WO2020013645A1 - Procédé et dispositif d'exécution d'une transmission sans fil dans une bande sans licence - Google Patents

Procédé et dispositif d'exécution d'une transmission sans fil dans une bande sans licence Download PDF

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Publication number
WO2020013645A1
WO2020013645A1 PCT/KR2019/008606 KR2019008606W WO2020013645A1 WO 2020013645 A1 WO2020013645 A1 WO 2020013645A1 KR 2019008606 W KR2019008606 W KR 2019008606W WO 2020013645 A1 WO2020013645 A1 WO 2020013645A1
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Prior art keywords
ssb
transmission
index
transmitted
information
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PCT/KR2019/008606
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English (en)
Korean (ko)
Inventor
김기태
박기현
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주식회사 케이티
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Priority claimed from KR1020190083074A external-priority patent/KR102297101B1/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to CN201980029209.1A priority Critical patent/CN112042217B/zh
Priority to US17/051,351 priority patent/US11516857B2/en
Publication of WO2020013645A1 publication Critical patent/WO2020013645A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present embodiments propose a method and apparatus for performing wireless communication in consideration of the results of List Before Talk (LBT) for an unlicensed band in a next generation wireless access network (hereinafter, referred to as "NR").
  • LBT List Before Talk
  • NR next generation wireless access network
  • NR New Radio
  • enhancement mobile broadband eMBB
  • massive machine type communication MMTC
  • ultra reliable and low latency communications URLLC
  • Each service scenario has different requirements for data rates, latency, reliability, coverage, and so on, through the frequency bands that make up any NR system.
  • As a method for efficiently satisfying the needs of each usage scenario based on different numerology (eg, subcarrier spacing, subframe, transmission time interval, etc.)
  • numerology eg, subcarrier spacing, subframe, transmission time interval, etc.
  • SSB Synchronization Signal Block
  • the present embodiments can provide a method and apparatus for performing wireless communication in an unlicensed band capable of minimizing the transmission / reception complexity of the sync signal block in consideration of the LBT result when transmitting the sync signal block for access to the unlicensed band. have.
  • the embodiments may provide a specific method and apparatus capable of applying the LBT-based beamforming pattern and beam estimation in the unlicensed band.
  • the present embodiment is a method for a terminal to perform wireless communication in an unlicensed band, receiving a configuration information for a synchronization signal block (SSB) burst set in an unlicensed band Receiving the transmission interval information in which the SSB is transmitted in the SSB burst set based on the results of the LBT (Listen Before Talk) for the unlicensed band; and detecting the SSB in the SSB burst set based on the transmission interval information.
  • SSB synchronization signal block
  • embodiments of the present invention provide a method for a base station to perform wireless communication in an unlicensed band, the method comprising: transmitting configuration information on a synchronization signal block (SSB) burst set in an unlicensed band
  • the method may include performing List Before Talk (LBT) for an SSB burst set in an unlicensed band and transmitting transmission interval information in which an SSB is transmitted in an SSB burst set based on an LBT result.
  • LBT List Before Talk
  • the present embodiments in a terminal performing wireless communication in an unlicensed band, receives configuration information for a synchronization signal block (SSB) burst set in an unlicensed band and performs an unlicensed license.
  • a terminal including a receiver for receiving transmission section information in which an SSB is transmitted in an SSB burst set based on an LBT (Listen Before Talk) result for a band and a controller for detecting the SSB in an SSB burst set based on the transmission interval information Can be.
  • LBT Listen Before Talk
  • the present embodiments in a base station that performs wireless communication in an unlicensed band, includes a List Before Talk (LBT) for a Synchronization Signal Block (SSB) burst set in an unlicensed band.
  • LBT List Before Talk
  • SSB Synchronization Signal Block
  • a base station including a control unit to perform and transmits the configuration information for the SSB burst set in the unlicensed band, and the transmission section for transmitting the transmission interval information is transmitted in the SSB burst set based on the LBT results.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of the LBT result can do.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR wireless communication system to which an embodiment of the present invention may be applied.
  • FIG. 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • FIG. 5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • FIG. 6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
  • FIG. 8 is a diagram illustrating an example of symbol level alignment in different SCSs to which the present embodiment can be applied.
  • FIG. 9 is a diagram for explaining an NR time domain structure according to subcarrier spacing to which an embodiment may be applied.
  • FIG. 10 is a diagram for explaining an NR PSS / SS / PBCH block to which the present embodiment can be applied.
  • FIG. 11 is a diagram for explaining an SSB burst periodicity to which the present embodiment can be applied.
  • FIG. 12 is a diagram illustrating a procedure of performing wireless communication in an unlicensed band by a terminal according to an embodiment.
  • FIG. 13 is a diagram illustrating a procedure of performing wireless communication in an unlicensed band by a base station according to an embodiment.
  • FIG. 14 is a diagram for describing setting of an SSB transmission position in an SSB burst, according to an exemplary embodiment.
  • FIG. 15 is a diagram for describing setting of an SSB indication field in an SSB burst according to an embodiment.
  • FIG. 16 illustrates switching of an LBT-based SSB indication pattern according to an embodiment.
  • 17 to 19 are diagrams for describing setting of additional detection range information for an SSB according to an embodiment.
  • 20 illustrates SSB continuous transmission in an unlicensed band according to an embodiment.
  • 21 is a diagram for describing shift-based SSB transmission in an unlicensed band according to an embodiment.
  • 22 is a diagram for describing continuous CSI-RS transmission after LBT in an unlicensed band according to an embodiment.
  • FIG. 23 is a diagram illustrating SSB transmission and beam setup according to LBT in an unlicensed band according to an embodiment.
  • 24 is a diagram for describing a cyclic pattern based beam setting of an unlicensed band according to an embodiment.
  • FIG. 25 illustrates an application of a reference point to SSB / CSI-RS based L1-RSRP derivation according to an embodiment.
  • FIG. 26 illustrates a non-application of a reference point for SSB / CSI-RS based L1-RSRP derivation according to an embodiment.
  • FIG. 27 is a diagram illustrating an application of an SSB change monitoring signal according to an embodiment.
  • FIG. 28 is a diagram illustrating a configuration of a user equipment (UE) according to another embodiment.
  • 29 is a diagram illustrating a configuration of a base station according to another embodiment.
  • first, second, A, B, (a), and (b) may be used. These terms are only to distinguish the components from other components, and the terms are not limited in nature, order, order, or number of the components.
  • temporal and posterior relations are described as “after”, “following”, “after”, “before”, and the like. Or where flow-benefit relationships are described, they may also include cases where they are not continuous unless “right” or "direct” is used.
  • the numerical value or the corresponding information may be various factors (e.g., process factors, internal or external shocks, It may be interpreted as including an error range that may be caused by noise).
  • the wireless communication system herein refers to a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station or a core network.
  • embodiments disclosed below can be applied to a wireless communication system using various radio access technologies.
  • embodiments of the present invention may include code division multiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA).
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA timedivision multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • the wireless access technology may mean not only a specific access technology, but also a communication technology for each generation established by various communication consultation organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU.
  • CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), employing OFDMA in downlink and SC- in uplink FDMA is adopted.
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • E-UMTS evolved-UMTS terrestrial radio access
  • OFDMA OFDMA in downlink
  • SC- in uplink FDMA is adopted.
  • the embodiments may be applied to a wireless access technology that is currently disclosed or commercialized, and may be applied to a wireless access technology that is currently under development or will be developed in the future.
  • the terminal in the present specification is a comprehensive concept that means a device including a wireless communication module for communicating with a base station in a wireless communication system, WCDMA, LTE, NR, HSPA and IMT-2020 (5G or New Radio)
  • UE user equipment
  • MS Mobile Station
  • UT User Interface
  • SS Subscriber Station
  • the terminal may be a user portable device such as a smart phone according to a usage form, and may mean a vehicle, a device including a wireless communication module in a vehicle, and the like in a V2X communication system.
  • a machine type communication system it may mean an MTC terminal, an M2M terminal, a URLLC terminal, etc. equipped with a communication module to perform machine type communication.
  • a base station or a cell of the present specification refers to an end point that communicates with a terminal in terms of a network, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, a Low Power Node, and an LPN. Sector, site, various types of antenna, base transceiver system (BTS), access point, access point (for example, transmission point, reception point, transmission point and reception point), relay node ), A mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell.
  • the cell may mean a bandwidth part (BWP) in the frequency domain.
  • the serving cell may mean an activation BWP of the terminal.
  • the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the wireless area, or 2) the wireless area itself. In 1) all devices that provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from a viewpoint of a user terminal or a neighboring base station.
  • a cell refers to a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • Uplink Uplink, UL, or uplink
  • Downlink Downlink (Downlink, DL, or downlink) means a method for transmitting and receiving data to the terminal by the base station do.
  • Downlink may mean a communication or communication path from the multiple transmission and reception points to the terminal
  • uplink uplink
  • uplink may mean a communication or communication path from the terminal to the multiple transmission and reception points.
  • the transmitter in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal.
  • uplink a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • Uplink and downlink transmit and receive control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like. Configure the same data channel to send and receive data.
  • a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • 3GPP After researching 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of ITU-R's next generation wireless access technology. Specifically, 3GPP develops a new NR communication technology separate from LTE-A pro and 4G communication technology, which is an enhancement of LTE-Advanced technology to the requirements of ITU-R with 5G communication technology. Both LTE-A pro and NR mean 5G communication technology.
  • 5G communication technology will be described based on NR when a specific communication technology is not specified.
  • Operational scenarios in NR defined various operational scenarios by adding considerations to satellites, automobiles, and new verticals in the existing 4G LTE scenarios.In terms of services, they have eMBB (Enhanced Mobile Broadband) scenarios and high terminal density. Supports a range of mass machine communication (MMTC) scenarios that require low data rates and asynchronous connections, and Ultra Reliability and Low Latency (URLLC) scenarios that require high responsiveness and reliability and support high-speed mobility. .
  • MMTC mass machine communication
  • URLLC Ultra Reliability and Low Latency
  • NR discloses a wireless communication system using a new waveform and frame structure technology, low latency technology, mmWave support technology, and forward compatible technology.
  • the NR system proposes various technological changes in terms of flexibility in order to provide forward compatibility. The main technical features of the NR will be described with reference to the drawings below.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR system to which the present embodiment may be applied.
  • an NR system is divided into a 5G core network (5GC) and an NR-RAN part, and the NG-RAN controls a user plane (SDAP / PDCP / RLC / MAC / PHY) and a user equipment (UE).
  • SDAP user plane
  • PDCP user plane
  • RLC user equipment
  • UE user equipment
  • gNB gNB and ng-eNBs that provide planar (RRC) protocol termination.
  • the gNB interconnects or gNBs and ng-eNBs are interconnected via an Xn interface.
  • gNB and ng-eNB are each connected to 5GC through the NG interface.
  • the 5GC may be configured to include an access and mobility management function (AMF) that is in charge of a control plane such as a terminal access and mobility control function, and a user plane function (UPF), which is in charge of a control function in user data.
  • AMF access and mobility management function
  • UPF user plane function
  • NR includes support for sub-6 GHz frequency bands (FR1, Frequency Range 1) and 6 GHz and higher frequency bands (FR2, Frequency Range 2).
  • gNB means a base station providing the NR user plane and control plane protocol termination to the terminal
  • ng-eNB means a base station providing the E-UTRA user plane and control plane protocol termination to the terminal.
  • the base station described in the present specification should be understood to mean gNB and ng-eNB, and may be used to mean gNB or ng-eNB separately.
  • a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and a CP-OFDM or DFT-s-OFDM is used for uplink transmission.
  • OFDM technology is easy to combine with Multiple Input Multiple Output (MIMO), and has the advantage of using a low complexity receiver with high frequency efficiency.
  • MIMO Multiple Input Multiple Output
  • the NR transmission neuron is determined based on sub-carrier spacing and cyclic prefix (CP), and ⁇ is used as an exponent value of 2 based on 15 kHz as shown in Table 1 below. Is changed to.
  • CP sub-carrier spacing and cyclic prefix
  • the NR's neuronality may be classified into five types according to the subcarrier spacing. This is different from the subcarrier spacing of LTE, one of 4G communication technologies, fixed at 15 kHz. Specifically, the subcarrier intervals used for data transmission in NR are 15, 30, 60, and 120 kHz, and the subcarrier intervals used for synchronization signal transmission are 15, 30, 12, and 240 kHz. In addition, the extended CP applies only to 60 kHz subcarrier intervals.
  • the frame structure (frame) in NR is a frame having a length of 10ms consisting of 10 subframes having the same length of 1ms (frame) is defined.
  • One frame may be divided into half frames of 5 ms, and each half frame includes five subframes.
  • one subframe consists of one slot
  • each slot consists of 14 OFDM symbols.
  • 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • the slot is fixedly configured with 14 OFDM symbols in the case of a normal CP, but the length of the slot may vary depending on the subcarrier spacing.
  • the slot has a length of 1 ms and the same length as the subframe.
  • the slot is composed of 14 OFDM symbols.
  • two slots may be included in one subframe with a length of 0.5 ms. That is, subframes and frames are defined with a fixed time length, and slots are defined by the number of symbols, and thus the time length may vary according to the subcarrier spacing.
  • NR defines a basic unit of scheduling as a slot, and also introduces a mini slot (or subslot or non-slot based schedule) to reduce transmission delay of a radio section.
  • the use of a wide subcarrier spacing shortens the length of one slot in inverse proportion, thereby reducing the transmission delay in the radio section.
  • the mini slot (or sub slot) is for efficient support for the URLLC scenario and can be scheduled in units of 2, 4, and 7 symbols.
  • NR defines uplink and downlink resource allocation at a symbol level in one slot.
  • a slot structure capable of transmitting HARQ ACK / NACK directly within a transmission slot has been defined, and this slot structure will be described as a self-contained structure.
  • NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in 3GPP Rel-15.
  • a combination of various slots supports a common frame structure constituting an FDD or TDD frame.
  • a slot structure in which all symbols of a slot are set to downlink a slot structure in which all symbols are set to uplink
  • a slot structure in which downlink symbol and uplink symbol are combined are supported.
  • NR also supports that data transmission is distributed and scheduled in one or more slots. Accordingly, the base station can inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot by using a slot format indicator (SFI).
  • SFI slot format indicator
  • the base station may indicate a slot format by indicating an index of a table configured through UE-specific RRC signaling using SFI, and may indicate the slot format dynamically through DCI (Downlink Control Information) or statically through RRC. You can also specify quasi-statically.
  • DCI Downlink Control Information
  • antenna ports With regard to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, bandwidth parts, etc. are considered do.
  • the antenna port is defined such that the channel on which the symbol is carried on the antenna port can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the broad characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.
  • the Resource Grid since the Resource Grid supports a plurality of numerologies in the same carrier, a resource grid may exist according to each numerology.
  • the resource grid may exist according to the antenna port, subcarrier spacing, and transmission direction.
  • the resource block is composed of 12 subcarriers and is defined only in the frequency domain.
  • a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as shown in FIG. 3, one resource block may vary in size depending on the subcarrier spacing.
  • the NR defines "Point A" serving as a common reference point for the resource block grid, a common resource block, a virtual resource block, and the like.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • a bandwidth part may be designated within a carrier bandwidth and used by a UE.
  • the bandwidth part is associated with one neuralology and consists of a subset of consecutive common resource blocks, and can be dynamically activated over time.
  • the UE is configured with up to four bandwidth parts, respectively, uplink and downlink, and data is transmitted and received using the bandwidth part activated at a given time.
  • uplink and downlink bandwidth parts are set independently, and in the case of unpaired spectrum, to prevent unnecessary frequency re-tunning between downlink and uplink operation.
  • the bandwidth parts of the downlink and the uplink are configured in pairs so as to share the center frequency.
  • the UE performs a cell search and random access procedure to access and communicate with a base station.
  • Cell search is a procedure in which a terminal synchronizes with a cell of a corresponding base station, obtains a physical layer cell ID, and acquires system information by using a synchronization signal block (SSB) transmitted by a base station.
  • SSB synchronization signal block
  • FIG. 5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • an SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), which occupy one symbol and 127 subcarriers, respectively, three OFDM symbols, and a PBCH spanning 240 subcarriers.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the terminal monitors the SSB in the time and frequency domain to receive the SSB.
  • SSB can be transmitted up to 64 times in 5ms.
  • a plurality of SSBs are transmitted in different transmission beams within 5ms, and the UE performs detection assuming that SSBs are transmitted every 20ms based on a specific beam used for transmission.
  • the number of beams available for SSB transmission within 5 ms time may increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted at 3 GHz or less, and up to 8 different SSBs can be transmitted at a frequency band of 3 to 6 GHz and up to 64 different beams at a frequency band of 6 GHz or more.
  • Two SSBs are included in one slot, and the start symbol and the number of repetitions in the slot are determined according to the subcarrier spacing.
  • SSB is not transmitted at the center frequency of the carrier bandwidth, unlike the SS of the conventional LTE. That is, the SSB may be transmitted even where the center of the system band is not, and when supporting broadband operation, a plurality of SSBs may be transmitted in the frequency domain. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency position for monitoring the SSB.
  • the carrier raster and the synchronization raster which are the center frequency position information of the channel for initial access, are newly defined in the NR, and the synchronization raster has a wider frequency interval than the carrier raster, and thus supports fast SSB search of the terminal. Can be.
  • the UE may acquire the MIB through the PBCH of the SSB.
  • the Master Information Block includes minimum information for the UE to receive the remaining system information (RMSI) that the network broadcasts.
  • the PBCH is information about the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (for example, SIB1 neuronological information, information related to SIB1 CORESET, search space information, PDCCH Related parameter information, etc.), offset information between the common resource block and the SSB (the position of the absolute SSB in the carrier is transmitted through SIB1), and the like.
  • the SIB1 neuronological information is equally applied to some messages used in a random access procedure for accessing a base station after the terminal completes a cell search procedure.
  • the neuralology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.
  • the aforementioned RMSI may refer to System Information Block 1 (SIB1), which is broadcast periodically (ex, 160ms) in a cell.
  • SIB1 includes information necessary for the UE to perform an initial random access procedure and is periodically transmitted through the PDSCH.
  • the UE needs to receive the information of the neuterology used for the SIB1 transmission and the control resource set (CORESET) information used for scheduling the SIB1 through the PBCH.
  • the UE checks scheduling information on SIB1 using SI-RNTI in CORESET and acquires SIB1 on PDSCH according to the scheduling information.
  • the remaining SIBs other than SIB1 may be transmitted periodically or may be transmitted at the request of the terminal.
  • FIG. 6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
  • the terminal transmits a random access preamble for random access to the base station.
  • the random access preamble is transmitted on the PRACH.
  • the random access preamble is transmitted to the base station through a PRACH composed of consecutive radio resources in a specific slot that is periodically repeated.
  • BFR beam failure recovery
  • the terminal receives a random access response to the transmitted random access preamble.
  • the random access response may include a random access preamble identifier (ID), a UL grant (uplink radio resource), a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier), and a time alignment command (TAC). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to indicate to which UE the included UL Grant, temporary C-RNTI, and TAC are valid.
  • the random access preamble identifier may be an identifier for the random access preamble received by the base station.
  • the TAC may be included as information for the UE to adjust uplink synchronization.
  • the random access response may be indicated by a random access identifier on the PDCCH, that is, a Random Access-Radio Network Temporary Identifier (RA-RNTI).
  • RA-RNTI Random Access-Radio Network Temporary Identifier
  • the terminal receiving the valid random access response processes the information included in the random access response and performs the scheduled transmission to the base station. For example, the terminal applies a TAC and stores a temporary C-RNTI. In addition, by using the UL Grant, data or newly generated data stored in the buffer of the terminal is transmitted to the base station. In this case, information that can identify the terminal should be included.
  • the terminal receives a downlink message for contention resolution.
  • the downlink control channel in NR is transmitted in a control resource set (CORESET) having a length of 1 to 3 symbols, and transmits up / down scheduling information, slot format index (SFI), and transmit power control (TPC) information.
  • CORESET control resource set
  • SFI slot format index
  • TPC transmit power control
  • CORESET Control Resource Set
  • the terminal may decode the control channel candidate using one or more search spaces in the CORESET time-frequency resource.
  • the QCL (Quasi CoLocation) assumption for each CORESET has been set, which is used to inform the analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay, which are assumed by conventional QCL.
  • CORESET may exist in various forms within a carrier bandwidth in one slot, and CORESET in the time domain may be configured with up to three OFDM symbols.
  • CORESET is defined as a multiple of six resource blocks up to the carrier bandwidth in the frequency domain.
  • the first CORESET is indicated through the MIB as part of the initial bandwidth part configuration to receive additional configuration information and system information from the network.
  • the terminal may receive and configure one or more CORESET information through RRC signaling.
  • frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals or various messages related to NR (New Radio) May be interpreted as meaning used in the past or present, or various meanings used in the future.
  • 3GPP supports a multiple subcarrier based frame structure with respect to the frame structure of NR.
  • the default SubCarrier Spacing (SCS) is 15 kHz, which supports a total of five SCSs, which are multiplied by 2 ⁇ by 15 kHz.
  • SCS values according to ⁇ values are shown in Table 1 above.
  • the length of a slot may vary according to numerology. That is, it can be seen that the shorter the length of the slot, the larger the SCS.
  • the slot defined in the NR is defined based on 14 OFDM symbols.
  • NR supports the following time domain structure on the time axis: Unlike conventional LTE, in NR, the basic scheduling unit is changed into a slot. In addition, referring to FIG. 9, in NR, a slot is composed of 14 OFDM symbols regardless of subcarrier spacing. In addition, the NR also supports a non-slot structure consisting of 2, 4, 7 OFDM symbols, which are smaller scheduling units. The non-slot structure may be utilized as a scheduling unit for the URLLC service.
  • the radio frame is set to 10 ms regardless of the neural roller.
  • the subframe is set to 1 ms as a reference for the time duration.
  • subframes are not used in data / control scheduling units.
  • a slot is mainly used in eMBB and includes 14 OFDM symbols.
  • Non-slots, such as mini-slots, are mainly used in URLLC, but are not limited to URLLC, and include two, four, or seven OFDM symbols.
  • TTI duration is the time duration for data / control channel transmission, which is set to a number of OFDM symbols per slot / nonslot.
  • NR-based access to Unlicensed spectrum NR-U
  • any operator or individual may use the wireless communication service within the regulation of each country, not a wireless channel exclusively used by any operator. Accordingly, when providing NR service through unlicensed band, co-existence problem with various short-range wireless communication protocols such as WiFi, Bluetooth, and NFC already provided through the corresponding unlicensed band, and also between each NR operator or LTE provider There is a need for a solution to co-existence problems.
  • the power level of the radio channel or carrier to be used is sensed by transmitting the radio signal before transmitting the radio signal in order to avoid interference or collision between the respective radio communication services.
  • LBT List Before Talk
  • the radio communication service in the unlicensed band is not licensed band because there is a possibility that it will be restricted in providing NR service through the band.
  • the QoS required by the user cannot be guaranteed.
  • NR-U unlike the existing LTE, which supported unlicensed spectrum through carrier aggregation (CA) with licensed spectrum
  • deployment scenario of unlicensed band NR As a deployment scenario, an unlicensed band is considered because a stand-alone NR-U cell, a licensed band NR cell, or a dual connectivity (DC) based NR-U cell with an LTE cell is considered. It is necessary to design a data transmission / reception method to satisfy the minimum QoS in itself.
  • CA carrier aggregation
  • the NR Synchronization Signal Block may be transmitted in various subcarrier spacings and is always transmitted together with the PBCH.
  • the minimum required transmission band is defined for each subcarrier spacing as follows.
  • GHz is defined as 15 kHz SCS and 5 MHz excluding some specific bands such as bands n41, n77 and n78 with 30 kHz SCS and 10 MHz. Above 6 GHz, it is defined as 120 kHz SCS and 10 MHz.
  • the subcarrier spacing supported for each frequency band is different. Below 1 GHz, SCSs of 15 kHz, 30 kHz, and 60 kHz are supported. For bands between 1 GHz and 6 GHz, SCSs of 15 kHz, 30 kHz, and 60 kHz are supported. Below 24 GHz and below 52.6 GHz, SCS at 60 kHz and 120 kHz is supported. Also, 240 kHz does not apply to data.
  • the SSB is defined and transmitted as an SSB burst set rather than a single form. Basically, the SSB burst set becomes 5ms regardless of the neuralology.
  • the maximum number L of SSB blocks that can be transmitted in the set is as follows.
  • L is set to 4 for a frequency range up to 3 GHz.
  • L is set to 8 for the frequency range from 3 GHz to 6 GHz.
  • L is set to 64 for the frequency range from 6 GHz to 52.6 GHz.
  • the period in which the defined SSB burst set is transmitted is additionally set to RRC and is indicated to the terminal.
  • a terminal performing an initial access assumes a 20 ms period as a default and performs system information update after synchronization is acquired. Thereafter, the SSB burst period value is last updated by the base station.
  • a layer 1 reference signal receiver power (L1-RSRP) or a beam resource indicator is used for beam estimation.
  • the beam resource indicator means a CRI-RS resource indicator or an SSB index.
  • Beam estimation over SSB estimates L1-RSRP over SSB resources configured for higher layer signaling.
  • the CSI-RS also performs a linear average of one port or two ports of the configured CSI-RS resources for L1-RSRP estimation.
  • the L1-RSRP value estimated by the terminal through the SSB and CSI-RS resources is reported to the gNB through the selected SSB index or CRI.
  • Period and reporting value setting for beam reporting is as follows.
  • L1-RSRP and / or beam resource indicators e.g. CRI or SSB index
  • ReportPeriodicity ⁇ 5, 10, 20, 40, 80, 160, 320 ⁇ .
  • ReportPeriodicity ⁇ 5, 10, 20, 40, 80, 160, 320 ⁇ .
  • the reporting configurations are configured as follows when the UE sets the upper layer parameter ReportQuantity to 'CRI / RSRP'.
  • nrofReportedRS higher layer configured
  • SSBRI SSB Resource Indicator
  • the terminal should use the largest L1-RSRP and differential L1-RSRP based reporting, and the maximum value of L1-RSRP uses a 7-bit value and the differential L1-RSRP uses 4-bit values.
  • Differential L1-RSRP values are calculated with a 2 dB step size referring to the maximum L1-RSRP value that is part of the same L1-RSRP reporting instance.
  • the UE may report up to number-of-beams-reporting L1-RSRP and CSI reporting in a single reporting instance and receive one spatial domain.
  • the number-of-beams-reporting [CSI-RS and or SSB] resources may be simultaneously received by the terminal using a filter or a plurality of simultaneous spatial domain reception filters.
  • the UE may be configured with CSI-RS resources, SS / PBCH block resources or CSI-RS and SS / PBCH block resources.
  • the terminal may be configured with CSI-RS resources for setting up to 16 CSI-RS resource sets having a maximum of 64 resources in each set. The total number of different CSI-RS resources in all resource sets does not exceed 128.
  • NR-U a stand-alone design for the unlicensed band is considered. Therefore, even if the gNB transmits the synchronization signal, the synchronization signal may not be transmitted at a desired time since the LBT needs to be performed. In addition, if a synchronization signal is transmitted in all synchronization signal candidates (candidate), there may be a need for a suitable solution for the frequency efficiency degradation and SSB detection complexity of the terminal increases. In addition, for beam estimation, SSB or CSI-RS resources transmitted at a predetermined location are required. However, in the NR-U, whether or not the measurement RS transmission is determined according to the LBT result, the expected beam estimation cannot always be performed.
  • FIG. 12 is a diagram illustrating a procedure of performing wireless communication in an unlicensed band by a terminal according to an embodiment.
  • the terminal may receive configuration information on a synchronization signal block (SSB) burst set in an unlicensed band (S1200).
  • SSB synchronization signal block
  • the SSB is defined and transmitted as an SSB burst set rather than a single form.
  • the terminal may receive configuration information on an SSB burst set for receiving the SSB from the base station.
  • the configuration information may include information on period or duration of the SSB burst set.
  • the number of SSBs in the SSB burst set is 8 at 15 kHz SCS. Since a total of two SSBs may be transmitted in one slot, the SSB transmission position may be set in four slots within the SSB burst.
  • the terminal may receive transmission interval information in which the SSB is transmitted in the SSB burst set based on the result of List Before Talk (LBT) for the unlicensed band (S1210).
  • LBT List Before Talk
  • an LBT process In order to transmit a radio signal from any node in the unlicensed band, an LBT process must be performed to check whether the corresponding radio channel is occupied by another node. Accordingly, for SSB transmission in the NR-U cell of the unlicensed band configured by any NR base station, LBT for the corresponding unlicensed band should be performed. As a result of performing the LBT, when the radio channel of the unlicensed band is empty, the base station may transmit the SSB through the radio channel of the unlicensed band.
  • the SSB always transmitted at a predetermined time point may not be transmitted in the slot set for the unlicensed band. Accordingly, when the LBT fails, transmission interval information for indicating the SSB index in which the SSB is transmitted in the SSB burst set may be set.
  • transmission interval information in which the SSB is transmitted in the SSB burst set including information on the change of the SSB transmission position according to the LBT failure may be transmitted to the terminal.
  • the transmission interval information may include SSB index information in which the SSB is actually transmitted because LBT succeeds in the SSB burst set.
  • the arrangement of the SSB index to which the SSB is actually transmitted may be flexibly set in a plurality of patterns, and the selected pattern may be applied according to a predetermined criterion.
  • the SSB index to which the SSB is actually transmitted may be indicated through RRC signaling or RMSI.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include transmitting an SSB not transmitted in the SSB index in which the LBT fails in the SSB burst set after the SSB transmitted in the SSB index in which the LBT succeeds. It may include click pattern (cyclic pattern) information. For example, it is assumed that the SSB transmission position that is set most recently through higher layer signaling is SSB index # 0 to # 3. If the LBT is successful in SSB index # 2, the continuous transmission of the SSB may be performed in SSB index # 2 ⁇ # 5.
  • the gNB may always transmit the SSB at a predetermined time point. Accordingly, different beamforming may be applied to each SSB in the SSB burst set, and such beam application may be set to be repeated in the SSB burst set of the next period.
  • the beam transmission setting for the case where the transmission time of the SSB is not always transmitted at the same location may be considered.
  • beam mapping may be performed on all SSB indexes in the form of a cyclic pattern with respect to the beam pattern initially set for the SSBs in the SSB burst.
  • Cyclic pattern form can be predefined, the pattern can be determined in consideration of the actual SSB density transmitted in the SSB burst. For example, a beam pattern set for SSB index # 0 and # 1 may be applied to SSB index # 4 and # 5.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include shift value information indicating an SSB index for additionally transmitting the SSB in the SSB burst set.
  • the terminal may additionally detect the SSB index provided by the shift pattern in addition to the SSB detection range based on the existing SSB indication information.
  • the terminal may detect the SSB in the SSB burst set based on the transmission interval information (S1220).
  • Transmission interval information including the SSB index in which the SSB is transmitted in the SSB burst set may be indicated through RRC signaling or RMSI.
  • the terminal may detect the SSB in the slot corresponding to the SSB index in which the SSB is transmitted in the SSB burst set based on the transmission interval information. That is, the terminal may detect the SSB at a position other than the initially set position according to the result of the LBT.
  • the terminal may acquire synchronization and update system information based on the detected SSB.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of an LBT result can be provided.
  • FIG. 13 is a diagram illustrating a procedure of performing wireless communication in an unlicensed band by a base station according to an embodiment.
  • the base station may transmit configuration information on a synchronization signal block (SSB) burst set in an unlicensed band (S1300).
  • SSB synchronization signal block
  • the SSB is defined and transmitted as an SSB burst set rather than a single type.
  • the base station may transmit configuration information on the SSB burst set for transmitting the SSB to perform the initial access in the unlicensed band of the terminal.
  • the configuration information may include information on period or duration of the SSB burst set.
  • the base station may perform List Before Talk (LBT) for the SSB burst set in the unlicensed band (S1310).
  • LBT List Before Talk
  • an LBT process In order to transmit a radio signal from any node in the unlicensed band, an LBT process must be performed to check whether the corresponding radio channel is occupied by another node. Accordingly, for SSB transmission in the NR-U cell of the unlicensed band configured by any NR base station, LBT for the corresponding unlicensed band should be performed. As a result of performing the LBT, when the radio channel of the unlicensed band is empty, the base station may transmit the SSB through the radio channel of the unlicensed band.
  • the base station may transmit transmission interval information in which the SSB is transmitted in the SSB burst set based on the LBT result (S1320).
  • transmission interval information in which the SSB is transmitted in the SSB burst set including information on the change of the SSB transmission position according to the LBT failure may be transmitted to the terminal.
  • the transmission interval information may include SSB index information in which the SSB is actually transmitted because LBT succeeds in the SSB burst set.
  • the arrangement of the SSB index to which the SSB is actually transmitted may be flexibly set in a plurality of patterns, and the selected pattern may be applied according to a predetermined criterion.
  • the SSB index to which the SSB is actually transmitted may be indicated through RRC signaling or RMSI.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include transmitting an SSB not transmitted in the SSB index in which the LBT fails in the SSB burst set after the SSB transmitted in the SSB index in which the LBT succeeds. It may include click pattern (cyclic pattern) information. For example, it is assumed that the SSB transmission position that is set most recently through higher layer signaling is SSB index # 0 to # 3. If the LBT is successful in SSB index # 2, the continuous transmission of the SSB may be performed in SSB index # 2 ⁇ # 5.
  • the gNB may always transmit the SSB at a predetermined time point. Accordingly, different beamforming may be applied to each SSB in the SSB burst set, and such beam application may be set to be repeated in the SSB burst set of the next period.
  • the beam transmission setting for the case where the transmission time of the SSB is not always transmitted at the same location may be considered.
  • beam mapping may be performed on all SSB indexes in the form of a cyclic pattern with respect to the beam pattern initially set for the SSBs in the SSB burst.
  • Cyclic pattern form can be predefined, the pattern can be determined in consideration of the actual SSB density transmitted in the SSB burst. For example, a beam pattern set for SSB index # 0 and # 1 may be applied to SSB index # 4 and # 5.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include shift value information indicating an SSB index for additionally transmitting the SSB in the SSB burst set.
  • the terminal may additionally detect the SSB index provided by the shift pattern in addition to the SSB detection range based on the existing SSB indication information.
  • Transmission interval information including the SSB index in which the SSB is transmitted in the SSB burst set may be indicated through RRC signaling or RMSI.
  • the terminal may detect the SSB in the slot corresponding to the SSB index in which the SSB is transmitted in the SSB burst set based on the transmission interval information. That is, the terminal may detect the SSB at a position other than the initially set position according to the result of the LBT.
  • the terminal may acquire synchronization and update system information based on the detected SSB.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of an LBT result can be provided.
  • the NR-U should have a signal that includes at least SS / PBCH block burst set transmission.
  • NR-U performs listen before talk (LBT) to provide coexistence with WiFi devices.
  • LBT listen before talk
  • in order to transmit a radio signal from any node in the unlicensed band it must go through an LBT process to check whether the radio channel is occupied by another node.
  • LBT for the corresponding unlicensed band should be performed.
  • the base station may transmit the SSB through the radio channel of the unlicensed band.
  • the SSB always transmitted at a predetermined time point may not be transmitted in a desired slot in the stand-alone mode of the NR-U.
  • the UE performs the basic initial access mode by receiving the SSB and the RMSI during the initial access, but may not be able to access the cell even when the synchronization signal is not detected.
  • the following embodiments are proposed in this regard.
  • the SSB may be transmitted by setting multiple SSB transmission pattern information, and the corresponding information may be indicated to the terminal.
  • an SSB index for actual transmission in an SSB burst set may be indicated for SSB transmission.
  • the indication of the SSB index may be transmitted in a bitmap. As a signaling mode for this, it may be indicated through the RMSI in the idle mode and in the connected mode through the RRC.
  • the number of SSBs L in the SSB burst set is 8 at 15 kHz SCS.
  • the entire SSB transmission position can be set in four slots.
  • the location where the actual SSB is transmitted may be indicated by the gNB to the terminal through the signaling to the corresponding information.
  • a plurality of SSB indication fields for NR-U may be defined and corresponding information may be indicated to the terminal.
  • a plurality of SSB transmission patterns in the SSB burst set may be indicated to the UE.
  • the NR-U performs LBT for SSB transmission. Therefore, according to an example, when the gNB fails the LBT in the SSB indication pattern-1, the gNB may perform the LBT again based on the SSB indication pattern-2. That is, in the example of FIG. 15, when the LBT attempted only at SSB_index # 0 and # 4 fails, the LBT may be performed at SSB_index # 2 and # 6.
  • the gNB since the gNB has already set the multiple SSB indication pattern to the UE, when performing failure of performing LBT based on the SSB indication pattern-1, the gNB switches to the SSB indication pattern-2 to switch to the LBT. Can be done immediately. If the LBT is successful, the SSB transmission may be continuously performed in the SSB indication pattern-2 instead of the original SSB indication pattern-1. The same applies to the reverse of switching to SSB indication pattern-1 due to the failure of LBT based on SSB indication pattern-2.
  • the UE may selectively operate a pattern for successful SSB detection based on a multiple SSB indication pattern.
  • the UE can acquire multiple SSB indication patterns based on system information.
  • the gNB may switch the SSB indication pattern according to the LBT result. Accordingly, the terminal may perform SSB detection as follows.
  • the UE may perform SSB detection for all SSB transmission intervals in the SSB burst set. Therefore, the complexity of initial SSB detection is the highest. Thereafter, the terminal may detect the SSB for the multiple SSB indication pattern according to the SSB indication information. In addition, the UE may perform SSB detection assuming an SSB pattern including an initial SSB index normally detected by the SSB. In addition, when the SSB is not detected at the existing SSB indication pattern position, the UE may perform SSB detection on other patterns and change the SSB indication pattern including the newly detected SSB index. Also, basically, the SSB indexes included in each of the SSB indication patterns may be set not to overlap each other. However, this is only an example, and the present disclosure is not limited thereto, and the SSB index may overlap in some intervals.
  • the UE performs SSB detection on other patterns, and the SSB indication pattern including the newly detected SSB index is included. You can change it.
  • the gNB may change the Multiple SSB indication pattern through signaling.
  • the RRC information may be set for the SSB indication pattern and transmitted to the terminal.
  • gNB can set up several SSB indication patterns. However, it may not operate in a corresponding mode using multiple SSB indication patterns from the beginning. For example, initially, the same SSB indication information may be used as the existing NR. Thereafter, if the number of failures of the LBT increases, so that many opportunities cannot be obtained in the SSB transmission, it may operate in the corresponding mode. Accordingly, in this case, the multi-SSB indication pattern configuration information as shown in Figure 15 can be indicated to the terminal. Accordingly, the method of defining multiple SSB indication pattern information can be classified as follows.
  • the bitmap size that the gNB should transmit to the terminal is increased in proportion to the number of the multiple patterns.
  • the total number of information required for N pattern designation for SSB burst set L 8 becomes L ⁇ N.
  • the pattern information may be configured, such as Pattern-1: [10001000], Pattern-2: [01000100], Pattern-3: [00100010], and the like.
  • the gNB may set additional detection range information to the UE in addition to the SSB indication pattern.
  • the gNB may provide an opportunity to perform LBT so that SSB transmission may be performed as soon as possible even if LBT fails through multiple SSB indication pattern settings.
  • a method of transmitting information on multiple patterns to the terminal has been described above.
  • a single SSB indication information / pattern may be provided in the same manner as the existing NR.
  • the 'N_add' value set at this time may be defined as + direction, ⁇ direction, ⁇ direction, and the like.
  • the initial terminal detection attempt SSB index becomes [0,4] in relation to the SSB index range to be detected by the terminal.
  • SSB detection may be performed at the SSB index of [0, 1, 2, 4, 5, 6]. That is, SSB_indexes including the existing SSB index may be newly included in the +2 section.
  • the N_add value is a negative value
  • the SSB index for initial terminal detection attempts is [0,4] in relation to the SSB index range to be detected by the terminal.
  • SSB detection may be performed at the SSB index of [6, 7, 0, 2, 3, 4]. That is, SSB_indexes located in the interval -2 including the existing SSB index may be newly included.
  • the SSB index for initial terminal detection attempts is [0,4] in relation to the SSB index range to be detected by the terminal.
  • SSB detection may be performed at the SSB index of [7, 0, 1, 3, 4, 5]. That is, SSB_indexes including ⁇ 1 SSB indexes may be newly included.
  • the gNB may continuously deliver the SSB by the time density of the initial SSB indication field after LBT success.
  • Example 3 continuous execution is assumed for the aforementioned SSB indication. That is, like the existing NR, the gNB may transmit SSB indication information, that is, information on which the actual SSB is transmitted in the actual burst set, to the terminal. In this case, the gNB determines whether to transmit the SSB according to the LBT result for the determined location. Therefore, since SSB transmission may not be possible at the next time point, successive SSB transmissions may be performed as much as the existing time density at the time of LBT success. Through this, more accurate SSB transmission is possible to the terminal. In this case, the number of SSBs continuously transmitted by the UE may be the same as the number of SSBs in the SSB burst set. That is, even though it is not transmitted from its own transmission location, it is possible to perform continuous transmission. As shown in FIG. 20, group-wise or continuous transmission may be performed based on a successful time of LBT.
  • SSB indication information that is, information on which the actual SSB is transmitted
  • the gNB may continuously transmit by the time density after performing the LBT once again at the next SSB index time point.
  • continuous SSB detection may be performed at the transmission point of the SSB indication field.
  • the UE may perform detection assuming N SSB continuous transmissions based on the index on which the actual SSB is transmitted based on the SSB indication information.
  • a shift pattern may be applied to SSB transmission.
  • the single SSB indication information may be provided in the same manner as the existing NR.
  • the UE can basically know that the SSB index provided by the shift pattern is additionally detected in addition to the SSB detection range based on the existing SSB indication information.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of an LBT result can be provided.
  • a beam management method for instructing a beam between a reference RS and a target RS is introduced.
  • TCI transmission configuration indicator
  • This may mean that beam pairing information is provided for a reference signal RS used for data channel estimation and CSI estimation. In addition, it may include whether the beam pairing between the TRP and the terminal. Quasi co-location (QCL) information used for beam pairing between RSs is informed to the UE.
  • the QCL type may mean a step of classifying a degree of channel similarity between two RSs as follows.
  • Channel similarity with respect to Quasi co-location (QCL) Type is: ⁇ Doppler shift, Doppler spread, average delay, delay spread ⁇ in QCL Type A, ⁇ Doppler shift, Doppler spread ⁇ in QCL Type B, ⁇ average in QCL Type C delay, Doppler shift ⁇ , and QCL Type D may be classified into ⁇ Spatial Rx parameter ⁇ .
  • L1-RSRP is introduced for beam estimation.
  • L1-RSRP is performed through SSB and CSI-RS.
  • transmission of two RSs is determined according to whether LBT is successful.
  • a beam pairing determination method according to whether SSB / CSI-RS is transmitted and a beam estimation method of a terminal will be described below.
  • the SSB will be described, but the same may be applied to the CSI-RS.
  • Embodiment 5 In SSB / CSI-RS transmission for beam estimation, N consecutive SSB / CSI-RS transmissions may be performed at the time of LBT success.
  • Embodiment 5 proposes continuous transmission in SSB / CSI-RS transmission for beam estimation.
  • different directional beams may be configured in the SSB or CSI-RS resources to find an optimal transmission beam.
  • the UE may derive the estimated L1-RSRP value based on the SSB index or the CSI-RS resource index received at a predetermined location according to the set SSB or CSI-RS transmission period. Therefore, in Embodiment 5, in consideration of the characteristics of the NR-U, the continuous transmission mode in the SSB or CSI-RS transmission in the beam management step, including beam sweeping and beam refinement steps, Can be introduced.
  • the SSB may perform continuous SSB transmission from the time of LBT success.
  • the transmission density (density) in the SSB burst of the SSB is equal to 4/8.
  • SSB transmission is performed at any location within the SSB burst.
  • SSB transmission can be performed while maintaining the same SSB transmission density at the time of LBT success.
  • 'N SSB_TX ' may be separately designated for the SSB transmission density and may be different from the value set for the existing synchronization signal setting. This value may be transmitted to the terminal through higher layer signaling.
  • CSI-RS transmission can support continuous transmission in the time domain by the number of CSI-RS resources regardless of the set transmission period. For example, assume that all four CSI-RS resources are configured as shown in FIG. 22. In this case, after the LBT succeeds, CSI-RS transmission for beam control may be performed as shown in the continuous transmission. That is, regardless of the transmission period and the transmission position (time offset) of the CSI-RS resources, it may mean that the continuous CSI-RS transmission after the LBT success.
  • Example 5-1 If the SSB transmission position is changed according to the LBT result, the beamforming pattern may be applied from the SSB index at the changed time.
  • the gNB can always transmit the SSB at a predetermined time point. Accordingly, different beamforming may be applied to each SSB in the SSB burst set, and such beam application may be set to be repeated in the SSB burst set of the next period.
  • NR-U since beam transmission is performed after LBT, it is not guaranteed that the SSB is always transmitted at a predetermined position. Accordingly, the following beam transmission may be considered in the case where the NR-U does not always transmit the transmission time point of the SSB at the same location.
  • beam information for each SSB index in the SSB burst must be updated in SSB burst #N, but an error may occur in beam update and beam estimation because Beam P0 is transmitted in SSB # 0 and SSB # 2.
  • the LBT-based SSB transmission method as shown in FIG. 23 is maintained, but the beam is always set to the UE at the time of SSB # 0 to 3 set to the first higher layer signaling. That is, if the SSB transmission time point is changed according to the LBT, it may be assumed that the corresponding beam information is the same as SSB # 0 although the position where the actual SSB is transmitted (SSB # 2) is different. For example, if the LBT is successful at the initial position and the beam P1 is set and transmitted at SSB index # 0, and if the LBT is successful at SSB index # 2 of the next SSB burst #N, the beam P1 is transmitted at SSB index # 2.
  • the terminal may update the beam estimation value of SSB # 0 in SSB busrt # 0 to the beam estimation value of SSB # 2 in SSB busrt #N.
  • the value reported by the UE to the gNB becomes SSB index # 0, which is an initial configuration value.
  • Example 5-2 When the SSB transmission position is changed according to the LBT result, the next SSB index beamforming pattern may be applied based on the cyclic pattern.
  • the present embodiment may apply the same beamforming to each SSB index.
  • beam mapping of the SSB indexes newly included in the transmission region may be applied based on a cyclic pattern. For example, as shown in FIG. 24, the SSB transmission positions set through the first higher layer signaling become # 0 to # 3. However, it is assumed that synchronization signal transmission is performed at SSB index # 2 according to the result of the LBT. At this time, the beam is not set in # 4 and # 5, so additional setting is necessary.
  • beam mapping may be performed on all SSB indexes in a cyclic pattern form with respect to a beam pattern initially set for SSBs in an SSB burst.
  • Cyclic pattern form can be predefined, the pattern can be determined in consideration of the actual SSB density transmitted in the SSB burst.
  • Embodiment 6 When the SSB / CSI-RS for beam estimation performs N consecutive SSB / CSI-RS transmissions at the time of LBT success, the terminal assumes that the SSB / CSI-RS initial reception time is a reference time point. can do.
  • Embodiment 5 a beam setting method based on continuous SSB / CSI-RS transmission for beam control and estimation has been described.
  • the operation of the terminal for beam estimation will be described.
  • SSB transmission which is the most basic synchronization signal, is also determined according to the success or failure of the LBT. Accordingly, the beam sweeping and beam refinement steps, which are basic procedures for beam management, require transmission of the previously set beam.
  • NR resource allocation and transmission period of SSB and CSI-RS can be configured through higher layer signaling.
  • NR-U adopts this setting structure, transmission of the corresponding signal is impossible if LBT is not successful at a desired time.
  • the gNB may perform SSB / CSI-RS transmission with different beam setup at a specific location.
  • the terminal may assume a reference point for updating the reception position and beam information for the SSB / CSI-RS.
  • UE operation can be designated for two modes of applying and not applying a reference point to a location where SSB / CSI-RS reception is performed.
  • Example 6-1 Application of Reference Point to Derivation of L1-RSRP Based on SSB / CSI-RS of UE
  • the reference point of this embodiment may mean an SSB / CSI-RS transmission point (particularly, a time base position) defined as the first higher layer signaling during SSB / CSI-RS transmission.
  • the UE may assume that the SSB is to be transmitted in the corresponding SSB index and perform SSB reception. Therefore, the initially set SSB indication field becomes a reference point.
  • the beam information that is, the L1-RSRP value is updated in the initially set SSB / CSI-RS resource region. can do. That is, even if the L1-RSRP value is derived from another SSB index / CSI-RS resource index, the terminal may update the beam estimation value or the L1-RSRP with the SSB index or the CSI-RS resource index value initially set.
  • an indication field initially set for SSBs for which actual transmission is performed within an initially set SSB burst may be designated as a reference point.
  • the LBT succeeds in the normal position and performs the same SSB transmission as the reference point.
  • the LBT succeeds at a later point than the reference point and transmits from the SSB index # 2.
  • the actual terminal assumes that the beam settings of the section in which the SSB is transmitted are as shown in FIG.
  • the terminal may update the beam information or the estimated value estimated at SSB index # 2 of the second SSB transmission interval to SSB index # 0 which is a reference point.
  • SSB index # 3 5
  • the same principle can be applied to SSB index # 1-3 of reference point.
  • the gNB may correctly obtain beam information of the corresponding UE based on the value reported by the UE.
  • the above description can be applied substantially the same in the case of CSI-RS.
  • Example 6-2 Non-application of reference point for SSB / CSI-RS based L1-RSRP derivation of UE
  • the position is the SSB / CSI-RS estimated elsewhere, the corresponding SSB index / CSI-
  • the derived value of the RS resource index position can be used as it is. When updating, you can update at the same index point.
  • an indication field initially set for SSBs for which actual transmission is performed within an initially set SSB burst may be designated as a reference point.
  • the LBT succeeds in the normal position and performs the same SSB transmission as the reference point.
  • the LBT succeeds at a later point than the reference point and transmits from the SSB index # 2.
  • the UE does not know the actual beam estimation information, and may update the beam information or the estimated value estimated in SSB index # 2 of the second SSB transmission interval to SSB index # 2 which is a reference point.
  • the same principle can be used to update the reference point SSB index # 3-5.
  • the gNB may correctly obtain beam information of the corresponding UE based on the value reported by the UE.
  • the same may be applied.
  • the beam setting structure of the above-described embodiment 5-1 may be required.
  • the gNB has already set SSB indexes # 0 to 3 to which SSB indexes are actually transmitted. However, through the beam estimation result reporting of the terminal, as shown in FIG. 26, the beam estimation result may be obtained even if the position is not determined. Therefore, the gNB may also regard reporting of other SSB indexes in the SSB burst as a normal beam estimation procedure rather than the initially set SSB indexes.
  • the terminal may also perform synchronization signal detection of SSB index points other than the SSB indexes initially set.
  • Embodiment 7 When the SSB is transmitted in a slot other than the SSB through the initial RRC configuration, it may additionally refer to the SSB position in the slot / slot in which the SSB is transmitted.
  • SSBs in which actual transmission occurs in the SSB burst are referred to through RRC signaling.
  • the size of the bit is L, and has a length of '4, 8, 64'.
  • the UE when the UE normally receives the RRC signaling regardless of whether or not the SSB is received, the UE knows the positions of the SSBs transmitted by the gNB and may know whether the PDSCH and the SSB overlap with the corresponding position. Accordingly, the UE can know whether rate-matching is performed on the received PDSCH data of the SSB transmission position, thereby performing normal PDSCH detection and demodulation.
  • the UE may refer to the actual transmission of the SSB in the PDSCH. There is a need.
  • Example 7-1 PDCCH monitoring can be performed to change the SSB position.
  • the SSB change of the NR-U may be performed in a slot or multiple slot unit. That is, the location in which the SSB is transmitted may be indicated through a group-common PDCCH or a UE-specific PDCCH in CORSET.
  • an RNTI for monitoring whether an SSB is changed may be defined as a PI_ssb RNTI.
  • PI_ssb RNTI may be named by another name having the same meaning.
  • the UE that detects the PI_ssb RNTI can recognize the SSB index actually transmitted within the SSB burst of the previous slot. Accordingly, the UE may puncture the SSB overlapping region or perform rate-matching on the corresponding region in the buffer for PDSCH detection of the corresponding slot. That is, the UE can know the presence or absence of rate-matching / puncturing for PDSCH detection according to the presence or absence of 'N_p X 2' SSB transmissions for the 'N_p' slot located in the slot preceding the SSB position change monitoring. .
  • the UE may perform SSB # 2 for the presence or absence of SSB transmission located in the previous 2 slots. Only 3 can see that the SSB was actually sent. Accordingly, the UE may interpret that the SSB is not actually transmitted in SSB # 0, 1 of Slot # 0, and all PDSCHs are transmitted, and may perform PDSCH decoding. Next, since the synchronization signal is actually transmitted to SSB # 2, 3 in Slot # 1, the UE may perform the PDSCH detection on the assumption that the signal of the corresponding region is rate-matched or puncturing.
  • Example 7-2 The gNB always sets the transmission state for specific SSB indexes in the SSB burst and signals the terminal.
  • the NR-U signals to the UE that the SSB may be transmitted from other SSBs in the SSB burst instead of the initially set area, and the UE receives a slot including the additionally transmitted SSBs based on the received information.
  • PDSCH When PDSCH is detected, it may be assumed that the region overlapping with the SSB is rate-matched or punctured.
  • the UE may assume that the SSB is transmitted only in SSB index # 0, 1, and that the PDSCH data is transmitted intact in the remaining areas.
  • the information on the additional SSB transmission region in the SSB burst may be transmitted to the terminal through DCI or additionally configured in the terminal through RRC.
  • both can be transmitted through Group-common PDCCH or UE-specific PDCCH.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of an LBT result can be provided.
  • FIG. 28 is a diagram illustrating a configuration of a user equipment (UE) according to another embodiment.
  • a user terminal 2800 includes a controller 2810, a transmitter 2820, and a receiver 2830.
  • the controller 2810 controls the overall operation of the user terminal 2800 according to the method for performing wireless communication in the unlicensed band required to perform the above-described present disclosure.
  • the transmitter 2820 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the receiver 2830 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the receiver 2830 may receive configuration information on a synchronization signal block (SSB) burst set in an unlicensed band.
  • the receiver 2830 may receive configuration information on an SSB burst set for receiving the SSB from the base station.
  • the configuration information may include information on period or duration of the SSB burst set.
  • the number of SSBs in the SSB burst set is 8 at 15 kHz SCS. Since a total of two SSBs may be transmitted in one slot, the SSB transmission position may be set in four slots within the SSB burst.
  • the receiver 2830 may receive transmission interval information in which the SSB is transmitted in the SSB burst set based on the result of Listen Before Talk (LBT) for the unlicensed band.
  • LBT Listen Before Talk
  • the base station may transmit the SSB through the radio channel of the unlicensed band.
  • the SSB always transmitted at a predetermined time point may not be transmitted in the slot set for the unlicensed band. Accordingly, when the LBT fails, transmission interval information for indicating the SSB index in which the SSB is transmitted in the SSB burst set may be set.
  • the transmission section information in which the SSB is transmitted in the SSB burst set including information on the change of the SSB transmission location according to the LBT failure may be received by the receiver 2830.
  • the transmission interval information may include SSB index information in which the SSB is actually transmitted because LBT succeeds in the SSB burst set.
  • the arrangement of the SSB index to which the SSB is actually transmitted may be flexibly set in a plurality of patterns, and the selected pattern may be applied according to a predetermined criterion.
  • the SSB index to which the SSB is actually transmitted may be indicated through RRC signaling or RMSI.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include transmitting an SSB not transmitted in the SSB index in which the LBT fails in the SSB burst set after the SSB transmitted in the SSB index in which the LBT succeeds. It may include click pattern (cyclic pattern) information. For example, it is assumed that the SSB transmission position that is set most recently through higher layer signaling is SSB index # 0 to # 3. If the LBT is successful in SSB index # 2, the continuous transmission of the SSB may be performed in SSB index # 2 ⁇ # 5.
  • the gNB may always transmit the SSB at a predetermined time point. Accordingly, different beamforming may be applied to each SSB in the SSB burst set, and such beam application may be set to be repeated in the SSB burst set of the next period.
  • the beam transmission setting for the case where the transmission time of the SSB is not always transmitted at the same location may be considered.
  • beam mapping may be performed on all SSB indexes in the form of a cyclic pattern with respect to the beam pattern initially set for the SSBs in the SSB burst.
  • Cyclic pattern form can be predefined, the pattern can be determined in consideration of the actual SSB density transmitted in the SSB burst. For example, a beam pattern set for SSB index # 0 and # 1 may be applied to SSB index # 4 and # 5.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include shift value information indicating an SSB index for additionally transmitting the SSB in the SSB burst set.
  • the controller 2810 basically detects the SSB index provided by the shift pattern in addition to the SSB detection range based on the existing SSB indication information. can do.
  • the controller 2810 may detect the SSB in the SSB burst set based on the transmission interval information. Transmission interval information including the SSB index in which the SSB is transmitted in the SSB burst set may be indicated through RRC signaling or RMSI. The controller 2810 may detect the SSB in the slot corresponding to the SSB index in which the SSB is transmitted in the SSB burst set based on the transmission interval information. That is, the controller 2810 may detect the SSB at a position other than the initially set position according to the result of the LBT. The controller 2810 may acquire synchronization and update system information based on the detected SSB.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of an LBT result can be provided.
  • 29 is a diagram illustrating a configuration of a base station 2900 according to another embodiment.
  • a base station 2900 includes a controller 2910, a transmitter 2920, and a receiver 2930.
  • the controller 2910 controls the overall operation of the base station 2900 according to the method for performing wireless communication in the unlicensed band required to perform the above-described present disclosure.
  • the transmitter 2920 and the receiver 2930 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described disclosure.
  • the transmitter 2920 may transmit configuration information about a synchronization signal block (SSB) burst set in an unlicensed band.
  • SSB synchronization signal block
  • the SSB is defined and transmitted as an SSB burst set rather than a single type.
  • the transmitter 2920 may transmit configuration information on the SSB burst set for transmitting the SSB to perform initial access in the unlicensed band of the terminal.
  • the configuration information may include information on period or duration of the SSB burst set.
  • the controller 2910 may perform List Before Talk (LBT) on the SSB burst set in the unlicensed band.
  • LBT List Before Talk
  • the transmitter 2920 may transmit the SSB through the radio channel of the unlicensed band.
  • the transmitter 2920 may transmit transmission interval information in which the SSB is transmitted in the SSB burst set based on the LBT result. That is, in the unlicensed band, since the base station performs LBT during the actual SSB transmission, and SSB transmission is performed after the LBT is successful, the SSB transmission at the initial set time cannot be guaranteed. Accordingly, transmission interval information in which the SSB is transmitted in the SSB burst set including information on the change of the SSB transmission position according to the LBT failure may be transmitted to the terminal.
  • the transmission interval information may include SSB index information in which the SSB is actually transmitted because LBT succeeds in the SSB burst set.
  • the arrangement of the SSB index to which the SSB is actually transmitted may be flexibly set in a plurality of patterns, and the selected pattern may be applied according to a predetermined criterion.
  • the SSB index to which the SSB is actually transmitted may be indicated through RRC signaling or RMSI.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include transmitting an SSB not transmitted in the SSB index in which the LBT fails in the SSB burst set after the SSB transmitted in the SSB index in which the LBT succeeds. It may include click pattern (cyclic pattern) information. For example, it is assumed that the SSB transmission position that is set most recently through higher layer signaling is SSB index # 0 to # 3. If the LBT is successful in SSB index # 2, the continuous transmission of the SSB may be performed in SSB index # 2 ⁇ # 5.
  • the gNB may always transmit the SSB at a predetermined time point. Accordingly, different beamforming may be applied to each SSB in the SSB burst set, and such beam application may be set to be repeated in the SSB burst set of the next period.
  • the beam transmission setting for the case where the transmission time of the SSB is not always transmitted at the same location may be considered.
  • beam mapping may be performed on all SSB indexes in the form of a cyclic pattern with respect to the beam pattern initially set for the SSBs in the SSB burst.
  • Cyclic pattern form can be predefined, the pattern can be determined in consideration of the actual SSB density transmitted in the SSB burst. For example, a beam pattern set for SSB index # 0 and # 1 may be applied to SSB index # 4 and # 5.
  • the transmission interval information in which the SSB is transmitted in the SSB burst set may include shift value information indicating an SSB index for additionally transmitting the SSB in the SSB burst set.
  • the terminal may additionally detect the SSB index provided by the shift pattern in addition to the SSB detection range based on the existing SSB indication information.
  • Transmission interval information including the SSB index in which the SSB is transmitted in the SSB burst set may be indicated through RRC signaling or RMSI.
  • the terminal may detect the SSB in the slot corresponding to the SSB index in which the SSB is transmitted in the SSB burst set based on the transmission interval information. That is, the terminal may detect the SSB at a position other than the initially set position according to the result of the LBT.
  • the terminal may acquire synchronization and update system information based on the detected SSB.
  • a method and apparatus for performing wireless communication in an unlicensed band that can minimize the complexity of transmitting and receiving a sync signal block in consideration of an LBT result can be provided.
  • the above-described embodiments may be implemented through various means.
  • the embodiments may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to the embodiments may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs. (Field Programmable Gate Arrays), a processor, a controller, a microcontroller or a microprocessor may be implemented.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • a processor a controller, a microcontroller or a microprocessor may be implemented.
  • the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function for performing 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 by various known means.
  • system generally refer to computer-related entity hardware, hardware and software. May mean a combination of, software or running software.
  • the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, a thread of execution, a program, and / or a computer.
  • an application running on a controller or processor and a controller or processor can be components.
  • One or more components may be within a process and / or thread of execution, and the components may be located on one device (eg, system, computing device, etc.) or distributed across two or more devices.

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

Abstract

Les modes de réalisation de la présente invention concernent un procédé et un dispositif d'exécution d'une transmission sans fil dans une bande sans licence. Un mode de réalisation concerne un procédé destiné à exécuter, par un terminal, une transmission sans fil dans une bande sans licence, comprenant les étapes consistant à : recevoir des informations de configuration relatives à un ensemble de rafales de bloc de signal de synchronisation (SSB) dans une bande sans licence ; recevoir des informations d'intervalle de transmission dans lesquelles une SSB est transmise dans l'ensemble de rafales SSB sur la base d'un résultat d'écoute avant d'émettre (LBT) par rapport à la bande sans licence ; et détecter la SSB dans l'ensemble de rafales SSB sur la base des informations d'intervalle de transmission.
PCT/KR2019/008606 2018-07-13 2019-07-11 Procédé et dispositif d'exécution d'une transmission sans fil dans une bande sans licence WO2020013645A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980029209.1A CN112042217B (zh) 2018-07-13 2019-07-11 用于在非许可频带中执行无线通信的方法和设备
US17/051,351 US11516857B2 (en) 2018-07-13 2019-07-11 Method and device for performing wireless communication in unlicensed band

Applications Claiming Priority (6)

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KR10-2018-0081886 2018-07-13
KR20180081886 2018-07-13
KR10-2018-0093040 2018-08-09
KR20180093040 2018-08-09
KR1020190083074A KR102297101B1 (ko) 2018-07-13 2019-07-10 비면허 대역에서 무선 통신을 수행하는 방법 및 장치
KR10-2019-0083074 2019-07-10

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WO2022011649A1 (fr) * 2020-07-16 2022-01-20 北京小米移动软件有限公司 Procédé de réglage de faisceau, dispositif de réglage de faisceau et support de stockage
WO2022032155A1 (fr) * 2020-08-07 2022-02-10 Intel Corporation Indication de détection directionnelle par l'intermédiaire d'une infrastructure de quasi-co-localisation (qcl)
CN116210165A (zh) * 2020-07-22 2023-06-02 联想(北京)有限公司 具有l1-rsrp测量的用于多trp dl传输的基于群组的波束报告

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210336687A1 (en) * 2020-04-24 2021-10-28 Qualcomm Incorporated Modification of ssb burst pattern
US12021598B2 (en) * 2020-04-24 2024-06-25 Qualcomm Incorporated Modification of SSB burst pattern
WO2022011649A1 (fr) * 2020-07-16 2022-01-20 北京小米移动软件有限公司 Procédé de réglage de faisceau, dispositif de réglage de faisceau et support de stockage
CN116210165A (zh) * 2020-07-22 2023-06-02 联想(北京)有限公司 具有l1-rsrp测量的用于多trp dl传输的基于群组的波束报告
WO2022032155A1 (fr) * 2020-08-07 2022-02-10 Intel Corporation Indication de détection directionnelle par l'intermédiaire d'une infrastructure de quasi-co-localisation (qcl)

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