WO2019208992A1 - Procédé d'émission ou de réception d'informations d'état de canal dans un système de communication sans fil et dispositif associé - Google Patents

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

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Publication number
WO2019208992A1
WO2019208992A1 PCT/KR2019/004836 KR2019004836W WO2019208992A1 WO 2019208992 A1 WO2019208992 A1 WO 2019208992A1 KR 2019004836 W KR2019004836 W KR 2019004836W WO 2019208992 A1 WO2019208992 A1 WO 2019208992A1
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WIPO (PCT)
Prior art keywords
information
csi
base station
terminal
matrix
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PCT/KR2019/004836
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English (en)
Korean (ko)
Inventor
정재훈
강지원
박해욱
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엘지전자 주식회사
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Publication of WO2019208992A1 publication Critical patent/WO2019208992A1/fr

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Classifications

    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for transmitting and receiving channel state information and a device for supporting the same.
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • the mobile communication system has expanded not only voice but also data service, and the explosive increase in traffic causes shortage of resources and users require faster services. Therefore, a more advanced mobile communication system is required. .
  • MIMO Massive Multiple Input Multiple Output
  • NOMA Non-Orthogonal Multiple Access
  • Ultra-Wideband Various technologies such as Super wideband support / Device Networking are being studied.
  • the present specification proposes a method of reducing overhead of channel state information reporting (ie, feedback) in a wireless communication system.
  • the present disclosure relates to a method for reporting channel state information including information on linear combination (LC) codebooks that are efficient in terms of elaborate yet feedback overhead, based on the angular properties of the channels. Suggest.
  • LC linear combination
  • a method for a terminal to perform channel state information reporting in a wireless communication system wherein the method is related to the CSI for a downlink channel from a base station .
  • Receiving configuration information Receiving, from the base station, a CSI-RS for the CSI report; Calculating angular informat ion of the downlink channel based on at least one of the configuration information and / or the CSI-RS; And performing the CSI report to the base station by using the configuration information and the angle information.
  • the CSI report may include information on a linear combination (L codebook) based on the angle information.
  • the setting information may include transformation matrix information for calculating the angle information, estimation of a spatial rotation matrix, and a beam of the base station.
  • information and / or load the entire page for the CSI reported size (total payload size) may include at least information of the Hi-me.
  • the information on the beam of the base station i) the oversampling factor and / or ii) the number of combined groups and the indicator of the corresponding beam ( index).
  • the angle information may include i) a signal direction, an angular spread, iii) a spatial rotation parameter, and / or iv
  • the conversion matrix may include at least one of the number of beams and an index of a corresponding category.
  • the method may further include reporting the angle information to the base station, wherein the angle information may be periodic, aperiodic or semi-persistent. ) Can be set to be reported.
  • the method may further include receiving spatial rotation parameter setting information from the base station.
  • the spatial rotation parameter setting information may be set by the base station based on the angle information.
  • the method may further include performing, by the base station, CSI reporting based on the spatial rotation parameter setting information.
  • the information about the LC codebook includes information related to a precoding matrix including a first matrix and a second matrix, wherein the first matrix is a wideband ( wideband) channel attribute, and the second matrix may correspond to a subband channel attribute.
  • the first matrix is set based on a spatial rotation matrix shared between the terminal and the base station, and the spatial rotation matrix is defined as the first matrix. It can be set based on the spatial rotation parameter.
  • the method for the terminal to calculate the first spatial rotation parameter comprising the steps of: setting a second spatial rotation parameter; Plotting a channel covariance matrix based on the second spatial rotation parameter; And calculating the first spatial rotation parameter based on the channel covariance matrix, wherein the first spatial rotation parameter is regarded as a valid value when the coefficient of the channel covariance matrix is greater than or equal to a specific threshold value and the number of valid coefficients.
  • the first spatial rotation parameter can be calculated based on the value where is the smallest.
  • the first matrix is DFT beam index information is included as a component, and the DFT beam index may be set based on the order influencing the CSI reporting based on the angle information.
  • the second matrix includes a coupling coefficient 3 ⁇ 4 ⁇ for the LC codebook, wherein the coupling coefficient is set based on the spatial rotation matrix.
  • the terminal is functional with an RF unit and a RF unit for transmitting and receiving a radio signal.
  • a processor coupled to the processor, the processor configured to: receive configuration information related to the CSI for a downlink channel from a base station; Receive, from the base station, a CSI-RS for the CSI report; Calculating angular information of the downlink channel based on at least one of the configuration information and / or the CSI-RS; And controlling to perform the CSI report to the base station by using the configuration information and the angle information.
  • the CSI report may include information on a linear combination (LC) codebook based on the angle information.
  • the processor may control the angle information to be reported to the base station periodically, aperiodic, or semi-persistent. have. 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • a base station in which a terminal performs channel state information reporting in a wireless communication system wherein the base station includes a radio frequency (RF) unit and the RF unit for transmitting and receiving a radio signal.
  • RF radio frequency
  • a processor functionally connected with the processor, wherein the processor is configured to transmit configuration information related to the CSI for a downlink channel to a terminal; Send a CSI-RS for the CSI report to the terminal; And control to receive the CSI report from the terminal, wherein at least one of the configuration information and / or the CSI-RS is used by the terminal to calculate angular information of the downlink channel;
  • the CSI report may include information on a linear combination (LC) codebook calculated based on the configuration information and the angle information.
  • LC linear combination
  • the angular property of uplink and / or downlink is utilized, that is, based on a signaling path and angular spread information between a terminal and a base station.
  • there is an effect of increasing the accuracy of the beam by selectively configuring the columns of a specific DFT.
  • Figure 1 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.
  • FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification may be applied.
  • FIG 3 shows an example of a frame structure in an NR system.
  • FIG. 4 shows an example of a resource grid supported in a wireless communication system to which the method proposed in this specification can be applied.
  • FIG. 5 shows antenna ports and neuralologies to which the method proposed in this specification can be applied. Examples of resource grids are shown.
  • FIG. 6 shows an example of a self-contained structure to which the method proposed in this specification can be applied.
  • 7 shows an example of a signal transmission and reception method.
  • FIG 8 shows an example of a signaling procedure between a terminal and a base station related to channel state information (CSI) reporting.
  • CSI channel state information
  • FIG. 9 illustrates a two-dimensional active antenna system having 64 antenna elements in a wireless communication system to which the present invention can be applied.
  • FIG. 1 ⁇ illustrates a system in which a base station or a terminal has a plurality of transmit and / or receive antennas capable of forming 3D (3-Dimension) beams based on AAS in a wireless communication system to which the present invention can be applied.
  • FIG. 11 illustrates a two-dimensional antenna system having cross polarization in a wireless communication system to which the present invention can be applied.
  • FIG. 12 illustrates a transceiver unit model in a wireless communication system to which the present invention can be applied.
  • FIG 13 shows an example of a multi-panel antenna array to which the present invention can be applied.
  • FIG. 14 is a diagram illustrating an example of a massive MIMO base station in a finite scattering environment.
  • FIG. 16 illustrates an example of channel sparsity effects to which spatial rotation and DFT operations are applied to which an embodiment proposed in the present specification may be applied.
  • FIG. 17 shows an example of a signaling procedure between a base station and a terminal for CSI reporting to which an embodiment proposed in the present specification can be applied.
  • FIG. 18) shows another example of a signaling procedure between a base station and a terminal for reporting 031 to which an embodiment proposed in the present specification can be applied.
  • FIG. 19 shows an example of an operation flowchart of a terminal performing a 031 report in a wireless communication system to which the method proposed in this specification can be applied.
  • FIG. 20 illustrates an example of an operation flowchart of a terminal performing a 0 £ 1 report in a wireless communication system to which the method proposed in this specification can be applied.
  • FIG. 21 is a wireless communication system to which the method proposed in the present specification can be applied.
  • An example of the operation flowchart of the base station which receives a report is shown.
  • FIG. 22 illustrates a block diagram of a wireless communication apparatus to which the methods proposed herein may be applied.
  • 23 is another example of a block diagram of a wireless communication device to which the methods proposed herein may be applied.
  • 24 is another example of a block diagram of a wireless communication device to which the methods proposed herein may be applied.
  • FIG. 25 is another example of a block diagram of a wireless communication device to which the methods proposed herein may be applied.
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • the base station may be represented by the first communication device and the terminal by the second communication device.
  • a base station (BS) is a fixed station, a Node B, an evolved-NodeB (eNB), a Next Generation NodeB (gNB), a base transceiver system (BTS), an access point (AP), a network (5G). Network), AI system, RSU (road side unit), vehicle, robot / (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) 3 ⁇ 4 ⁇ 1 ,
  • a terminal may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber staton (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber staton
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • Machine-Type Machine-Type
  • M2M Machine-to-Machine
  • D2D Device— to-Device
  • vehicles vehicles
  • robots AI modules
  • drones Unmanned 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • Aerial Vehicle UAV
  • Augmented Reality AR
  • VR Virtual
  • CDMA can be implemented with wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2.
  • UTRA Universal Terrestrial Radio Access
  • TDMA supports GSM (Global System for Mobile communications) / GPRS (General
  • OFDMA Wireless technology such as Evolution.
  • OFDMA is IEEE 802.11
  • Wi-Fi Wi-Fi
  • WiMAX WiMAX
  • IEEE 802-20 Wi-Fi
  • E-UTRA Evolved UTRA
  • UTRA is UMTS (Universal Mobile)
  • LTE Long Term Evolution
  • E-UMTS Evolved UMTS
  • LTE-A Advanced
  • LTE-A pro LTE-A pro
  • 3GPP NR New Radio or New Radio Access Technology
  • LTE refers to technology after 3GPP TS 36.
  • xxx Release 8 In detail, LTE technology after 3GPP TS 36.
  • xxx Release 10 is referred to as LTE-A, and LTE technology of 3GPP TS 36.
  • xxx Release 13 0 1 ⁇ ⁇ is LTE-A pro.
  • 3GPP 3rd Generation Partnership Project
  • ⁇ means technology after TS 38.
  • LTE / NR may be referred to as a 3GPP system.
  • Xxx means standard document detail number. 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • LTE / NR may be collectively referred to as 3GPP system.
  • Background, terminology, abbreviations and the like used in the description of the present invention may refer to the matters described in the standard documents published prior to the present invention. For example, see the following document:
  • RRC Radio Resource Control
  • NR 5G radio access technology
  • the new RAT system including the NR uses an OFDM transmission scheme or a similar transmission scheme.
  • the new RAT system may follow OFDM parameters different from the OTOM parameters of LTE, or the new RAT system follows the existing LTE / LTE- A's numerology, but with a larger system bandwidth (e.g., 100 MHz). I can have it.
  • one cell may support a plurality of neurology. That is, terminals operating with different neurology may coexist in one cell.
  • Numerology corresponds to one subcarrier spacing in the frequency domain. By scaling the reference subcarrier spacing to an integer N, different numerology can be defined.
  • New RAN A radio access network that supports NR or E-UTRA or interacts with NGC.
  • Network slice A network slice defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements with end-to-end coverage.
  • the network function is a logical NG-C within a network infrastructure with a well-defined external interface and well-defined functional behavior.
  • NG-U User plane interface used for the NG3 reference point between the new RAN and NGC.
  • Non-standalone NR A deployment configuration where a gNB requires an LTE eNB as an anchor for control plane connection to EPC or an eLTE eNB as an anchor for control plane connection to NGC.
  • Non-Standalone E-UTRA Deployment configuration requiring gNB as anchor for control plane connection with eLTE eNB7> NGC.
  • User plane gateway The endpoint of the NG-U interface. System general
  • NG-RAN is defined as gNBs that provide control plane yoy protocol termination for NG-RA user plane (new. AS sublayer / PDCP / RLC / MAC / PHY) and UE (User Equation). It is composed.
  • the gNBs are interconnected via an X n interface.
  • the gNB is also connected to the NGC via the NG interface. More specifically, the gNB can access and control AMF (NMF) through an N2 interface.
  • NMF AMF
  • UPF User Plane Function
  • OFDM orthogonal frequency
  • a number of 0 0 numerologies can be defined as shown in Table 1.
  • FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification may be applied.
  • One slot is located; ⁇ 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • a mb is determined according to the used numerology and slot configuration.
  • Table 2 shows slots in normal (normal ⁇ CP : OFDM symbol; Radio frame »rsubframe // Shows the number of slots per frame ( slQt ) and the number of slots per subframe ( slQt ).
  • Table 3 shows the number of OFDM symbols per slot in extended ⁇ CP and the number of slots per radio frame. , The number of slots per subframe.
  • 3 shows an example of a frame structure in an NR system. 3 is merely for convenience of description and does not limit the scope of the invention.
  • mini-slot may consist of two, four or seven symbols, and may consist of more or fewer symbols.
  • antenna ports With regard to physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. May be considered.
  • the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel carrying a symbol on one antenna port can be deduced from the channel carrying the symbol on another antenna port, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the broad characteristics include delay spread, Doppler spread, frequency shift f average received power, change 3 ⁇ 4 (Received Timing) It includes the above.
  • FIG. 4 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied. 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • the resource grid is in the frequency domain
  • one subframe includes 14 _2 OFDM symbols, but is not limited thereto.
  • the transmitted signal is One or more resource grids composed of subcarriers
  • Mr. £. Above Represents the maximum transmission bandwidth, which may vary between uplink and downlink as well as the numerologies.
  • one resource grid may be set for each pneumatics // and antenna port p.
  • FIG. 5 shows examples of an antenna port and a number of resource grids based on each numerology to which the method proposed in this specification can be applied.
  • Each element of the resource grid for the numeric jU and the antenna port is referred to as a resource element and is an index pair Uniquely identified by From here, Is the index on the frequency domain,
  • an index pair (hour) is used.
  • / 0, ... ⁇ ; mb -l.
  • the resource factor for the numerology f and antenna port corresponds to the complex value a ⁇ . If there is no risk of confusion, or if a particular antenna port or numerology is not specified, the indices P and // can be dropped so that the complex value is a k ⁇ f or a k ] o be) 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • Point A serves as a common reference point of the resource block grid and can be obtained as follows.
  • OffsetToPointA for the PCell downlink represents the frequency offset between the lowest subcarrier of the lowest resource block and point A overlapping with the SS / PBCH block used by for the initial cell selection, 15 kHz subcarrier spacing for FR1 and FR2 Expressed in resource block units assuming a 60kHz subcarrier spacing for;
  • absoluteFrequencyPointAO represents the frequency-location of point A expressed as in absolute radio-frequency channel number (ARFCN)
  • Common resource blocks are numbered upwards from ⁇ in the frequency domain for subcarrier spacing 1 .
  • the center of the subcarrier ⁇ of the common resource block ⁇ for the subcarrier spacing coincides with 'point A'.
  • the resource element (k, l) for setting the common resource block number R B and the subcarrier spacing in the frequency domain may be given by Equation 1 below.
  • Physical resource blocks are zero-based within the bandwidth part (BWP). Numbered up to 7 , the number of BWPs.
  • the relationship between the physical resource block bird and the common resource block ⁇ CRB in BWP i may be given by Equation 2 below.
  • CRB PRB + BWP, where may be a common resource block in which the BWP starts relative to common resource block 0.
  • the TDD (Time Division Duplexing) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one slot (or subframe). This is to minimize the latency of data transmission in the TDD system, and the structure may be designated as a self-contained structure or a self-contained slot.
  • 6 shows an example of a self-contained structure to which the method proposed in this specification can be applied. 6 is merely for convenience of description and does not limit the scope of the present invention.
  • a case for example, slots, a sub-frame
  • 14 OFDM Orthogonal Frequency Division Multiplexing
  • region 602 means a downlink control region
  • region 604 means an uplink control region.
  • regions other than regions 602 and 604 may be used for transmission of downlink data or uplink data.
  • uplink control information and downlink control information may be transmitted in one self-contained slot.
  • uplink data or downlink data may be transmitted in one self-contained slot.
  • downlink transmission and uplink transmission are sequentially performed in one self-contained slot, and transmission of downlink data and reception of uplink ACK / NACK may be performed.
  • a process of the base station (eNodeB, eNB, gNB) and / or terminal (UE, User Equipment) switching from a transmission mode to a reception mode Alternatively, a time gap for switching from a reception mode to a transmission mode is required.
  • some OFDM symbol (s) may be set to a guard period (GP). 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • FIG. 7 is a diagram illustrating an example of a signal transmission and reception method.
  • the UE when the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S701). To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and acquires information such as a cell ID. Can be. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the UE may check a downlink channel state by receiving a downlink reference signal (DL) in an initial cell search step.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
  • the UE may check a downlink channel state by receiving a downlink reference signal (DL) in
  • the terminal may perform a random access procedure (RACH) for the base station (steps S703 to S706).
  • RACH Random Access Channel
  • PRACH ⁇ Physical Random Access Channel
  • a response message for the preamble can be received through 24 (S704 and S706).
  • a Stock Resolution Procedure may be performed.
  • the UE After performing the above-described procedure, the UE performs a PDCCH / PDSCH reception (S707) and a physical uplink shared channel (PUSCH) / physical uplink control as a general uplink / downlink signal transmission procedure.
  • a PDCCH / PDSCH reception S707
  • a physical uplink shared channel PUSCH
  • physical uplink control as a general uplink / downlink signal transmission procedure.
  • PUCCH Physical Uplink Control Channel
  • S708 Physical Uplink Control Channel
  • the UE controls downlink control information through the PDCCH.
  • Control Information includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
  • the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI). ), And the like.
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI).
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • Table 4 shows an example of the DCI format in the NR system.
  • DCI format 0JD is used for scheduling of PUSCH in one cell.
  • DCI format 0_0 is transmitted by being CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.
  • DCI format 0_1 is used to reserve a PUSCH in one cell.
  • Information contained in DCI format 0_1 may be obtained by C-RNTI or: CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI.
  • DCI format 1_0 is used for scheduling of PDSCH in one DL cell. Information included in DCI format 1_0 is transmitted by being CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI. DCI format 1_1 is in one cell . Used for scheduling of PDSCH. Information included in DCI format 1_1 is transmitted by being CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI. DCI format 2 1 is used to inform the PRB (s) and OFDM symbol (s) that the terminal may assume no transmission.
  • DCI format 2_1 The following information included in DCI format 2_1 is CRC scrambled by INT-RNTI and transmitted.
  • channel state information-reference signal (CSI-RS) can be used for time and / or frequency tracking, CSI computation, LI (layer 1) -RSRP (reference). 2019/208992 1 1/10 ⁇ 019/004836
  • CSI computation is related to CSI acquisition and L1-RSRP computation is related to beam management (BM).
  • BM beam management
  • Channel state information refers to information that may indicate the quality of a wireless channel (or also referred to as a link) formed between a terminal and an antenna port.
  • FIG. 8 is a flowchart illustrating a complete process of a CSI related procedure.
  • the terminal (such as: user equipment, UE) is the set (configuration) information related to the CSI (radio resource control) RRC 7 1 flag state through the signal ⁇ ng (e.g. : general Node B (gNB)) (S810).
  • gNB general Node B
  • the CSI-related configuration information may include information related to CSI-IM (interference management) resources, information related to CSI measurement configuration, information related to CSI resource configuration, and information related to CSI-RS resource. Or CSI report configuration related information.
  • CSI-IM interference management
  • CSI-IM resource related information includes CSI-IM resource information, CSI-IM support set 3 ⁇ 4 iL (resource set information) It may include.
  • CSI-IM resource set is CSI-IM resource set
  • one resource set includes at least one CSI-IM resource.
  • Each CSI-IM resource is a CSI-IM 2019/208992 1 HE1 / 10 ⁇ 019/004836
  • CSI resource configuration related information is CSI-
  • the CSI resource configuration related information defines a group including at least one of a NZP (non zero power) CSI-RS resource set r CSI IM resource set or 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 includes at least one of an NZP CSI-RS resource set list, a CSI-IM resource set list, or a CSI-SSB resource set list. It may include one.
  • the CSI-RS resource set is identified by a CSI-RS resource set ID, and one resource set shoots at least one CSI-RS resource-each CSI-RS resource is identified by a CSI-RS resource ID
  • S / NZP CSI-RS resource for each parameter set represents the use of a CSI-RS as shown in Table 5 (Examples: BM-related 'repetition' parameter, tracking relevant 'trs-Info' parameter) may be set °].
  • Table 5 shows an example of the NZP CSI-RS resource set IE.
  • SI ⁇ is CSI-RS-ResourceRep of 1 ⁇ 1 parameter Corresponds.
  • CSI report configuration related information includes a report configuration type parameter indicating a time domain behavior and a reportQuantity parameter indicating a CSI related quantity to be reported.
  • CSI report configuration related information may be expressed as CSI-ReportConfig IE, and Table 6 below shows an example of CSI-ReportConfig IE.
  • the terminal measures the CSI based on the configuration information related to the CSI (S820).
  • the measurement of the CSI may be expressed by the calculation of the CSI, the calculation of the CSI.
  • the CSI measurement may include (1) a CSI-RS reception process (S821) of the UE, and (2) a process (S826) of calculating the CSI through the received CSI-RS, which will be described in detail. Will be described later.
  • the CSI-RS is configured to map resource elements (REs) of CSI-RS resources in a time and frequency domain by higher layer parameter CSI-RS-ResourceMapping.
  • REs resource elements
  • Table 7 shows an example of the CSI-RS-ResourceMapping IE.
  • the density represents the density of the CSI-RS resource that jeukjeong in RE / port / PRB (physical resource block) / Shows the number of antenna ports. 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • the terminal reports the measured CSI to a base station (S830).
  • the CSI report may be represented by CSI feedback.
  • the terminal may omit the report.
  • the terminal may report to the base station.
  • the report of the terminal can be omitted only when the repetition is set to 'ON'.
  • a MIMO system with multiple antennas can be referred to as a Massive MIMO system, and is attracting attention as a means to improve spectral efficiency, energy efficiency, and processing complexity. .
  • Massey ⁇ MIMO ⁇ - Full-Dimension MIMO (FD-MIMO) SS is referred to.
  • AAS active antenna system
  • AAS supports an electronic beam control scheme for each antenna, thereby enabling advanced MIMO technologies such as forming a precise beam pattern or a three-dimensional beam pattern in consideration of beam direction and width.
  • a three-dimensional beam pattern can be formed by the active antenna of the yaw.
  • FIG. 9 illustrates a two-dimensional active antenna system having 64 antenna elements in a wireless communication system to which the present invention can be applied.
  • a typical two-dimensional (2D) antenna array is illustrated.
  • h is the number of antenna columns in the horizontal direction Indicates the number of antenna rows in the direction.
  • the radio wave can be controlled both in the vertical direction (elevation) and in the horizontal direction (azimuth) to control the transmission beam in three-dimensional space.
  • This type of wavelength The control mechanism may be referred to as three-dimensional beamforming. 10 illustrates a system in which a base station or a terminal has a plurality of transmit / receive antennas capable of forming 3D (3-Dimension) beams based on AAS in a wireless communication system to which the present invention can be applied.
  • FIG. 10 is a diagram illustrating the above-described example, and includes a two-dimensional antenna array (that is,
  • the base station when the receiving beam is formed using a large receiving antenna, a signal power increase effect according to the antenna array gain can be expected. Therefore, in the uplink, the base station can receive a signal transmitted from the terminal through a plurality of antennas, the terminal can set its transmission power very low in consideration of the gain of the large receiving antenna to reduce the interference effect. There is an advantage.
  • FIG. 11 illustrates a two-dimensional antenna system having cross polarization in a wireless communication system to which the present invention can be applied.
  • systems based on active antennas are characterized by weighting the active elements (e.g., amplifiers) attached (or included) to each antenna element.
  • active elements e.g., amplifiers
  • the antenna system can be modeled at the antenna element level.
  • An antenna array model as shown in the example of FIG. 11 may be represented as (M, N, Mi, which corresponds to a parameter characterizing the antenna array structure.
  • M is the number of antenna elements (ie in each column) that have the same polarization in each column (ie in the vertical direction).
  • N represents the number of columns in the horizontal direction (ie, the number of antenna elements in the horizontal direction).
  • the antenna port may be mapped to a physical antenna element.
  • the antenna port ⁇ may be defined by a reference signal associated with the antenna port.
  • the antenna port ⁇ is associated with a cell-specific reference signal (CRS)
  • the antenna port 6 is a PRS ( Positioning Reference Signal)
  • there may be a one-to-one mapping between an antenna port and a physical antenna element, where a single cross polarization antenna element is a downlink MIM0 or This may be the case when used for downlink transmission diversity.
  • antenna port 0 may be mapped to one physical antenna element, while antenna port 1 may be mapped to another physical antenna element. In this case, two downlink transmissions exist from the terminal point of view. One is associated with a reference signal for antenna port 0 and the other is associated with a reference signal for antenna port 1.
  • a single antenna port can be mapped to multiple physical antenna elements. This may be the case when used for beamforming. Beamforming can direct downlink transmissions to specific terminals by using multiple physical antenna elements. In general, this can be achieved by using an antenna array consisting of multiple columns of multiple cross polarization antenna elements. In this case, at the terminal, there is a single downlink transmission generated from a single antenna port. One relates to the CRS for antenna port 0 and the other relates to the CRS for antenna port 1.
  • the antenna port represents the downlink transmission and the downlink transmission at the terminal, not the actual downlink transmission transmitted from the physical antenna element at the base station.
  • multiple antenna ports are used for downlink transmission, but each antenna port may be mapped to multiple physical antenna elements.
  • the antenna array may be used for downlink MIMO or downlink diversity.
  • antenna ports 0 and 1 may each map to multiple physical antenna elements.
  • MIMO precoding of data streams may go through antenna port virtualization, transceiver unit (or transceiver unit) (TXRU) virtualization, and antenna element pattern.
  • TXRU transceiver unit
  • Antenna port virtualization allows the stream on the antenna port to be precoded on the TXRU.
  • TXRU virtualization allows the TXRU signal to be precoded on the antenna element.
  • the antenna element pattern may have a directional gain pattern of the signal radiated from the antenna element.
  • an antenna port is defined with a reference signal (or pilot).
  • DMRS is transmitted in the same bandwidth as the data signal, and DMRS ⁇ -data are all precoded with the same precoder (or the same TXRU virtualized precoding).
  • the CSI-RS is transmitted through multiple antenna ports.
  • the precoder characterizing the mapping between the CSI-RS port and the TXRU may be designed with a unique matrix so that the UE may estimate the TXRU virtualization precoding matrix for the data precoding vector.
  • FIG. 12 illustrates a transceiver unit model in a wireless communication system to which the present invention can be applied.
  • M_TXRU TXRUs consist of a single column antenna array with the same polarization.
  • the TXRU model configuration corresponding to the antenna array model configuration (M, N, P) of FIG. 11 may be represented as (M_TXRU, N, M.
  • M_TXRU is a 2D-like column
  • the same polarization (polar TXzation) means the number of TXRUs, and always satisfies M_TXRU ⁇ M. That is, the total number of TXRUs is
  • TXRU virtualization model is based on the correlation between the antenna element and the TXRU, as shown in FIG. 12 (a).
  • TXRU virtualization model option-1 sub-array partition model
  • FIG. Model Option-2 Can be distinguished by a full-connection model.
  • antenna elements are divided into multiple antenna element groups, and each
  • TXRU is associated with one of the groups.
  • signals of multiple TXRUs are combined and delivered to a single antenna element (or an array of antenna elements).
  • w is: the wideband TXRU virtualization weight vector, and? is the wideband TXRU virtualization weight matrix.
  • x is the signal vector of M_TXRU TXRUs.
  • mapping between the antenna port and the TXRUs may be one-to-one or one-to-many.
  • TXRU-to-element mapping in FIG. 12 shows only one example, and the present invention is not limited thereto, and TXRU and antenna elements may be implemented in various forms from a hardware point of view. The present invention can be equally applied to the mapping between them.
  • FIG. 13 shows a generalized multi panel antenna array, consisting of Mg and Ng panels in the horizontal and vertical domains, respectively, with one single panel each being M.
  • FIG. It consists of N columns and N rows.
  • a 2-pole antenna is assumed. Accordingly, the total number of antenna elements is 2 * M * N * Mg * Ng.
  • a multi-panel antenna array is supported in a new radio access technology (RAT) environment.
  • RAT radio access technology
  • Equation 3 Represents the index of the one-dimensional DFT (1D-DFT) codebook of the 2 ⁇ domain.
  • N1 denote the number of antenna ports per pol of I st and 2 nd dimensions in a single panel.
  • ol and o2 represent the oversampling factor ⁇ in the I st and 2 nd dimensions (dimens ⁇ on) in the panel.
  • the resolution of the Discrete Fourier Transform (DFT) for each domain in the panel can be improved; .
  • DFT Discrete Fourier Transform
  • channel information may be converted into sub-channels configured at uniform intervals in the entire horizontal and / or vertical beam-space through a DFT operation.
  • points (or points) having a value other than ⁇ may be interpreted as an angular spread around a specific direction of arrival (DOA) of a channel.
  • DOA direction of arrival
  • the number of sub-channels having a significant value is limited and dense sparse shape. see.
  • the number of antennas at the transmitting end is finite and this limits the resolution of the DFT.
  • the power for each sub-channel is lost to the adjacent sub-channels, so that the number of non-zero sub-channel powers increases as compared with when the resolution of the DFT is high. have.
  • the direction of the incoming signal with the sub-channels with higher accuracy to reduce the power loss of the sub-channels The method can be considered. Through the above method, the number of combined beams may be reduced.
  • the coupling coefficient (s) (combining coefficient (s)) ° 1 can be represented simply, the terminal may report a higher accuracy of the channel state information.
  • angular reciprocity may mean that the path or angle of the uplink (UL) signal and the angular spread are the same in the downlink (DL). This may be achieved even in an FDD environment in which a difference in carrier frequencies between UL and DL is about several GHz.
  • the angular property of can be calculated through the angular information # obtained through the UL signal, and by using this, the number of instantaneous channel gains to be fed back by the terminal can be greatly reduced.
  • the characteristics of the UL channel may be the same as FIG. 15.
  • an azimuth angle of departure (AoD) of a base station is provided.
  • a range of the corresponding support area may be estimated based on
  • the terminal and / or the base station obtains the channel information in downlink (DL) by using a low-rank characteristic of channel information based on sparsity of a massive MIMO radio channel environment. It may be possible to significantly reduce the head.
  • DL downlink
  • the (p, q) th element may be configured as follows.
  • ranging value represents a number of antenna ports (e.g., base station) is, That is, the resolution of the DFT can be greatly improved due to the massive antenna configuration of the transmitter (eg, N T »1), and the angle and angular spread of the signal can be determined with relatively high accuracy through the DFT operation. It may be possible to.
  • the DFT operation converts channel information into sub-channels that are organized at uniform intervals in the entire beam-space.
  • points (or points) having a non-zero value may be interpreted as angular spread around a specific DoA (direction of arrival) of the channel.
  • DoA direction of arrival
  • the number of antennas of the transmitting end is finite and this may limit the resolution of the DFT.
  • the power of each sub-channel leads to an outflow to adjacent sub-channels, so that the number of sub-channels whose power is not ⁇ may increase compared to when the resolution of the DFT is high. . This may weaken the sparsity of the channel and may cause a burden on the feedback to the channel.
  • a method of reducing the power leakage of the subchannels by performing spatial rotation of the radio channel with a higher accuracy of alignment of the subchannels and the incoming signal is considered.
  • the sparsity effect of the channel through spatial rotation and DFT operation may be as shown in FIG. 16.
  • 16 is a spatial rotation and can be applied to the embodiments proposed herein 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • channel sparsity effects to which a DFT operation is applied is shown. 16 is merely for convenience of description and does not limit the scope of the present invention.
  • channel information is represented by 28 subchannels, whereas subchannels may be represented by 11 when spatial rotation is performed principally.
  • linear combination (LC) codebook LC codebook
  • covariance matrix feedback for accurate channel state information (CSI) reporting while efficiently reducing feedback overhead.
  • High resolution reporting (i.e., feedback) methods are considered.
  • W1 consists of a set of L orthogonal beams of the 2D DFT beams.
  • the set of L beams is selected from oversampled 2D DFT beams and L can be set from L e ⁇ 2 f 3, 4, 6 ⁇ -and the beam selection is wideband Is done in For W2, the L beams selected at W1 are combined with W2.
  • subband reporting on phase quantization of the beam's combining coefficients is based on QPSK and 8-PSK with respect to the phase quantization information.
  • Feedback in the channel covariance matrix corresponds to long-term and wideband.
  • the quantized and / or compressed versions of the covariance matrix are reported to the UE.
  • the quantization and / or compression is based on a set of M orthogonal basis vectors. It may also be reported including an indicator for the M basis vectors, along with the set of coefficients.
  • the following schemes can be considered to reduce feedback overhead of Type II CSI.
  • compression based on DFT may be considered.
  • the precoder for a layer is a matrix of size PxN 3 Can be represented. here ,
  • Compression in the spatial domain (SD) is selected from the basis vectors of L spatial domains (2L total polarization), and the basis vectors use the following equation (5). Can be done in a compressed manner.
  • the input axis in the frequency domain (FD) may be represented by Equation 6 below.
  • Orthogonal DFT vectors of yv 3 xl of magnitude for component i 0, ..., 2L-1. ⁇ Mi ⁇ corresponding to the number of components in the frequency domain, or Can be set.
  • the beam in the case of implicit LC codebook feedback, it is also contemplated to combine (by size and / or phase) the beam into the gastric subband to maximize its performance.
  • the magnitude of the total feedback reported is the number of combined beams and the combining coefficient.
  • the quantized amount increases linearly with the size capability of the subband, which places a large burden on the feedback overhead.
  • the CSI reporting over the combined beam information in the wideband and / or the channel property in the subband is utilized by utilizing the angular property of the radio channel between the base station and the terminal.
  • techniques for acquiring angular information based on uplink and / or downlink reference signals i.e.
  • the present disclosure proposes a technique and a signaling procedure for achieving the above object by using information related to channel sparsity characteristics occurring in an ultrahigh-frequency massive MIMO wireless communication environment.
  • the terminal may receive configuration information related to CSI from the base station, and then the terminal may receive a reference signal (eg, CSI-RS) from the base station.
  • Angle information may be calculated using at least one of the information and / or the CSI-RS, and channel state information may be calculated based on the calculated angle information and the CSI-RS.
  • the calculated CSI can be reported to the base station.
  • the channel state information (CSI) is described based on a linear combination codebook, but it is a matter of course that other channel state information (CSI) types can be extended.
  • the terminal in order to measure and / or calculate the CSI, the terminal receives a specific reference signal (RS) (for example, CSI-RS, etc.) configured for the CSI measurement and / or calculation from the base station.
  • RS reference signal
  • the case is assumed.
  • the UE may measure (and / or calculate) CSI using a specific RS received by the UE, and may be configured to report the CSI to the base station (in a feedback format).
  • a method for reporting a part or all of angular information of a radio channel to a base station by using a reference signal (RS) (for example, CSI-RS) received from a base station see.
  • RS reference signal
  • the angle information reported by the terminal to the base station may include the following content.
  • the number of beams in the transformation matrix (e.g. DFT matrix, pre-def ined basis) and the index of the beam
  • the angle information may be configured to be reported periodically (periodic), aperiodic (aperiodic), or semi-persistent.
  • the base station may transmit configuration information (configuration information) related to the CSI (downlink) to the terminal, the configuration information may include at least one of the following information.
  • the beam information of the base station according to the angular information may be represented by an oversampling factor (ol, o2, etc.), the number of combining beams, the heading, the index of the corresponding beam, and the like.
  • Information may include
  • the beam information may include priority information on the beam.
  • the beam information, the terminal is a space to the base station It may also include information for setting whether to report a rotation parameter.
  • LC codebook As an example, a method of constructing a linear combination (LC) codebook (hereinafter referred to as an LC codebook) will be described.
  • w, [ B, which corresponds to the information of the wideband attribute of the LC codebook , and may be configured in the form of a block diagonal matrix.
  • B 2 is contained in the block diagonal matrix Can be defined, b i ;
  • (ll L may correspond to the 2D and / or ID DFT beams represented in Equation 3.
  • the DFT beam indexes corresponding to b u may be arranged in ascending or descending order according to the position of a column of the DFT matrix.
  • the data may be selected and set based on the order of major influence on the channel information configuration based on angular information.
  • b u may be set to a value corresponding to the column indexes 3, 7, 15, and 27 of the DFT matrix, and 15 may be set according to the priority of the beam.
  • 3, 27, 7 may be set to a value corresponding to.
  • the base station transmits to the terminal Look at the transformation matrix information.
  • Significant values of channel information according to channel sparsity may mean features that are concentrated in a specific angular domain or a specific region of the channel covariance matrix.
  • Significant channel information in the baby may mean information in which the size of the corresponding channel information element is greater than or equal to a specific reference value. Therefore, if the channel angular property between the base station and the terminal is known, channel information can be estimated with a high level of accuracy while reducing feedback overhead.
  • the above principle can be used.
  • Valid values of the channel information may be influenced according to properties of a transformation matrix (eg, DFT matrix, orthogonality) with respect to the actual channel matrix.
  • the base station may instruct and / or set itself to share information about the transformation matrix with the terminal.
  • the base station may set the terminal to use a predefined matrix as a transformation matrix.
  • the transformation matrices can be represented by and T 2
  • the channel information matrix can be represented by X (M by K).
  • the converted It can be expressed as.
  • the size of the transformation matrix may vary depending on the size of the channel information matrix X, and the channel information matrix X may be a covariance matrix of the channel or the channel itself.
  • M by M DFT matrix M by M size transformation matrix T 2 (e.g. DFT matrix).
  • the CSI report (ie, feedback) of the terminal may be classified according to a method instructed by the terminal or the base station.
  • the UE may use the angular domain shape in the angular region of the channel covariance matrix by performing a DFT operation on the transform matrix and T 2 for CSI reporting.
  • the terminal may apply a steering matrix to the AoA / AoD and use it for CSI immediateization and / or calculation.
  • it may be necessary to explain whether each call matrix is reflected.
  • setting and / or instruction on the transmitter and / or receiver side may be required for the corresponding angle value (s) and the matrix shape reflecting the adjustment matrix.
  • it may be set to a value such as an identity matrix.
  • the measurement of the channel state information in the Massive MINIO environment is the main angle (angle) and angle spread (signal path) of the signal path of the reference signal (RS) between the base station and the terminal ( may be affected by angular spread. Therefore, angular information on the signal between the terminal and the base station
  • the transformation matrix may be constructed by extracting a specific column of the transformation matrix aligned in a similar direction.
  • the spatial rotation along with the DFT motion F is compensated for.
  • the channel sparsity can be improved by reducing the magnitude of the angle diffusion.
  • channel information to which the DFT operation and spatial rotation are applied may be configured as shown in Equation 7 below.
  • Equation 7 In Equation 7, p ki denotes the complex gain of the corresponding sub-channel, and 0 ( (
  • > k ) diag ⁇ (l, ⁇ k ,, eK NT - 1) ) Represents the spatial rotation matrix and ' e represents the spatial rotation matrix
  • a (0) is affected by the antenna structure as an array manifold vector.
  • it shows the shape of the neck and shape of ULA (Uniform Linear Array), and d is the distance between antennas.
  • A represents the wavelength of the signal.
  • S a (0 k4 ) represent sub-channels in the beam-space and are orthogonal to each other.
  • / a (0 k, i ) may correspond to a specific column of the DFT matrix.
  • the terminal Upon receiving the configuration information related to the CSI (downlink) as described above from the base station, the terminal uses one or more of the configuration information related to the CSI to transfer some or all of the following channel state information (CSI) to the base station. Report (i.e. feedback).
  • the channel state information may include information about an LC codebook.
  • the channel state information may include parameter resolution information according to payload size.
  • the channel state information may include angle information of the downlink channel.
  • the angle information may include information such as A O D (S), the angle spread.
  • the angle information may be reported to the base station when the feedback of the spatial rotation parameter is set.
  • Method 3-1 As described above, through the transformation matrix, sparsity of channel information in the wireless situation under consideration can be secured, and various channel information can be obtained by utilizing characteristics represented by significant values in sparse channel information. The required value can be calculated.
  • a method of transforming and using a channel covariance matrix into a low-dimensional matrix may be considered.
  • the terminal may select a column indicating the beam direction in the transformation matrix. Thereafter, the terminal may report to the base station the index of the selected column and the number of columns in the transformation matrix known to the base station and the base station. In addition, the terminal may extract channel characteristics of the angular region in the downlink by using the downlink and / or uplink reference signal (RS). In addition, the terminal may be used when calculating the CSI to feed back the angle information, it may be reported to the base station.
  • RS uplink reference signal
  • the UE may calculate a spatial rotation parameter for further improving the sparsity of the channel along with the DFT operation to reduce the feedback overhead, and report the result to the base station. have.
  • the base station may restore the actual channel information by using the spatial rotation parameter value received from the terminal in a spatial rotation matrix previously promised by the base station and the terminal.
  • Equation 8 The channel covariance matrix C 'to which the spatial rotation 4> (0 iter ) and the DFT operation are applied based on each set spatial rotation parameter value may be expressed by Equation 8 below.
  • Equation 8 At this time, in the modified channel covariance matrix (s) as above, The coefficients coefficient ⁇ may be assumed to be valid values, and the number thereof may be represented by n ((0 iter ).
  • the terminal may search for one-dimensional spatial rotation parameter 0 where n (C '( it hail)) is the smallest. Calculate through (one-dimensional search), and arrange space rotation Report to the base station.
  • the UE may report a value for the corresponding DFT beam index (es) to the base station at this time.
  • the terminal By reporting the calculated spatial rotation parameter to the base station, the terminal can be set so that the base station has the same spatial rotation matrix. Thereafter, the base station can restore the channel covariance matrix C using the set spatial rotation matrix.
  • the spatial rotation parameter information corresponding to the new CSI report may be reported in subband CSI in consideration of frequency selectivity in terms of performance gain. Or, it may be reported as a wideband CSI in consideration of a payload side. Or, it may be reported as a combination of wideband CSI and subband CSI. For example, rough information corresponding to 4 bits may be reported in wideband CSI, and information corresponding to lbit may be reported in subband CSI.
  • the information on the LC codebook may include information related to the precoding matrix.
  • a process of acquiring channel information by a base station fed back from the terminal with channel state information including information on the LC codebook may be as follows. This is merely an example and may be applied to other feedback schemes.
  • the spatial rotation matrix yaw may be configured as in Equation (9).
  • a result of applying spatial rotation to a column of each DFT matrix may be obtained, and a covariance matrix CT may be configured based on this.
  • the number of beams may be reduced according to the degree of sparsity of the channel as compared to the number of beam candidates set by the base station, and the index of the column of the corresponding DFT matrix may also be changed. Therefore, the UE may report the changed L and DFT column indexes to the base station.
  • the terminal may recommend L and DFT column indexes to the base station.
  • the terminal may transmit information on the preferred L and DFT column indexes to the base station.
  • the codebook for 13 words ⁇ 1 may be expressed as Equation 12. This is just one example and can of course also be applied to codebooks for other chunks.
  • the matrix is a general form of a matrix representing subband attributes in the LC codebook, and a combining coefficient parameter. It can consist of c and 0. Where c represents an amplitude value and 0 represents a phase value.
  • the terminal may report the combined coefficient parameters collectively or independently to the base station. Alternatively, the terminal may set a parameter promised in advance between the terminal and the base station as a base station.
  • the coupling coefficient parameters C and 0 may be set as in the examples below.
  • the number of bits used for reporting may be determined according to the method of quantizing c and / or the degree of quantization. For example, it is basically set to ⁇ 0,1 ⁇ or ⁇ 0.5,1 ⁇ for 1-bit quantization, and can be quantized by mapping at uniform intervals according to the number of bits.
  • ⁇ 0.75,1 ⁇ or 1 may be set to the beam having the main influence on the channel, and the remaining beams may not be selected.
  • the remaining resolution except for the beam that has a major influence on the channel may be mapped to ⁇ 0,0.5 ⁇ or ⁇ 0,0.25 ⁇ to increase the combining resolution for the same bit allocation.
  • all L beams set may be used, or the number of beams to be used for combining may be indicated and / or set to a specific value to perform linear combining.
  • the optimized spatial rotation can be applied to set the beam in the direction corresponding to the angular characteristics of the channel between the terminal and the base station, while reducing the number of beams are coupled to the power (power) The loss is more effective.
  • the terminal may perform quantization of the phase by dividing the angle uniformly by a given bit with respect to the starting value and the range of the setting angle.
  • the beams having a major influence on the channel between the base station and the terminal may be selected by reflecting a spatial rotation matrix R to W1 having a wideband property, the influence on the phase value 0 Rather, the method of quantizing the magnitude value c with a high resolution may be preferred.
  • the quantization payload for one element of W2 is fixed, the number of bits may be allocated at the same ratio for c and 0, or the number of bits corresponding to c may be allocated asymmetrically. .
  • L beams that are previously set or indicated are A codebook with high accuracy can be constructed with L '( ⁇ L) beams. This can be efficient in reporting the beam index and has an effect of reducing the number of combining coefficient (s) corresponding to the subband CSI reporting.
  • the terminal performs spatial rotation on a range of SD basis beams using a spatial rotation parameter, a total of 21 combining coefficients for the range set based on the angle information. On that beam Can report.
  • the terminal may report to the base station by differentially applying the quantization of the coupling coefficients by using the priority of the corresponding beam.
  • the reporting of information eg, angular information and / or CSI, etc.
  • the method (s) proposed in the present specification may be performed by performing a report on every channel measured in the time domain and / or the frequency domain. It may be performed in a short-term manner or may be performed in a long-term manner in which reporting is performed at intervals of a specific duration.
  • the method (s) proposed herein feeds back a channel (ie, channel state information, CSI) using AoD, AoA, etc. based on two-dimensional (2D, 2D) channel modeling.
  • a channel ie, channel state information, CSI
  • the method (s) is extended to three-dimensional (3D) channel modeling, but may also be applied to channels considering zenith angles of departure (ZoD) and zenith angles of arrival (Zoa).
  • ZoD zenith angles of departure
  • Zoa zenith angles of arrival
  • Equation 13 a channel considering both horizontal and vertical information may be expressed by forming a Kronecker product as shown in Equation 13 below.
  • Equation 1 4 Equation 1 4 below.
  • the two-dimensional array manifold vector may be configured through each array manifold vector assuming ULA in a horizontal and vertical environment.
  • horizontal and / or vertical DoA values and 3 ⁇ 4 may be estimated through UL channel information.
  • spatial rotation matrices can also be constructed utilizing values in the horizontal and / or vertical angle regions.
  • the spatial rotation matrix may be constructed based on N T one- or two-dimensional DFT beams or specific orthogonality.
  • 17 is a CSI to which an embodiment proposed in the present specification may be applied.
  • An example of a signaling procedure between a base station and a terminal for feedback is shown. 17 is merely for convenience of description and does not limit the scope of the present invention. Referring to FIG. 17, it is assumed that a terminal and a base station operate based on the above-described methods 1), 2), and 3). That is, the procedure shown in FIG. 17 shows an example of a method of reducing feedback overhead while increasing the accuracy of CSI feedback by using angle information 5.
  • the base station may transmit configuration information related to the CSI to the terminal (S1710).
  • the configuration information may be based on method 2 described above.
  • the configuration information related to CSI may include transform matrix information for estimating L0 angle information, spatial rotation matrix information, and total payload size information for CSI feedback.
  • the configuration information may include beam information of the base station according to the angle information.
  • the beam information of the base station according to the angle information may include information such as an oversampling factor, the number of combined beams of the base station and the index of the corresponding beam.
  • the terminal receives the configuration information from the base station, and then a reference signal (for example:
  • CSI-RS may be received (S1720).
  • the terminal may calculate angle information (3 ⁇ 4ngular information) based on at least one of the CSI-RS and / or the configuration information received from the base station (S1730).
  • the calculation of the angle information may be based on the above-described method 1), method 3) 20 and the like.
  • the angle information may include information about at least one of i) the direction of the signal, ii) the angle spread, iii) the spatial rotation parameter and / or iv) the number of beams of the transformation matrix and the corresponding index.
  • the terminal may measure and / or calculate downlink channel state information (CSI) including information on a linear combination (LC) codebook (hereinafter, referred to as an LC codebook) based on the configuration information and the angle information.
  • CSI downlink channel state information
  • LC codebook linear combination codebook
  • the calculation of the channel state information may be based on the above method 3).
  • a method of calculating information about the linear combination codebook may be as follows. For example, according to the aforementioned method 3) (methods 3-1 to 3-3), the terminal calculates the index of the beam and the number of beams by applying spatial rotation to the beam group and / or the combination You can report it.
  • the terminal may calculate and report a coupling coefficient of W2 having a subband channel attribute based on the angle information.
  • the terminal may report the channel state information to the base station (S1750).
  • 18 shows another example of a signaling procedure between a base station and a terminal for CSI reporting to which an embodiment proposed in the present specification can be applied. Figures are merely for convenience of description and do not limit the scope of the invention.
  • the terminal may calculate angle information (S1810).
  • the calculation of the angle information may be based on the above-described methods 1) and 3).
  • the angle information may be calculated based on at least one of configuration information for CSI feedback and / or CSI-RS received by the terminal from the base station. This may be considered to correspond to steps S1710 to S1730 of FIG. 17. Accordingly, detailed descriptions that overlap are omitted.
  • the terminal may transmit the calculated angle information to the base station (S1820).
  • the base station rotates the space appropriate to the beam state of the base station based on the received angle information
  • Parameter setting information may be transmitted to the terminal (S1830).
  • the spatial rotation parameter setting information may be based on the method 2) described above.
  • the spatial rotation parameter setting information may include beam information of the base station, and the beam information of the base station may include an oversampling factor, the number of combined beams, and index information of the corresponding beam.
  • the spatial rotation parameter setting information may include information and / or angle information about a beam preferred by the base station.
  • the terminal may measure and / or calculate channel state information based on the spatial rotation parameter setting information received from the base station (S1840), and report the channel state information to the base station (S1850). As mentioned earlier, this procedure is based on AoD,
  • FIG. 19 shows an example of an operation flowchart of a terminal performing CSI reporting in a wireless communication system to which the method proposed in this specification can be applied. 19 is merely for convenience of description and does not limit the scope of the present invention.
  • the terminal and the base station are the methods 1), 2), described above in this specification.
  • the terminal is connected to the downlink channel (downlink channel) 2019/208992 1 »(: 1/10 ⁇ 019/004836
  • configuration information related to the CSI may be received (S1910).
  • the configuration information may be based on the method 2) described above.
  • the configuration information may include transform matrix information for estimating angle information of the terminal, information about a spatial rotation matrix, and the like.
  • the configuration information may include information related to the CSI reporting setting.
  • the configuration information may be delivered through semi-static signaling (eg, RRC signaling, etc.).
  • the terminal may receive a reference signal (eg, CSI-RS) for the CSI report from the base station (S1920).
  • a reference signal eg, CSI-RS
  • the terminal may calculate angle information based on at least one of the configuration information and / or the reference signal (for example, CSI-RS) (S1930).
  • the calculation of the angle information may be based on the above-described method 1), method 3), and the like.
  • the angle information may include information on at least one of i) the direction of the signal, H) the angle spread, iii) the spatial rotation parameter, and / or iv) the number of beams of the transformation matrix and the corresponding index.
  • the terminal may perform CSI calculation and reporting to the base station based on the configuration information and the angle information (S1940).
  • the CSI report may include information on a linear combination codebook.
  • the CSI may include information such as a spatial rotation parameter, the number of beams of a transformation matrix, a corresponding index, and a coupling coefficient of quantized and / or quantized beams.
  • the CSI calculation may be based on the method 3) described above.
  • the calculation of the CSI the terminal is the configuration information and / or the CSI-RS Calculating angle information including a spatial rotation parameter based on at least one of the following;
  • the information on the LC codebook may be calculated based on the angle information and the setting information.
  • the calculation of the spatial rotation parameter may include: setting, by the terminal, the spatial rotation parameter internally at a specific resolution or method; Deriving a channel covariance matrix to which a spatial rotation and a DFT operation are applied based on the set spatial rotation parameter; And a spatial rotation parameter in which coefficients greater than or equal to a specific threshold value are assumed as valid values in the channel covariance matrix, and the number of valid coefficients is smallest. Calculating a through a one-dimensional search; Through the spatial rotation parameter 4 > ⁇ 1 ° 1 can be calculated.
  • the UE may report the CSI to the base station including the spatial rotation parameter, and may also report a value for the DFT beam index (es) corresponding to the calculation of the spatial rotation parameter to the base station.
  • the base station and the terminal may be set to have the same spatial arm matrix. Thereafter, the base station can restore the channel covariance matrix using the set spatial rotation matrix.
  • the terminal receives data from the base station according to data scheduling information of the base station. can do.
  • 2 ⁇ shows an example of an operation flowchart of a terminal performing a CSI report in a wireless communication system to which the method proposed in this specification can be applied. 20 is only for convenience of description, it is intended to limit the scope of the invention ⁇ ⁇ 0 2019/208992 1 »(1 ⁇ 1 ⁇ 2019/004836
  • the terminal may calculate the angle information (32010).
  • the calculation of the angle information may be based on the above-described method 1), method 3), and the like.
  • the angle information may be configuration information for feedback 031 received by the terminal from the base station and / or Can be killed based on at least one of the. This may correspond to a procedure corresponding to steps 31910 to 31930 in FIG. 19. Accordingly, detailed descriptions that overlap are omitted.
  • the setting information may include transformation matrix information and spatial rotation matrix information for calculating the angle information.
  • the terminal may report the angle information to the base station (32020). At this time, the report may also be performed.
  • the terminal may receive spatial rotation parameter setting information from the base station (eg, 3203.
  • the spatial rotation parameter setting information may be set based on the giga-degree information, an oversampling factor, combined It may include information about the beam of the base station, such as the number of beams and the index of the beam, etc.
  • the spatial rotation parameter setting information may include information and / or angle information about the beam preferred by the base station. have.
  • the terminal may measure and / or calculate 031 based on the spatial rotation parameter setting information and report it to the base station (32040).
  • 21 is a wireless communication system to which the method proposed in the present specification can be applied. An example of an operation flowchart of a base station receiving a report is shown. Degree 2019/208992 1 »(: 1 ⁇ 112019/004836
  • a terminal and a base station perform CSI reporting (ie, feedback) based on the above-described methods 1), 2), 3), and the like.
  • the base station may transmit configuration information (configuration information) # associated with the CSI (for the downlink channel) (S2110).
  • the configuration information may be based on the above-described method 2).
  • the configuration information may include transform matrix information for estimating angle information of the terminal, information about a spatial rotation matrix, and the like.
  • the configuration information may include information on the total payload size for CSI reporting of the 0 terminal.
  • the configuration information may include beam information of the base station according to the angle information transmitted by the terminal.
  • the beam information of the base station may include an oversampling factor, the number of combined beams of the base station, index information of the corresponding beam, and the like. At this time, priorities for the combined beams may be designated.
  • 5 the configuration information may include information related to the CSI reporting setting. In this case, the configuration information may be delivered through semi-static signaling (eg, RRC signaling, etc.).
  • the base station may transmit at least one reference signal (eg, CSI-RS) for the CSI report to the terminal (S2120).
  • CSI-RS reference signal
  • the base station can receive the angle information from the terminal (S2130).
  • the angle information may be derived based on the method 1) described above.
  • the angle information is a CSI-RS received by the terminal from the base station And / or based on at least one of the CSI related configuration information.
  • the base station may transmit the spatial rotation parameter setting information to the terminal based on the angle information (S2140).
  • the spatial rotation parameter setting information may be based on the method 2) described above.
  • the spatial rotation parameter setting information may include information about the beam of the base station such as an oversampling factor, the number of combined beams, and the index of the corresponding beam.
  • the spatial rotation parameter setting information may include information and / or angle information about a beam preferred by the base station.
  • the above-described step S2130 and / or step S2140 may be omitted.
  • the base station may receive a CSI report from the terminal (S2150), for example, the CSI may be calculated based on the above-described method 3).
  • the CSI may be calculated based on the spatial rotation parameter setting information.
  • the CSI report may include information about the LC codebook, spatial rotation parameter information, and the like. In this case, since the contents related to the CSI calculation are the same as those described with reference to FIG. 19, detailed descriptions thereof will be omitted.
  • the base station receiving the CSI report may calculate data scheduling and single user (SU) / multi user (MU) -MIMO precoding in consideration of the channel state of the terminal.
  • the base station may transmit the calculated precoding data and RS for decoding of the data (eg, DMRS, yoi) to the UE.
  • downlink means communication from the base station to the terminal
  • uplink means communication from the terminal to the base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • the base station may be represented by the first communication device and the terminal by the second communication device.
  • a base station (BS) is a fixed station (Node), Node B, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G). Network), AI (Artificial Intelligence) system / module, RSU (road side unit), robot, drone (Unmanned Aerial Vehicle, UAV) f
  • a terminal may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an advanced mobile (AMS). Station), WT (Wireless terminal),
  • 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
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • vehicle vehicle
  • RSU road side unit
  • robot robot
  • AI Artificial Intelligence Module
  • drone Unmanned Aerial Vehicle, UAV
  • Augmented Reality AR
  • VR Virtual Reality
  • FIG. 22 illustrates a block diagram of a wireless communication apparatus to which the methods proposed herein may be applied.
  • a wireless communication system includes a base station 2210-and a plurality of terminals 2220-located in a base station area.
  • the base station and the terminal may each be represented by a wireless device.
  • the base station 2210 includes a processor 2211, a memory 2212, and an RF unit 2213.
  • the processor 2211 implements the functions, processes, and / or methods proposed in FIGS. 1 to 21. Layers of the air interface protocol may be implemented by a processor.
  • the memory is connected to the processor and stores various information for driving the processor.
  • the RF unit 2213 is connected to the processor to transmit and / or receive a radio signal.
  • the processor 2211 may control the RF unit 2213 to transmit configuration information related to the CSI for the downlink channel to the terminal (S2110).
  • the processor 2211 may control the RF unit 2213 to transmit at least one CSI-RS for the CSI report to the terminal (S2120).
  • the processor 2211 may control the RF unit 2213 to receive a CSI report calculated by the terminal based on the configuration information and the angle information from the terminal (S2150).
  • the angle information may be calculated by the terminal based on at least one of the configuration information and / or the CSI-RS.
  • the processor 2211 may calculate data scheduling and single user (SU) / multi user (MU) -MIMO precoding in consideration of the channel state of the terminal.
  • the processor 2211 is calculated by controlling the RF unit 2213 2019/208992 1 > (1 '/ 10.2019 / 004836
  • Precoding Data and Decoding of Data 110 may be transmitted to the terminal.
  • the terminal includes a processor 2221, a memory 2222 ⁇ and an RF unit 2223.
  • the processor 2221 ⁇ implements the functions, processes, and / or methods proposed in FIGS. 1 to 21 above.
  • the layers may be implemented by the processor 2221.
  • the memory 2222 is connected to the processor 2221 to store various information for driving the processor 2221.
  • the RF unit 2223 is a processor 2221. And transmit and / or receive a radio signal.
  • the processor 2221 may control the RF unit 2223 to receive configuration information related to the CSI for the downlink channel from the base station (S1910).
  • the processor 2221 may control the RF unit 2223 to receive the CSI-RS for the CSI report from the base station (S1920).
  • the processor 2221 may calculate angle information based on at least one of the configuration information and / or the CSI-RS.
  • the processor 2221 may calculate a CSI to be fed back based on the received setting information and the angle information (S2240).
  • the CSI report may include information on a linear combination codebook.
  • the information fed back by the terminal may be a spatial rotation parameter, the number of beams of the transformation matrix, and the corresponding information. It may include information such as an index, a coupling coefficient of the quantized / unquantized beam, and the like.
  • the processor 2221 may preset the spatial rotational parameters in a specific resolution or manner. to the next The processor 2221 may plot a channel covariance matrix to which a spatial rotation and a DFT operation are applied based on the set spatial rotation parameter. At this time, the processor 2221 assumes coefficients that are greater than or equal to a certain threshold value in the channel covariance matrix as valid values, and a spatial rotation parameter in which the number of valid coefficients is smallest. Can be calculated through one-dimensional search.
  • the UE may report the CSI to the base station including the spatial rotation parameter, and at this time, the value of the corresponding DFT beam index (es) may be reported to the base station.
  • the base station and the terminal can be set to have the same spatial rotation matrix. Thereafter, the base station can restore the channel covariance matrix using the set spatial rotation matrix.
  • the terminal can receive data from the base station according to data scheduling information of the base station. have.
  • the processor 2221 may determine the number of beams of the transformation matrix and corresponding indexes, the coupling coefficients of the quantized / unquantized beams, and the like based on the angle information such as the spatial rotation parameter. It is possible to calculate the information of. Thereafter, the processor 2221 may control the RF unit 2223 to report the calculated CSI feedback to the base station (S1940).
  • the memories 2212 and 2222 may be inside or outside the processors 2211 and 2221, and may be connected to the processor by various well-known means.
  • the base station and / or the terminal may have a single antenna or multiple antennas. 02019/208992 1 ⁇ / 10 ⁇ 019/004836
  • FIG. 23 is another example of a block diagram of a wireless communication apparatus to which the methods proposed herein may be applied.
  • a wireless communication system includes a reporter station 2310 and a plurality of terminals 2320 located in a base station area.
  • the base station may be represented by a transmitting device, the terminal may be represented by a receiving device, and vice versa.
  • the base station and the terminal are a processor (processor, 2311,2321), memory (memory, 2314,2324), one or more Tx / Rx RF module (radio frequency module, 2315, 2325), Tx processor (2312, 2322), Rx processor ( 2313, 2323), antennas (2316, 2326).
  • the processor implements the salping functions, processes and / or methods above.
  • the processor 2311 implements the functionality of the L2 layer.
  • the processor provides the terminal 2 320 with multiplexing, radio resource allocation between logical channels and transport channels, and is responsible for signaling to the terminal.
  • the transmit (TX) processor 2312 implements various signal processing functions for the L1 layer (ie, the physical layer).
  • the signal processing function enables the FEC (forward error correct ⁇ on ⁇ 0 1) at the terminal and includes coding 3 ⁇ 4 interleaving.
  • the encoded and modulated symbols are divided into parallel streams, and each stream is OFDM A physical channel that is mapped to a subcarrier, multiscaled with a reference signal (RS) in the time and / or frequency domain, combined together using an Inverse Fast Fourier Transform (IFFT) to carry a time domain OFDMA symbol stream.
  • RS reference signal
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially prenamed to produce a multi-spatial stream.
  • Each spatial stream may be provided to a different antenna 2316 via a separate Tx / Rx module (or transceiver 2315).
  • Each Tx / Rx module can modulate an RF carrier with each spatial stream for transmission.
  • each Tx / Rx module (or transceiver 2325) receives a signal through each antenna 2326 of each Tx / Rx module.
  • Each Tx / Rx module recovers information modulated onto an RF carrier and provides it to a receive (RX) processor 2323.
  • the RX processor implements the various signal processing functions of layer 1.
  • the RX processor may perform spatial processing on the information to recover any spatial stream destined for the terminal.
  • the RX processor uses fast Fourier transform (FFT) to convert the OFDMA symbol stream from the time domain to the frequency domain.
  • the frequency domain signal includes a separate OFDMA symbol stream for each subcarrier of the OFDM signal.
  • the symbols and reference signal on each subcarrier are recovered and demodulated by determining the most likely signal placement points sent by the base station. Such soft decisions may be based on channel estimate values. Soft decisions are decoded and deinterleaved to recover the data and control signals originally transmitted by the base station on the physical channel. Corresponding data and control signals are provided to the processor 2321.
  • the UL (communication from terminal to base station) is processed at base station 2310 in a manner similar to that described with respect to receiver functionality at terminal 2320.
  • Each Tx / Rx module 2325 receives a signal via a respective antenna 2326.
  • Each The Tx / Rx module provides the RF carrier and information to the RX processor 2323.
  • the processor 2321 may be associated with a memory 2324 that stores program code and data.
  • the memory may be referred to as a computer readable medium.
  • 24 illustrates an example of a signal processing module structure in a transmission device.
  • signal processing may be performed in a processor of a base station / terminal such as the processors 2211 and 2221 of FIG. 22.
  • a transmission device in a terminal or a base station includes a scrambler 2401, a modulator 2402, a layer mapper 2403, an antenna port mapper 2404, a resource block mapper 2405, and a signal generator 2406. can do.
  • the transmitting device may transmit one or more codewords. Coded bits in each codeword are scrambled by the scrambler 2401 and transmitted on the physical channel.
  • the codeword may be referred to as a data string and may be equivalent to a transport block which is a data block provided by the MAC layer.
  • the scrambled bits are modulated into complex-valued modulation symbols by modulator 2402.
  • the modulator 2402 may arrange the scrambled bits as complex modulation symbols representing positions on signal constellations by modulating the scrambled bits.
  • m-PSK m-Phase Shift Keying
  • m-QAM m-Quadrature Amplitude Modulation
  • the modulator may be referred to as a modulation mapper.
  • the complex modulation symbol may be mapped to one or more transport layers by a layer mapper 2403. Complex modulation symbols on each layer may be mapped by antenna port mapper 2404 for transmission on the antenna port.
  • the resource block mapper 2405 may map the complex modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission.
  • the resource block mapper may map the virtual resource block to a physical resource block according to an appropriate mapping scheme.
  • the resource block mapper 2405 may assign a complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex according to a user.
  • the signal generator 2406 modulates a complex modulation symbol for each antenna port, that is, an antenna specific symbol by a specific modulation scheme, for example, an Orthogonal Frequency Division Multiplexing (OFDM) scheme, thereby complex-valued time domain.
  • An OFDM symbol signal can be generated.
  • the signal generator may perform an inverse fast fourier transform (IFFT) on the antenna specific symbol, and a cyclic prefix (CP) may be inserted into the time domain symbol on which the signal is performed.
  • IFFT inverse fast fourier transform
  • CP cyclic prefix
  • the OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like.
  • the signal generator may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.
  • a transmission device in a terminal or a base station may include a scrambler 2501, a modulator 2502, a layer mapper 2503, a precoder 2504, a resource block mapper 2505, and a signal generator 2506. Can be.
  • the transmitting device may scramble the coded bits in the codeword by the scrambler 2501 for one codeword and then transmit the same through a physical channel.
  • the scrambled bits are modulated into complex modulation symbols by modulator 2502.
  • the modulator may be arranged as a complex modulation symbol representing a position on a signal constellation by modulating the scrambled bit according to a predetermined modulation scheme.
  • a predetermined modulation scheme There is no restriction on the modulation scheme, and it includes pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PK (m-Phase Shift-Keying), or rri-QAM (m-Quadrature Amplitude Modulation) This can be used for modulation of the encoded data.
  • the complex modulation symbol may be mapped to one or more transport layers by the layer mapper 2503.
  • Complex modulation symbols on each layer may be precoded by the precoder 2504 for transmission on the antenna port.
  • the precoder may perform pre-coding on the basis of transform precoding on complex modulation symbols.
  • the precoder may perform precoding without performing transform precoding.
  • Precoder 2504 stores the complex modulation symbol.
  • the antenna specific symbols may be co-ordinated by the MIMO scheme according to the multiple transmit antennas, and the antenna specific symbols may be distributed to the corresponding resource block mapper 2505.
  • the output z of the precoder 2504 can be obtained by multiplying the output y of the layer mapper 2503 by the precoding matrix W of N ⁇ M. Where N is the number of antenna ports and M is the number of layers.
  • Resource block mapper 2505 maps the demodulation modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission.
  • the resource block mapper 2505 may assign a complex modulation symbol to an appropriate subcarrier and multiplex according to a user.
  • the signal generator 2506 modulates the complex modulation symbol in a specific modulation scheme, for example, the OFDM scheme, to complex-valued time domain.
  • Orthogonal Frequency Division Multiplexing (OFDM) symbol signals may be generated.
  • Signal generator 2506 is configured for antenna specific symbols.
  • IFFT Inverse Fast Fourier Transform
  • CP cyclic prefix
  • the OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like.
  • Signal generator 2506 may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.
  • the signal processing of the receiver may be configured as the inverse of the signal processing of the transmitter.
  • the processor 2211, 2221 of the transmitting device decodes a radio signal received through the antenna port (s) of the transceiver from the outside and Perform demodulation.
  • the receiving device may include a plurality of multiple receiving antennas, and each of the signals received through the receiving antenna is restored to the baseband signal and then restored to the data sequence originally intended to be transmitted by the transmission device through multiplexing and MIMO demodulation.
  • the receiver may include a signal recoverer for recovering the received signal into a baseband signal, a multiplexer for combining and multiplexing the received processed signals, and a channel demodulator for demodulating the multiplexed signal sequence with a corresponding codeword.
  • the signal reconstructor, multiplexer, and channel demodulator may be configured as one integrated module or each independent module for performing their functions. More specifically, the signal reconstructor is an analog-to-digital converter (ADC) for converting an analog signal into a digital signal, a CP canceller for removing a CP from the digital signal, and a fast Fourier transform (FFT) to the signal from which the CP is removed. FFT module for outputting a frequency domain symbol by applying a, and may include a resource element demapper (equalizer) to restore the frequency domain symbol to an antenna specific symbol. The antenna specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword intended to be transmitted by a transmitting device by a channel demodulator.
  • ADC analog-to-digital converter
  • FFT fast Fourier transform
  • a wireless device includes a base station, a network node, a transmitting terminal, a receiving terminal,
  • Wireless devices wireless communication devices, vehicles, vehicles with autonomous driving, unmanned aerial vehicles (AIV) f AI (artificial intelligence) modules, robots, AR (Augmented Reality) devices, VR (Virtual Reality) devices, MTC devices IoT devices, medical devices, fintech devices (or financial devices), security devices, Climatic / environmental devices or other quaternary industrial revolutions or devices related to 5G services.
  • AIV unmanned aerial vehicles
  • AI artificial intelligence
  • robots AR (Augmented Reality) devices
  • VR Virtual Reality
  • MTC devices IoT devices medical devices
  • fintech devices or financial devices
  • security devices Climatic / environmental devices or other quaternary industrial revolutions or devices related to 5G services.
  • a drone may be a vehicle in which humans fly by radio control signals.
  • the MTC device and the IoT device are devices that do not require human intervention or manipulation, and may be smart meters, bending machines, thermometers, smart bulbs, door locks, various sensors, and the like.
  • a medical device is a device used to examine, replace, or modify a device, structure, or function used for diagnosing, treating, alleviating, treating, or preventing a disease, such as a medical device, a surgical device, ( In vitro) diagnostic devices, hearing aids, surgical devices, and the like.
  • a security device is a device installed to prevent a risk that may occur and to maintain safety, and may be a camera, a CCTV, a black box, or the like.
  • the fintech device is a device that can provide financial services such as mobile payment, and may be a payment device, a Point of Sales (POS), or the like.
  • the climate / environmental device may mean a device for monitoring and predicting the climate / environment.
  • the terminal is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet PC (tablet PC), ultrabook, wearable device (e.g., smartwatch, glass glass, head mounted display), foldable device And the like.
  • the HMD is a head-worn display device, which can be used to implement VR or AR. have.
  • the embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FFGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FFGAs field programmable gate arrays
  • an embodiment of the present invention may be implemented as a module, a procedure, a function, or the like for performing the functions or operations described above. 2019/208992 1 »(: 1 ⁇ 1 ⁇ 2019/004836
  • the software code may be stored in memory and driven by the processor.
  • the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • a method for transmitting and receiving channel state information includes 30 system and 50 system.
  • the example is applied to a system), but it is possible to apply to various wireless communication systems.

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Abstract

L'invention concerne un procédé d'émission ou de réception d'informations d'état de canal dans un système de communication sans fil et concerne un dispositif associé. Plus précisément, un procédé permettant de rapporter des informations d'état de canal (CSI) au moyen d'un terminal dans un système de communication sans fil peut comprendre les étapes consistant : à recevoir, depuis une station de base, des informations de configuration relatives aux CSI pour un canal de liaison descendante ; à recevoir, depuis la station de base, au moins un CSI-RS pour rapporter les CSI ; à extraire des informations d'angle depuis des informations de configuration et/ou depuis le CSI-RS ; et à extraire les CSI sur la base des informations de configuration et des informations d'angle, et à rapporter les CSI à la station de base.
PCT/KR2019/004836 2018-04-23 2019-04-22 Procédé d'émission ou de réception d'informations d'état de canal dans un système de communication sans fil et dispositif associé WO2019208992A1 (fr)

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WO2022060825A1 (fr) * 2020-09-15 2022-03-24 Ntt Docomo, Inc. Dispositif et procédé d'exécution de formation de faisceaux dans des domaines à retard angulaire
TWI744063B (zh) * 2020-10-30 2021-10-21 瑞昱半導體股份有限公司 無線通訊系統與傳輸速率控制方法
WO2022116875A1 (fr) * 2020-12-01 2022-06-09 维沃移动通信有限公司 Procédé, appareil et dispositif de transmission, et support de stockage lisible
CN116671030A (zh) * 2020-12-29 2023-08-29 株式会社Ntt都科摩 终端以及基站
CN113766541A (zh) * 2021-09-07 2021-12-07 北京交通大学 Mmtc场景下的活跃设备及其使用信道的检测方法
CN113766541B (zh) * 2021-09-07 2023-10-17 北京交通大学 Mmtc场景下的活跃设备及其使用信道的检测方法
WO2024088001A1 (fr) * 2022-10-25 2024-05-02 华为技术有限公司 Procédé de transmission d'informations et appareil de communication

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