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WO2019221475A1 - Procédé et dispositif de transmission d'informations de rétroaction harq dans une bande sans licence - Google Patents

Procédé et dispositif de transmission d'informations de rétroaction harq dans une bande sans licence Download PDF

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Publication number
WO2019221475A1
WO2019221475A1 PCT/KR2019/005760 KR2019005760W WO2019221475A1 WO 2019221475 A1 WO2019221475 A1 WO 2019221475A1 KR 2019005760 W KR2019005760 W KR 2019005760W WO 2019221475 A1 WO2019221475 A1 WO 2019221475A1
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WO
WIPO (PCT)
Prior art keywords
information
pucch
harq feedback
unlicensed band
dci format
Prior art date
Application number
PCT/KR2019/005760
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English (en)
Korean (ko)
Inventor
박규진
Original Assignee
주식회사 케이티
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020180150160A external-priority patent/KR20190132183A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to CN201980032985.7A priority Critical patent/CN112136286B/zh
Priority to US17/055,810 priority patent/US11949513B2/en
Publication of WO2019221475A1 publication Critical patent/WO2019221475A1/fr

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    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present embodiments propose a method and apparatus for transmitting HARQ feedback information in an unlicensed band in a next generation wireless access network (hereinafter, referred to as "NR").
  • 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.
  • Embodiments of the present disclosure may provide a specific method and apparatus capable of transmitting HARQ feedback information for reception of a downlink data channel in an unlicensed band.
  • embodiments of the present disclosure may provide a specific method and apparatus capable of transmitting an uplink control channel (PUCCH) including various uplink control information in an unlicensed band.
  • PUCCH uplink control channel
  • the present embodiment is a method for transmitting HARQ feedback information in the unlicensed band, the terminal, receiving downlink control information including resource allocation information for the downlink data channel (PDSCH) in the unlicensed band,
  • the method may include receiving HARQ timing indication information for transmitting HARQ feedback information in the unlicensed band and transmitting HARQ feedback information in the unlicensed band according to the HARQ timing indication information.
  • embodiments of the present invention provide a method for a base station to receive HARQ feedback information in an unlicensed band, transmitting downlink control information including resource allocation information for a downlink data channel (PDSCH) in an unlicensed band,
  • the method may include transmitting HARQ timing indication information for transmitting HARQ feedback information in the unlicensed band and receiving HARQ feedback information in the unlicensed band according to the HARQ timing indication information.
  • PDSCH downlink data channel
  • the present embodiment in a terminal transmitting HARQ feedback information in an unlicensed band, receives downlink control information including resource allocation information for a downlink data channel (PDSCH) in an unlicensed band, and the unlicensed band
  • the UE may include a receiver for receiving HARQ timing indication information for transmitting HARQ feedback information and a transmitter for transmitting HARQ feedback information in the unlicensed band according to the HARQ timing indication information.
  • the present embodiments in the base station receiving HARQ feedback information in the unlicensed band, transmits downlink control information including resource allocation information for the downlink data channel (PDSCH) in the unlicensed band, and the unlicensed band
  • a base station may include a transmitter for transmitting HARQ timing indication information for transmitting HARQ feedback information and a receiver for receiving HARQ feedback information in an unlicensed band according to HARQ timing indication information.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band for transmitting HARQ feedback information for reception of a downlink data channel in an unlicensed band can be provided.
  • a specific method and apparatus capable of transmitting an uplink control channel (PUCCH) including various uplink control information in an unlicensed band can be provided.
  • PUCCH uplink control channel
  • 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 among different SCSs in different SCSs to which the present embodiment can be applied.
  • FIG. 9 is a diagram illustrating a conceptual example of a bandwidth part to which the present embodiment can be applied.
  • FIG. 10 is a diagram illustrating a procedure of transmitting HARQ feedback information by an MS in an unlicensed band according to an embodiment.
  • 11 is a diagram illustrating a procedure for receiving HARQ feedback information in an unlicensed band by a base station according to an embodiment.
  • FIG 12 illustrates an example of performing LBT for wireless communication in an unlicensed band according to an embodiment.
  • 13 to 17 are diagrams for describing a DCI format according to an embodiment.
  • 20 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • 21 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 defined as “after,” “after,” “after,” and “before. 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 means a method for transmitting and receiving data to the base station by the terminal
  • 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 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 fixed subcarrier spacing of LTE, one of the 4G communication technologies. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, 120 kHz, and the subcarrier spacing used for synchronous signal transmission is 15, 30, 12, 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, and 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, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined with a fixed time length, the slot is defined by the number of symbols, the time length may vary according to the subcarrier interval.
  • 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.
  • 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 on 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 the scheduling of 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, a 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.
  • RAN WG1 has a frame structure for each new radio (NR). (frame structure), channel coding & modulation (waveform & multiple access scheme), etc. design is in progress.
  • NR is required to be designed to meet various QoS requirements required for each detailed and detailed service scenario as well as improved data rate compared to LTE / LTE-Advanced.
  • eMBB enhancement Mobile BroadBand
  • MMTC massive machine type communication
  • URLLC Ultra Reliable and Low Latency Communications
  • Each service scenario is a frequency constituting an arbitrary NR system because the requirements for data rates, latency, reliability, coverage, etc. are different from each other.
  • a radio resource unit based on different numerology (e.g., subcarrier spacing, subframe, TTI, etc.) as a method for efficiently satisfying each service scenario needs through a band. There is a need for a method of efficiently multiplexing (multiplexing).
  • TDM, FDM, or TDM / FDM based on one or a plurality of NR component carriers (s) for numerology having different subcarrier spacing values.
  • a method of supporting multiplexing and a scheduling unit in a time domain a method of supporting one or more time units has been discussed.
  • a subframe is defined as a kind of time domain structure, and reference numerology is used to define a subframe duration.
  • reference numerology is used to define a subframe duration.
  • the LTE it was decided to define a single subframe duration consisting of 14 OFDM symbols of the same 15kHz sub-carrier spacing (SCS) -based normal CP overhead.
  • SCS sub-carrier spacing
  • the subframe has a time duration of 1 ms.
  • subframes of NR are absolute reference time durations
  • slots and mini-slots are time units based on actual uplink / downlink data scheduling.
  • any slot consists of 14 symbols, and according to the transmission direction of the slot, all symbols are used for DL transmission or all symbols are UL transmission (UL). It may be used for transmission or in the form of a downlink portion (DL portion) + a gap (gap) + uplink portion (UL portion).
  • a short slot time-domain scheduling interval for transmitting / receiving uplink / downlink data is defined based on a mini-slot consisting of fewer symbols than the slot in an arbitrary number (numerology) (or SCS).
  • a scheduling interval may be set, or a long time-domain scheduling interval for transmitting / receiving uplink / downlink data may be configured through slot aggregation.
  • latency critical data such as URLLC
  • it is based on 1ms (14 symbols) defined in a numerology-based frame structure with small SCS value such as 15kHz.
  • SCS value such as 15kHz.
  • a mini slot consisting of fewer OFDM symbols than the corresponding slot is defined and based on this, critical to the same delay rate as the corresponding URLLC. (latency critical) may be defined so that scheduling is performed for data.
  • a number of numerology having different SCS values in one NR carrier is supported for each numerology.
  • Scheduling data according to a latency requirement based on a defined slot (or mini slot) length is also considered. For example, as shown in FIG. 8 below, when the SCS is 60 kHz, since the symbol length is reduced by about 1/4 compared to the case of the SCS 15 kHz, when one slot is formed of the same 14 OFDM symbols, The slot length is 1ms, while the 60kHz-based slot length is reduced to about 0.25ms.
  • L1 control information such as DL assignment Downlink Control Information (DCI) and UL Grant DCI is transmitted and received through a PDCCH.
  • a control channel element (CCE) is defined as a resource unit for transmitting the PDCCH, and in the NR, a control resource set (CORESET), which is a frequency / time resource for transmitting the PDCCH, may be set for each terminal.
  • each CORESET may be configured with one or more search spaces consisting of one or more PDCCH candidates for monitoring the PDCCH.
  • the detailed description of the parts described in 3GPP TS 38.211 and TS 38.213 of the PDCCH-related details will be omitted for convenience. However, it may be included in the present disclosure.
  • a scalable bandwidth operation for any LTC CC is supported. That is, according to the frequency deployment scenario (deployment scenario) in any LTE carrier to configure a single LTE CC, a minimum bandwidth of 1.4 MHz to 20 MHz could be configured, the normal LTE terminal is one LTE For the CC, the transmit / receive capability of 20 MHz bandwidth was supported.
  • bandwidth part (s)
  • activation through different bandwidth part configuration
  • one or more bandwidth parts may be configured through one serving cell configured from a terminal perspective, and the corresponding UE may include one downlink bandwidth part (s) in a serving cell.
  • DL bandwidth part) and one uplink bandwidth part (UL bandwidth part) by activation (activation) was defined to be used for transmitting and receiving uplink / downlink data.
  • activation activation
  • an initial bandwidth part for an initial access procedure of a terminal is defined in a serving cell, and one or more terminals are specified through dedicated RRC signaling for each terminal.
  • a bandwidth part (s) may be configured, and a default bandwidth part for a fallback operation may be defined for each terminal.
  • a plurality of downlink and / or uplink bandwidth parts are simultaneously activated and used according to the capability and bandwidth part (s) configuration of the terminal.
  • s capability and bandwidth part
  • only one downlink bandwidth part and one uplink bandwidth part may be activated at an arbitrary time in an arbitrary terminal in NR rel-15. .
  • 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.
  • the NR-U deployment scenario of unlicensed band NR unlike the existing LTE, which always supported unlicensed spectrum through carrier aggregation (CA) with a licensed spectrum.
  • CA carrier aggregation
  • 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.
  • the present disclosure proposes a method for transmitting an uplink control channel of a terminal in an NR-U cell.
  • FIG. 10 is a diagram illustrating a procedure of a terminal performing List Before Talk (LBT) for wireless communication in an unlicensed band according to an embodiment.
  • LBT List Before Talk
  • the terminal may receive downlink control information including resource allocation information for a downlink data channel (PDSCH) in an unlicensed band (S1000).
  • PDSCH downlink data channel
  • S1000 unlicensed band
  • the terminal may receive the downlink data channel from the base station based on the resource allocation information included in the downlink control information.
  • the terminal may transmit HARQ ACK / NACK feedback information to the base station as to whether to receive the downlink data channel.
  • the terminal may receive HARQ timing indication information for transmitting HARQ feedback information in the unlicensed band (S1010).
  • the UE may receive a resource allocation and feedback timing K1 value for an uplink control channel (PUCCH) for HARQ feedback through a DL assignment DCI.
  • the feedback timing K1 value may be set through RRC signaling.
  • the terminal may transmit the HARQ feedback information according to whether the downlink data channel is received based on the received resource allocation and the K1 value of the feedback timing.
  • the UE when using the unlicensed band, when the corresponding unlicensed band is occupied by another node in the slot according to the K1 value indicated by the base station, it may be difficult for the terminal to transmit the PUCCH at the indicated timing. Therefore, according to an example, when the base station performs the LBT (Listen Before Talk) to access the unlicensed band, the UE may be notified of this, thereby triggering the PUCCH transmission of the UE.
  • LBT Listen Before Talk
  • the PUCCH transmission triggering information may be defined through a UE-group common DCI format (UE-group common DCI format) for the corresponding PUCCH transmission triggering and transmitted through the UE-group common PDCCH.
  • the PUCCH transmission triggering information may be defined through a UE-specific DCI format (UE-specific DCI format) for the corresponding PUCCH transmission triggering may be transmitted through the UE-specific PDCCH (UE-specific PDCCH).
  • the PUCCH triggering DCI format set separately may include resource allocation information for the PUCCH and a K3 value that is PUCCH transmission timing information.
  • the K3 value may be set as a timing gap between a reception slot of a corresponding PUCCH triggering DCI format and a PUCCH transmission slot of a terminal accordingly.
  • the PUCCH triggering DCI format includes only PUCCH resource allocation information
  • the K3 value is set by the base station through UE-specific / cell-specific higher layer signaling. Can be.
  • the K3 value can be set to any fixed value.
  • the PUCCH triggering DCI format may be set to include only a K3 value.
  • the PUCCH resource allocation information to be transmitted by each terminal may be configured to be included in a DL assignment DCI format.
  • a PUCCH resource for HARQ feedback of a UE for a PDSCH is allocated through a separate PUCCH triggering DCI format, which is distinguished from a downlink allocation DCI format, configuration or indication information for this is explicitly transmitted from a base station to a corresponding UE. Or may be signaled implicitly.
  • whether PUCCH resources are allocated through the PUCCH triggering DCI format may be configured by a base station through UE-specific or cell-specific RRC signaling.
  • the UE receives PUCCH resource allocation information through a PUCCH resource indicator included in a downlink allocation DCI format.
  • the configuration information may be indicated through DCI format 1_0 or DCI format 1_1, which is a downlink allocation DCI format including PDSCH resource allocation information. That is, when allocating resources for the PDSCH, the downlink allocation DCI format may include delay indication information indicating whether to delay the transmission of HARQ feedback information. This means that information on whether PUCCH resource allocation information is made through a PUCCH resource indicator of a downlink allocation DCI format or is delayed through a separate PUCCH triggering DCI format transmitted subsequently is signaled through the corresponding downlink allocation DCI format. Can mean being.
  • the corresponding DL allocation DCI format may include a separate information area for indicating delay indication information, for example, a PUCCH allocation flag information area.
  • the downlink allocation DCI format may be configured to indicate this by using an existing information area, for example, a PUCCH resource indicator information area.
  • delay indication information may be indicated according to K1 value indicated through a corresponding downlink allocation DCI format. That is, if the K1 value is greater than or equal to a certain threshold, the PUCCH resource allocation may be indicated through a separate PUCCH triggering DCI format. Alternatively, when the K1 value is smaller than the corresponding threshold value, PUCCH resource allocation may be performed through the PUCCH resource indicator of the corresponding DL allocation DCI format.
  • the specific threshold may be fixed to a specific value or may be set by cell base station through cell-sepcific / UE-specific RRC signaling.
  • the terminal may transmit HARQ feedback information in the unlicensed band according to the HARQ timing indication information (S1020).
  • the UE may transmit HARQ feedback information according to the received resource allocation information.
  • the UE allocates resource allocation information and timing information for transmission of HARQ feedback information from the base station.
  • the transmission of the HARQ feedback information may be delayed until receiving.
  • the UE may receive the PUCCH triggering DCI format.
  • the UE may transmit HARQ feedback information according to resource allocation information and timing information for the uplink control channel included in the PUCCH triggering DCI format. In this case, the UE may transmit all HARQ ACK feedback information pending when the PUCCH triggering DCI format is received through the corresponding PUCCH.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band for transmitting HARQ feedback information for reception of a downlink data channel in an unlicensed band can be provided.
  • HARQ feedback information is transmitted as UL control information (UCI)
  • UCI UL control information
  • the present invention is not limited thereto.
  • the UE may transmit all UCIs being held in the corresponding PUCCH. Can be sent via
  • a maximum payload size or a maximum codebook size that can be transmitted through any PUCCH may be set by the base station.
  • the configured maximum payload size or maximum codebook size may be UE-specific / cell-specific higher layer signaling, MAC CE signaling, or L1 control signaling. ) May be transmitted to the terminal.
  • the UE transmits the PUCCH according to the PUCCH triggering DCI format reception if the payload size of the pending UCI exceeds the maximum payload size, the UE drops a specific UCI. It can be set to.
  • a priority rule for UCI dropping may be set.
  • priority may be set for each UCI type.
  • priority may be defined in the order of SR> HARQ ACK feedback> CQI / CSI reporting.
  • this is merely an example and the present invention is not limited thereto. All cases of defining priorities for each other UCI type may be included in the scope of the present disclosure.
  • the dropping is performed in order of the most recent UCI, or in the order of the oldest UCI. can do.
  • an uplink control channel including various uplink control information in an unlicensed band.
  • 11 is a diagram illustrating a procedure for receiving HARQ feedback information in an unlicensed band by a base station according to an embodiment.
  • the base station may transmit downlink control information including resource allocation information for a downlink data channel (PDSCH) in an unlicensed band (S1100).
  • PDSCH downlink data channel
  • S1100 unlicensed band
  • the base station may transmit the downlink data channel to the terminal based on the resource allocation information included in the downlink control information.
  • the base station may receive HARQ ACK / NACK feedback information from the terminal as to whether to receive the downlink data channel.
  • the base station may transmit HARQ timing indication information for receiving HARQ feedback information in the unlicensed band (S1110).
  • the base station may transmit a resource allocation and feedback timing K1 value for the uplink control channel (PUCCH) for HARQ feedback to the terminal through a DL assignment DCI.
  • the feedback timing K1 value may be set through RRC signaling.
  • the base station may receive HARQ feedback information according to whether the downlink data channel is received based on the received resource allocation and K1 value of feedback timing.
  • the UE when using the unlicensed band, when the corresponding unlicensed band is occupied by another node in the slot according to the K1 value indicated by the base station, it may be difficult for the terminal to transmit the PUCCH at the indicated timing. Therefore, according to an example, when the base station performs the LBT (Listen Before Talk) to access the unlicensed band, the UE may be notified of this, thereby triggering the PUCCH transmission of the UE.
  • LBT Listen Before Talk
  • the PUCCH transmission triggering information may be defined through a UE-group common DCI format (UE-group common DCI format) for the corresponding PUCCH transmission triggering and transmitted through the UE-group common PDCCH.
  • the PUCCH transmission triggering information may be defined through a UE-specific DCI format (UE-specific DCI format) for the corresponding PUCCH transmission triggering may be transmitted through the UE-specific PDCCH (UE-specific PDCCH).
  • the PUCCH triggering DCI format set separately may include resource allocation information for the PUCCH and a K3 value that is PUCCH transmission timing information.
  • the K3 value may be set as a timing gap between a reception slot of a corresponding PUCCH triggering DCI format and a PUCCH transmission slot of a terminal accordingly.
  • the PUCCH triggering DCI format includes only PUCCH resource allocation information
  • the K3 value is set by the base station through UE-specific / cell-specific higher layer signaling. Can be.
  • the K3 value can be set to any fixed value.
  • the PUCCH triggering DCI format may be set to include only a K3 value.
  • the PUCCH resource allocation information to be transmitted by each terminal may be configured to be included in a DL assignment DCI format.
  • a PUCCH resource for HARQ feedback of a UE for a PDSCH is allocated through a separate PUCCH triggering DCI format, which is distinguished from a downlink allocation DCI format, configuration or indication information for this is explicitly transmitted from a base station to a corresponding UE. Or may be signaled implicitly.
  • whether PUCCH resources are allocated through the PUCCH triggering DCI format may be configured by a base station through UE-specific or cell-specific RRC signaling.
  • the UE receives PUCCH resource allocation information through a PUCCH resource indicator included in a downlink allocation DCI format.
  • the configuration information may be indicated through DCI format 1_0 or DCI format 1_1, which is a downlink allocation DCI format including PDSCH resource allocation information. That is, when allocating resources for the PDSCH, the downlink allocation DCI format may include delay indication information indicating whether to delay the transmission of HARQ feedback information. This means that information on whether PUCCH resource allocation information is made through a PUCCH resource indicator of a downlink allocation DCI format or is delayed through a separate PUCCH triggering DCI format transmitted subsequently is signaled through the corresponding downlink allocation DCI format. Can mean being.
  • the corresponding DL allocation DCI format may include a separate information area for indicating delay indication information, for example, a PUCCH allocation flag information area.
  • the downlink allocation DCI format may be configured to indicate this by using an existing information area, for example, a PUCCH resource indicator information area.
  • delay indication information may be indicated according to K1 value indicated through a corresponding downlink allocation DCI format. That is, if the K1 value is greater than or equal to a certain threshold, the PUCCH resource allocation may be indicated through a separate PUCCH triggering DCI format. Alternatively, when the K1 value is smaller than the corresponding threshold value, PUCCH resource allocation may be performed through the PUCCH resource indicator of the corresponding DL allocation DCI format.
  • the specific threshold may be fixed to a specific value or may be set by cell base station through cell-sepcific / UE-specific RRC signaling.
  • the base station may receive HARQ feedback information in the unlicensed band according to the HARQ timing indication information (S1120).
  • the base station may receive HARQ feedback information according to the received resource allocation information.
  • the base station transmits resource allocation information and timing information for transmission of HARQ feedback information. Until the transmission of the HARQ feedback information by the terminal may be delayed.
  • the base station can transmit the PUCCH triggering DCI format.
  • the base station may receive HARQ feedback information according to resource allocation information and timing information for the uplink control channel included in the PUCCH triggering DCI format. In this case, the base station may receive all HARQ ACK feedback information pending when the PUCCH triggering DCI format is received through the corresponding PUCCH.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band for transmitting HARQ feedback information for reception of a downlink data channel in an unlicensed band can be provided.
  • LBT List Before Talk
  • the base station in order to transmit PDSCH for an arbitrary UE in an NR-U cell of an unlicensed band configured by an arbitrary NR base station, the base station must perform LBT for the corresponding unlicensed band. As a result of performing LBT, when the radio channel of the corresponding unlicensed band is empty, the base station may transmit a PDCCH and a corresponding PDSCH to the terminal.
  • the terminal in order to transmit an uplink signal in the unlicensed band, the terminal also needs to perform LBT on the unlicensed band before transmitting the uplink signal.
  • a base station sets RRC signaling or instructs a corresponding terminal through DL assignment DCI (DL assignment DCI) for HARQ ACK / NACK feedback timing for PDSCH reception of a terminal.
  • DL assignment DCI DL assignment DCI
  • PUCCH transmission including HARQ ACK / NACK feedback information may not be possible at the time indicated by the base station according to the LBT result of the terminal. That is, when LBT failure occurs when the corresponding radio channel is occupied by another node as a result of LBT, the UE cannot transmit HARQ ACK / NACK feedback information according to PDSCH at the time indicated by the base station. do. This may cause serious degradation in HARQ performance in the NR-U cell.
  • FIG 12 illustrates an example of performing LBT for wireless communication in an unlicensed band according to an embodiment.
  • the base station may indicate whether to perform LBT on the corresponding terminal.
  • the UE may transmit uplink control information (UCI) such as HARQ ACK / NACK feedback information or CQI / CSI reporting information to the base station through the PUCCH.
  • UCI uplink control information
  • time resources and frequency resources which are PUCCH resources for transmitting HARQ feedback, may be indicated by a base station through a DL assignment DCI.
  • the PUCCH resource for transmitting HARQ feedback may be set to semi-static through RRC signaling.
  • a K1 value which is a timing gap value between a PDSCH reception slot and a corresponding HARQ feedback information transmission slot, may be transmitted to a terminal through DL assignment DCI or RRC signaling.
  • PUCCH resources for CQI / CSI reporting may also be allocated through RRC signaling and DL assignment DCI.
  • the LBT (DL LBT) for downlink transmission is successful at the base station, and it is indicated by hatching that the downlink transmission is performed through the unlicensed band at a later point in time.
  • the downlink transmission may be a transmission of a downlink channel or a signal indicating uplink transmission.
  • a PUCCH for PDSCH transmission and a corresponding HARQ feedback, a DCI requiring CQI / CSI reporting, a PUCCH for reporting accordingly, or a DCI for transmitting scheduling information for the PUSCH and a corresponding PUSCH, etc. Can be.
  • a timing gap occurs between downlink transmission and uplink transmission.
  • the UE when a downlink signal or channel according to downlink transmission indicates PUCCH transmission in an NR-U cell that is an unlicensed band, the UE basically transmits the corresponding PUCCH according to regulation of an unlicensed spectrum.
  • LBT should be preferentially performed and PUCCH transmission at the indicated time is determined according to the LBT result. If, as a result of the LBT, the corresponding radio channel is occupied by another node, that is, when an LBT failure occurs, the corresponding UE may not perform PUCCH transmission at the indicated time.
  • a DLSCH allocation slot including a PUCCH resource allocation information and PUCCH transmission indication information or a PDSCH transmission slot according to a corresponding DL assignment DCI and a corresponding PUCCH transmission slot are corresponding base stations.
  • the UE belongs to the Channel Occupancy Time (COT) of the UE, PUCCH transmission may be possible in the corresponding UE without performing LBT. This is because the base station is already occupied for downlink transmission to the corresponding UE in the unlicensed band and is not occupied by another node. That is, depending on the setting of the COT and the K1 value of the base station, HARQ feedback transmission through the PUCCH may be possible in the corresponding terminal without LBT.
  • COT Channel Occupancy Time
  • CSI / CQI reporting through PUCCH is indicated through DL assignment DCI
  • a slot in which DL assignment DCI is transmitted and CQI / CSI reporting accordingly If a timing gap value between slots in which PUCCH transmission including reporting information is formed is M, CSI / CQI reporting through PUCCH without LBT in the corresponding UE according to the corresponding timing gap value M and the COT of the base station. This may be possible.
  • K2 value which is timing gap information between UL grant DCI transmitted by a base station and a slot in which PUSCH transmission is performed, is also used for PUSCH transmission of a UE. May be set to semi-static through RRC signaling or dynamically through UL grant DCI (UL grant DCI). Even in this case, when an uplink grant DCI (UL grant DCI) transmission slot including the corresponding PUSCH transmission resource allocation information and a corresponding PUSCH transmission slot belong to within a COT (Channel Occupancy Time) of the base station, the corresponding UE does not perform the LBT. Transmission may be possible.
  • COT Channel Occupancy Time
  • the base station may instruct the terminal by setting an LBT scheme for performing LBT when PUCCH or PUSHC transmission from any terminal.
  • the LBT scheme may be divided into a plurality of schemes by at least one of whether to perform LBT, random back off, and random back off time.
  • a method of performing LBT is referred to as an 'LBT method', but is not limited thereto.
  • the manner of performing the LBT may be variously referred to as the LBT category.
  • the LBT method may include a first LBT method that does not perform LBT, a second LBT method that performs LBT but does not perform random backoff, and performs random backoff with the LBT, but the random backoff time interval is fixed.
  • the third LBT scheme and the random backoff may be performed with the LBT, but the random backoff time interval may include a fourth LBT scheme and the like.
  • the BS may be defined to directly indicate whether to perform LBT for uplink transmission of the UE through L1 control signaling.
  • it may be defined to include a corresponding LBT indication information region in a downlink allocation DCI format for transmitting PDSCH scheduling control information.
  • the LBT indication information may be indication information of 1 bit.
  • PUCCH transmission of a terminal corresponding to a corresponding DL assignment DCI format (DL assignment DCI format) is determined according to the value (0, 1) of the corresponding bit, whether or not to perform LBT on the corresponding terminal may be determined. have. That is, in this case, the value of the corresponding bit may mean that the first LBT scheme and the remaining LBT schemes are distinguished from the aforementioned LBT schemes.
  • the corresponding LBT indication information may be two bits of indication information.
  • the LBT scheme for performing the LBT in the terminal can be defined to be determined. That is, in this case, the value of the corresponding bit may mean that the first LBT scheme and the fourth LBT scheme are distinguished from the aforementioned LBT scheme.
  • the PUCCH transmission of the UE corresponding to the aforementioned DL assignment DCI format may transmit HARQ feedback information of the UE according to the PDSCH reception of the UE based on the corresponding DL assignment DCI format. It may be a PUCCH transmission for.
  • CQI / CSI reporting is triggered by a corresponding DL assignment DCI format.
  • It may be a PUCCH transmission for CQI / CSI reporting accordingly.
  • a corresponding LBT indication information region in an uplink grant DCI format (UL grant DCI format) for transmitting PUSCH scheduling control information.
  • the LBT indication information may be indication information of 1 bit.
  • the value of the corresponding bit (0, 1), when the PUSCH transmission of the terminal corresponding to the UL grant DCI format (UL grant DCI format), it can be defined to determine whether to perform the LBT in the terminal. have. That is, in this case, the value of the corresponding bit may mean distinguishing the first scheme from the remaining schemes among the aforementioned LBT schemes.
  • the corresponding LBT indication information may be two bits of indication information.
  • the LBT scheme for performing the LBT in the UE can be defined to be determined. That is, in this case, the value of the corresponding bit may mean that the first to fourth schemes are distinguished from the aforementioned LBT schemes.
  • the PUSCH transmission of the terminal corresponding to the UL grant DCI format may be a PUSCH transmission for uplink data transmission of the terminal or a PUSCH transmission for UCI transmission of the terminal.
  • whether to perform the corresponding LBT is shown in FIG. 12, downlink transmission indicated by the corresponding uplink transmission and corresponding uplink It may be defined to be determined by a timing gap value between transmissions.
  • the UE when a timing gap value is smaller than a certain threshold value, respectively, the UE may be defined to enable the indicated PUCCH or PUSCH transmission without LBT.
  • the UE when a timing gap value is larger than a corresponding threshold, the UE may define that the corresponding PUCCH or PUSCH transmission is possible after performing LBT.
  • the threshold is determined by the COT value in the corresponding NR-U, or accordingly, cell-specific RRC signaling or UE-specific RRC signaling by the base station. It may be configured through specific RRC signaling or may be configured through cell-specific RRC signaling or UE-specific RRC signaling by the base station regardless of the COT.
  • the threshold is defined as a single threshold for each uplink transmission case or as a different threshold for cell-specific RRC signaling by the base station. It may be configured through specific RRC signaling or UE-specific RRC signaling.
  • the LBT scheme to be performed to transmit the uplink signal in the unlicensed band can be determined, and the uplink signal can be transmitted in the unlicensed band according to the determined LBT scheme.
  • the present disclosure proposes a HARQ ACK / NACK feedback method of a terminal for an NR-U cell in consideration of a case where an unlicensed band may be occupied by another node at an indicated time point as in the above-described example.
  • the present disclosure may be substantially applied to a method of transmitting an uplink control channel (PUCCH) including other types of UCI, such as SR or CSI / CQI feedback, in addition to HARQ ACK feedback.
  • PUCCH uplink control channel
  • Embodiment 1 Directly indicates HARQ ACK / NACK feedback slot through separate downlink control information (Separate DCI)
  • PDSCH downlink data channel
  • DCI format link control information format
  • a K1 value which is a resource allocation and feedback timing for an uplink control channel (PUCCH) for HARQ feedback
  • PUCCH uplink control channel
  • the corresponding K1 value is set through RRC signaling.
  • the base station checks the accessibility (accessibility) for the corresponding radio channel through the LBT, and informs the terminal when the access (access) is possible, thereby triggering the PUCCH transmission of the terminal (triggering) Can be defined.
  • the PUCCH transmission triggering information may be transmitted through the PDCCH.
  • the PUCCH transmission triggering information is UE-group common DCI format (UE-group common DCI format) for the corresponding PUCCH transmission triggering is defined UE-group common PDCCH (ie, UE-group common PDCCH) , Via CSS).
  • the PUCCH transmission triggering information is defined in a UE-specific DCI format (UE-specific DCI format) for the corresponding PUCCH transmission triggering to be transmitted through the UE-specific PDCCH (ie, USS) Can be.
  • the PUCCH triggering DCI format may be defined to include a PUCCH resource allocation information and a K3 value that is PUCCH transmission timing information.
  • the K3 value may be defined as a timing gap between a reception slot of a corresponding PUCCH triggering DCI format and a corresponding PUCCH transmission slot of a terminal.
  • the PUCCH triggering DCI format includes only PUCCH resource allocation information, and the K3 value is UE-specific / cell-specific higher layer signaling. signaling) may be set by the base station or defined as any fixed value.
  • the PUCCH triggering DCI format includes only a K3 value, and the PUCCH resource allocation information to be transmitted by each UE is included in a DL assignment DCI format. Can be defined to be.
  • a PUCCH resource for HARQ feedback of the UE for PDSCH is allocated through a separate PUCCH triggering DCI format, which is distinguished from a DL assignment DCI format, a configuration or indication thereof Information may be signaled (explicitly or implicitly) from the base station to the corresponding terminal (explicitly or implicitly).
  • whether PUCCH resources are allocated through the PUCCH triggering DCI format is determined by a base station through UE-specific or cell-specific RRC signaling. Can be.
  • the UE receives PUCCH resource allocation information through a PUCCH resource indicator included in a DL assignment DCI format, or is separate. It may be determined whether to receive the PUCCH resource allocation information through the reception of the PUCCH triggering DCI format for PUCCH resource allocation.
  • the configuration information may be indicated through a DCI format 1_0 or DCI format 1_1, which is a DL assignment DCI format including PDSCH resource allocation information. That is, when the corresponding PDSCH resource is allocated, whether PUCCH resource allocation information is made through a PUCCH resource indicator of a DL assignment DCI format or a separate DCI format that is subsequently transmitted, PUCCH Information on whether to perform the PUCCH triggering DCI format may be signaled through a corresponding DL assignment DCI format, in this case, as shown in FIG. 17.
  • the DL assignment DCI format may include a separate information area for indicating this, for example, a PUCCH allocation flag information area, etc.
  • a DL assignment DCI format. May be defined to indicate an existing information area, for example, by using a PUCCH resource indicator information area. The location of each information in the DCI formats is arbitrarily shown and is not limited to that location.
  • the information may be implicitly signaled.
  • the corresponding information may be indicated according to the K1 value indicated through the corresponding DL assignment DCI format. That is, if the K1 value is greater than or equal to a certain threshold, PUCCH resource allocation may be indicated through a separate DCI format.
  • PUCCH resource allocation may be performed through a PUCCH resource indicator of a corresponding DL assignment DCI format.
  • the specific threshold may be fixed to a specific value or may be set by cell base station through cell-sepcific / UE-specific RRC signaling.
  • the UE may define to transmit all pending HARQ ACK feedback information through the corresponding PUCCH accordingly.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band that can transmit HARQ feedback information for reception of a downlink data channel in an unlicensed band can be provided.
  • any UE may receive a PUCCH triggering DCI format, if any other UCI such as CQI / CSI reporting or SR other than HARQ feedback exists, all pending UCIs (pending) UCI) may be defined to be transmitted through the PUCCH.
  • a maximum payload size or a maximum codebook size that can be transmitted through an arbitrary PUCCH is set by the base station so that UE-specific / cell-specific higher layer It may be transmitted to the terminal through higher layer signaling, MAC CE signaling, or L1 control signaling.
  • the UE transmits the PUCCH according to the reception of the PUCCH triggering DCI format when the payload size of the pending UCI exceeds the maximum payload size, the UE transmits a specific UCI. Can be defined to drop.
  • a priority rule for UCI dropping may be defined.
  • priority may be defined for each UCI type.
  • priority may be defined in the order of SR> HARQ ACK feedback> CQI / CSI reporting.
  • this is merely an example and the present invention is not limited thereto. All cases of defining priorities for each other UCI type may be included in the scope of the present disclosure.
  • the dropping is performed in order of the most recent UCI, or in the order of the oldest UCI. can do.
  • an uplink control channel including various uplink control information in an unlicensed band.
  • the HARQ feedback window may be set to a continuous HARQ feedback window.
  • a plurality of PUCCH resource sets for transmitting HARQ feedback for one PDSCH reception may be defined.
  • Each PUCCH resource constituting the plurality of PUCCH resource sets corresponding to one PDSCH reception is referred to as a PUCCH opportunity in the present disclosure.
  • this is merely an example and is not limited to the term.
  • a plurality of PUCCH opportunities for HARQ feedback of a UE according to one PDSCH reception may be configured in a time domain.
  • the HARQ feedback window may consist of consecutive slots.
  • the base station may transmit the offset value and the corresponding window size information, which are the start slot of the corresponding HARQ feedback window, to the terminal.
  • the offset value means a K1 value that is a timing gap between the PDSCH reception slot of the UE and the slot where the HARQ feedback window starts.
  • the window size value means an N value that is the number of consecutive slots in which PUCCH opportunities are configured from the start slot of the HARQ feedback window by the K1 value.
  • the K1 and N values may be indicated through separate information areas.
  • the corresponding K1 value is indicated through DL assignment DCI and N value is semi-static through UE-specific or cell-specific higher layer signaling. It can be set to (semi-static).
  • both the K1 value and the N value may be set to semi-static through UE-specific or cell-specific higher layer signaling.
  • both the K1 value and the N value may be dynamically indicated through DL assignment DCI.
  • the K1 value is set to semi-static through UE-specific or cell-specific higher layer signaling
  • the N value is DL allocated DCI (DL). It may be indicated dynamically through an assignment DCI).
  • a table for mapping between the setting value according to the indication information and the actual K1 value or N value accordingly. May be configured through UE-specific or cell-specific RRC signaling. That is, when the K1 value is defined to be indicated through the DL assignment DCI, the actual K1 corresponding to each setting value of the K1 indication information region transmitted through the DL assignment DCI format.
  • a mapping table defining values may be configured through UE-specific or cell-specific RRC signaling.
  • the N value is defined to be indicated through DL assignment DCI, the actual value corresponding to the setting value of the corresponding N indication information region transmitted through DL assignment DCI format is applied.
  • a mapping table defining an N value may be configured through UE-specific or cell-specific RRC signaling.
  • one information area for deriving the corresponding N value and the K1 value for example, an HARQ window configuration information area is defined and corresponding N It can be defined to set value and K1 value. That is, the N value and the K1 value may be defined according to the HARQ window configuration setting value.
  • the corresponding HARQ window configuration information is set to semi-static through UE-specific or cell-specific higher layer signaling, or downlink allocation DCI It may be set dynamically through (DL assignment DCI).
  • a mapping table defining a corresponding N value and K1 value for each HARQ window configuration setting value is defined, and based on this, the corresponding HARQ window configuration information is UE-specific or cell-specific higher layer. It may be semi-statically configured through signaling or may be dynamically configured through DL assignment DCI. However, when the corresponding HARQ window configuration information is set dynamically through the DL assignment DCI or DL assignment DCI, the HARQ window configuration indication information region transmitted through the downlink assignment DCI.
  • a mapping table defining actual N values and K1 values corresponding to the set values may be configured by the base station through UE-specific or cell-specific RRC signaling. have.
  • the HARQ feedback window may be set to a discontinuous HARQ feedback window.
  • the HARQ feedback window may be composed of noncontiguous slots. Accordingly, the base station transmits the number of PUCCH opportunities information, which is the start slot of the corresponding HARQ feedback window, that is, period information of the offset value, PUCCH opportunity and window size information, to the terminal.
  • the offset value means a K1 value that is a timing gap between the PDSCH reception slot of the UE and the slot where the HARQ feedback window starts.
  • the window size value means the number of non-contiguous slots in which PUCCH opportunities are configured from the start slot of the HARQ feedback window according to the K1 value, and the N value.
  • the PUCCH opportunity period information means a P value, which is an interval between slots in which each PUCCH opportunity is configured in a corresponding HARQ feedback window.
  • separate information areas for indicating the K1 value, the N value, and the P value may be defined.
  • a specific method for transmitting the corresponding K1 value, the N value, and the P value to the terminal includes transmitting the aforementioned K1 value and the N value to the terminal.
  • the content described in the example of defining each information area for transmission may be applied in the same manner, and redundant descriptions will be omitted.
  • an information area for deriving the corresponding K1 value, the N value, and the P value for example, an HARQ window configuration information area is defined. And it can be defined to set the corresponding K1 value, N value, and P value.
  • a specific HARQ window configuration information area transmission method and a method of setting the K1 value, the N value, and the P value according to this method define a HARQ window configuration information area in order to set the above-described N value and K1 value, and through this, the corresponding N value.
  • the methods described in the example of defining to set the value and K1 may be applied in the same manner, and redundant descriptions thereof will be omitted.
  • one information area for indicating the K1 value is defined, and another information area for setting the N value and the P value is defined, and the corresponding K1 value, the N value, and the P value are transmitted to the terminal.
  • an offset indication information area for transmitting an offset K1 value is defined, and another information area for setting an N value and a P value, for example, an HARQ window configuration information area is separately defined.
  • N and P values can be defined.
  • a specific method of transmitting the offset indication information region for indicating the corresponding K1 value and the HARQ window configuration information region for setting the N value and the P value to the terminal includes the aforementioned two methods, K1 value and N value to the terminal.
  • each PUCCH opportunity of the corresponding HARQ feedback window may be configured with the same PUCCH resource. That is, PUCCH resources corresponding to each PUCCH opportunity may be defined to be allocated to the same PUCCH format and the same frequency resource.
  • the PUCCH resources constituting the PUCCH opportunity constituting the corresponding HARQ feedback window may be assigned DL downlink DCI (DL assignment DCI) according to the PUCCH resource mapping rule defined by the TS 38.213 document. It can be defined to share the PUCCH resources by the PUCCH resource allocation information indicated through.
  • the PUCCH resources constituting each PUCCH opportunity may be PUCCH resources configured through different sub-bands or bandwidth parts (BWPs). That is, frequency hopping may be applied to PUCCH resources constituting each PUCCH opportunity of the corresponding HARQ feedback window, and frequency hopping may be performed in subband units or bandwidth parts. (BWP) units.
  • BWP bandwidth parts
  • the frequency hopping is activated or deactivated by the base station.
  • the activation / deisabling indication information may be set by the base station to allow UE-specific / cell-specific RRC signaling or DL assignment DCI. Or it may be transmitted to the terminal through the MAC CE signaling (signaling).
  • a sub-band or bandwidth part (BWP) for applying frequency hopping to PUCCH opportunity of the corresponding HARQ feedback window may include a UL (or DL) bandwidth part configured for the UE. It may be set separately from the BWP) and transmitted to the terminal through UE-specific / cell-specific RRC signaling.
  • a sub-band or bandwidth part (BWP) for applying frequency hopping to PUCCH opportunity in the corresponding HARQ feedback window may include a UL (or DL) bandwidth part (BWP) configured for the UE. ) Can be defined to follow.
  • the PUCCH resources constituting each PUCCH opportunity are each subband that is a unit of hopping.
  • BWP bandwidth part
  • the PUCCH resource allocation can be defined according to the ARI indicated through.
  • the sub-band or bandwidth part (BWP) hopping pattern is a constant pattern according to the number of sub-bands or bandwidth parts (BWP) set for the corresponding UE. Is defined, or is semi-statically configured by the base station through UE-specific / cell-specific higher layer signaling, or the downlink allocation DCI format ( It may be indicated dynamically through a DL assignment DCI format. However, when a corresponding hopping pattern is dynamically indicated through a DL assignment DCI format, a subband for each setting value of the corresponding hopping pattern indication information region may be used.
  • a band or bandwidth part hopping pattern table may be configured by a base station and configured through UE-specific / cell-specific higher layer signaling.
  • a hopping size for a corresponding PUCCH opportunity hopping is directly set by a base station so that UE-specific / cell-specific RRC signaling or MAC CE signaling is performed. (signalling) or DL assignment DCI (DL assignment DCI) may be defined to be transmitted directly to the terminal.
  • the hopping size may be set in units of PRBs.
  • frequency hopping may be applied to the PUCCH resources constituting each PUCCH opportunity according to the set hopping size.
  • the frequency hopping may be configured. It may be defined within the bandwidth part (BWP) or within the system bandwidth of the carrier.
  • the frequency hopping may be applied in units of one PUCCH opportunity, that is, every PUCCH opportunity, or may be applied in units of a group of PUCCH opportunities. That is, if any HARQ feedback window consists of N PUCCH opportunities, frequency hopping is applied for each PUCCH opportunity, or successive M (N ⁇ N) PUCCH opportunities The above frequency hopping may be applied in units of opportunities.
  • the corresponding M value is also set by the base station through UE-specific / cell-specific RRC signaling or MAC CE signaling or DL assignment DCI. It may be defined to be transmitted to the terminal.
  • the UEs may be defined to basically perform LBT for PUCCH transmission at each PUCCH opportunity.
  • the terminal is defined to transmit the PUCCH through the corresponding PUCCH opportunity without LBT. can do.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band that can transmit HARQ feedback information for reception of a downlink data channel in an unlicensed band can be provided.
  • FIG. 20 is a diagram illustrating a configuration of a user terminal 2000 according to another embodiment.
  • the user terminal 2000 includes a controller 2010, a transmitter 2020, and a receiver 2030.
  • the controller 2010 controls the overall operation of the user terminal 2000 according to the method for transmitting HARQ feedback information in the unlicensed band required to perform the above-described present disclosure.
  • the transmitter 2020 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the receiver 2030 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the receiver 2030 may receive downlink control information including resource allocation information for a downlink data channel (PDSCH) in an unlicensed band.
  • PDSCH downlink data channel
  • the receiver 2030 may receive a downlink data channel from the base station based on resource allocation information included in the downlink control information.
  • the transmitter 2020 may transmit HARQ ACK / NACK feedback information to the base station as to whether to receive the downlink data channel.
  • the receiver 2030 may receive HARQ timing indication information for transmitting HARQ feedback information in the unlicensed band.
  • the receiver 2030 may receive a resource allocation and feedback timing K1 value for an uplink control channel (PUCCH) for HARQ feedback through a DL assignment DCI.
  • the feedback timing K1 value may be set through RRC signaling.
  • the transmitter 2020 may transmit HARQ feedback information based on whether a downlink data channel is received based on the received resource allocation and K1 value of feedback timing.
  • the transmitter 2020 may be difficult to transmit the PUCCH at the indicated timing. Therefore, according to an example, when the base station performs an access to the unlicensed band by performing List Before Talk (LBT), the terminal may be notified of this to trigger the PUCCH transmission of the transmitter 2020.
  • LBT List Before Talk
  • the PUCCH transmission triggering information may be defined through a UE-group common DCI format (UE-group common DCI format) for the corresponding PUCCH transmission triggering and transmitted through the UE-group common PDCCH.
  • the PUCCH transmission triggering information may be defined through a UE-specific DCI format (UE-specific DCI format) for the corresponding PUCCH transmission triggering may be transmitted through the UE-specific PDCCH (UE-specific PDCCH).
  • the PUCCH triggering DCI format set separately may include resource allocation information for the PUCCH and a K3 value that is PUCCH transmission timing information.
  • the K3 value may be set as a timing gap between a reception slot of a corresponding PUCCH triggering DCI format and a PUCCH transmission slot of a terminal accordingly.
  • the PUCCH triggering DCI format includes only PUCCH resource allocation information
  • the K3 value is set by the base station through UE-specific / cell-specific higher layer signaling. Can be.
  • the K3 value can be set to any fixed value.
  • the PUCCH triggering DCI format may be set to include only a K3 value.
  • the PUCCH resource allocation information to be transmitted by each terminal may be configured to be included in a DL assignment DCI format.
  • a PUCCH resource for HARQ feedback of a UE for a PDSCH is allocated through a separate PUCCH triggering DCI format, which is distinguished from a downlink allocation DCI format, configuration or indication information for this is explicitly transmitted from a base station to a corresponding UE. Or may be signaled implicitly.
  • whether PUCCH resources are allocated through the PUCCH triggering DCI format may be configured by a base station through UE-specific or cell-specific RRC signaling.
  • the controller 2010 allocates PUCCH resources through a PUCCH resource indicator included in a downlink allocation DCI format. It may be determined whether to receive the information, or whether to receive the PUCCH resource allocation information through the PUCCH triggering DCI format reception for separate PUCCH resource allocation.
  • the configuration information may be indicated through DCI format 1_0 or DCI format 1_1, which is a downlink allocation DCI format including PDSCH resource allocation information. That is, when allocating resources for the PDSCH, the downlink allocation DCI format may include delay indication information indicating whether to delay the transmission of HARQ feedback information. This means that information on whether PUCCH resource allocation information is made through a PUCCH resource indicator of a downlink allocation DCI format or is delayed through a separate PUCCH triggering DCI format transmitted subsequently is signaled through the corresponding downlink allocation DCI format. Can mean being.
  • the corresponding DL allocation DCI format may include a separate information area for indicating delay indication information, for example, a PUCCH allocation flag information area.
  • the downlink allocation DCI format may be configured to indicate this by using an existing information area, for example, a PUCCH resource indicator information area.
  • delay indication information may be indicated according to K1 value indicated through a corresponding downlink allocation DCI format. That is, if the K1 value is greater than or equal to a certain threshold, the PUCCH resource allocation may be indicated through a separate PUCCH triggering DCI format. Alternatively, when the K1 value is smaller than the corresponding threshold value, PUCCH resource allocation may be performed through the PUCCH resource indicator of the corresponding DL allocation DCI format.
  • the specific threshold may be fixed to a specific value or may be set by cell base station through cell-sepcific / UE-specific RRC signaling.
  • the transmitter 2020 may transmit HARQ feedback information in the unlicensed band according to the HARQ timing indication information.
  • the transmitter 2020 may transmit HARQ feedback information according to the received resource allocation information.
  • the controller 2010 allocates resource allocation information for transmitting HARQ feedback information from the base station. And delaying transmission of HARQ feedback information until receiving timing information.
  • the receiver 2030 may receive the PUCCH triggering DCI format after the downlink allocation DCI format is received.
  • the transmitter 2020 may transmit HARQ feedback information according to resource allocation information and timing information for the uplink control channel included in the PUCCH triggering DCI format. In this case, the transmitter 2020 may transmit all HARQ ACK feedback information pending when the PUCCH triggering DCI format is received through the corresponding PUCCH.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band for transmitting HARQ feedback information for reception of a downlink data channel in an unlicensed band can be provided.
  • the transmitter 2020 may transmit all UCIs that are pending. Can be transmitted through the corresponding PUCCH.
  • a maximum payload size or a maximum codebook size that can be transmitted through any PUCCH may be set by the base station.
  • the configured maximum payload size or maximum codebook size may be UE-specific / cell-specific higher layer signaling, MAC CE signaling, or L1 control signaling. ) May be transmitted to the terminal.
  • the controller 2010 drops a specific UCI when the payload size of the pending UCI exceeds the maximum payload size when the PUCCH is transmitted according to the PUCCH triggering DCI format reception. can be set to dropping.
  • a priority rule for UCI dropping may be set.
  • priority may be set for each UCI type.
  • priority may be defined in the order of SR> HARQ ACK feedback> CQI / CSI reporting.
  • this is merely an example and the present invention is not limited thereto. All cases of defining priorities for each other UCI type may be included in the scope of the present disclosure.
  • the dropping is performed in order of the most recent UCI, or in the order of the oldest UCI. can do.
  • an uplink control channel including various uplink control information in an unlicensed band.
  • 21 is a diagram illustrating a configuration of a base station 2100 according to another embodiment.
  • a base station 2100 includes a controller 2110, a transmitter 2120, and a receiver 2130.
  • the controller 2110 controls the overall operation of the base station 2100 according to the method for transmitting HARQ feedback information in the unlicensed band required to perform the above-described present disclosure.
  • the transmitter 2120 and the receiver 2130 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present disclosure with the terminal.
  • the transmitter 2120 may transmit downlink control information including resource allocation information for a downlink data channel (PDSCH) to the terminal in the unlicensed band.
  • PDSCH downlink data channel
  • the transmitter 2120 may transmit a downlink data channel to the terminal based on resource allocation information included in the downlink control information.
  • the receiver 2130 may receive HARQ ACK / NACK feedback information from the terminal as to whether to receive the downlink data channel.
  • the transmitter 2120 may transmit HARQ timing indication information for receiving HARQ feedback information in the unlicensed band.
  • the transmitter 2120 may transmit a resource allocation and feedback timing K1 value for an uplink control channel (PUCCH) for HARQ feedback through a DL assignment DCI.
  • the feedback timing K1 value may be set through RRC signaling.
  • the receiver 2130 may receive HARQ feedback information according to whether a downlink data channel is received based on the transmitted resource allocation and the feedback timing K1 value.
  • the UE when using the unlicensed band, when the corresponding unlicensed band is occupied by another node in the slot according to the K1 value indicated by the base station, it may be difficult for the terminal to transmit the PUCCH at the indicated timing. Therefore, according to an example, when the base station performs the LBT (Listen Before Talk) to access the unlicensed band, the UE may be notified of this, thereby triggering the PUCCH transmission of the UE.
  • LBT Listen Before Talk
  • the PUCCH transmission triggering information may be defined through a UE-group common DCI format (UE-group common DCI format) for the corresponding PUCCH transmission triggering and transmitted through the UE-group common PDCCH.
  • the PUCCH transmission triggering information may be defined through a UE-specific DCI format (UE-specific DCI format) for the corresponding PUCCH transmission triggering may be transmitted through the UE-specific PDCCH (UE-specific PDCCH).
  • the PUCCH triggering DCI format set separately may include resource allocation information for the PUCCH and a K3 value that is PUCCH transmission timing information.
  • the K3 value may be set as a timing gap between a reception slot of a corresponding PUCCH triggering DCI format and a PUCCH transmission slot of a terminal accordingly.
  • the PUCCH triggering DCI format includes only PUCCH resource allocation information
  • the K3 value is set by the base station through UE-specific / cell-specific higher layer signaling. Can be.
  • the K3 value can be set to any fixed value.
  • the PUCCH triggering DCI format may be set to include only a K3 value.
  • the PUCCH resource allocation information to be transmitted by each terminal may be configured to be included in a DL assignment DCI format.
  • a PUCCH resource for HARQ feedback of a UE for a PDSCH is allocated through a separate PUCCH triggering DCI format, which is distinguished from a downlink allocation DCI format, configuration or indication information for this is explicitly transmitted from a base station to a corresponding UE. Or may be signaled implicitly.
  • whether PUCCH resources are allocated through the PUCCH triggering DCI format may be configured by a base station through UE-specific or cell-specific RRC signaling.
  • the controller 2010 allocates PUCCH resources through a PUCCH resource indicator included in a downlink allocation DCI format. It may be determined whether to receive the information, or whether to receive the PUCCH resource allocation information through the PUCCH triggering DCI format reception for separate PUCCH resource allocation.
  • the configuration information may be indicated through DCI format 1_0 or DCI format 1_1, which is a downlink allocation DCI format including PDSCH resource allocation information. That is, when allocating resources for the PDSCH, the downlink allocation DCI format may include delay indication information indicating whether to delay the transmission of HARQ feedback information. This means that information on whether PUCCH resource allocation information is made through a PUCCH resource indicator of a downlink allocation DCI format or is delayed through a separate PUCCH triggering DCI format transmitted subsequently is signaled through the corresponding downlink allocation DCI format. Can mean being.
  • the corresponding DL allocation DCI format may include a separate information area for indicating delay indication information, for example, a PUCCH allocation flag information area.
  • the downlink allocation DCI format may be configured to indicate this by using an existing information area, for example, a PUCCH resource indicator information area.
  • delay indication information may be indicated according to K1 value indicated through a corresponding downlink allocation DCI format. That is, if the K1 value is greater than or equal to a certain threshold, the PUCCH resource allocation may be indicated through a separate PUCCH triggering DCI format. Alternatively, when the K1 value is smaller than the corresponding threshold value, PUCCH resource allocation may be performed through the PUCCH resource indicator of the corresponding DL allocation DCI format.
  • the specific threshold may be fixed to a specific value or may be set by cell base station through cell-sepcific / UE-specific RRC signaling.
  • the receiver 2130 may receive HARQ feedback information in the unlicensed band according to the HARQ timing indication information.
  • the receiver 2130 may receive HARQ feedback information according to the transmitted resource allocation information.
  • the UE allocates resource allocation information for transmission of HARQ feedback information from the transmitter 2120. And delaying transmission of HARQ feedback information until receiving timing information.
  • the transmitter 2120 may transmit the PUCCH triggering DCI format.
  • the receiver 2130 may receive HARQ feedback information according to resource allocation information and timing information for the uplink control channel included in the PUCCH triggering DCI format. In this case, the receiver 2130 may receive all HARQ ACK feedback information pending when the PUCCH triggering DCI format is received through the corresponding PUCCH.
  • a method and apparatus for transmitting HARQ feedback information in an unlicensed band for transmitting HARQ feedback information for reception of a downlink data channel in an unlicensed band 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.
  • 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, an execution thread, 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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Abstract

Les modes de réalisation de la présente invention concernent un procédé et un dispositif de transmission d'informations de rétroaction HARQ dans une bande sans licence. Un mode de réalisation de l'invention concerne un procédé d'un terminal transmettant des informations de rétroaction HARQ dans une bande sans licence, le procédé consistant : à recevoir des informations de commande de liaison descendante comprenant des informations d'attribution de ressources d'un canal de données de liaison descendante (PDSCH) dans une bande sans licence ; à recevoir des informations d'indication de synchronisation HARQ afin de transmettre des informations de rétroaction HARQ dans la bande sans licence ; et à transmettre les informations de rétroaction HARQ dans la bande sans licence en fonction des informations d'indication de synchronisation HARQ.
PCT/KR2019/005760 2018-05-17 2019-05-14 Procédé et dispositif de transmission d'informations de rétroaction harq dans une bande sans licence WO2019221475A1 (fr)

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CN201980032985.7A CN112136286B (zh) 2018-05-17 2019-05-14 在非许可频段中发送harq反馈信息的方法和设备
US17/055,810 US11949513B2 (en) 2018-05-17 2019-05-14 Method and device for transmitting HARQ feedback information in unlicensed band

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KR20180056288 2018-05-17
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KR10-2018-0150160 2018-11-28
KR1020180150160A KR20190132183A (ko) 2018-05-17 2018-11-28 비면허 대역의 차세대 무선망을 위한 상향 링크 제어 채널 전송 방법 및 그 장치
KR1020190055567A KR102326031B1 (ko) 2018-05-17 2019-05-13 비면허 대역에서 harq 피드백 정보를 전송하는 방법 및 장치
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