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WO2020029696A1 - 半静态harq-ack码本的生成方法、用户终端、可读存储介质 - Google Patents

半静态harq-ack码本的生成方法、用户终端、可读存储介质 Download PDF

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Publication number
WO2020029696A1
WO2020029696A1 PCT/CN2019/092978 CN2019092978W WO2020029696A1 WO 2020029696 A1 WO2020029696 A1 WO 2020029696A1 CN 2019092978 W CN2019092978 W CN 2019092978W WO 2020029696 A1 WO2020029696 A1 WO 2020029696A1
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WO
WIPO (PCT)
Prior art keywords
harq
ack
pdsch
base station
semi
Prior art date
Application number
PCT/CN2019/092978
Other languages
English (en)
French (fr)
Inventor
张飒
Original Assignee
北京展讯高科通信技术有限公司
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Filing date
Publication date
Application filed by 北京展讯高科通信技术有限公司 filed Critical 北京展讯高科通信技术有限公司
Priority to EP19847019.7A priority Critical patent/EP3836682A4/en
Priority to US17/266,837 priority patent/US20210359796A1/en
Publication of WO2020029696A1 publication Critical patent/WO2020029696A1/zh

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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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • 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
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals

Definitions

  • Embodiments of the present invention relate to the field of wireless communications, and in particular, to a method for generating a semi-static HARQ-ACK codebook, a user terminal, and a readable storage medium.
  • Hybrid Automatic Repeat Request is a technology that combines Forward Error Correction (FEC) and Automatic Repeat Request (ARQ) methods.
  • FEC adds redundant information to enable the receiving end to correct some errors, thereby reducing the number of retransmissions.
  • the receiver will request the sender to resend data through the ARQ mechanism.
  • the receiving end uses an error detection code, usually a cyclic redundancy check (Cyclic Redundancy Check, CRC), to detect whether the received data packet is in error. If there is no error, the receiver will send a positive acknowledgement (ACK) to the sender. After receiving the ACK, the sender will then send the next data packet. If an error occurs, the receiver will discard the data packet and send a negative acknowledgement (NACK) to the sender. After receiving the NACK, the sender will resend the same data.
  • CRC Cyclic Redundancy Check
  • the new air interface supports multiple monitoring moments in a time slot, and each monitoring time can schedule a physical downlink shared channel (PDSCH), and multiple PDSCHs can be scheduled in a time slot.
  • PDSCH physical downlink shared channel
  • NR supports time domain resource allocation.
  • each PDSCH can be 2, 4, or 7 OFDM symbols.
  • the semi-static HARQ-ACK codebook needs to consider all possible cases (that is, the worst case) to determine the number of HARQ-ACK bits.
  • the situation of the semi-static uplink and downlink configuration of the cell is considered, and the situation that the downlink scheduling conflicts with the semi-static uplink and downlink configuration of the cell is excluded to reduce the size of the semi-static codebook.
  • the UE does not report the ability to support receiving multiple PDSCHs in one time slot, it will be considered that the UE will only receive one PDSCH in one time slot, otherwise, the UE determines that the maximum possible reception of each time slot is based on the time domain resource configuration. The resulting PDSCH thus determines the semi-static HARQ-ACK codebook length.
  • the user terminal generates a corresponding semi-static HARQ-ACK codebook according to the feedback time (k1) of the HARQ-ACK issued by the base station and feeds it back to the base station.
  • k1 may indicate a flexible time instead of a certain time, which makes it difficult for a user terminal to generate a corresponding semi-static HARQ-ACK codebook and feedback based on the value of k1.
  • the embodiment of the present invention solves the technical problem that the semi-static HARQ-ACK codebook cannot support the flexible indication of the HARQ-ACK feedback time.
  • an embodiment of the present invention provides a method for generating a semi-static HARQ-ACK codebook, which includes: receiving a PDSCH issued by a base station and a feedback time of the HARQ-ACK, and the PDSCH issued by the base station is the Sent by the base station after detecting the success of the LBT; according to the PDSCH issued by the base station and the feedback time of the HARQ-ACK, a semi-static HARQ-ACK codebook is generated in the current channel occupation time; the semi-static HARQ-ACK
  • the codebook includes a first subcodebook and a second subcodebook, wherein: the first subcodebook is used to feedback the last X times of the previous channel occupation time in the HARQ-ACK feedback time.
  • the HARQ-ACK corresponding to the PDSCH of the slot; the feedback time of the second subcodebook for feedback of the HARQ-ACK is the HARQ-ACK corresponding to the PDSCH of the indicated time slot in the current channel occupation time.
  • the generating a semi-static HARQ-ACK codebook includes: when receiving downlink control information issued by the base station, it is learned that the HARQ-ACK corresponding to the PDSCH of the last X timeslots is in other times During the gap feedback, the HARQ-ACK corresponding to the PDSCH fed back in other time slots is set to NACK in the first subcodebook.
  • the generating a semi-static HARQ-ACK codebook includes: in the second subcodebook, when it is detected that PDSCH processing of a time slot in a feedback time for the HARQ-ACK cannot be completed, The HARQ-ACK of the PDSCH corresponding to the time slot that cannot be processed is set to NACK.
  • the method further includes: feeding back the semi-static HARQ-ACK codebook to the base station.
  • the first subcodebook and the second subcodebook are arranged in sequence according to time.
  • the value of X is configured by the base station through high-level signaling.
  • the receiving the HARQ-ACK feedback time issued by the base station includes: receiving downlink control information issued by the base station; and obtaining the HARQ-ACK feedback time from the downlink control information.
  • An embodiment of the present invention further provides a user terminal, including: a receiving unit, configured to receive a PDSCH and a HARQ-ACK feedback time issued by a base station, and the PDSCH issued by the base station is sent after the base station detects that the LBT is successful.
  • a generating unit configured to generate a semi-static HARQ-ACK codebook in the current channel occupation time according to the PDSCH issued by the base station and the HARQ-ACK feedback time; the semi-static HARQ-ACK codebook Including a first subcodebook and a second subcodebook, wherein: the first subcodebook is used for feedback of the HARQ-ACK feedback time in the last X timeslots of the previous channel occupation time indicated The HARQ-ACK corresponding to the PDSCH; the second subcodebook is used to feed back the HARQ-ACK.
  • the feedback time is the HARQ-ACK corresponding to the PDSCH in the indicated time slot in the current channel occupation time.
  • the generating unit is configured to, when receiving the downlink control information delivered by the base station, learns that HARQ-ACK corresponding to the PDSCH of the last X timeslots is fed back in other timeslots, and In the first subcodebook, the HARQ-ACK corresponding to the PDSCH fed back in other time slots is set to NACK.
  • the generating unit is configured to, in the second subcodebook, when it is detected that PDSCH processing of a time slot in the HARQ-ACK feedback time cannot be completed, process the incomplete processing.
  • the HARQ-ACK of the PDSCH corresponding to the time slot is set to NACK.
  • the user terminal further includes: a feedback unit, configured to feedback the semi-static HARQ-ACK codebook to the base station.
  • a feedback unit configured to feedback the semi-static HARQ-ACK codebook to the base station.
  • the first subcodebook and the second subcodebook are arranged in sequence according to time.
  • the value of X is configured by the base station through high-level signaling.
  • the receiving unit is configured to receive downlink control information delivered by a base station; and obtain the feedback time of the HARQ-ACK from the downlink control information.
  • An embodiment of the present invention further provides a computer-readable storage medium having computer instructions stored thereon.
  • the steps of the method for generating a semi-static HARQ-ACK codebook according to any one of the foregoing are performed.
  • An embodiment of the present invention further provides a user terminal, which includes a memory and a processor.
  • the memory stores computer instructions that can be run on the processor, and the processor executes any of the foregoing tasks when the processor runs the computer instructions.
  • the steps of the method for generating a semi-static HARQ-ACK codebook are described in detail below.
  • the user terminal may generate a semi-static HARQ-ACK codebook according to the PDSCH and the HARQ-ACK feedback time issued by the base station.
  • the semi-static HARQ-ACK codebook generated by the user terminal includes a first subcodebook and a second subcodebook.
  • the first subcodebook is used to feedback the HARQ-ACK corresponding to the PDSCH in the last X time slots occupied by the previous channel.
  • the second sub-codebook is used for HARQ-ACK corresponding to the PDSCH of the time slot indicated by the current channel occupation time.
  • FIG. 1 is a flowchart of a method for generating a semi-static HARQ-ACK codebook according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of COT and semi-static HARQ-ACK codebook feedback according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of feedback of another COT and a semi-static HARQ-ACK codebook according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a user terminal according to an embodiment of the present invention.
  • the user terminal generates a corresponding semi-static HARQ-ACK codebook according to the feedback time (k1) of the HARQ-ACK issued by the base station and feeds it back to the base station.
  • k1 may indicate a flexible time instead of a certain time, which makes it difficult for a user terminal to generate a corresponding semi-static HARQ-ACK codebook and feedback based on the value of k1.
  • the user terminal may generate a semi-static HARQ-ACK codebook according to the PDSCH and the HARQ-ACK feedback time issued by the base station.
  • the semi-static HARQ-ACK codebook generated by the user terminal includes a first subcodebook and a second subcodebook.
  • the first subcodebook is used to feedback the HARQ-ACK corresponding to the PDSCH in the last X time slots occupied by the previous channel.
  • the second sub-codebook is used for HARQ-ACK corresponding to the PDSCH of the time slot indicated by the current channel occupation time.
  • An embodiment of the present invention provides a method for generating a semi-static HARQ-ACK codebook. Referring to FIG. 1, detailed description is provided below through specific steps.
  • Step S101 Receive a PDSCH and a HARQ-ACK feedback time issued by a base station.
  • the base station sends a PDSCH to the user terminal after detecting that the Listen Before Talk (LBT) succeeds, and configures the user terminal with a corresponding HARQ-ACK feedback time.
  • LBT Listen Before Talk
  • the base station may configure the user terminal with a corresponding HARQ-ACK feedback time through the DCI, and send the DCI to the user terminal.
  • the user terminal receives the DCI issued by the base station, and obtains the HARQ-ACK feedback time configured by the base station from the DCI.
  • Step S102 Generate a semi-static HARQ-ACK codebook in the current channel occupation time according to the PDSCH and the HARQ-ACK feedback time issued by the base station.
  • the semi-static HARQ-ACK codebook may include a first subcodebook and a second subcodebook, where the first subcodebook is used for the feedback time of the HARQ-ACK feedback.
  • the first subcodebook is used for the feedback time of the HARQ-ACK feedback.
  • the second subcodebook is used to feedback the HARQ-ACK feedback time in the indicated time slot of the current COT HARQ-ACK corresponding to PDSCH.
  • X may be configured by the base station and delivered by the base station to the user terminal through high-level signaling. After receiving the high-level signaling issued by the base station, the user terminal can learn the value of X configured by the base station from it.
  • the HARQ-ACK corresponding to the PDSCH of the last X timeslots is learned from the DCI issued by the base station in other timeslots.
  • the HARQ-ACK corresponding to the PDSCH fed back in other time slots is set to NACK.
  • X 2.
  • the last two slots are slot M-1 and slot M.
  • the base station indicates in the DCI that the HARQ-ACK corresponding to the PDSCH of slot M-1 is fed back at other time slots.
  • slot M-1 The HARQ-ACK corresponding to the PDSCH is set to NACK.
  • the The HARQ-ACK of the PDSCH corresponding to the slot that cannot be processed is set to NACK.
  • slot N is the last slot, and the base station instructs the user terminal to feedback the HARQ-ACK corresponding to the PDSCH of slot N.
  • the user terminal feeds back a physical uplink control channel (Physical Uplink Control Channel, PUCCH) to the base station in slot N.
  • PUCCH Physical Uplink Control Channel
  • the HARQ-ACK of the PDSCH corresponding to slot N is set to NACK.
  • the user terminal may feed back its own processing capability to the base station in advance.
  • the base station can configure a corresponding HARQ-ACK feedback time for the user terminal according to the processing capability sent by the user terminal. If the HARQ-ACK feedback time configured by the base station for the user terminal exceeds the user terminal's own processing capability, when the user terminal generates the second subcodebook, the HARQ- of the PDSCH corresponding to the feedback time of the user terminal's own processing capability will be exceeded.
  • ACK is set to NACK.
  • the first subcodebook and the second subcodebook can be arranged in chronological order, that is, on the time axis, when the base station receives the semi-static HARQ-ACK codebook feedback from the user terminal, it first processes the first Subcodebook, and then process the second subcodebook.
  • the semi-static HARQ-ACK codebooks are arranged in chronological order so that the base station can perform corresponding processing.
  • the user terminal may feedback the generated semi-static HARQ-ACK codebook to the base station.
  • FIG. 2 a schematic diagram of COT and semi-static HARQ-ACK codebook feedback according to an embodiment of the present invention is shown.
  • the base station is set to use a sub-carrier interval (Sub-Carrier Spacing, SCS) of 15 kHz, and the PDSCH is configured with an additional demodulation reference signal (Demodulation Reference Signal, DMRS).
  • SCS Sub-Carrier Spacing
  • DMRS Demodulation Reference Signal
  • the user terminal After the user terminal receives the last OFDM symbol of the PDSCH, it needs 13 OFDM symbol processing time to feed back the uplink HARQ-ACK.
  • COT1 includes four slots, which are slot M-3, slot M-2, slot M-1, and slot M;
  • COT2 includes four slots, which are slot N-3, slot N-2, slot N-1, and slot. N.
  • the base station configures the user terminal to use a semi-static HARQ-ACK codebook to feedback HARQ-ACK information of downlink data (that is, PDSCH) through high-level signaling.
  • the set of k1 is ⁇ 1, 2, 3, 4 ⁇ , and the value of k1 is the feedback time.
  • the user terminal does not report to the base station the ability to receive multiple PDSCHs in one slot, that is, the user terminal can only receive one PDSCH in one slot.
  • the base station When the base station is scheduling, for the PDSCH of slot M-3, slot M-2, slot N-3, and slot N-2, the base station will indicate the determined value of k1 in the DCI.
  • the corresponding k1 value is 3; for slot M-2, the corresponding k1 value is 2; for slot N-3, the corresponding k1 value is 3; for slot N-2, The corresponding k1 value is 2.
  • the DCI only indicates the feedback at the next COT, and does not indicate the determined time. At this time, the base station does not know the start time of the next COT, that is, the base station does not know the next LBT success time, so it cannot determine the value of k1 corresponding to the PDSCH of slot M-1 and slot M.
  • the user terminal feeds back PUCCH to the base station in slot M.
  • slot M the user terminal only processes the PDSCH corresponding to slot M-3 and the PDSCH corresponding to slot M-2. Therefore, for the PUCCH fed back by the user terminal in slot M, the HARQ-ACK of the PDSCH corresponding to slot M-3 and the HARQ-ACK of the PDSCH corresponding to slot M-2 can be fed back to the base station.
  • the user terminal does not complete the processing of the PDSCH of slot M-1 and the PDSCH of slot M when the slot M feeds the PUCCH. Therefore, the PDSCH of slot M-1 HARQ-ACK and HARQ-ACK of PDSCH in slot M are fed back in the next COT (COT2).
  • the base station continues to send PDSCH to the user terminal.
  • the user terminal feeds back PUCCH to the base station in slot N.
  • the user terminal can complete the processing of PDSCH received in slot N-3 and slot N-2. Therefore, when the user terminal feeds back the PUCCH to the base station in slot N, it can feed back the HARQ-ACK of the PDSCH corresponding to slot N-3 and the HARQ-ACK of the PDSCH corresponding to slot N-2 to the base station.
  • the PDSCH of slot N-1 HARQ-ACK and HARQ-ACK of PDSCH in slot N are fed back in the next COT.
  • the length of the first subcodebook is 2 bits, and the length of the second subcodebook is 4 bits.
  • the first bit is used to feed back the HARQ-ACK of the PDSCH corresponding to slot M-1
  • the second bit is used to feed back the HARQ-ACK of the PDSCH corresponding to slot M-1.
  • the first bit is used to feedback the HARQ-ACK of the PDSCH corresponding to slot N-4.
  • the HARQ-ACK of the PDSCH corresponding to slot N-4 is NACK; the second bit is used to Feedback the HARQ-ACK of the PDSCH corresponding to slot N-3; the third bit is used to feedback the HARQ-ACK of PDSCH corresponding to slot N-2; the fourth bit is used to feedback the HARQ-ACK of PDSCH corresponding to slot N-1 In this example, the HARQ-ACK of the PDSCH corresponding to slot N-1 is NACK.
  • the first subcodebook is located in front of the second subcodebook, and the total length of the semi-static HARQ-ACK codebook is 6 bits.
  • codeword 1 and codeword 2 constitute a first sub-codebook
  • codewords 3 to 6 constitute a second sub-codebook
  • FIG. 3 a schematic diagram of another type of COT and semi-static HARQ-ACK codebook feedback according to an embodiment of the present invention is shown.
  • the base station is set to use 15 KHz SCS for the downlink, and the PDSCH is only configured with front-loaded DMRS. After the user terminal receives the last OFDM symbol of the PDSCH, it needs 8 OFDM symbol processing events to feed back the uplink HARQ-ACK.
  • the base station configures the user terminal to use a semi-static HARQ-ACK codebook to feedback HARQ-ACK information of downlink data (that is, PDSCH) through high-level signaling.
  • the set of k1 is ⁇ 1, 2, 3, 4 ⁇ , and the value of k1 is the feedback time.
  • the user terminal does not report to the base station the ability to receive multiple PDSCHs in one slot, that is, the user terminal can only receive one PDSCH in one slot.
  • the base station When the base station is scheduling, for the PDSCH of slot M-3, slot M-2, slot M-1, slot N-3, slot N-2, the base station will indicate the determined value of k1 in the DCI.
  • the corresponding k1 value is 3; for slot M-2, the corresponding k1 value is 2; for slot M-1, the corresponding k1 value is 1; for slot N-3, The corresponding k1 value is 3; for slot N-2, the corresponding k1 value is 2.
  • the DCI only indicates the next COT feedback, and does not indicate the determined time. At this time, the base station does not know the start time of the next COT, that is, the base station does not know the next LBT success time, so it cannot determine the value of k1 corresponding to the PDSCH of slot M.
  • the user terminal feeds back PUCCH to the base station in slot M.
  • slot M the user terminal only completes the processing of PDSCH corresponding to slot M-3, PDSCH corresponding to slot M-2, and PDSCH corresponding to slot M-2. Therefore, for the PUCCH fed back by the user terminal in slot M, the HARQ-ACK of PDSCH corresponding to slot M-3, the HARQ-ACK of PDSCH corresponding to slot M-2, and the HARQ-ACK of PDSCH corresponding to slot M-1 Base station feedback.
  • the HARQ-ACK of the PDSCH of the slot M is fed back in the next COT (COT2).
  • the base station continues to send PDSCH to the user terminal.
  • the user terminal feeds back PUCCH to the base station in slot N.
  • the user terminal can complete the processing of PDSCH received in slot N-3 and slot N-2. Therefore, when the user terminal feeds back the PUCCH to the base station in slot N, it can feed back the HARQ-ACK of the PDSCH corresponding to slot N-3 and the HARQ-ACK of the PDSCH corresponding to slot N-2 to the base station.
  • the length of the first subcodebook is 2 bits, and the length of the second subcodebook is 4 bits.
  • the first bit is used to feed back the HARQ-ACK of the PDSCH corresponding to slot M-1
  • the second bit is used to feed back the HARQ-ACK of the PDSCH corresponding to slot M-1. Since the PDSCH of the slot M-1 is indicated by the DCI in the slot M, the HARQ-ACK corresponding to the PDSCH of the slot M-1 in the first subcodebook is NACK.
  • the first bit is used to feedback the HARQ-ACK of the PDSCH corresponding to slot N-4.
  • the HARQ-ACK of the PDSCH corresponding to slot N-4 is NACK;
  • the second bit is used to Feedback the HARQ-ACK of the PDSCH corresponding to slot N-3;
  • the third bit is used to feedback the HARQ-ACK of PDSCH corresponding to slot N-2;
  • the fourth bit is used to feedback the HARQ-ACK of PDSCH corresponding to slot N-1
  • the HARQ-ACK of the PDSCH corresponding to slot N-1 is NACK.
  • the first subcodebook is located in front of the second subcodebook, and the total length of the semi-static HARQ-ACK codebook is 6 bits.
  • codeword 1 and codeword 2 constitute a first sub-codebook
  • codewords 3 to 6 constitute a second sub-codebook
  • a user terminal 40 which includes a receiving unit 401, a generating unit 402, and a feedback unit 403, where:
  • the receiving unit 401 is configured to receive a PDSCH and a HARQ-ACK feedback time issued by a base station, and the PDSCH issued by the base station is sent after the base station detects that the LBT is successful;
  • a generating unit 402 is configured to generate a semi-static HARQ-ACK codebook in the current channel occupation time according to the PDSCH issued by the base station and the HARQ-ACK feedback time;
  • the semi-static HARQ-ACK codebook includes A first subcodebook and a second subcodebook, wherein: the first subcodebook is used to feed back the PDSCH of the last X time slots of the indicated previous channel occupation time in the HARQ-ACK feedback time; Corresponding HARQ-ACK; the second subcodebook is used to feedback the HARQ-ACK corresponding to the PDSCH of the indicated time slot in the current channel occupation time.
  • the generating unit 402 may be configured to, when receiving downlink control information issued by the base station, learn that HARQ-ACK corresponding to the PDSCH of the last X timeslots is fed back in other timeslots. , Setting the HARQ-ACK corresponding to the PDSCH fed back in another slot to NACK in the first subcodebook.
  • the generating unit 402 may be configured to, in the second sub-codebook, when it is detected that PDSCH processing of a time slot in a feedback time for the HARQ-ACK cannot be completed, change the The HARQ-ACK of the PDSCH corresponding to the time slot that cannot be processed is set to NACK.
  • the user terminal 40 may further include: a feedback unit 403, configured to feedback the semi-static HARQ-ACK codebook to the base station.
  • the first subcodebook and the second subcodebook may be sequentially arranged in chronological order.
  • the value of X may be configured by the base station through high-level signaling.
  • the receiving unit 401 may be configured to receive downlink control information issued by a base station; and obtain the feedback time of the HARQ-ACK from the downlink control information.
  • An embodiment of the present invention also provides a computer-readable storage medium having computer instructions stored thereon, where the computer instructions execute the steps of the method for generating a semi-static HARQ-ACK codebook provided by any one of the foregoing embodiments of the present invention. .
  • An embodiment of the present invention further provides another user terminal, including a memory and a processor.
  • the memory stores computer instructions executable on the processor, and the processor executes the present invention when the processor runs the computer instructions. Steps of the method for generating a semi-static HARQ-ACK codebook provided by any of the foregoing embodiments.
  • the program may be stored in a computer-readable storage medium.
  • the storage medium may include: ROM, RAM, disk or optical disc, etc.

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Abstract

一种半静态HARQ-ACK码本的生成方法、用户终端、可读存储介质，所述方法包括：接收基站下发的PDSCH以及HARQ-ACK的反馈时间，所述基站下发的PDSCH为所述基站检测到LBT成功后发送的；根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本；所述半静态HARQ-ACK码本包括第一子码本以及第二子码本，其中：所述第一子码本用于反馈所述HARQ-ACK的反馈时间中，所指示的前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK；所述第二子码本用于反馈所述HARQ-ACK的反馈时间在所述当前信道占用时间中，所指示的时隙的PDSCH对应的HARQ-ACK。上述方案能够灵活地指示HARQ-ACK反馈时间。

Description

半静态HARQ-ACK码本的生成方法、用户终端、可读存储介质
本申请要求于2018年08月10日提交中国专利局、申请号为201810908042.3、发明名称为“半静态HARQ-ACK码本的生成方法、用户终端、可读存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及无线通信领域，尤其涉及一种半静态HARQ-ACK码本的生成方法、用户终端、可读存储介质。
背景技术
混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)，是一种结合前向纠错(Forward Error Correction，FEC)与自动重传请求(Automatic Repeat reQuest，ARQ)方法的技术。FEC通过添加冗余信息，使得接收端能够纠正一部分错误，从而减少重传的次数。对于FEC无法纠正的错误，接收端会通过ARQ机制请求发送端重发数据。接收端使用检错码，通常为循环冗余校验(Cyclic Redundancy Check，CRC)，来检测接收到的数据包是否出错。如果无错，则接收端会发送一个肯定的确认(ACK)给发送端，发送端收到ACK后，会接着发送下一个数据包。如果出错，则接收端会丢弃该数据包，并发送一个否定的确认(NACK)给发送端，发送端收到NACK后， 会重发相同的数据。
新空口(New Radio，NR)支持一个时隙内可以有多个监听时刻，每个监听时刻都可以调度物理下行共享信道(Physical Downlink Shared Channel，PDSCH)，一个时隙内可以调度多个PDSCH。同时，NR支持时域资源分配，当PDSCH的映射类型为Type B时，每个PDSCH可以是2、4、7个OFDM符号，每个PDSCH起始OFDM符号没有限制，因此一个时隙内可以传输多个PDSCH，故需要对多个PDSCH进行HARQ-ACK反馈。半静态HARQ-ACK码本需要考虑所有可能的情况(也就是最恶劣的情况)，来确定HARQ-ACK比特数，这样可以确保在下行控制信息(Downlink Control Information，DCI)漏检的情况下正确的反馈其他PDSCH的HARQ-ACK信息，但是却会造成PUCCH资源的严重浪费，因此在设计半静态HARQ-ACK码本时应尽可能的减少码本长度。
目前半静态HARQ-ACK码本设计时，考虑了小区半静态上下行配置的情况，将下行调度与小区半静态上下行配置冲突的情况排除掉以减少半静态码本的大小。此外，如果UE没有上报可以支持在一个时隙接收多个PDSCH的能力，那么会认为UE在一个时隙只会接收一个PDSCH，否则，UE根据时域资源配置来确定每个时隙最多可能收到的PDSCH从而确定半静态HARQ-ACK码本长度。
现有技术中，用户终端根据基站下发的HARQ-ACK的反馈时间(k1)，生成相应的半静态HARQ-ACK码本并反馈给基站。然而，由于非授权频段的不确定性，k1可能指示的是一个灵活的时间而不 是一个确定的时间，导致用户终端难以根据k1的值生成相应的半静态HARQ-ACK码本并反馈。
发明内容
本发明实施例解决的是半静态HARQ-ACK码本无法支持灵活指示HARQ-ACK反馈时间的技术问题。
为解决上述技术问题，本发明实施例提供一种半静态HARQ-ACK码本的生成方法，包括：接收基站下发的PDSCH以及HARQ-ACK的反馈时间，所述基站下发的PDSCH为所述基站检测到LBT成功后发送的；根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本；所述半静态HARQ-ACK码本包括第一子码本以及第二子码本，其中：所述第一子码本用于反馈所述HARQ-ACK的反馈时间中，所指示的前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK；所述第二子码本用于反馈所述HARQ-ACK的反馈时间在所述当前信道占用时间中，所指示的时隙的PDSCH对应的HARQ-ACK。
可选的，所述生成半静态HARQ-ACK码本，包括：当从接收到所述基站下发的下行控制信息中，获知所述最后X个时隙的PDSCH对应的HARQ-ACK在其他时隙反馈时，在所述第一子码本中将所述在其他时隙反馈的PDSCH对应的HARQ-ACK设置为NACK。
可选的，所述生成半静态HARQ-ACK码本，包括：在所述第二 子码本中，当检测到存在无法完成对所述HARQ-ACK的反馈时间中时隙的PDSCH处理时，将所述无法完成处理的时隙对应的PDSCH的HARQ-ACK设置为NACK。
可选的，在生成半静态HARQ-ACK码本后，还包括：将所述半静态HARQ-ACK码本反馈至所述基站。
可选的，所述第一子码本与所述第二子码本按照时间顺序依次排列。
可选的，所述X的值由所述基站通过高层信令配置。
可选的，所述接收基站下发的HARQ-ACK的反馈时间，包括：接收基站下发的下行控制信息；从所述下行控制信息中，获取所述HARQ-ACK的反馈时间。
本发明实施例还提供了一种用户终端，包括：接收单元，用于接收基站下发的PDSCH以及HARQ-ACK的反馈时间，所述基站下发的PDSCH为所述基站检测到LBT成功后发送的；生成单元，用于根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本；所述半静态HARQ-ACK码本包括第一子码本以及第二子码本，其中：所述第一子码本用于反馈所述HARQ-ACK的反馈时间中，所指示的前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK；所述第二子码本用于反馈所述HARQ-ACK的反馈时间在所述当前信道占用时间中，所指示的时隙的PDSCH对应的HARQ-ACK。
可选的，所述生成单元，用于当从接收到所述基站下发的下行控制信息中，获知所述最后X个时隙的PDSCH对应的HARQ-ACK在其他时隙反馈时，在所述第一子码本中将所述在其他时隙反馈的PDSCH对应的HARQ-ACK设置为NACK。
可选的，所述生成单元，用于在所述第二子码本中，当检测到存在无法完成对所述HARQ-ACK的反馈时间中时隙的PDSCH处理时，将所述无法完成处理的时隙对应的PDSCH的HARQ-ACK设置为NACK。
可选的，所述用户终端还包括：反馈单元，用于将所述半静态HARQ-ACK码本反馈至所述基站。
可选的，所述第一子码本与所述第二子码本按照时间顺序依次排列。
可选的，所述X的值由所述基站通过高层信令配置。
可选的，所述接收单元，用于接收基站下发的下行控制信息；从所述下行控制信息中，获取所述HARQ-ACK的反馈时间。
本发明实施例还提供了一种计算机可读存储介质，其上存储有计算机指令，所述计算机指令运行时执行上述任一种所述的半静态HARQ-ACK码本的生成方法的步骤。
本发明实施例还提供了一种用户终端，包括存储器和处理器，所述存储器上存储有可在所述处理器上运行的计算机指令，所述处理器运行所述计算机指令运行时执行上述任一种所述的半静态 HARQ-ACK码本的生成方法的步骤。
与现有技术相比，本发明实施例的技术方案具有以下有益效果：
用户终端可以根据基站下发的PDSCH以及HARQ-ACK的反馈时间，生成半静态HARQ-ACK码本。用户终端生成的半静态HARQ-ACK码本包括第一子码本以及第二子码本，第一子码本用于反馈前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK，第二子码本用于反馈HARQ-ACK的反馈时间在当前信道占用时间所指示的时隙的PDSCH对应的HARQ-ACK。在基站指示的HARQ-ACK的反馈时间较为灵活时，用户终端仍可以生成与之相对应的半静态HARQ-ACK码本并反馈。
附图说明
图1是本发明实施例中的一种半静态HARQ-ACK码本的生成方法的流程图；
图2是本发明实施例中的一种COT与半静态HARQ-ACK码本反馈的示意图；
图3是本发明实施例中的另一种COT与半静态HARQ-ACK码本反馈的示意图；
图4是本发明实施例中的一种用户终端的结构示意图。
具体实施方式
现有技术中，用户终端根据基站下发的HARQ-ACK的反馈时间(k1)，生成相应的半静态HARQ-ACK码本并反馈给基站。然而，由于非授权频段的不确定性，k1可能指示的是一个灵活的时间而不是一个确定的时间，导致用户终端难以根据k1的值生成相应的半静态HARQ-ACK码本并反馈。
用户终端可以根据基站下发的PDSCH以及HARQ-ACK的反馈时间，生成半静态HARQ-ACK码本。用户终端生成的半静态HARQ-ACK码本包括第一子码本以及第二子码本，第一子码本用于反馈前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK，第二子码本用于反馈HARQ-ACK的反馈时间在当前信道占用时间所指示的时隙的PDSCH对应的HARQ-ACK。在基站指示的HARQ-ACK的反馈时间较为灵活时，用户终端仍可以生成与之相对应的半静态HARQ-ACK码本并反馈。
为使本发明的上述目的、特征和有益效果能够更为明显易懂，下面结合附图对本发明的具体实施例做详细的说明。
本发明实施例提供了一种半静态HARQ-ACK码本的生成方法，参照图1，以下通过具体步骤进行详细说明。
步骤S101，接收基站下发的PDSCH以及HARQ-ACK的反馈时间。
在具体实施中，基站在检测到先听后说(Listen Before Talk，LBT) 成功后，向用户终端下发PDSCH，并为用户终端配置相应的HARQ-ACK的反馈时间。
在具体实施中，基站可以通过DCI为用户终端配置相应的HARQ-ACK的反馈时间，并将DCI发送至用户终端。用户终端接收基站下发的DCI，并从中获取基站配置的HARQ-ACK的反馈时间。
步骤S102，根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本。
在本发明实施例中，半静态HARQ-ACK码本可以包括第一子码本以及第二子码本，其中：第一子码本用于反馈HARQ-ACK的反馈时间中，所指示的前一信道占用时间(Channel Occupy Time，COT)的最后X个时隙的PDSCH对应的HARQ-ACK；第二子码本用于反馈HARQ-ACK的反馈时间中，所指示的当前COT中时隙的PDSCH对应的HARQ-ACK。
在具体实施中，X可以由基站配置，并由基站通过高层信令向用户终端下发。用户终端在接收到基站下发的高层信令后，即可从中获知基站所配置的X的值。
在实际应用中，基站可以根据实际的应用场景设置X的取值。例如，设置X＝2。又如，设置X＝4。
在具体实施中，用户终端在生成半静态HARQ-ACK码本的过程中，若从基站下发的DCI中获知最后X个时隙的PDSCH对应的HARQ-ACK在其他时隙反馈时，在第一码本中，将在其他时隙反馈 的PDSCH对应的HARQ-ACK设置为NACK。
例如，X＝2。最后2个slot依次为slot M-1、slot M，基站在DCI中指示slot M-1的PDSCH对应的HARQ-ACK在其他时隙反馈，则在第一子码本中，将slot M-1的PDSCH对应的HARQ-ACK设置为NACK。
在具体实施中，用户终端在生成半静态HARQ-ACK码本的过程中，若检测到无法完成对HARQ-ACK的反馈时间中的slot的PDSCH处理时，在第二子码本中，可以将无法完成处理的slot对应的PDSCH的HARQ-ACK设置为NACK。
例如，当前COT中，slot N为最后一个slot，且基站指示用户终端反馈slot N的PDSCH对应的HARQ-ACK。用户终端在slot N向基站反馈物理上行控制信道(Physical Uplink Control Channel，PUCCH)。用户终端在向基站反馈PUCCH时，没有完成对slot N的PDSCH的处理，因此，在第二子码本中，将slot N对应的PDSCH的HARQ-ACK设置为NACK。
在具体实施中，用户终端可以预先向基站反馈自身的处理能力。基站可以根据用户终端发送的处理能力，为用户终端配置相应的HARQ-ACK的反馈时间。若基站为用户终端配置的HARQ-ACK的反馈时间超出了用户终端自身的处理能力，则用户终端在生成第二子码本时，将超出用户终端自身处理能力的反馈时间对应的PDSCH的HARQ-ACK设置为NACK。
在具体实施中，第一子码本与第二子码本可以按照时间顺序依次排列，也即在时间轴上，基站接收到用户终端反馈的半静态HARQ-ACK码本时，首先处理第一子码本，之后再处理第二子码本。
通过将第一子码本设置在第二子码本之前，保证半静态HARQ-ACK码本按照时间先后顺序排列，以便于基站进行相应的处理。
在具体实施中，用户终端在生成半静态HARQ-ACK码本之后，可以将生成的半静态HARQ-ACK码本反馈至基站。
下面通过举例对本发明上述实施例中提供的半静态HARQ-ACK码本的生成方法进行说明。
参照图2，给出了本发明实施例中的一种COT与半静态HARQ-ACK码本反馈的示意图。
图2中，设定基站下行采用15kHz的子载波间隔(Sub-Carrier Spacing，SCS)，PDSCH配置了附加的(additional)解调参考信号(Demodulation Reference Signal，DMRS)。用户终端在接收到PDSCH的最后一个OFDM符号后，需要13个OFDM符号的处理时间才能反馈上行HARQ-ACK。COT1包括四个slot，依次为slot M-3、slot M-2、slot M-1以及slot M；COT2包括四个slot，依次为slot N-3、slot N-2、slot N-1以及slot N。
基站通过高层信令，配置用户终端使用半静态HARQ-ACK码本来反馈下行数据(也即PDSCH)的HARQ-ACK信息。在高层信令 中，基站配置X＝2，也即：针对COT1，最后两个slot(slot M-1、slot M)对应的PDSCH的HARQ-ACK在COT2中反馈。对于DCI格式1_0，k1的集合为{1，2，3，4}，k1的值即为反馈时间。
用户终端没有向基站上报在一个slot可以接收多个PDSCH的能力，即用户终端在一个slot只能接收一个PDSCH。
基站在调度时，对于slot M-3、slot M-2、slot N-3、slot N-2的PDSCH，在DCI中基站会指示确定的k1的值。在本例中，针对slot M-3，对应的k1值为3；针对slot M-2，对应的k1值为2；针对slot N-3，对应的k1值为3；针对slot N-2，对应的k1值为2。对于slot M-1、slot M的PDSCH，DCI仅指示在下一个COT反馈，没有指示确定的时间。此时基站并不知道下个COT开始的时间，也即基站并不知道下一次LBT成功的时间，因此无法确定slot M-1、slot M的PDSCH对应的k1的值。
在COT1中，用户终端在slot M向基站反馈PUCCH。在slot M，用户终端只完成对slot M-3对应的PDSCH以及slot M-2对应的PDSCH的处理。因此，对于用户终端在slot M反馈的PUCCH，可以将slot M-3对应的PDSCH的HARQ-ACK以及slot M-2对应的PDSCH的HARQ-ACK向基站反馈。
而对于slot M-1的PDSCH以及slot M的PDSCH，用户终端在slot M反馈PUCCH时，由于没有完成对slot M-1的PDSCH以及slot M的PDSCH的处理，因此，slot M-1的PDSCH的HARQ-ACK以及 slot M的PDSCH的HARQ-ACK在下一个COT(COT2)反馈。
基站在slot N-3LBT成功后，继续向用户终端发送PDSCH。用户终端在slot N向基站反馈PUCCH，在slot N，用户终端可以完成对slot N-3、slot N-2接收到的PDSCH的处理。因此，用户终端在slot N向基站反馈PUCCH时，可以将slot N-3对应的PDSCH的HARQ-ACK以及slot N-2对应的PDSCH的HARQ-ACK向基站反馈。
而对于slot N-1的PDSCH以及slot N的PDSCH，用户终端在slot N反馈PUCCH时，由于没有完成对slot N-1的PDSCH以及slot N的PDSCH的处理，因此，slot N-1的PDSCH的HARQ-ACK以及slot N的PDSCH的HARQ-ACK在下一个COT反馈。
对于slot N反馈的半静态HARQ-ACK码本，第一子码本的长度为2比特，第二子码本的长度为4比特。针对第一子码本：第一个比特用于反馈slot M-1对应的PDSCH的HARQ-ACK，第二个比特用于反馈slot M对应的PDSCH的HARQ-ACK。针对第二子码本：第一个比特用于反馈slot N-4对应的PDSCH的HARQ-ACK，在本例中slot N-4对应的PDSCH的HARQ-ACK为NACK；第二个比特用于反馈slot N-3对应的PDSCH的HARQ-ACK；第三个比特用于反馈slot N-2对应的PDSCH的HARQ-ACK；第四个比特用于反馈slot N-1对应的PDSCH的HARQ-ACK，本例中slot N-1对应的PDSCH的HARQ-ACK为NACK。第一子码本位于第二子码本前面，半静态HARQ-ACK码本的总长度为6比特。
参照表1，给出了用户终端在slot N向基站反馈的半静态HARQ-ACK码本。
表1
Figure PCTCN2019092978-appb-000001
表1中，码字1与码字2组成第一子码本，码字3～码字6组成第二子码本。
参照图3，给出了本发明实施例中的另一种COT与半静态HARQ-ACK码本反馈的示意图。
图3中，设定基站下行采用15KHz的SCS，PDSCH只配置了前置加载(front loaded)DMRS。用户终端在接收到PDSCH的最后一个OFDM符号后，需要8个OFDM符号的处理事件才能反馈上行HARQ-ACK。
基站通过高层信令，配置用户终端使用半静态HARQ-ACK码本来反馈下行数据(也即PDSCH)的HARQ-ACK信息。在高层信令中，基站配置X＝2，也即：针对COT1，最后两个slot(slot M-1、slot M)对应的PDSCH的HARQ-ACK在COT2中反馈。对于DCI格式1_0，k1的集合为{1，2，3，4}，k1的值即为反馈时间。
用户终端没有向基站上报在一个slot可以接收多个PDSCH的能 力，即用户终端在一个slot只能接收一个PDSCH。
基站在调度时，对于slot M-3、slot M-2、slot M-1、slot N-3、slot N-2的PDSCH，在DCI中基站会指示确定的k1的值。在本例中，针对slot M-3，对应的k1值为3；针对slot M-2，对应的k1值为2；针对slot M-1，对应的k1值为1；针对slot N-3，对应的k1值为3；针对slot N-2，对应的k1值为2。对于slot M的PDSCH，DCI仅指示在下一个COT反馈，没有指示确定的时间。此时基站并不知道下个COT开始的时间，也即基站并不知道下一次LBT成功的时间，因此无法确定slot M的PDSCH对应的k1的值。
在COT1中，用户终端在slot M向基站反馈PUCCH。在slot M，用户终端只完成对slot M-3对应的PDSCH、slot M-2对应的PDSCH以及slot M-2对应的PDSCH的处理。因此，对于用户终端在slot M反馈的PUCCH，可以将slot M-3对应的PDSCH的HARQ-ACK、slot M-2对应的PDSCH的HARQ-ACK以及slot M-1对应的PDSCH的HARQ-ACK向基站反馈。
而对于slot M的PDSCH，用户终端在slot M反馈PUCCH时，由于没有完成对slot M的PDSCH的处理，因此，slot M的PDSCH的HARQ-ACK在下一个COT(COT2)反馈。
基站在slot N-3LBT成功后，继续向用户终端发送PDSCH。用户终端在slot N向基站反馈PUCCH，在slot N，用户终端可以完成对slot N-3、slot N-2接收到的PDSCH的处理。因此，用户终端在slot N 向基站反馈PUCCH时，可以将slot N-3对应的PDSCH的HARQ-ACK以及slot N-2对应的PDSCH的HARQ-ACK向基站反馈。
而对于slot N-1的PDSCH以及slot N的PDSCH，用户终端在slot N反馈PUCCH时，由于没有完成对slot N-1的PDSCH以及slot N的PDSCH的处理，因此，slot N-1的PDSCH的HARQ-ACK以及slot N的PDSCH的HARQ-ACK在下一个COT反馈。
对于slot N反馈的半静态HARQ-ACK码本，第一子码本的长度为2比特，第二子码本的长度为4比特。针对第一子码本：第一个比特用于反馈slot M-1对应的PDSCH的HARQ-ACK，第二个比特用于反馈slot M对应的PDSCH的HARQ-ACK。由于slot M-1的PDSCH由DCI指示在slot M反馈，因此在第一子码本中，slot M-1的PDSCH对应的HARQ-ACK为NACK。
针对第二子码本：第一个比特用于反馈slot N-4对应的PDSCH的HARQ-ACK，在本例中slot N-4对应的PDSCH的HARQ-ACK为NACK；第二个比特用于反馈slot N-3对应的PDSCH的HARQ-ACK；第三个比特用于反馈slot N-2对应的PDSCH的HARQ-ACK；第四个比特用于反馈slot N-1对应的PDSCH的HARQ-ACK，本例中slot N-1对应的PDSCH的HARQ-ACK为NACK。第一子码本位于第二子码本前面，半静态HARQ-ACK码本的总长度为6比特。
参照表2，给出了用户终端在slot N向基站反馈的半静态HARQ-ACK码本。
表2
Figure PCTCN2019092978-appb-000002
表2中，码字1与码字2组成第一子码本，码字3～码字6组成第二子码本。
参照图4，给出了本发明实施例中的一种用户终端40，包括：接收单元401、生成单元402以及反馈单元403，其中：
接收单元401，用于接收基站下发的PDSCH以及HARQ-ACK的反馈时间，所述基站下发的PDSCH为所述基站检测到LBT成功后发送的；
生成单元402，用于根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本；所述半静态HARQ-ACK码本包括第一子码本以及第二子码本，其中：所述第一子码本用于反馈所述HARQ-ACK的反馈时间中，所指示的前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK；所述第二子码本用于反馈所述HARQ-ACK的反馈时间在所述当前信道占用时间中，所指示的时隙的PDSCH对应的HARQ-ACK。
在具体实施中，所述生成单元402，可以用于当从接收到所述基站下发的下行控制信息中，获知所述最后X个时隙的PDSCH对应的 HARQ-ACK在其他时隙反馈时，在所述第一子码本中将所述在其他时隙反馈的PDSCH对应的HARQ-ACK设置为NACK。
在具体实施中，所述生成单元402，可以用于在所述第二子码本中，当检测到存在无法完成对所述HARQ-ACK的反馈时间中时隙的PDSCH处理时，将所述无法完成处理的时隙对应的PDSCH的HARQ-ACK设置为NACK。
在具体实施中，所述用户终端40还可以包括：反馈单元403，用于将所述半静态HARQ-ACK码本反馈至所述基站。
在具体实施中，所述第一子码本与所述第二子码本可以按照时间顺序依次排列。
在具体实施中，所述X的值可以由所述基站通过高层信令配置。
在具体实施中，所述接收单元401，可以用于接收基站下发的下行控制信息；从所述下行控制信息中，获取所述HARQ-ACK的反馈时间。
本发明实施例还提供了一种计算机可读存储介质，其上存储有计算机指令，所述计算机指令运行时执行本发明上述任一实施例提供的半静态HARQ-ACK码本的生成方法的步骤。
本发明实施例还提供了另一种用户终端，包括存储器和处理器，所述存储器上存储有可在所述处理器上运行的计算机指令，所述处理器运行所述计算机指令时执行本发明上述任一实施例提供的半静态HARQ-ACK码本的生成方法的步骤。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指示相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：ROM、RAM、磁盘或光盘等。
虽然本发明披露如上，但本发明并非限定于此。任何本领域技术人员，在不脱离本发明的精神和范围内，均可作各种更动与修改，因此本发明的保护范围应当以权利要求所限定的范围为准。

Claims (16)

  1. 一种半静态HARQ-ACK码本的生成方法，其特征在于，包括：接收基站下发的PDSCH以及HARQ-ACK的反馈时间，所述基站下发的PDSCH为所述基站检测到LBT成功后发送的；
    根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本；
    所述半静态HARQ-ACK码本包括第一子码本以及第二子码本，其中：所述第一子码本用于反馈所述HARQ-ACK的反馈时间中，所指示的前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK；
    所述第二子码本用于反馈所述HARQ-ACK的反馈时间在所述当前信道占用时间中，所指示的时隙的PDSCH对应的HARQ-ACK。
  2. 如权利要求1所述的半静态HARQ-ACK码本的生成方法，其特征在于，所述生成半静态HARQ-ACK码本，包括：
    当从接收到所述基站下发的下行控制信息中，获知所述最后X个时隙的PDSCH对应的HARQ-ACK在其他时隙反馈时，在所述第一子码本中将所述在其他时隙反馈的PDSCH对应的HARQ-ACK设置为NACK。
  3. 如权利要求1所述的半静态HARQ-ACK码本的生成方法，其特征在于，所述生成半静态HARQ-ACK码本，包括：
    在所述第二子码本中，当检测到存在无法完成对所述HARQ-ACK的反馈时间中时隙的PDSCH处理时，将所述无法完成处理的时隙对应的PDSCH的HARQ-ACK设置为NACK。
  4. 如权利要求1所述的半静态HARQ-ACK码本的生成方法，其特征在于，在生成半静态HARQ-ACK码本后，还包括：
    将所述半静态HARQ-ACK码本反馈至所述基站。
  5. 如权利要求1所述的半静态HARQ-ACK码本的生成方法，其特征在于，所述第一子码本与所述第二子码本按照时间顺序依次排列。
  6. 如权利要求1所述的半静态HARQ-ACK码本的生成方法，其特征在于，所述X的值由所述基站通过高层信令配置。
  7. 如权利要求1所述的半静态HARQ-ACK码本的生成方法，其特征在于，所述接收基站下发的HARQ-ACK的反馈时间，包括：
    接收基站下发的下行控制信息；
    从所述下行控制信息中，获取所述HARQ-ACK的反馈时间。
  8. 一种用户终端，其特征在于，包括：
    接收单元，用于接收基站下发的PDSCH以及HARQ-ACK的反馈时间，所述基站下发的PDSCH为所述基站检测到LBT成功后发送的；生成单元，用于根据所述基站下发的PDSCH以及所述HARQ-ACK的反馈时间，在当前信道占用时间中，生成半静态HARQ-ACK码本；所述半静态HARQ-ACK码本包括第一子码本以及第二子码本，其中：所述第一子码本用于反馈所述HARQ-ACK的反馈时间中，所指示的前一信道占用时间的最后X个时隙的PDSCH对应的HARQ-ACK；所述第二子码本用于反馈所述HARQ-ACK的反馈时间在所述当前信道占用时间中，所指示的时隙的PDSCH对应的HARQ-ACK。
  9. 如权利要求8所述的用户终端，其特征在于，所述生成单元，用 于当从接收到所述基站下发的下行控制信息中，获知所述最后X个时隙的PDSCH对应的HARQ-ACK在其他时隙反馈时，在所述第一子码本中将所述在其他时隙反馈的PDSCH对应的HARQ-ACK设置为NACK。
  10. 如权利要求8所述的用户终端，其特征在于，所述生成单元，用于在所述第二子码本中，当检测到存在无法完成对所述HARQ-ACK的反馈时间中时隙的PDSCH处理时，将所述无法完成处理的时隙对应的PDSCH的HARQ-ACK设置为NACK。
  11. 如权利要求8所述的用户终端，其特征在于，还包括：反馈单元，用于将所述半静态HARQ-ACK码本反馈至所述基站。
  12. 如权利要求8所述的用户终端，其特征在于，所述第一子码本与所述第二子码本按照时间顺序依次排列。
  13. 如权利要求8所述的用户终端，其特征在于，所述X的值由所述基站通过高层信令配置。
  14. 如权利要求8所述的用户终端，其特征在于，所述接收单元，用于接收基站下发的下行控制信息；从所述下行控制信息中，获取所述HARQ-ACK的反馈时间。
  15. 一种计算机可读存储介质，其上存储有计算机指令，其特征在于，所述计算机指令运行时执行权利要求1～7任一项所述的半静态HARQ-ACK码本的生成方法的步骤。
  16. 一种用户终端，包括存储器和处理器，所述存储器上存储有可在所述处理器上运行的计算机指令，其特征在于，所述处理器运行所述 计算机指令时执行权利要求1～7任一项所述的半静态HARQ-ACK码本的生成方法的步骤。
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