WO2020222602A1 - Procédé pour rapporter des informations d'état de canal (csi) dans un système de communication sans fil et appareil associé - Google Patents

Procédé pour rapporter des informations d'état de canal (csi) dans un système de communication sans fil et appareil associé Download PDF

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WO2020222602A1
WO2020222602A1 PCT/KR2020/005865 KR2020005865W WO2020222602A1 WO 2020222602 A1 WO2020222602 A1 WO 2020222602A1 KR 2020005865 W KR2020005865 W KR 2020005865W WO 2020222602 A1 WO2020222602 A1 WO 2020222602A1
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csi
padding
base station
size
terminal
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PCT/KR2020/005865
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English (en)
Korean (ko)
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박해욱
강지원
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received

Definitions

  • the present specification relates to a wireless communication system, and more particularly, to a method for reporting CSI in a wireless communication system and an apparatus supporting the same.
  • Wireless communication systems have been widely deployed to provide various types of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, and Single Carrier Frequency (SC-FDMA) systems.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • An object of the present invention is to provide a signaling method for configuring an applied padding scheme and an effective feedback reporting method.
  • the present specification provides control information related to determination of a dimension size for a specific domain used for CSI reporting.
  • DFT Discrete Fourier Transform
  • the padding pattern is related to a position of a subband to which the padding is applied.
  • the position of the subband to which the padding is applied is in front of the subband for initial CSI reporting, after the subband for the last CSI report, or in the middle of the subbands for CSI reporting that are set. do.
  • the padding scheme is characterized in that it is zero padding, interpolation-based padding for CSI measured based on CSI-RS, or extrapolation-based padding for CSI measured based on CSI-RS.
  • the zero padding is applied, and when the subbands for the CSI reporting are configured discontinuously, the interpolation-based or extrapolation-based padding is applied. It is characterized.
  • the CSI is characterized in that it is a linear combining-based CSI.
  • the specific region is characterized in that at least one of a spatial domain, a frequency domain, and a time domain.
  • control information is characterized in that it includes information on a bandwidth part (BWP) and information on a subband size.
  • BWP bandwidth part
  • the setting information is characterized in that it includes information about a padding pattern and information about a padding scheme.
  • the size of the DFT vector is determined based on a preset rule.
  • the CSI is characterized in that it includes a precoding matrix indicator (PMI).
  • PMI precoding matrix indicator
  • the padding pattern and the padding scheme are determined when the size of the DFT vector is larger than the dimension size.
  • the size of the DFT vector is greater than 13.
  • the dimension size is characterized in that it is determined by a product of the number of subbands and a scaling parameter used to determine a frequency unit size.
  • the present specification provides a terminal for reporting channel state information (CSI) in a wireless communication system, the terminal comprising: a transceiver for transmitting and receiving a radio signal; And a processor connected to the transceiver, wherein the processor receives, from the base station, control information related to determination of a dimension size for a specific domain used for CSI reporting; Receiving configuration information related to padding to be applied to one or more subbands for the CSI report from the base station; Comparing the size of a dimension determined based on the control information and a size of a Discrete Fourier Transform (DFT) vector used for constructing a codebook; Determining a padding pattern and a padding scheme to be applied to a subband equal to a difference between the size of the DFT vector and the size of the dimension; And reporting the CSI to the base station based on the padding pattern and the padding scheme.
  • DFT Discrete Fourier Transform
  • the one or more processors are a specific domain used for CSI reporting Receive from the base station control information related to the determination of the dimension size of the base station; Receiving configuration information related to padding to be applied to one or more subbands for the CSI report from the base station; Comparing the size of a dimension determined based on the control information and a size of a Discrete Fourier Transform (DFT) vector used for constructing a codebook; Determining a padding pattern and a padding scheme to be applied to a subband equal to a difference between the size of the DFT vector and the size of the dimension; And reporting the CSI to the base station based on the padding pattern and the padding scheme.
  • DFT Discrete Fourier Transform
  • the present specification is one or more non-transitory computer-readable medium for storing one or more instructions, the one or more executable (executable) by one or more processors.
  • the command receives, from the base station, control information related to determination of a dimension size for a specific domain used for CSI reporting; Receiving configuration information related to padding to be applied to one or more subbands for the CSI report from the base station; Comparing the size of a dimension determined based on the control information and a size of a Discrete Fourier Transform (DFT) vector used for constructing a codebook; Determining a padding pattern and a padding scheme to be applied to a subband equal to a difference between the size of the DFT vector and the size of the dimension; And reporting the CSI to the base station based on the padding pattern and the padding scheme.
  • DFT Discrete Fourier Transform
  • This specification sets the padding technique when the dimension size of information related to the spatial domain/frequency domain/time domain used for actual CSI reporting is larger than the size of the DFT vector, thereby solving the ambiguity caused by dimension mismatch. There is an effect.
  • FIG. 1 shows an example of an overall system structure of an NR to which the method proposed in the present 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 the present 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 the present 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 the present specification can be applied.
  • FIG. 6 illustrates an SSB structure
  • FIG. 9 illustrates physical channels and general signal transmission used in a 3GPP system.
  • FIG. 10 is a diagram illustrating an example of a beam used for beam management.
  • 11 is a flowchart illustrating an example of a downlink beam management procedure.
  • FIG. 12 shows an example of a downlink beam management procedure using a channel state information reference signal.
  • FIG. 13 is a flowchart illustrating an example of a process of determining a reception beam by a terminal.
  • FIG. 14 is a flowchart illustrating an example of a transmission beam determination process of a base station.
  • 15 shows an example of resource allocation in time and frequency domains related to a DL BM procedure using CSI-RS.
  • FIG 16 shows an example of an uplink beam management procedure using a sounding reference signal (SRS).
  • SRS sounding reference signal
  • 17 is a flowchart illustrating an example of an uplink beam management procedure using SRS.
  • FIG. 18 is a flowchart illustrating an example of a CSI-related procedure to which the method proposed in the present specification can be applied.
  • FIG. 19 shows an example of a DMRS configuration type.
  • 20 is a flowchart illustrating an example of a DL DMRS procedure.
  • 21 is a flowchart illustrating an example of a DL PTRS procedure.
  • FIG. 22 is a flowchart illustrating an example of a TRS procedure.
  • FIG. 23 is a flowchart illustrating an example of a downlink transmission/reception operation to which the method proposed in this specification can be applied.
  • 24 is a flowchart illustrating an example of an uplink transmission/reception operation to which the method proposed in the present specification can be applied.
  • FIG. 27 shows a flowchart of an operation of a base station performing a CSI procedure proposed in the present specification.
  • 29 is a flow chart illustrating another example of a method of operating a terminal proposed in the present specification.
  • FIG. 30 is a block diagram illustrating components of a transmitting device and a receiving device for performing the method proposed in the present specification.
  • 31 shows an example of a structure of a signal processing module in a transmission device.
  • FIG. 32 shows another example of the structure of a signal processing module in a transmission device.
  • downlink refers to communication from a base station to a terminal
  • uplink refers to 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 referred to as a first communication device, and the terminal may be referred to as a second communication device.
  • Base station is a fixed station, Node B, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G).
  • BS Base station
  • eNB evolved-NodeB
  • gNB Next Generation NodeB
  • BTS base transceiver system
  • AP access point
  • 5G network
  • the terminal may be fixed or mobile, and 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.
  • UE User Equipment
  • MS Mobile Station
  • UT user terminal
  • MSS Mobile Subscriber Station
  • SS Subscriber Station
  • AMS Advanced Mobile
  • WT Wireless terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • vehicle robot
  • AI module Drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with a wireless technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented with a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA).
  • Wi-Fi IEEE 802.11
  • WiMAX IEEE 802.16
  • IEEE 802-20 and E-UTRA
  • Evolved UTRA Evolved UTRA
  • 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA
  • LTE-A Advanced
  • LTE-A pro is an evolved version of 3GPP LTE
  • 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE/LTE-A/LTE-A pro.
  • LTE refers to technology after 3GPP TS 36.xxx Release 8.
  • LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A
  • LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro
  • 3GPP NR refers to 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.
  • RRC Radio Resource Control
  • RRC Radio Resource Control
  • CRI channel state information? Reference signal
  • CSI-RS channel state information? reference signal
  • IFDMA interleaved frequency division multiple access
  • IFFT inverse fast Fourier transform
  • L1-RSRP Layer 1 reference signal received power
  • L1-RSRQ Layer 1 reference signal received quality
  • OFDM orthogonal frequency division multiplexing
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • RRC radio resource control
  • SINR signal to interference and noise ratio
  • SSB (or SS/PBCH block): synchronization signal block (including primary synchronization signal, secondary synchronization signal and physical broadcast channel)
  • TDM time division multiplexing
  • TRP transmission and reception point
  • NR is an expression showing an example of a 5G radio access technology (RAT).
  • RAT 5G radio access technology
  • a new RAT system including NR uses an OFDM transmission scheme or a similar transmission scheme.
  • the new RAT system may follow OFDM parameters different from those of LTE.
  • the new RAT system follows the numerology of the existing LTE/LTE-A as it is, but can have a larger system bandwidth (eg, 100 MHz).
  • one cell may support a plurality of neurology. That is, terminals operating in different neurology can coexist within one cell.
  • Numerology corresponds to one subcarrier spacing in the frequency domain.
  • different numerology can be defined.
  • the three main requirements areas for 5G are (1) Enhanced Mobile Broadband (eMBB) area, (2) Massive Machine Type Communication (mMTC) area, and (3) ultra-reliability and It includes a low-latency communication (Ultra-reliable and Low Latency Communications, URLLC) area.
  • eMBB Enhanced Mobile Broadband
  • mMTC Massive Machine Type Communication
  • URLLC Low Latency Communications
  • KPI key performance indicator
  • eMBB goes far beyond basic mobile Internet access, covering rich interactive work, media and entertainment applications in the cloud or augmented reality.
  • Data is one of the key drivers of 5G, and it may not be possible to see dedicated voice services for the first time in the 5G era.
  • voice is expected to be processed as an application program simply using the data connection provided by the communication system.
  • the main reasons for the increased traffic volume are an increase in content size and an increase in the 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 the user.
  • Cloud storage and applications are increasing rapidly 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 the uplink data rate.
  • 5G is also used for remote work in the cloud, and requires much lower end-to-end delays to maintain a good user experience when tactile interfaces are used.
  • Entertainment For example, cloud gaming and video streaming is another key factor that is increasing the demand for mobile broadband capabilities. Entertainment is essential on 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 very low latency and an instantaneous amount of data.
  • one of the most anticipated 5G use cases relates to the ability to seamlessly connect embedded sensors in all fields, i.e. mMTC.
  • mMTC massive machine type computer
  • Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.
  • URLLC includes new services that will transform the industry with ultra-reliable/low-latency links such as self-driving vehicles and remote control of critical infrastructure.
  • the level of reliability and delay is 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 of providing streams rated at hundreds of megabits per second to gigabits per second. This high speed is required to deliver TVs in 4K or higher (6K, 8K and higher) resolutions as well as virtual and augmented reality.
  • Virtual Reality (VR) and Augmented Reality (AR) applications involve almost immersive sports events. Certain application programs may require special network settings. In the case of VR games, for example, game companies may need to integrate core servers with network operators' edge network servers to minimize latency.
  • Automotive is expected to be an important new driving force in 5G, with many use cases for mobile communication to vehicles. For example, entertainment for passengers demands simultaneous high capacity and high mobility mobile broadband. The reason is that future users will continue to expect high-quality connections, regardless of their location and speed.
  • Another application example in the automotive field is an augmented reality dashboard. It identifies an object in the dark on top of what the driver is looking through the front window, and displays information that tells the driver about the distance and movement of the object overlaid.
  • wireless modules enable communication between vehicles, exchange of information between the vehicle and supporting infrastructure, and exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians).
  • the safety system allows the driver to lower the risk of accidents by guiding alternative courses of action to make driving safer.
  • the next step will be a remote controlled or self-driven vehicle. It is very reliable and requires very fast communication between different self-driving vehicles and between the vehicle and the infrastructure. In the future, self-driving vehicles will perform all driving activities, and drivers will be forced to focus only on traffic abnormalities that the vehicle itself cannot identify.
  • the technical requirements of self-driving vehicles call for ultra-low latency and ultra-fast reliability to increase traffic safety to levels unachievable by humans.
  • Smart cities and smart homes referred to as smart society, will be embedded with high-density wireless sensor networks.
  • a distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of a city or home.
  • a similar setup can be done for each household.
  • Temperature sensors, window and heating controllers, burglar alarms and appliances are all wirelessly connected. 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 the behavior of suppliers and consumers, allowing smart grids to improve efficiency, reliability, economics, sustainability of production and the distribution of fuels such as electricity in an automated way.
  • the smart grid can also be viewed as another low-latency sensor network.
  • the health sector has many applications that can benefit from mobile communications.
  • the communication system can support telemedicine providing clinical care from remote locations. This can help reduce barriers to distance and improve access to medical services that are not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies.
  • a wireless sensor network based on mobile communication may 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 reconfigurable wireless links is an attractive opportunity for many industries. However, achieving this requires that the wireless connection operates with a delay, reliability and capacity similar to that of the cable, and its 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 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 a wide range and reliable location information.
  • FIG. 1 shows an example of an overall system structure of an NR to which the method proposed in the present specification can be applied.
  • the NG-RAN is composed of gNBs that provide a control plane (RRC) protocol termination for an NG-RA user plane (new AS sublayer/PDCP/RLC/MAC/PHY) and a user equipment (UE). do.
  • RRC control plane
  • UE user equipment
  • the gNBs are interconnected through an X n interface.
  • 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 neurology may be defined by subcarrier spacing and CP (Cyclic Prefix) overhead.
  • the plurality of subcarrier intervals is an integer N (or, It can be derived by scaling with ). Further, even if it is assumed that a very low subcarrier spacing is not used at a very high carrier frequency, the neurology to be used can be selected independently of the frequency band.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a number of OFDM neurology supported in the NR system may be defined as shown in Table 1.
  • NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth (wider carrier bandwidth) is supported, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.
  • SCS subcarrier spacing
  • the NR frequency band is defined as a frequency range of two types (FR1, FR2).
  • FR1 and FR2 may be configured as shown in Table 2 below. Further, FR2 may mean a millimeter wave (mmW).
  • mmW millimeter wave
  • Downlink and uplink transmission It is composed of a radio frame having a section of.
  • each radio frame It consists of 10 subframes having a section of.
  • FIG. 2 shows a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification can be applied.
  • the slots are within a subframe Are numbered in increasing order of, within the radio frame Are numbered in increasing order.
  • One slot is Consisting of consecutive OFDM symbols of, Is determined according to the used neurology and slot configuration. Slot in subframe Start of OFDM symbol in the same subframe It is aligned in time with the beginning of.
  • Table 3 shows the number of OFDM symbols per slot in a normal CP ( ), the number of slots per radio frame ( ), the number of slots per subframe ( ), and 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 an extended CP.
  • 3 shows an example of a frame structure in an NR system. 3 is merely for convenience of description and does not limit the scope of the present invention.
  • 1 subframe may include 4 slots.
  • a mini-slot may be composed of 2, 4 or 7 symbols, or may be composed of more or fewer symbols.
  • an antenna port In relation to the physical resource in the NR system, 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 a channel carrying a symbol on the antenna port can be inferred from a channel carrying another symbol on the same antenna port.
  • the two antenna ports are QC/QCL (quasi co-located or quasi co-location) relationship.
  • the wide range characteristic includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 4 shows an example of a resource grid supported by a wireless communication system to which the method proposed in the present specification can be applied.
  • the resource grid on the frequency domain It is composed of subcarriers, and one subframe Although it is exemplarily described as consisting of OFDM symbols, it is not limited thereto.
  • the transmitted signal is One or more resource grids composed of subcarriers and Is described by the OFDM symbols. From here, to be. remind Denotes a maximum transmission bandwidth, which may vary between uplink and downlink as well as neurology.
  • the neurology And one resource grid may be configured 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 the present specification can be applied.
  • each element of the resource grid for the antenna port p is referred to as a resource element, and an index pair Is uniquely identified by From here, Is the index in the frequency domain, Refers to the position of a symbol within a subframe.
  • an index pair Is used. From here, to be.
  • antenna port p Is a complex value Corresponds to. If there is no risk of confusion or if a specific antenna port or neurology is not specified, the indices p and Can be dropped, resulting in a complex value or Can be
  • the physical resource block (physical resource block) in 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 the PCell downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block and point A of the lowest resource block overlapping the SS/PBCH block used by the UE for initial cell selection, and a 15 kHz subcarrier spacing for FR1 It is expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;
  • -absoluteFrequencyPointA represents the frequency-position of point A expressed as in the absolute radio-frequency channel number (ARFCN).
  • Common resource blocks set the subcarrier interval Numbered from 0 to the top in the frequency domain for.
  • Subcarrier spacing setting The center of subcarrier 0 of the common resource block 0 for is coincided with'point A'.
  • the resource element (k,l) for may be given as in Equation 1 below.
  • Is It can be defined relative to point A so that it corresponds to a subcarrier centered on point A.
  • Physical resource blocks are from 0 in the bandwidth part (BWP) Numbered to, Is the number of the BWP.
  • Physical resource block in BWP i And common resource block The relationship between may be given by Equation 2 below.
  • the UE may perform cell search, system information acquisition, beam alignment for initial access, and DL measurement based on the SSB.
  • SSB is used interchangeably with SS/PBCH (Synchronization Signal/Physical Broadcast Channel) block.
  • SS/PBCH Synchronization Signal/Physical Broadcast Channel
  • the SSB is composed of PSS, SSS and PBCH.
  • the SSB is composed of 4 consecutive OFDM symbols, and PSS, PBCH, SSS/PBCH and PBCH are transmitted for each OFDM symbol.
  • the PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers, and the PBCH is composed of 3 OFDM symbols and 576 subcarriers.
  • Polar coding and Quadrature Phase Shift Keying (QPSK) are applied to the PBCH.
  • the PBCH consists of a data RE and a demodulation reference signal (DMRS) RE for each OFDM symbol. There are 3 DMRS REs for each RB, and 3 data REs exist between the DMRS REs.
  • DMRS demodulation reference signal
  • Cell search refers to a process in which a UE acquires time/frequency synchronization of a cell and detects a cell identifier (eg, Physical layer Cell ID, PCID) of the cell.
  • PSS is used to detect a cell ID within a cell ID group
  • SSS is used to detect a cell ID group.
  • PBCH is used for SSB (time) index detection and half-frame detection.
  • the cell search process of the terminal may be summarized as shown in Table 5 below.
  • cell ID groups There are 336 cell ID groups, and 3 cell IDs exist for each cell ID group. There are a total of 1008 cell IDs, and the cell ID may be defined by Equation 3.
  • NcellID represents a cell ID (eg, PCID).
  • N(1)ID represents a cell ID group and is provided/acquired through SSS.
  • N(2)ID represents the cell ID in the cell ID group and is provided/acquired through PSS.
  • the PSS sequence dPSS(n) may be defined to satisfy Equation 4.
  • the SSS sequence dSSS(n) may be defined to satisfy Equation 5.
  • the SSB is transmitted periodically according to the SSB period.
  • the SSB basic period assumed by the UE during initial cell search is defined as 20 ms.
  • the SSB period may be set to one of ⁇ 5ms, 10ms, 20ms, 40ms, 80ms, 160ms ⁇ by the network (eg, base station).
  • a set of SSB bursts is constructed.
  • the SSB burst set consists of a 5 ms time window (ie, half-frame), and the SSB can be transmitted up to L times within the SS burst set.
  • the maximum number of transmissions L of the SSB may be given as follows according to the frequency band of the carrier. One slot contains at most two SSBs.
  • the temporal position of the SSB candidate within the SS burst set may be defined as follows according to the SCS.
  • the temporal position of the SSB candidate is indexed from 0 to L-1 in the temporal order within the SSB burst set (ie, half-frame) (SSB index).
  • -Case A-15 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 2, 8 ⁇ + 14*n.
  • n 0, 1.
  • n 0, 1, 2, 3.
  • -Case B-30 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 4, 8, 16, 20 ⁇ + 28*n.
  • n 0.
  • n 0, 1.
  • -Case C-30 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 2, 8 ⁇ + 14*n.
  • n 0, 1.
  • n 0, 1, 2, 3.
  • n 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.
  • -Case E-240 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 8, 12, 16, 20, 32, 36, 40, 44 ⁇ + 56*n.
  • n 0, 1, 2, 3, 5, 6, 7, 8.
  • the UE can acquire DL synchronization by detecting the SSB.
  • the terminal may identify the structure of the SSB burst set based on the detected SSB index, and accordingly, may detect a symbol/slot/half-frame boundary.
  • the number of the frame/half-frame to which the detected SSB belongs can be identified using SFN information and half-frame indication information.
  • the UE may obtain 10-bit SFN (System Frame Number) information from the PBCH (s0 to s9).
  • PBCH System Frame Number
  • MIB Master Information Block
  • PBCH TB Transport Block
  • the terminal may acquire 1-bit half-frame indication information (c0).
  • the half-frame indication information may be implicitly signaled using PBCH DMRS.
  • the UE may acquire an SSB index based on the DMRS sequence and PBCH payload.
  • SSB candidates are indexed from 0 to L-1 in time order within the SSB burst set (ie, half-frame).
  • L 4 out of 3 bits that can be indicated by using 8 PBCH DMRS sequences, the SSB index is indicated and the remaining 1 bit may be used for half-frame indication (b2).
  • a terminal receives information from a base station through a downlink (DL), and the terminal transmits information to the base station through an uplink (UL).
  • 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 information transmitted and received by them.
  • the terminal When the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S601). To this end, the UE receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) from the base station to synchronize with the base station and obtain information such as cell ID. Thereafter, the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain intra-cell broadcast information. Meanwhile, the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check a downlink channel state.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH physical broadcast channel
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE acquires more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to the information carried on the PDCCH. It can be done (S602).
  • a physical downlink control channel (PDCCH)
  • a physical downlink shared channel (PDSCH)
  • the terminal may perform a random access procedure (RACH) for 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 to the preamble through a PDCCH and a corresponding PDSCH (RAR (Random Access Response) message)
  • PRACH physical random access channel
  • RAR Random Access Response
  • a contention resolution procedure may be additionally performed (S606).
  • the UE receives PDCCH/PDSCH (S607) and Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel as a general uplink/downlink signal transmission procedure.
  • Control Channel; PUCCH) transmission (S608) may be performed.
  • the terminal may receive downlink control information (DCI) through the PDCCH.
  • DCI includes control information such as resource allocation information for the terminal, and different formats may be applied according to the purpose of use.
  • control information transmitted by the terminal to the base station through the uplink or received from the base station by the terminal is a downlink/uplink ACK/NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI). ), etc.
  • the UE may transmit control information such as CQI/PMI/RI described above through PUSCH and/or PUCCH.
  • Table 6 shows an example of the DCI format in the NR system.
  • DCI format 0_0 is used for PUSCH scheduling in one cell.
  • DCI format 0_0 is CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI and transmitted. And, DCI format 0_1 is used to reserve a PUSCH in one cell.
  • the information included in DCI format 0_1 is transmitted after being CRC scrambled by C-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI.
  • DCI format 1_0 is used for PDSCH scheduling in one DL cell.
  • the information included in DCI format 1_0 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI.
  • DCI format 1_1 is used for PDSCH scheduling in one cell.
  • DCI Format 1_1 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI.
  • DCI format 2_1 is used to inform the PRB(s) and OFDM symbol(s) which may be assumed to be not intended for transmission by the UE.
  • DCI format 2_1 The following information included in DCI format 2_1 is CRC scrambled by INT-RNTI and transmitted.
  • preemption indication N preemption indication 1
  • the dimension size of information related to the spatial domain/frequency domain/time domain used for actual CSI reporting is less than the size of the DFT vector
  • a signaling scheme and UE/BS behavior for setting/instructing/supporting the padding scheme applied in small cases are proposed.
  • '/' may mean that all the contents separated by / are included (and) or only some of the classified contents are included (or).
  • downlink refers to communication from a base station to a terminal
  • uplink refers to 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 referred to as a first communication device, and the terminal may be referred to as a second communication device.
  • Base station is a fixed station, Node B, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G).
  • BS Base station
  • eNB evolved-NodeB
  • gNB Next Generation NodeB
  • BTS base transceiver system
  • AP access point
  • 5G network
  • AI Artificial Intelligence
  • RSU road side unit
  • robot drone
  • UAV Unmanned Aerial Vehicle
  • AR Augmented Reality
  • VR Virtual Reality
  • the terminal may be fixed or mobile, and UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile) Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), It can be replaced with terms such as robot, AI (Artificial Intelligence) module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device.
  • the BM procedure includes a base station (eg, gNB, TRP, etc.) and/or a terminal (eg, UE) beam set that can be used for downlink (DL) and uplink (uplink, UL) transmission/reception.
  • a base station eg, gNB, TRP, etc.
  • a terminal eg, UE
  • L1 layer 1
  • L2 layer 2
  • -Beam measurement An operation in which the base station or the UE measures the characteristics of the received beamforming signal.
  • Tx beam transmission beam
  • Rx beam reception beam
  • -Beam sweeping An operation of covering a spatial area using a transmit and/or receive beam for a certain time interval in a predetermined manner.
  • -Beam report An operation in which the UE reports information on a beam formed signal based on beam measurement.
  • the BM procedure can be divided into (1) a DL BM procedure using a synchronization signal (SS)/physical broadcast channel (PBCH) block or a 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.
  • DL BM Downlink Beam Management
  • FIG. 10 is a diagram illustrating an example of a beam used for beam management.
  • the DL BM procedure may include (1) transmission of beamformed DL RS (reference signals) (eg, CSI-RS or SS Block (SSB)) of the base station, and (2) beam reporting of the terminal.
  • DL RS reference signals
  • SSB SS Block
  • the beam reporting may include a preferred (preferred) DL RS identifier (s) and a corresponding L1-RSRP (Reference Signal Received Power).
  • s preferred DL RS identifier
  • L1-RSRP Reference Signal Received Power
  • the DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RS Resource Indicator (CRI).
  • SSBRI SSB Resource Indicator
  • CRI CSI-RS Resource Indicator
  • the SSB beam and the CSI-RS beam may be used for beam management.
  • 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 over a plurality of SSB bursts.
  • one SS burst includes one or more SSBs
  • one SS burst set includes one or more SSB bursts.
  • 11 is a flowchart illustrating an example of a downlink beam management procedure.
  • 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 (S910).
  • Table 7 shows an example of CSI-ResourceConfig IE, and as shown in Table A, BM configuration using SSB is not separately defined, and SSB is configured as CSI-RS resource.
  • csi-SSB-ResourceSetList parameter represents a list of SSB resources used for beam management and reporting in one resource set.
  • the SSB resource set is ⁇ SSBx1, SSBx2, SSBx3, SSBx4, ... Can be set to ⁇ .
  • SSB index can be defined from 0 to 63.
  • the terminal receives an SSB resource from the base station based on the CSI-SSB-ResourceSetList (S920).
  • the terminal reports the best SSBRI and the corresponding L1-RSRP to the base station (beam) (S930).
  • the UE reports the best SSBRI and the corresponding L1-RSRP to the base station.
  • the UE when the UE is configured with a CSI-RS resource in the same OFDM symbol(s) as SSB (SS/PBCH Block) and'QCL-TypeD' is applicable, the UE has CSI-RS and SSB'QCL-TypeD' 'From the point of view, we can assume that it is quasi co-located.
  • SSB SS/PBCH Block
  • the QCL TypeD may mean that QCL is performed between antenna ports in terms of a spatial Rx parameter.
  • the same reception beam may be applied.
  • the UE does not expect the CSI-RS to be configured in the RE overlapping the RE of the SSB.
  • CSI-RS when a repetition parameter is set in a specific CSI-RS resource set and TRS_info is not set, the CSI-RS is used for beam management. ii) When the repetition parameter is not set and TRS_info is set, the CSI-RS is used for a tracking reference signal (TRS). iii) If the repetition parameter is not set and TRS_info is not set, the CSI-RS is used for CSI acquisition.
  • TRS tracking reference signal
  • Such a repetition parameter may be set only for CSI-RS resource sets linked with L1 RSRP or CSI-ReportConfig having a report of'No Report (or None)'.
  • CSI-ReportConfig in which reportQuantity is set to'cri-RSRP' or'none'
  • CSI-ResourceConfig higher layer parameter resourcesForChannelMeasurement
  • the terminal When repetition is set to'ON', it is related to the Rx beam sweeping procedure of the terminal.
  • the terminal may assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, 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 in different OFDM symbols.
  • the UE does not expect to receive different periods in periodicityAndOffset in all CSI-RS resources in the NZP-CSI-RS-Resourceset.
  • Repetition when Repetition is set to'OFF', it is related to the Tx beam sweeping procedure of the base station.
  • repetition when repetition is set to'OFF', the UE does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through different Tx beams.
  • CSI-RS Channel State Information-Reference Signal
  • FIG. 12(a) shows the Rx beam determination (or refinement) procedure of the UE
  • FIG. 12(b) shows the Tx beam sweeping procedure of the base station.
  • FIG. 12(a) shows a case where the repetition parameter is set to'ON'
  • FIG. 12(b) shows a case where the repetition parameter is set to'OFF'.
  • FIG. 13 is a flowchart illustrating an example of a process of determining a reception beam by a terminal.
  • the terminal receives the NZP CSI-RS resource set IE including the higher layer parameter repetition from the base station through RRC signaling (S1110).
  • the repetition parameter is set to'ON'.
  • the UE repeatedly receives resource(s) in the CSI-RS resource set set to repetition'ON' in different OFDM symbols through the same Tx beam (or DL spatial domain transmission filter) of the base station (S1120).
  • the terminal determines its own Rx beam (S1130).
  • the UE omits the CSI report (S1140).
  • the reportQuantity of the CSI report config may be set to'No report (or None)'.
  • the CSI report may be omitted.
  • FIG. 14 is a flowchart illustrating an example of a transmission beam determination process of a base station.
  • the terminal receives the NZP CSI-RS resource set IE including the higher layer parameter repetition from the base station through RRC signaling (S1210).
  • the repetition parameter is set to'OFF', and is related to the Tx beam sweeping procedure of the base station.
  • the terminal receives resources in the CSI-RS resource set set to repetition'OFF' through different Tx beams (DL spatial domain transmission filters) of the base station (S1220).
  • Tx beams DL spatial domain transmission filters
  • the terminal selects (or determines) the best beam (S1230)
  • the terminal reports the ID and related quality information (eg, L1-RSRP) for the selected beam to the base station (S1240).
  • the reportQuantity of the CSI report config may be set to'CRI + L1-RSRP'.
  • the UE reports the CRI and the L1-RSRP thereof to the base station.
  • 15 shows an example of resource allocation in time and frequency domains related to a DL BM procedure using CSI-RS.
  • the UE may receive a list of up to M candidate transmission configuration indication (TCI) states for at least QCL (Quasi Co-location) indication purposes.
  • TCI transmission configuration indication
  • QCL Quadrature Co-location
  • Each TCI state can be set as one RS set.
  • Each ID of a DL RS for spatial QCL purpose (QCL Type D) in at least an 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 ID of the DL RS(s) in the RS set used for spatial QCL purposes may be performed through at least explicit signaling.
  • Table 8 shows an example of the TCI-State IE.
  • the TCI-State IE is associated with one or two DL reference signals (RS) corresponding quasi co-location (QCL) types.
  • RS DL reference signals
  • QCL quasi co-location
  • the bwp-Id parameter indicates the DL BWP where the RS is located
  • the cell parameter indicates the carrier where the RS is located
  • the reference signal parameter is a reference that is a source of quasi co-location for the target antenna port(s). It represents the antenna port(s) or a reference signal including it.
  • 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.
  • a TCI state ID may be indicated in each CORESET setting.
  • the TCI state ID may be indicated through DCI.
  • the antenna port is defined so that a channel carrying a symbol on an antenna port can be inferred from a channel carrying another symbol on the same antenna port.
  • the two antenna ports are QC/QCL (quasi co-located or quasi co-location). ) It can be said that it is in a relationship.
  • the channel characteristics are delay spread, Doppler spread, frequency/Doppler shift, average received power, and received timing/average delay) and Spatial RX parameter.
  • the Spatial Rx parameter means a spatial (receiving) channel characteristic parameter such as angle of arrival.
  • the UE may be configured as a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config in order to decode the PDSCH according to the detected PDCCH having DCI intended for the UE and a given serving cell.
  • the M depends on the UE capability.
  • Each TCI-State includes a parameter for setting 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 with the 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 indicate/set that a specific TRS and a specific SSB and a QCL are provided in a QCL-Type A perspective and a QCL-Type D perspective. have.
  • the UE receiving this indication/configuration receives the corresponding NZP CSI-RS using the Doppler and delay values measured in the QCL-TypeA TRS, and applies the reception beam used for QCL-TypeD SSB reception to the corresponding NZP CSI-RS reception. can do.
  • the UE may receive an activation command by MAC CE signaling used to map up to 8 TCI states to the codepoint of the DCI field'Transmission Configuration Indication'.
  • beam reciprocity (or beam correspondence) between Tx beam and Rx beam may or may not be established according to UE implementation. If reciprocity between the Tx beam and the Rx beam is established in both the base station and the terminal, a UL beam pair may be matched through a DL beam pair. However, when the reciprocity between the Tx beam and the Rx beam is not established at either of the base station and the terminal, a UL beam pair determination process is required separately from the DL beam pair determination.
  • the base station can use the UL BM procedure to determine the DL Tx beam without requesting the terminal 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'Beam Management (BM)', only one SRS resource may be transmitted to each of a plurality of SRS resource sets at a given time instant.
  • BM Beam Management
  • the terminal may receive one or more Sounding Reference Symbol (SRS) resource sets set by the (higher layer parameter) SRS-ResourceSet (through higher layer signaling, RRC signaling, etc.).
  • SRS Sounding Reference Symbol
  • the UE may be configured with 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 can be divided into a Tx beam sweeping of a terminal and an Rx beam sweeping of a base station.
  • FIG. 16 shows an example of an uplink beam management procedure using a sounding reference signal (SRS).
  • SRS sounding reference signal
  • Figure 16 (a) shows the Rx beam determination procedure of the base station
  • Figure 16 (b) shows the Tx beam sweeping procedure of the terminal.
  • 17 is a flowchart illustrating an example of an uplink beam management procedure using SRS.
  • the UE receives RRC signaling (eg, SRS-Config IE) including a usage parameter set to “beam management” from the base station (S1510).
  • RRC signaling eg, SRS-Config IE
  • Table 9 shows an example of an SRS-Config IE (Information Element), and the SRS-Config IE is used for SRS transmission configuration.
  • the 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 can trigger the transmission of the SRS resource set using the configured aperiodicSRS-ResourceTrigger (L1 DCI).
  • usage indicates a higher layer parameter indicating whether the SRS resource set is used for beam management, 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 the spatial relation between the reference RS and the 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 a Tx beam for an SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S1520).
  • SRS-SpatialRelation Info is set for each SRS resource, and indicates whether to apply the same beam as the beam used in SSB, CSI-RS or SRS for each SRS resource.
  • SRS-SpatialRelationInfo may or may not be set for each SRS resource.
  • the terminal randomly determines a Tx beam and transmits the SRS through the determined Tx beam (S1530).
  • the UE applies the same spatial domain transmission filter (or generated from the filter) as the spatial domain Rx filter used for SSB/PBCH reception, and the corresponding SRS resource To transmit; or
  • the UE transmits the SRS resource by applying the same spatial domain transmission filter used for reception of periodic CSI-RS or SP CSI-RS; or
  • the UE transmits the SRS resource by applying the same spatial domain transmission filter used for transmission of periodic SRS.
  • the terminal may or may not receive feedback on the SRS from the base station as in the following three cases (S1540).
  • Spatial_Relation_Info When Spatial_Relation_Info is set for all SRS resources in the SRS resource set, the UE transmits the SRS through a beam indicated by the base station. For example, if Spatial_Relation_Info all indicate the same SSB, CRI, or SRI, the UE repeatedly transmits the SRS with the same beam. In this case, it corresponds to FIG. 14(a) as a use for the base station to select an 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 UE sweeps the Tx beam and corresponds to FIG. 16(b).
  • Spatial_Relation_Info can be set only for some SRS resources in the SRS resource set.
  • the SRS is transmitted through the indicated beam, and for the SRS resource for which Spatial_Relation_Info is not configured, the terminal may arbitrarily apply and transmit a Tx beam.
  • FIG. 18 is a flowchart illustrating an example of a CSI-related procedure to which the method proposed in the present specification can be applied.
  • the channel state information-reference signal (CSI-RS) is time and/or frequency tracking, CSI calculation, and L1 (layer 1)-RSRP (reference signal received). power) is used for computation and mobility.
  • CSI-RS channel state information-reference signal
  • L1 layer 1-RSRP (reference signal received). power
  • a and/or B used herein may be interpreted as having the same meaning as “including at least one of A or B”.
  • the CSI computation is related to CSI acquisition (acquisition), and the L1-RSRP computation is related to beam management (BM).
  • Channel state information collectively refers to information that can indicate the quality of a radio channel (or link) formed between a terminal and an antenna port.
  • a terminal e.g., user equipment, UE transmits configuration information related to CSI to a base station (e.g., general Node B) through radio resource control (RRC) signaling. , gNB) (S1610).
  • RRC radio resource control
  • the configuration information related to the CSI is CSI-IM (interference management) resource related information, CSI measurement configuration related information, CSI resource configuration related information, CSI-RS resource related information Alternatively, it may include at least one of information related to CSI report configuration.
  • CSI-IM interference management
  • the 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.
  • the CSI resource configuration related information defines a group including at least one of a non zero power (NZP) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resource set.
  • NZP non zero power
  • the CSI resource configuration related information includes a CSI-RS resource set list
  • the CSI-RS resource set list is at least one of the NZP CSI-RS resource set list, CSI-IM resource set list, or CSI-SSB resource set list It can contain one.
  • the CSI resource configuration related information may be expressed as CSI-ResourceConfig IE.
  • the CSI-RS resource set is identified by the CSI-RS resource set ID, and one resource set includes at least one CSI-RS resource.
  • Each CSI-RS resource is identified by a CSI-RS resource ID.
  • parameters indicating the use of CSI-RS for each NZP CSI-RS resource set may be set.
  • Table 10 shows an example of the NZP CSI-RS resource set IE.
  • the repetition parameter is a parameter indicating whether the same beam is repeatedly transmitted, and indicates whether repetition is'ON' or'OFF' for each NZP CSI-RS resource set.
  • Tx beam may be interpreted as a spatial domain transmission filter
  • Rx beam may have the same meaning as a spatial domain reception filter
  • the UE when the repetition parameter in Table 10 is set to'OFF', the UE does not assume that NZP CSI-RS resource(s) in the resource set are transmitted in the same DL spatial domain transmission filter and the same Nrofports in all symbols.
  • the repetition parameter corresponding to the higher layer parameter corresponds to the'CSI-RS-ResourceRep' of the L1 parameter.
  • the CSI report configuration related information includes a report ConfigType parameter indicating a 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.
  • the CSI report configuration related information may be expressed as CSI-ReportConfig IE, and Table 11 below shows an example of the CSI-ReportConfig IE.
  • the terminal measures CSI based on configuration information related to the CSI (S1620).
  • the CSI measurement may include (1) a CSI-RS reception process of the terminal (S1822), and (2) a process of calculating CSI through the received CSI-RS (S1624).
  • Equation 6 The sequence for the CSI-RS is generated by Equation 6 below, and the initialization value of the pseudo-random sequence C(i) is defined by Equation 7.
  • Equations 6 and 7 Represents the slot number in the radio frame, and the pseudo-random sequence generator Is initialized to Cint at the beginning of each OFDM symbol.
  • l is the OFDM symbol number in the slot
  • n ID is the same as the higher-layer parameter scramblingID.
  • RE (resource element) mapping of the CSI-RS resource is set in the time and frequency domains by the higher layer parameter CSI-RS-ResourceMapping.
  • Table 12 shows an example of CSI-RS-ResourceMapping IE.
  • density (D) represents the density of the CSI-RS resource measured in RE/port/PRB (physical resource block), and nrofPorts represents the number of antenna ports.
  • the terminal reports the measured CSI to the base station (S12030).
  • the terminal may omit the report.
  • the terminal may report to the base station.
  • the aperiodic TRS is triggered or the repetition is set.
  • CSI report is'No report','SSB Resource Indicator (SSBRI) and L1-RSRP','CSI-RS Resource Indicator (CRI) and L1- RSRP' could all be possible.
  • SSBRI SSB Resource Indicator
  • CRI CRI-RS Resource Indicator
  • the CSI report of'SSBRI and L1-RSRP' or'CRI and L1-RSRP' is defined to be transmitted, and when the repetition is'ON','No report','SSBRI and L1' -RSRP', or'CRI and L1-RSRP' may be defined to be transmitted.
  • the NR system supports more flexible and dynamic CSI measurement and reporting.
  • the CSI measurement may include a procedure for acquiring CSI by receiving a CSI-RS and computing the received CSI-RS.
  • CM channel measurement
  • IM interference measurement
  • CSI-IM For the configuration of CSI-IM, a 4 port NZP CSI-RS RE pattern is used.
  • NR's CSI-IM-based IMR has a design similar to that of LTE's CSI-IM, and is set independently from ZP CSI-RS resources for PDSCH rate matching.
  • each port emulates an interference layer with a (preferred channel and) precoded NZP CSI-RS.
  • 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 measures interference by assuming a channel / interference layer for each port in the resource set.
  • a number of resources are set in a set, and 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 a configuration for an 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 the set CSI-RS resource set.
  • 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 (composed of NZP CSI-RS or CSI-IM) ) Includes resource.
  • SSB SS/PBCH block
  • Each CSI resource setting is located in the DL BWP (bandwidth part) identified by the higher layer parameter bwp-id.
  • the time domain behavior of the CSI-RS resource within the CSI resource setting included in the CSI-ResourceConfig IE is indicated by the higher layer parameter resourceType, and may be set to aperiodic, periodic or semi-persistent.
  • the number of set CSI-RS resource sets (S) is limited to '1'.
  • the set periodicity and slot offset are given in the numerology of the associated DL BWP, as given by the bwp-id.
  • the same time domain behavior is configured for CSI-ResourceConfig.
  • the same time domain behavior is configured for CSI-ResourceConfig.
  • CM channel measurement
  • IM interference measurement
  • a channel measurement resource may be an NZP CSI-RS for CSI acquisition
  • an interference measurement resource may be a CSI-IM and an NZP CSI-RS for IM.
  • CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.
  • NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multi-users.
  • the UE may assume that CSI-RS resource(s) for channel measurement and CSI-IM / NZP CSI-RS resource(s) for interference measurement configured for one CSI reporting are'QCL-TypeD' for each resource. .
  • resource setting can mean a list of resource sets.
  • each trigger state set using the higher layer parameter CSI-AperiodicTriggerState is one or more CSI-ReportConfig and each CSI-ReportConfig is linked to a periodic, semi-persistent or aperiodic resource setting.
  • One reporting setting can be connected with up to three resource settings.
  • the resource setting (given by higher layer parameter resourcesForChannelMeasurement) is for channel measurement for L1-RSRP computation.
  • the first resource setting (given by 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 the corresponding resource set. .
  • the number of CSI-RS resources for channel measurement is the same as the number of CSI-IM resources.
  • the UE when interference measurement is performed in the NZP CSI-RS, the UE does not expect to be set as one or more NZP CSI-RS resources in the associated resource set within the resource setting for channel measurement.
  • the UE in which the higher layer parameter nzp-CSI-RS-ResourcesForInterference is configured does not expect 18 or more NZP CSI-RS ports to be configured in the NZP CSI-RS resource set.
  • the UE assumes the following.
  • Each NZP CSI-RS port configured for interference measurement corresponds to an interfering transport layer.
  • time and frequency resources that can be used by the UE are controlled by the base station.
  • Channel state information is a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS/PBCH block resource indicator (SSBRI), a 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
  • LI indicator
  • RI rank indicator
  • L1-RSRP 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 -Set by higher layer (provided by TriggerStateList).
  • each trigger state includes a channel and an associated CSI-ReportConfigs list indicating selectively interference resource set IDs.
  • 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, refer to CSI-ReportConfig IE.
  • SP CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH.
  • a period and a slot offset are set to RRC, and CSI reporting is activated/deactivated by a separate MAC CE.
  • the periodicity of SP CSI reporting is set to RRC, but the slot offset is not set to RRC, and SP CSI reporting is activated/deactivated by DCI (format 0_1).
  • the initial CSI reporting timing follows a PUSCH time domain allocation value indicated by DCI, and the subsequent CSI reporting timing follows a period set by RRC.
  • SP-CSI C-RNTI For SP CSI reporting on PUSCH, a separate RNTI (SP-CSI C-RNTI) is used.
  • 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 having data transmission on the SPS PUSCH.
  • aperiodic CSI reporting is performed on PUSCH and is triggered by DCI.
  • AP CSI-RS timing is set by RRC.
  • the timing for AP CSI reporting is dynamically controlled by DCI.
  • a method of dividing and reporting CSI in a plurality of reporting instances that were applied to PUCCH-based CSI reporting in LTE (eg, transmission in the order of RI, WB PMI/CQI, and SB PMI/CQI) is not applied.
  • the NR limits the setting of a specific CSI report in the short/long PUCCH, and a CSI omission rule is defined.
  • the PUSCH symbol/slot location is dynamically indicated by DCI.
  • candidate slot offsets are set by RRC.
  • a slot offset (Y) is set for each reporting setting.
  • slot offset K2 is set separately.
  • Two CSI latency classes (low latency class, high latency class) are defined in terms of CSI computation complexity.
  • low latency CSI it is a WB CSI including a maximum of 4 ports Type-I codebook or a maximum of 4-ports non-PMI feedback CSI.
  • High latency CSI refers to CSI other than low latency CSI.
  • (Z, Z') is defined in the unit of OFDM symbols.
  • Z represents the minimum CSI processing time until CSI reporting is performed after receiving the Aperiodic CSI triggering DCI.
  • Z' represents the minimum CSI processing time until CSI reporting is performed after receiving the CSI-RS for the channel/interference.
  • the UE reports the number of CSIs that can be simultaneously calculated.
  • Table 13 below shows the CSI reporting configuration defined in TS38.214.
  • Table 14 below is information related to activation/deactivation/trigger by MAC-CE related to Semi-Persistent/Aperiodic CSI reporting defined in TS38.321.
  • the DMRS is characterized in that it is transmitted only when necessary to enhance network energy efficiency and to ensure forward compatibility.
  • the time domain density of the DMRS may vary according to the speed or mobility of the terminal. That is, the density of the DMRS may increase in the time domain in order to track the rapid change of the radio channel in NR.
  • DL refers to signal transmission (or communication) from a base station to a terminal.
  • the terminal When receiving the PDSCH scheduled according to DCI format 1_0, or when receiving the PDSCH before setting any dedicated upper layer among dmrs-AdditionalPosition, maxLength and dmrs-Type parameters, the terminal has a PDSCH mapping type B. In any symbol carrying the DM-RS except for the PDSCH with the allocation duration of 2 symbols, no PDSCH exists, and a single symbol of configuration type 1 on the DM-RS port 1000 front-loaded DM It is assumed that -RS is transmitted, and all remaining orthogonal antenna ports are not related to transmission of PDSCH to other terminals. Additionally,
  • the front-loaded DM-RS symbol is 1st of the PDSCH allocation duration interval.
  • the UE assumes that one additional single symbol DM-RS exists in the 5th or 6th symbol. Otherwise, the UE assumes that there is no additional DM-RS symbol.
  • the terminal assumes that there is no additional DM-RS,
  • the UE assumes that there is no additional DM-RS, and the UE assumes that the PDSCH exists in a symbol carrying the DM-RS.
  • the terminal may be set with the higher layer parameter dmrs-Type, and the configured DM-RS configuration type is used to receive the PDSCH.
  • the terminal may be set to the maximum number of front-loaded DM-RS symbols for the PDSCH by the upper layer parameter maxLength given by DMRS-DownlinkConfig.
  • the terminal may schedule the number of DM-RS ports by the antenna port index of DCI format 1_1.
  • FIG. 19 shows an example of a DMRS configuration type.
  • FIG. 19A shows DMRS configuration type 1
  • FIG. 19B shows DMRS configuration type 2.
  • the DMRS configuration type of FIG. 19 is set by the dmrs-Type parameter in the DMRS-DownlinkConfig IE of Table 15.
  • the DMRS configuration type 1 has a higher RS density in the frequency domain and supports up to 4 (8) ports for single (double)-symbol DMRS.
  • DMRS configuration type 1 supports length 2 F-CDM and FDM for single-symbol DMRS, and length 2 F/T-CDM and FDM for double-symbol DMRS.
  • DMRS configuration type 2 supports more DMRS antenna ports, and supports up to 6 (12) ports for single (double)-symbol DMRS.
  • Table 15 is a table showing an example of the DMRS-DownlinkConfig IE used to configure the downlink DMRS for the PDSCH.
  • the dmrs-AdditionalPosition parameter indicates the position of the additional DM-RS in the DL, and if the parameter does not exist, the terminal applies the pos2 value.
  • the Dmrs-Type parameter indicates selection of the DMRS type to be used for the DL, and if the parameter does not exist, the UE uses DMRS type 1.
  • the Max-Length parameter represents the maximum number of OFDM symbols for DL front loaded DMRS, and len1 corresponds to a value of 1.
  • the PhaseTrackingRS parameter sets the DL PTRS, and if the parameter does not exist or is canceled, it is assumed that the UE does not have a DL PTRS.
  • the antenna port mapping is allocated with indexes of ⁇ 2, 9, 10, 11 or 30 ⁇ , or when the terminal is scheduled with two codewords,
  • the UE may assume that all of the remaining orthogonal antenna ports are not related to transmission of the PDSCH to other UEs.
  • the UE may assume that all of the remaining orthogonal antenna ports are not related to transmission of the PDSCH to other UEs.
  • 20 is a flowchart illustrating an example of a DL DMRS procedure.
  • the base station transmits the DMRS configuration (configuration) information to the terminal (S110).
  • the DMRS configuration information may refer to a DMRS-DownlinkConfig IE.
  • the DMRS-DownlinkConfig IE may include a dmrs-Type parameter, a dmrs-AdditionalPosition parameter, a maxLength parameter, a phaseTrackingRS parameter, and the like.
  • the dmrs-Type parameter is a parameter for selecting a DMRS type to be used for DL.
  • the DMRS can be divided into two configuration types: (1) DMRS configuration type 1 and (2) DMRS configuration type 2.
  • DMRS configuration type 1 is a type having a higher RS density in the frequency domain
  • DMRS configuration type 2 is a type having more DMRS antenna ports.
  • the dmrs-AdditionalPosition parameter is a parameter indicating the position of an additional DMRS in the DL.
  • the first position of the front-loaded DMRS is determined according to the PDSCH mapping type (type A or type B), and an additional DMRS may be configured to support a high speed terminal.
  • the front-loaded DMRS occupies 1 or 2 consecutive OFDM symbols, and is indicated by RRC signaling and downlink control information (DCI).
  • the maxLength parameter is a parameter indicating the maximum number of OFDM symbols for DL front-loaded DMRS.
  • the phaseTrackingRS parameter is a parameter for configuring DL PTRS.
  • the base station generates a sequence used for DMRS (S120).
  • the sequence for the DMRS is generated according to Equation 8 below.
  • the pseudo-random sequence Is defined in 3gpp TS 38.211 5.2.1. In other words, May be a length-31 gold sequence using two m-sequences.
  • the pseudo-random sequence generator is initialized by Equation 9 below.
  • Is the number of OFDM symbols in the slot Is the slot number in the frame.
  • Is if provided, and the PDSCH is scheduled by PDCCH using DCI format 1_1 with CRC scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI, higher-layer parameter in DMRS-DownlinkConfig IE They are given by scramblingID0 and scramblingID1, respectively.
  • the base station maps the generated sequence to a resource element (S130).
  • the resource element may mean including at least one of time, frequency, antenna port, or code.
  • the base station transmits the DMRS to the terminal on the resource element (S140).
  • the terminal receives the PDSCH using the received DMRS.
  • a DMRS-related operation for PUSCH reception will be described.
  • UL refers to signal transmission (or communication) from a terminal to a base station.
  • the UL DMRS-related operation is similar to the Salpin DL DMRS-related operation, and names of parameters related to DL may be replaced with names of parameters related to UL.
  • the DMRS-DownlinkConfig IE may be replaced with a DMRS-UplinkConfig IE
  • the PDSCH mapping type may be replaced with a PUSCH mapping type
  • the PDSCH may be replaced with a PUSCH.
  • the base station may be replaced by a terminal and the terminal may be replaced by a base station.
  • Sequence generation for UL DMRS may be defined differently depending on whether transform precoding is enabled.
  • the DMRS uses a PN sequence when CP-OFDM (cyclic prefix orthogonal frequency division multiplexing) is used (or when transform precoding is not enabled), and a Discrete Fourier Transform-spread-spread-DFT-s-OFDM OFDM) (when transform precoding is enabled), a ZC sequence having a length of 30 or more is used.
  • Table 16 is a table showing an example of a DMRS-UplinkConfig IE used to configure an uplink DMRS for PUSCH.
  • the dmrs-AdditionalPosition parameter indicates the position of the additional DM-RS in the UL, and if the parameter does not exist, the terminal applies the pos2 value.
  • the Dmrs-Type parameter indicates selection of a DMRS type to be used for UL, and if the corresponding parameter does not exist, the UE uses DMRS type 1.
  • the Max-Length parameter represents the maximum number of OFDM symbols for UL front loaded DMRS, and len1 corresponds to a value of 1.
  • the PhaseTrackingRS parameter configures UL PTRS.
  • the tranformPrecodingdisabled parameter indicates DMRS related parameters for Cyclic Prefix OFDM
  • the transformPrecodingEnabled parameter indicates DMRS related parameters for DFT-s-OFDM (Transform Precoding).
  • the terminal is a DM-RS In port 0, a single symbol front-loaded DM-RS of configuration type 1 is used, and the remaining REs not used for the DM-RS in the symbols are allocated OFDM symbols of 2 or less with disabled transform precoding It is not used for any PUSCH transmission except for a PUSCH having a duration period.
  • the additional DM-RS may be transmitted according to a scheduling type and a PUSCH duration period in consideration of whether frequency hopping is enabled.
  • the terminal assumes that dmrs-AdditionalPosition is equal to'pos2' and that up to two additional DM-RSs can be transmitted according to the PUSCH duration.
  • the terminal assumes that dmrs-AdditionalPosition is equal to'pos1' and that at most one additional DM-RS can be transmitted according to the PUSCH duration.
  • the terminal of the configuration type provided by the upper layer parameter dmrs-Type of configuredGrantConfig on DM-RS port 0 A single symbol front-loaded DM-RS is used, and the remaining REs that are not used for the DM-RS in the symbols are PUSCH having an allocation duration interval of two or less OFDM symbols with disabled transform precoding. It is not used for any PUSCH transmission except for, and an additional DM-RS having dmrs-AdditionalPosition from configuredGrantConfig may be transmitted based on a scheduling type and a PUSCH duration in consideration of whether frequency hopping is enabled.
  • the transmitted PUSCH is scheduled according to DCI format 0_1 with CRC scrambled by C-RNTI, CS-RNTI or MCS-RNTI or corresponds to a configured grant,
  • the terminal may be set as the higher layer parameter dmrs-Type in DMRS-UplinkConfig, and the configured DM-RS configuration type is used for PUSCH transmission.
  • the terminal may be set to the maximum number of front-loaded DM-RS symbols for the PUSCH by the upper layer parameter maxLength in the DMRS-UplinkConfig.
  • the UE transmitting the PUSCH is set to the upper layer parameter phaseTrackingRS in the DMRS-UplinkConfig, the UE may assume that the following settings do not occur simultaneously for the transmitted PUSCH.
  • any of 4-7 or 6-11 DM-RS ports are scheduled for each UE, and PT-RS is transmitted from the UE.
  • the UE For PUSCH scheduled according to DCI format 0_1, by activation DCI format 0_1 with CRC scrambled by CS-RNTI or by setting grant type 1, the UE does not use a DM-RS CDM group for data transmission. I assume it does.
  • phase noise causes common phase error (CPE) and inter-carrier interference (ICI) in the frequency domain.
  • CPE common phase error
  • ICI inter-carrier interference
  • PTRS was defined in NR to estimate and compensate for this CPE.
  • 21 is a flowchart illustrating an example of a DL PTRS procedure.
  • the base station transmits PTRS configuration information to the terminal (S110).
  • the PTRS configuration information may refer to PTRS-DownlinkConfig IE.
  • the PTRS-DownlinkConfig IE may include a frequencyDensity parameter, a timeDensity parameter, an epre-Ratio parameter, a resourceElementOffset parameter, and the like.
  • the frequencyDensity parameter is a parameter representing the presence and frequency density of the DL PTRS as a function of the scheduled BW.
  • the timeDensity parameter is a parameter representing the existence and time density of DL PTRS as a function of a modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • the epre-Ratio parameter is a parameter indicating an energy per resource element (EPRE) between PTRS and PDSCH.
  • EPRE energy per resource element
  • the base station generates a sequence used for PTRS (S120).
  • the sequence for the PTRS is generated using the DMRS sequence of the same subcarrier as shown in Equation 4.1C-3 below.
  • Sequence generation for PTRS may be defined differently depending on whether transform precoding is enabled, and Equation 10 below shows an example of a case in which transform precoding is disabled.
  • the PTRS sequence uses the DMRS sequence, but more specifically, the PTRS sequence in subcarrier k is the same as the DMRS sequence in subcarrier k.
  • the base station maps the generated sequence to a resource element (S130).
  • the resource element may mean including at least one of time, frequency, antenna port, or code.
  • the position of the PTRS in the time domain is mapped at a specific symbol interval starting from the start symbol of PDSCH allocation. If a DMRS symbol exists, mapping is performed from a symbol following the corresponding DMRS symbol.
  • the specific symbol interval may be 1, 2 or 4 symbols.
  • the frequency position of the PTRS is determined by the frequency position of the associated DMRS port and the higher layer parameter UL-PTRS-RE-offset.
  • the UL-PTRS-RE-offset is included in the PTRS configuration, and indicates a subcarrier offset for UL PTRS for CP-OFDM.
  • the PTRS port is associated with the DMRS port of the lowest index among the scheduled DMRS ports.
  • the base station configures which DMRS port is associated with the PTRS port through UL DCI.
  • the base station transmits the PTRS to the terminal on the resource element (S140).
  • the terminal compensates for the phase noise using the received PTRS.
  • the UL PTRS-related operation is similar to the Salpin UL PTRS-related operation, and names of parameters related to DL may be replaced with names of parameters related to UL.
  • the PTRS-DownlinkConfig IE may be replaced with a PTRS-UplinkConfig IE, and in a DL PTRS-related operation, the base station may be replaced with the terminal, and the terminal may be replaced with the base station.
  • sequence generation for PTRS may be defined differently depending on whether transform precoding is enabled.
  • TRS is defined in the NR for the function of the cell-specific reference singal (CRS) used for fine time and frequency tracking in the LTE system.
  • CRS cell-specific reference singal
  • the TRS defined in NR is not always-on, unlike the CRS of the LTE system.
  • the UE can estimate timing offset, delay spread, frequency offset, and Doppler spread.
  • the TRS is supported in both below 6GHz (FR1) and above 6GHz (FR2).
  • Periodic TRS is mandatory in both FR1 and FR2, and aperiodic TRS is optional in both FR1 and FR2.
  • FIG. 22 is a flowchart illustrating an example of a TRS procedure.
  • the terminal receives the NZP-CSI-RS-ResourceSet IE (information element) including the trs-Info parameter from the base station (S110).
  • the trs-Info parameter is a parameter indicating whether the antenna ports for all NZP-CSI-RS resources in the CSI-RS resource set are the same, and is set in units of NZP-CSI-RS resource set.
  • CSI-RS resources in the CSI-RS resource set in which the trs-Info parameter is set to'ON' are set as 1-port CSI-RS resources.
  • Periodic CSI-RS resources in the CSI-RS resource set in which the trs-Info parameter is set to'ON' have the same period, bandwidth, and subcarrier location.
  • the aperiodic CSI-RS resources in the CSI-RS resource set in which the trs-Info parameter is set to'ON' have the same bandwidth and the same number of CSI-RS resources having the same RB location.
  • the QCL reference of the TRS must be associated with the periodic TRS, and the QCL types are'QCL-Type-A' and'QCL-TypeD'.
  • the terminal performs time and/or frequency tracking through CSI-RS resources in the CSI-RS resource set in which the trs-Info is set to “ON” (S120).
  • FIG. 23 is a flowchart illustrating an example of a downlink transmission/reception operation to which the method proposed in this specification can be applied.
  • the base station schedules downlink transmission such as a frequency/time resource, a transport layer, a downlink precoder, and an MCS (S1710).
  • the base station may determine a beam for PDSCH transmission to the terminal through the above-described operations.
  • the terminal receives downlink control information (DCI: Downlink Control Information) for downlink scheduling (ie, including scheduling information of PDSCH) from the base station on the PDCCH (S1720).
  • DCI Downlink Control Information
  • DCI format 1_0 or 1_1 may be used for downlink scheduling, and in particular, DCI format 1_1 includes the following information: DCI format identifier (Identifier for DCI formats), bandwidth part indicator (Bandwidth part indicator), frequency domain Resource allocation (Frequency domain resource assignment), time domain resource assignment (Time domain resource assignment), PRB bundling size indicator (PRB bundling size indicator), rate matching indicator (Rate matching indicator), ZP CSI-RS trigger (ZP CSI-RS trigger), antenna port(s) (Antenna port(s)), transmission configuration indication (TCI), SRS request, Demodulation Reference Signal (DMRS) sequence initialization (DMRS sequence initialization)
  • DCI format identifier Identifier for DCI formats
  • bandwidth part indicator Bandwidth part indicator
  • frequency domain Resource allocation Frequency domain resource assignment
  • time domain resource assignment time domain resource assignment
  • PRB bundling size indicator PRB bundling size indicator
  • rate matching indicator Rate matching indicator
  • ZP CSI-RS trigger ZP CSI-RS
  • the number of DMRS ports may be scheduled according to each state indicated in the antenna port(s) field, and also single-user (SU)/multi-user (MU) transmission Scheduling is possible.
  • SU single-user
  • MU multi-user
  • the TCI field is composed of 3 bits, and the QCL for the DMRS is dynamically indicated by indicating a maximum of 8 TCI states according to the value of the TCI field.
  • the terminal receives downlink data from the base station on the PDSCH (S1730).
  • the PDSCH is decoded according to an indication by the corresponding DCI.
  • the UE when the UE receives the PDSCH scheduled according to DCI format 1, the UE may set the DMRS configuration type according to the higher layer parameter'dmrs-Type', and the DMRS type is used to receive the PDSCH.
  • the terminal may set the maximum number of front-loaded DMRA symbols for the PDSCH by the higher layer parameter'maxLength'.
  • DMRS configuration type 1 when a single codeword is scheduled in the terminal and an antenna port mapped with an index of ⁇ 2, 9, 10, 11 or 30 ⁇ is specified, or when two codewords are scheduled in the terminal, the terminal Assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another terminal.
  • a precoding unit (precoding granularity) P′ is a consecutive resource block in the frequency domain.
  • P' may correspond to one of ⁇ 2, 4, broadband ⁇ .
  • the terminal does not expect to be scheduled with non-contiguous PRBs, and the terminal can assume that the same precoding is applied to the allocated resources.
  • a precoding resource block group PRG is divided into P'consecutive PRBs.
  • the actual number of consecutive PRBs in each PRG may be one or more.
  • the UE may assume that the same precoding is applied to consecutive downlink PRBs in the PRG.
  • the UE In order for the UE to determine the modulation order, target code rate, and transport block size in the PDSCH, the UE first reads a 5-bit MCD field in the DCI, and modulates the order and target code. Determine the rate. Then, the redundancy version field in the DCI is read, and the redundancy version is determined. Then, the UE determines the transport block size using the number of layers and the total number of allocated PRBs before rate matching.
  • 24 is a flowchart illustrating an example of an uplink transmission/reception operation to which the method proposed in the present specification can be applied.
  • the base station schedules uplink transmission such as a frequency/time resource, a transport layer, an uplink precoder, and MCS (S1810).
  • the base station may determine a beam for PUSCH transmission by the terminal through the above-described operations.
  • the UE receives the DCI for uplink scheduling (ie, including scheduling information of the PUSCH) from the base station on the PDCCH (S1820).
  • DCI format 0_0 or 0_1 may be used for uplink scheduling, and in particular, DCI format 0_1 includes the following information: DCI format identifier (Identifier for DCI formats), UL/SUL (Supplementary uplink) indicator (UL/ SUL indicator), bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS) : Modulation and coding scheme), SRS resource indicator (SRI), precoding information and number of layers, antenna port(s) (Antenna port(s)), SRS request (SRS request), DMRS sequence initialization, UL-SCH (Uplink Shared Channel) indicator (UL-SCH indicator)
  • SRS resources set in the SRS resource set associated with the upper layer parameter'usage' may be indicated by the SRS resource indicator field.
  • SRS resource indicator field may indicate SRS resource indicator field.
  • patialRelationInfo' can be set for each SRS resource, and its value can be one of ⁇ CRI, SSB, SRI ⁇ .
  • the terminal transmits uplink data to the base station on the PUSCH (S1830).
  • the UE When the UE detects a PDCCH including DCI format 0_0 or 0_1, it transmits a corresponding PUSCH according to an indication by the corresponding DCI.
  • codebook-based transmission For PUSCH transmission, two transmission schemes are supported: codebook-based transmission and non-codebook-based transmission:
  • the PUSCH may be scheduled in DCI format 0_0, DCI format 0_1, or semi-statically.
  • the UE transmits PUSCH based on SRI, Transmit Precoding Matrix Indicator (TPMI) and transmission rank from DCI, as given by the SRS resource indicator field and the Precoding information and number of layers field.
  • TPMI Transmit Precoding Matrix Indicator
  • the TPMI is used to indicate the precoder to be applied across the antenna port, and corresponds to the SRS resource selected by the SRI when multiple SRS resources are configured.
  • the TPMI is used to indicate a precoder to be applied across the antenna port, and corresponds to the single SRS resource.
  • a transmission precoder is selected from an uplink codebook having the same number of antenna ports as the upper layer parameter'nrofSRS-Ports'.
  • the terminal is configured with at least one SRS resource.
  • the SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH carrying the SRI (ie, slot n).
  • the PUSCH may be scheduled in DCI format 0_0, DCI format 0_1, or semi-statically.
  • the UE can determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI is given by the SRS resource indicator in the DCI or by the upper layer parameter'srs-ResourceIndicator'. Is given.
  • the UE uses one or multiple SRS resources for SRS transmission, where the number of SRS resources may be set for simultaneous transmission within the same RB based on UE capability. Only one SRS port is configured for each SRS resource.
  • Only one SRS resource may be set to the upper layer parameter'usage' set to'nonCodebook'.
  • the maximum number of SRS resources that can be configured for non-codebook-based uplink transmission is 4.
  • the SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH carrying the SRI (ie, slot n).
  • the size of the DFT vector may be larger than the dimension size of information related to the spatial domain (SD)/frequency domain (FD)/time domain (TD) used for actual CSI reporting.
  • SD spatial domain
  • FD frequency domain
  • TD time domain
  • the size of the actual DFT vector is 14, and according to the above rule (product of powers of 2, 3 and/or 5), a codebook must be constructed using a DFT vector of length 15. Due to this, ambiguity due to dimension mismatch occurs. In order to resolve such ambiguity, this specification is applied when the size of the DFT vector is larger than the dimension size of information related to the spatial domain (SD)/frequency domain (FD)/time domain (TD) used for actual CSI reporting.
  • SD spatial domain
  • FD frequency domain
  • TD time domain
  • a signaling scheme and a terminal/base station operation (UE/BS behavior) for setting (or indicating or supporting) a padding scheme are proposed.
  • Discrete Fourier Transform may be replaced (or changed) applied to Discrete Cosine Transform (DCT).
  • N is the number of SB CQI subbands.
  • N SB is the number of CQI subbands.
  • Alt1 N 3 is the smallest multiple of 2, 3 or 5 with ⁇ N SB ⁇ R.
  • N 3 is a multiple of 2, 3, or 5. Segment into 2 parts with overlapping between 2 parts. No padding is required to fit the DFT size to a multiple of 2, 3, or 5.
  • the dimension of information eg, 2*N1*N2 or N3 related to spatial domain (SD)/frequency domain (FD)/time domain (TD) used for CSI reporting
  • SD spatial domain
  • FD frequency domain
  • TD time domain
  • Y the size of the DFT vector used for the codebook configuration
  • TD time domain
  • CSI information for (YX) is reported by the base station and the terminal in advance or a rule set (or applied) by the base station or the terminal.
  • a codebook can be constructed using a padding technique based on one method.
  • N1, N2 and N3 are as follows.
  • N1 number of antenna ports in the first spatial domain (# of antenna port in 1st spatial domain (e.g., horizontal domain))
  • N2 number of antenna ports in 2nd spatial domain (e.g., vertical domain)
  • N3 Number of frequency domain units in Rel-16 Type II CSI (# of frequency domain unit in Rel-16 Type II CSI)
  • the first embodiment can also be applied to SD/TD, but hereinafter, for convenience of explanation, a description will be made focusing on a codebook related to FD.
  • the sub-band size is defined as shown in Table 17 below according to the number of physical resource blocks (PRBs) constituting the set bandwidth part (BWP).
  • PRBs physical resource blocks
  • BWP set bandwidth part
  • N3 is the smallest multiple of 2, 3 or 5 greater than or equal to NSB*R
  • Table 18 the actual N SB *R and the DFT based on Table 18
  • the maximum difference from size has a value of 1 or 2.
  • N SB is the number of SBs
  • R is a scaling parameter used to determine the frequency unit size
  • Table 18 shows the possible DFT lengths (N SB *R>13).
  • FIG. 25(a) it is a method of considering padding before the set first CSI reporting SB, in the case of FIG.
  • padding is zero-padding
  • CSI measured based on CSI-RS is interpolated (eg, in the case of FIG. 25(c), it can be configured by interpolating CSI of SB7 and SB8) or CSI calculated by extrapolation, etc. It refers to a method of padding information to the corresponding frequency position.
  • zero-padding is applied as shown in FIG. 25(b), the same effect as oversampling may be obtained.
  • the terminal and the base station may perform codebook configuration and decoding using a padding technique based on a rule set (or applied) by the base station or a rule set by the base station or reported by the base station. .
  • the padding portion may occur in two places as described above, so that more implementation patterns may be implemented.
  • FIG. 26(a) a method of considering padding for two PMI values before the set first CSI reporting SB
  • FIG. 26(b) a method for considering padding for two PMI values after the set last CSI reporting SB
  • Fig. 26(c) a method of performing padding for one PMI value, respectively, before and after the set SB.
  • FIGS. 26(d) and 26(e) show two PMI values in the middle of the set SB.
  • the embodiments of FIGS. 26(d) and 26(e) show a pattern in which the positions of padding are uniformly distributed.
  • the position of the padding may be determined by Equation 11 below.
  • Equation 12 Equation 12
  • Equation 13 Equation 13
  • Equation 14 Equation 14
  • Patterns represented by the above examples may be promised in advance, and in the case of zero-padding, when the reporting SB indicated by RRC (signaling) is continuous, its performance may be good (due to the effect of oversampling). If the reporting SB indicated by RRC (signaling) is discontinuous, it may be promised to use a padding scheme that uses an interpolation/extrapolation method instead of zero-padding. That is, the padding scheme may be applied differently by the information of the reporting SB indicated by RRC (signaling).
  • the terminal may report information on the most preferred pattern (eg, bit-map) and/or any padding scheme (zero-padding or extrapolation-based or interpolation-based) information to the base station among the patterns.
  • the information on the pattern may be included in Part 2 CSI.
  • the base station transmits the configuration information related to the padding pattern and/or padding scheme to the terminal to the terminal.
  • the terminal reports to the base station on its preferred padding pattern and/or padding scheme.
  • the padding pattern may be preset by the base station to the terminal or the terminal may report to the base station.
  • the padding scheme may be promised in advance to apply zero padding when the reporting SB indicated by the base station is continuous, and to apply interpolation/extrapolation when the reporting SB is discontinuous.
  • extrapolation may be applied when the padding position is located at both ends of the (reported) sub-band, and interpolation may be applied when the padding is located between each sub-band (reported).
  • D If the DFT vector is used as it is (without combining) as in Type I CSI, interpolation or extrapolation of simple indices may be used.
  • the CSI (e.g., PMI) corresponding to the padding position may be used by copying the CSI value of the nearest SB or the nearest frequency domain as it is.
  • the meaning of nearest SB or frequency domain is, for example, a position of a frequency domain corresponding to an index that is +1 or -1 than the frequency index of the padding position, or to an index that adds or subtracts a predetermined value.
  • the base station is set to a higher layer (eg, RRC signaling or MAC CE) or dynamic signaling (eg, DCI) to the terminal (or Instruction).
  • a higher layer eg, RRC signaling or MAC CE
  • dynamic signaling eg, DCI
  • Whether to apply the padding scheme in the first embodiment is defined when the value of a specific N SB *R is greater than or equal to a specific value. This is large in order to reduce the implementation complexity of the terminal, but in the case of the second embodiment, the base station may indicate whether to apply the padding scheme to the terminal for the purpose of monitoring the flexibility of scheduling and the channel condition of the terminal. For example, as in the TS 38.331 spec of Table 19 below, the base station instructs the terminal to information about a specific SB to which the terminal will report CSI in a bitmap manner.
  • the terminal when the base station instructs the terminal to use Rel-16 Type II CSI (by RRC (signaling) or MAC CE or DCI), and reports CSI with Rel-16 Type II CSI, the terminal is “csi-ReportingBand Ignoring the information indicated by "(eg csi-ReportingBand in Table 19), it is assumed that the N SB value is always the maximum size of the DL BWP set in the terminal, and N 3 is calculated.
  • the location of the SB / frequency domain to perform padding or inter-/extra-polation operation is implicitly determined according to the reporting band configuration set by the base station in the terminal.
  • the N3 value set in the terminal is more than a specific value (eg, 13)
  • the Rel-16 Type II CSI may occupy a larger CSI processing unit (CPU) than the Rel-15 Type II CSI (e.g., 2 CPU).
  • Rel-16 Type II CSI is a case in which only ranks 1 and 2 can be reported when it is possible to report rank 3-4 by an indicator (eg, ri-Restriction, typeII-RI-Restriction) indicated by RI restriction.
  • the CSI processing unit can occupy a larger value (eg, 2CPU).
  • typeII-RI-Restriction is indicated as “1100” with 4 bits (in this case, transmission up to rank 2) is indicated as “1111” (in this case, transmission up to rank 4 is possible)
  • Value can occupy the CPU.
  • the embodiment 3-3 it is assumed that a high-capability (advanced) terminal occupies the same number of CPUs regardless of the rank to be reported.
  • the third embodiment, the 3-1 embodiment, and the 3-2 embodiment may be each or a combination thereof.
  • CSI processing criteria can be briefly described as follows.
  • Embodiment 1 / Embodiment 2 / Embodiment 2-1 / Embodiment 3 / Embodiment 3-1 / Embodiment 3-2 / Embodiment 3-3
  • PUCCH Physical Uplink Control Channel
  • FIGS. 27 and 28 are for convenience of description and do not limit the scope of the present invention.
  • some of the steps described in FIGS. 27 and 28 may be merged or omitted.
  • the above-described CSI-related operation may be considered/applied.
  • FIG. 27 shows a flow chart of an operation of a base station performing a CSI procedure based on the above proposals.
  • the base station provides system information (SI) and/or scheduling information and/or CSI related Configuration (eg CSI reporting setting, CSI-RS resource setting, etc.) as a higher layer (eg, RRC or MAC CE) to the terminal.
  • SI system information
  • CSI related Configuration eg CSI reporting setting, CSI-RS resource setting, etc.
  • a higher layer eg, RRC or MAC CE
  • the CSI related configuration is based on the above-described proposed methods (eg 1st embodiment / 2nd embodiment / 2-1 embodiment / 3rd embodiment / 3-1 embodiment / 3-2 implementation).
  • Yes / CSI-related information eg padding pattern / padding scheme / indicator indicated by RI restriction / Type I CSI feedback related setting / Type II CSI feedback related setting
  • Etc. e.g padding pattern / padding scheme / indicator indicated by RI restriction / Type I CSI feedback related setting / Type II CSI feedback related setting
  • the base station may transmit an RS (e.g., SSB/CSI-RS/TRS/PT-RS) to the terminal in order to receive the channel status report of the terminal (D10).
  • the base station may transmit the MAC-CE related to the indication of CSI reporting to the terminal (D15).
  • the MAC-CE may include information related to the trigger of the corresponding AP CSI reporting, and the corresponding AP CSI reporting may be triggered through additional triggering DCI (eg, see CSI reporting). ).
  • the MAC-CE may include information for activation/deactivation of the corresponding SP CSI reporting (see e.g. CSI reporting).
  • steps D10 and D15 may be changed in order or merged into one step.
  • the base station may report and receive the channel state CSI (e.g., CRI/RI/CQI/PMI/LI) from the terminal (D20).
  • the BS may receive AP CSI reporting based on trigger-related information included in the MAC-CE from the UE, or may receive SP CSI reporting activated by the MAC-CE.
  • the base station uses the above-described proposed methods (eg, the first embodiment / the second embodiment / the 2-1 embodiment / the third embodiment / the 3-1 embodiment / the 3-2 embodiment / the third embodiment).
  • 3-3 The CSI determined/calculated based on the embodiment) may be reported from the terminal.
  • the base station may determine/calculate data scheduling and precoding based on the CSI reported from the terminal (and/or the CSI reported from the terminal and a situation in which the base station serves other terminals) (D25), and the precoding RS (eg DMRS, TRS, PT-RS) for applied data and data decoding may be transmitted to the (scheduled) terminal (D30).
  • the precoding RS eg DMRS, TRS, PT-RS
  • step D30 may not be considered an essential step of the present invention.
  • the UE transmits system information (SI) and/or scheduling information and/or CSI related Configuration (eg CSI reporting setting, CSI-RS resource setting, etc.) to a higher layer (eg, RRC or MAC CE) from the base station.
  • SI system information
  • CSI related Configuration eg CSI reporting setting, CSI-RS resource setting, etc.
  • a higher layer eg, RRC or MAC CE
  • the CSI related configuration is based on the above-described proposed methods (eg 1st embodiment / 2nd embodiment / 2-1 embodiment / 3rd embodiment / 3-1 embodiment / 3-2 implementation).
  • Yes / CSI-related information eg padding pattern / padding scheme / indicator indicated by RI restriction / Type I CSI feedback related setting / Type II CSI feedback related setting
  • Etc. eg padding pattern / padding scheme / indicator indicated by RI restriction / Type I CSI feedback related setting / Type II CSI feedback related setting
  • the UE may receive an RS (e.g., SSB/CSI-RS/TRS/PT-RS) related to the channel status report from the base station (E10).
  • the terminal may receive the MAC-CE related to the indication of CSI reporting from the base station (E15).
  • the MAC-CE may include information related to the trigger of the corresponding AP CSI reporting, and the corresponding AP CSI reporting may be triggered through additional triggering DCI (eg, see CSI reporting). ).
  • the MAC-CE may include information for activation/deactivation of the corresponding SP CSI reporting (see e.g. CSI reporting).
  • steps D10 and D15 may be changed in order or merged into one step.
  • the UE determines/calculates CSI based on information set from the RS and the base station (eg CSI related Configuration, information of reporting setting/information indicated by DCI, etc.), and may report the CSI to the base station. (E25).
  • the UE may transmit AP CSI reporting based on trigger related information included in the MAC-CE to the BS, or may transmit SP CSI reporting activated by the MAC-CE.
  • the UE determines/calculates the above-described proposed methods (eg, Embodiment 1 / Embodiment 2 / Embodiment 2-1 / Embodiment 3 / Embodiment 3-1 / Embodiment 3) Embodiment 3-2 / Embodiment 3-3) can be applied, and information (eg CQI, PMI, RI, LI, etc.) included in the reported CSI is also included in the above-described proposed methods (eg Embodiment 1 / The second embodiment / the 2-1 embodiment / the third embodiment / the 3-1 embodiment / the 3-2 embodiment / the 3-3 embodiment).
  • the terminal may receive data/RS (for data decoding) according to Data Scheduling information from the base station (E30).
  • data scheduling and precoding to be applied to data may be determined/calculated by the base station based on the CSI reported by the UE, but may not be considered only the CSI reported by the UE.
  • step E30 may not be considered an essential step of the present invention.
  • the above-described proposed methods for the operation of the base station and/or the terminal may be implemented by an apparatus (eg, Figs. 30 to 34) to be described below.
  • a base station may correspond to a transmitting device
  • a terminal may correspond to a receiving device, and vice versa may be considered.
  • 29 is a flow chart illustrating another example of a method of operating a terminal proposed in the present specification.
  • FIG. 29 relates to a method of reporting channel state information (CSI) by a terminal in a wireless communication system.
  • CSI channel state information
  • the terminal receives from the base station control information related to the determination of the dimension size for a specific domain used for CSI reporting (S2910).
  • the CSI may be CSI based on linear combining, and in particular, may be Type II CSI.
  • the specific region may be at least one of a spatial domain, a frequency domain, and a time domain.
  • the control information may include information on a bandwidth part (BWP) and information on a subband size.
  • the CSI may include a precoding matrix indicator (PMI).
  • the dimensional size may be determined as a product of the number of subbands and a scaling parameter used to determine a frequency unit size.
  • the terminal receives configuration information related to padding to be applied to one or more subbands for the CSI report from the base station (S2920).
  • the setting information may include information on a padding pattern and information on a padding scheme.
  • the UE compares the size of a dimension determined based on the control information with the size of a Discrete Fourier Transform (DFT) vector used for configuring a codebook (S2930).
  • DFT Discrete Fourier Transform
  • the size of the DFT vector may be determined based on a preset rule.
  • the UE determines a padding pattern and a padding scheme to be applied to a subband equal to a difference between the size of the DFT vector and the size of the dimension (S2940).
  • the padding pattern and the padding scheme may be determined when the size of the DFT vector is larger than the dimension size.
  • the size of the DFT vector may be greater than 13.
  • the padding pattern is related to the position of the subband to which the padding is applied, and the position of the subband to which the padding is applied is before the subband for initial CSI reporting, after the subband for last CSI reporting, or a set CSI It may be in the middle of subbands for reporting.
  • the position of the subband to which the padding is applied is before the subband for initial CSI reporting, after the subband for last CSI reporting, or a set CSI It may be in the middle of subbands for reporting.
  • the padding scheme may be zero padding, interpolation-based padding for CSI measured based on CSI-RS, or extrapolation-based padding for CSI measured based on CSI-RS.
  • the zero padding is applied, and when the subbands for the CSI reporting are discontinuously configured, the interpolation-based or extrapolation-based padding may be applied.
  • the terminal reports the CSI to the base station based on the padding pattern and the padding scheme (S2950).
  • downlink refers to communication from a base station to a terminal
  • uplink refers to 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 referred to as a first communication device, and the terminal may be referred to as a second communication device.
  • Base station is a fixed station, Node B, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G).
  • BS Base station
  • eNB evolved-NodeB
  • gNB Next Generation NodeB
  • BTS base transceiver system
  • AP access point
  • 5G network
  • AI Artificial Intelligence
  • RSU road side unit
  • robot drone
  • UAV Unmanned Aerial Vehicle
  • AR Augmented Reality
  • VR Virtual Reality
  • the terminal may be fixed or mobile, and UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile) Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), It can be replaced with terms such as robot, AI (Artificial Intelligence) module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device.
  • the transmitting device and the receiving device may be a base station or a terminal, respectively.
  • the transmitting device 10 and the receiving device 20 are transceivers 13 and 23 capable of transmitting or receiving wireless signals carrying information and/or data, signals, messages, etc., and various information related to communication within a wireless communication system. Is connected to components such as memories 12 and 22, the transceivers 13 and 23, and the memories 12 and 22, and controls the components so that the corresponding device is one of the above-described embodiments of the present invention.
  • Each of the processors 11 and 21 may be configured to control the memories 12 and 22 and/or the transceivers 13 and 23 to perform at least one.
  • the memories 12 and 22 may store programs for processing and control of the processors 11 and 21, and may temporarily store input/output information.
  • the memories 12 and 22 can be utilized as buffers.
  • the processors 11 and 21 generally control the overall operation of various modules in the transmitting device or the receiving device. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention.
  • the processors 11 and 21 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like.
  • the processors 11 and 21 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 configured to perform the present invention field programmable gate arrays
  • firmware or software when the present invention is implemented using firmware or software, firmware or software may be configured to include a module, procedure, or function that performs functions or operations of the present invention, and configured to perform the present invention.
  • Firmware or software may be provided in the processors 11 and 21 or stored in the memories 12 and 22 and driven by the processors 11 and 21.
  • the processor 11 of the transmission device 10 may perform predetermined coding and modulation on a signal and/or data to be transmitted to the outside and then transmit it to the transceiver 13.
  • the processor 11 may generate a codeword through demultiplexing, channel encoding, scrambling, and modulation processes to be transmitted.
  • the codeword may include information equivalent to a transport block, which is a data block provided by the MAC layer.
  • One transport block (TB) may be encoded with one codeword.
  • Each codeword may be transmitted to a receiving device through one or more layers.
  • the transceiver 13 may include an oscillator.
  • the transceiver 13 may include one or a plurality of transmit antennas.
  • the signal processing process of the reception device 20 may be configured as the reverse of the signal processing process of the transmission device 10.
  • the transceiver 23 of the receiving device 20 can receive a radio signal transmitted by the transmitting device 10.
  • the transceiver 23 may include one or a plurality of receive antennas.
  • the transceiver 23 may frequency down-convert each of the signals received through the reception antenna and restore a baseband signal.
  • the transceiver 23 may include an oscillator for frequency down conversion.
  • the processor 21 may perform decoding and demodulation of a radio signal received through a receiving antenna to restore data originally intended to be transmitted by the transmitting device 10.
  • the transceivers 13 and 23 may include one or a plurality of antennas.
  • the antenna transmits a signal processed by the transceivers 13 and 23 to the outside, or receives a radio signal from the outside, according to an embodiment of the present invention under the control of the processors 11 and 21, It can perform the function of passing to ).
  • the antenna may also be referred to as an antenna port.
  • Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna element. The signal transmitted from each antenna can no longer be decomposed by the receiving device 20.
  • a reference signal (RS) transmitted corresponding to the antenna defines an antenna viewed from the viewpoint of the receiving device 20, and whether the channel is a single radio channel from one physical antenna or includes the antenna Regardless of whether the channel is a composite channel from a plurality of physical antenna elements, the reception device 20 may enable channel estimation for the antenna. That is, the antenna may be defined so that a channel through which a symbol on the antenna is transmitted can be derived from the channel through which another symbol on the same antenna is transmitted. In the case of a transceiver supporting a multi-input multi-output (MIMO) function for transmitting and receiving data using a plurality of antennas, it may be connected to two or more antennas.
  • MIMO multi-input multi-output
  • a single transmission device 10 having a structure in which a plurality of transmitters 13 are controlled by a single processor 11 or a transmitter 13 composed of a plurality of antennas
  • a single transmission device 10 configured with may transmit a signal to the single reception device 20, and a transmission panel may be configured in units of antennas (groups) within each Transceiver or Transceiver.
  • each transmission panel When a plurality of antennas are mounted on each transmission panel, input signals to elements (eg phase shifters, power amplifiers) for controlling the phase (and magnitude) of signals transmitted from each antenna to form a transmission beam from each panel Can be configured, and a separate processor for controlling input values (eg phase shift values) for the elements is mounted or a single processor inputs control signals for input values for the elements.
  • elements eg phase shifters, power amplifiers
  • a separate processor for controlling input values (eg phase shift values) for the elements is mounted or a single processor inputs control signals for input values for the elements.
  • the structure of the transmitting device and the structure of the receiving device may be configured correspondingly. That is, one transmission panel may correspond to one reception panel, and in this case, an antenna of each panel may serve as both a transmission and reception antenna.
  • signal processing may be performed in a processor of the base station/terminal such as the processor 11 of FIG. 30.
  • a transmission device 10 in a terminal or a base station includes a scrambler 301, a modulator 302, a layer mapper 303, an antenna port mapper 304, a resource block mapper 305, and a signal generator 306. ) Can be included.
  • the transmission device 10 may transmit one or more codewords. Coded bits in each codeword are each scrambled by the scrambler 301 and transmitted on a physical channel.
  • the codeword may be referred to as a data string, and may be equivalent to a transport block, which is a data block provided by the MAC layer.
  • the scrambled bits are modulated by the modulator 302 into complex-valued modulation symbols.
  • the modulator 302 modulates the scrambled bits according to a modulation method and may be arranged as a complex modulation symbol representing a position on a signal constellation. There is no restriction on the modulation scheme, and m-Phase Shift Keying (m-PSK) or m-Quadrature Amplitude Modulation (m-QAM) may be used for modulation of the encoded data.
  • m-PSK m-Phase Shift Keying
  • m-QAM m-Quadrature Amplitude Modulation
  • the modulator may be referred to as a modulation mapper.
  • the complex modulation symbol may be mapped to one or more transport layers by the layer mapper 303.
  • the complex modulation symbols on each layer may be mapped by the antenna port mapper 304 for transmission on the antenna port.
  • the resource block mapper 305 may map a complex modulation symbol for each antenna port to an appropriate resource element in a virtual resource block allocated for transmission.
  • the resource block mapper may map the virtual resource block to a physical resource block according to an appropriate mapping scheme.
  • the resource block mapper 305 may allocate a complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex it according to a user.
  • the signal generator 306 modulates a complex modulation symbol for each antenna port, that is, an antenna specific symbol by a specific modulation method, for example, an Orthogonal Frequency Division Multiplexing (OFDM) method, and a complex-valued time domain.
  • An OFDM symbol signal can be generated.
  • the signal generator may perform Inverse Fast Fourier Transform (IFFT) on an antenna specific symbol, and a Cyclic Prefix (CP) may be inserted into a time domain symbol on which IFFT is performed.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • the OFDM symbol is transmitted to a receiving device through each transmit antenna through digital-to-analog conversion and frequency up-conversion.
  • the signal generator may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.
  • signal processing may be performed by a processor of the terminal/base station such as the processor 11 of FIG. 30.
  • a terminal or base station transmission device 10 includes a scrambler 401, a modulator 402, a layer mapper 403, a precoder 404, a resource block mapper 405, and a signal generator 406. It may include.
  • the transmission device 10 may scramble coded bits within the codeword by the scrambler 401 and then transmit them through a physical channel.
  • the scrambled bits are modulated by modulator 402 into complex modulation symbols.
  • the modulator may modulate the scrambled bits according to a predetermined modulation method and arrange them as a complex modulation symbol representing a position on a signal constellation.
  • a predetermined modulation method There are no restrictions on the modulation scheme, and pi/2-BPSK (pi/2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying) or m-QAM (m-Quadrature Amplitude Modulation) It can be used for modulation of the encoded data.
  • the complex modulation symbol may be mapped to one or more transport layers by the layer mapper 403.
  • the complex modulation symbols on each layer may be precoded by the precoder 404 for transmission on the antenna port.
  • the precoder may perform precoding after performing transform precoding on the complex modulation symbol.
  • the precoder may perform precoding without performing transform precoding.
  • the precoder 404 may process the complex modulation symbols in a MIMO scheme according to multiple transmission antennas, output antenna specific symbols, and distribute the antenna specific symbols to a corresponding resource block mapper 405.
  • the output z of the precoder 404 can be obtained by multiplying the output y of the layer mapper 403 by the precoding matrix W of N ⁇ M.
  • N is the number of antenna ports
  • M is the number of layers.
  • the resource block mapper 405 maps a demodulation modulation symbol for each antenna port to an appropriate resource element in a virtual resource block allocated for transmission.
  • the resource block mapper 405 allocates a complex modulation symbol to an appropriate subcarrier and multiplexes it according to a user.
  • the signal generator 406 may generate a complex-valued time domain orthogonal frequency division multiplexing (OFDM) symbol signal by modulating the complex modulation symbol using a specific modulation method, such as an OFDM method.
  • the signal generator 406 may perform Inverse Fast Fourier Transform (IFFT) on an antenna specific symbol, and a Cyclic Prefix (CP) may be inserted into a time domain symbol on which IFFT is performed.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • the OFDM symbol is transmitted to a receiving device through each transmission antenna through digital-to-analog conversion and frequency up-conversion.
  • the signal generator 406 may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.
  • the signal processing process of the reception device 20 may be configured as the reverse of the signal processing process of the transmitter.
  • the processor 21 of the transmission device 10 performs decoding and demodulation on the radio signal received through the antenna port(s) of the transceiver 23 from the outside.
  • the receiving device 20 may include a plurality of multiple receiving antennas, and each signal received through the receiving antenna is restored to a baseband signal and then subjected to multiplexing and MIMO demodulation to be transmitted by the transmitting device 10 originally.
  • the receiving apparatus 20 may include a signal restorer for restoring a received signal into a baseband signal, a multiplexer for combining and multiplexing the received signal, and a channel demodulator for demodulating the multiplexed signal sequence into a corresponding codeword.
  • the signal restorer, multiplexer, and channel demodulator may be configured as one integrated module or each independent module performing their functions. More specifically, the signal restorer includes an analog-to-digital converter (ADC) that converts an analog signal into a digital signal, a CP remover that removes CP from the digital signal, and a fast Fourier transform (FFT) on the signal from which CP is removed.
  • ADC analog-to-digital converter
  • FFT fast Fourier transform
  • An FFT module for outputting a frequency domain symbol by applying the FFT module, and a resource element demapper/equalizer for restoring the frequency domain symbol into an antenna specific symbol may be included.
  • the antenna specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword intended to be transmitted by a transmitting apparatus by a channel demodulator.
  • a wireless communication device for example, a terminal, includes a processor 2310 such as a digital signal processor (DSP) or a microprocessor, a transceiver 2335, a power management module 2305, and an antenna 2340. ), battery 2355, display 2315, keypad 2320, GPS (Global Positioning System) chip 2360, sensor 2365, memory 2330, SIM (Subscriber Identification Module) card 2325, speaker It may include at least one of 2345 and the microphone 2350. There may be a plurality of antennas and processors.
  • DSP digital signal processor
  • the processor 2310 may implement the functions, procedures, and methods described herein.
  • the processor 2310 of FIG. 33 may be the processors 11 and 21 of FIG. 30.
  • the memory 2330 is connected to the processor 2310 and stores information related to the operation of the processor.
  • the memory may be located inside or outside the processor, and may be connected to the processor through various technologies such as wired connection or wireless connection.
  • the memory 2330 of FIG. 33 may be the memories 12 and 22 of FIG. 30.
  • a user may input various types of information such as a phone number using various technologies such as pressing a button on the keypad 2320 or activating a sound using the microphone 2350.
  • the processor 2310 may receive and process the user's information, and perform an appropriate function, such as dialing the input phone number.
  • data may be retrieved from SIM card 2325 or memory 2330 to perform an appropriate function.
  • the processor 2310 may display various types of information and data on the display 2315 for user convenience.
  • the transceiver 2335 is connected to the processor 2310 and transmits and/or receives a radio signal such as a radio frequency (RF) signal.
  • the processor may control the transceiver to initiate communication or transmit wireless signals including various types of information or data such as voice communication data.
  • the transceiver includes a transmitter and a receiver for transmission and reception of radio signals.
  • the antenna 2340 may facilitate transmission and reception of wireless signals.
  • the transceiver upon receiving the radio signal, the transceiver may forward and convert the signal to a baseband frequency for processing by a processor.
  • the processed signal can be processed by various techniques, such as being converted into audible or readable information to be output through the speaker 2345.
  • the transceiver of FIG. 33 may be the transceivers 13 and 23 of FIG. 30.
  • various components such as a camera and a USB (Universal Serial Bus) port may be additionally included in the terminal.
  • the camera may be connected to the processor 2310.
  • the terminal does not necessarily have to include all the elements of FIG. 33. That is, some components, for example, a keypad 2320, a global positioning system (GPS) chip 2360, a sensor 2365, and a SIM card 2325 may not be essential elements, and in this case, they are not included in the terminal. May not.
  • GPS global positioning system
  • the wireless communication system may include a first device 9010 and a second device 9020.
  • the first device 9010 includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) Module, Robot, Augmented Reality (AR) Device, Virtual Reality (VR) Device, Mixed Reality (MR) Device, Hologram Device, Public Safety Device, MTC Device, IoT Device, Medical Device, Pin It may be a tech device (or financial device), a security device, a climate/environment device, a device related to 5G service, or a device related to the fourth industrial revolution field.
  • UAV Unmanned Aerial Vehicle
  • AI Artificial Intelligence
  • Robot Augmented Reality (AR) Device, Virtual Reality (VR) Device, Mixed Reality (MR) Device
  • Hologram Device Augmented Reality
  • MTC Device Virtual Reality
  • IoT Device Medical Device
  • Pin It may be a tech device (or financial device),
  • the second device 9020 includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) Module, Robot, Augmented Reality (AR) Device, Virtual Reality (VR) Device, Mixed Reality (MR) Device, Hologram Device, Public Safety Device, MTC Device, IoT Device, Medical Device, Pin It may be a tech device (or financial device), a security device, a climate/environment device, a device related to 5G service, or a device related to the fourth industrial revolution field.
  • UAV Unmanned Aerial Vehicle
  • AI Artificial Intelligence
  • Robot Augmented Reality (AR) Device, Virtual Reality (VR) Device, Mixed Reality (MR) Device
  • Hologram Device Augmented Reality
  • MTC Device Virtual Reality
  • IoT Device Medical Device
  • Pin It may be a tech device (or financial device),
  • the terminal is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistants (PDA), a portable multimedia player (PMP), a navigation system, a slate PC, and a tablet.
  • PDA personal digital assistants
  • PMP portable multimedia player
  • PC tablet PC
  • ultrabook ultrabook
  • wearable device wearable device, for example, a watch-type terminal (smartwatch), glass-type terminal (smart glass), HMD (head mounted display)
  • the HMD may be a display device worn on the head.
  • HMD can be used to implement VR, AR or MR.
  • a drone may be a vehicle that is not human and is flying by a radio control signal.
  • the VR device may include a device that implements an object or a background of a virtual world.
  • the AR device may include a device that connects and implements an object or background of a virtual world, such as an object or background of the real world.
  • the MR device may include a device that combines and implements an object or background of a virtual world, such as an object or background of the real world.
  • the hologram device may include a device that implements a 360-degree stereoscopic image by recording and reproducing stereoscopic information by utilizing an interference phenomenon of light generated by the encounter of two laser lights called holography.
  • the public safety device may include an image relay device or an image device wearable on a user's human body.
  • the MTC device and the IoT device may be devices that do not require direct human intervention or manipulation.
  • the MTC device and the IoT device may include a smart meter, a bending machine, a thermometer, a smart light bulb, a door lock, or various sensors.
  • the medical device may be a device used for the purpose of diagnosing, treating, alleviating, treating or preventing a disease.
  • the medical device may be a device used for the purpose of diagnosing, treating, alleviating or correcting an injury or disorder.
  • a medical device may be a device used for the purpose of examining, replacing or modifying a structure or function.
  • the medical device may be a device used for the purpose of controlling pregnancy.
  • the medical device may include a device for treatment, a device for surgery, a device for (extra-corporeal) diagnosis, a device for hearing aid or a procedure.
  • the security device may be a device installed to prevent a risk that may occur and maintain safety.
  • the security device may be a camera, CCTV, recorder, or black box.
  • the fintech device may be a device capable of providing financial services such as mobile payment.
  • the fintech device may include a payment device or a point of sales (POS).
  • the climate/environment device may include a device that monitors or predicts the climate/environment.
  • the first device 9010 may include at least one or more processors such as the processor 9011, at least one or more memories such as the memory 9012, and at least one or more transceivers such as the transceiver 9013.
  • the processor 9011 may perform the functions, procedures, and/or methods described above.
  • the processor 9011 may perform one or more protocols.
  • the processor 9011 may perform one or more layers of an air interface protocol.
  • the memory 9012 is connected to the processor 9011 and may store various types of information and/or commands.
  • the transceiver 9013 may be connected to the processor 9011 and controlled to transmit and receive wireless signals.
  • the second device 9020 may include at least one processor such as the processor 9021, at least one memory device such as the memory 9022, and at least one transceiver such as the transceiver 9023.
  • the processor 9021 may perform the functions, procedures, and/or methods described above.
  • the processor 9021 may implement one or more protocols.
  • the processor 9021 may implement one or more layers of an air interface protocol.
  • the memory 9022 is connected to the processor 9021 and may store various types of information and/or commands.
  • the transceiver 9023 is connected to the processor 9021 and may be controlled to transmit and receive radio signals.
  • the memory 9012 and/or the memory 9022 may be connected inside or outside the processor 9011 and/or the processor 9021, respectively, or other processors through various technologies such as wired or wireless connection. It can also be connected to.
  • the first device 9010 and/or the second device 9020 may have one or more antennas.
  • the antenna 9014 and/or the antenna 9024 may be configured to transmit and receive wireless signals.
  • a specific operation described as being performed by a base station in this document may be performed by its upper node in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network comprising a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
  • the base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • an embodiment of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention is one or more 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, etc.
  • 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, etc.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor through various known means.
  • a specific operation described as being performed by a base station in this document may be performed by an upper node in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network comprising a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
  • the base station may be replaced by terms such as a fixed station, Node B, eNode B (eNB), and access point, and the name of the base station is RRH (remote radio head), eNB, transmission point (TP). ), RP (reception point), repeater (relay) can be used as a generic term.
  • the proposed method is not limited only to uplink or downlink communication, and direct communication between terminals, a base station, a vehicle, a relay node, etc. may use the proposed method.
  • examples of the above-described proposed method may also be included as one of the implementation methods of the present invention, it is obvious that they may be regarded as a kind of proposed method.
  • the above-described proposed schemes may be implemented independently, but may be implemented in the form of a combination (or merge) of some of the proposed schemes.
  • Information on whether the proposed methods are applied is notified by the base station to the terminal or the transmitting terminal to the receiving terminal through a predefined signal (eg, a physical layer signal or a higher layer signal).
  • the rule may be defined so that it may be defined as a fixed rule between the base station and the terminal.
  • the method of transmitting and receiving data in the wireless communication system of the present invention has been described mainly in an example applied to a 3GPP LTE/LTE-A system and a 5G system (New RAT system), but it can be applied to various wireless communication systems.

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

Abstract

La présente invention concerne un procédé pour rapporter des CSI dans un système de communication sans fil. Plus particulièrement, le procédé, mis en oeuvre par un terminal, peut comprendre les étapes consistant à : recevoir, en provenance d'une station de base, des informations de commande relatives à la détermination d'une taille de dimension pour un domaine spécifique utilisé pour un rapport CIS ; recevoir, en provenance de la station de base, des informations de configuration relatives au remplissage à appliquer à une ou plusieurs sous-bandes pour le rapport CIS ; comparer la taille de dimension déterminée sur la base des informations de commande et de la taille d'un vecteur DFT utilisé pour une configuration de livre de codes ; déterminer un motif de remplissage et un schéma de remplissage à appliquer à autant de sous-bandes qu'une valeur d'une différence entre la taille du vecteur DFT et la taille de dimension ; et rapporter les CSI à la station de base sur la base du motif de remplissage et du schéma de remplissage.
PCT/KR2020/005865 2019-05-01 2020-05-04 Procédé pour rapporter des informations d'état de canal (csi) dans un système de communication sans fil et appareil associé WO2020222602A1 (fr)

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WO2023002438A1 (fr) * 2021-07-21 2023-01-26 Lenovo (Singapore) Pte. Ltd. Transmission d'un rapport d'informations d'état de canal
WO2023010388A1 (fr) * 2021-08-05 2023-02-09 Zte Corporation Systèmes et procédés de détermination d'unité de traitement de csi

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WO2023010388A1 (fr) * 2021-08-05 2023-02-09 Zte Corporation Systèmes et procédés de détermination d'unité de traitement de csi

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