WO2022031077A1 - Procédé et dispositif d'émission et de réception d'informations d'état de canal dans un système de communication sans fil - Google Patents

Procédé et dispositif d'émission et de réception d'informations d'état de canal dans un système de communication sans fil Download PDF

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WO2022031077A1
WO2022031077A1 PCT/KR2021/010338 KR2021010338W WO2022031077A1 WO 2022031077 A1 WO2022031077 A1 WO 2022031077A1 KR 2021010338 W KR2021010338 W KR 2021010338W WO 2022031077 A1 WO2022031077 A1 WO 2022031077A1
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Prior art keywords
csi
resource
resources
base station
trp
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PCT/KR2021/010338
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English (en)
Korean (ko)
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김규석
김형태
강지원
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • 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.
  • the mobile communication system has expanded its scope to not only voice but also data service.
  • 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.
  • next-generation mobile communication system 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.
  • Dual Connectivity Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Wideband
  • MIMO Massive Multiple Input Multiple Output
  • NOMA Non-Orthogonal Multiple Access
  • An object of the present disclosure is to provide a method and apparatus for transmitting and receiving channel state information.
  • 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.
  • CSI-RS channel state information reference signal
  • 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.
  • a method for transmitting channel state information (CSI) in a wireless communication system 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) 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.
  • TRPs transmission reception points
  • 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).
  • TRPs transmission reception points
  • wireless communication system performance may be improved by acquiring/reporting optimal channel state information for performing transmission of multiple transmission reception points (TRPs).
  • TRPs transmission reception points
  • FIG. 1 illustrates a structure of a wireless communication system to which the present disclosure can be applied.
  • FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.
  • FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.
  • FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.
  • FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.
  • FIG. 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.
  • FIG. 7 illustrates a multiple TRP transmission scheme in a wireless communication system to which the present disclosure can be applied.
  • FIG 8 illustrates CSI reporting in a wireless communication system to which the present disclosure may be applied.
  • FIG 9 illustrates a CSI reporting procedure according to an embodiment of the present disclosure.
  • FIG. 10 illustrates a signaling procedure between a network and a terminal according to an embodiment of the present disclosure.
  • FIG. 11 illustrates an operation of a terminal for transmitting channel state information according to an embodiment of the present disclosure.
  • FIG. 12 illustrates an operation of a base station for transmitting channel state information according to an embodiment of the present disclosure.
  • FIG. 13 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present disclosure.
  • a component 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.
  • 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 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.
  • a device eg, a base station
  • transmitting or receiving a channel includes the meaning of transmitting or receiving information or a signal through a corresponding channel.
  • transmitting the control channel means transmitting control information or a signal through the control channel.
  • transmit a data channel means to transmit data information or a signal over the data channel.
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station
  • DL downlink
  • UL uplink
  • the transmitter may be a part of the base station
  • the receiver may be a part of the terminal
  • the transmitter may be a part of the terminal
  • the receiver may be a part of the base station.
  • the base station may be represented as a first communication device
  • the terminal may be represented as a second communication device.
  • Base station 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.
  • BS Base station
  • Node B evolved-NodeB
  • gNB Next Generation NodeB
  • BTS base transceiver system
  • AP Access Point
  • 5G network
  • AI Artificial Intelligence
  • RSU road side unit
  • robot robot
  • drone UAV: Unmanned Aerial Vehicle
  • AR Algmented Reality
  • VR Virtual Reality
  • the 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.
  • AI artificial intelligence
  • UAV unmanned aerial vehicle
  • AR augmented reality
  • VR virtual reality
  • 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).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • 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 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.
  • LTE refers to technology after 3GPP Technical Specification (TS) 36.xxx Release 8.
  • TS Technical Specification
  • LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A
  • 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.
  • 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
  • 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
  • channel quality indicator channel quality indicator
  • channel state information - reference signal resource indicator channel state information - reference signal resource indicator
  • channel state information channel state information
  • channel state information - interference measurement channel state information - interference measurement
  • channel state information - reference signal channel state information - reference signal
  • demodulation reference signal demodulation reference signal
  • interleaved frequency division multiple access (interleaved frequency division multiple access)
  • first layer reference signal received power (Layer 1 reference signal received power)
  • first layer reference signal received quality (Layer 1 reference signal received quality)
  • PDCCH physical downlink control channel (physical downlink control channel)
  • precoding matrix indicator precoding matrix indicator
  • radio resource control radio resource control
  • 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))
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • tracking reference signal tracking reference signal
  • 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.
  • the new RAT system may support a larger system bandwidth (eg, 100 MHz) while following the existing numerology of LTE/LTE-A.
  • 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.
  • different numerology can be defined.
  • FIG. 1 illustrates a structure of a wireless communication system to which the present disclosure can be applied.
  • 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.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.
  • An NR system can support multiple numerologies.
  • numerology may be defined by subcarrier spacing and cyclic prefix (CP) overhead.
  • CP cyclic prefix
  • a plurality of subcarrier spacings may be derived by scaling the basic (reference) subcarrier spacing to an integer N (or ⁇ ).
  • 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.
  • various frame structures according to multiple numerologies may be supported.
  • 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.
  • 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.
  • FR2 may mean a millimeter wave (mmW: millimeter wave).
  • ⁇ f max 480 ⁇ 10 3 Hz
  • N f 4096.
  • slots are numbered in increasing order of n s ⁇ ⁇ 0,..., N slot subframe, ⁇ -1 ⁇ within the subframe, and within the radio frame They are numbered in increasing order of n s,f ⁇ ⁇ 0,..., N slot frame, ⁇ -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 ⁇ in a subframe is temporally aligned with the start of the OFDM symbol n s ⁇ 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, ⁇ ), and the number of slots per subframe (N slot subframe, ⁇ ) 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.
  • 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.
  • a mini-slot may contain 2, 4 or 7 symbols, or may contain more or fewer symbols.
  • an antenna port antenna port
  • resource grid resource grid
  • resource element resource element
  • resource block resource block
  • carrier part carrier part
  • 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.
  • 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.
  • the wide range characteristic includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.
  • the resource grid is composed of N RB ⁇ N sc RB subcarriers in the frequency domain and that one subframe is composed of 14 ⁇ 2 ⁇ OFDM symbols, but limited to this it is not going to be
  • a transmitted signal is described by one or more resource grids consisting of N RB ⁇ N sc RB subcarriers and OFDM symbols of 2 ⁇ N symb ( ⁇ ) .
  • N RB ⁇ N RB max, ⁇ The N RB max, ⁇ represents the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.
  • one resource grid may be configured for each ⁇ and each antenna port p.
  • Each element of the resource grid for ⁇ and antenna port p is referred to as a resource element, and is uniquely identified by an index pair (k,l').
  • l' 0,...,2 ⁇ N symb ( ⁇ ) -1 is a symbol in a subframe indicates the location of
  • an index pair (k,l) is used.
  • l 0,...,N symb ⁇ -1 .
  • a resource element (k,l') for ⁇ and an antenna port p corresponds to a complex value a k,l' (p, ⁇ ) .
  • indices p and ⁇ may be dropped, so that the complex value is a k,l' (p) or a k,l' can be
  • 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 are numbered upwards from 0 in the frequency domain for the subcarrier interval setting ⁇ .
  • the center of subcarrier 0 of common resource block 0 for subcarrier interval setting ⁇ coincides with 'point A'.
  • the relationship between the common resource block number n CRB ⁇ and the resource element (k,l) for the subcarrier interval setting ⁇ in the frequency domain is given by Equation 1 below.
  • Physical resource blocks are numbered from 0 to N BWP,i size, ⁇ -1 in the bandwidth part (BWP: bandwidth part), and i is the number of the BWP.
  • BWP bandwidth part
  • i the number of the BWP.
  • Equation 2 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, ⁇ is a common resource block in which BWP starts relative to common resource block 0.
  • FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.
  • FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.
  • 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.
  • RE resource element
  • 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.
  • a radio frequency (RF) chip for the entire CC turned on, battery consumption of the terminal may increase.
  • RF radio frequency
  • different numerology eg, subcarrier spacing, etc.
  • the capability for the maximum bandwidth may be different for each terminal.
  • 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).
  • 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.
  • some UEs may be configured as a different BWP for load balancing.
  • 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.).
  • the base station may indicate switching to another configured DL/UL BWP (by L1 signaling or MAC CE or RRC signaling, etc.).
  • the timer value expires based on the timer, it may be switched to a predetermined DL/UL BWP.
  • the activated DL/UL BWP is defined as an active DL/UL BWP.
  • 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.
  • FIG. 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.
  • 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.
  • the terminal 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.
  • PSS primary synchronization signal
  • SSS secondary synchronization channel
  • ID cell identifier
  • the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain intra-cell broadcast information.
  • PBCH physical broadcast channel
  • the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • the UE 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).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Control Channel
  • the terminal may perform a random access procedure (RACH) for the base station (steps S603 to S606).
  • RACH random access procedure
  • 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).
  • PRACH Physical Random Access Channel
  • a contention resolution procedure may be additionally performed.
  • the UE 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.
  • the UE receives downlink control information (DCI) through the PDCCH.
  • DCI downlink control information
  • 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.
  • 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.
  • 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 format uses 0_0 Scheduling of PUSCH in one cell 0_1 Scheduling of one or multiple PUSCHs in one cell, or indication of cell group (CG) downlink feedback information to the UE 0_2 Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one DL cell 1_1 Scheduling of PDSCH in one cell 1_2 Scheduling of PDSCH in one cell
  • 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.
  • PUSCH scheduling eg, UL/SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.
  • 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.
  • CRC cyclic redundancy check
  • C-RNTI Cell Radio Network Temporary Identifier
  • CS-RNTI Configured Scheduling RNTI
  • MCS-C-RNTI Modulation Coding Scheme Cell RNTI
  • 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.
  • 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.
  • 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
  • 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-RS channel state information-reference signal
  • time/frequency tracking time/frequency tracking
  • CSI calculation computation
  • L1 (layer 1)-reference signal received (RSRP) power is used for computation and mobility.
  • 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.
  • 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.
  • RRC radio resource control
  • 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.
  • CSI-IM interference management
  • 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.
  • 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.
  • parameters indicating the use of CSI-RS for each NZP CSI-RS resource set may be set.
  • Table 6 illustrates an NZP CSI-RS resource set information element (IE: information element) for NZP CSI-RS resource set configuration.
  • IE information element
  • 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
  • the repetition parameter corresponding to the upper layer parameter corresponds to 'CSI-RS-ResourceRep' of the first layer (L1: layer 1) parameter.
  • the repetition parameter corresponding to the upper layer parameter corresponds to 'CSI-RS-ResourceRep' of the first layer (L1: layer 1) parameter.
  • 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.
  • 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, pu
  • 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.
  • 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.
  • 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
  • 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.
  • the terminal may omit the report.
  • the terminal may report to the base station.
  • the quantity is set to 'none', it is when aperiodic TRS is triggered or when repetition is set.
  • the report of the terminal may be omitted.
  • the NR system supports more flexible and dynamic CSI measurement and reporting.
  • the CSI measurement may include a procedure of receiving a CSI-RS and acquiring CSI by computing the received CSI-RS.
  • CM periodic/semi-persistent/periodic channel measurement
  • IM interference measurement
  • 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.
  • the base station or network 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.
  • 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.
  • S represents the number of configured CSI-RS resource sets.
  • 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.
  • resourceType For Periodic and semi-persistent CSI resource setting, the number of set CSI-RS resource sets (S) is limited to '1'.
  • S 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.
  • the same time domain behavior is configured for the CSI-ResourceConfig.
  • the same time domain behavior is configured for the CSI-ResourceConfig.
  • CM channel measurement
  • IM interference measurement
  • a channel measurement resource may be an NZP CSI-RS for CSI acquisition
  • an interference measurement resource may be a CSI-IM and an NZP CSI-RS for IM.
  • CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.
  • 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 can mean a resource set list.
  • 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.
  • One reporting setting can be connected with up to three resource settings.
  • the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is for channel measurement for L1-RSRP computation.
  • 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.
  • the first resource setting (given by resourcesForChannelMeasurement) is for channel measurement
  • the second resource setting (given by csi-IM-ResourcesForInterference) is for CSI-IM based interference measurement
  • the third resource setting (given by nzp-CSI-RS-ResourcesForInterference) is for NZP CSI-RS based interference measurement.
  • each CSI-ReportConfig is linked to a periodic or semi-persistent resource setting.
  • the resource setting is for channel measurement for L1-RSRP computation.
  • the first resource setting (given by resourcesForChannelMeasurement) is for channel measurement
  • the second resource setting (given by the higher layer parameter csi-IM-ResourcesForInterference) is performed on CSI-IM It is used for interference measurement.
  • 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.
  • 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.
  • the UE assumes the following.
  • Each NZP CSI-RS port configured for interference measurement corresponds to an interfering transport layer.
  • NZP CSI-RS resource for channel measurement NZP CSI-RS resource for measuring interference
  • CSI-IM resource for measuring interference CSI-IM resource for measuring interference
  • time and frequency resources available to the UE are controlled by the base station.
  • CSI channel state information
  • CQI channel quality indicator
  • precoding matrix indicator precoding matrix indicator
  • PMI CSI-RS resource indicator
  • SSBRI SS / PBCH block resource indicator
  • layer It may include at least one of indicator (LI), rank indicator (RI) or 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.
  • aperiodicTriggerStateList each trigger state includes a channel and optionally an associated CSI-ReportConfigs list indicating resource set IDs for interference.
  • semiPersistentOnPUSCH-TriggerStateList each trigger state includes one associated CSI-ReportConfig.
  • time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic.
  • Periodic CSI reporting period (periodicity) and slot offset (slot offset) may be set in RRC, refer to the CSI-ReportConfig IE.
  • SP sin-periodic CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH.
  • 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).
  • DCI format 0_1
  • SP-CSI C-RNTI SP-CSI C-RNTI
  • 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.
  • aperiodic CSI reporting is performed on PUSCH and is triggered by DCI.
  • information related to the trigger of aperiodic CSI reporting may be delivered/indicated/configured through the MAC-CE.
  • AP CSI-RS timing is set by RRC, and timing for AP CSI reporting is dynamically controlled by DCI.
  • NR 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 are defined in terms of CSI computation complexity.
  • 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.
  • Z, Z ' is defined in the unit of OFDM symbols.
  • Z represents the minimum CSI processing time from receiving an aperiodic CSI triggering DCI to performing CSI reporting.
  • Z' represents the minimum CSI processing time from receiving CSI-RS for channel/interference to performing CSI reporting.
  • the UE reports the number of CSIs that can be simultaneously calculated.
  • the UE calculates the CSI parameters (if reported) by assuming the dependency (dependency) between the following CSI parameters (if reported).
  • 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.
  • the two antenna ports are QC/QCL (quasi co-located or quasi co-location) ) can be said to be in a relationship.
  • 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).
  • the Spatial Rx parameter means a spatial (reception) channel characteristic parameter such as an angle of arrival.
  • 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.
  • DM-RS demodulation reference signal
  • 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.
  • 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:
  • 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
  • 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.
  • 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.
  • 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.
  • M-DCI multiple DCI
  • S-DCI single DCI
  • 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.
  • the method for UL transmission eg, PUSCH/PUCCH
  • UL transmission eg, PUSCH/PUCCH
  • UL transmission eg, PUSCH/PUCCH
  • 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.
  • 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.
  • the CORESET group ID may be specific index information defined in CORSET configuration.
  • the CORESET group may be set/indicated/defined by an index defined in the CORESET configuration for each CORESET.
  • the CORESET group ID may mean an index/identification information/indicator for classification/identification between CORESETs set/related to each TRP/panel.
  • 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.
  • L2 signaling eg, MAC-CE
  • L1 signaling eg, DCI
  • 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.
  • an upper layer parameter a ControlResourceSet information element (IE), is used to set a time/frequency control resource set (CORESET).
  • 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
  • the index of the CORESET pool (eg, CORESETPoolIndex) may be set to 0 or 1.
  • a CORESET group may correspond to a CORESET pool
  • a CORESET group ID may correspond to a CORESET pool index (eg, CORESETPoolIndex).
  • the following two methods can be considered as a transmission/reception method for improving reliability using transmission in multiple TRPs.
  • FIG. 7 illustrates a multiple TRP transmission scheme in a wireless communication system to which the present disclosure can be applied.
  • the layer group may mean a predetermined layer set consisting of one or more layers.
  • 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.
  • FIG. 7(b) an example of transmitting different CWs through layer groups corresponding to different TRPs is shown.
  • 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.
  • the code rate corresponding to the TB is high.
  • 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
  • RV redundancy version
  • 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.
  • 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
  • SDM spatial division multiplexing
  • FDM F division multiplexing
  • TDM time division multiplexing
  • Multi-TRP scheduled by at least one DCI, may be performed as follows:
  • Scheme 1 (n is a natural number) TCI states in a single slot in overlapping time and frequency resource allocation
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • TDM Technique 3
  • 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.
  • TDM Technique 4
  • 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).
  • M-TRP multi-TRP
  • FIG 8 illustrates CSI reporting in a wireless communication system to which the present disclosure may be applied.
  • 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.
  • CSI e.g., CRI / RI / PMI / CQI / LI
  • 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.
  • SINR signal to interference plus noise ratio
  • Equation 3 illustrates the calculation of the SINR value for TRP#1
  • Equation 4 illustrates the calculation of the SINR value for TRP#2
  • 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.
  • 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.
  • a specific CQI value may be selected based on the SINR estimated using the CSI-RS.
  • the base station cannot accurately know the actual SINR (ie, CQI) of the terminal when transmitting the M-TRP.
  • MCS modulation and coding scheme
  • Equation 5 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.
  • accurate CSI eg, CQI value
  • TRP1/TRP2 two TRPs
  • TRP in the present disclosure may be for convenience of description, and TRP may also be interpreted in terms such as panel/beam.
  • the first layer (L1: layer 1) signaling may mean DCI-based dynamic signaling between the base station and the terminal
  • 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).
  • transmitting/receiving a (NZP) CSI-RS resource may be interpreted as meaning transmitting/receiving a CSI-RS on a corresponding (NZP) CSI-RS resource.
  • Embodiment #1 The base station may configure different NZP CSI-RS resources in a single reporting setting to the terminal.
  • 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.
  • CSI eg, RI/PMI/CQI, etc.
  • 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.
  • 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.
  • 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).
  • codebookConfig a codebook type for a related PMI report is identified using a combination of a codebookType and a subtype.
  • 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) /
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the base station may set the restriction on the RI through the 'typeII-PortSelectionRI-Restriction-r16' parameter.
  • 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.
  • codebookConfig codebook configuration
  • the UE may calculate the CQI based on/under the PMI and/or RI reported to the base station.
  • codebookConfig parameters in the CSI reporting settings for each NZP CSI-RS resource can be set.
  • 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.
  • RSRP reference signal received power
  • 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.
  • 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).
  • CSI-ReportConfig refers to 'CSI-ReportConfig', which is a higher layer parameter (ie, information element (IE)) for setting the characteristics of CSI reporting.
  • 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).
  • 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.
  • 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.).
  • codebook type eg, Type I
  • Type II codebook etc.
  • information not mentioned above may also be included in the CSI-ReportConfig.
  • 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.
  • 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').
  • CSI-ReportConfig a type II port selection
  • 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.
  • 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.
  • CSI-IM resource csi-IM-ResourcesForInterference
  • nzp-CSI-RS-ResourcesForInterference the CSI report configuration
  • 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.
  • a specific NZP CSI-RS resource hereinafter, referred to as a first CSI resource
  • a specific scaling value is applied
  • a specific codebook eg, Type I/ (enhanced) Type II codebook, etc.
  • the second CSI resource it may be configured/indicated/defined so that the UE reports a specific RI/PMI for the specific codebook.
  • the UE may not report the PMI (and/or RI) to the base station for the first CSI resource.
  • 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 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'.
  • the number of ranks may be set/indicated/defined to be applied as a fixed value when the UE calculates CSI.
  • 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.
  • 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.
  • the UE 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.
  • 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.
  • Embodiment #1-3 In the above embodiment, an example of a value reported by the terminal to the base station may be as follows.
  • one or more CRI values, and / or a specific 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.
  • port selection (port selection) information may be reported.
  • 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)
  • / or RI the specific codebook type (codebook type) may correspond to a set / indicated / defined resource.
  • the total RI value for resources selected as CRI), and / or CQI, and / or A specific 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.
  • the resource setting ('resource setting') may mean CSI-ResourceConfig which is a higher layer parameter/IE for setting CSI resource characteristics.
  • CM channel measurement
  • IM interference measurement
  • each resource may be set as a resource setting for channel measurement and a resource setting for interference measurement.
  • each resource may be set as a resource setting for CM.
  • each resource may be set based on a single/plural resource setting.
  • setting a different NZP CSI-RS resource in a single reporting setting / CSI reporting setting 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.
  • 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.
  • ID identity
  • CSI-ResourceConfigID index associated with different CSI resource settings
  • CORESETPoolIndex TRP ID / CORESET pool index
  • 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.
  • 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.
  • the first index and the second index associated with the CSI resource configuration may correspond to the first TRP and the second TRP, respectively.
  • 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.
  • resource setting / CSI resource configuration 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).
  • NZP-CSI-RS-Resourceset NZP-CSI-RS-Resourceset
  • CSI-IM-Resourceset CSI-IM resource set
  • CSI-IM-Resourceset Includes the setting for the group of CSI-SSB resource set
  • NZP-CSI-RS-Resourceset 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).
  • a plurality of NZP-CSI-RS resource sets in the resource setting / CSI reporting configuration 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.
  • 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
  • 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.
  • 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.
  • the first ID and the second ID associated with the resource set may correspond to the first TRP and the second TRP, respectively.
  • 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).
  • 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
  • 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.
  • the ID associated with the NZP-CSI-RS-Resource may correspond to different TRPs based on a fixed rule between the base station and the terminal.
  • 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.
  • 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.
  • 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.
  • FIG 9 illustrates a CSI reporting procedure according to an embodiment of the present disclosure.
  • the base station (eg, TRP#1) may transmit the NZP CSI-RS resource for TRP#1 to the terminal in TRP#1.
  • 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.
  • the base station may transmit an NZP CSI-RS resource to the terminal in TRP#2 to obtain CSI for TRP#2.
  • 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.
  • the UE 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 shows an example of calculating SINR based on the NZP CSI-RS resource of TRP#1 in FIG. 9(a).
  • Equation 7 shows an example of calculating the SINR based on the NZP CSI-RS resource of TRP#1/#2 in FIG. 9(b).
  • 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.
  • the RI/PMI combination eg, information on W 2
  • CQI having the best SINR value
  • 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.
  • 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.
  • '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.
  • port(s) of the CSI-RS resource it may be defined based on a specific column of an effective channel corresponding thereto.
  • 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.
  • the UE may apply the information of CSI#1 when reporting CSI#2 for TRP#2 after reporting CSI#1 for TRP#1.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • FIG. 10 illustrates a signaling procedure between a network and a terminal according to an embodiment of the present disclosure.
  • FIG. 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.
  • 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.
  • a Network may be a single base station including a plurality of TRPs, and may be a single cell including a plurality of TRPs.
  • an ideal (ideal) / non-ideal (non-ideal) backhaul (backhaul) may be set between TRP 1 and TRP 2 constituting the network.
  • backhaul backhaul
  • 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.
  • 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)
  • 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.
  • the TRP may be classified according to information (eg, index, identifier (ID)) about the CORESET group (or CORESET pool).
  • ID identifier
  • the configuration of such a CORESET group may be performed through higher layer signaling (eg, RRC signaling, etc.).
  • the base station may mean a generic term for an object that transmits and receives data with the terminal.
  • 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.
  • the TP and/or TRP may include a panel of a base station, a transmission and reception unit, and the like.
  • the TRP may be classified according to information (eg, index, ID) about the CORESET pool (or CORESET group).
  • TRP may be classified according to CORESETPoolIndex.
  • CORESETPoolIndex 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.).
  • 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.
  • 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.
  • the UE receives a single DCI (that is, when the representative TRP transmits DCI to the UE), signaling is indicated.
  • 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).
  • 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.
  • the configuration information may be delivered through higher layer signaling (eg, RRC signaling, MAC-CE, etc.).
  • the setting information is predefined or set, the corresponding step may be omitted.
  • 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).
  • CORESET-related setting information eg, ControlResourceSet IE
  • 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).
  • 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.
  • CSI reporting configuration e.g, 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.
  • CSI reporting configuration information eg, CSI reporting configuration (CSI-ReportConfig) / CSI resource configuration (CSI-ResourceConfig) / NZP CSI-RS resource set information (NZP
  • a plurality of different NZP CSI-RS resources may be configured in a single report setting/single CSI report setting (eg, CSI-ReportConfig).
  • the plurality of NZP CSI-RS resources may all be resources for channel measurement.
  • some may be resource(s) for channel measurement, and the rest may be resource(s) for interference measurement.
  • 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.
  • the configuration information may include independent/individual configuration information for each of a plurality of CSI-RS resources.
  • 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.
  • the configuration information is a codebook associated with each of the plurality of CSI-RS resources settings (eg, CodebookConfig).
  • 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.
  • 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.
  • 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.
  • a control channel eg, PDCCH, etc.
  • 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.
  • 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).
  • 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'.
  • 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.
  • the CSI-related reference signal may be received based on the configuration information.
  • 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 .
  • the CSI-related procedure for TRP 1 may be performed based on the CSI reported through TRP 2.
  • 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).
  • a CSI-related reference signal eg, CSI-RS
  • the above-described method eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1
  • the above-described 'CSI-related Based on 'operation', the CSI-related reference signal may be received.
  • the CSI-related reference signal may be transmitted periodically/aperiodically/semi-continuously.
  • the CSI-related reference signal may be received based on the configuration information.
  • the UE may receive a CSI-related reference signal (eg, CSI-RS) through/using TRP 2 from the network (S1005).
  • 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.
  • 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).
  • 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).
  • 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.
  • CSI may be measured based on the above-described configuration information and/or DCI and/or CSI-related reference signals.
  • the number of ranks configured for the plurality of CSI-RS resources eg, CSI-RS resource for each TRP
  • the precoding matrix information ie, based on the configuration information
  • the number of ranks ie, the number of transmission layers / ports
  • CSI may be measured differently applied/assumed.
  • 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).
  • the CSI-related reference signal received through / using the TRP 2 may be recognized as interference during CSI measurement for TRP 1.
  • 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).
  • 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 .
  • the CSI-related signal for TRP 2 ie, the second CSI-RS resource
  • a specific codebook may be assumed for CSI calculation.
  • the configuration information may include a codebook configuration for the second CSI-RS resource (ie, a CSI-related signal for TRP 2).
  • 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).
  • 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.
  • 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.
  • the CSI may include RI/PMI/CQI/LI/CRI/RSRP/SINR.
  • port selection (port selection) information for a specific CSI-RS resource may be reported more.
  • the specific CSI-RS resource may correspond to the first CSI-RS resource (ie, a CSI-related signal for TRP 2).
  • 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.
  • the network eg, TRP 1/TRP 2
  • the UE may correspond to the second wireless device, and vice versa may be considered in some cases.
  • 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 .
  • a memory eg, one or more memories (eg, 104 , 204 ) of FIG. 13 .
  • FIG. 11 illustrates an operation of a terminal for transmitting channel state information according to an embodiment of the present disclosure.
  • FIG. 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.
  • the terminal in FIG. 11 is only an example, and may be implemented as the device illustrated in FIG. 13 below.
  • 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.
  • FIG. 11 may be processed by one or more processors 102 and 202 of FIG. 13 .
  • 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 ).
  • instruction/program eg, instruction, executable code
  • the terminal may receive configuration information related to the CSI report from the base station (or network) (S1101).
  • 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.
  • CSI reporting configuration 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.
  • a plurality of different NZP CSI-RS resources may be configured in a single report setting/single CSI report setting (eg, CSI-ReportConfig).
  • the plurality of NZP CSI-RS resources may all be resources for channel measurement.
  • some may be resource(s) for channel measurement, and the rest may be resource(s) for interference measurement.
  • 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.
  • the configuration information may include independent/individual configuration information for each of a plurality of CSI-RS resources.
  • 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.
  • the configuration information is a codebook associated with each of the plurality of CSI-RS resources settings (eg, CodebookConfig).
  • 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.
  • 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.
  • 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 terminal receives a CSI-related signal on a plurality of CSI-RS resources from the base station (or network) (S1102).
  • the above-described method eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1
  • the above-described 'CSI-related operation' Based on the CSI-related reference signal
  • the UE may receive a CSI-related reference signal (eg, CSI-RS) through TRP 1 and/or TRP 2.
  • CSI-related reference signal may be transmitted periodically/aperiodically/semi-continuously.
  • 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.
  • 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).
  • 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.
  • 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.
  • the UE may assume an identity matrix as a precoding matrix for the CSI calculation.
  • 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 configuration information may include a codebook configuration for the second CSI-RS resource.
  • 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.
  • 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.
  • the PMI and/or RI for the first CSI-RS resource in the CSI may not be included.
  • it may include port selection information (eg, a port index) for the first CSI-RS resource in the CSI.
  • FIG. 12 illustrates an operation of a base station for transmitting channel state information according to an embodiment of the present disclosure.
  • FIG. 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.
  • the base station in FIG. 12 is only one example, and may be implemented with the apparatus illustrated in FIG. 13 below.
  • 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.
  • FIG. 12 may be processed by one or more processors 102 and 202 of FIG. 13 .
  • 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 ).
  • instruction/program eg, instruction, executable code
  • the base station may transmit configuration information related to the CSI report to the terminal (S1201).
  • 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.
  • CSI reporting configuration 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.
  • a plurality of different NZP CSI-RS resources may be configured in a single report setting/single CSI report setting (eg, CSI-ReportConfig).
  • the plurality of NZP CSI-RS resources may all be resources for channel measurement.
  • some may be resource(s) for channel measurement, and the rest may be resource(s) for interference measurement.
  • 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.
  • the configuration information may include independent/individual configuration information for each of a plurality of CSI-RS resources.
  • 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.
  • the configuration information is a codebook associated with each of the plurality of CSI-RS resources settings (eg, CodebookConfig).
  • 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.
  • 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.
  • 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 base station (or network) transmits a CSI-related signal to the terminal on a plurality of CSI-RS resources (S1202).
  • the above-described method eg, at least one of embodiments #1-1, #1-2, #1-3, and #1-4 of embodiment #1
  • the above-described 'CSI-related operation' Based on the CSI-related reference signal
  • the UE may receive a CSI-related reference signal (eg, CSI-RS) through TRP 1 and/or TRP 2.
  • CSI-related reference signal may be transmitted periodically/aperiodically/semi-continuously.
  • 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.
  • 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 base station receives the CSI measured/calculated based on the CSI-RS by the terminal from the terminal (S1203).
  • 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.
  • 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.
  • the UE may assume an identity matrix as a precoding matrix for the CSI calculation.
  • 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 configuration information may include a codebook configuration for the second CSI-RS resource.
  • 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.
  • 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.
  • the PMI and/or RI for the first CSI-RS resource in the CSI may not be included.
  • it may include port selection information (eg, a port index) for the first CSI-RS resource in the CSI.
  • FIG. 13 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present disclosure.
  • 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).
  • 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.
  • 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 .
  • 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 .
  • 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
  • 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).
  • 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.
  • RF radio frequency
  • 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.
  • 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 .
  • 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 .
  • 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
  • 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).
  • 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.
  • a wireless device may refer to a communication modem/circuit/chip.
  • one or more protocol layers may be implemented by one or more processors 102 , 202 .
  • 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.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • 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.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • 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.
  • one or more transceivers 106 , 206 may be coupled to one or more processors 102 , 202 and may transmit and receive wireless signals.
  • 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.
  • 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.
  • 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.
  • 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.
  • one or more transceivers 106 , 206 may include (analog) oscillators and/or filters.
  • 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.
  • 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.
  • 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.
  • the wireless communication technology implemented in the wireless devices (XXX, YYY) of the present disclosure may perform communication based on LTE-M technology.
  • 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).
  • eMTC enhanced machine type communication
  • 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.
  • 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention divulgue un procédé et un dispositif d'émission et de réception d'informations d'état de canal dans un système de communication sans fil. Un procédé d'émission d'informations d'état de canal (CSI) selon un mode de réalisation de la présente divulgation peut comprendre les étapes consistant à : recevoir des informations de configuration relatives à un rapport de CSI en provenance d'une station de base ; recevoir un signal de référence d'informations d'état de canal (CSI-RS) sur une pluralité de ressources de CSI-RS à partir de la station de base ; et émettre des CSI calculé sur la base du CSI-RS à la station de base. La pluralité de ressources CSI-RS pour la mesure de canal peuvent être configurées par les informations de configuration relatives au rapport CSI, et sur la base des informations de configuration relatives au rapport CSI, les CSI peuvent être calculées sur la base d'informations de matrice de précodage et/ou du nombre de rangs individuels configurés pour chacune de la pluralité des ressources CSI-RS.
PCT/KR2021/010338 2020-08-06 2021-08-05 Procédé et dispositif d'émission et de réception d'informations d'état de canal dans un système de communication sans fil WO2022031077A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024065275A1 (fr) * 2022-09-28 2024-04-04 Lenovo (Beijing) Limited Procédés et appareils de rapport de csi

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US20190335475A1 (en) * 2017-01-06 2019-10-31 Huawei Technologies Co., Ltd Channel state information processing method and apparatus, and system
WO2020056708A1 (fr) * 2018-09-21 2020-03-26 Qualcomm Incorporated Configuration de rapport de csi pour une transmission multi-trp
WO2020087451A1 (fr) * 2018-11-01 2020-05-07 Lenovo (Beijing) Limited Calcul d'informations d'état de canal
WO2020092468A1 (fr) * 2018-11-02 2020-05-07 Intel Corporation Mesure de csi et définition de qualité de rapport pour 5g nr-trp
WO2020144602A1 (fr) * 2019-01-11 2020-07-16 Telefonaktiebolaget Lm Ericsson (Publ) Rétroaction d'informations d'état de canal (csi) à faible surdébit concernant une transmission multi-point de transmission (trp)

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Publication number Priority date Publication date Assignee Title
US20190335475A1 (en) * 2017-01-06 2019-10-31 Huawei Technologies Co., Ltd Channel state information processing method and apparatus, and system
WO2020056708A1 (fr) * 2018-09-21 2020-03-26 Qualcomm Incorporated Configuration de rapport de csi pour une transmission multi-trp
WO2020087451A1 (fr) * 2018-11-01 2020-05-07 Lenovo (Beijing) Limited Calcul d'informations d'état de canal
WO2020092468A1 (fr) * 2018-11-02 2020-05-07 Intel Corporation Mesure de csi et définition de qualité de rapport pour 5g nr-trp
WO2020144602A1 (fr) * 2019-01-11 2020-07-16 Telefonaktiebolaget Lm Ericsson (Publ) Rétroaction d'informations d'état de canal (csi) à faible surdébit concernant une transmission multi-point de transmission (trp)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024065275A1 (fr) * 2022-09-28 2024-04-04 Lenovo (Beijing) Limited Procédés et appareils de rapport de csi

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