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WO2020060345A1 - Procédé de transmission et de réception d'informations d'état de canal sur la base d'un livre de codes haute résolution dans un système de communication sans fil, et appareil associé - Google Patents

Procédé de transmission et de réception d'informations d'état de canal sur la base d'un livre de codes haute résolution dans un système de communication sans fil, et appareil associé Download PDF

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Publication number
WO2020060345A1
WO2020060345A1 PCT/KR2019/012310 KR2019012310W WO2020060345A1 WO 2020060345 A1 WO2020060345 A1 WO 2020060345A1 KR 2019012310 W KR2019012310 W KR 2019012310W WO 2020060345 A1 WO2020060345 A1 WO 2020060345A1
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Prior art keywords
csi
information
base station
pmi
resource
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English (en)
Korean (ko)
Inventor
김형태
박해욱
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • 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 specification relates to a wireless communication system, and more particularly, to a method for transmitting and receiving channel state information (Channel State Information, CSI) based on a codebook having a high resolution (high resolution) and an apparatus supporting the same.
  • CSI Channel State Information
  • Mobile communication systems have been developed to provide voice services while ensuring user mobility.
  • the mobile communication system has expanded not only to voice but also to data services, and now, due to the explosive increase in traffic, a shortage of resources is caused and users demand higher speed services, so a more advanced mobile communication system is required. .
  • next-generation mobile communication system The requirements of the next-generation mobile communication system are to support the explosive data traffic, the dramatic increase in the transmission rate per user, the largely increased number of connected devices, the very low end-to-end latency, and high energy efficiency. It should be possible.
  • dual connectivity massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), and super-wideband
  • MIMO massive multiple input multiple output
  • NOMA non-orthogonal multiple access
  • super-wideband Various technologies such as wideband support and device networking have been studied.
  • This specification proposes a method of transmitting and receiving channel state information (CSI) based on a high resolution codebook in a wireless communication system.
  • CSI channel state information
  • this specification classifies the CSI according to the payload size, and proposes a method for reporting a CSI with a large payload size aperiodically and a CSI with a small payload size periodically / permanently.
  • the present specification proposes a method for periodically and semi-permanently reporting the CQI applying the PMI / RI reported aperiodically (latest) and the CQI applying the PMI / RI at the time of CSI calculation.
  • this specification proposes a method for periodically / permanently reporting a flag for a difference value between a CQI applying a recently reported PMI / RI and a CQI applying a PMI / RI at the time of CSI calculation. .
  • this specification proposes a method to periodically and semi-permanently report a CQI and a corresponding PMI / RI measured by updating some PMI / RIs based on a recently reported PMI / RI aperiodically.
  • this specification proposes a method for transmitting a signal that triggers aperiodic CSI reporting based on the received CSI.
  • a method for reporting channel state information (CSI) by a user equipment (UE) in a wireless communication system comprising: receiving configuration information related to CSI reporting from a base station; Aperiodically transmitting a first CSI to the base station; Calculating first information on channel quality based on the CSI reporting related setting information; And the first information is calculated based on some of a plurality of precoding matrices associated with the first CSI, and transmitting a second CSI to the base station, wherein the second CSI is the plurality of precoding.
  • Information about some of the matrices and the first information may be included.
  • the second CSI may be periodically or semi-permanently transmitted.
  • the first CSI may include precoding matrix information for a linear combination (LC) codebook.
  • LC linear combination
  • some of the plurality of precoding matrices may be selected by the terminal based on the precoding matrix information for the linear combination (LC) codebook.
  • some of the plurality of precoding matrices may be selected in consideration of a beam direction indicated by the precoding matrix information for the linear combination (LC) codebook. have.
  • the precoding matrix information for the linear combination (LC) codebook corresponds to a precoding matrix indicator (PMI), and some of the plurality of precoding matrices are It may be composed of precoding matrices indicated by PMIs of a predetermined interval unit from the PMI.
  • PMI precoding matrix indicator
  • information on some of the plurality of precoding matrices may be used to update the precoding matrix information for the linear combination (LC) codebook.
  • the update may be related to at least one of a co-phase and an amplitude of the precoding matrix information for the linear combination (LC) codebook. You can.
  • the method further includes calculating second information about channel quality, and the second information may be calculated based on the entire number of the precoding matrices. .
  • the second CSI may further include the second information.
  • information on some of the first information and some of the plurality of precoding matrices used to calculate the first information is reported in units of subbands, and the 2 Information can be reported on a wide band basis.
  • the second CSI may be transmitted through PUCCH.
  • the CSI reporting related setting information may include information on the number of beams that are the target of the linear combination.
  • the first CSI includes information on a part of the beams that are the target of the linear combination
  • the second CSI is the beams that are the target of the linear combination. It may further include information about the rest.
  • the terminal is a transmitter / receiver for transmitting and receiving a radio signal, and And a processor functionally connected to the transmitter / receiver, wherein the processor controls the transmitter / receiver to receive CSI report-related configuration information from a base station, and provides channel quality based on the CSI report-related configuration information.
  • the first information and the second information are calculated, but the first information is calculated based on some of a plurality of precoding matrices, and aperiodically or semi-permanently transmitting the second CSI to the base station.
  • the second CSI may include information about some of the plurality of precoding matrices and the first information.
  • the CSI having a large payload size may be aperiodically reported based on the request of the base station, thereby efficiently using uplink resources required for CSI reporting.
  • the base station can determine whether the PMI / RI needs to be updated based on the CSI reported periodically or semi-permanently, and triggers aperiodic CSI reporting for PMI / RI update can do.
  • FIG. 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 shows a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in this specification can 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 by a wireless communication system to which the method proposed in this specification can be applied.
  • FIG. 5 shows examples of an antenna port and a resource grid for each neurology to which the method proposed in this specification can be applied.
  • FIG. 6 illustrates physical channels used in a 3GPP system and general signal transmission.
  • FIG. 7 shows an example of beam forming using SSB and CSI-RS.
  • FIG. 8 is a flowchart illustrating a downlink beam management procedure using SSB.
  • 9 is a view for explaining a downlink beam management procedure using CSI-RS.
  • FIG. 10 is a diagram for explaining a procedure for determining a received beam in a downlink beam management procedure using CSI-RS.
  • 11 is a diagram for explaining a procedure for determining a transmission beam in a downlink beam management procedure using CSI-RS.
  • FIG. 12 is a diagram for explaining resource allocation in a time and frequency domain in a downlink beam management procedure using CSI-RS.
  • 13 is a diagram for explaining an uplink beam management procedure using SRS.
  • FIG. 14 is a flowchart for explaining an uplink beam management procedure using SRS.
  • 15 is a flowchart illustrating an example of a CSI-related procedure.
  • 16 shows an example in which CSI reporting is performed per time slot to which the method proposed in this specification can be applied.
  • FIG. 17 shows an example of an operation flowchart of a terminal performing CSI reporting to which the method and / or embodiment proposed in the present specification can be applied.
  • FIG. 18 shows another example of an operation flowchart of a terminal performing CSI reporting to which the method and / or embodiment proposed in the present specification can be applied.
  • FIG. 19 shows an example of an operation flowchart of a base station receiving a CSI report to which the method and / or embodiment proposed in this specification can be applied.
  • 21 illustrates a wireless device that can be applied to the present invention.
  • FIG. 22 illustrates a signal processing circuit for a transmission signal.
  • FIG 23 shows another example of a wireless device applied to the present invention.
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • the transmitter may be part of the base station, and the receiver may be part of the terminal.
  • the transmitter may be part of the terminal, and the receiver may be part of the base station.
  • the base station may be represented by a first communication device and the terminal by a second communication device.
  • Base stations are fixed stations, Node Bs, evolved-NodeBs (eNBs), Next Generation NodeBs (gNBs), base transceiver systems (BTSs), access points (APs), networks (5G) Network), AI system, road side unit (RSU), vehicle, robot, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device have.
  • the terminal may be fixed or mobile, UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile) Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, Vehicle, Robot, AI module , Drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3GPP 3rd Generation Partnership Project
  • Long Term Evolution is part of Evolved UMTS (E-UMTS) using E-UTRA
  • LTE-A Advanced
  • LTE-A pro is an evolved version of 3GPP LTE
  • 3GPP NR New Radio or New Radio Access Technology
  • 3GPP LTE / LTE-A / LTE-A pro is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.
  • LTE means 3GPP TS 36.xxx Release 8 or later technology. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is called LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is called LTE-A pro.
  • 3GPP NR refers to the technology after TS 38.xxx Release 15.
  • LTE / NR may be referred to as a 3GPP system.
  • "xxx" means standard document detail number.
  • LTE / NR may be collectively referred to as a 3GPP system. Background art, terms, abbreviations, and the like used in the description of the present invention may refer to matters described in a standard document published prior to the present invention. For example, you can refer to the following documents.
  • RRC Radio Resource Control
  • RRC Radio Resource Control
  • NR is an expression showing an example of 5G radio access technology (RAT).
  • RAT 5G radio access technology
  • the three main requirements areas of 5G are: (1) Enhanced Mobile Broadband (eMBB) area, (2) Massive Machine Type Communication (mMTC) area, and (3) Super-reliability and Ultra-reliable and Low Latency Communications (URLLC) domain.
  • eMBB Enhanced Mobile Broadband
  • mMTC Massive Machine Type Communication
  • URLLC Ultra-reliable and Low Latency Communications
  • KPI key performance indicator
  • eMBB goes far beyond basic mobile Internet access, and covers media and entertainment applications in rich interactive work, cloud or augmented reality.
  • Data is one of the key drivers of 5G, and for the first time in the 5G era, dedicated voice services may not be seen.
  • 5G it is expected that voice will be processed as an application program simply using the data connection provided by the communication system.
  • the main causes for increased traffic volume are increased content size and increased number of applications requiring high data rates.
  • Streaming services (audio and video), interactive video and mobile internet connections will become more widely used as more devices connect to the internet. Many of these applications require always-on connectivity to push real-time information and notifications to users.
  • Cloud storage and applications are rapidly increasing in mobile communication platforms, which can be applied to both work and entertainment.
  • cloud storage is a special use case that drives the growth of uplink data transfer rate.
  • 5G is also used for remote work in the cloud, requiring much lower end-to-end delay to maintain a good user experience when a tactile interface is used.
  • Entertainment For example, cloud gaming and video streaming are another key factor in increasing demand for mobile broadband capabilities. Entertainment is essential for smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes.
  • Another use case is augmented reality and information retrieval for entertainment.
  • augmented reality requires a very low delay and an instantaneous amount of data.
  • URLLC includes new services that will transform the industry through ultra-reliable / low-latency links, such as remote control of the main infrastructure and self-driving vehicles. Reliability and level of delay are essential for smart grid control, industrial automation, robotics, drone control and coordination.
  • 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means to provide streams rated at hundreds of megabits per second to gigabit per second. This fast speed is required to deliver TV in 4K (6K, 8K and higher) resolutions as well as virtual and augmented reality.
  • Virtual Reality (VR) and Augmented Reality (AR) applications include almost immersive sports events. Certain application programs may require special network settings. For VR games, for example, game companies may need to integrate the core server with the network operator's edge network server to minimize latency.
  • Automotive is expected to be an important new driver for 5G, along with many use cases for mobile communications to vehicles. For example, entertainment for passengers requires simultaneous high capacity and high mobility mobile broadband. This is because future users continue to expect high-quality connections regardless of their location and speed.
  • Another example of application in the automotive field is the augmented reality dashboard. It identifies objects in the dark over what the driver sees through the front window, and superimposes and displays information telling the driver about the distance and movement of the object.
  • wireless modules will enable communication between vehicles, exchange of information between the vehicle and the supporting infrastructure and exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians).
  • the safety system helps the driver to reduce the risk of accidents by guiding alternative courses of action to make driving safer.
  • the next step will be remote control or a self-driven vehicle.
  • This requires very reliable and very fast communication between different self-driving vehicles and between the vehicle and the infrastructure.
  • self-driving vehicles will perform all driving activities, and drivers will focus only on traffic beyond which the vehicle itself cannot identify.
  • the technical requirements of self-driving vehicles require ultra-low delays and ultra-high-speed reliability to increase traffic safety to levels beyond human reach.
  • Smart cities and smart homes will be embedded in high-density wireless sensor networks.
  • the distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of the city or home. Similar settings can be made for each assumption.
  • Temperature sensors, window and heating controllers, burglar alarms and consumer electronics are all connected wirelessly. Many of these sensors are typically low data rates, low power and low cost. However, for example, real-time HD video may be required in certain types of devices for surveillance.
  • the smart grid interconnects these sensors using digital information and communication technologies to collect information and act accordingly. This information can include supplier and consumer behavior, so smart grids can improve efficiency, reliability, economics, production sustainability and distribution of fuels like electricity in an automated way.
  • the smart grid can be viewed as another sensor network with low latency.
  • the health sector has many applications that can benefit from mobile communications.
  • the communication system can support telemedicine that provides clinical care from a distance. This can help reduce barriers to distance and improve access to medical services that are not continuously available in remote rural areas. It is also used to save lives in critical care and emergency situations.
  • a wireless sensor network based on mobile communication can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.
  • Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing cables with wireless links that can be reconfigured is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operates with cable-like delay, reliability and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected to 5G.
  • Logistics and freight tracking are important use cases for mobile communications that enable the tracking of inventory and packages from anywhere using location-based information systems.
  • Logistics and freight tracking use cases typically require low data rates, but require wide range and reliable location information.
  • the new RAT system including NR uses an OFDM transmission scheme or a similar transmission scheme.
  • the new RAT system may follow OFDM parameters different from those of LTE.
  • the new RAT system follows the existing numerology of LTE / LTE-A, but may have a larger system bandwidth (eg, 100 MHz).
  • one cell may support a plurality of neurology. That is, terminals operating with different numerology can coexist in one cell.
  • Numerology corresponds to one subcarrier spacing in the frequency domain.
  • different numerology can be defined.
  • the eLTE eNB is an evolution of the eNB that supports connectivity to EPC and NGC.
  • gNB A node that supports NR as well as a connection with NGC.
  • New RAN A radio access network that supports NR or E-UTRA or interacts with NGC.
  • Network slice is a network defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements along with end-to-end coverage.
  • Network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.
  • NG-C Control plane interface used for the NG2 reference point between the new RAN and NGC.
  • NG-U User plane interface used for NG3 reference point between new RAN and NGC.
  • Non-standalone NR Deployment configuration where gNB requires LTE eNB as an anchor for control plane connection to EPC or eLTE eNB as an anchor for control plane connection to NGC.
  • Non-standalone E-UTRA Deployment configuration where eLTE eNB requires gNB as an anchor for control plane connection to NGC.
  • User plane gateway The endpoint of the NG-U interface.
  • FIG. 1 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.
  • the NG-RAN consists of NG-RA user planes (new AS sublayer / PDCP / RLC / MAC / PHY) and gNBs that provide control plane (RRC) protocol termination for UE (User Equipment). do.
  • NG-RA user planes new AS sublayer / PDCP / RLC / MAC / PHY
  • RRC control plane
  • the gNBs are interconnected via X n interfaces.
  • the gNB is also connected to the NGC through the NG interface.
  • the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and a User Plane Function (UPF) through an N3 interface.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • the numerology may be defined by subcarrier spacing and CP (Cyclic Prefix) overhead.
  • CP Cyclic Prefix
  • a plurality of subcarrier intervals is the default subcarrier interval N (or, ) Can be derived by scaling.
  • the numerology used can be selected independently of the frequency band.
  • OFDM orthogonal frequency division multiplexing
  • OFDM neurology supported in the NR system may be defined as shown in Table 1.
  • Downlink (downlink) and uplink (uplink) transmission is It consists of a radio frame (radio frame) having a section of.
  • each radio frame is It consists of 10 subframes (subframes) having an interval of. In this case, there may be one set of frames for uplink and one set of frames for downlink.
  • FIG. 2 shows a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in this specification can be applied.
  • transmission of an uplink frame number i from a user equipment (UE) is greater than the start of a corresponding downlink frame at the corresponding terminal. You have to start earlier.
  • New Merology For, slots are within a subframe Numbered in increasing order, within the radio frame It is numbered in increasing order.
  • Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols in a downlink slot or an uplink slot cannot be used.
  • Table 2 shows the number of OFDM symbols per slot in a normal CP ( ), The number of slots per radio frame ( ), Number of slots per subframe ( Table 3 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.
  • 3 shows an example of a frame structure in an NR system. 3 is for convenience of description only and does not limit the scope of the present invention.
  • one subframe may include four slots.
  • a mini-slot may consist of 2, 4 or 7 symbols, or more or less symbols.
  • an antenna port a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.
  • the antenna port is defined such that the channel on which the symbol on the antenna port is carried can be deduced from the channel on which the other symbol on the same antenna port is carried.
  • the two antenna ports are QC / QCL (quasi co-located or quasi co-location).
  • the wide-scale characteristics include one or more of delay spread, doppler spread, frequency shift, average received power, and received timing.
  • 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.
  • the resource grid is on the frequency domain Consists of subcarriers, one subframe It is exemplarily described that consists of OFDM symbols, but is not limited thereto.
  • the transmitted signal is One or more resource grids consisting of subcarriers and It is described by the OFDM symbols of. From here, to be. remind Denotes a maximum transmission bandwidth, which may vary between uplink and downlink as well as numerology.
  • the numerology And one resource grid for each antenna port p.
  • FIG. 5 shows examples of an antenna port and a resource grid for each neurology to which the method proposed in this specification can be applied.
  • each element of the resource grid for the antenna port p is referred to as a resource element, an index pair It is uniquely identified by. From here, Is an index on the frequency domain, Indicates the position of the symbol in the subframe. When referring to a resource element in a slot, an index pair Is used. From here, to be.
  • New Merology And resource elements for antenna port p Is the complex value Corresponds to If there is no risk of confusion, or if a specific antenna port or numerology is not specified, the indexes p and Can be dropped, resulting in a complex value or Can be
  • a physical resource block (physical resource block) on the frequency domain It is defined as consecutive subcarriers.
  • Point A serves as a common reference point of the resource block grid and can be obtained as follows.
  • -OffsetToPointA for PCell downlink indicates the frequency offset between the lowest sub-carrier and point A of the lowest resource block overlapping the SS / PBCH block used by the UE for initial cell selection, 15 kHz subcarrier spacing for FR1 and Expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;
  • -absoluteFrequencyPointA represents the frequency-position of point A expressed as in an absolute radio-frequency channel number (ARFCN).
  • Common resource blocks set the subcarrier interval It is numbered upward from 0 in the frequency domain for.
  • Subcarrier spacing setting The center of subcarrier 0 of the common resource block 0 for 'point A' coincides with 'point A'.
  • Common resource block number in frequency domain And subcarrier spacing settings The resource element (k, l) for can be given as in Equation 1 below.
  • the It can be defined relative to point A to correspond to a subcarrier centered on point A.
  • Physical resource blocks start from 0 within a bandwidth part (BWP). Numbered up to, Is the number of the BWP. Physical resource block in BWP i And common resource blocks The relationship between can be given by Equation 2 below.
  • a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station.
  • the information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.
  • the terminal performs an initial cell search operation such as synchronizing with the base station when the power is turned on or newly enters the cell (S601).
  • the terminal may receive a primary synchronization signal (Primary Synchronization Signal, PSS) and a secondary synchronization signal (Secondary Synchronization Signal, SSS) from the base station to synchronize with the base station and obtain information such as cell ID.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain intra-cell broadcast information.
  • PBCH physical broadcast channel
  • the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE obtains more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH. It can be done (S602).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the terminal may perform a random access procedure (Random Access Procedure, RACH) to the base station (S603 to S606).
  • RACH Random Access Procedure
  • the UE transmits a specific sequence as a preamble through a physical random access channel (PRACH) (S603 and S605), and a response message for the preamble through a PDCCH and a corresponding PDSCH ((Random Access (RAR) Response) message)
  • PRACH physical random access channel
  • RAR Random Access
  • a contention resolution procedure may be additionally performed (S606).
  • the UE that has performed the above-described procedure is a general uplink / downlink signal transmission procedure, and then receives PDCCH / PDSCH (S607) and physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink). Control Channel (PUCCH) transmission (S608) may be performed.
  • the terminal may receive downlink control information (DCI) through the PDCCH.
  • DCI downlink control information
  • the DCI includes control information such as resource allocation information for the terminal, and formats may be differently applied according to purpose of use.
  • control information that the UE transmits to the base station through the uplink or that the UE receives 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.
  • the UE may transmit the control information such as CQI / PMI / RI described above through PUSCH and / or PUCCH.
  • the BM procedure sets a set of base station (eg, gNB, TRP, etc.) and / or terminal (eg, UE) beams that can be used for downlink (DL) and uplink (UL) transmission / reception.
  • Beam measurement an operation of measuring a characteristic of a beamforming signal received by a base station or a UE.
  • Tx beam transmission beam
  • Rx beam reception beam
  • Beam sweeping The operation of covering a spatial area using a transmitting and / or receiving beam for a predetermined time interval in a predetermined manner.
  • Beam report the UE reports the information of the beam-formed signal based on the beam measurement.
  • the BM procedure can be classified into (1) a DL BM procedure using a synchronization signal (SS) / physical broadcast channel (PBCH) block or CSI-RS, and (2) a UL BM procedure using a sounding reference signal (SRS).
  • each BM procedure may include Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.
  • the downlink beam management procedure includes: (1) a base station transmitting a beam forming DL RS (eg, CSI-RS or SS block (SSB)) and (2) a terminal transmitting a beam report. It may include steps.
  • a base station transmitting a beam forming DL RS eg, CSI-RS or SS block (SSB)
  • SSB SS block
  • the beam reporting may include a preferred DL RS ID (identifier) (s) and the corresponding L1-RSRP.
  • DL RS ID may be SSB resource indicator (SSBRI) or CSI-RS resource indicator (CRI).
  • SSBRI SSB resource indicator
  • CRI CSI-RS resource indicator
  • FIG. 7 shows an example of beam forming using SSB and CSI-RS.
  • the SSB beam and the CSI-RS beam can be used for beam measurement.
  • the measurement metric is L1-RSRP for each resource / block.
  • SSB is used for coarse beam measurement, and CSI-RS can be used for fine beam measurement.
  • SSB can be used for both Tx beam sweeping and Rx beam sweeping.
  • Rx beam sweeping using SSB may be performed while the UE changes the Rx beam for the same SSBRI across multiple SSB bursts.
  • one SS burst includes one or more SSBs
  • one SS burst set includes one or more SSB bursts.
  • FIG. 8 is a flowchart showing an example of a DL BM procedure using SSB.
  • the setting for the beam report using the SSB is performed during CSI / beam configuration in the RRC connected state (or RRC connected mode).
  • the terminal receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList including SSB resources used for BM from the base station (S810).
  • Table 4 shows an example of CSI-ResourceConfig IE. As shown in Table 4, BM configuration using SSB is not separately defined, and SSB is set as CSI-RS resource.
  • the csi-SSB-ResourceSetList parameter indicates a list of SSB resources used for beam management and reporting in one resource set.
  • the SSB resource set may be set as ⁇ SSBx1, SSBx2, SSBx3, SSBx4, ... ⁇ .
  • SSB index can be defined from 0 to 63.
  • the terminal receives the SSB resource from the base station based on the CSI-SSB-ResourceSetList (S820).
  • the terminal reports (beam) the best SSBRI and the corresponding L1-RSRP to the base station (S830).
  • the terminal reports the best SSBRI and the corresponding L1-RSRP to the base station.
  • the UE has the CSI-RS and SSB 'QCL-TypeD' From the point of view, it can be assumed to be quasi co-located.
  • the QCL TypeD may mean that QCL is performed between antenna ports in terms of spatial Rx parameters.
  • the same reception beam may be applied.
  • the terminal does not expect CSI-RS to be set in the RE overlapping the RE of the SSB.
  • At least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is the same downlink spatial domain transmission filter It can be assumed that the transmission is performed.
  • At least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same Tx beam.
  • At least one CSI-RS resource in the NZP-CSI-RS-ResourceSet may be transmitted through different OFDM symbols or may be transmitted in different frequency domains (ie, through FDM).
  • repetition when repetition is set to "ON", it is related to the Rx beam sweeping procedure of the terminal.
  • the terminal does not expect to receive a different periodicity in periodicityAndOffset from all CSI-RS resources in the NZP-CSI-RS-ResourceSet.
  • the terminal when repetition is set to "OFF", the terminal does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted with the same downlink spatial domain transmission filter.
  • At least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through another TX bam.
  • repetition When repetition is set to "OFF", it is related to the transmission beam sweeping procedure of the base station.
  • parameter repetition can be set only for a CSI-RS resource set associated with L1 RSRP or CSI-ReportConfig having "No report or None".
  • the terminal When the terminal receives CSI-ResourceConfig with reportQuantity set to "cri-RSRP" or "none", the terminal can be configured with the same number of ports (1-port or 2-port), and NZP-CSI-RS- Define the "nrofPorts" parameter for all CSI-RS resources in the ResourceSet.
  • CSI-RS if parameter repetition is set in a specific CSI-RS resource set and TRS_info is not set, CSI-RS is used for beam management.
  • CSI-RS is used as a tracking reference signal (TRS).
  • CSI-RS is used for CSI acquisition.
  • FIG. 9 is a diagram illustrating an example of a DL BM procedure using CSI-RS.
  • FIG. 9 (a) shows an Rx beam determination (or refinement) procedure of the terminal
  • FIG. 9 (b) shows a transmission beam determination procedure of the base station.
  • FIG. 9 (a) is a case where parameter repetition is set to “on”
  • FIG. 9 (b) is a case where it is set to “OFF”.
  • FIG. 10 is a diagram for explaining a procedure for determining a received beam in a downlink beam management procedure using CSI-RS.
  • the UE receives an NZP CSI-RS resource set IE including upper layer parameter repetition through RRC signaling from the base station (S1010).
  • the parameter repeat is set to "ON".
  • the UE repeatedly receives CSI resources in a CSI-RS resource set in which repetition is set to “ON” from other OFDM symbols through the same Tx beam (or DL spatial domain transmission filter) (S1020).
  • the terminal determines its own reception beam (S1030).
  • the UE may omit the CSI report or transmit a CSI report including CRI / L1-RSRP to the base station (S1040).
  • the reportQuantity of the CSI report Config may be configured as "No report (or None)" or "CRI and L1-RSRP".
  • the UE may skip the CSI report or report the ID information (CRI) of the priority beam related to the beam pair and its quality value (L1-RSRP).
  • CRI ID information
  • L1-RSRP quality value
  • 11 is a flowchart illustrating an example of a transmission beam determination procedure of a base station.
  • the UE receives the NZP CSI-RS resource set IE including upper layer parameter repetition through RRC signaling from the base station (S1110).
  • the parameter repetition is set to "OFF" and is related to the Tx beam sweeping procedure of the base station.
  • the UE receives the CSI resource from the CSI-RS resource set in which repetition is set to “OFF” through another Tx beam (DL spatial domain transmission filter) (S1120).
  • Tx beam DL spatial domain transmission filter
  • the UE selects (or determines) the optimal beam (S1130), and reports the ID and quality information (eg, L1-RSRP) of the selected beam to the base station (S1140).
  • ID and quality information eg, L1-RSRP
  • the reportQuantity of CSI report Config may be configured as "CRI + L1-RSRP". That is, when the CSI-RS is transmitted for the BM, the UE reports the corresponding CSI and L1-RSRP to the base station.
  • FIG. 12 is a diagram illustrating an example of resource allocation in a time and frequency domain related to the operation of FIG. 9.
  • repetition when repetition is set to “ON” for a CSI-RS resource set, a plurality of CSI-RS resources are repeatedly used through the same Tx beam.
  • repetition for CSI-RS is set to "OFF”, different CSI-RS resources are transmitted through different transmission beams.
  • the UE may receive a list of up to M candidate transmission configuration indication (TCI) states RRC.
  • TCI transmission configuration indication
  • M may be 64.
  • Each TCI state can be set to one RS set.
  • each ID of the DL RS for spatial QCL purpose (QCL Type D) in the RS set may refer to one of DL RS types such as SSB, P-CSI RS, SP-CSI RS, and A-CSI RS. .
  • Initialization / update of the DL RS (s) ID in the RS set used for spatial QCL purposes at least can be performed through at least explicit signaling.
  • Table 5 shows an example of TCI-State IE.
  • TCI-State IE associates one or two DL reference signal (RS) corresponding quasi co-location (QCL) types.
  • RS DL reference signal
  • QCL quasi co-location
  • the bwp-Id parameter indicates the DL BWP in which the RS is located
  • the cell parameter indicates the carrier in which the RS is located
  • the referencesignal parameter is a reference that is a source of quasi co-location for the target antenna port (s). It indicates antenna port (s) or a reference signal including the same.
  • the target antenna port (s) may be CSI-RS, PDCCH DMRS, or PDSCH DMRS.
  • a corresponding TCI state ID may be indicated in NZP CSI-RS resource configuration information.
  • TCI state ID may be indicated in each CORESET setting to indicate QCL reference information for the PDCCH DMRS antenna port (s).
  • the TCI state ID may be indicated through DCI to indicate QCL reference information for the PDSCH DMRS antenna port (s).
  • the antenna port is defined such that a channel carrying a symbol on the antenna port can be inferred from a channel carrying another symbol on the same antenna port. If the property of a channel carrying a symbol on one antenna port can be inferred from a channel carrying a symbol on another antenna port, the two antenna ports are QC / QCL (quasi co-located or quasi co-location) ) Can be said to be in a relationship.
  • the channel characteristics include delay spread, Doppler spread, frequency / Doppler shift, average received power, received timing / average delay (Received Timing / average) delay), one or more of Spatial RX parameters.
  • the Spatial Rx parameter means a spatial (reception) channel characteristic parameter such as angle of arrival.
  • the UE may be set to a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config to decode the PDSCH according to the detected PDCCH having the DCI intended for the UE and a given serving cell.
  • the M depends on UE capability.
  • Each TCI-State includes parameters for establishing a quasi co-location relationship between one or two DL reference signals and the DM-RS port of the PDSCH.
  • the quasi co-location relationship is set to a higher layer parameter qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS (if set).
  • the QCL type is not the same regardless of whether the reference is the same DL RS or different DL RSs.
  • the quasi co-location type corresponding to each DL RS is given by the higher layer parameter qcl-Type of QCL-Info, and can take one of the following values:
  • the corresponding NZP CSI-RS antenna ports may be indicated / set as a specific TRS in the QCL-Type A perspective and a specific SSB and QCL in the QCL-Type D perspective. have.
  • the UE receiving this instruction / setting receives the corresponding NZP CSI-RS using the Doppler and delay values measured in the QCL-TypeA TRS, and applies the received beam used for QCL-TypeD SSB reception to the corresponding NZP CSI-RS reception. can do.
  • the UE may receive an activation command by MAC CE signaling used to map up to 8 TCI states to the codepoint of the DCI field 'Transmission Configuration Indication'.
  • the UL BM may or may not establish beam reciprocity (or beam correspondence) between Tx beams and Rx beams depending on the UE implementation. If the reciprocity between Tx beam and Rx beam is established at both the base station and the UE, the UL beam pair can be matched through the DL beam pair. However, if reciprocity between Tx beam and Rx beam is not established in either of the base station and the UE, a UL beam pair determination process is required separately from DL beam pair determination.
  • the base station can use the UL BM procedure for DL Tx beam determination without the terminal requesting to report a preferred beam.
  • UL BM may be performed through beamformed UL SRS transmission, and whether to apply UL BM of the SRS resource set is set by (higher layer parameter) usage.
  • usage is set to 'BeamManagement (BM)', only one SRS resource can be transmitted to each of a plurality of SRS resource sets at a given time instant.
  • BM BeamManagement
  • the UE may be configured with one or more Sounding Reference Symbol (SRS) resource sets (via higher layer signaling, RRC signaling) set by the (higher layer parameter) SRS-ResourceSet.
  • SRS Sounding Reference Symbol
  • the UE may set K ⁇ 1 SRS resources (higher later parameter SRS-resource).
  • K is a natural number, and the maximum value of K is indicated by SRS_capability.
  • the UL BM procedure may be divided into Tx beam sweeping of the UE and Rx beam sweeping of the base station.
  • FIG. 13 shows an example of a UL BM procedure using SRS.
  • FIG. 13 (a) shows the Rx beam determination procedure of the base station
  • FIG. 13 (b) shows the Tx beam sweeping procedure of the terminal.
  • FIG. 14 is a flowchart illustrating an example of a UL BM procedure using SRS.
  • the terminal receives RRC signaling (eg, SRS-Config IE) including a usage parameter set to 'beam management' (higher layer parameter) from the base station (S1410).
  • RRC signaling eg, SRS-Config IE
  • SRS-Config IE a usage parameter set to 'beam management' (higher layer parameter) from the base station (S1410).
  • SRS-Config IE Information Element
  • SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets.
  • Each SRS resource set means a set of SRS-resources.
  • the network may trigger transmission of the SRS resource set using the set aperiodicSRS-ResourceTrigger (L1 DCI).
  • usage indicates a higher layer parameter indicating whether the SRS resource set is used for beam management or codebook-based or non-codebook-based transmission.
  • the usage parameter corresponds to the L1 parameter 'SRS-SetUse'.
  • 'spatialRelationInfo' is a parameter indicating the setting of spatial relation between reference RS and target SRS.
  • the reference RS may be SSB, CSI-RS or SRS corresponding to the L1 parameter 'SRS-SpatialRelationInfo'.
  • the usage is set for each SRS resource set.
  • the terminal determines the Tx beam for the SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S1420).
  • the SRS-SpatialRelation Info is set for each SRS resource, and indicates whether to apply the same beam as used in SSB, CSI-RS or SRS for each SRS resource.
  • SRS-SpatialRelationInfo may or may not be set in each SRS resource.
  • SRS-SpatialRelationInfo is set in SRS resource, the same beam as that used in SSB, CSI-RS or SRS is applied and transmitted. However, if SRS-SpatialRelationInfo is not set in the SRS resource, the UE randomly determines the Tx beam and transmits the SRS through the determined Tx beam (S1430).
  • the UE applies the spatial domain transmission filter identical to (or generated from the corresponding filter) spatial domain Rx filter used for reception of the SSB / PBCH to apply the corresponding SRS resource.
  • the spatial domain transmission filter identical to (or generated from the corresponding filter) spatial domain Rx filter used for reception of the SSB / PBCH to apply the corresponding SRS resource.
  • the UE transmits SRS resources by applying the same spatial domain transmission filter used for reception of periodic CSI-RS or SP CSI-RS; or
  • the UE transmits the corresponding SRS resource by applying the same spatial domain transmission filter used for transmission of periodic SRS.
  • a beam determination and transmission operation may be applied similarly to the above.
  • the terminal may or may not receive feedback to the SRS from the base station as in the following three cases (S1440).
  • the UE transmits the SRS in a beam indicated by the base station.
  • the base station corresponds to Fig. 13 (a) for the purpose of selecting the Rx beam.
  • Spatial_Relation_Info may not be set for all SRS resources in the SRS resource set.
  • the terminal can freely transmit while changing the SRS beam. That is, in this case, the terminal is used for sweeping the Tx beam, and corresponds to FIG. 13 (b).
  • Spatial_Relation_Info can be set only for some SRS resources in the SRS resource set.
  • the SRS resource for the set SRS resource is transmitted by the indicated beam, and the SRS resource for which Spatial_Relation_Info is not set may be arbitrarily transmitted by the UE by applying the Tx beam.
  • CSI-RS channel state information-reference signal
  • time and / or frequency tracking time / frequency tracking
  • CSI calculation L1 (layer 1) -RSRP (reference signal received) power) used for computation and mobility.
  • L1-RSRP computation is related to CSI acquisition
  • L1-RSRP computation is related to beam management (BM).
  • CSI channel state information
  • CSI channel state information
  • 15 is a flowchart illustrating an example of a CSI-related procedure.
  • a terminal eg, user equipment, UE transmits configuration information related to CSI through radio resource control (RRC) signaling to a base station (eg: general Node B, gNB) (S1510).
  • RRC radio resource control
  • the configuration information related to the CSI includes CSI-IM (interference management) resource related information, CSI measurement configuration related information, CSI resource configuration related information, and CSI-RS resource related information. Or, it may include at least one of CSI report configuration (report configuration) related information.
  • CSI-IM resource-related information may include CSI-IM resource information, CSI-IM resource set information, and the like.
  • the CSI-IM resource set is identified by a CSI-IM resource set ID (identifier), and one resource set includes at least one CSI-IM resource.
  • Each CSI-IM resource is identified by a CSI-IM resource ID.
  • Information related to CSI resource configuration may be expressed by CSI-ResourceConfig IE.
  • Information related to CSI resource configuration defines a group including at least one of a non-zero power (NZP) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resource set. That is, the CSI resource configuration related information includes a CSI-RS resource set list, and the CSI-RS resource set list 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 can contain one.
  • the CSI-RS resource set is identified by the CSI-RS resource set ID, and one resource set includes at least one CSI-RS resource. Each CSI-RS resource is identified by a CSI-RS resource ID.
  • Table 7 shows an example of the NZP CSI-RS resource set IE.
  • parameters indicating the use of CSI-RS for each NZP CSI-RS resource set eg, a 'repetition' parameter related to BM and a 'trs-Info' parameter related to tracking
  • a 'repetition' parameter related to BM and a 'trs-Info' parameter related to tracking may be set.
  • the repetition parameter corresponding to the higher layer parameter corresponds to 'CSI-RS-ResourceRep' of the L1 parameter.
  • the CSI report configuration related information includes a reportConfigType parameter indicating time domain behavior and a reportQuantity parameter indicating a CSI related quantity for reporting.
  • the time domain behavior may be periodic, aperiodic or semi-persistent.
  • CSI-ReportConfig IE Information related to CSI report configuration may be expressed as CSI-ReportConfig IE, and Table 8 below shows an example of CSI-ReportConfig IE.
  • the terminal measures the CSI based on the configuration information related to the CSI (S1520).
  • the CSI measurement may include (1) a CSI-RS reception process of the terminal (S1521), and (2) a process of calculating CSI through the received CSI-RS (S1522). Will be described later.
  • RE (resource element) mapping of CSI-RS resources is set in a time and frequency domain by a higher layer parameter CSI-RS-ResourceMapping.
  • Table 9 shows an example of CSI-RS-ResourceMapping IE.
  • density represents the density of CSI-RS resources measured in RE / port / PRB (physical resource block), and nrofPorts represents the number of antenna ports.
  • the UE reports the measured CSI to the base station (S1530).
  • the terminal may omit the report.
  • the terminal may report to the base station.
  • the quantity is set to 'none', it is a case of triggering an aperiodic TRS or a case of repetition.
  • the report of the terminal can be omitted only when repetition is set to 'ON'.
  • the UE may calculate the CSI parameters assuming the following dependency between CSI parameters.
  • LI can be calculated on the condition of reported CQI, PMI, RI and CRI.
  • CQI can be calculated subject to reported PMI, RI and CRI.
  • PMI can be calculated on the basis of reported RI and CRI.
  • RI can be calculated subject to a reported CRI.
  • Reporting configuration for CSI is aperiodic (using PUSCH), periodic (using PUCCH), or semi-persistent (PUCCH, and DCI activated PUSCH) It can be).
  • CSI-RS resources may be periodic, semi-permanent, or aperiodic.
  • Table 10 shows the supported combination of CSI reporting configuration and CSI-RS resource configuration and how CSI reporting is triggered by each CSI-RS resource configuration.
  • Periodic CSI-RS may be set by a higher layer.
  • the semi-persistent CSI-RS can be activated and deactivated.
  • Aperiodic CSI-RS may be triggered / activated.
  • the UE can determine the CRI among the supported sets of CRI values, and in each CRI report You can report the number.
  • CRI may not be reported.
  • CRI reporting may not be reported when the upper layer parameter codebookType is set to 'typeII' or 'typeII-PortSelection'.
  • period (measured in slots) may be set by a higher layer parameter reportSlotConfig.
  • the allowed slot offsets may be set by a higher layer parameter reportSlotOffsetList.
  • the offset can be selected in activating / triggering DCI.
  • the UE may be configured through higher layer signaling of one of two possible subband sizes.
  • the subband It can be defined as consecutive PRBs, and the total number of PRBs in the BWP can be determined according to Table 11.
  • ReportFreqConfiguration included in CSI-ReportConfig indicates frequency granularity of CSI reporting.
  • CSI reporting setting configuration (CSI reporting setting configuration) may be defined as a CSI reporting band as a subset of BWP subbands, and reportFreqConfiguration may indicate the following:
  • the csi-ReportingBand indicates a contiguous or non-contiguous subset of subbands in the BWP where the CSI will be reported.
  • the UE does not expect to be set as a CSI reporting band including subbands in which a reference signal and interference for a channel do not exist.
  • wideband CQI reporting it may be set by a higher layer parameter cqi-FormatIndicator.
  • wideband CQI reporting wideband CQI may be reported for each codeword for the entire CSI reporting band.
  • subband CQI reporting one CQI for each codeword may be reported for each subband in the CSI reporting band.
  • -For wideband PMI or subband PMI reporting it may be set by a higher layer parameter pmi-FormatIndicator.
  • wideband PMI reporting the wideband PMI can be reported for the entire CSI reporting band.
  • subband PMI reporting a single wideband indication (i1) can be reported for the entire CSI reporting band, except for the 2 antenna ports, and one subband indication (i2) is It may be reported for each subband of the CSI reporting band.
  • the subband PMIs are configured with 2 antenna ports, the PMI may be reported for each subband of the CSI reporting band.
  • CSI Reporting Setting can be said to have wide band frequency-granularity in the following cases.
  • -reportQuantity is set to 'cri-RI-PMI-CQI' or 'cri-RI-LI-PMI-CQI', cqi-FormatIndicator indicates a single CQI report, and pmi-FormatIndicator reports a single PMI report If instructed, or
  • -if reportQuantity is set to 'cri-RI-CQI' or 'cri-RI-i1-CQI', and cqi-FormatIndicator indicates a single CQI reporting, or
  • the CSI Reporting Setting has a subband frequency-granularity.
  • the NR system supports more flexible and dynamic CSI measurement and reporting.
  • the CSI measurement may include a procedure for receiving CSI-RS and computing the received CSI-RS to acquire CSI.
  • CM semi-persistent / periodic channel measurement
  • IM interference measurement
  • NR's CSI-IM based IMR has a design similar to LTE's CSI-IM, and is set independently from ZP CSI-RS resources for PDSCH rate matching. And, in NZP CSI-RS based IMR, each port emulates an interference layer with (preferred channel) and precoded NZP CSI-RS. This is for intra-cell interference measurement for a multi-user case and mainly targets MU interference.
  • the base station transmits the precoded NZP CSI-RS to the terminal on each port of the configured NZP CSI-RS based IMR.
  • the UE assumes a channel / interference layer for each port in the resource set and measures interference.
  • the base station or network indicates a subset of NZP CSI-RS resources for channel / interference measurement through DCI.
  • Each CSI resource setting 'CSI-ResourceConfig' includes the configuration for S ⁇ 1 CSI resource set (given by the higher layer parameter csi-RS-ResourceSetList).
  • the CSI resource setting corresponds to the CSI-RS- resourcesetlist.
  • S represents the number of set CSI-RS resource sets.
  • the configuration for the S ⁇ 1 CSI resource set is the SS / PBCH block (SSB) used for each CSI resource set and L1-RSRP computation including CSI-RS resources (consisting of NZP CSI-RS or CSI-IM). ) resource.
  • SSB SS / PBCH block
  • Each CSI resource setting is located in a DL BWP (bandwidth part) identified by a higher layer parameter bwp-id. And, all CSI resource settings linked to the CSI reporting settings have the same DL BWP.
  • the time domain behavior of the CSI-RS resource is indicated by a higher layer parameter resourceType, and may be set to aperiodic, periodic, or semi-persistent.
  • resourceType the number (S) of the set CSI-RS resource set is limited to '1'.
  • the set period and slot offset are given in the numerology of the associated DL BWP, as given by bwp-id.
  • the same time domain behavior is configured for CSI-ResourceConfig.
  • the same time domain behavior is set for the CSI-ResourceConfig.
  • CM channel measurement
  • IM interference measurement
  • a channel measurement resource may be NZP CSI-RS for CSI acquisition
  • an interference measurement resource may be NZP CSI-RS for CSI-IM and IM.
  • CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.
  • NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multi-user.
  • the UE may assume that CSI-RS resource (s) for channel measurement and CSI-IM / NZP CSI-RS resource (s) for interference measurement set for one CSI reporting are 'QCL-TypeD' for each resource. .
  • the resource setting can mean a resource set list.
  • each trigger state set using the higher layer parameter CSI-AperiodicTriggerState includes one or more CSI-ReportConfigs with each CSI-ReportConfig linked to a periodic, semi-persistent or aperiodic resource setting.
  • One reporting setting can be associated with up to three resource settings.
  • the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is for channel measurement for L1-RSRP computation.
  • the first resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is for channel measurement, and the second resource (given by csi-IM-ResourcesForInterference or nzp-CSI-RS -ResourcesForInterference)
  • the setting is for interference measurement performed on CSI-IM or NZP CSI-RS.
  • the first resource setting (given by resourcesForChannelMeasurement) is for channel measurement
  • the second resource setting (given by csi-IM-ResourcesForInterference) is for CSI-IM based interference measurement.
  • the third resource setting (given by nzp-CSI-RS-ResourcesForInterference) is for NZP CSI-RS based interference measurement.
  • each CSI-ReportConfig is linked to a periodic or semi-persistent resource setting.
  • the resource setting is for channel measurement for L1-RSRP computation.
  • the first resource setting (given by resourcesForChannelMeasurement) is for channel measurement
  • the second resource setting (given by higher layer parameter csi-IM-ResourcesForInterference) is performed on CSI-IM It is used for interference measurement.
  • each CSI-RS resource for channel measurement is associated with each CSI-IM resource and resource according to the order of CSI-RS resources and CSI-IM resources within a corresponding resource set. .
  • the number of CSI-RS resources for channel measurement is the same as the number of CSI-IM resources.
  • UE when the interference measurement is performed in the NZP CSI-RS, UE does not expect to be set to one or more NZP CSI-RS resource in the associated resource set within the resource setting for channel measurement.
  • the UE with the Higher layer parameter nzp-CSI-RS-ResourcesForInterference set does not expect more than 18 NZP CSI-RS ports to be set in the NZP CSI-RS resource set.
  • the terminal assumes the following.
  • Each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer.
  • time and frequency resources available to the UE are controlled by the base station.
  • Channel state information includes channel quality indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SS / PBCH block resource indicator (SSBRI), layer It may include at least one of indicator (LI), rank indicator (RI) or L1-RSRP.
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • CRI CSI-RS resource indicator
  • SSBRI SS / PBCH block resource indicator
  • layer It may include at least one of indicator (LI), rank indicator (RI) or L1-RSRP.
  • the terminal For CQI, PMI, CRI, SSBRI, LI, RI, L1-RSRP, the terminal is N ⁇ 1 CSI-ReportConfig reporting setting, M ⁇ 1 CSI-ResourceConfig resource setting and a list of one or two trigger states (aperiodicTriggerStateList and semiPersistentOnPUSCH -Provided by TriggerStateList).
  • Each trigger state in the aperiodicTriggerStateList includes a list of associated CSI-ReportConfigs indicating resource set IDs for a channel and optionally interference.
  • each trigger state includes one associated CSI-ReportConfig.
  • time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic.
  • Periodic CSI reporting is performed on short PUCCH and long PUCCH.
  • Periodic CSI reporting period (periodicity) and slot offset (slot offset) may be set to RRC, see CSI-ReportConfig IE.
  • SP sin-periodic CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH.
  • SP CSI on PUSCH periodicity of SP CSI reporting is set to RRC, but slot offset is not set to RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1).
  • DCI format 0_1
  • SP-CSI C-RNTI SP-CSI C-RNTI
  • the initial CSI reporting timing follows the PUSCH time domain allocation value indicated in DCI, and the subsequent CSI reporting timing follows a period set by RRC.
  • DCI format 0_1 includes a CSI request field, and may activate / deactivation a specific configured SP-CSI trigger state.
  • SP CSI reporting has the same or similar activation / deactivation as the mechanism with data transmission on the SPS PUSCH.
  • aperiodic CSI reporting is performed on PUSCH and triggered by DCI.
  • information related to a trigger of aperiodic CSI reporting may be delivered / instructed / set through MAC-CE.
  • AP CSI-RS timing is set by RRC, and timing for AP CSI reporting is dynamically controlled by DCI.
  • NR In NR, a method of dividing and reporting CSI in multiple reporting instances that have been applied to PUCCH-based CSI reporting in LTE (eg, transmission in the order of RI, WB PMI / CQI, SB PMI / CQI) is not applied. Instead, NR restricts a specific CSI report from being set in a short / long PUCCH, and a CSI omission rule is defined. And, with respect to AP CSI reporting timing, PUSCH symbol / slot location is dynamically indicated by DCI. And, candidate slot offsets are set by RRC. For CSI reporting, slot offset (Y) is set for each reporting setting. For UL-SCH, slot offset K2 is set separately.
  • the two CSI latency classes are defined in terms of CSI computational complexity.
  • low latency CSI it is WB CSI including up to 4 ports Type-I codebook or up to 4-ports non-PMI feedback CSI.
  • High latency CSI refers to CSI other than low latency CSI.
  • Z, Z ' is defined in units of OFDM symbols.
  • Z denotes the minimum CSI processing time until the CSI report is performed after receiving the Aperiodic CSI triggering DCI.
  • Z ' represents the minimum CSI processing time until CSI reporting is performed after receiving CSI-RS for channel / interference.
  • the terminal reports the number of CSIs that can be simultaneously calculated.
  • the CoMP Coordinated Multi Point
  • channel information e.g., RI / CQI / PMI / LI, etc.
  • JT Joint transmission
  • CS Coordinated scheduling
  • CB Coordinated beamforming
  • DPS dynamic point selection
  • DPB dynamic point blacking
  • a UE When a user equipment (UE) reports channel state information (CSI) for a downlink (DL) channel to a base station, a UE includes a channel direction information and a channel quality information (feedback). )can do. For example, the terminal may select a RI (Rank Indicator) and a PMI (Precoding Matrix Indicator) from a predetermined codebook and report it to the base station as channel direction information. In addition, when receiving data using the selected RI and PMI, a channel quality indicator (CQI) of an achievable channel may be reported as channel quality information.
  • RI Rank Indicator
  • PMI Precoding Matrix Indicator
  • CQI channel quality indicator
  • LC codebook In the NR (New RAT) system, a high resolution codebook may be supported, which is referred to as a type2 codebook.
  • type2 codebook In addition, since various DFT beam vectors are linearly combined (LC) to indicate the channel direction, this is also referred to as a linear combination (LC) codebook (hereinafter referred to as LC codebook).
  • channel quality information with a small payload size (eg, CQI) is transmitted periodically or semi-persistent, but channel direction information with a large payload size (eg, PMI / RI) ) May consider a method of transmitting aperiodicly.
  • the UE may consider a method of feedback whether it is necessary to update channel direction information (eg, PMI / RI) in addition to channel quality information (eg, CQI). Accordingly, the base station may determine whether to trigger reporting of channel direction information (eg, PMI / RI).
  • channel direction information eg, PMI / RI
  • CQI channel quality information
  • the channel state information based on an LC codebook as an example of a high resolution codebook will be described.
  • this is only for convenience of description and does not limit the scope of the present invention. Therefore, in addition to the LC codebook, the channel state information based on an arbitrary high resolution codebook (that is, CSI capable of accurate channel direction and quality expression using many payloads) can be extendedly applied.
  • CSI feedback may be classified according to CSI parameters (eg, PMI, RI, CQI, etc.) included in the CSI reported to the base station.
  • CSI parameters eg, PMI, RI, CQI, etc.
  • CSI feedback including channel direction information eg, PMI / RI
  • CSI feedback not including channel direction information eg, PMI / RI
  • CSI1 and CSI2 is for convenience of description only, and does not limit the technical scope of the present invention.
  • 16 shows an example in which cyclic or semi-periodic CSI feedback and aperiodic CSI feedback are performed in a time slot.
  • slots 0/35 indicate aperiodic CSI feedback based on the trigger of the base station
  • slots 10/20/30/40/50 indicate periodic or semi-persistent CSI feedback.
  • CSI reporting is performed based on FIG. 16.
  • this is only for convenience of description and does not limit the technical scope of the present invention. Therefore, it is obvious that the time slot in which CSI reporting is performed can be changed.
  • CSI feedback including channel direction information eg, PMI / RI
  • channel direction information eg, PMI / RI
  • channel direction information eg, PMI / RI
  • CSI2 may consider a method of transmitting periodically or semi-permanently.
  • the UE may report RI / PMI / CQI through aperiodic CSI feedback (eg, CSI1).
  • aperiodic CSI feedback eg, CSI1
  • PUSCH Physical Uplink Shared Channel
  • the UE may report CQI through periodic or semi-persistent CSI feedback (eg, CSI2).
  • the channel quality information (eg, CQI) that can be achieved is periodically or semi-permanently CSI. It can be transmitted to the base station (eg, CSI2).
  • the UE may update the PMI / RI based on the recently measured channel, and transmit channel quality information (eg, CQIopt) that can be achieved when data is received using the updated PMI / RI to the base station. That is, CQI that can be achieved when data is received using PMI / RI at a time point (slot) for measuring (calculating) channel quality information may be calculated. (At this time, the terminal may not report the updated PMI / RI at the time (slot) for measuring (calculating) channel quality information to the base station.)
  • channel quality information that can be achieved when data is received using the most recently reported PMI / RI is represented by CQI, and the terminal is based on the channel that was recently measured at the time of CSI measurement. PMI / RI is updated, and channel quality information that can be achieved when data is received using this is indicated as CQIopt.
  • CQIopt channel quality information that can be achieved when data is received using this
  • the periodic or semi-persistent CSI feedback (eg, CSI2) through which channel quality information is transmitted can be transmitted through available resources, either PUSCH or Physical Uplink Control Channel (PUCCH).
  • PUCCH Physical Uplink Control Channel
  • the base station compares the CQI and CQIopt received from the terminal, and can request aperiodic CSI feedback (eg, CSI1) to the terminal only when it is determined that the difference is outside a specific value. That is, when the difference between CQI and CQIopt exceeds a specific value, aperiodic CSI feedback may be triggered.
  • aperiodic CSI feedback eg, CSI1
  • CSI feedback including PMI / RI is performed based on a trigger of a base station in slot 0.
  • the UE can calculate CQI based on PMI / RI reported in slot 0, and CQIopt in slots 10/20/30
  • the UE may calculate CQIopt based on the updated PMI / RI in the corresponding slot.
  • the UE may periodically or semi-permanently transmit the calculated CQI and CQIopt to the base station. For example, it is assumed that the CQI calculated in slots 10/20/30 is 10,10,10, respectively, and the CQIopt is 11, 12, 15.
  • the base station determines whether it is necessary to update channel direction information (eg, PMI / RI) based on the received CQI and CQIopt, and transmits a signal triggering aperiodic CSI feedback (eg, CSI1) to the terminal. .
  • channel direction information eg, PMI / RI
  • CSI1 aperiodic CSI feedback
  • the base station determines whether the difference between the CQI and the CQIopt is large or small, and can request the feedback of the CSI1 to the terminal only when it is determined that the difference is large.
  • the base station can request the feedback of the CSI1 back to the terminal in slot 35 (or before slot 35), and correspondingly, can receive and report the CSI including the latest RI / PMI from the terminal.
  • the UE may calculate the CQI based on the RI / PMI transmitted in the slot 35 that was recently fed back to the base station.
  • the UE can recognize a change in the channel (or beam) state by calculating the above-described CQI and CQIopt.
  • the base station can clearly determine whether the PMI / RI needs to be updated and when.
  • the payload size required for CSI feedback can be further reduced by transmitting a difference value (eg, CQIdiff) between CQI and CQIopt instead of transmitting CQIopt.
  • CQIdiff is only an exemplary expression for convenience of description, and does not limit the scope of the present invention, and CQIdiff may correspond to CQIopt.
  • CQI calculated in slots 10/20/30 is 10, 10, and 10, and CQIopt is 11, 12, and 15, respectively.
  • the base station may determine whether it is necessary to update the PMI / RI based on the received CQI and CQIdiff, and transmit a signal to trigger the aperiodic CSI report to the terminal.
  • the PMI, CQI, and CQIopt may be reported in units of subbands.
  • CQIopt including CQIdiff
  • overhead for uplink resources may increase, so a method of reducing overhead by using a flag may be considered.
  • a 1-bit flag may be defined for each subband, and the UE may transmit a total of 10-bit flags to the base station.
  • the overhead of the uplink resource required to report CQIopt can be reduced by additionally reporting CQIopt only for the subband with the flag 1.
  • the 10-bit flag is 10000 00000
  • CQIopt can be reported only for the first subband among 10 subbands. The same can be applied to CQIdiff instead of CQIopt.
  • CQIopt may always report a value for wideband. That is, when reporting a subband CSI through CSI2, the terminal may report both the wideband CQI and the subband CQI to the base station, but CQIopt may be set to report only the wideband CQIopt.
  • CQIdiff instead of CQIopt, only the wideband CQIdiff can be reported.
  • CQI and CQIopt promise to send a specific value (for example, 0) or make the terminal send a random value. You can. The base station receiving this can ignore the information.
  • CSI2 is meaningless, so the UE may not transmit CSI2 because it is regarded as an incorrect setting.
  • the channel quality information that can be achieved when the terminal receives data using the PMI / RI reported aperiodically (latest) is represented by CQI, and the terminal measures CSI Based on the recently measured channel at the time, PMI / RI is updated, and channel quality information that can be achieved when data is received using this is indicated as CQIopt.
  • CQIopt channel quality information that can be achieved when data is received using this
  • a user equipment may calculate CQI (eg, first information) and CQIopt (eg, second information) for channel quality.
  • the UE may determine whether to transmit a flag and / or a flag value based on the CQI (eg, first information) and CQIopt (eg, second information).
  • the flag may correspond to a 1-bit value indicating whether a difference between CQI (eg, first information) and CQIopt (eg, second information) exceeds a specific value.
  • the specific value used to determine whether the flag is transmitted and / or the flag value may be determined by the base station and indicated to the terminal. Alternatively, the terminal may determine the specific value and report it to the base station.
  • CSI2 periodic or semi-persistent CSI feedback
  • CQI calculated in slots 10/20/30 is 10, 10, and 10, and CQI opt is 11, 12, and 15, respectively.
  • a specific value used to determine whether to transmit a flag and / or a flag value is set to 4.
  • the UE may not transmit a flag because the difference between CQI and CQIopt is 1 in slot 10, and the difference between CQI and CQIopt is 2 in slot 20, so the difference between CQI and CQIopt is less than the specific value.
  • a flag eg, 0
  • indicating that the difference between CQI and CQIopt does not exceed a specific value may be transmitted.
  • the base station may or may not request CSI1 feedback to the terminal in consideration of the network condition.
  • a method of extending the flag from 1 bit to n bits (where n is a natural number) and informing the base station about the difference value between CQI and CQIopt may be considered. That is, the difference value between the CQI and the CQIopt can be indicated using a flag.
  • a difference value candidate between CQI and CQIopt may be configured as a set to report in which set the difference value between CQI and CQIopt belongs to n bits. In the case of the n-bit flag, 2 * n sets may be set.
  • the terminal is a 2-bit signal to the base station, respectively.
  • the flag '00' / flag '01' / flag '10' can be transmitted.
  • the base station can know how much the difference between CQI and CQIopt has occurred.
  • a plurality of the specific values may be set, and a difference between CQI and CQIopt may be fed back with an n-bit flag, which is greater than a certain value among the plurality of specific values.
  • n-bit flag 2 n specific values can be set.
  • the specific values are set to 1,2,4,7.
  • the PMI, CQI, CQIopt, and flags may all be reported in units of subbands.
  • a method for reducing overhead may be considered.
  • the CQIopt and flag can always report a value for wideband. That is, when reporting a subband CSI through CSI2, the terminal may report both the wideband CQI and the subband CQI to the base station, but CQIopt may be set to report only the wideband CQIopt. When transmitting CQIdiff instead of CQIopt, only the wideband CQIdiff can be reported. The flag is also calculated by comparing the wideband CQI and the wideband CQIopt, and one value for the wideband can be reported.
  • CQI and CQIopt promise to send a specific value (for example, 0) or make the terminal send a random value. You can. The base station receiving this can ignore the information.
  • CSI2 is meaningless, so the UE may not transmit CSI2 because it is regarded as an incorrect setting.
  • CRI and L1-RSRP corresponding to CRI as aperiodically reported CSI feedback (e.g., CSI1), and aperiodic CSI feedback (e.g., CSI2) reported periodically or semi-permanently.
  • CSI1 aperiodically reported CSI feedback
  • CSI2 aperiodic CSI feedback
  • Only the L1-RSRP corresponding to the CRI reported in CSI1) may be reported, and the CRI may not be reported.
  • the UE may request a report trigger of CSI1 from the base station by reporting a flag together with L1-RSRP to CSI2.
  • the base station receiving the flag may trigger a CSI1 report or ignore the flag in consideration of network conditions.
  • the CQI reported through the periodic or semi-permanent CSI feedback (eg, CSI2) in the above-described methods 1 and 2 can be calculated based on the PMI / RI of the recently reported aperiodic CSI feedback (eg, CSI1). In this case, a difference may occur between the PMI / RI at the time of calculating the CQI and the recently reported PMI / RI, and the accuracy of the CQI may be deteriorated.
  • CQI indicates channel quality information that can be achieved when the UE receives data using the most recently reported PMI / RI and the reduced set of PMI / RI.
  • CQIopt represents PMI / RI updated by the UE based on the recently measured channel at the time of CSI measurement, and indicates channel quality information that can be achieved when data is received using this.
  • the above terms are only for convenience of description and do not limit the scope of the present invention.
  • the UE may calculate channel quality information (eg, CQI) based on the reduced set of PMI / RI.
  • CQI channel quality information
  • the CQI of the cyclic or semi-permanent CSI feedback eg CSI2
  • the PMI / RI the recently reported aperiodic CSI feedback
  • It can be calculated based on the partially updated PMI / RI using all of the reduced set of PMI / RI.
  • the terminal is based on the most recently reported PMI / RI value and the reduced set of PMI / RIs composed of PMI / RIs of the surrounding time. Based on the CQI can be calculated. That is, the UE can calculate the CQI as the PMI / RI value for beams near the beam vector direction of the most recently reported PMI / RI.
  • CQIs may be calculated based on values near the RI / PMI values reported in slots 0. In other words, the UE may calculate CQI using some of the beams near the beam vector direction of slot 0. As a specific example, the PMI / RI value within the range of 1 to 3 may be updated from the most recently reported PMI / RI value.
  • the UE calculates CQI using the reduced set of PMI / RI corresponding to RI 1 to 3 and PMI 9 to 11, and calculates the reduced set of PMI / RI values used to calculate the CQI together with the calculated CQI. It can report to the base station.
  • the terminal may calculate channel quality information (eg, CQIopt) that can be achieved when data is received using the entire PMI / RI of the time (eg, slot) for calculating (or measuring) CSI.
  • CQIopt channel quality information
  • the entire PMI / RI updated in the UE ie, PMI / RI used to calculate CQIopt
  • the UE may transmit a reduced set of PMI / RI together with a CQI through a periodic or semi-persistent CSI feedback (eg, CSI2), and may further transmit CQIopt.
  • periodic or semi-persistent CSI feedback eg, CSI2
  • CQI, CQIopt, periodic or semi-persistent CSI feedback eg, CSI2
  • the base station uses the reduced set of PMI / RI received from the UE through periodic or semi-persistent CSI feedback (eg, CSI2), and the PMI / RI of the recently reported aperiodic CSI feedback (eg, CSI1). Some (limited) updates.
  • periodic or semi-persistent CSI feedback eg, CSI2
  • PMI / RI of the recently reported aperiodic CSI feedback eg, CSI1
  • the PMI of the reduced set of CSI2 may be used for updating only some information of the PMI of CSI1.
  • the co-phase of the PMI components of CSI1 may be updated, or only the amplitude may be updated.
  • the cavity phase and magnitude may be updated by finding the cavity phase and magnitude within a set that is smaller than the whole.
  • the co-phase and magnitude may refer to a co-phase and magnitude constituting the LC coefficient.
  • the reduced set of PMI may mean a PMI for updating a beam combination that is a linear combination target.
  • the UE preferentially feeds back some L beams (L ⁇ M) among the M beams to be linearly combined with the PMI of CSI1 and LC coefficients to be applied to each beam, and the UE and the base station linearly combine only L beams. By doing so, a precoding matrix can be generated. Thereafter, the UE may additionally transmit the remaining M-L beams and the LC coefficients to be applied to each beam through the PMI of CSI2.
  • the UE and the base station may generate a precoding matrix by linearly combining both L beams reported / received from the PMI of CSI1 and M-L beams reported / received from the PMI of CSI2. That is, L beam information is obtained from the PMI of the most recently reported / reported CSI1 by the UE and the base station, and ML beam information is obtained from the PMI of the most recently reported / reported CSI2 to obtain a linear combination for the total M beams.
  • the M and L values may be preset / defined by the base station.
  • the base station can perform scheduling using the CQI received from the terminal and the reduced set of PMI / RI.
  • the base station may trigger reporting of the entire PMI / RI.
  • the UE can report PMI / RI with reduced overhead for payload in CSI2, and as a result, it is necessary for PMI / RI transmission as the reporting frequency for the entire PMI / RI with large overhead is minimized. PUSCH resources can be saved.
  • Method 1 when the terminal needs to report CSI2 before transmitting CSI1 (without having transmitted CSI1 once), CQI and CQIopt are sent with a specific value (for example, 0). You can either promise or let the terminal send an arbitrary value. The base station receiving this can ignore the information. Alternatively, if the UE needs to report CSI2 before transmitting CSI1 (in a state where CSI1 has never been transmitted), CSI2 is meaningless, so the UE may not transmit CSI2 because it is regarded as an incorrect setting.
  • a specific value for example, 0
  • 17 shows an example of an operation flowchart of a terminal performing CSI reporting to which the method and / or embodiment proposed in the present specification can be applied. 17 is for convenience of description only and does not limit the scope of the present invention.
  • the terminal and / or the base station operate based on the methods and / or embodiments of the method 1, method 2, and method 3 described above (here, the terminal / base station is only an example) Subsequently, it may be applied to various devices as described in FIGS. 20 to 24). Some of the steps described in FIG. 17 may be merged or omitted. In addition, in performing the procedures described below, the CSI-related operation of FIG. 15 may be considered / applied.
  • the terminal may receive the CSI report related configuration information from the base station (S1710).
  • the CSI report-related configuration information may include information on the number of beams that are a linear combination object for a linear combination (LC) codebook.
  • the CSI report related configuration information may include CSI report type information. For example, reporting on at least one of aperiodic CSI, periodic CSI, or semi-permanent CSI may be set based on the CSI report related configuration information.
  • the CSI reporting related setting information may include information on a reporting cycle for a periodic or semi-persistent CSI feedback and a report start (time and / or whether).
  • the CSI reporting related configuration information may include aperiodic, periodic and / or semi-persistent reporting type resource information for CSI.
  • one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive the CSI reporting related configuration information, and one or more transceivers 106 may Configuration information related to CSI reporting may be received.
  • the UE may periodically transmit the first CSI to the base station (S1720).
  • the first CSI (eg, CSI1) may include information about the channel direction.
  • the first CSI (eg, CSI1) may include precoding matrix information for a linear combination (LC) codebook.
  • the precoding matrix information may correspond to a PMI / RI indicating a channel direction.
  • the one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to transmit the first CSI aperiodically, and the one or more transceivers 106 may be a base station
  • the first CSI report may be transmitted aperiodically.
  • the terminal may calculate the CSI based on the CSI reporting related configuration information. Specifically, the terminal may calculate the first information about the channel quality based on the CSI reporting related setting information (S1730). For example, the first information may be calculated based on some of a number of precoding matrices associated with the first CSI. In one example, the first information may correspond to the CQI of Method 3 described above. In one example, the first information may be calculated based on PMI / RI of aperiodic CSI feedback (eg, first CSI, CSI1) and precoding matrices based on a reduced set of PMI / RI.
  • aperiodic CSI feedback eg, first CSI, CSI1
  • some of a plurality of precoding matrices used to calculate the first information may be selected by the terminal based on precoding matrix information for a linear combination (LC) codebook included in the first CSI. have.
  • some of the plurality of precoding matrices may be selected in consideration of the beam direction indicated by the precoding matrix information for the LC codebook.
  • precoding matrix information for an LC codebook may correspond to a precoding matrix indicator (PMI), and the plurality of precodings from the PMI to precoding matrices indicated by PMIs of a predetermined interval unit.
  • the terminal may calculate the second information about the channel quality.
  • the second information may be calculated based on all of the plurality of precoding matrices at the time of calculating the second CSI.
  • one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to calculate first information, second information about the channel quality, and one or more processors 102, the first information and the second information about the channel quality can be calculated.
  • the UE may transmit a second CSI (eg, CSI2) to the base station (S1740).
  • the second CSI may be transmitted periodically or semi-permanently.
  • the second CSI may include first information on channel quality (eg, CQI) and information on some of a plurality of precoding matrices used to calculate the first information.
  • the second CSI may further include second information (eg, CQIopt) for channel quality.
  • the second CSI may be transmitted through PUCCH. Or, it may be transmitted through PUSCH according to the payload size.
  • Information about some of the plurality of precoding matrices may be used to update the precoding matrix information for the linear combination (LC) codebook reported through the first CSI.
  • information on some of the plurality of precoding matrices includes co-phase and amplitude of the precoding matrix information for the linear combination (LC) codebook reported through the first CSI. It can be used for updates related to at least one of the.
  • information on some of the multiple precoding matrices may be used for updating a beam combination that is a target of a linear combination.
  • the first CSI may include information on some of the beams that are the targets of the linear combination.
  • the first CSI may include some of precoding matrix information for the LC codebook.
  • the second CSI may include information on the rest of the beams that are the targets of the linear combination.
  • the remaining precoding matrix information reported through the second CSI is updated to some of the precoding matrix information reported through the first CSI to update the entire precoding matrix.
  • the number of beams targeted for the linear combination may be set by the base station.
  • the reported CSI corresponds to a subband CSI report
  • information on some of the first information and some of the plurality of precoding matrices used to calculate the first information is a subband. It is reported in units, and the second information may be reported in units of wideband.
  • the first information and the second information included in the second CSI may be transmitted with a specific value (eg, 0).
  • the base station receiving this can ignore the information.
  • the UE may not transmit the second CSI because it is regarded as an incorrect setting.
  • one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to transmit the second CSI, and one or more transceivers 106 may transmit the second CSI to the base station.
  • CSI reports can be sent.
  • 18 shows another example of an operation flowchart of a terminal performing CSI reporting to which the method and / or embodiment proposed in the present specification can be applied. 18 is for convenience of description only and does not limit the scope of the present invention.
  • the terminal and / or the base station operate based on the methods and / or embodiments of the method 1, method 2, and method 3 described above (where the terminal / base station is only an example, Subsequently, it may be applied to various devices as described in FIGS. 20 to 24). Some of the steps described in FIG. 18 may be merged or omitted. In addition, in performing the procedures described below, the CSI-related operation of FIG. 15 may be considered / applied.
  • the UE may receive CSI reporting related configuration information from the base station (S1810).
  • the CSI report-related configuration information may include information on the number of beams that are a linear combination object for a linear combination (LC) codebook.
  • the CSI report related configuration information may include CSI report type information. For example, reporting on at least one of aperiodic CSI, periodic CSI, or semi-permanent CSI may be set based on the CSI report related configuration information.
  • the CSI reporting related setting information may include information on a reporting cycle for a periodic or semi-persistent CSI feedback and a report start (time and / or whether).
  • the CSI reporting related configuration information may include aperiodic, periodic and / or semi-persistent reporting type resource information for CSI.
  • one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive the CSI reporting related configuration information, and one or more transceivers 106 may Configuration information related to CSI reporting may be received.
  • the UE may perform CSI calculation (S1820). At this time, in the case of periodic or semi-persistent CSI feedback, the CSI may be calculated in consideration of the period set by the base station. For periodic or semi-persistent CSI reporting, the UE may calculate first and second information about channel quality based on CSI reporting related configuration information.
  • the first information may be calculated by applying the most recently aperiodically reported PMI (Precoding matrix indicator), and the second information may be calculated by applying a PMI value at the time of CSI calculation.
  • the first information indicates channel quality information that can be achieved when the terminal receives data using the most recently reported PMI / RI, and the second information is measured by the terminal at the time of CSI measurement.
  • PMI / RI may be updated based on a channel, and channel quality information that can be achieved when data is received using the channel may be represented.
  • the first information may be the above-described CQI
  • the second information may be the above-described CQIopt.
  • the first information may be calculated by applying only some PMIs among all PMIs, and the second information may be calculated by applying all PMIs at the time of CSI calculation.
  • the first information indicates channel quality information that can be achieved when data is received using the most recently reported PMI / RI and the reduced set of PMI / RI
  • the second information is the terminal
  • the PMI / RI can be entirely updated based on the recently measured channel, and channel quality information that can be achieved when data is received using this can be represented.
  • the first information may be the above-described CQI
  • the second information may be the above-described CQIopt.
  • the UE may select some PMIs among the entire PMIs based on the most recently reported PMI value. For example, the terminal may select some of the PMIs in consideration of a beam (or port) direction based on the most recently reported PMI value. It is possible to select some PMI indicating a beam corresponding to a beam direction based on the most recently reported PMI value. For example, the terminal may select PMIs having a predetermined interval as some PMIs based on the most recently reported PMI value. Based on the beam direction based on the most recently reported PMI value, some PMIs representing beams distributed at regular intervals may be selected.
  • step S1820 the operation of calculating the CSI by the terminal in step S1820 (100/200 of FIGS. 20 to 24) described above may be implemented by the apparatuses of FIGS. 20 to 24 to be described below.
  • one or more processors 102 may control one or more memory 104 to calculate the CSI, and one or more processors 102 may perform the CSI calculation.
  • the terminal may determine whether to transmit a flag and at least one of the flag values based on the first information and the second information (S1825).
  • Step S1825 may be omitted in some cases.
  • the first information may be the above-described CQI
  • the second information may be the above-described CQIopt.
  • the UE may determine that the flag is transmitted and, if it is less than a particular value, the flag is not transmitted.
  • the specific value can be set by the base station.
  • the flag value may be determined by comparing a specific value with a difference value between the first information and the second information.
  • the specific value may be determined by the base station and indicated to the terminal. Alternatively, the terminal may determine the specific value and report it to the base station.
  • a plurality of sets consisting of candidate values of a difference value between the first information (eg CQI) and the second information (eg CQIopt) may be configured.
  • the multiple sets may be predefined by the base station and / or terminal. The specific value can be included in the multiple sets.
  • the flag is composed of n bits (n is 2 or more), and a set of differences between the first information (eg, CQI) and the second information (eg, CQIopt) can be reported as an n-bit flag.
  • n-bit flag 2 * n sets may be set.
  • the specific value is set to a plurality, and the difference value between the first information (for example, CQI) and the second information (for example, CQIopt) is an n-bit flag which is a specific value or more among a plurality of specific values. You can give feedback.
  • the n-bit flag 2 n specific values can be set.
  • step S1825 the operation of determining whether at least one of the flag value and whether the flag is transmitted based on the first information and the second information by the terminal (100/200 of FIGS. 20 to 24) in step S1825 described above is as follows. 20 to 24 to be described.
  • one or more processors 102 may control one or more memories 104 and the like to determine whether to transmit the flag and at least one of the flag values, and the one or more processors 102 may transmit the flag and At least one of the flag values may be determined.
  • the UE may report (or transmit) the CSI to the base station (S1830). For example, the UE may transmit CSI through PUCCH. Alternatively, when the payload size is large, reporting may be performed through PUSCH.
  • the terminal may report to the base station including the calculated first information (eg, CQI described above) and second information (eg, CQIopt described above).
  • the difference between the first information and the second information (for example, CQIdiff described above) and the first information may be reported to the base station.
  • the reported CSI may further include a signal requesting a trigger signal for aperiodic CSI reporting.
  • the signal requesting the trigger signal for the aperiodic CSI reporting may mean a signal informing the base station that an update for the previously reported PMI / RI is required.
  • the terminal may report the CSI including the first information and the flag.
  • the terminal may report to the base station including the calculated first information, second information, and PMI (part of all PMIs) used to calculate the first information.
  • the UE may not transmit the entire PMI used to calculate the second information with periodic or semi-persistent CSI feedback.
  • the PMI used to calculate the first information may be used to update the PMI of aperiodic CSI feedback (eg, CSI1) recently reported to the base station. It may be used to update at least one of a co-phase and an amplitude of a PMI recently reported to a base station.
  • the PMI used to calculate the first information may be used to update a beam combination that is a target of a linear combination.
  • the first information may be reported in a subband unit, and the second information may be reported in a wideband unit.
  • the second information may be reported in units of subbands only for a subband when the difference between the first information and the second information is greater than or equal to a specific value.
  • the specific value may be set from a base station.
  • the terminal may further transmit information on the subband in which the second information is reported to the base station.
  • a subband through which the second information is transmitted may be displayed using a 1-bit flag allocated for each subband. For example, the flag is also calculated based on the first information of the wide band and the second information of the wide band, and one value for the wide band may be reported.
  • one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to transmit the CSI, and one or more transceivers 106 transmit the CSI report to the base station You can.
  • the terminal may receive a report trigger signal for aperiodic CSI feedback from the base station (S1840).
  • the trigger signal may be transmitted from the base station based on the first information and the second information.
  • the trigger signal may be received when the difference between the first information and the second information is greater than or equal to a specific value.
  • the specific value can be set by the base station.
  • the trigger signal may be transmitted from the base station based on the flag.
  • the above-described terminal (100/200 of FIGS. 20 to 24) in step S1840 receives a report trigger signal for aperiodic CSI feedback from the base station (100/200 of FIGS. 20 to 24).
  • Operation may be implemented by the apparatus of FIGS. 20-24, which will be described below.
  • the one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive a report trigger signal for the aperiodic CSI feedback.
  • One or more transceivers 106 may receive a report trigger signal for the aperiodic CSI feedback from the base station.
  • the terminal may transmit aperiodic CSI feedback to the base station in response to the trigger signal.
  • the aperiodic CSI may include at least one of PMI and RI.
  • the aperiodic CSI may be transmitted through PUSCH.
  • the UE may calculate the CSI using the PMI / RI reported in the aperiodic CSI feedback when calculating the periodic or semi-persistent CSI.
  • 19 shows an example of an operation flowchart of a base station receiving a CSI to which the method and / or embodiment proposed in the present specification can be applied. 19 is for convenience of description only and does not limit the scope of the present invention.
  • the terminal and / or the base station operate based on the methods and / or embodiments of the above-described method 1, method 2, and method 3 (where the terminal / base station is only an example, Subsequently, it may be applied to various devices as described in FIGS. 20 to 24). Some of the steps described in FIG. 19 may be merged or omitted. In addition, in performing the procedures described below, the CSI-related operation of FIG. 15 may be considered / applied.
  • the base station may transmit the CSI report related configuration information to the terminal (S1910).
  • the CSI report-related configuration information may include information on the number of beams that are a linear combination object for a linear combination (LC) codebook.
  • the CSI report related configuration information may include CSI report type information. For example, reporting on at least one of aperiodic CSI, periodic CSI, or semi-permanent CSI may be set based on the CSI report related configuration information.
  • the CSI reporting related setting information may include information on a reporting cycle for a periodic or semi-persistent CSI feedback and a report start (time and / or whether).
  • the CSI reporting related configuration information may include aperiodic, periodic and / or semi-persistent reporting type resource information for CSI.
  • the operation in which the base station (100/200 in FIGS. 20 to 24) of step S1910 described above transmits CSI reporting related setting information to the terminal (100/200 in FIGS. 20 to 24) will be described below. It can be implemented by the apparatus of Figure 24.
  • the one or more processors 202 may control one or more transceivers 206 and / or one or more memories 204 to transmit the CSI reporting related configuration information, and the one or more transceivers 206 may be transmitted to the terminal.
  • Configuration information related to CSI reporting may be transmitted.
  • the base station may receive the CSI from the terminal (S1920).
  • the base station may periodically receive the first CSI from the terminal.
  • the first CSI (eg, CSI1) may include information about the channel direction.
  • the channel direction information may include precoding matrix information for a linear combination (LC) codebook.
  • a PMI / RI indicating a channel direction may be included.
  • the base station may periodically or semi-continuously receive a second CSI (eg, CSI2) from the UE.
  • the second CSI may include first information (eg, CQI) and second information (eg, CQIopt) for channel quality.
  • the first information may be calculated based on some of the multiple precoding matrices.
  • the first information may be calculated based on PMI / RI of aperiodic CSI feedback (eg, first CSI, CSI1) and precoding matrices based on a reduced set of PMI / RI.
  • the second information may be calculated based on all of the plurality of precoding matrices at the time of calculating the second CSI.
  • the second CSI may further include information on some of a plurality of precoding matrices used to calculate the first information.
  • the second CSI may be received through PUCCH.
  • the corresponding step may correspond to step S1730 described above, and a detailed description thereof will be omitted.
  • the base station has first information (eg, CQI), which is channel quality information that can be achieved when the terminal receives data using the PMI / RI that the terminal has recently reported aperiodically, and when the terminal measures CSI. Based on the recently measured channel, the PMI / RI may be updated, and second information (eg, CQIopt), which is channel quality information that can be achieved when data is received using this, may be received from the terminal.
  • the first information and the second information may be periodically or semi-continuously received.
  • the first information and the second information may not include PMI and RI.
  • the base station may receive a CSI including a difference value (eg, CQIdiff described above) and first information (eg, CQI) between the first information and the second information from the terminal.
  • a CSI including a difference value (eg, CQIdiff described above) and first information (eg, CQI) between the first information and the second information from the terminal.
  • the base station may receive a signal requesting a trigger signal for aperiodic CSI reporting from the terminal.
  • the base station may receive the first information and flags from the terminal.
  • the specific value may be determined by the base station and indicated to the terminal. Alternatively, the terminal may determine the specific value and report it to the base station.
  • the flag may correspond to an n-bit value indicating which range (set) the difference value between the first information (eg CQI) and the second information (eg CQIopt) belongs to.
  • the base station may receive, as an n-bit flag, which set of difference value candidate sets belongs to a difference value between the first information (eg, CQI) and the second information (eg, CQIopt).
  • an n-bit flag may be received as to which specific value of a plurality of specific values for a difference between the first information (eg, CQI) and the second information (eg, CQIopt) occurs.
  • the first information may be reported in subband units, and the second information may be reported in wideband units.
  • the second information may be reported in units of subbands only for a subband when the difference between the first information and the second information is greater than or equal to a specific value.
  • the base station may further receive information on the subband in which the second information is reported from the terminal. For example, a subband in which the second information is transmitted may be displayed using a 1-bit flag allocated for each subband.
  • one or more processors 202 may control one or more transceivers 206 and / or one or more memories 204 to receive the CSI, and one or more transceivers 206 may receive the CSI from the terminal. You can.
  • the base station may perform the following operations based on the received CSI (S1930).
  • the base station may update information on the channel direction reported through the first CSI based on information on some of the plurality of precoding matrices of the second CSI.
  • the base station is associated with at least one of the co-phase and the amplitude (amplitude) of the information about the channel direction reported through the first CSI using the information on some of the plurality of precoding matrices Updates can be performed.
  • the base station may update the beam combination that is the target of the linear combination by using information on some of the multiple precoding matrices.
  • the information on the channel direction reported through the first CSI may include information on some of the beams that are the targets of the linear combination.
  • information about the channel direction reported through the first CSI may include some of precoding matrix information for the LC codebook.
  • the second CSI may include information on the rest of the beams that are the targets of the linear combination.
  • the base station may update the entire precoding matrix by updating some precoding matrix information received through the first CSI and the remaining precoding matrix information received through the second CSI.
  • scheduling may be performed to the terminal based on the second CSI.
  • the base station may transmit a signal triggering aperiodic CSI feedback to the terminal based on the received CSI.
  • the trigger signal may be transmitted from the base station based on the flag.
  • the triggering signal may be transmitted based on the first information and the second information.
  • the trigger signal may be transmitted when the difference between the first information and the second information is greater than or equal to a specific value.
  • the specific value may be set (defined) by the base station.
  • the signal that triggers the CSI feedback may be transmitted through DCI.
  • the operation of the base station (100/200 of FIGS. 20 to 24) in step S1930 described above may be implemented by the devices of FIGS. 20 to 24 to be described below.
  • at least one processor 202 performs an operation of updating information on a channel direction reported through the first CSI, a terminal scheduling operation, a signal transmission operation triggering aperiodic CSI feedback, and the like.
  • the one or more processors 202 may perform the above operation.
  • high-resolution codebook-based channel state information can be transmitted and received while efficiently using uplink resources.
  • the above-described methods and embodiments eg, Method 1, Method 2, Method 3, etc.
  • the terminal and / or the base station operating according to the steps of FIGS. 17, 18, and 19 are illustrated in FIGS. It can be realized specifically by the apparatus of FIG.
  • the base station may correspond to one radio device
  • the terminal may correspond to the second radio device, and vice versa.
  • the above-described base station / terminal signaling and operation may be processed by one or more processors (eg, 102, 202) of FIGS. 20 to 24, and described above.
  • One base station / terminal signaling and operation e.g., method 1, method 2, method 3, etc.
  • is an instruction / program e.g., instruction
  • it may be stored in a memory (eg, one or more memories (eg, 104,204) of FIG. 21) in the form of executable code.
  • the communication system 1 applied to the present invention includes a wireless device, a base station and a network.
  • the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device.
  • a wireless access technology eg, 5G NR (New RAT), Long Term Evolution (LTE)
  • LTE Long Term Evolution
  • the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a hand-held device 100d, and a home appliance 100e. ), An Internet of Thing (IoT) device 100f, and an AI device / server 400.
  • IoT Internet of Thing
  • the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like.
  • the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone).
  • XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like.
  • the mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.).
  • Household appliances may include a TV, a refrigerator, and a washing machine.
  • IoT devices may include sensors, smart meters, and the like.
  • the base station and the network may also be implemented as wireless devices, and the specific wireless device 200a may operate as a base station / network node to other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 through the base station 200.
  • AI Artificial Intelligence
  • the network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network.
  • the wireless devices 100a to 100f may communicate with each other through the base station 200 / network 300, but may directly communicate (e.g. sidelink communication) without going through the base station / network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. Vehicle to Vehicle (V2V) / Vehicle to everything (V2X) communication).
  • the IoT device eg, sensor
  • the IoT device may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.
  • Wireless communication / connections 150a, 150b, and 150c may be achieved between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200.
  • the wireless communication / connection is various wireless access such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, IAB (Integrated Access Backhaul)). It can be achieved through technology (eg, 5G NR), and wireless devices / base stations / wireless devices, base stations and base stations can transmit / receive radio signals to each other through wireless communication / connections 150a, 150b, 150c.
  • the wireless communication / connections 150a, 150b, 150c can transmit / receive signals through various physical channels.
  • various signal processing processes eg, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.
  • resource allocation processes e.g., resource allocation processes, and the like.
  • 21 illustrates a wireless device that can be applied to the present invention.
  • the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR).
  • ⁇ the first wireless device 100, the second wireless device 200 ⁇ is ⁇ wireless device 100x, base station 200 ⁇ and / or ⁇ wireless device 100x), wireless device 100x in FIG. ⁇ .
  • the first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108.
  • the processor 102 controls the memory 104 and / or transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.
  • the processor 102 may process information in the memory 104 to generate the first information / signal, and then transmit the wireless signal including the first information / signal through the transceiver 106.
  • the processor 102 may receive the wireless signal including the second information / signal through the transceiver 106 and store the information obtained from the signal processing of the second information / signal in the memory 104.
  • the memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102.
  • the memory 104 is an instruction to perform some or all of the processes controlled by the processor 102, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes
  • the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR).
  • the transceiver 106 can be coupled to the processor 102 and can transmit and / or receive wireless signals through one or more antennas 108.
  • the transceiver 106 may include a transmitter and / or receiver.
  • the transceiver 106 may be mixed with a radio frequency (RF) unit.
  • the wireless device may mean a communication modem / circuit / chip.
  • the second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208.
  • Processor 202 controls memory 204 and / or transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein.
  • the processor 202 may process information in the memory 204 to generate third information / signal, and then transmit a wireless signal including the third information / signal through the transceiver 206.
  • the processor 202 may receive the wireless signal including the fourth information / signal through the transceiver 206 and store the information obtained from the signal processing of the fourth information / signal in the memory 204.
  • the memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202.
  • the memory 204 is an instruction to perform some or all of the processes controlled by the processor 202, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes
  • the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR).
  • the transceiver 206 can be coupled to the processor 202 and can transmit and / or receive wireless signals through one or more antennas 208.
  • Transceiver 206 may include a transmitter and / or receiver.
  • Transceiver 206 may be mixed with an RF unit.
  • the wireless device may mean a communication modem / circuit / chip.
  • one or more protocol layers may be implemented by one or more processors 102 and 202.
  • one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP).
  • the one or more processors 102 and 202 may include one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can be created.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • the one or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.
  • the one or more processors 102, 202 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein. , To one or more transceivers 106, 206.
  • One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein PDUs, SDUs, messages, control information, data or information may be obtained according to the fields.
  • signals eg, baseband signals
  • One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
  • the one or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • Descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like.
  • the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein are either firmware or software set to perform or are stored in one or more processors 102, 202, or stored in one or more memories 104, 204. It can be driven by the above processors (102, 202).
  • the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of code, instructions and / or instructions.
  • One or more memories 104, 204 may be coupled to one or more processors 102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions, and / or instructions.
  • the one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium and / or combinations thereof.
  • the one or more memories 104, 204 may be located inside and / or outside of the one or more processors 102, 202. Also, the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as a wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, radio signals / channels, and the like referred to in the methods and / or operational flowcharts of the present document to one or more other devices.
  • the one or more transceivers 106, 206 may receive user data, control information, radio signals / channels, and the like referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. have.
  • one or more transceivers 106, 206 may be coupled to one or more processors 102, 202, and may transmit and receive wireless signals.
  • one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Additionally, the one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208, and one or more transceivers 106, 206 may be described, functions described herein through one or more antennas 108, 208.
  • the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
  • the one or more transceivers 106 and 206 process the received user data, control information, radio signals / channels, etc. using one or more processors 102, 202, and receive radio signals / channels from the RF band signal. It can be converted to a baseband signal.
  • the one or more transceivers 106 and 206 may convert user data, control information, and radio signals / channels processed using one or more processors 102 and 202 from a baseband signal to an RF band signal.
  • the one or more transceivers 106, 206 may include (analog) oscillators and / or filters.
  • FIG. 22 illustrates a signal processing circuit for a transmission signal.
  • the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060.
  • the operations / functions of FIG. 22 may be performed in processors 102, 202 and / or transceivers 106, 206 of FIG.
  • the hardware elements of FIG. 22 can be implemented in the processors 102, 202 and / or transceivers 106, 206 of FIG. 21.
  • blocks 1010 to 1060 may be implemented in processors 102 and 202 of FIG. 21.
  • blocks 1010 to 1050 may be implemented in the processors 102 and 202 of FIG. 21, and block 1060 may be implemented in the transceivers 106 and 206 of FIG. 21.
  • the codeword may be converted into a wireless signal through the signal processing circuit 1000 of FIG. 22.
  • the codeword is an encoded bit sequence of an information block.
  • the information block may include a transport block (eg, UL-SCH transport block, DL-SCH transport block).
  • the radio signal may be transmitted through various physical channels (eg, PUSCH, PDSCH).
  • the codeword may be converted into a scrambled bit sequence by the scrambler 1010.
  • the scramble sequence used for scramble is generated based on the initialization value, and the initialization value may include ID information of the wireless device.
  • the scrambled bit sequence can be modulated into a modulated symbol sequence by the modulator 1020.
  • the modulation method may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), and the like.
  • the complex modulation symbol sequence may be mapped to one or more transport layers by the layer mapper 1030.
  • the modulation symbols of each transport layer may be mapped to the corresponding antenna port (s) by the precoder 1040 (precoding).
  • the output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 by the precoding matrix W of N * M.
  • N is the number of antenna ports and M is the number of transport layers.
  • the precoder 1040 may perform precoding after performing transform precoding (eg, DFT transformation) on complex modulation symbols. Further, the precoder 1040 may perform precoding without performing transform precoding.
  • the resource mapper 1050 may map modulation symbols of each antenna port to time-frequency resources.
  • the time-frequency resource may include a plurality of symbols (eg, CP-OFDMA symbol, DFT-s-OFDMA symbol) in the time domain, and may include a plurality of subcarriers in the frequency domain.
  • the signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices through each antenna. To this end, the signal generator 1060 may include an Inverse Fast Fourier Transform (IFFT) module and a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, etc. .
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • DAC Digital-to-Analog Converter
  • the signal processing process for the received signal in the wireless device may be configured as the inverse of the signal processing processes 1010 to 1060 of FIG. 22.
  • a wireless device eg, 100 and 200 in FIG. 21
  • the received radio signal may be converted into a baseband signal through a signal restorer.
  • the signal recoverer may include a frequency downlink converter (ADC), an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module.
  • ADC frequency downlink converter
  • ADC analog-to-digital converter
  • CP remover a CP remover
  • FFT Fast Fourier Transform
  • the baseband signal may be restored to a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a de-scramble process.
  • the codeword can be restored to the original information block through decoding.
  • the signal processing circuit (not shown) for the received signal may include a signal restorer, a resource de-mapper, a post coder, a demodulator, a de-scrambler and a decoder.
  • the wireless device 23 shows another example of a wireless device applied to the present invention.
  • the wireless device may be implemented in various forms according to use-example / service (see FIG. 20).
  • the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 21, and various elements, components, units / units, and / or modules ).
  • the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140.
  • the communication unit may include a communication circuit 112 and a transceiver (s) 114.
  • communication circuit 112 may include one or more processors 102,202 and / or one or more memories 104,204 of FIG.
  • the transceiver (s) 114 can include one or more transceivers 106,206 and / or one or more antennas 108,208 in FIG.
  • the control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (eg, another communication device) through the wireless / wired interface through the communication unit 110, or externally (eg, through the communication unit 110) Information received through a wireless / wired interface from another communication device) may be stored in the memory unit 130.
  • the outside eg, another communication device
  • Information received through a wireless / wired interface from another communication device may be stored in the memory unit 130.
  • the additional element 140 may be variously configured according to the type of wireless device.
  • the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit.
  • wireless devices include robots (FIGS. 20, 100A), vehicles (FIGS. 20, 100B-1, 100B-2), XR devices (FIGS. 20, 100C), portable devices (FIGS. 20, 100D), and home appliances (Fig. 20, 100e), IoT device (Fig.
  • the wireless device may be movable or used in a fixed place depending on the use-example / service.
  • various elements, components, units / parts, and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least some of them may be connected wirelessly through the communication unit 110.
  • the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130 and 140) are connected through the communication unit 110. It can be connected wirelessly.
  • each element, component, unit / unit, and / or module in the wireless devices 100 and 200 may further include one or more elements.
  • the controller 120 may be composed of one or more processor sets.
  • control unit 120 may include a set of communication control processor, application processor, electronic control unit (ECU), graphic processing processor, and memory control processor.
  • memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory (non- volatile memory) and / or combinations thereof.
  • the portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook).
  • the mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS advanced mobile station
  • WT wireless terminal
  • the portable device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. ).
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130/140 in FIG. 23, respectively.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations.
  • the control unit 120 may perform various operations by controlling components of the portable device 100.
  • the controller 120 may include an application processor (AP).
  • the memory unit 130 may store data / parameters / programs / codes / instructions required for driving the portable device 100. Also, the memory unit 130 may store input / output data / information.
  • the power supply unit 140a supplies power to the portable device 100 and may include a wired / wireless charging circuit, a battery, and the like.
  • the interface unit 140b may support the connection between the mobile device 100 and other external devices.
  • the interface unit 140b may include various ports (eg, audio input / output ports, video input / output ports) for connection with external devices.
  • the input / output unit 140c may receive or output image information / signal, audio information / signal, data, and / or information input from a user.
  • the input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.
  • the input / output unit 140c acquires information / signal (eg, touch, text, voice, image, video) input from the user, and the obtained information / signal is transmitted to the memory unit 130 Can be saved.
  • the communication unit 110 may convert information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station.
  • the communication unit 110 may restore the received radio signal to original information / signal. After the restored information / signal is stored in the memory unit 130, it can be output in various forms (eg, text, voice, image, video, heptic) through the input / output unit 140c.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • one embodiment of the invention is one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( 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
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code can be stored in memory and driven by a processor.
  • the memory is located inside or outside the processor, and can exchange data with the processor by various known means.
  • the method of transmitting channel state information in the wireless communication system of the present invention has been mainly described as an example applied to a 3GPP LTE / LTE-A system and a 5G system (New RAT system), but can be applied to various other wireless communication systems. Do.

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

Abstract

L'invention concerne un procédé de transmission et de réception d'informations d'état de canal (CSI) dans un système de communication sans fil, et un appareil associé. En partculier, un procédé, mis en oeuvre par un équipement utilisateur (UE), pour signaler des informations d'état de canal (CSI) dans un système de communication sans fil, consiste à : recevoir d'une station de base des informations de paramétrage relatives au signalement de CSI; transmettre de manière apériodique des premières CSI à la station de base; et transmiettre périodiquement ou en semi-continu des secondes CSI à la station de base. Les premières CSI comprennent des informations de direction de canal; et les secondes CSI comprennent des premières informations et des secondes informations de qualité de canal. Les premières informations peuvent être calculées sur la base d'une partie d'une pluralité de matrices de précodage; et les secondes informations peuvent être calculées sur la base de la totalité des matrices de précodage à un moment du calcul des secondes CSI.
PCT/KR2019/012310 2018-09-21 2019-09-23 Procédé de transmission et de réception d'informations d'état de canal sur la base d'un livre de codes haute résolution dans un système de communication sans fil, et appareil associé Ceased WO2020060345A1 (fr)

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KR10-2018-0114463 2018-09-21
KR20180114463 2018-09-21

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WO2017190356A1 (fr) * 2016-05-06 2017-11-09 Qualcomm Incorporated Amélioration de livres de codes de combinaison linéaire en fd-mimo
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Publication number Priority date Publication date Assignee Title
WO2021212472A1 (fr) * 2020-04-24 2021-10-28 Qualcomm Incorporated Indicateur d'ensemble de ressources de signal de référence de sondage de rapport pour duplex intégral
CN115552806A (zh) * 2020-05-06 2022-12-30 三星电子株式会社 无线通信系统中报告信道状态的方法和装置

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