chip.

Hereinafter, hardware elements of the

wireless devices

100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or

more processors

102 , 202 . For example, one or

more processors

102 , 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or

more processors

102 and 202 are configured to process one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, function, procedure, proposal, method, and/or operational flowcharts disclosed in the present disclosure. can create One or

more processors

102 , 202 may generate messages, control information, data, or information according to the description, function, procedure, proposal, method, and/or flow charts disclosed in this disclosure. The one or

more processors

102, 202 may transmit a signal (eg, a baseband signal) including a PDU, SDU, message, control information, data or information according to a function, procedure, proposal and/or method disclosed in the present disclosure. generated and provided to one or more transceivers (106, 206). The one or

more processors

102 , 202 may receive signals (eg, baseband signals) from one or

more transceivers

106 , 206 , the descriptions, functions, procedures, proposals, methods and/or methods disclosed in this disclosure. PDU, SDU, message, control information, data or information may be obtained according to the operation flowcharts.

One or

more processors

102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or

more processors

102 , 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or

more processors

102 , 202 . The descriptions, functions, procedures, proposals, methods, and/or flowcharts of operations disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, proposals, methods, and/or flowcharts of operations disclosed in the present disclosure may include firmware or software configured to perform one or

more processors

102 , 202 , or stored in one or

more memories

104 , 204 . It may be driven by the

above processors

102 and 202 . The descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed in this disclosure may be implemented using firmware or software in the form of code, instructions, and/or a set of instructions.

One or

more memories

104 , 204 may be coupled with one or

more processors

102 , 202 , and may store various forms of data, signals, messages, information, programs, code, instructions, and/or instructions. The one or

more memories

104 and 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. One or

more memories

104 , 204 may be located inside and/or external to one or

more processors

102 , 202 . Additionally, one or

more memories

104 , 204 may be coupled to one or

more processors

102 , 202 through various technologies, such as wired or wireless connections.

One or

more transceivers

106 , 206 may transmit user data, control information, radio signals/channels, etc. referred to in the methods and/or operational flowcharts of the present disclosure, to one or more other devices. The one or

more transceivers

106, 206 may receive user data, control information, radio signals/channels, etc. referred to in the descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed in this disclosure, etc., from one or more other devices. have. For example, one or

more transceivers

106 , 206 may be coupled to one or

more processors

102 , 202 and may transmit and receive wireless signals. For example, one or

more processors

102 , 202 may control one or

more transceivers

106 , 206 to transmit user data, control information, or wireless signals to one or more other devices. In addition, one or

more processors

102 , 202 may control one or

more transceivers

106 , 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or

more transceivers

106 , 206 may be coupled with one or

more antennas

108 , 208 , and the one or

more transceivers

106 , 206 may be coupled via one or

more antennas

108 , 208 to the descriptions, functions, and functions disclosed in this disclosure. , may be set to transmit and receive user data, control information, radio signals/channels, etc. mentioned in procedures, proposals, methods and/or operation flowcharts. In the present disclosure, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or

more transceivers

106, 206 convert the received radio signal/channel, etc. from the RF band signal to process the received user data, control information, radio signal/channel, etc. using the one or

more processors

102, 202. It can be converted into a baseband signal. One or

more transceivers

106 , 206 may convert user data, control information, radio signals/channels, etc. processed using one or

more processors

102 , 202 from baseband signals to RF band signals. To this end, one or

more transceivers

106 , 206 may include (analog) oscillators and/or filters.

The embodiments described above are those in which elements and features of the present disclosure are combined in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to configure embodiments of the present disclosure by combining some components and/or features. The order of operations described in embodiments of the present disclosure may be changed. Some features or features of one embodiment may be included in another embodiment, or may be replaced with corresponding features or features of another embodiment. It is apparent that claims that are not explicitly cited in the claims can be combined to form an embodiment or included as a new claim by amendment after filing.

It is apparent to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the essential characteristics of the present disclosure. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present disclosure should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure are included in the scope of the present disclosure.

The scope of the present disclosure includes software or machine-executable instructions (eg, operating system, application, firmware, program, etc.) that cause operation according to the method of various embodiments to be executed on a device or computer, and such software or and non-transitory computer-readable media in which instructions and the like are stored and executable on a device or computer. Instructions that can be used to program a processing system to perform the features described in this disclosure may be stored on/in a storage medium or computer-readable storage medium, and can be viewed using a computer program product including such storage medium. Features described in the disclosure may be implemented. Storage media may include, but are not limited to, high-speed random access memory such as DRAM, SRAM, DDR RAM or other random access solid state memory device, one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or may include non-volatile memory, such as other non-volatile solid state storage devices. The memory optionally includes one or more storage devices located remotely from the processor(s). The memory or alternatively the non-volatile memory device(s) within the memory includes a non-transitory computer-readable storage medium. Features described in this disclosure may be stored on any one of the machine readable media to control hardware of a processing system and cause the processing system to interact with other mechanisms that utilize results in accordance with embodiments of the present disclosure. It may be incorporated into software and/or firmware. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments/containers.

Here, the wireless communication technology implemented in the

wireless devices

100 and 200 of the present disclosure may include a narrowband Internet of Things for low-power communication as well as LTE, NR, and 6G. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and is limited to the above-mentioned names. no. Additionally or alternatively, the wireless communication technology implemented in the wireless devices (XXX, YYY) of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN technology, and may be called various names such as enhanced machine type communication (eMTC). For example, LTE-M technology is 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) may be implemented in at least one of various standards such as LTE M, and is not limited to the above-described name. Additionally or alternatively, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present disclosure is at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) in consideration of low power communication. It may include any one, and is not limited to the above-mentioned names. For example, the ZigBee technology can create PAN (personal area networks) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

Although the method proposed in the present disclosure has been described focusing on examples applied to 3GPP LTE/LTE-A and 5G systems, it is possible to apply to various wireless communication systems in addition to 3GPP LTE/LTE-A and 5G systems.

Claims

In a method for transmitting channel state information (CSI) in a wireless communication system, the method performed by a terminal comprises:

Receiving configuration information related to the CSI report from the base station;

receiving a CSI-RS on a plurality of channel state information-reference signal (CSI-RS) resources from the base station; and

Transmitting the CSI calculated based on the CSI-RS to the base station,

The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report,

Based on the configuration information related to the CSI report, the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources. Method .
According to claim 1,

The configuration information related to the CSI report is configured such that the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources. - A method comprising codebook settings associated with each of the RS resources.
According to claim 1,

The plurality of CSI-RS resources are a first CSI-RS resource in which an identity matrix is assumed as a precoding matrix for the CSI calculation and a second CSI-RS resource in which a specific codebook is assumed for the CSI calculation- A method comprising an RS resource.
4. The method of claim 3,

The CSI does not include a precoding matrix indicator (PMI) for the first CSI-RS resource, the method.
4. The method of claim 3,

For the first CSI-RS resource, the number of antenna ports of the first CSI-RS resource is assumed as the number of ranks for the CSI calculation.
4. The method of claim 3,

A predetermined value is assumed as the number of ranks for the CSI calculation for the first CSI-RS resource.
4. The method of claim 3,

The CSI is i) one or more CSI-RS resource indicators (CRI: CSI-RS resource indicator), ii) PMI for the second CSI-RS resource, iii) rank indicator (RI: rank indicator) and / or iv) A method comprising at least one of a channel quality indicator (CQI).
8. The method of claim 7,

The RI is the RI for the second CSI-RS resource or the entire RI for the resources selected by the CRI.
8. The method of claim 7,

The CSI includes port selection information for the first CSI-RS resource.
According to claim 1,

The plurality of CSI-RS resources are configured by the configuration information related to the CSI report including configuration of a plurality of CSI resources.
According to claim 1,

The configuration information related to the CSI report includes one CSI resource configuration, and the plurality of CSI-RS resources are configured one by one in each of a plurality of CSI-RS resource sets in the one CSI resource configuration.
According to claim 1,

The configuration information related to the CSI report includes one CSI resource configuration, and the plurality of CSI-RS resources are configured in one CSI-RS resource set in the one CSI resource configuration.
4. The method of claim 3,

receiving a CSI-RS on the third CSI-RS resource from the base station; and

Further comprising the step of transmitting the first CSI to the base station based on the CSI-RS received on the third CSI-RS resource,

The first CSI-RS resource is transmitted by applying a precoding matrix corresponding to the PMI in the first CSI.
A terminal for transmitting channel state information (CSI) in a wireless communication system, the terminal comprising:

one or more transceivers for transmitting and receiving radio signals; and

One or more processors for controlling the one or more transceivers,

The one or more processors include:

receiving configuration information related to CSI reporting from the base station;

receive a CSI-RS on a plurality of channel state information-reference signal (CSI-RS) resources from the base station; and

It is configured to transmit CSI calculated based on the CSI-RS to the base station,

The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report,

Based on the configuration information related to the CSI report, the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources, the terminal .
One or more non-transitory computer readable media storing one or more instructions, the computer readable medium comprising:

The one or more instructions executed by one or more processors may include: an apparatus for transmitting channel state information (CSI):

receiving configuration information related to CSI reporting from the base station;

receive a CSI-RS on a plurality of channel state information-reference signal (CSI-RS) resources from the base station; and

Controlling the CSI calculated based on the CSI-RS to be transmitted to the base station,

The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report,

Based on the configuration information related to the CSI report, the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources, a computer readable medium.
A processing apparatus configured to control a terminal to transmit channel state information (CSI) in a wireless communication system, the processing apparatus comprising:

one or more processors; and

one or more computer memories operatively coupled to the one or more processors and storing instructions for performing operations upon being executed by the one or more processors;

The actions are:

Receiving configuration information related to the CSI report from the base station;

receiving a CSI-RS on a plurality of channel state information-reference signal (CSI-RS) resources from the base station; and

Transmitting the CSI calculated based on the CSI-RS to the base station,

The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report,

Based on the configuration information related to the CSI report, the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources, processing Device.
A method for receiving channel state information (CSI) in a wireless communication system, the method performed by a base station comprising:

transmitting configuration information related to CSI reporting to the terminal;

transmitting a CSI-RS to the terminal on a plurality of channel state information-reference signal (CSI-RS) resources; and

Receiving the CSI calculated based on the CSI-RS from the terminal,

The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report,

Based on the configuration information related to the CSI report, the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources. Method .
A base station for receiving channel state information (CSI) in a wireless communication system, the base station comprising:

one or more transceivers for transmitting and receiving radio signals; and

One or more processors for controlling the one or more transceivers,

The one or more processors include:

transmit configuration information related to CSI reporting to the terminal;

transmitting a CSI-RS to the terminal on a plurality of channel state information-reference signal (CSI-RS) resources; and

It is configured to receive CSI calculated based on the CSI-RS from the terminal,

The plurality of CSI-RS resources for channel measurement are configured by the configuration information related to the CSI report,

Based on the configuration information related to the CSI report, the CSI is calculated based on the number of individual ranks and/or precoding matrix information configured for each of the plurality of CSI-RS resources. Base station .