WO2020038340A1 - 一种harq反馈方法和装置 - Google Patents

一种harq反馈方法和装置 Download PDF

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Publication number
WO2020038340A1
WO2020038340A1 PCT/CN2019/101434 CN2019101434W WO2020038340A1 WO 2020038340 A1 WO2020038340 A1 WO 2020038340A1 CN 2019101434 W CN2019101434 W CN 2019101434W WO 2020038340 A1 WO2020038340 A1 WO 2020038340A1
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WIPO (PCT)
Prior art keywords
information
harq feedback
terminal
indication information
time
Prior art date
Application number
PCT/CN2019/101434
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English (en)
French (fr)
Inventor
贾琼
朱俊
吴霁
Original Assignee
华为技术有限公司
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
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CA3109733A priority Critical patent/CA3109733A1/en
Priority to EP19852926.5A priority patent/EP3832931A4/en
Priority to BR112021003006-9A priority patent/BR112021003006A2/pt
Publication of WO2020038340A1 publication Critical patent/WO2020038340A1/zh
Priority to US17/177,869 priority patent/US20210176017A1/en

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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
    • 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
    • H04L1/1829—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
    • H04L1/18—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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a HARQ feedback method and device.
  • LAA Licensed Assisted Access
  • eLAA Enhanced LAA
  • the transmitting end first monitors whether an unlicensed channel (or unlicensed spectrum) is idle before sending a signal. For example, the transmitting end judges its busy status by detecting the power of the received signal on the unlicensed spectrum. If the power of the received signal is less than a certain threshold, the unlicensed spectrum is considered to be idle. The sender can send signals on the unlicensed spectrum, otherwise it will not send signals. This mechanism of listening before sending is called Listen Before Send (LBT).
  • LBT Listen Before Send
  • Hybrid Automatic Repeat Request Hybrid ARQ or HARQ
  • the embodiments of the present application provide a HARQ feedback method and device, which can effectively ensure the transmission of HARQ feedback.
  • an embodiment of the present application provides a HARQ feedback method, including: a base station sending first indication information, where the first indication information is used to instruct a terminal to perform HARQ feedback; the base station sends second indication information, the The second indication information includes second time information for instructing the terminal to perform HARQ feedback; the base station receives the HARQ feedback information of the terminal.
  • the base station may send the first indication information within a first channel occupation time (COT), and send the second indication information within a second COT.
  • COT channel occupation time
  • the terminal can access the channel through the CAT2 mode. Compared with the CAT4 access channel based on random backoff, the CAT2 access channel has a higher probability.
  • the HARQ feedback of the two-step scheduling can shorten the scheduling delay compared to directly performing the HARQ feedback based on the LBT results, so that the probability of losing a channel will also be reduced.
  • the terminal channel access probability can be improved, and further, the transmission of HARQ feedback can be effectively guaranteed.
  • the second time information includes a time offset of the time when the HARQ feedback is performed relative to the second indication information, or the second time information includes an absolute time when the HARQ feedback is performed.
  • a time offset between the base station sending the first indication information and sending the second indication information is not greater than a preset duration.
  • the first indication information further includes information for indicating the preset duration.
  • the second indication information further includes information for allocating one or more HARQ feedback resources to the terminal.
  • the second indication information further includes information of multiple HARQ feedback resources allocated to multiple terminals, where each terminal of the multiple terminals is allocated one or more HARQ feedback resources, and A plurality of terminals include the terminals.
  • the first indication information further includes first time information, and the first time information includes a first time offset; the first time information is used to indicate that the terminal is relatively HARQ feedback is performed on one or more HARQ feedback resources where the information sending time offset is the first time offset and the second time offset.
  • an embodiment of the present application provides a HARQ feedback method, including: receiving, by a terminal, first indication information, where the first indication information is used to instruct the terminal to perform HARQ feedback; and the terminal receives second indication information,
  • the second indication information includes second time information for instructing the terminal to perform HARQ feedback; the terminal sends HARQ feedback information to a base station.
  • the terminal receives the first indication information within a first channel occupation time COT of the base station, and receives the second indication information within a second COT of the base station.
  • the terminal can access the channel through the CAT2 mode. Compared with the CAT4 access channel based on random backoff, the CAT2 access channel has a higher probability.
  • the HARQ feedback of the two-step scheduling can shorten the scheduling delay compared to directly performing the HARQ feedback based on the LBT results, so that the probability of losing a channel will also be reduced.
  • the terminal channel access probability can be improved, and further, the transmission of HARQ feedback can be effectively guaranteed.
  • the second time information includes a time offset of the time when the HARQ feedback is performed relative to the second indication information, or the second time information includes an absolute time when the HARQ feedback is performed.
  • a time offset between the base station sending the first indication information and sending the second indication information is not greater than a preset duration.
  • the first indication information further includes information for indicating the preset duration.
  • the second indication information further includes information for allocating one or more HARQ feedback resources to the terminal.
  • the second indication information further includes information of multiple HARQ feedback resources allocated to multiple terminals, where each terminal of the multiple terminals is allocated one or more HARQ feedback resources, and A plurality of terminals include the terminals.
  • the first indication information further includes first time information, and the first time information includes a first time offset; the first time information is used to indicate that the terminal is relatively HARQ feedback is performed on one or more HARQ feedback resources where the information sending time offset is the first time offset and the second time offset.
  • an embodiment of the present application provides a base station, including a transmitter and a receiver.
  • the transmitter is configured to send first indication information, the first indication information is used to instruct the terminal to perform HARQ feedback; and the second indication information is used to send, the second indication information includes used to instruct the terminal to perform HARQ feedback second time information;
  • the receiver is configured to receive HARQ feedback information of the terminal.
  • the base station may send the first indication information at the first COT and the second indication information at the second COT. Or the base station performs the LBT operation after sending the first instruction information.
  • the second time information includes a time offset of the time when the HARQ feedback is performed relative to the second indication information, or the second time information includes an absolute time when the HARQ feedback is performed.
  • a time offset between the base station sending the first indication information and sending the second indication information is not greater than a preset duration.
  • the first indication information further includes information for indicating the preset duration.
  • the second indication information further includes information for allocating one or more HARQ feedback resources to the terminal.
  • the second indication information further includes information of multiple HARQ feedback resources allocated to multiple terminals, where each terminal of the multiple terminals is allocated one or more HARQ feedback resources, and A plurality of terminals include the terminals.
  • the first indication information further includes first time information, and the first time information includes a first time offset; the first time information is used to indicate that the terminal is relatively HARQ feedback is performed on one or more HARQ feedback resources where the information sending time offset is the first time offset and the second time offset.
  • an embodiment of the present application provides a terminal, including a transmitter and a receiver.
  • the receiver is configured to receive first instruction information, where the first instruction information is used to instruct the terminal to perform HARQ feedback; and to receive second instruction information, where the second instruction information includes used to instruct the terminal to perform HARQ feedback second time information; the transmitter sends HARQ feedback information to a base station.
  • the second time information includes a time offset of the time when the HARQ feedback is performed relative to the second indication information, or the second time information includes an absolute time when the HARQ feedback is performed.
  • a time offset between the base station sending the first indication information and sending the second indication information is not greater than a preset duration.
  • the first indication information further includes information for indicating the preset duration.
  • the second indication information further includes information for allocating one or more HARQ feedback resources to the terminal.
  • the second indication information further includes information of multiple HARQ feedback resources allocated to multiple terminals, where each terminal of the multiple terminals is allocated one or more HARQ feedback resources, and A plurality of terminals include the terminals.
  • the first indication information further includes first time information, and the first time information includes a first time offset; the first time information is used to indicate that the terminal is relatively HARQ feedback is performed on one or more HARQ feedback resources where the information sending time offset is the first time offset and the second time offset.
  • an embodiment of the present application provides a communication system including a base station and a terminal.
  • the base station is the base station described in the third aspect; and the terminal is the terminal described in the fourth aspect.
  • an embodiment of the present application provides a chip that is connected to a memory and is configured to read and execute a software program stored in the memory to implement any one of the first to second aspects or Any method provided by any aspect of the design.
  • an embodiment of the present application provides a chip, where the chip includes a processor and a memory, and the processor is configured to read a software program stored in the memory to implement any of the first to second aspects. Methods provided by one aspect or any aspect of the design.
  • an embodiment of the present application further provides a computer-readable storage medium for storing a computer used to execute a function designed in any one of the first to third aspects or any one of the aspects.
  • Software instructions which include a program designed to execute any one of the first aspect to the second aspect or any one of the designs above.
  • an embodiment of the present application provides a computer program product including instructions, which, when run on a computer, causes the computer to execute the foregoing first aspect or any one or any of the foregoing first to second aspects Any of the aspects design the method described.
  • Figure 1 is a communication system
  • FIG. 2 provides a HARQ feedback method according to an embodiment of the present application
  • FIG. 3 is a timing diagram of a HARQ feedback
  • FIG. 4 is a timing diagram of another HARQ feedback
  • FIG. 5 is a schematic structural diagram of a first indication information
  • FIG. 6 is a schematic structural diagram of a second indication information
  • FIG. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • the embodiments of the present application may be applied to a 5G system, and may also be applied to other communication systems.
  • the communication system includes, but is not limited to, a long term evolution (LTE) system, a long term evolution (advanced) (LTE-A) system, a new radio (NR) system, and a 5G (5 th Communication systems such as generation systems can also be extended to systems such as wireless fidelity (WiFi) systems and worldwide interoperability for microwave access (wimax) systems.
  • LTE long term evolution
  • LTE-A long term evolution
  • NR new radio
  • 5G 5 th Communication systems such as generation systems can also be extended to systems such as wireless fidelity (WiFi) systems and worldwide interoperability for microwave access (wimax) systems.
  • WiFi wireless fidelity
  • wimax worldwide interoperability for microwave access
  • Figure 1 shows a communication system.
  • a base station (BS) and terminals 1 to 6 form a communication system.
  • terminals 1 to 6 can send uplink data to the base station.
  • the base station receives uplink data sent by the terminals 1 to 6.
  • the terminals 4 to 6 may constitute a sub communication system.
  • the BS can send downlink information to terminal 1, terminal 2, terminal 5, and so on.
  • the terminal 5 may also send downlink information to the terminal 4 and the terminal 6.
  • the base station may be a common base station (such as a Node B or an eNB), a new radio controller (NR controller), a gNodeB (gNB) in a 5G system, a centralized network unit (centralized unit), or a new radio A base station, a radio remote module, a micro base station, a distributed network unit, a transmission reception point (TRP) or a transmission point (TP), or any other wireless access device. Examples of this application Not limited to this.
  • the terminal may be a device having a communication function with a base station and a relay node, or may be a device that provides voice and / or data connectivity to a user.
  • the terminal may be a handheld device, a vehicle-mounted device, etc. having a wireless connection function.
  • Common terminals include, for example, mobile phones, tablet computers, notebook computers, handheld computers, mobile Internet devices (MID), and wearable devices, such as smart watches, smart bracelets, pedometers, and the like.
  • the terminal may also be referred to as a user equipment (UE).
  • UE user equipment
  • the base station dynamically instructs the terminal to perform the HARQ feedback time through downlink control information (DCI) or semi-static radio resource control (RRC) layer configuration signaling. That is, the base station will notify the terminal when to perform HARQ feedback.
  • DCI downlink control information
  • RRC radio resource control
  • the terminal if the terminal receives dynamically or semi-statically scheduled downlink data (or Physical Downlink Shared Channel (PDSCH)) in slot n, the terminal needs to download the downlink data in slot (n + k) Perform HARQ feedback.
  • the value of k may be indicated by the PDSCH-to-HARQ_feedback timing indicator in the DCI, or determined according to the dl-DataToUL-ACK field included in higher-layer signaling (such as RRC signaling).
  • the time relationship between downlink data transmission and the corresponding HARQ feedback can be determined by the value of k described above.
  • the terminal when using the unlicensed frequency band for communication, due to the uncertainty of LBT, the terminal cannot perform HARQ feedback according to a specified time relationship (for example, k), thereby affecting system performance.
  • FIG. 2 provides a HARQ feedback method according to an embodiment of the present application.
  • the base station sends downlink data, it needs to notify the terminal how to perform HARQ feedback on the downlink data.
  • the base station instructs the terminal on how to perform HARQ feedback, it needs to send two (in some scenarios, more than two) indication information successively.
  • This method may be called two-step scheduling. Therefore, this HARQ feedback method can be called HARQ feedback based on two-step scheduling.
  • the method includes the following steps.
  • Step 201 The base station sends the first indication information.
  • Step 202 The base station sends the second instruction information.
  • Step 203 The base station receives the HARQ feedback information of the terminal.
  • the first indication information is used to indicate that the terminal needs to perform HARQ feedback on corresponding downlink data transmission.
  • the second indication information is used to indicate when the terminal performs HARQ feedback.
  • the first instruction information is used to instruct the terminal to perform HARQ feedback, or is used to instruct the terminal to receive the second instruction information, or is used to trigger the terminal to perform HARQ feedback, or is used to trigger the terminal to receive the second instruction information, or , Used to indicate the type of HARQ feedback in an unlicensed spectrum communication scenario.
  • the second indication information includes second time information for instructing the terminal to perform HARQ feedback. Further, the first indication information or the second indication information may be sent to the terminal through DCI.
  • the base station sends the first indication information within the first channel occupation time COT, and sends the second indication information within the second COT.
  • the base station performs LBT after sending the first indication information.
  • the base station sends the second indication information after obtaining the channel through competition.
  • the terminal can access the channel through the CAT2 method (wherein the CAT2 method can also be called type2 channel access procedure, that is, the terminal can access the channel after the listening channel has 25us idle) .
  • the CAT2 method has a higher probability of accessing the channel.
  • the HARQ feedback of the two-step scheduling can shorten the scheduling delay compared to directly performing the HARQ feedback based on the LBT results, so that the probability of losing a channel will also be reduced. By indicating the HARQ feedback in a two-step scheduling manner, the terminal channel access probability can be improved, and further, the transmission of HARQ feedback can be effectively guaranteed.
  • the first indication information is used to indicate that the terminal needs to perform HARQ feedback on corresponding downlink data transmission.
  • the second indication information is used to indicate when the terminal performs HARQ feedback.
  • the first indication information may be called trigger signaling A (trigger A).
  • the second indication information may be called trigger signaling B (trigger B).
  • the first instruction information may be terminal-specific instruction information. That is, the first instruction information may be sent to a specific terminal.
  • the second instruction information may be terminal-specific instruction information.
  • the second indication information may be public indication information, that is, the second indication information may be sent to multiple terminals or all terminals in a certain group or all terminals in a certain cell. It should be understood that when the terminal receives the first instruction information, it can learn that the HARQ feedback corresponding to the corresponding downlink data transmission is HARQ feedback based on two-step scheduling. Therefore, the terminal also needs to receive the second instruction information.
  • the first indication information may be indicated by 1 bit.
  • a 1-bit field may be added to the downlink control information to carry the first indication information.
  • a 1-bit field may be added to the DCI format 1_0 / DCI format 1_1 in the NR system to carry the first instruction information.
  • the first indication information may be indicated by multiplexing certain fields in the downlink control information. For example, when some fields in the DCI are preset values, they may be used as the first indication information.
  • the DCI format 1_0 / DCI format 1_1 in the NR system includes a field "PDSCH-to-HARQ_feedback timing indicator".
  • the field When the field is configured to a specific value, such as "000", the field may be used as the first indication information. That is, use this field to notify the terminal that HARQ feedback is required for downlink data transmission, or to notify the terminal that it needs to receive second instruction information.
  • the first indication information may also be indicated in an implicit manner.
  • the downlink scheduling information when the downlink scheduling information is located within a specific time range, the downlink scheduling information may be used as the first indication information.
  • the downlink scheduling information when the downlink scheduling information is located in the last time slot of a COT or in the middle or tail of a COT, the downlink scheduling information may be used as the first indication information.
  • the terminal After the terminal receives the downlink scheduling information within a specific time range, it is equivalent to receiving the first instruction information.
  • the terminal can know that it needs to perform HARQ feedback, or notify the terminal that it needs to receive the second instruction information
  • the first indication information may also indicate how many downlink data transmissions the terminal needs to perform HARQ feedback.
  • the terminal may need to perform HARQ feedback on multiple previous downlink data transmissions.
  • the terminal may also need to perform HARQ feedback on multiple previous downlink data transmissions.
  • the first indication information may be used to indicate the number of bits for which HARQ feedback is required. The number of bits is HARQ feedback for a corresponding number of downlink data transmissions.
  • the first indication information may need to be indicated by multiple bits. For example, multiple bits are added or multiple fields in the downlink control information are multiplexed to carry the first indication information.
  • the first indication information may also indicate which downlink data transmission the terminal needs to perform HARQ feedback.
  • the HARQ process information corresponding to the one or more downlink data transmissions that require HARQ feedback may be indicated in an explicit or implicit manner.
  • the terminal may be instructed to perform HARQ feedback on one or more downlink data transmissions corresponding to the one or more HARQ process ID / number by notifying the terminal of one or more HARQ process ID / number.
  • the one or more HARQ process IDs / numbers may be explicitly carried in the first indication information.
  • the one or more HARQ process IDs / numbers may be indicated in a bitmap manner.
  • Each bit in the bitmap corresponds to the HARQ process ID / number (you can also consider that each bit in the bitmap indicates a HARQ process).
  • the bit is a first value (for example, "1"), it indicates that the downlink data transmission corresponding to the HARQ process indicated by the bit requires HARQ feedback.
  • the bit is a second value (for example, "0"), it means that the downlink data transmission corresponding to the HARQ process indicated by the bit does not need to perform HARQ feedback.
  • the HARQ process can also be grouped. Use the first indication information to indicate packet information of the HARQ process corresponding to the one or more downlink data transmissions that need to be HARQ feedback. This can save signaling overhead.
  • the HARQ process ID and other information can also be jointly encoded to further save signaling overhead.
  • the first instruction information further includes first time information that instructs the terminal to perform HARQ feedback.
  • first time information may be an offset of a resource on which the terminal performs HARQ feedback with respect to a start position of the multiple resources.
  • the first time information may be carried by adding a field in the DCI, or may be indicated by multiplexing some fields in the existing DCI.
  • the DCI format 1_0 / DCI format 1_1 in the NR system contains a field "PDSCH-to-HARQ_feedback timing indicator".
  • the newly added 1 bit is used to instruct the terminal to perform HARQ feedback (for example, HARQ feedback based on two-step scheduling).
  • the bits in the field "PDSCH-to-HARQ_feedback timing" can be used for the first time information. Or, use the first bit in this field to instruct the terminal to perform HARQ feedback.
  • the remaining bits of this field indicate the first time information.
  • the first indication information may be sent together with the downlink scheduling information, or may be sent separately. That is, the first indication information may be separate control information, or may be carried in the existing DCI.
  • the resource allocation field in DCI For the method carried in DCI, if the base station only needs to instruct the terminal to perform HARQ feedback, and there is no downlink data, it can be achieved by setting the resource allocation field in DCI to zero.
  • the field "Frequency domain domain resource" included in the DCI format 1_0 / DCI format 1_1 in the NR system is set to zero, indicating that there is no downlink data transmission. At this time, setting the field to zero may also indicate the first indication information. That is, this field is used to notify the terminal that HARQ feedback is required for downlink data transmission.
  • the terminal receives the first instruction information.
  • the terminal can know that it needs to perform HARQ feedback (for example, HARQ feedback based on two-step scheduling). Therefore, the terminal waits to receive the second instruction information to further obtain the second time information for performing HARQ feedback.
  • the second time information may be one or more of a time offset of the time of HARQ feedback of the terminal with respect to receiving the second indication information, or a time length (or time resource) that can be used for HARQ feedback.
  • the time offset may be a time offset common to multiple terminals.
  • the second indication information may be information (for example, terminal-specific information) for a certain terminal.
  • the second instruction information is public control information.
  • the second indication information may be carried in a common physical downlink control channel (common-physical downlink control channel (C-PDCCH)), or a group common physical downlink control channel (group common-physical downlink control channel (GC-PDCCH)). transmission.
  • C-PDCCH common-physical downlink control channel
  • GC-PDCCH group common-physical downlink control channel
  • the second indication information needs to indicate when the terminal performs HARQ feedback. That is, the second indication information includes second time information of HARQ feedback.
  • the second time information may be a time offset of the HARQ feedback time of the terminal relative to the second instruction information received by the terminal, or the second time information is an absolute time of the HARQ feedback of the terminal.
  • the second indication information may also indicate how much downlink data transmission of the terminal requires HARQ feedback. That is, the second indication information may be used to indicate the number of bits for which HARQ feedback is required. Alternatively, the second indication information may also be updated with respect to the number of HARQ bits that the terminal needs to indicate in the first indication information and / or other scheduling information (for example, the Downlink Assignment Index (DAI) field in the DCI). .
  • DAI Downlink Assignment Index
  • the second indication information also carries information of resources available for HARQ feedback.
  • the second indication information includes information for allocating one or more HARQ feedback resources to the terminal.
  • the second indication information may include information of multiple HARQ feedback resources allocated to multiple terminals. Wherein, each terminal of the multiple terminals is allocated one or more HARQ feedback resources.
  • the HARQ feedback resource in the embodiment of the present application may be a time resource. For example, the time unit in FIG. 3 or FIG. 4.
  • the second indication information may further indicate which downlink data transmission the terminal needs to perform HARQ feedback (it should be understood that a refresh instruction may be performed for the indication in the first indication information).
  • the HARQ process information (HARQ process) corresponding to the one or more downlink data transmissions requiring HARQ feedback may be indicated in an explicit or implicit manner.
  • the terminal may be instructed to perform HARQ feedback on one or more downlink data transmissions corresponding to the one or more HARQ process ID / number by notifying the terminal of one or more HARQ process ID / number.
  • the one or more HARQ process IDs / numbers may be explicitly carried in the first indication information.
  • the one or more HARQ process IDs / numbers may be indicated in a bitmap manner.
  • Each bit in the bitmap corresponds to the HARQ process ID / number (you can also consider that each bit in the bitmap indicates a HARQ process).
  • the bit is a first value (for example, "1"), it indicates that the downlink data transmission corresponding to the HARQ process indicated by the bit requires HARQ feedback.
  • the bit is a second value (for example, "0"), it means that the downlink data transmission corresponding to the HARQ process indicated by the bit does not need to perform HARQ feedback.
  • the HARQ process can also be grouped.
  • the first indication information to indicate packet information of the HARQ process corresponding to the one or more downlink data transmissions that need to be HARQ feedback. This can save signaling overhead.
  • the HARQ process ID and other information can also be jointly encoded to further save signaling overhead.
  • the second indication information may be sent together with the downlink scheduling information, or may be sent separately. That is, the second indication information may be a separate control information, or may be carried in the existing DCI.
  • the base station if the base station only needs to instruct the terminal when to perform HARQ feedback, and there is no downlink data, it can be achieved by setting the field of resource allocation in DCI to zero.
  • the field "Frequency domain domain resource" included in the DCI format 1_0 / DCI format 1_1 in the NR system is set to zero, indicating that there is no downlink data transmission. Further, setting this field to another specific value may also indicate the second indication information. That is, this field is used to notify the terminal when to perform HARQ feedback on downlink data transmission.
  • a time offset between the base station sending the first instruction information and sending the second instruction information needs to satisfy a certain condition.
  • the time offset is not greater than a preset duration.
  • the preset duration may be carried in the first instruction information.
  • the terminal learns that HARQ feedback needs to be performed on downlink data transmission. Therefore, the terminal may need to wait to receive the second instruction information. If the format of the DCI carrying the second instruction information is different from the format of the DCI carrying the first instruction information, the terminal instructs to perform the blind inspection of the second instruction information within a preset duration, and the terminal may not perform the blind inspection beyond the preset duration. This can save overhead.
  • the base station may not send information of a preset duration.
  • the terminal acquires the second time information instructed by the base station to perform HARQ feedback.
  • the terminal waits to receive the second instruction information within the preset duration.
  • the terminal no longer waits to receive the second instruction information.
  • the terminal may obtain the time information of the HARQ that is actually fed back.
  • the time offset between the time when the terminal actually sends the HARQ feedback and the second instruction information of the terminal is equal to the sum of the time offset indicated by the first time information and the time offset indicated by the second time information. That is, the terminal may perform HARQ feedback on HARQ feedback resources determined according to the first indication information and the second indication information.
  • the field (or control signaling) used to carry the first indication information is also used to indicate whether the terminal performs HARQ feedback based on the two-step scheduling method. That is, the control signaling (or field) can take at least two values. The first value indicates that the field carries the first indication information, or the field instructs the terminal to perform HARQ feedback based on the two-step scheduling method. The second value indicates that this field indicates that the terminal does not perform HARQ feedback based on the two-step scheduling.
  • whether the terminal performs HARQ feedback based on the two-step scheduling can be performed by multiplexing one or more fields in the existing downlink control information.
  • the DCI format 1_0 / DCI format 1_1 in the NR system includes a field "PDSCH-to-HARQ_feedback timing indicator". Group all possible values of the field "PDSCH-to-HARQ_feedback timingindicator", for example, group A and group B. If the value of this field is in group A, it means that the DCI includes first indication information, that is, the terminal is instructed to perform HARQ feedback on downlink data transmission.
  • this field is in group B, it means that the DCI does not include the first indication information, that is, the terminal is instructed not to perform HARQ feedback on downlink data transmission or to perform HARQ feedback based on two-step scheduling.
  • the actual value of this field may be used to indicate the preset duration or the first time information in the first indication information.
  • One or more of the valid window and HARQ feedback time information may be used to indicate the preset duration or the first time information in the first indication information.
  • control signaling for carrying the first indication information or the second indication information may further include identification information, and the identification information is used to indicate whether the signaling carries the first indication information or the second indication information. Specifically, when the identification information takes a first value, it indicates that the control information carries first indication information. When the identification information takes a second value, it indicates that the control information carries second instruction information.
  • the identification information may be part of the first indication information or the second indication information.
  • the HARQ feedback method provided in this embodiment is further described below with reference to FIGS. 3 to 6.
  • FIG. 3 is a timing diagram of HARQ feedback.
  • HARQ feedback may be performed in a two-step scheduling manner.
  • the base station obtains a channel usage right through a channel access mechanism based on random backoff.
  • the base station sends the first instruction information to notify the terminal that HARQ feedback is required for corresponding downlink data transmission.
  • the base station obtains a new channel usage right, that is, after obtaining the second COT, within the second COT, it sends second instruction information to instruct the terminal when to perform HARQ feedback.
  • the base station and the terminal can also perform HARQ feedback based on two-step scheduling in one COT. That is to say, the HARQ feedback mode based on two-step scheduling does not limit whether it is completed in one COT, and the implementation manner can be obtained by referring to the related embodiment (for example, the embodiment shown in FIG. 4) of this application.
  • the terminal When the terminal receives the first instruction information at the time unit n-p, the terminal needs to wait to receive the second instruction information.
  • the terminal receives the second instruction information at the time unit n, and the second instruction information carries the information of the time offset 2.
  • the time offset 2 is the second time information. The terminal can learn that it can enter HARQ feedback in a number of time units corresponding to a time offset of 2 relative to the time unit n.
  • the second indication information shown in FIG. 3 is directed to a specific terminal. Therefore, the terminal only needs to know the second time information to know the time for performing HARQ feedback, and the first time information is no longer required. That is, after the terminal obtains the time offset 2, it obtains a time resource for performing HARQ feedback. The terminal performs HARQ feedback on the resource.
  • FIG. 4 is a timing diagram of another HARQ feedback.
  • the base station sends the first indication information at the time unit n-p to notify the terminal that HARQ feedback is required for downlink data transmission.
  • the base station sends the second indication information at the time unit n, to indicate when the terminal performs HARQ feedback.
  • the first indication information may further carry information of a preset duration. When the time that the terminal waits to receive the second instruction information exceeds a preset duration, the terminal no longer continues to wait. For example, if the p time units shown in FIG. 4 exceed a preset duration, the terminal will not receive the second indication information at the time unit n.
  • the second indication information carries a time offset 2 (that is, second time information).
  • the second indication information also carries information of resources available for HARQ feedback.
  • the second indication information may be common control information, and both the time offset 2 and resources available for HARQ feedback are directed to multiple terminals.
  • the base station may allocate one or more HARQ feedback resources to each of the multiple terminals. For a certain terminal, more information is needed to determine the resources for the terminal to perform HARQ feedback. Therefore, the first indication information also carries a time offset of 1.
  • the time offset 1 indicates the offset of the resource for HARQ feedback of the terminal relative to the start position of the entire resource available for HARQ feedback. Therefore, the terminal can perform HARQ feedback on the (n + time offset 1 + time offset 2) time unit. If the base station allocates m HARQ feedback resources to the terminal, the terminal may perform the (n + time offset 1 + time offset 2) th to (n + time offset 1 + time offset 2 + m) -1) HARQ feedback on time units.
  • the second indication information shown in FIG. 4 is public or group public. Therefore, the terminal receiving the second instruction information needs to know the first time information in addition to the second time information. In this way, it is possible to know when the terminal actually performs HARQ feedback.
  • the situation shown in FIG. 3 does not require the first time information.
  • the metric of the first time information or the second time information, and the time unit mentioned in the related description of FIG. 3 or FIG. 4 may be a symbol, a mini-slot, or a slot. , Subframes, frames, etc., or microseconds (us), milliseconds (ms), seconds (s), minutes (min), etc. There is no limitation on this application.
  • the first time information or the second time information is based on symbols, mini time slots, time slots, subframes, frames, etc.
  • the first time information or the second The time information also needs to include reference numerology information, such as information on the subcarrier interval.
  • the reference numerology information may also be predefined.
  • FIG. 5 is a schematic structural diagram of a first indication information.
  • the first indication information may have the same or similar structure in the downlink control information.
  • the first indication information includes a field 1.
  • Field 1 carries trigger information or identification information.
  • the trigger information can be used to trigger the terminal to perform HARQ feedback.
  • the identification information may be used to identify the first instruction information or used to identify that the downlink control information includes the first instruction information.
  • the first indication information further includes one or more of a field 2 carrying preset duration information, a field 3 carrying first time information, a field 4 carrying HARQ information, and a field 5 carrying HARQ feedback bits.
  • the field 5 carrying the number of HARQ feedback bits may be a DAI field or an extended DAI field.
  • field 1 and other fields in the first indication information may be encoded in a joint encoding manner, and then transmitted.
  • the order of the fields in the first indication information can be arbitrarily changed, and the fields can be discontinuous (such as inserting other fields), which is not limited in this application.
  • FIG. 6 is a schematic structural diagram of a second indication information.
  • the second instruction information may have the same or similar structure in the downlink control information.
  • the second indication information includes a field 1.
  • Field 1 carries trigger information or identification information.
  • the trigger information may be used to trigger the terminal to perform HARQ feedback according to the second time information.
  • the identification information may be used to identify the second instruction information or used to identify that the downlink control information includes the second instruction information.
  • the second indication information further includes one or more of a field 2 carrying the first time information, a field 3 carrying HARQ information, and a field 4 carrying the number of HARQ feedback bits.
  • the field 4 carrying the number of HARQ feedback bits may be a DAI field or an extended DAI field.
  • field 1 and other fields in the second indication information may be encoded in a joint encoding manner, and then transmitted.
  • the order of the fields in the second indication information can be arbitrarily changed, and the fields can be discontinuous (such as inserting other fields), which is not limited in this application.
  • an embodiment of the present application further provides a communication device.
  • the base station may be used to execute the method performed by the base station or the terminal in the foregoing method embodiments.
  • FIG. 7 shows a schematic diagram of a possible structure of a communication device involved in the foregoing method embodiment.
  • the communication device 700 may include a receiving unit 710 and a transmitting unit 720.
  • the communication device 700 may be a base station or a chip or a terminal configured in the base station or a chip configured and a terminal.
  • the sending unit 720 is configured to send the first indication information, the first indication information is used to instruct the terminal to perform HARQ feedback; and the second indication information is used to send the second indication information.
  • the second time information of the terminal performing HARQ feedback is described; the receiving unit 710 is configured to receive the HARQ feedback information of the terminal.
  • the receiving unit 710 is configured to receive first indication information, the first indication information is used to instruct the terminal to perform HARQ feedback; and the second indication information is used to receive the second indication information.
  • the communication device 700 may further include a processing unit 730, which is configured to process the received information and to process the information to be transmitted.
  • the communication device 700 may be used to execute the method performed by the base station or terminal in the foregoing method embodiments.
  • the communication device 700 may be used to execute the method performed by the base station or terminal in the foregoing method embodiments.
  • implementation manners and technical effects that are not described in detail in the communication device 700 refer to the related description of the foregoing method embodiments.
  • an embodiment of the present application further provides a base station.
  • the base station may be configured to execute the method performed by the base station in the foregoing method embodiment.
  • the base station may include a transceiver 801.
  • the transceiver 801 may further include a receiver and a transmitter.
  • the transmitter is configured to send first indication information, the first indication information is used to instruct the terminal to perform HARQ feedback, and the second instruction information is used to send the second indication information, and the second indication information includes a second time used to instruct the terminal to perform HARQ feedback.
  • Information; the receiver is used to receive HARQ feedback information from the terminal.
  • the transceiver 801 may be integrated by a transmitter and a receiver. In other embodiments, the transmitter and the receiver may be independent of each other.
  • the base station may further include a processor 802, a memory 803, and a communication unit 804.
  • the transceiver 801, the processor 802, the memory 803, and the communication unit 804 are connected through a bus.
  • the data (for example, PDSCH) or signaling (for example, PDCCH) to be transmitted is adjusted by the transceiver 801 to generate an output sample and a downlink signal is generated.
  • the downlink signal is transmitted to the foregoing embodiment via an antenna. Terminal.
  • the antenna receives the uplink signal transmitted by the terminal in the above embodiment, and the transceiver 801 adjusts the signal received from the antenna and provides input samples.
  • service data and signaling messages are processed, for example, data to be transmitted is modulated, and SC-FDMA symbol generation is performed.
  • These units process according to the radio access technology (such as LTE, 5G, and other evolved system access technologies) adopted by the radio access network.
  • the processor 802 is further configured to control and manage the base station, so as to execute the processing performed by the base station in the foregoing method embodiment.
  • the processor 802 is configured to process received information and to process information to be transmitted.
  • the processor 802 is configured to support a base station to execute a processing procedure of the base station involved in FIG. 2 to FIG. 6. Applied in an unauthorized scenario, the processor 802 also needs to control the base station to perform channel listening to transmit data or signaling.
  • the processor 802 performs channel monitoring through the signal received by the transceiver 801 from the transceiving device or the antenna, and controls the signal to be transmitted via the antenna to preempt the channel.
  • the processor 802 may include one or more processors, for example, one or more central processing units (CPUs).
  • the processor 802 may be integrated in a chip, or may be the chip itself. .
  • the memory 803 is configured to store related instructions and data, and program codes and data of the base station.
  • the memory 603 includes, but is not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), and Erasable Programmable Read Only Memory (EPROM), or Compact Read-Only Memory (CD-ROM).
  • RAM Random Access Memory
  • ROM Read-Only Memory
  • EPROM Erasable Programmable Read Only Memory
  • CD-ROM Compact Read-Only Memory
  • the memory 803 is independent of the processor 802. In other embodiments, the memory 803 may also be integrated in the processor 802.
  • the base station shown in FIG. 8 may be used to execute the method performed by the base station in the foregoing method embodiment.
  • the base station shown in FIG. 8 may be used to execute the method performed by the base station in the foregoing method embodiment.
  • an embodiment of the present application further provides a base station.
  • the base station may be configured to execute the method performed by the base station in the foregoing method embodiment.
  • the terminal may include a transceiver 901.
  • the transceiver 901 may further include a receiver and a transmitter.
  • the receiver is configured to receive the first instruction information, the first instruction information is used to instruct the terminal to perform HARQ feedback; and the second instruction information is used to receive the second instruction information, and the second instruction information includes second time information used to instruct the terminal to perform HARQ feedback;
  • the transmitter sends HARQ feedback information to the base station.
  • the transceiver 901 may be integrated by a transmitter and a receiver. In other embodiments, the transmitter and receiver may be independent of each other.
  • the terminal may further include a processor 902, a memory 903, and a modem 904.
  • the transceiver 901, the processor 902, the memory 903, and the modem 904 are connected through a bus.
  • the transceiver 901 adjusts (for example, analog conversion, filtering, amplification, up-conversion, etc.) the output samples and generates an uplink signal, which is transmitted to the base station in the above-mentioned embodiment via an antenna.
  • the antenna receives the downlink signal from the base station in the above embodiment.
  • the transceiver 901 conditions (e.g., filters, amplifies, downconverts, and digitizes, etc.) the signals received from the antenna and provides input samples.
  • the encoder 9041 receives service data and signaling messages to be transmitted on the uplink, and processes (e.g., formats, encodes, and interleaves) the service data and signaling messages. .
  • the modulator 9042 further processes (e.g., symbol maps and modulates) the encoded service data and signaling messages and provides the aforementioned output samples.
  • the demodulator 9043 processes (e.g., demodulates) the above input samples and provides symbol estimates.
  • the decoder 9044 processes (e.g., deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages sent to the terminal.
  • the encoder 9041, the modulator 9042, the demodulator 9043, and the decoder 9044 may be implemented by a synthetic modem processor 904. These units process according to the radio access technology (such as LTE, 5G, and other evolved system access technologies) adopted by the radio access network.
  • the radio access technology such as LTE, 5G, and other evolved system access technologies
  • the processor 902 controls and manages the terminal, and is configured to execute processing performed by the terminal in the foregoing method embodiment. For example, it is used to control the terminal for uplink transmission and / or other processes of the technology described in this application. As an example, the processor 902 is configured to support a terminal to execute a processing process related to the terminal in FIG. 2 to FIG. 6. For example, the transceiver 901 is configured to control / receive a downlink transmitted signal through an antenna. In different embodiments, the processor 902 may include one or more processors, such as including one or more CPUs. The processor 902 may be integrated in a chip, or may be the chip itself.
  • the memory 903 is used to store related instructions and data, and program codes and data of the terminal.
  • the memory 903 is independent of the processor 902. In other embodiments, the memory 903 may also be integrated in the processor 902.
  • the terminal shown in FIG. 9 may be used to execute the method performed by the terminal in the foregoing method embodiment.
  • implementation methods and technical effects that are not described in detail in the base station shown in FIG. 9, refer to the method embodiment Related description.
  • FIG. 8 and FIG. 9 only show simplified designs of the base station and the terminal.
  • the base station and terminal may include any number of transmitters, receivers, processors, memories, etc., and all the base stations and terminals that can implement this application are within the protection scope of this application.
  • the communication system includes a base station and a terminal.
  • the base station may be the communication device shown in FIG. 7 or the base station shown in FIG. 8.
  • the terminal may be a communication device shown in FIG. 7 or a terminal shown in FIG. 9.
  • an embodiment of the present application further provides a computer program product.
  • the computer program product includes computer program code.
  • the computer program code runs on a computer, the computer executes the implementation shown in FIG. Example method.
  • an embodiment of the present application further provides a computer-readable medium.
  • the computer-readable interpretation stores program code.
  • the program code runs on a computer, the computer executes the implementation shown in FIG. 2 to FIG. 6. Example method.
  • an embodiment of the present application further provides a chip.
  • the chip may be a processor, and is configured to implement the method in the foregoing method embodiment. Further, the chip is connected to a memory, and is configured to read and execute a software program stored in the memory to implement the methods in the embodiments shown in FIG. 2 to FIG. 6.
  • an embodiment of the present application provides a chip, where the chip includes a processor and a memory, and the processor is configured to read a software program stored in the memory to implement the implementation shown in FIG. 2 to FIG. 6. Example method.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a particular manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions The device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server, or data center Transmission by wire (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) to another website site, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, and the like that includes one or more available medium integration.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

本申请实施例提供了一种HARQ反馈方法，包括：基站发送第一指示信息，所述第一指示信息用于指示终端进行HARQ反馈；所述基站发送第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；所述基站接收所述终端的HARQ反馈信息。可选地，所述基站可以在第一信道占用时间COT内发送所述第一指示信息，以及在第二COT内发送所述第二指示信息。通过两步调度的方式，对HARQ反馈进行指示，可以提高终端信道接入概率，进一步地，还能有效保证HARQ反馈的传输。

Description

一种HARQ反馈方法和装置 技术领域
本申请涉及通信技术领域，尤其涉及一种一种HARQ反馈方法和装置。
背景技术
无线通信技术的飞速发展，导致频谱资源日益紧缺，促进了对于非授权频段的探索。3GPP引入了授权辅助接入(License Assisted Access，LAA)和增强的授权辅助接入(enhanced LAA，eLAA)技术。即在非授权频谱上非独立(Non-standalone)的部署LTE/LTE-A系统，通过授权频谱的辅助来最大化利用非授权频谱资源。
在非授权频谱上部署的通信系统通常采用竞争的方式来使用或共享无线资源。一般地，发送端在发送信号之前首先会监听非授权信道(或非授权频谱)是否空闲。例如，发送端通过在非授权频谱上检测接收信号的功率来判断其忙闲状态。如果接收信号的功率小于一定门限，则认为非授权频谱处于空闲状态。发送端可以在该非授权频谱上发送信号，否则不发送信号。这种先监听后发送的机制被称作先听后发(Listen Before Talk，LBT)。
在进行LBT时，由于信道占用情况的不确定性，导致基站或终端并不总能及时发送信号。此时，对于混合自动重传请求(Hybrid Automatic Repeat reQuest，hybrid ARQ或HARQ)的传输而言，若由于LBT的原因未能及时进行ACK/NACK确认，则会对后续的传输造成影响。
发明内容
本申请实施例提供一种一种HARQ反馈方法和装置，可以有效保证HARQ反馈的传输。
第一方面，本申请实施例提供了一种HARQ反馈方法，包括：基站发送第一指示信息，所述第一指示信息用于指示终端进行HARQ反馈；所述基站发送第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；所述基站接收所述终端的HARQ反馈信息。可选地，所述基站可以在第一信道占用时间(channel occupancy time，COT)内发送所述第一指示信息，以及在第二COT内发送所述第二指示信息。
因为是在基站的信道占用时间内进行HARQ反馈，终端可以通过CAT2方式接入信道。相比于基于随机退避的CAT4方式接入信道而言，CAT2方式接入信道的概率更高。另外一方面，两步调度的HARQ反馈相比于直接根据LBT结果进行HARQ反馈可以缩短调度时延，这样丢失信道的概率也会降低。通过两步调度的方式，对HARQ反馈进行指示，可以提高终端信道接入概率，进一步地，还能有效保证HARQ反馈的传输。
在一种可能的设计中，所述第二时间信息包括进行HARQ反馈的时间相对于第二指示信息的时间偏移量，或者，所述第二时间信息包括进行HARQ反馈的绝对时间。通过通知 终端第二时间信息，终端可以获知进行HARQ反馈的时间。
在一种可能的设计中，所述基站发送所述第一指示信息和发送第二指示信息之间的时间偏移不大于预设时长。其中，所述第一指示信息还包括用于指示所述预设时长的信息。通过通知终端预设时长的信息，可以让终端避免无限制的等待接收第二指示信息，从而节省盲检开销。
在一种可能的设计中，所述第二指示信息还包括为所述终端分配一个或多个HARQ反馈资源的信息。可选地，所述第二指示信息还包括为多个终端分配的多个HARQ反馈资源的信息，其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源，所述多个终端包括所述终端。进一步地，所述第一指示信息还包括第一时间信息，所述第一时间信息包括的第一时间偏移量；所述第一时间信息用于指示所述终端在相对于所述第二指示信息发送时间偏移所述第一时间偏移量和第二时间偏移量的一个或多个HARQ反馈资源上进行HARQ反馈。通过通知终端HARQ反馈资源的信息，终端可以确定的资源上进行HARQ反馈，以保证HARQ反馈的成功率。
第二方面，本申请实施例提供了一种HARQ反馈方法，包括：终端接收第一指示信息，所述第一指示信息用于指示所述终端进行HARQ反馈；所述终端接收第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；所述终端向基站发送HARQ反馈信息。可选地，所述终端在所述基站的第一信道占用时间COT内接收所述第一指示信息，以及在所述基站的第二COT内接收所述第二指示信息。
因为是在基站的信道占用时间内进行HARQ反馈，终端可以通过CAT2方式接入信道。相比于基于随机退避的CAT4方式接入信道而言，CAT2方式接入信道的概率更高。另外一方面，两步调度的HARQ反馈相比于直接根据LBT结果进行HARQ反馈可以缩短调度时延，这样丢失信道的概率也会降低。通过两步调度的方式，对HARQ反馈进行指示，可以提高终端信道接入概率，进一步地，还能有效保证HARQ反馈的传输。
在一种可能的设计中，所述第二时间信息包括进行HARQ反馈的时间相对于第二指示信息的时间偏移量，或者，所述第二时间信息包括进行HARQ反馈的绝对时间。通过通知终端第二时间信息，终端可以获知进行HARQ反馈的时间。
在一种可能的设计中，所述基站发送所述第一指示信息和发送第二指示信息之间的时间偏移不大于预设时长。其中，所述第一指示信息还包括用于指示所述预设时长的信息。通过通知终端预设时长的信息，可以让终端避免无限制的等待接收第二指示信息，从而节省盲检开销。
在一种可能的设计中，所述第二指示信息还包括为所述终端分配一个或多个HARQ反馈资源的信息。可选地，所述第二指示信息还包括为多个终端分配的多个HARQ反馈资源的信息，其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源，所述多个终端包括所述终端。进一步地，所述第一指示信息还包括第一时间信息，所述第一时间信息包括的第一时间偏移量；所述第一时间信息用于指示所述终端在相对于所述第二指示信息发送时间偏移所述第一时间偏移量和第二时间偏移量的一个或多个HARQ反馈资源上进行HARQ反馈。通过通知终端HARQ反馈资源的信息，终端可以确定的资源上进行HARQ反馈，以保证HARQ反馈的成功率。
第三方面，本申请实施例提供了一种基站，包括：发射器和接收器。其中：所述发射器用于发送第一指示信息，所述第一指示信息用于指示终端进行HARQ反馈；以及用于发送第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；所述接收器用于接收所述终端的HARQ反馈信息。基站可以在第一COT发送第一指示信息，以及在第二COT发送第二指示信息。或者基站在发送第一指示信息后，进行LBT操作。
在一种可能的设计中，所述第二时间信息包括进行HARQ反馈的时间相对于第二指示信息的时间偏移量，或者，所述第二时间信息包括进行HARQ反馈的绝对时间。通过通知终端第二时间信息，终端可以获知进行HARQ反馈的时间。
在一种可能的设计中，所述基站发送所述第一指示信息和发送第二指示信息之间的时间偏移不大于预设时长。其中，所述第一指示信息还包括用于指示所述预设时长的信息。通过通知终端预设时长的信息，可以让终端避免无限制的等待接收第二指示信息，从而节省盲检开销。
在一种可能的设计中，所述第二指示信息还包括为所述终端分配一个或多个HARQ反馈资源的信息。可选地，所述第二指示信息还包括为多个终端分配的多个HARQ反馈资源的信息，其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源，所述多个终端包括所述终端。进一步地，所述第一指示信息还包括第一时间信息，所述第一时间信息包括的第一时间偏移量；所述第一时间信息用于指示所述终端在相对于所述第二指示信息发送时间偏移所述第一时间偏移量和第二时间偏移量的一个或多个HARQ反馈资源上进行HARQ反馈。通过通知终端HARQ反馈资源的信息，终端可以确定的资源上进行HARQ反馈，以保证HARQ反馈的成功率。
第四方面，本申请实施例提供了一种终端，包括：发射器和接收器。所述接收器用于接收第一指示信息，所述第一指示信息用于指示所述终端进行HARQ反馈；以及用于接收第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；所述发射器向基站发送HARQ反馈信息。
在一种可能的设计中，所述第二时间信息包括进行HARQ反馈的时间相对于第二指示信息的时间偏移量，或者，所述第二时间信息包括进行HARQ反馈的绝对时间。通过通知终端第二时间信息，终端可以获知进行HARQ反馈的时间。
在一种可能的设计中，所述基站发送所述第一指示信息和发送第二指示信息之间的时间偏移不大于预设时长。其中，所述第一指示信息还包括用于指示所述预设时长的信息。通过通知终端预设时长的信息，可以让终端避免无限制的等待接收第二指示信息，从而节省盲检开销。
在一种可能的设计中，所述第二指示信息还包括为所述终端分配一个或多个HARQ反馈资源的信息。可选地，所述第二指示信息还包括为多个终端分配的多个HARQ反馈资源的信息，其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源，所述多个终端包括所述终端。进一步地，所述第一指示信息还包括第一时间信息，所述第一时间信息包括的第一时间偏移量；所述第一时间信息用于指示所述终端在相对于所述第二指示信息发送时间偏移所述第一时间偏移量和第二时间偏移量的一个或多个HARQ反馈资源上进 行HARQ反馈。通过通知终端HARQ反馈资源的信息，终端可以确定的资源上进行HARQ反馈，以保证HARQ反馈的成功率。
第五方面，本申请实施例提供了一种通信系统，包括：基站和终端。其中，所述基站为第三方面所述的基站；所述终端为第四方面所述的终端。
第六方面，本申请实施例提供了一种芯片，所述芯片与存储器相连，用于读取并执行所述存储器中存储的软件程序，以实现第一方面至第二方面中任一方面或任一方面的任意一种设计提供的方法。
第七方面，本申请实施例提供了一种芯片，所述芯片包含处理器和存储器，所述处理器用于读取所述存储器中存储的软件程序，以实现第一方面至第二方面中任一方面或任一方面的任意一种设计提供的方法。
第八方面，本申请实施例还提供了一种计算机可读存储介质，用于存储为执行上述第一方面至第三方面中任一方面或任一方面的任意一种设计的功能所用的计算机软件指令，其包含用于执行上述第一方面至第二方面中任一方面或任一方面的任意一种设计所设计的程序。
第九方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面或上述第一方面至第二方面中任一方面或任一方面的任意一种设计所述的方法。
附图说明
图1为一种通信系统；
图2为本申请实施例提供一种HARQ反馈方法；
图3为一种HARQ反馈的时序示意图；
图4为另一种HARQ反馈的时序示意图；
图5为一种第一指示信息的结构示意图；
图6为一种第二指示信息的结构示意图；
图7本申请实施例提供的一种通信装置的结构示意图；
图8本申请实施例提供的一种基站的结构示意图；
图9本申请实施例提供的一种终端的结构示意图。
具体实施方式
本申请实施例可以应用于5G系统，也可以应用于其它的通信系统。只要通信系统中存在实体需要发送数据，以及进行HARQ反馈，都可以应用本申请实施例提供的方法。具体地，通信系统包括但不限于长期演进(long term evolution，LTE)系统，长期演进高级(long term evolution-advanced，LTE-A)系统，新无线(new radio，NR)系统、5G(5 thgeneration)系统等通信系统，也可以扩展到如无线保真(wireless fidelity，WiFi)系统、全球微波互联接入(worldwide interoperability for microwave access，wimax)系统等系统。
图1为一种通信系统。如图1所示，基站(Base station，BS)和终端1～终端6组 成一个通信系统。在该通信系统中，终端1～终端6可以发送上行数据给基站。基站接收终端1～终端6发送的上行数据。此外，终端4～终端6也可以组成一个子通信系统。在该通信系统中，BS可以发送下行信息给终端1、终端2、终端5等。终端5也可以发送下行信息给终端4、终端6。
其中，基站可以是普通的基站(如Node B或eNB)、新无线控制器(new radio controller，NR controller)、5G系统中的gNode B(gNB)、集中式网元(centralized unit)、新无线基站、射频拉远模块、微基站、分布式网元(distributed unit)、传输接收点(transmission reception point，TRP)或传输点(transmission point，TP)或者任何其它无线接入设备，本申请实施例不限于此。
终端可以是具有与基站和中继节点通信功能的设备，也可以是一种向用户提供语音和/或数据连通性的设备。例如，终端可以是具有无线连接功能的手持式设备、车载设备等。常见的终端例如包括：手机、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，例如智能手表、智能手环、计步器等。终端也可以称为用户设备(user equipment，UE)。
在下行传输时，基站会动态地通过下行控制信息(downlink control information，DCI)或者半静态的通过无线资源控制(Radio Resource Control，RRC)层配置信令指示终端进行HARQ反馈的时间。即，基站会通知终端在何时进行HARQ反馈。
具体地，如果终端在时隙n收到动态或半静态调度的下行数据(或者物理下行共享信道(Physical Downlink Shared Channel，PDSCH))，则终端需要在时隙(n+k)对该下行数据进行HARQ反馈。其中，k的值可以由DCI中的PDSCH-to-HARQ_feedback timing indicator字段进行指示，或者根据高层信令(如RRC信令)中所包含的dl-DataToUL-ACK字段来确定。
在5G系统中，下行数据传输和与之相对应的HARQ反馈之间的时间关系可以由上述k的值确定。然而在利用非授权频段进行通信时，由于LBT的不确定性，终端无法按照指定的时间关系(例如k)进行HARQ反馈，从而影响系统性能。
图2为本申请实施例提供一种HARQ反馈方法。基于该方法，基站在发送下行数据时，需要通知终端如何对所述下行数据进行HARQ反馈。具体地，基站在指示终端如何进行HARQ反馈时，需要先后发送两个(某些场景下，需要发送两个以上)指示信息，这种方式可以称为两步调度。因此，这个HARQ反馈的方式可以称为基于两步调度的HARQ反馈。该方法包括如下几个步骤。
步骤201：基站发送第一指示信息。
步骤202：基站发送第二指示信息。
步骤203：基站接收终端的HARQ反馈信息。
其中，第一指示信息用于指示终端需要对相应的下行数据传输进行HARQ反馈。第二指示信息用于指示终端在什么时间进行HARQ反馈。具体地，第一指示信息用于指示终端进行HARQ反馈，或，用于指示终端接收第二指示信息，或，用于触发终端进行HARQ反馈，或，用于触发终端接收第二指示信息，或，用于指示非授权频谱通信场景下的HARQ反馈的类型。第二指示信息包括用于指示终端进行HARQ反馈的第二时间信息。进一步地，第 一指示信息或第二指示信息可以通过DCI发送给终端。
在一种可能的实现方式中，基站在第一信道占用时间COT内发送第一指示信息，在第二COT内发送第二指示信息。在另一种可能的实现方式中，基站在发送第一指示信息后，进行LBT。基站在竞争获得信道后，发送第二指示信息。
因为是在基站的信道占用时间内进行HARQ反馈，终端可以通过CAT2方式接入信道(其中，CAT2方式也可称为type2 channel access procedure，即终端在侦听信道有25us空闲后可以接入信道)。相比于基于随机退避的CAT4方式接入信道(其中，CAT4方式也被称为type1 channel access procedure)而言，CAT2方式接入信道的概率更高。另外一方面，两步调度的HARQ反馈相比于直接根据LBT结果进行HARQ反馈可以缩短调度时延，这样丢失信道的概率也会降低。通过两步调度的方式，对HARQ反馈进行指示，可以提高终端信道接入概率，进一步地，还能有效保证HARQ反馈的传输。
下面对图2所示方法的相关特征进行详细描述。
其中，第一指示信息用于指示终端需要对相应的下行数据传输进行HARQ反馈。第二指示信息用于指示终端在什么时间进行HARQ反馈。第一指示信息可以被称作触发信令A(trigger A)。第二指示信息可以被称作触发信令B(trigger B)。第一指示信息可以为终端specific的指示信息。即，第一指示信息可以是发送给特定终端的。第二指示信息可以为终端specific的指示信息。或第二指示信息可以为公共的指示信息，也即第二指示信息可以是发送给多个终端或某个组内所有终端或某个小区内所有终端的。应理解，终端在收到第一指示信息时，即可获知相应的下行数据传输所对应的HARQ反馈为基于两步调度的HARQ反馈。因此，终端还需要接收第二指示信息。
在一种可能的实现方式中，第一指示信息可以通过1比特(bit)进行指示。例如，可在下行控制信息新增1bit的字段以携带第一指示信息。具体地，可在NR系统中的DCI format 1_0/DCI format 1_1中新增1bit的字段，以携带第一指示信息。在另一种可能的实现方式中，第一指示信息，可以通过复用下行控制信息中的某些字段来进行指示。例如，当DCI中的某些字段为预设的取值时，可以作为所述第一指示信息。具体地，NR系统中的DCI format 1_0/DCI format 1_1中包含字段“PDSCH-to-HARQ_feedback timing indicator”。当该字段被配置为某一特定值时，如“000”时，该字段可以作为所述第一指示信息。即用该字段通知终端需要对下行数据传输进行HARQ反馈，或通知终端需要接收第二指示信息
可选的，第一指示信息还可以通过隐式的方式进行指示。例如，当下行调度信息位于特定的时间范围内时，则该下行调度信息可以作为所述第一指示信息。具体地，当下行调度信息位于某个COT的最后一个时隙或位于某个COT的中部或尾部时，则该下行调度信息可以作为所述第一指示信息。此时终端在特定的时间范围内收到所述下行调度信息后，即相当于接收到第一指示信息。终端即可获知其需要进行HARQ反馈，或通知终端需要接收第二指示信息
进一步地，第一指示信息中还可以指示终端有多少下行数据传输需要进行HARQ反馈。在上下行时隙非对称的场景中，终端可能需要对之前多个下行数据传输进行HARQ反馈。另外，在存在HARQ反馈失败的场景中，终端也可能需要对之前多个下行数据传输进行HARQ反馈。针对一个下行数据传输进行HARQ反馈时至少需要一个比特来指示ACK或NACK。因 此，可以用第一指示信息指示需要进行HARQ反馈的比特数。该比特数即为对相应数量个下行数据传输进行HARQ反馈。此时，第一指示信息可能需要通过多个比特来指示。例如，新增多个比特或复用下行控制信息中的多个字段来携带第一指示信息。
进一步地，第一指示信息中还可以指示终端对哪些下行数据传输需要进行HARQ反馈。例如，可通过显式或隐式的方式指示所述需要进行HARQ反馈的一个或多个下行数据传输对应的HARQ进程(HARQ process)信息。可选的，可以通过通知终端一个或多个HARQ process ID/number的方式指示终端对与该一个或多个HARQ process ID/number对应的一个或多个下行数据传输进行HARQ反馈。具体地，可以明示地将该一个或多个HARQ process ID/number携带在第一指示信息中。或者，可以通过位图(bitmap)的方式指示该一个或多个HARQ process ID/number。位图中的每一个比特位对应HARQ process ID/number(也可以认为位图中的每一个比特位指示了一个HARQ进程)。一种可能的实现方式，若该比特位为第一值(例如“1”)，则表示该比特位所指示的HARQ进程所对应的下行数据传输需要进行HARQ反馈。若该比特位为第二值(例如“0”)，则表示该比特位所指示的HARQ进程所对应的下行数据传输不需要进行HARQ反馈。进一步地，还可以对HARQ进程进行分组。利用第一指示信息指示所述需要进行HARQ反馈的一个或多个下行数据传输对应的HARQ进程的分组信息。这样可以节约信令开销。或者，还可以对HARQ process ID和其他信息(如时间信息)进行联合编码，以进一步节约信令开销。
进一步地，第一指示信息还包括指示终端进行HARQ反馈的第一时间信息。在基站为多个终端分配的多个资源进行HARQ反馈的场景中，对于某一确定的终端而已，基站需要通知该终端多个资源中的哪个资源可以供其进行HARQ反馈。因此，基站通过第一时间信息完成该通知。例如，第一时间信息可以是该终端进行HARQ反馈的资源相对于该多个资源的起始位置的偏移量。可以通过在DCI中新增字段来携带第一时间信息，或者，可以通过复用现有DCI中的某些字段来进行指示。例如，NR系统中的DCI format 1_0/DCI format 1_1中包含字段“PDSCH-to-HARQ_feedback timing indicator”。利用新增的1比特指示终端进行HARQ反馈(例如基于两步调度的HARQ反馈)。字段“PDSCH-to-HARQ_feedback timing indicator”中的比特可以用于第一时间信息。或者，用该字段中的第一个比特指示终端进行HARQ反馈。用该字段的剩余比特指示第一时间信息。
在一种可能的实现方式中，第一指示信息可以与下行调度信息一起发送，也可以单独发送。即第一指示信息可以为一个单独的控制信息，或者携带在现有DCI中。对于携带在DCI中的方式而言，如果基站仅需要指示终端进行HARQ反馈，而无下行数据时，可以通过将DCI中资源分配的字段置零来实现。例如，将NR系统中的DCI format 1_0/DCI format 1_1中包含的字段“Frequency domain resource assignment”置零，表示无下行数据传输。此时，该字段置零还可以表示第一指示信息。即用该字段通知终端需要对下行数据传输进行HARQ反馈。
终端接收到第一指示信息。终端即可获知其需要进行HARQ反馈(例如基于两步调度的HARQ反馈)。因此，终端会等待接收第二指示信息，以进一步获知进行HARQ反馈的第二时间信息。第二时间信息可以是终端HARQ反馈的时间相对于接收第二指示信息的时间偏移量或可以用于HARQ反馈的时长(或时间资源)中的一种或多种。其中该时间偏移量 可以为多个终端的公共的时间偏移量。
其中，第二指示信息可以是针对某一终端的信息(例如是终端specific的信息)。或第二指示信息为公共控制信息。例如，第二指示信息可以承载在公共物理下行控制信道(common-physical downlink control channel，C-PDCCH)，或，组公共物理下行控制信道(group common-physical downlink control channel，GC-PDCCH)中进行传输。
在一种可能的实现方式中，第二指示信息，需要指示终端在什么时刻进行HARQ反馈。即第二指示信息中包含HARQ反馈的第二时间信息。第二时间信息可以是终端进行HARQ反馈时间相对于终端接收到第二指示信息的时间偏移量，或者，第二时间信息为终端进行HARQ反馈的绝对时间。进一步地，第二指示信息中还可以指示终端有多少下行数据传输需要进行HARQ反馈。即可以用第二指示信息指示需要进行HARQ反馈的比特数。或者，第二指示信息还可以针对第一指示信息和/或其他调度信息(例如DCI中的下行分配索引(Downlink Assignment Index，DAI)字段)中已经指示过的终端需要反馈的HARQ比特数进行更新。
进一步地，第二指示信息还携带可用于HARQ反馈的资源的信息。具体地，第二指示信息包括为终端分配一个或多个HARQ反馈资源的信息。当第二指示信息为公共控制信息时，第二指示信息可以包括为多个终端分配的多个HARQ反馈资源的信息。其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源。本申请实施例中的HARQ反馈资源可以是时间资源。例如图3或图4中的时间单元。
进一步地，第二指示信息中还可以指示终端对哪些下行数据传输需要进行HARQ反馈(应理解，可以针对第一指示信息中的指示进行刷新指示)。例如，可通过显式或隐式的方式指示所述需要进行HARQ反馈的一个或多个下行数据传输对应的HARQ进程信息(HARQ process)。可选的，可以通过通知终端一个或多个HARQ process ID/number的方式指示终端对与该一个或多个HARQ process ID/number对应的一个或多个下行数据传输进行HARQ反馈。具体地，可以明示地将该一个或多个HARQ process ID/number携带在第一指示信息中。或者，可以通过位图(bitmap)的方式指示该一个或多个HARQ process ID/number。位图中的每一个比特位对应HARQ process ID/number(也可以认为位图中的每一个比特位指示了一个HARQ进程)。一种可能的实现方式，若该比特位为第一值(例如“1”)，则表示该比特位所指示的HARQ进程所对应的下行数据传输需要进行HARQ反馈。若该比特位为第二值(例如“0”)，则表示该比特位所指示的HARQ进程所对应的下行数据传输不需要进行HARQ反馈。进一步地，还可以对HARQ进程进行分组。利用第一指示信息指示所述需要进行HARQ反馈的一个或多个下行数据传输对应的HARQ进程的分组信息。这样可以节约信令开销。或者，还可以对HARQ process ID和其他信息(如时间信息)进行联合编码，以进一步节约信令开销。
在一种可能的实现方式中，第二指示信息可以与下行调度信息一起发送，也可以单独发送。即第二指示信息可以为一个单独的控制信息，或者携带在现有DCI中。对于携带在DCI中的方式而言，如果基站仅需要指示终端在何时进行HARQ反馈，而无下行数据时，可以通过将DCI中资源分配的字段置零来实现。例如，将NR系统中的DCI format 1_0/DCI format 1_1中包含的字段“Frequency domain resource assignment”置零，表示无下行数据传输。进一步地，该字段置为其他特定值是还可以表示第二指示信息。即用该字段 通知终端何时对下行数据传输进行HARQ反馈。
可选地，基站在发送第一指示信息和发送第二指示信息之间的时间偏移需满足一定的条件。例如，该时间偏移不大于预设时长。该预设时长可以携带在第一指示信息中。终端在收到所述第一指示信息后，即获知需要对下行数据传输进行HARQ反馈。因此终端可能需要等待接收第二指示信息。若携带第二指示信息的DCI的格式与携带第一指示信息的DCI的格式不同，则终端指示在预设时长的范围内进行盲检第二指示信息，超过预设时长终端可以不盲检，从而可以节省开销。若利用现有的DCI来携带第二指示信息，则基站可以不发送预设时长的信息。终端通过接收第二指示信息，获知基站指示的进行HARQ反馈的第二时间信息。当第一指示信息中包含预设时长的信息时，终端在该预设时长内等待接收第二指示信息。终端等待的时间超出该预设时长时，则不再等待接收第二指示信息。可选的，当第一指示信息中包含第一时间信息时，结合第二指示信息中的第二时间信息，终端可获知实际反馈的HARQ的时间信息。例如，终端实际发送HARQ反馈的时间与终端第二指示信息之间的时间偏移量等于第一时间信息指示的时间偏移量和第二时间信息指示的时间偏移量的和。也就是说，终端可以在根据第一指示信息和第二指示信息确定的HARQ反馈资源上进行HARQ反馈。
可选的，用于携带第一指示信息的字段(或控制信令)还用于指示终端是否基于两步调度的方式进行HARQ反馈。也就是说，该控制信令(或字段)至少可以取两个值。其中，第一值表示该字段携带的是第一指示信息，或该字段指示终端基于两步调度的方式进行HARQ反馈。第二值表示该字段指示终端不基于两步调度的方式进行HARQ反馈。
可选的，可以通过复用现有下行控制信息中的一个或多个字段来终端是否基于两步调度的方式进行HARQ反馈。例如，当DCI中的某些字段为预设的取值时，可以用来指示终端基于两步调度的方式进行HARQ反馈。具体地，NR系统中的DCI format 1_0/DCI format 1_1中包含字段“PDSCH-to-HARQ_feedback timing indicator”。将字段“PDSCH-to-HARQ_feedback timing indicator”的所有可能的取值进行分组，例如分为组A和组B。若该字段的取值位于组A，则代表该DCI中包含第一指示信息，即指示终端对下行数据传输进行HARQ反馈。若该字段的取值位于组B，则代表该DCI中不包含第一指示信息，即指示终端不对下行数据传输进行HARQ反馈或不基于两步调度的方式进行HARQ反馈。可选地，该字段的实际取值可以用于指示第一指示信息中的预设时长或第一时间信息。所述有效窗口和HARQ反馈时间信息中的一种或多种。
可选地，用于携带第一指示信息或第二指示信息的控制信令还可以包括标识信息，该标识信息用于指示该信令携带的是第一指示信息还是第二指示信息。具体地，该标识信息取第一值时表示该控制信息携带的是第一指示信息。该标识信息取第二值时表示该控制信息携带的是第二指示信息。当然，该标识信息可以为第一指示信息或第二指示信息中的一部分。
下面结合图3至图6对本实施例提供的HARQ反馈方法进一步进行描述。
图3为一种HARQ反馈的时序示意图。如图3所示，基站获得第一信道占用时间COT后，如果在第一COT内无法调度终端进行HARQ反馈，可通过两步调度的方式进行HARQ反馈。一种可能的实施方式，基站通过基于随机退避的信道接入机制获得信道的使用权。具 体地，在所述第一COT内，基站发送第一指示信息，通知终端需要对相应的下行数据传输进行HARQ反馈。基站获得一个新的信道使用权，即获得第二COT后，在第二COT内，发送第二指示信息，以指示终端在什么时间进行HARQ反馈。当然，基站和终端也可以在一个COT内进行基于两步调度的HARQ反馈。也就是说基于两步调度的HARQ反馈方式并不限定其是否在一个COT内完成，其实现方式可以参照本申请相关实施例(例如图4所示的实施例)得到。
终端在时间单元n-p处接收第一指示信息，则终端需要等待接收第二指示信息。终端在时间单元n处接收第二指示信息，第二指示信息中携带时间偏移量2的信息。该时间偏移量2即为第二时间信息。终端即可获知其可以在相对于时间单元n偏移时间偏移量2所对应个数的时间单元进HARQ反馈。
图3所示的第二指示信息是针对特定终端的，因此，该终端只需知道第二时间信息即可获知进行HARQ反馈的时间，而不必再需要第一时间信息。也即，终端获得时间偏移量2后，即获知了进行HARQ反馈的时间资源。终端在该资源上进行HARQ反馈。
图4为另一种HARQ反馈的时序示意图。如图4所示，基站在时间单元n-p处发送第一指示信息，通知终端需要对下行数据传输进行HARQ反馈。基站在时间单元n处发送第二指示信息，以指示终端在什么时间进行HARQ反馈。第一指示信息中还可以携带预设时长的信息。当终端等待接收第二指示信息的时间超过预设时长时，则终端不再继续等待。例如，图4所示的p个时间单元超过预设时长，则终端不会在时间单元n处接收第二指示信息。第二指示信息中携带时间偏移量2(即第二时间信息)。进一步地，第二指示信息还携带可用于HARQ反馈的资源的信息。第二指示信息可以为公共控制信息，则时间偏移量2和可用于HARQ反馈的资源都是针对多个终端而言的。其中，基站为多个终端中的每个终端可以分配一个或多个HARQ反馈资源。对于某一确定的终端，还需要更多的信息以确定该终端进行HARQ反馈的资源。因此，第一指示信息还携带时间偏移量1。时间偏移量1表示该终端进行HARQ反馈的资源相对于整个可用于HARQ反馈的资源的起始位置的偏移。由此，终端可以在第(n+时间偏移量1+时间偏移量2)个时间单元上进行HARQ反馈。若基站为该终端分配了m个HARQ反馈资源，则终端可以在第(n+时间偏移量1+时间偏移量2)个至第(n+时间偏移量1+时间偏移量2+m-1)个时间单元上进行HARQ反馈.
图4所示的第二指示信息是公共的或者是组公共的。因此，接收到第二指示信息的终端除了要获知第二时间信息还需要获知第一时间信息。这样才可以获知该终端实际进行HARQ反馈的时间。而图3所示的情况则不必再需要第一时间信息。
应理解，第一时间信息或第二时间信息的度量、以及图3或图4相关描述中提及的时间单元可以是符号(symbol)、迷你时隙(mini-slot)、时隙(slot)、子帧(subframe)、帧(frame)等，或者也可以是微秒(us)、毫秒(ms)、秒(s)、分钟(min)等，对此本申请不做限制。可选的，当系统中支持多种numerology时，第一时间信息或第二时间信息如果以符号、迷你时隙、时隙、子帧、帧等为基本单位，则第一时间信息或第二时间信息中还需包括参考的numerology信息，例如子载波间隔的信息。可选的，所述参考numerology信息也可是预定义的。
图5为一种第一指示信息的结构示意图。如图5所示，第一指示信息在下行控制信息中可以有相同或类似的结构。具体地，第一指示信息包括字段1。字段1携带的是触发信 息或标识信息。触发信息可以用于触发终端进行HARQ反馈。标识信息可以用于标识该第一指示信息或用于标识该下行控制信息包含第一指示信息。进一步地，第一指示信息还包括携带预设时长信息的字段2、携带第一时间信息的字段3、携带HARQ进行信息的字段4以及携带HARQ反馈比特数的字段5中的一个或多个。其中，携带HARQ反馈比特数的字段5可以是DAI字段或扩展DAI字段。进一步地，字段1和第一指示信息中的其他字段可以通过联合编码的方式进行编码，然后传输。另外，第一指示信息中各个字段的顺序可以任意变换，以及各个字段间可以是不连续(例如插入其他字段)，对此本申请，不作限定。
图6为一种第二指示信息的结构示意图。如图6所示，第二指示信息在下行控制信息中可以有相同或类似的结构。具体地，第二指示信息包括字段1。字段1携带的是触发信息或标识信息。触发信息可以用于触发终端根据第二时间信息进行HARQ反馈。标识信息可以用于标识该第二指示信息或用于标识该下行控制信息包含第二指示信息。进一步地，第二指示信息还包括携带第一时间信息的字段2、携带HARQ进行信息的字段3以及携带HARQ反馈比特数的字段4中的一个或多个。其中，携带HARQ反馈比特数的字段4可以是DAI字段或扩展DAI字段。进一步地，字段1和第二指示信息中的其他字段可以通过联合编码的方式进行编码，然后传输。外，第二指示信息中各个字段的顺序可以任意变换，以及各个字段间可以是不连续(例如插入其他字段)，对此本申请，不作限定。
基于同一发明构思，本申请实施例还提供一种通信装置。该基站可用于执行上述方法实施例中基站或终端所执行的方法。
请参照图7，其示出了上述方法实施例中所涉及的通信装置的一种可能的结构示意图。在图7所示的结构中，通信装置700可以包括：接收单元710和发送单元720。
在一种可能的设计中，通信装置700可以为基站或配置于基站中的芯片或终端或配置与终端中的芯片。
在一种可能的实现方式中，发送单元720用于发送第一指示信息，第一指示信息用于指示终端进行HARQ反馈；以及用于发送第二指示信息，第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；接收单元710用于接收终端的HARQ反馈信息。
在另一种可能的实现方式中，接收单元710用于接收第一指示信息，第一指示信息用于指示所述终端进行HARQ反馈；以及用于接收第二指示信息，第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；发送单元720向基站发送HARQ反馈信息。
进一步地，通信装置700还可能包括处理单元730，所述处理单元用于处理接收到的信息以及用于处理要发送的信息。
需要说明的是，通信装置700可用于执行上述方法实施例中基站或终端所执行的方法，通信装置700中未详尽描述的实现方式及其技术效果可参见上述方法实施例的相关描述。
基于同一发明构思，本申请实施例还提供一种基站。该基站可用于执行上述方法实施例中基站所执行的方法。
请参照图8，其示出了上述方法实施例中所涉及的基站的一种可能的结构示意图。该基站可以包括：收发器801。收发器801可以进一步包括接收器和发射器。
其中，发射器用于发送第一指示信息，第一指示信息用于指示终端进行HARQ反馈；以及用于发送第二指示信息，第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；接收器用于接收终端的HARQ反馈信息。
应理解，在一些的实施例中，收发器801可以由发射器和接收器集成。在其他的实施例中，发射器和接收器也可以相互独立。
进一步地，基站还可以包括处理器802、存储器803和通信单元804。其中，收发器801、处理器802、存储器803和通信单元804通过总线连接。
在下行链路上，待发送的数据(例如，PDSCH)或者信令(例如，PDCCH)经过收发器801调节输出采样并生成下行链路信号，该下行链路信号经由天线发射给上述实施例中的终端。在上行链路上，天线接收上述实施例中终端发射的上行链路信号，收发器801调节从天线接收的信号并提供输入采样。在处理器802中，对业务数据和信令消息进行处理，例如对待发送的数据进行调制、SC-FDMA符号生成等。这些单元根据无线接入网采用的无线接入技术(例如，LTE、5G及其他演进系统的接入技术)来进行处理。
处理器802还用于对基站进行控制管理，以执行上述方法实施例中由基站进行的处理。具体地，处理器802用于处理接收到的信息以及用于处理要发送的信息。作为示例，处理器802用于支持基站执行图2至图6所涉及基站的处理过程。应用于非授权场景下，处理器802还需要控制基站进行信道侦听，以进行数据或者信令的传输。示例性地，处理器802通过收发器801从收发装置或者天线接收到的信号来进行信道侦听，并控制信号经由天线发射以抢占信道。在不同的实施例中，处理器802可以包括一个或多个处理器，例如包括一个或多个中央处理器(Central Processing Unit，CPU)，处理器802可以集成于芯片中，或者可以为芯片本身。
存储器803用于存储相关指令及数据，以及基站的程序代码和数据。在不同的实施例中，存储器603包括但不限于是随机存储记忆体(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、或便携式只读存储器(Compact Disc Read-Only Memory，CD-ROM)。在本实施例中，存储器803独立于处理器802。在其它的实施例中，存储器803还可以集成于处理器802中。
需要说明的是，图8所示的基站可用于执行上述方法实施例中基站所执行的方法，关于图8所示的基站中未详尽描述的实现方式及其技术效果可参见上述方法实施例的相关描述。
基于同一发明构思，本申请实施例还提供一种基站。该基站可用于执行上述方法实施例中基站所执行的方法。
请参照图9，其示出了上述方法实施例中所涉及的终端的一种可能的结构示意图。该终端可以包括：收发器901。收发器901可以进一步包括接收器和发射器。
其中，接收器用于接收第一指示信息，第一指示信息用于指示终端进行HARQ反馈；以及用于接收第二指示信息，第二指示信息包括用于指示终端进行HARQ反馈的第二时间信息；发射器向基站发送HARQ反馈信息。
应理解，在一些的实施例中，收发器901可以由发射器和接收器集成。在其他的实施 例中，发射器和接收器也可以相互独立。
进一步地，该终端还可以包括处理器902，存储器903和调制解调器904。其中，收发器901，处理器902，存储器903和调制解调器904通过总线连接。
收发器901调节(例如，模拟转换、滤波、放大和上变频等)输出采样并生成上行链路信号，该上行链路信号经由天线发射给上述实施例中的基站。在下行链路中，天线接收上述实施例中来自基站的下行链路信号。收发器901调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。示例性地，在调制处理器904中，编码器9041接收要在上行链路上发送的业务数据和信令消息，并对业务数据和信令消息进行处理(例如，格式化、编码和交织)。调制器9042进一步处理(例如，符号映射和调制)编码后的业务数据和信令消息并提供上述输出采样。解调器9043处理(例如，解调)上述输入采样并提供符号估计。解码器9044处理(例如，解交织和解码)该符号估计并提供发送给终端的已解码的数据和信令消息。编码器9041、调制器9042、解调器9043和解码器9044可以由合成的调制解调处理器904来实现。这些单元根据无线接入网采用的无线接入技术(例如，LTE、5G及其他演进系统的接入技术)来进行处理。
处理器902对终端进行控制管理，用于执行上述方法实施例中由终端进行的处理。例如，用于控制终端进行上行传输和/或本申请所描述的技术的其他过程。作为示例，处理器902用于支持终端执行图2至图6中涉及终端的处理过程。例如，收发器901用于控制/通过天线接收下行传输的信号。在不同的实施例中，处理器902可以包括一个或多个处理器，例如包括一个或多个CPU，处理器902可以集成于芯片中，或者可以为芯片本身。
存储器903用于存储相关指令及数据，以及终端的程序代码和数据。在本实施例中，存储器903独立于处理器902。在其它的实施例中，存储器903还可以集成于处理器902中。
需要说明的是，图9所示的终端可用于执行上述方法实施例中终端所执行的方法，关于图9所示的基站中未详尽描述的实现方式及其技术效果可参见上述方法实施例的相关描述。
可以理解的是，图8和图9仅仅示出了基站和终端的简化设计。在不同的实施例中，基站和终端可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本申请的基站和终端都在本申请的保护范围之内。
本申请的一个实施例提供了一种通信系统。该通信系统包括基站和终端。其中，基站可以是图7所示的通信装置或图8所示的基站。终端可以是图7所示的通信装置或图9所示的终端。
基于同一发明构思，本申请实施例还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行图2至图6所示实施例中的方法。
基于同一发明构思，本申请实施例还提供一种计算机可读介质，该计算机可读解释存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行图2至图6所示实施例中的方法。
基于同一发明构思，本申请实施例还提供了一种芯片。该芯片可以是一种处理器，用于实现上述方法实施例中的方法。进一步地，所述芯片与存储器相连，用于读取并执行所 述存储器中存储的软件程序，以实现图2至图6所示实施例中的方法。
基于同一发明构思，本申请实施例提供了一种芯片，所述芯片包含处理器和存储器，所述处理器用于读取所述存储器中存储的软件程序，以实现图2至图6所示实施例中的方法。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘solid state disk(SSD))等。

Claims (27)

  1. 一种混合自动重传请求HARQ反馈方法，其特征在于，包括：
    基站发送第一指示信息，所述第一指示信息用于指示终端进行HARQ反馈；
    所述基站发送第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；
    所述基站接收所述终端的HARQ反馈信息。
  2. 根据权利要求1所述的方法，其特征在于，包括：
    所述基站在第一信道占用时间COT内发送所述第一指示信息，以及在第二COT内发送所述第二指示信息。
  3. 根据权利要求1或2所述的方法，其特征在于，包括：
    所述第二时间信息包括进行HARQ反馈的时间相对于第二指示信息的时间偏移量，或者，所述第二时间信息包括进行HARQ反馈的绝对时间。
  4. 根据权利要求1至3任一项所述的方法，其特征在于，包括：
    所述基站发送所述第一指示信息和发送第二指示信息之间的时间偏移不大于预设时长。
  5. 根据权利要求4所述的方法，其特征在于，包括：
    所述第一指示信息还包括用于指示所述预设时长的信息。
  6. 根据权利要求1至5任一项所述的方法，其特征在于，包括：
    所述第二指示信息还包括为所述终端分配一个或多个HARQ反馈资源的信息。
  7. 根据权利要求1至5任一项所述的方法，其特征在于，包括：
    所述第二指示信息还包括为多个终端分配的多个HARQ反馈资源的信息，其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源，所述多个终端包括所述终端。
  8. 根据权利要求7所述的方法，其特征在于，包括：
    所述第一指示信息还包括第一时间信息，所述第一时间信息包括的第一时间偏移量；
    所述第一时间信息用于指示所述终端在相对于所述第二指示信息发送时间偏移所述第一时间偏移量和第二时间偏移量的一个或多个HARQ反馈资源上进行HARQ反馈。
  9. 一种混合自动重传请求HARQ反馈方法，其特征在于，包括：
    终端接收第一指示信息，所述第一指示信息用于指示所述终端进行HARQ反馈；
    所述终端接收第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；
    所述终端向基站发送HARQ反馈信息。
  10. 根据权利要求9所述的方法，其特征在于，包括：
    所述终端在所述基站的第一信道占用时间COT内接收所述第一指示信息，以及在所述基站的第二COT内接收所述第二指示信息。
  11. 根据权利要求9或10所述的方法，其特征在于，包括：
    所述第二时间信息包括进行HARQ反馈的时间相对于第二指示信息的时间偏移量，或者，所述第二时间信息包括进行HARQ反馈的绝对时间。
  12. 根据权利要求9至11任一项所述的方法，其特征在于，包括：
    所述第一指示信息和第二指示信息之间的时间偏移不大于预设时长。
  13. 根据权利要求12所述的方法，其特征在于，包括：
    所述第一指示信息还包括用于指示所述预设时长的信息。
  14. 根据权利要求9至13任一项所述的方法，其特征在于，包括：
    所述第二指示信息还包括为所述终端分配一个或多个HARQ反馈资源的信息。
  15. 根据权利要求9至13任一项所述的方法，其特征在于，包括：
    所述第二指示信息还包括为多个终端分配的多个HARQ反馈资源的信息，其中，为所述多个终端中的每个终端分配一个或多个HARQ反馈资源，所述多个终端包括所述终端。
  16. 根据权利要求15所述的方法，其特征在于，包括：
    所述第一指示信息还包括第一时间信息，所述第一时间信息包括的第一时间偏移量；
    所述第一时间信息用于指示所述终端在相对于所述第二指示信息发送时间偏移所述第一时间偏移量和第二时间偏移量的一个或多个HARQ反馈资源上进行HARQ反馈。
  17. 一种基站，其特征在于，包括：发射器和接收器，其中：
    所述发射器用于发送第一指示信息，所述第一指示信息用于指示终端进行HARQ反馈；以及用于发送第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；
    所述接收器用于接收所述终端的HARQ反馈信息。
  18. 一种终端，其特征在于，包括：发射器和接收器，其中：
    所述接收器用于接收第一指示信息，所述第一指示信息用于指示所述终端进行HARQ反馈；以及用于接收第二指示信息，所述第二指示信息包括用于指示所述终端进行HARQ反馈的第二时间信息；
    所述发射器向基站发送HARQ反馈信息。
  19. 一种通信系统，其特征在于，包括：基站和终端，其中：
    所述基站为权利要求17所述的基站；
    所述终端为权利要求18所述的终端。
  20. 一种通信装置，其特征在于，包括：
    处理器，用于与存储器耦合，执行所述存储器中的指令，以实现如权利要求1至16中任一项所述的方法。
  21. 根据权利要求20所述的装置，其特征在于，还包括：
    所述存储器。
  22. 一种芯片，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器中调用并运行所述计算机程序，使得安装有所述芯片系统的通信装置执行如权利要求1至16中任一项所述的方法。
  23. 一种计算机可读介质，其特征在于，包括计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行如权利要求1至16中任一项所述的方法。
  24. 一种计算机程序产品，其特征在于，包括计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行如权利要求1至16中任一项所述的方法。
  25. 根据权利要求1-16任一项所述的方法或前述任一项装置，其特征在于，还包括：
    所述第一指示信息用PDSCH-to-HARQ_feedback timing indicator携带。
  26. 根据权利要求1-16任一项所述的方法或前述任一项装置，其特征在于，还包括：
    所述第二指示信息用PDSCH-to-HARQ_feedback timing indicator携带。
  27. 根据权利要求1-16任一项所述的方法或前述任一项装置，其特征在于，还包括：
    所述第一指示信息或所述第二指示信息根据无线资源控制RRC信令中所包含的dl-DataToUL-ACK字段来确定。
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