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WO2021228011A1 - Procédé de communication et dispositif associé - Google Patents

Procédé de communication et dispositif associé Download PDF

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Publication number
WO2021228011A1
WO2021228011A1 PCT/CN2021/092562 CN2021092562W WO2021228011A1 WO 2021228011 A1 WO2021228011 A1 WO 2021228011A1 CN 2021092562 W CN2021092562 W CN 2021092562W WO 2021228011 A1 WO2021228011 A1 WO 2021228011A1
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WO
WIPO (PCT)
Prior art keywords
dci
time
terminal device
dai
information
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2021/092562
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English (en)
Chinese (zh)
Inventor
费永强
郑娟
侯海龙
李超君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2021228011A1 publication Critical patent/WO2021228011A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and related equipment.
  • the information exchanged between a base station and a terminal device can be carried through a physical channel.
  • the downlink data sent by the base station to the terminal device may be carried by a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the terminal device may feedback to the base station whether the downlink data is received correctly in the uplink feedback timing corresponding to the downlink data.
  • the terminal device can feedback the reception of downlink data on a physical uplink shared channel (PUSCH).
  • the downlink control information (DCI) used to schedule the PUSCH will include the downlink assignment index (DAI) DAI.
  • DAI can be used to assist the terminal device to correctly feed back the received downlink data.
  • the DCI used to schedule the PUSCH is also called UL-DCI, and the DAI included in the DCI that schedules the PUSCH is also called UL-DAI.
  • the aforementioned downlink assignment index DAI may also be referred to as a downlink assignment indicator (downlink assignment indicator).
  • This application provides a communication method and related equipment, which indicate to the terminal equipment whether the downlink control information used for scheduling uplink transmission includes DAI information, so as to realize the transmission of DAI according to specific needs, and reduce the load to improve the downlink transmission. It also guarantees the reliability of downlink transmission feedback while being reliable.
  • the first aspect of the present application provides a communication method.
  • the method includes: a network device sends first information to a terminal device, the first information indicates whether the first DCI includes DAI or does not include DAI, the first DCI is used to schedule uplink transmission, and the first DCI is used to schedule uplink transmission.
  • the format of a DCI is the first format; the network device sends the first DCI to the terminal device.
  • the first DCI is DCI used to schedule uplink transmission of the terminal device, for example, the first DCI is DCI used to schedule PUSCH.
  • the first DCI is at least one DCI in a first format, and the first format may specifically be any one of DCI format 0_0, DCI format 0_1, or DCI format 0_2.
  • the DAI is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data.
  • the DAI is used by the terminal device to generate a dynamic hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook and sends it in the PUSCH.
  • HARQ-ACK dynamic hybrid automatic repeat request acknowledgement
  • the method further includes: a network device generates the first information and/or the first DCI.
  • the method further includes that the network device sends downlink data to the terminal device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the first DCI may be one or more first DCIs with the same format.
  • the first information indicating that DAI is included in the first DCI may specifically be that the first information indicates that the number of bits of DAI in the first DCI is not 0; the first information indicating that DAI is not included in the first DCI may specifically be the first information indicating The number of bits of DAI in the first DCI is 0.
  • the first information may be used to indicate that DAI is not included in the first DCI, or the first information may be used to indicate that the number of bits of DAI in the first DCI is 0, or the first information It may be used to indicate that the terminal device is in the first state.
  • the first DCI sent by the network device to the terminal device does not include DAI.
  • the terminal device can use the first information
  • the instructions confirm that the work is in the first state.
  • the first information may be used to indicate at least one of that the first DCI does not include DAI, the number of bits of DAI in the first DCI is 0, or the terminal device is in the first state.
  • the terminal device in the first state has no downlink data transmission or there is a small amount of downlink data transmission between network devices.
  • a scenario where there is a small amount of downlink data transmission may include: for a terminal device, a scenario where the number of PDSCHs actually scheduled by the network device is one.
  • the terminal device being in the first state may specifically be the terminal device being in a preset mode, for example, the terminal device being in mode 1, which may be the terminal device preset at the factory or the terminal device.
  • the equipment is configured during use.
  • the terminal device in mode 1 has no downlink data transmission or only a small amount of downlink data transmission, and the terminal device may not need to use the UL-DAI in the UL-DCI.
  • the first information may be used to indicate that the first DCI includes DAI, or the first information may be used to indicate that the number of bits of DAI in the first DCI is not 0, or the first information It may be used to indicate that the terminal device is in the second state.
  • the first DCI sent by the network device to the terminal device includes DAI.
  • the first information may be used to indicate at least one of the first DCI including DAI, the number of bits of the DAI field in the first DCI is not 0, or the terminal device is in the second state. Specifically, there is a large amount of downlink data transmission between the terminal device in the second state and the network device.
  • the scenario where a large amount of downlink data is transmitted between the network device and the terminal device may include: for the terminal device, the scenario where the number of PDSCHs actually scheduled by the network device is greater than one.
  • that the terminal device is in the first state may also be in a preset mode.
  • the terminal device is in mode 2.
  • the mode 2 may be preset by the terminal device at the factory or The terminal equipment is configured during use.
  • the terminal device is in mode 2
  • the first information is carried by a radio resource control (radio resource control, RRC) message, that is, the network device may send an RRC message to the terminal device, and the RRC message carries the first information.
  • RRC radio resource control
  • the first information may also be carried by media access control (MAC) control element (CE), that is, the network device sends the MAC CE to the terminal device, and The first information is carried in the MAC CE.
  • MAC media access control
  • the method further includes: the network device sends first time indication information to the terminal device, where the first time indication information is used to indicate the first time period.
  • the first information is used to indicate that the first DCI located in the first time period does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first information is used to indicate The first DCI in the first time period includes DAI, or, in the first time period, the terminal device is in the second state.
  • the first time indication information may be included in the first information, that is, the first information includes first time indication information for indicating the first time period. Alternatively, the first time indication information may also be other information different from the first information.
  • the network device can carry the first time indication information through an RRC message or MAC CE and send it to the terminal device.
  • the first time indication information is used to indicate the time period in which DAI is included or not included in the first DCI, so that the terminal device can clarify in which time periods the received first DCI includes DAI and in which time periods the received first DCI includes DAI.
  • the first DCI does not include DAI, which improves communication performance and efficiency.
  • the first time indication information is used to indicate one or more of the cycle length, time offset, and duration of the first time period.
  • the first time indication information may include one or more of the period length, time offset, and duration of the first time period, or the first time indication information may include Information about one or more of the period length, time offset, and duration of the first time period.
  • the period duration is the period of the first time period;
  • the duration is the duration of the first time period;
  • the time offset is the offset between the start time of the first time period and the start time of the period in which the first time period is located Or
  • the time offset is the offset between the end time of the first time period and the end time of the period in which the first time period is located.
  • multiple periodic first time periods can be determined based on the period length, time offset, and duration.
  • the time interval between each first time period is the same, and the aforementioned period length is any two phases.
  • the length of time between adjacent first time periods that is, the period duration is the period of the first time period; the aforementioned duration is the duration of each first time period; the aforementioned time offset is any one of the first time periods
  • the offset between the start time of the first time period and the start time of the cycle in which the first time period is located; or, the time offset is the offset between the end time of the first time period and the end time of the cycle in which the first time period is located Shift.
  • the first time period is specifically determined by the period length, the time offset, and the duration.
  • the first time indication information may include cycle duration, time offset, and duration, and the first time indication information may also include one or two of cycle duration, time offset, and duration.
  • the terminal device can learn the period length and time without using the first time indication information.
  • the first time indication information may include the remaining two or one of the cycle duration, the time offset, and the duration.
  • the network device sending the first DCI to the terminal device may include: the network device sending the first DCI to the terminal device at the first moment or after the first moment, the first DCI does not include DAI; where , The first moment is the Nth time unit after the moment when the network device sends the first information, N is greater than or equal to 1, and N is pre-defined or pre-configured.
  • the first moment is the Nth time unit after the moment when the network device sends the first information, N is greater than or equal to 1, and N is pre-defined or pre-configured.
  • a valid time of the first information may be defined to ensure that the network device sends the first DCI to the terminal device after the content indicated by the first information becomes valid. That is, the length of time between the aforementioned first moment and the moment when the network device sends the first information is greater than or equal to the length of time of the effective time.
  • the network device sending the first DCI to the terminal device may include: the network device sends the first DCI to the terminal device at the first moment or after the first moment, and the first DCI includes DAI; where, The first moment is the Nth time unit after the moment when the network device sends the first information, N is greater than or equal to 1, and N is pre-defined or pre-configured.
  • the network device may also send the first DCI to the terminal device after the content indicated by the first information becomes effective, that is, the network device is in the first DCI. Send the first DCI to the terminal device after a time or the first time.
  • the network device sending the first DCI to the terminal device may include: the network device sends the first DCI to the terminal device in the second time period after the first moment, the first DCI does not include DAI or includes DAI; Time is the Nth time unit after the time when the network device sends the first information, N is greater than or equal to 1, N is predefined or pre-configured, and the second time period is predefined, pre-configured for the terminal device, or The length of time indicated to the terminal device through the first information.
  • the network device may send the first DCI that does not include DAI to the terminal device within the time period when the content indicated by the first information is valid, where the second time period after the first time is the time period of the first information. The time period when the indicated content takes effect.
  • the second time period may be pre-defined in a standard protocol or pre-defined in other ways, or configured by the network device for the terminal device through an RRC message or the like, or sent to the terminal device through MAC CE The terminal device, or the network device instructs the terminal device through the first information.
  • a second aspect of the present application provides a communication method, including: a network device sends a second DCI to a terminal device, the second DCI is used to schedule downlink transmission; in a predefined or pre-configured time period after the second moment, the network device Send the first DCI to the terminal device, the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the time domain resource occupied by the second DCI
  • the mth time unit, m is a positive integer, 1 ⁇ m ⁇ M, and M is the number of time units occupied by the second DCI.
  • the measurement unit of the time unit may be a measurement unit such as a wireless frame, a subframe, a time slot, or a symbol, or other measurement units.
  • the second DCI may be any format or any type of DCI used for scheduling downlink transmission, that is, the second DCI may be any type of DL-DCI.
  • the network device may send the second DCI to the terminal device to schedule the PDSCH through the second DCI.
  • the method further includes that the network device generates the second DCI and/or the first DCI.
  • the method further includes that the network device sends downlink data to the terminal device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the second DCI is also used to indicate that the first DCI includes the DAI.
  • the second DCI sent by the network device to the terminal device may also be used to indicate to the terminal device that the first DCI includes DAI.
  • the second DCI indicating that the first DCI includes the effective time point of DAI may specifically be the aforementioned second moment, and the second DCI indicates that the first DCI includes the effective time period of DAI may be a predefined or predetermined time period after the second moment. Configured time period. That is, after the terminal device receives the second DCI, the terminal device may consider that the first DCI received in the predefined or pre-configured time period after the aforementioned second moment includes DAI.
  • the effective time period indicating that the DAI is included in the first DCI may be pre-defined or pre-configured, for example, it may be pre-defined in a standard protocol or pre-defined by other means, or it may be performed by the network device through RRC. Messages and other methods are configured for terminal equipment. Therefore, the network device may send the first DCI including DAI to the terminal device in a predefined or pre-configured time period after the second moment. After the terminal device receives the second DCI from the network device, it can be considered that the first DCI received in the predefined or pre-configured time period after the second moment includes DAI.
  • the DCI sent by the network device to the terminal device does not include DAI. That is, after the effective period of the second DCI sent by the network device ends, and before the network device sends the next information indicating that the DCI includes DAI to the terminal device, the second DCI indicates that the first DCI includes DAI.
  • the content of has expired that is, the DCI of the same type as the first DCI sent by the network device to the terminal device after the time period does not include DAI.
  • the DL-DCI sent by the network device to the terminal device is used to indicate to the terminal device that the UL-DCI includes DAI. There is no need to send a special message to the terminal device to indicate whether the UL-DCI includes DAI. Save signaling overhead.
  • the method further includes: the first DCI sent to the terminal device in a third time period before the second time does not include DAI. That is, before the network device sends the second DCI to the terminal device, the terminal device may consider that the first DCI does not include DAI, and the network device sends the first DCI that does not include DAI to the terminal device.
  • a third aspect of the present application provides a communication method, including: a network device sends downlink data to a terminal device; within a predefined or pre-configured time period after the second moment, the network device sends a first DCI to the terminal device, and the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the t-th time unit in the time domain resources occupied by the downlink data, and t is a positive integer, 1 ⁇ t ⁇ T, T is the number of time units occupied by the downlink data; or, the second moment is the sth time unit in the time domain resources occupied by the feedback timing corresponding to the downlink data, s is a positive integer, 1 ⁇ s ⁇ S, S is the number of time units occupied by the feedback opportunity corresponding to the downlink data.
  • the measurement unit of the time unit may be a measurement unit such as a radio frame, a subframe, a time slot, or a symbol, or may be another measurement unit, which is not specifically limited herein.
  • the downlink data sent by the network device to the terminal device may refer to the PDSCH, and the PDSCH may specifically be a PDSCH scheduled by DCI, or may be a PDSCH based on semi-static scheduling (Semi-static Scheduling, SPS).
  • the method further includes that the network device generates the downlink data and/or the first DCI.
  • the downlink data sent by the network device may be used to indicate to the terminal device that the first DCI includes DAI.
  • the downlink data indicating that the first DCI includes the effective time point of DAI may specifically be the aforementioned second moment, and the downlink data indicating that the first DCI includes the effective time period of the DAI may be predefined or pre-configured after the second moment. period.
  • the network device does not include the DAI in the first DCI sent to the terminal device. Including DAI.
  • the downlink data indicates that the first DCI includes The content of DAI is invalid, that is, the first DCI sent by the network device to the terminal device does not include DAI.
  • the method further includes: the first DCI sent to the terminal device in a third time period before the second time does not include DAI. That is, before the network device sends the second DCI to the terminal device, the terminal device may consider that the first DCI does not include DAI, and the network device sends the first DCI that does not include DAI to the terminal device.
  • the downlink data sent by the network device to the terminal device is used to indicate to the terminal device that the UL-DCI includes DAI. There is no need to send a special message to the terminal device to indicate whether the UL-DCI includes DAI, which can save Signaling overhead.
  • a fourth aspect of the present application provides a communication method, including: a terminal device receives first information from a network device; the terminal device receives a first DCI from the network device; wherein the first information indicates that the first DCI includes DAI or does not include DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format.
  • the method further includes: the terminal device demodulates the first DCI. Specifically, the terminal device demodulates the first DCI according to the first information.
  • the method further includes that the terminal device receives downlink data from the network device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the first information is used to indicate that the first DCI does not include DAI, or the first information is used to indicate that the terminal device is in the first state; the first DCI from the network device does not include DAI.
  • the first information is used to indicate that the first DCI includes DAI, or the first information is used to indicate that the terminal device is in the second state; the first DCI from the network device includes DAI.
  • the first information is carried by an RRC message or a MAC CE.
  • the method further includes: the terminal device receives first time indication information from the network device, where the first time indication information is used to indicate a first time period; wherein, the first information is used to indicate that it is located in The first DCI in the first time period does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first information is used to indicate that the first DCI in the first time period includes DAI, or, in the first time period, the terminal device is in the second state.
  • the first time indication information is used to indicate one or more of the cycle length, time offset, and duration of the first time period; wherein the cycle time is the period of the first time period; The duration is the length of the first time period; the time offset is the offset between the start time of the first time period and the start time of the cycle in which the first time period is located; or, the time offset is the first time period The offset between the end time and the end time of the period in which the first time period is located.
  • the terminal device receiving the first DCI from the network device includes: the terminal device receiving the first DCI sent by the network device at or after the first time, the first DCI does not include DAI; Wherein, the first moment is the Nth time unit after the sending moment of the first information, N is greater than or equal to 1, and N is pre-defined or pre-configured. It is understandable that in specific implementation, the time when the network device sends the information and the time when the terminal receives the information is delayed or inaccurate, but here the first time is uniformly regarded as the sending time of the first information, and the actual possible existence is ignored. Time delay.
  • the terminal device receiving the first DCI from the network device includes: the terminal device receiving the first DCI sent by the network device at or after the first time, the first DCI includes DAI; where , The first moment is the Nth time unit after the sending moment of the first information, N is greater than or equal to 1, and N is pre-defined or pre-configured.
  • the terminal device receiving the first DCI from the network device includes: the terminal device receiving the first DCI sent by the network device in a second time period after the first moment, the first DCI does not include DAI ;
  • the first moment is the Nth time unit after the sending moment of the first information, N is greater than or equal to 1, N is pre-defined or pre-configured, and the second time period is pre-defined, pre-configured, Or the length of time indicated by the first information.
  • the terminal device receiving the first DCI from the network device includes: the terminal device receiving the first DCI sent by the network device in a second time period after the first moment, where the first DCI includes DAI;
  • the first time is the Nth time unit after the sending time of the first information, N is greater than or equal to 1, N is pre-defined or pre-configured, and the second time period is pre-defined, pre-configured, or first The length of time indicated by a message.
  • a fifth aspect of the present application provides a communication method, including: a terminal device receives a second DCI from a network device, the second DCI is used to schedule downlink transmission; in a predefined or pre-configured time period after the second moment, the terminal The device receives the first DCI from the network device, the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the time domain resource occupied by the second DCI For the mth time unit in, m is a positive integer, 1 ⁇ m ⁇ M, and M is the number of time units occupied by the second DCI.
  • the method further includes demodulating the second DCI and/or the first DCI by the terminal device.
  • the method further includes that the terminal device receives downlink data from the network device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the method further includes: the terminal device receives the first DCI that does not include DAI from the network device in a third time period before the second moment.
  • a sixth aspect of the present application provides a communication method, including: a terminal device receives downlink data from a network device; within a predefined or pre-configured time period after the second moment, the terminal device receives the first DCI from the network device,
  • the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format;
  • the second moment is the t-th time unit in the time domain resources occupied by the downlink data, and t is positive Integer, 1 ⁇ t ⁇ T, T is the number of time units occupied by the downlink data; or, the second moment is the sth time unit in the time domain resource occupied by the feedback timing corresponding to the downlink data, s is a positive integer, 1 ⁇ s ⁇ S, S is the number of time units occupied by the feedback opportunity corresponding to the downlink data.
  • the method further includes: the terminal device demodulates the first DCI.
  • the method further includes: the first DCI from the network device received by the terminal device in a third time period before the second moment does not include DAI.
  • a seventh aspect of the present application provides a communication device.
  • the communication device may be a network device or a chip system or an integrated circuit inside the network device.
  • the communication device includes a sending unit; the sending unit is used to send first information to a terminal device, the first information indicating that the first downlink control information DCI includes a downlink allocation index DAI or does not include DAI, and the first DCI is used for For scheduling uplink transmission, the format of the first DCI is the first format; the first DCI is sent to the terminal device.
  • the communication device further includes a processing unit configured to generate the first information and/or the first DCI.
  • the sending unit is further configured to send downlink data to the terminal device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the first information is used to indicate that the first DCI does not include DAI, or the first information is used to indicate that the terminal device is in the first state; the first DCI sent to the terminal device does not include DAI .
  • the first information is used to indicate that the first DCI includes DAI, or the first information is used to indicate that the terminal device is in the second state; the first DCI sent to the terminal device includes DAI.
  • the first information is carried by an RRC message or a MAC CE.
  • the sending unit is further configured to: send first time indication information to the terminal device, where the first time indication information is used to indicate a first time period; wherein, the first information is used to indicate the location The first DCI in the first time period does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first information is used to indicate that the first DCI in the first time period includes DAI, or, in the first time period, the terminal device is in the second state.
  • the first time indication information is used to indicate one or more of the cycle length, time offset, and duration of the first time period; wherein the cycle time is the period of the first time period; The duration is the length of the first time period; the time offset is the offset between the start time of the first time period and the start time of the cycle in which the first time period is located; or, the time offset is the first time period The offset between the end time and the end time of the period in which the first time period is located.
  • the sending unit is further configured to: send the first DCI to the terminal device at the first moment or after the first moment, the first DCI does not include DAI; wherein, the first moment is the network device sending The Nth time unit after the time of the first information, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the sending unit is further configured to: send the first DCI to the terminal device at the first time or after the first time, and the first DCI includes DAI; wherein, the first time is for the network device to send the first DCI.
  • the Nth time unit after the time of a message, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the sending unit is further configured to: send the first DCI to the terminal device in a second time period after the first moment, the first DCI does not include DAI; wherein, the first moment is sent by the network device
  • the Nth time unit after the moment of the first message, N is greater than or equal to 1, N is predefined or pre-configured, and the second time period is predefined, pre-configured for the terminal device, or sent through the first message The length of time indicated by the terminal device.
  • the sending unit is further configured to: send the first DCI to the terminal device in a second time period after the first time, the first DCI includes DAI; wherein, the first time is the network device sending the first DCI The Nth time unit after the moment of a message, N is greater than or equal to 1, N is pre-defined or pre-configured, and the second time period is pre-defined, pre-configured for the terminal device, or sent to the terminal through the first message The length of time indicated by the device.
  • the eighth aspect of the present application provides a communication device.
  • the communication device may be a network device or a chip system or an integrated circuit inside the network device.
  • the communication device includes: a sending unit; the sending unit is used to: send a second DCI to the terminal device, the second DCI is used to schedule downlink transmission;
  • the device sends the first DCI, the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the mth time in the time domain resources occupied by the second DCI Time units, m is a positive integer, 1 ⁇ m ⁇ M, and M is the number of time units occupied by the second DCI.
  • the communication unit further includes a processing unit configured to generate the first DCI and/or the second DCI.
  • the sending unit is further configured to send downlink data to the terminal device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the sending unit is further configured to send the first DCI to the terminal device in a third time period before the second time does not include DAI.
  • a ninth aspect of the present application provides a communication device.
  • the communication device may be a network device or a chip system or an integrated circuit inside the network device.
  • the communication device includes: a sending unit; the sending unit is used to: send downlink data to a terminal device; send a first DCI to the terminal device within a predefined or pre-configured time period after the second moment, where the first DCI includes DAI, the first DCI is used to schedule uplink transmission, the format of the first DCI is the first format; where the second moment is the t-th time unit in the time domain resources occupied by the downlink data, t is a positive integer, 1 ⁇ t ⁇ T, T is the number of time units occupied by the downlink data; or, the second moment is the sth time unit in the time domain resources occupied by the feedback timing corresponding to the downlink data, s is a positive integer, 1 ⁇ s ⁇ S, S is the number of time units occupied by the feedback opportunity corresponding to the downlink data.
  • the communication device further
  • the sending unit is further configured to send the first DCI to the terminal device in a third time period before the second time does not include DAI.
  • a tenth aspect of the present application provides a communication device.
  • the communication device may be a terminal device or a chip system or an integrated circuit inside the terminal device.
  • the communication device includes: a receiving unit; the receiving unit is configured to: receive first information from a network device; the terminal device receives a first DCI from the network device; wherein the first information indicates that the first DCI includes DAI or does not include DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format.
  • the communication device further includes a processing unit configured to demodulate the first DCI. Specifically, the processing unit demodulates the first DCI according to the first information.
  • the receiving unit is further configured to receive downlink data from the network device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the first information is used to indicate that the first DCI does not include DAI, or the first information is used to indicate that the terminal device is in the first state; the first DCI from the network device does not include DAI.
  • the first information is used to indicate that the first DCI includes DAI, or the first information is used to indicate that the terminal device is in the second state; the first DCI from the network device includes DAI.
  • the first information is carried by an RRC message.
  • the receiving unit is further configured to: receive first time indication information from the network device, where the first time indication information is used to indicate a first time period; wherein, the first information is used to indicate the location The first DCI in the first time period does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first information is used to indicate that the first DCI in the first time period includes DAI, or, in the first time period, the terminal device is in the second state.
  • the first time indication information is used to indicate one or more of the cycle length, time offset, and duration of the first time period; wherein the cycle time is the period of the first time period; The duration is the length of the first time period; the time offset is the offset between the start time of the first time period and the start time of the cycle in which the first time period is located; or, the time offset is the first time period The offset between the end time and the end time of the period in which the first time period is located.
  • the receiving unit is further configured to: receive the first DCI sent by the network device at or after the first time, the first DCI does not include DAI; wherein, the first time is the first DCI.
  • the Nth time unit after the information sending time, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the receiving unit is further configured to: receive the first DCI sent by the network device at or after the first time, where the first DCI includes DAI; where the first time is the first information For the Nth time unit after the sending moment, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the receiving unit is further configured to: receive the first DCI sent by the network device in a second time period after the first time, the first DCI does not include DAI; where the first time is the first The Nth time unit after the sending moment of an information, N is greater than or equal to 1, N is predefined or preconfigured, and the second time period is predefined, preconfigured, or the length of time indicated by the first information.
  • the receiving unit is further configured to: receive the first DCI sent by the network device in a second time period after the first time, where the first DCI includes DAI; wherein, the first time is the first The Nth time unit after the time when the information is sent, N is greater than or equal to 1, N is pre-defined or pre-configured, and the second time period is pre-defined, pre-configured, or the length of time indicated by the first information.
  • the first information is carried by MAC CE.
  • the eleventh aspect of the present application provides a communication device, which may be a terminal device or a chip system or an integrated circuit inside the terminal device.
  • the communication device includes: a receiving unit; the receiving unit is used to: receive a second DCI from a network device, the second DCI is used to schedule downlink transmission;
  • the first DCI from the network device, the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the time domain resource occupied by the second DCI
  • the mth time unit, m is a positive integer, 1 ⁇ m ⁇ M, and M is the number of time units occupied by the second DCI.
  • the communication device further includes a processing unit configured to demodulate the first DCI and/or the second DCI.
  • the receiving unit is further configured to receive downlink data from the network device.
  • the DAI is used to indicate codebook feedback for the downlink data or used to generate a codebook for the downlink data.
  • the receiving unit is further configured to receive the first DCI from the network device in a third time period before the second time, and the first DCI from the network device does not include DAI.
  • a twelfth aspect of the present application provides a communication device, which may be a terminal device or a chip system or an integrated circuit inside the terminal device.
  • the communication device includes: a receiving unit; the receiving unit is configured to: receive downlink data from a network device; receive a first DCI from the network device in a predefined or pre-configured time period after the second moment, and DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the t-th time unit in the time domain resources occupied by the downlink data, and t is a positive integer, 1 ⁇ t ⁇ T, T is the number of time units occupied by the downlink data; or, the second moment is the sth time unit in the time domain resources occupied by the feedback timing corresponding to the downlink data, s is a positive integer, 1 ⁇ s ⁇ S, S is the number of time units occupied by the feedback opportunity corresponding to the downlink data.
  • the communication device further
  • the receiving unit is further configured to receive the first DCI from the network device in a third time period before the second time, and the first DCI from the network device does not include DAI.
  • a thirteenth aspect of the present application provides a communication device, which includes: at least one processor and at least one memory, wherein operation instructions are stored in the memory, and the processor reads the operation instructions in the memory to implement the foregoing first aspect to the first aspect.
  • the method in any one of the three aspects.
  • the communication device includes at least one processor and an interface circuit, wherein the interface circuit is used to provide the at least one processor with input and/or output of information, and the at least one processor processes the information to
  • the communication device is enabled to implement the method in any one of the foregoing first aspect to the third aspect.
  • the information includes instructions and/or data.
  • the communication device may be a network device, or a chip system or an integrated circuit inside the network device.
  • a fourteenth aspect of the present application provides a communication device, including: at least one processor and at least one memory, wherein the memory stores operating instructions, and the processor reads the operating instructions in the memory to implement the foregoing fourth to first aspects.
  • the method in any one of the six aspects.
  • the communication device includes at least one processor and an interface circuit, wherein the interface circuit is used to provide the at least one processor with input and/or output of information, and the at least one processor processes the information to
  • the communication device is enabled to implement the method in any one of the foregoing fourth aspect to the sixth aspect.
  • the information includes instructions and/or data.
  • the communication device may be a terminal device, or a chip system or an integrated circuit inside the terminal device.
  • a fourteenth aspect of the present application provides a communication system, including: the communication device in the aforementioned thirteenth aspect and the communication device in the fourteenth aspect.
  • a fifteenth aspect of the present application provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method in any one of the first aspect to the sixth aspect.
  • the sixteenth aspect of the present application provides a computer program product, which when the computer program product runs on a computer, causes the computer to execute the method in any one of the first aspect to the sixth aspect.
  • This application provides a communication method and related equipment.
  • the DAI can be sent according to specific needs, and the load can be reduced to improve the reliability of downlink transmission. While ensuring the reliability of downlink transmission feedback.
  • FIG. 1 is a schematic diagram of HARQ-ACK feedback provided by an embodiment of this application.
  • FIG. 2 is a schematic diagram of DL-DAI application in a HARQ-ACK codebook provided by an embodiment of this application;
  • FIG. 3 is a schematic diagram of UL-DAI application in a HARQ-ACK codebook provided by an embodiment of this application;
  • FIG. 4 is a schematic flowchart of a communication method 400 provided by an embodiment of this application.
  • FIG. 5 is a schematic flowchart of a communication method 500 provided by an embodiment of this application.
  • FIG. 6 is a schematic diagram of a first time period indication method provided by an embodiment of the application.
  • FIG. 7 is a schematic flowchart of a communication method 700 provided by an embodiment of this application.
  • FIG. 8 is a schematic diagram of activation and deactivation of a network device according to an embodiment of the application.
  • FIG. 9 is a schematic diagram of activation and activation end according to an embodiment of the application.
  • FIG. 10 is a schematic diagram of activation and activation end according to an embodiment of the application.
  • FIG. 11 is a schematic flowchart of a communication method 1100 according to an embodiment of this application.
  • FIG. 12 is a schematic diagram of indicating that the first DCI includes DAI through the second DCI according to an embodiment of the application;
  • FIG. 13 is a schematic flowchart of a communication method 1300 provided by an embodiment of this application.
  • FIG. 14 is a schematic structural diagram of a network device 1400 according to an embodiment of the application.
  • FIG. 15 is a schematic structural diagram of a terminal device 1500 according to an embodiment of the application.
  • FIG. 16 is a schematic structural diagram of a communication device 1600 according to an embodiment of the application.
  • the naming or numbering of steps appearing in this application does not mean that the steps in the method flow must be executed in the time/logical sequence indicated by the naming or numbering.
  • the named or numbered process steps can be implemented according to the The technical purpose changes the execution order, as long as the same or similar technical effects can be achieved.
  • the division of units presented in this application is a logical division. In actual applications, there can be other divisions. For example, multiple units can be combined or integrated in another system, or some features can be ignored , Or not to execute, in addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection between the units may be electrical or other similar forms. There are no restrictions in the application.
  • the units or subunits described as separate components may or may not be physically separate, may or may not be physical units, or may be distributed to multiple circuit units, and some or all of them may be selected according to actual needs. Unit to achieve the purpose of this application program.
  • the data sent by the network device to the terminal device is also called downlink data.
  • the downlink data can usually be carried by the physical downlink shared channel (PDSCH); the control information sent by the base station is also called downlink control information (downlink control information).
  • control information, DCI DCI
  • DCI can usually be carried by a physical downlink control channel (PDCCH).
  • the data sent by the terminal device to the network device is also called uplink data.
  • the uplink data can usually be carried by the physical uplink shared channel (PUSCH); the control information sent by the terminal device to the network device is also called uplink control information.
  • UCI uplink control information
  • UCI can usually be carried through a physical uplink control channel (PUCCH).
  • the process of "network equipment sending downlink data to terminal equipment through PDSCH” can be referred to simply as “network equipment sending PDSCH to terminal equipment", that is, the PDSCH can be understood as downlink data sent by network equipment to terminal equipment.
  • the aforementioned PUSCH can also be understood as the uplink data sent by the terminal device to the network device.
  • the NR communication system supports a hybrid automatic repeat request (HARQ) mechanism.
  • HARQ hybrid automatic repeat request
  • the terminal device will feedback whether the PDSCH is received correctly in the uplink feedback opportunity corresponding to the PDSCH, that is, perform HARQ acknowledgement (HARQ-acknowledgement, HARQ-ACK) feedback.
  • the terminal device may feed back HARQ-ACK information corresponding to one or more PDSCHs in the same uplink feedback opportunity.
  • the terminal device can encode multiple HARQ-ACK bits according to predefined rules to generate a HARQ-ACK codebook; then, the terminal device transmits the HARQ-ACK codebook in the uplink feedback opportunity, thereby realizing HARQ-ACK Feedback.
  • the uplink feedback opportunity may be PUCCH.
  • the terminal device also sends the PUSCH at the same time in the uplink feedback opportunity, the HARQ-ACK codebook may also be carried in the PUSCH and sent, and the terminal device will feedback whether the PDSCH reception is correct or not in the PUSCH.
  • FIG. 1 is a schematic diagram of HARQ-ACK feedback according to an embodiment of the application.
  • the network device sends PDSCH1 and PDSCH2 to the terminal device, and the network device also sends to the terminal device a downlink (DL) DCI1 for scheduling PDSCH1 and a DL-DCI2 for scheduling PDSCH2.
  • DL-DCI1 and DL-DCI2 both indicate that the terminal device feeds back the HARQ-ACK of the PDSCH in the same uplink feedback opportunity.
  • the network device also sends uplink (UL) DCI for scheduling uplink transmission (such as PUSCH) to the terminal device, and the PUSCH scheduled by the UL-DCI overlaps with the foregoing uplink feedback timing in time. Therefore, the terminal device carries the HARQ-ACK codebook corresponding to PDSCH1 and PDSCH2 in the PUSCH.
  • UL uplink
  • PUSCH scheduling uplink transmission
  • the network device can instruct the terminal device to perform uplink transmission by sending the UL-DCI to the terminal device, so that the terminal device sends the uplink data through the PUSCH based on the UL-DCI instruction.
  • This process can generally be referred to as "network equipment scheduling PUSCH through UL-DCI", and the UL-DCI can be referred to as UL-DCI for scheduling PUSCH.
  • the process of instructing the terminal equipment to receive the PDSCH by the network equipment by sending DL-DCI to the terminal equipment can be referred to as "the network equipment scheduling PDSCH through DL-DCI", and the DL-DCI can be referred to as being used for scheduling PSDCH DL-DCI.
  • the terminal device feeds back the HARQ-ACK codebook on the PUSCH, and the 2 bits of the HARQ-ACK codebook respectively correspond to the feedback of PDSCH1 and PDSCH2.
  • the terminal device correctly receives PDSCH1, so the value of the bit corresponding to PDSCH1 in the HARQ-ACK codebook is "1"; the terminal device does not correctly receive PDSCH2, and the bit corresponding to PDSCH2 in the HARQ-ACK codebook is taken The value is "0", and the final HARQ-ACK codebook value is "10".
  • the HARQ-ACK codebook fed back by the terminal equipment at a certain uplink feedback opportunity is based on the number of PDSCHs actually received in the downlink reception time corresponding to the uplink feedback opportunity and whether It is generated by receiving the PDSCH correctly.
  • the HARQ-ACK codebook fed back by the terminal equipment at a certain uplink feedback opportunity is based on the number of all PDSCHs that may be received in the downlink reception time corresponding to the feedback opportunity and whether It is generated when the PDSCH is received correctly.
  • one uplink feedback opportunity corresponds to 4 possible PDSCH reception opportunities
  • the terminal device only receives the PDSCH in the first 2 PDSCH reception opportunities among the 4 PDSCH reception opportunities, and there is only the first PDSCH in these 2 PDSCH reception opportunities.
  • One PDSCH is received correctly, and the decoding of the second PDSCH fails.
  • specific examples of dynamic HARQ-ACK codebook feedback and semi-static HARQ-ACK codebook feedback are as follows:
  • the HARQ-ACK codebook generated by the terminal device is "10".
  • the HARQ-ACK codebook "10" indicates that the terminal device has received 2 PDSCHs, and the first PDSCH is received correctly, and the second PDSCH is not received correctly.
  • the HARQ-ACK codebook generated by the terminal device is "1000".
  • the HARQ-ACK codebook "1000" means that the terminal device only correctly received the first PDSCH out of the 4 possible received PDSCHs, but did not correctly receive the PDSCH at the other three possible times. PDSCH.
  • the network device can configure the HARQ-ACK codebook feedback mode of the terminal device through RRC signaling, and schedule the terminal device through a specific DCI. specifically:
  • the DL-DCI includes a downlink assignment index (downlink assignment index, DAI).
  • DAI downlink assignment index
  • This DAI can be called DL-DAI and is used to indicate the specific PDSCH scheduled by the current DL-DCI It is the PDSCH scheduled for the terminal equipment.
  • DL-DAI usually includes at least one of count DAI (counter DAI, C-DAI) and total DAI (total DAI, T-DAI), where C-DAI indicates that the current PDCCH detection opportunity (PDCCH monitoring occasion) is in this case.
  • the PDSCH count in a cell or carrier, and T-DAI indicates the PDSCH count in all cells or carriers as of the current PDCCH detection opportunity.
  • DL-DAI can be used to assist the terminal device in generating the HARQ-ACK codebook. Based on DL-DAI, the terminal device can generate the HARQ-ACK codebook more accurately.
  • the explanation about the PDCCH detection timing can refer to the existing technologies and standards.
  • FIG. 2 is a schematic diagram of DL-DAI application in a HARQ-ACK codebook provided by an embodiment of this application.
  • the terminal device correctly receives PDSCH1 and PDSCH2, and the DAI corresponding to PDSCH1 and PDSCH2 are 00 and 01 respectively, which means that PDSCH1 and PDSCH2 are the first PDSCH and the second PDSCH, respectively. Therefore, the terminal device can generate a 2-bit HARQ-ACK codebook "11".
  • the terminal device correctly receives PDSCH1 and PDSCH3, and the DAI corresponding to PDSCH1 and PDSCH3 are 00 and 10, respectively, which means that PDSCH1 and PDSCH3 are the first PDSCH and the third PDSCH, respectively.
  • the terminal device can determine that a PDSCH is missed between PDSCH1 and PDSCH3. Therefore, the terminal device can generate a 3-bit HARQ-ACK codebook "101", where "0" means The terminal device failed to receive the second PDSCH correctly.
  • a DAI may also be included in the UL-DCI, and the DAI may be referred to as UL-DAI.
  • the DAI included in the DCI used for scheduling uplink transmission is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data.
  • the DAI is used to indicate codebook feedback for downlink data
  • the DAI is used to indicate whether to perform codebook feedback for the downlink data.
  • the DAI may be used to indicate to the terminal device the PDSCH counts in all cells or carriers corresponding to the same feedback opportunity.
  • the DAI is used by the terminal device to generate a HARQ-ACK codebook for the downlink data.
  • FIG. 3 is a schematic diagram of UL-DAI application in a HARQ-ACK codebook provided by an embodiment of this application.
  • the terminal device correctly receives PDSCH1 and PDSCH3, and the DAI corresponding to PDSCH1 and PDSCH3 are 00 and 10 respectively, which means that PDSCH1 and PDSCH3 are the first PDSCH and the third PDSCH, respectively, so the terminal device can It is determined that a PDSCH is still missed between the two PDSCHs; and the terminal device has a value of 11 in the UL-DCI received by the terminal device, so the terminal device can further determine that it has missed detection after PDSCH3 One PDSCH4.
  • the terminal device can generate a 4-bit HARQ-ACK codebook "1010", where "0" indicates that the terminal device failed to correctly receive the second PDSCH and the fourth PDSCH.
  • UL-DCI often includes UL-DAI.
  • UL-DAI is used to assist the terminal device in correctly generating the HARQ-ACK codebook.
  • the semi-static HARQ-ACK codebook is used for feedback, UL-DAI is used to indicate whether the terminal device can carry the HARQ-ACK codebook in the PUSCH for transmission. That is, the DAI included in the DCI used for scheduling uplink transmission is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data.
  • the DAI is used to indicate codebook feedback for downlink data
  • the DAI is used to indicate whether to perform codebook feedback for the downlink data.
  • the DAI can be used for the terminal device to generate a dynamic HARQ-ACK codebook or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook in the PUSCH for transmission.
  • the DAI may be used to indicate to the terminal device the PDSCH count in one cell or carrier corresponding to the same feedback opportunity, or the PDSCH count in all cells or carriers corresponding to the same feedback opportunity. It should be noted that the explanation of the DAI included in the DCI used for scheduling uplink transmission mentioned in the embodiment of the present application can refer to the definition in this paragraph.
  • the UL-DCI needs to include the UL-DAI.
  • a reduced capability (REDCAP) terminal device is supported in the NR communication system.
  • Typical application scenarios of the REDCAP terminal device include sensors and video surveillance.
  • REDCAP terminal equipment often needs to upload a large amount of interception data and monitoring data.
  • the wireless transmission service of REDCAP terminal equipment is mainly upstream transmission service, that is, REDCAP terminal equipment corresponds to more PUSCHs.
  • REDCAP terminal equipment has less or no PDSCH. This leads to the fact that the DAI in the UL-DCI sent to the REDCAP terminal device is redundant most of the time.
  • the more UL-DCI load that is, the number of bits of UL-DCI
  • the worse the transmission reliability the less the UL-DCI load, the lower the transmission reliability.
  • the higher the reliability In other words, always including useless UL-DAI in the UL-DCI not only does not improve the accuracy of the HARQ-ACK feedback corresponding to the PDSCH, but also reduces the transmission reliability of the UL-DCI.
  • the embodiments of the present application provide a communication method and related equipment, by indicating to the terminal equipment whether the downlink control information used for scheduling uplink transmission includes DAI information, so as to realize the transmission of DAI according to specific needs to improve The reliability of downlink transmission is guaranteed while the reliability of downlink transmission feedback is guaranteed.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency-division multiple access
  • SC-FDMA single carrier frequency-division multiple access
  • LTE long term evolution
  • 5G fifth generation
  • NR new radio
  • the communication system may also be applicable to future-oriented communication technologies, all of which are applicable to the technical solutions provided in the embodiments of the present application.
  • the system architecture and business scenarios described in the embodiments of this application are to illustrate the technical solutions of the embodiments of this application more clearly, and do not constitute a limitation on the technical solutions provided in the embodiments of this application.
  • Those of ordinary skill in the art will know that with the network With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.
  • the application scenario includes a terminal device 101 and a network device 102.
  • the terminal device 101 is wirelessly connected to the network device 102, and the network device 102 is used to connect the terminal device 101 to the wireless network.
  • the terminal device 101 is also called user equipment (UE), mobile station (MS), mobile terminal (mobile terminal, MT), etc., which provide users with voice and/or data connectivity.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • Devices such as handheld devices and in-vehicle devices that allow wireless connectivity.
  • terminal devices are: mobile phones (mobile phones), tablets, notebook computers, palmtop computers, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented Augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, and smart grid (smart grid)
  • the network device 102 may be any device with a wireless transceiver function.
  • the network equipment 102 includes, but is not limited to: base stations (such as base stations BS, base stations NodeB, evolved base stations eNodeB or eNB, base stations gNodeB or gNB in the fifth generation 5G communication system, base stations in future communication systems, and access in WiFi systems Nodes, wireless relay nodes, wireless backhaul nodes), etc.
  • the base station may be: a macro base station, a micro base station, a pico base station, a small station, a relay station, etc. Multiple base stations can support the network of one or more technologies mentioned above, or the future evolution network.
  • the base station may include one or more co-site or non co-site transmission reception points (TRP).
  • TRP co-site or non co-site transmission reception points
  • the network device 102 may also be a wireless controller, a centralized unit (CU), or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the following takes the network device 102 as a base station as an example for description.
  • the multiple network devices 102 may be base stations of the same type, or base stations of different types.
  • the base station can communicate with the terminal device 101, and can also communicate with the terminal device 101 through a relay station.
  • the terminal device 101 can support communication with multiple base stations of different technologies.
  • the terminal device 101 can support communication with a base station that supports an LTE network, can also support communication with a base station that supports a 5G network, and can also support communication with a base station that supports an LTE network.
  • the terminal device 101 is connected to the RAN node of the wireless network.
  • RAN nodes are: gNB, TRP, evolved Node B (evolved Node B, eNB), next generation evolved Node B (LTE ng-eNB), radio network controller (radio network controller (RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B) , HNB), baseband unit (BBU), or Wifi access point (access point, AP), etc.
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • BTS base transceiver station
  • HNB home evolved NodeB, or home Node B
  • BBU baseband unit
  • Wifi access point access point, AP
  • the communication method 400 includes:
  • the network device sends first information to a terminal device, where the first information indicates that the first DCI includes or does not include DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format.
  • the terminal device receives the first information. Further, the terminal device determines that the first DCI includes DAI according to the first information, or the terminal device determines that the first DCI does not include DAI according to the first information.
  • the first DCI is DCI used to schedule uplink transmission of the terminal device, for example, the first DCI is DCI used to schedule PUSCH, that is, the first DCI is UL-DCI.
  • the DAI included in the first DCI is UL-DAI.
  • the first DCI is at least one DCI in the first format, that is, the first DCI refers to one or more DCIs in the same format.
  • first DCI is used uniformly to indicate multiple DCIs with the same format.
  • the DAI is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data. That is, before step 401, the method may further include: the network device sends the downlink data to the terminal device.
  • the downlink data may be at least one PDSCH.
  • the DAI is used for the terminal device to generate the HARQ-ACK codebook for the downlink data or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook in the PUSCH and sends it.
  • the format of the first DCI is the first format
  • the first format may be any of DCI format 0_0 (DCI format0_0), DCI format 0_1 (DCI format0_1), or DCI format 0_2 (DCI format0_2) .
  • the DCI format 0_0, the DCI format 0_1, and the DCI format 0_2 are the formats defined for the DCI used for scheduling uplink transmission in the NR communication system.
  • the first format may also be a DCI format used for scheduling uplink transmission in other possible communication systems or may also be another DCI format different from the foregoing format, and this embodiment does not limit the first format.
  • the inclusion of DAI in the first DCI may mean that the number of DAI bits in the first DCI is not 0, and the excluding of DAI in the first DCI may mean that the number of DAI bits in the first DCI is 0 or the first
  • the field originally used to indicate DAI in the DCI is used to indicate other information, that is, the first information can indicate the first DCI by indicating that the number of DAI bits in the first DCI is 0 or the number of DAI bits in the first DCI is not 0.
  • DCI does not include DAI or includes DAI.
  • the first information may indicate whether DAI is included in the first DCI through a specific field.
  • a 1-bit field may be used in the first information to indicate that the first DCI includes DAI or does not include DAI. For example, when the 1-bit field takes the value "0", the first information indicates the first The DCI does not include DAI; when the 1-bit field has a value of "1", the first information indicates that the first DCI includes DAI.
  • a 1-bit field may also be used to indicate that the terminal is in the first state or the second state.
  • the first information indicates The terminal device is in the first state; when the 1-bit field has a value of "1", the first information indicates that the terminal device is in the second state.
  • the terminal device being in the first state corresponds to not including DAI in the first DCI
  • the terminal device being in the second state corresponds to including DAI in the first DCI. Therefore, the terminal device can determine whether DAI is included in the first DCI based on the state indicated by the first information.
  • a 1-bit field may also be used to indicate whether the number of DAI bits in the first DCI is 0.
  • the first A piece of information indicates that the number of DAI bits in the first DCI is 0; when the 1-bit field has a value of "1", the first piece of information indicates that the number of DAI bits in the first DCI is not 0.
  • the number of DAI bits in the first DCI being 0 corresponds to not including DAI in the first DCI
  • the number of DAI bits in the first DCI being not 0 corresponds to including DAI in the first DCI. Therefore, the terminal device can also determine whether DAI is included in the first DCI based on the number of bits of DAI in the first DCI indicated by the first information.
  • the first information may be used to indicate at least one of whether the first DCI does not include DAI, the number of bits of DAI in the first DCI is 0, or the terminal device is in the first state.
  • the terminal device in different communication environments, the terminal device may be in different states.
  • the terminal device may correspond to multiple states, the first state may be one or more states, and the second state may also be one or more states.
  • the network device may send to the terminal device first information indicating that the terminal device is in the first state to instruct the terminal device to enter the first state.
  • the terminal device may not need to use the UL-DAI in the UL-DCI.
  • the terminal device determines that the first DCI does not include DAI, that is, the terminal device in the first state corresponds to the absence of the first DCI. Including DAI.
  • the network device may send to the terminal device first information indicating that the terminal device is in the second state, so as to instruct the terminal device to enter the second state.
  • the terminal device may need to use the UL-DAI in the UL-DCI to correctly generate the HARQ-ACK codebook or determine whether the HARQ-ACK codebook can be carried in the PUSCH for transmission, the terminal The device may determine that the first DCI includes DAI, that is, the terminal device being in the second state corresponds to including DAI in the first DCI.
  • the terminal device being in the first state may specifically be that the terminal device is in a preset mode (mode), for example, the terminal device is in mode 1, which may be preset or preset at the factory.
  • mode a preset mode
  • the terminal device is configured during use. When the terminal device is in mode 1, the terminal device has no downlink data transmission or only a small amount of downlink data transmission, and the terminal device may not need to use the UL-DAI in the UL-DCI.
  • the terminal device When the terminal device is in the second state, the terminal device may be in another preset mode, for example, the terminal device is in mode 2.
  • the mode 2 can also be preset at the factory or the terminal device. Configured during use.
  • the terminal device When the terminal device is in mode 2, the terminal device has downlink data transmission, the terminal device needs to correctly generate the dynamic HARQ-ACK codebook based on UL-DAI in UL-DCI, or the terminal device needs to be based on the UL in UL-DCI -DAI determines whether the semi-static HARQ-ACK codebook can be carried in the PUSCH for transmission.
  • the network device can determine whether to send the first information to the terminal device according to the downlink data transmission situation corresponding to the terminal device in the next time.
  • the network device can send the first information to the terminal device, and the first information is used to indicate that the first DCI does not include DAI, so as to indicate the first DCI to the terminal device Does not include DAI.
  • the network device may send the first information (or other information) to the terminal device, and the other information is used to indicate that the first DCI (or other DCI of the same type as the first DCI) includes DAI to indicate to the terminal device that the first DCI includes DAI.
  • first information for the indication that the first DCI does not include or includes DAI, but it does not mean that the same piece of “first information” can indicate that the first DCI includes DAI and It may indicate that the same first DCI does not include DAI.
  • first information the same piece of “first information” can indicate that the first DCI includes DAI and It may indicate that the same first DCI does not include DAI.
  • second piece of “first information” needs to be used to indicate that the other one or more first DCIs include corresponding DAI.
  • the format of the foregoing first DCI is the same, for example, the first format.
  • the same expressions of "first DCI" and "first information” issued multiple times are reused for the purpose of simplifying the solution.
  • the network device may send the first information to the terminal device in multiple ways.
  • Manner 1 The network device sends an RRC message to the terminal device, and the first information is carried in the RRC message, that is, the network device configures the first information for the terminal device through the RRC message.
  • Manner 2 The network device sends the MAC CE to the terminal device, and the first information is carried in the MAC CE.
  • a certain field may be used to indicate the first information in the RRC message or MAC CE.
  • the field is predefined or pre-defined, and the value of this field may be used to indicate that the first DCI includes DAI It either does not include DAI, or indicates that the terminal device is in the first state or the second state, or indicates whether the number of DAI bits in the first DCI is 0.
  • the specific correspondence between the value of this field and the content indicated by the field can be referred to above, and will not be repeated here.
  • the field used to indicate the first information in the RRC message or MAC CE may be one or more, and the correspondence between the value of the field and the content indicated by the field may also be in the manner as exemplified above. It may also be in other manners, which is not specifically limited in this embodiment.
  • the network device sends the first DCI to the terminal device.
  • the terminal device receives the first DCI.
  • the terminal device demodulates the first DCI according to the first information.
  • the network device when the first information sent by the network device to the terminal device indicates that the first DCI includes DAI, the network device generates the first DCI including DAI and sends the first DCI to the terminal device, that is, the network device The one or more DCIs in the first format sent to the terminal device all include DAI.
  • the first information indicates that the first DCI does not include DAI
  • the first DCI sent by the network device to the terminal device does not include DAI, that is, the format sent by the network device to the terminal device is one or one of the first formats. DAI is not included in multiple DCIs.
  • the terminal device When the terminal device demodulates the received DCI, the terminal device needs to know the number of DCI bits to be able to demodulate the DCI correctly. Otherwise, the terminal device cannot demodulate correctly without knowing the number of DCI bits.
  • DCI. Correctly demodulating the DCI can be understood as successfully demodulating and decoding the PDCCH, and can also further include correct interpretation of the information carried by the DCI. Therefore, in this embodiment, the network device indicates whether DAI is included in the first DCI by sending the first information to the terminal device, which can ensure that the terminal device can determine the number of bits of the first DCI in time, thereby ensuring that the terminal device can correctly resolve Tunes the first DCI received.
  • the terminal device may determine the number of bits of the first DCI according to the content indicated by the first information.
  • the terminal device can demodulate the received first DCI based on the 52 bits of the first DCI; if the first information indicates the first If the DCI does not include DAI, it is determined that the number of bits of the first DCI is 50, and the terminal device may demodulate the received first DCI based on the first DCI having 50 bits.
  • the terminal device After receiving the first information indicating that the first DCI includes DAI, the terminal device may receive the first DCI from the network device, and demodulate the first DCI to obtain the DAI in the first DCI.
  • the terminal device when the terminal device adopts the dynamic HARQ-ACK codebook feedback mode, after receiving the PDSCH, the terminal device can generate the HARQ-ACK codebook based on the DAI obtained by demodulating the first DCI, and corresponding to the PDSCH The generated HARQ-ACK codebook is fed back in the uplink feedback timing of.
  • the terminal device can determine whether to carry the HARQ-ACK codebook into the PUSCH based on the DAI obtained by demodulating the first DCI after receiving the PDSCH Send, and feed back the generated HARQ-ACK codebook in the uplink feedback opportunity corresponding to the PDSCH.
  • the network device sends to the terminal device first information indicating that the first DCI includes DAI and the first DCI including DAI, so that The terminal device correctly demodulates the received first DCI and obtains the DAI, ensuring that the terminal device can accurately generate the HARQ-ACK codebook based on the demodulated DAI or determine whether to carry the HARQ-ACK codebook to the PUSCH for transmission, Thereby ensuring the reliability of downlink transmission feedback.
  • the number of PDSCHs that need to be HARQ-ACK feedback received by the terminal device is less than or equal to 1
  • the network device sends to the terminal device first information indicating that the first DCI does not include DAI, and the first DCI sent by the network device does not include DAI.
  • the first DCI sent by the network device does not include DAI, that is, the number of first DCI bits is reduced, which improves the transmission reliability of the first DCI; and the terminal device can still demodulate and receive correctly based on the instructions of the first information. To the first DCI.
  • the terminal device does not need to perform HARQ-ACK feedback, nor does it need to use DAI; there is only a small amount of downlink data transmission between the network device and the terminal device
  • the HARQ-ACK codebook that the terminal device needs to feed back is relatively simple, and the terminal device does not need to be based on DAI to correctly determine the HARQ-ACK codebook. That is to say, in this embodiment, by indicating to the terminal device whether the downlink control information used for scheduling uplink transmission includes DAI information, the DAI transmission is realized according to specific needs, so as to improve the reliability of downlink transmission while ensuring downlink transmission. Reliability of transmission feedback.
  • the main flow of the communication method has been introduced above, and the first method of sending the first information by the aforementioned network device will be further introduced below based on the aforementioned embodiment.
  • the communication method 500 includes:
  • a network device sends an RRC message to a terminal device, where the RRC message carries first information.
  • the terminal device obtains the first information carried in the RRC message.
  • the network device sends the first information to the terminal device by sending an RRC message to the terminal device and carrying the first information in the RRC message.
  • the first information indicates that the first DCI includes or does not include DAI
  • the first DCI is used for scheduling uplink transmission
  • the format of the first DCI is the first format.
  • the DAI is used to indicate codebook feedback for downlink data or is used to generate a codebook for downlink data, where the DAI is used to indicate that the codebook feedback for downlink data includes the DAI for indicating whether Perform codebook feedback for the downlink data. That is, before step 501, the method may further include: the network device sends the downlink data to the terminal device.
  • the downlink data may be at least one PDSCH.
  • the DAI is used for the terminal device to generate the HARQ-ACK codebook for the downlink data or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook in the PUSCH and sends it.
  • step 501 For the first information and the first DCI involved in step 501, please refer to the related introduction in step 401 for details, which will not be repeated here.
  • first information for the indication that the first DCI does not include or includes DAI, but it does not mean that the same piece of “first information” can indicate that the first DCI includes DAI and It may indicate that the same first DCI does not include DAI.
  • first information the same piece of “first information” can indicate that the first DCI includes DAI and It may indicate that the same first DCI does not include DAI.
  • second piece of “first information” needs to be used to indicate that the other one or more first DCIs include corresponding DAI.
  • the format of the foregoing first DCI is the same, for example, the first format.
  • the same expressions of "first DCI" and "first information” issued multiple times are reused for the purpose of simplifying the solution.
  • the first information carried by the RRC message may indicate whether DAI is included in the first DCI in multiple ways.
  • Manner 1 The first information directly indicates that the first DCI includes DAI or the first DCI does not include DAI.
  • the first information in the RRC message can be defined as transmission control (TransControl) information
  • the TransControl information includes ulDaiInclude sub-information
  • ulDaiInclude sub-information is a Boolean binary variable, and its value can be ⁇ One of true, false ⁇ .
  • ulDaiInclude is true, it means that DAI is included in the first DCI, and when the value is false, it means that DAI is not included in the first DCI.
  • TransControl information is as follows:
  • the indication of the first information may always be effective until the network device performs RRC reconfiguration on the terminal device through the RRC message.
  • the network device sends an RRC message 1 to the terminal device, and the RRC message 1 includes the first information.
  • the first information indicates that the first DCI does not include DAI
  • the first information indicates that the first DCI including DAI will always take effect, that is, the terminal device can consider None of the first DCI received after the first information includes DAI.
  • the terminal device may It is considered that the first DCI received after acquiring the second information all includes DAI.
  • the terminal device can determine the current or next time based on the indication information in the RRC message. Whether the first DCI includes DAI, and the indication of the indication information will always take effect until the terminal device receives indication information with other indication content.
  • the first time indication information is used to indicate the time period in which DAI is not included in the first DCI or the time period in which DAI is included in the first DCI.
  • the first time indication information is used to indicate the time period in which DAI is included or not included in the first DCI, so that the terminal device can determine according to the first time indication information in which time periods the received first DCI includes DAI and the time period during which the first DCI received does not include DAI. For example, in a case where the first time indication information indicates that time period 1 is a time period in which DAI is not included in the first DCI, the terminal device may determine that DAI is not included in the first DCI received in time period 1, but in time period 1 DAI is included in the first DCI received at other times other than segment 1.
  • the terminal device may determine that the first DCI received in time period 2 includes DAI, and that DAI is included in time period 2 DAI is not included in the first DCI received at other times.
  • the first time indication information may be included in the first information, that is, the first information includes the first time indication information for indicating the first time period. In this case, the first time indication information is included in the first time period.
  • the information is sent by the network device to the terminal device.
  • the first time indication information may also be other information not included in the first information.
  • the network device can carry the first time indication information through the RRC message and send it to the terminal device.
  • the first time indication information may be specifically used to indicate the first time period; correspondingly, the first information may also be used to indicate: in the first DCI in the first time period Does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first DCI located in the first time period includes DAI, or, in the first time period, the terminal device is in the second state state. That is to say, the first time period may be indicated in the first time indication information, and the first time period is a time period that includes or does not include DAI in the first DCI, or the first time period indicates that the terminal device is in the first time period. The time period of the state or the second state. Based on the first time indication information and the first information, the terminal device may determine whether DAI is included in the first DCI received in the first time period.
  • the first time period can be indicated in multiple ways.
  • the first time indication information is used to indicate one or more of cycle duration, time offset, and duration.
  • the first time indication information may include one or more of the cycle duration, time offset, and duration, and the terminal device is based on the cycle duration, time offset, and/or time included in the first time indication information.
  • duration to determine the first time period may include information used to determine one or more of the period duration, the time offset, and the duration.
  • FIG. 6, is a schematic diagram of a first time period indication method provided by an embodiment of the application. As shown in Fig.
  • a plurality of periodic first time periods can be determined based on the period length, time offset, and duration.
  • the time intervals between the first time periods are the same, and in these first time periods with periodicity, the first DCI does not include DAI.
  • the aforementioned period duration is the length of time between any two adjacent first time periods, that is, the period duration is the period of the first time period; the aforementioned duration is the duration of each first time period;
  • the aforementioned time offset is the offset between the start time of any one of the first time periods and the start time of the period in which the first time period is located; or, the time offset is the end time of the first time period and the The offset of the end time of the period in which the first time period is located.
  • the time within a certain range can be divided according to the aforementioned period length, so as to obtain multiple periods with the same period length.
  • the first time period is a time period in each cycle, and the duration of the time period is the duration of the first time period. Based on the aforementioned time offset, the position of the first time period in the cycle can be determined.
  • the cycle duration of each cycle Both are 1 hour.
  • the duration corresponding to the first time period is 5 minutes
  • the time offset is the offset between the start time of the first time period and the start time of the period in which the first time period is located, and the time offset is 10 Minutes, it can be determined that in each cycle, the first time period is the time period from the 10th minute to the 15th minute in each cycle.
  • the unit of measurement is hour and minute as an example, and the period length, time offset, and duration are described.
  • the measurement unit of the aforementioned period duration, time offset, and duration may be a measurement unit such as a radio frame (frame), a subframe (subframe), and a time slot (slot), or may be seconds, minutes, Other measurement units such as time can be determined or adjusted according to actual conditions, and this implementation does not specifically limit this.
  • the measurement units used for the period duration, time offset, and duration may be the same or different.
  • the cycle duration, time offset, and duration may all be in minutes; for example, the cycle duration may be in units of radio frames, while the time offset and duration are in units of time slots, etc. In this implementation No longer.
  • the first time period is specifically determined by the cycle duration, time offset, and duration.
  • the first time indication information may include cycle duration, time offset, and duration.
  • the first time indicates The information may also include one or two of cycle duration, time offset, and duration.
  • the terminal device is not based on the first information
  • the first time indication information may include the remaining two or one of the cycle duration, time offset, and duration.
  • the first time indication information may only include the time offset and duration. After the terminal device receives the first time indication information, it may be based on the time in the first time indication information.
  • the offset and duration, as well as the pre-defined period duration determine the first time period.
  • the first time period may also be determined based on a mapping relationship between the first time period and one or more time periods.
  • the first time period has a mapping relationship with one or more time periods, that is, the first time period can be represented by one or more time periods, and in the first time indication information, the first time period can be indicated by One or more time periods of the mapping relationship indicate the first time period.
  • mapping relationship between the first time period and one or more time periods may be as shown in Table 1:
  • the time range corresponding to the first time period can be directly determined.
  • the terminal device can determine based on the mapping relationship in Table 1 at 0:10 to 0:15, 1:10 to 1:15, 2:10 to 2:15, and 3:10 to 3.
  • the time period such as hour 15 minutes is the first time period.
  • the first time period and its corresponding multiple specific time periods are shown in Table 1, that is, the first time period corresponding to the first time period is indicated in the first time indication information. Specific time period.
  • the first time indication information is defined as transmission time (TransTime) information, which includes PeriodAndOffset sub-information and duration sub-information, where the value of Period AndOffset sub-information indicates the period duration and time offset, and the duration sub-information
  • the value indicates the duration; for example, if the value of the PeriodAndOffset sub-information is 500 in ms1000, it means that the period of the first time period is 1000ms and the time offset is 500ms; the value of the duration sub-information is ms100, which means The duration of the first time period is 100ms:
  • 0 o’clock to 23 o’clock are represented by letters A to X (for example, A means 0 o’clock, B means 1 o’clock, X means 23 o’clock, etc.), and every hour in each hour 5 minutes are represented by the numbers 1-12 (for example, 1 means the 0th minute to the 5th minute, 2 means the 5th minute to the 10th minute, and 12 means the 55th minute to the 60th minute).
  • the first time indication information indicates one or more time periods corresponding to the first time period
  • the number of the one or more time periods can be directly indicated, and the terminal device is based on the time indicated by the first time indication information.
  • the segment number can determine one or more time segments corresponding to the first time segment.
  • mapping relationship between the first time period and one or more time periods may be as shown in Table 2:
  • the terminal device can determine the time from 0:10 to 0:15, 1:10 to 1:15, 2:10 to 2:15, and 3:10 to 3:00
  • the 15-point time period is the first time period.
  • the first time indication information is defined as TransTime information, which includes PeriodAndDuration sub-information.
  • the value of the PeriodicityAndDuration sub-information indicates the period duration and the time belonging to the first period of time in a period; for example, the period of the PeriodAndDuration sub-information If the value is ms100 and the corresponding bitmap is "0100100000", it means that in the 100ms cycle, the second 10ms (10-20ms) and the fifth 10ms (40-50ms) belong to the first period:
  • the number of bits used to indicate the first time period in the first information can be reduced, and the resource overhead for transmitting the first information can be reduced.
  • the first time indication information may be included in the first information as sub-information of the first information, or may not be included in the first information.
  • the manner in which the first information includes the first time indication information may be:
  • the network device may also indicate to the terminal device that the first DCI includes/ The time period of DAI is not included.
  • the time period in which the DAI is included (or not included) in the first DCI indicated to the terminal device by the network device through other information may take effect at the same time as the aforementioned first time period. That is to say, the time periods during which the DAI is included/not included in the first DCI indicated by the network device to the terminal device through different information may be valid at the same time.
  • the terminal device may determine the actual time when DAI is not included in the first DCI according to the time period indicated by the network device through various information. For example, the terminal device may take the union of the time periods in which DAI is not included in the multiple first DCIs indicated by the network device, so as to obtain the actual time in which DAI is not included in the first DCI.
  • the network device sends an RRC message 1 to the terminal device.
  • the RRC message 1 is used to indicate that the time period 1 is a time period in which DAI is not included in the first DCI; the network device also sends an RRC message 2 to the terminal device.
  • the RRC message 2 is used to indicate that the time period 2 is a time period that does not include DAI in the first DCI; then the terminal device can determine based on the RRC message 1 and RRC message 2 that the time period composed of the time period 1 and the time period 2 is not included in the first DCI. Including the time of DAI.
  • the network device may send multiple sets of "period duration, time offset" to the terminal device. And the configuration combination of duration". After determining the time period corresponding to each configuration combination based on different configuration combinations, the terminal device may obtain the union between the time periods corresponding to the different configuration combinations, and finally determine the time when the first DCI includes/not includes DAI.
  • the network device sends the first DCI to the terminal device.
  • the terminal device receives the first DCI.
  • the terminal device demodulates the first DCI according to the first information.
  • Step 502 is similar to the aforementioned step 402. For details, reference may be made to the description of step 402, which will not be repeated here.
  • the network device configures the terminal device with first information by means of an RRC message indicating whether the first DCI includes DAI, or indicates whether the first DCI includes/does not include DAI. Therefore, the terminal device can determine whether DAI is included in the subsequent received first DCI, which improves the flexibility of solution implementation.
  • the first method of sending the first information by the aforementioned network device in the embodiment shown in FIG. 5 has been described in detail above, and the second method of sending the first information by the aforementioned network device will be further introduced below.
  • the communication method 700 includes:
  • a network device sends first information to a terminal device. Specifically, the first information is carried by MAC CE. Correspondingly, the terminal device receives the first information.
  • the first information indicates that the first DCI includes or does not include DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format.
  • the DAI is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data. Specifically, the DAI is used to indicate codebook feedback for downlink data, and the DAI is used to indicate whether to perform codebook feedback for downlink data.
  • the method may further include: the network device sends the downlink data to the terminal device.
  • the downlink data may be at least one PDSCH.
  • the DAI is used for the terminal device to generate the HARQ-ACK codebook for the downlink data or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook in the PUSCH and sends it.
  • step 701 For the first information and the first DCI involved in step 701, please refer to the related introduction in step 401 for details, which will not be repeated here.
  • first information for the indication that the first DCI does not include or includes DAI, but it does not mean that the same piece of “first information” can indicate that the first DCI includes DAI and It may indicate that the same first DCI does not include DAI.
  • first information for the indication that the first DCI does not include or includes DAI
  • second piece of “first information” needs to be used to indicate that the other one or more first DCIs include corresponding DAI.
  • the first information carried by one MAC CE indicates that one or more first DCIs do not include DAI
  • the first information carried by another MAC CE needs to be used to indicate that the other one or more DCIs include DAI .
  • the format of the foregoing first DCI is the same, for example, the first format.
  • the same expressions of "first DCI" and "first information" issued multiple times are reused for the purpose of simplifying the solution.
  • the network device indicates whether DAI is included in the first DCI by sending a MAC CE to the terminal device
  • "indicating that DAI is included in the first DCI” may be referred to as “activation”
  • “used to indicate The MAC CE that includes DAI in the first DCI is called “activated MAC CE”; correspondingly, “indicating that DAI is not included in the first DCI” can be called “deactivation”, and “used to indicate that the first DCI is not included in the MAC CE including DAI is called “deactivated MAC CE”.
  • the terminal device can determine the duration of activation or deactivation in a variety of ways.
  • the terminal device can determine the duration of activation after receiving the deactivated MAC CE; after the network device is deactivated through the MAC CE, the terminal device can determine after receiving the activated MAC CE The duration of deactivation expires.
  • This method can be abbreviated as "MAC CE activation + MAC CE deactivation”.
  • the duration of activation is determined by the time when the terminal device receives the next deactivated MAC CE, and the duration of deactivation is determined by the time when the terminal device receives the next activated MAC CE.
  • the network device can send the deactivation MAC CE to the terminal device after activation through the MAC CE to indicate the end of the activation duration; the network device can also send the activation MAC CE to the terminal equipment after deactivation through the MAC CE , To indicate the time limit for deactivation.
  • FIG. 8 is a schematic diagram of activation and deactivation of a network device according to an embodiment of the application.
  • the network device sends the activation MAC CE to the terminal device.
  • the terminal device obtains the activation MAC CE and the activated MAC CE takes effect at time S1.
  • Time S1 is the starting time of activation, that is, the terminal device can be considered as DAI is not included in the first DCI within the time after the time.
  • the network device After time S1, the network device sends a deactivation MAC CE to the terminal device.
  • the terminal device obtains the deactivation MAC CE and the deactivation MAC CE takes effect at time S2.
  • Time S2 is the deadline for activation and the start of deactivation. Time, that is, the terminal device may consider that the duration of activation is expired (ie, the duration of activation is the time period from time S1 to time S2) and the first DCI includes DAI in the time after time S2.
  • the network device After time S2, the network device sends the activation MAC CE to the terminal device, the terminal device obtains the activation MAC CE and the activation MAC CE takes effect at time S3, and time S3 is the end time of deactivation and the start time of activation. That is, the terminal device may consider that the duration of deactivation is up (that is, the duration of deactivation is the time period from time S2 to time S3) and the first DCI does not include DAI in the time after time S3.
  • the terminal device can consider the time period from time S3 to time S4 as the duration of activation.
  • the network device sends the activation MAC CE to the terminal device when the terminal device defaults that the first DCI includes DAI to indicate that the first DCI does not include DAI; in other examples , The network device may also send a deactivated MAC CE to the terminal device when the terminal defaults that the first DCI does not include DAI to indicate that the first DCI includes DAI.
  • the activation is automatically ended. That is to say, after the terminal device receives and activates the activation MAC CE sent by the network device, after a period of time, the terminal device considers that the duration of activation has expired. This method can be abbreviated as "MAC CE activation + continuous period of time”.
  • the duration of activation can be pre-defined, for example, pre-defined in the protocol or pre-specified when the terminal device leaves the factory; the duration of activation can also be pre-defined.
  • the configuration may be configured by the network device for the terminal device through RRC messages or system messages in advance; the period of activation may also be indicated by the network device to the terminal device by activating the MAC CE, that is, the network device
  • the activation MAC CE sent by the terminal device also carries the duration of activation to indicate the duration of this activation.
  • the network device carries the activation duration indication information in the activation MAC CE sent to the terminal device, and the activation duration indication information is used to indicate the duration of activation.
  • the activation duration indication information may directly indicate the duration of this activation, for example, the activation duration indication information indicates that the duration of this activation is 5 minutes or 10 minutes. Wait.
  • the activation duration indication information may indicate the use of multiple pre-configured optional values. Which one of the values to choose. For example, when the network device pre-configures the terminal device with 4 optional values of 5 minutes, 10 minutes, 15 minutes, and 20 minutes through the RRC message, the activation duration indication information may indicate 5 minutes, 10 minutes, Any one of the 4 optional values of 15 minutes and 20 minutes, the terminal device can determine the duration of this activation according to the activation time indication information to be 5 minutes, 10 minutes, 15 minutes, and 20 minutes among the 4 optional values which one.
  • a 2-bit field may be used in the activation duration indication information to indicate which optional value the terminal device specifically adopts, and there is a one-to-one correspondence between the value of the 2-bit field and the optional value.
  • Table 3 an example of the correspondence between the value of the field and the optional value of the activation duration indication information can be shown in Table 3:
  • the corresponding relationship between the value of the field and the optional value of the activation duration indication information may be pre-defined or pre-configured by the network device for the terminal device. In this way, when the terminal device receives the activation duration indication information, it can determine the corresponding duration according to the value of the field in the activation duration indication information, thereby determining the duration of this activation.
  • the duration of activation can be flexibly adjusted according to the actual situation , Compared with only determining the unique duration through predefined or pre-configured methods, it has higher flexibility.
  • the second period of time may be predefined, pre-configured, or the length of time indicated by the first information or the MAC CE.
  • the measurement unit of the second time period may be a measurement unit such as a radio frame, a subframe, or a time slot, or may be other units such as seconds, minutes, and hours. The specific duration of the time period is limited.
  • FIG. 9 is a schematic diagram of activation and activation end according to an embodiment of the application.
  • the terminal device defaults to include DAI in the first DCI; at time H1, the terminal device obtains the activation MAC CE sent by the network device and the activation MAC CE takes effect, and time H1 is the start of activation time.
  • the terminal device determines that the activation ends at time H2, that is, the terminal device can consider that DAI is not included in the first DCI during the time period from time H1 to time H2, where the time period from time H1 to time H2 That is the second time period.
  • the network device After time H2, the network device sends the activation MAC CE to the terminal device again, the terminal device receives the activation MAC CE and the activation MAC CE takes effect at the time H3, and the time H3 is the starting time for reactivation. Based on the duration of the second time period, the terminal device determines that the activation ends at time H4, that is, the terminal device can consider that DAI is not included in the first DCI during the time period from time H3 to time H4, where the time period from time H3 to time H4 That is the second time period.
  • the method of "MAC CE activation + duration" is used to indicate whether DAI is included in the first DCI, so that the terminal device can learn that the first DCI includes DAI and the time period that does not include DAI, which improves the solution. It is flexible and does not require network equipment to send and activate MAC CE, which saves signaling overhead.
  • the third way can be understood as a combination of the aforementioned first way and the aforementioned second way, namely activation based on activating MAC CE, and deactivation based on duration or deactivation of MAC CE.
  • the duration involved in the third method is similar to the duration described in the second method.
  • the duration in the second method please refer to the description of the duration in the second method, which will not be repeated here.
  • FIG. 10 is a schematic diagram of activation and activation end provided by an embodiment of the application.
  • the terminal device defaults to include DAI in the first DCI; at time K1, the terminal device obtains the activation MAC CE sent by the network device and the activation MAC CE takes effect.
  • K1 is the start of activation time. Based on the duration of activation, the terminal device determines that the activation ends at time K2, that is, the terminal device can consider that DAI is not included in the first DCI during the time period from time K1 to time K2, where the time period from time K1 to time K2 is The second time period.
  • the network device After time K2, the network device sends the activation MAC CE to the terminal device again, the terminal device receives the activation MAC CE and the activation MAC CE takes effect at the time K3, and the time K3 is the starting time for reactivation.
  • the network device After K3 and within the duration of activation, the network device sends a deactivated MAC CE to the terminal device, the terminal device receives the deactivated MAC CE and the deactivated MAC CE takes effect at K4, and the terminal device determines to activate at K4 Finish.
  • the K4 time is after the K3 time and is within the activation duration, that is, the terminal device receives the deactivated MAC CE within the activation duration, thereby ending the activation early.
  • the deactivated MAC CE sent by the network device may also carry information indicating the number of DAI bits to indicate the number of DAI bits included in the first DCI.
  • a 2-bit DAI bit number indicator field can be used to indicate the number of DAI bits included in the first DCI.
  • the value of the 2-bit DAI bit number indicator field is the same as the value of the DAI bit number.
  • There is a one-to-one correspondence between numbers Specifically, an example of the correspondence between the value of the DAI bit number indication field and the number of DAI bits can be shown in Table 4:
  • the number of DAI bits indicates the value of the field
  • the corresponding relationship between the value of the DAI bit number indication field and the number of DAI bits may be pre-defined or pre-configured by the network device for the terminal device. In this way, when the terminal device receives the deactivated MAC CE, it can determine the corresponding DAI bit number according to the value of the DAI bit number indication field in the deactivated MAC CE, so as to determine the first DAI received during the deactivation period. The number of bits in DAI.
  • the activated MAC CE and the deactivated MAC CE can have the same information structure.
  • An activated MAC CE/deactivated MAC CE can indicate whether the first DCI includes DAI through a DAI indicator field, and if it includes DAI The number of bits of this DAI.
  • An example can be shown in Table 5, where the DAI indication field is 2 bits:
  • DAI indicates the value of the field Whether to include the number of bits of DAI/DAI 00 Excluding DAI, the number of DAI bits is 0 bits 01 Including DAI, the number of DAI bits is 1 bit 10 Including DAI, the number of DAI bits is 2 bits 11 Including DAI, the number of DAI bits is 4 bits
  • the corresponding relationship between the value of the DAI indication field and the number of bits including DAI/DAI may be pre-defined or pre-configured by the network device for the terminal device. In this way, when the terminal device receives the activated MAC CE/deactivated MAC CE, it can determine whether DAI is included according to the value of the DAI indication field in the activated MAC CE/deactivated MAC CE, and the bit of DAI when DAI is included. number.
  • the number of DAI bits in the first DCI may also be predefined or pre-configured.
  • the terminal device can determine that the number of DAI bits in the first DCI is a predefined or pre-configured number of bits; sent by the network device
  • the terminal device determines the number of DAI bits in the first DCI according to the information carried by the deactivated MAC CE.
  • the deactivated MAC CE carries the indicating DAI bit. Number of information. In other possible examples, if "indicating that DAI is included in the first DCI” corresponds to "activating", it may be that the activated MAC CE carries information indicating the number of DAI bits.
  • the network device sends the first DCI to the terminal device.
  • the terminal device receives the first DCI.
  • the terminal device demodulates the first DCI according to the first information.
  • the network device when the network device sends the activation MAC CE to the terminal device, the network device generates and sends the first DAI that does not include DAI to the terminal device. Or, in a case where the network device sends the deactivated MAC CE to the terminal device, the network device generates and sends the first DAI including DAI to the terminal device.
  • the network device may send the first DCI to the terminal device at the first moment or after the first moment.
  • the first moment is the Nth time unit after the moment when the network device sends the aforementioned first information
  • N is greater than or equal to 1
  • N is pre-defined or pre-configured.
  • the measurement unit of the time unit may be a measurement unit such as a radio frame, a subframe, and a time slot, or may be another measurement unit, which is not specifically limited in this embodiment.
  • the effective time may be predefined, and the measurement unit of the effective time may specifically be measurement units such as radio frames, subframes, time slots, symbols, etc.; for example, after the terminal device receives L time slots that activate MAC CE , The activation takes effect, and the terminal device considers that DAI is not included in the first DCI.
  • the network device may report to the terminal device in the second time period after the aforementioned first moment.
  • the network device may be within the duration of activation (that is, the first DCI). Within the second time period) send the first DCI that does not include DAI to the terminal device.
  • activation corresponds to "indicating that DAI is included in the first DCI”
  • the network device after the network device sends the activation MAC CE to the terminal device, the network device is within the duration of activation (that is, within the second time period) Send the first DCI including DAI to the terminal device.
  • the network device sends the second information to the terminal device.
  • the second information may be carried by MAC CE.
  • the terminal device receives the second information.
  • the second information is a deactivated MAC CE; that is, when the first information indicates that DAI is not included in the first DCI, the second The information indicates that DAI is included in the first DCI.
  • the terminal device may determine that the duration of activating the MAC CE is expired, that is, the indication content of the first information is invalid, and the terminal device considers that the subsequent received first DCI includes DAI.
  • first DCI for the content indicated by the first information and the second information, but it does not mean that the first DCI indicated by the first information and the second information are the same. of.
  • first DCI indicated by the first information refers to the DCI sent by the network device to the terminal device during the effective time period of the activated MAC CE carrying the first information
  • first DCI indicated by the second information A DCI refers to the DCI sent by the network device to the terminal device during the effective time period of the deactivated MAC CE that carries the second information; among them, the network device sends the DCI to the terminal device during the effective time period of activating the MAC CE and deactivating the MAC CE.
  • the format of the DCI sent within the effective time period is the same, for example, the first format.
  • the same expression for the "first DCI" issued multiple times is used to simplify the solution.
  • the network device sends the first DCI to the terminal device.
  • the terminal device receives the first DCI.
  • the terminal device demodulates the first DCI according to the second information.
  • the network device After the network device sends the second information indicating that DAI is not included in the first DCI to the terminal device, the network device generates and sends the first DCI that does not include DAI to the terminal device.
  • the terminal device may determine the number of bits of the received first DCI based on the indication of the second information, that is, the first DCI does not include DAI, so as to realize demodulation of the first DCI.
  • the above describes in detail the process for the network device to indicate to the terminal device whether DAI is included in the first DCI by sending the first information.
  • the following will describe the process for the network device to indicate to the terminal device that the DAI is included in the first DCI in other ways. Further introduction.
  • the network device may send downlink data to the terminal device to instruct the terminal device to include DAI in the first DCI in the next period of time; and the network device to the terminal device in the next period of time
  • the first DCI sent includes DAI.
  • FIG. 11 is a schematic flowchart of a communication method 1100 according to an embodiment of this application.
  • the communication method 1100 includes:
  • the network device sends a second DCI to a terminal device, where the second DCI is used to schedule downlink transmission.
  • the terminal device receives the second DCI.
  • the second DCI may be any format or any type of DCI used for scheduling downlink transmission, that is, the second DCI may be any type of DL-DCI.
  • the network device may send the second DCI to the terminal device to schedule the PDSCH through the second DCI.
  • the format of the second DCI is the second format
  • the second format may specifically be DCI format 1_0 (DCI format 1_0), DCI format 1_1 (DCI format 1_1), or DCI format 1_2 (DCI format 1_2). Any format.
  • the DCI format 1_0, the DCI format 1_1, and the DCI format 1_2 are the formats defined for the DCI used for scheduling downlink transmission in the NR communication system.
  • the second format may also be a DCI format used for scheduling downlink transmission in other possible communication systems, or may also be another DCI format different from the foregoing format, and this embodiment does not limit the second format.
  • the network device sends the first DCI to the terminal device; the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first DCI. One format.
  • the terminal device receives and demodulates the first DCI.
  • the first format is different from the second format.
  • the first DCI involved in this embodiment is similar to the first DCI described in the embodiment corresponding to FIG. 4. For details, please refer to the description of the first DCI in the embodiment corresponding to FIG. 4, which will not be repeated here. .
  • the second moment is the mth time unit in the time domain resources occupied by the second DCI
  • m is a positive integer, 1 ⁇ m ⁇ M
  • M is the number of time units occupied by the second DCI, namely
  • the second moment may be any time unit among the time units occupied by the second DCI.
  • the measurement unit of the time unit may be a measurement unit such as a radio frame, a subframe, a time slot, or a symbol, or may be another measurement unit, which is not specifically limited in this embodiment.
  • m may specifically be 1 or M
  • the measurement unit of the time unit is a time slot
  • the second moment may specifically be the first time slot or the last time slot in the time domain resources occupied by the second DCI.
  • the second DCI generated by the network device and sent to the terminal device is used to schedule downlink transmission, and the second DCI can also be used to indicate to the terminal device that the first DCI includes DAI.
  • the second DCI indicates that the effective time point for including DAI in the first DCI may be the aforementioned second moment
  • the second DCI indicates that the effective time period for including DAI in the first DCI may be a predefined time after the second moment. Or a pre-configured time period. That is, after the terminal device receives the second DCI, the terminal device may consider that the first DCI received in the predefined or pre-configured time period after the aforementioned second moment includes DAI.
  • the effective time period indicating that the DAI is included in the first DCI may be pre-defined or pre-configured, for example, it may be pre-defined in a standard protocol or pre-defined by other means, or it may be performed by the network device through RRC. Messages and other methods are configured for terminal equipment.
  • the network device may send the first DCI including DAI to the terminal device.
  • the terminal device receives the second DCI sent by the network device, it can be considered that the first DCI received within a predefined or pre-configured time period after the second moment includes DAI. Further, after the time period ends, the DCI of the same type as the first DCI sent by the network device to the terminal device does not include DAI, until the next second DCI is received.
  • the second DCI may also carry information indicating the effective duration of the DAI included in the first DCI, that is, the terminal device may determine that the first DCI includes the DAI according to the information carried in the second DCI Effective time.
  • the information carried in the second DCI may directly indicate the effective duration of the DAI included in the first DCI. For example, if the effective duration is indicated to be 5 minutes or 10 minutes, the terminal device may consider that it is 5 minutes after receiving the second DCI.
  • the first DCI received within minutes or 10 minutes includes DAI.
  • the information carried in the second DCI may also indicate which of the multiple pre-configured optional values is used .
  • the information carried in the second DCI may indicate 5 minutes, Any one of the 4 optional values of 10 minutes, 15 minutes, and 20 minutes.
  • the terminal device can determine according to this information that the effective duration of DAI included in the first DCI is 5 minutes, 10 minutes, 15 minutes, and 20 minutes. Which of the optional values.
  • a 2-bit field may be used to indicate which optional value the terminal device specifically adopts. There is a one-to-one relationship between the value of the 2-bit field and the optional value. Corresponding relationship.
  • the first DCI sent by the network device to the terminal device in the third time period before the second time does not include DAI. That is, before the network device sends the second DCI to the terminal device, the terminal device may consider that the first DCI does not include DAI, and the network device sends the first DCI that does not include DAI to the terminal device.
  • the DCI sent by the network device in the predefined or pre-configured time period after the second moment and the DCI sent by the network device in the third time period before the second moment are used.
  • the expression "first DCI” is used, but it does not mean that the indicated DCI is the same.
  • the first DCI sent by the network device in the predefined or pre-configured time period after the second moment is DCI including DAI, and the network device sent in the third time period before the second moment
  • the first DCI of is the DCI that does not include DAI.
  • the same expression for the "first DCI" issued multiple times is used to simplify the solution.
  • each second DCI sent by the network device can be used to indicate that the first DCI includes DAI, that is, the network device pre-defined or pre-defined after the second time corresponding to each second DCI During the configured time period, the first DCI including DAI is sent to the terminal device.
  • the network device sends a second DCI to the terminal device
  • the network device continues to send a new second DCI to the terminal device within the effective time period when the second DCI indicates that the first DCI includes DAI
  • the first The calculation of the effective time of the DAI included in a DCI is restarted, that is, the terminal device uses the second moment corresponding to the new second DCI as the effective start time point, and restarts the calculation of the effective time of the DAI included in the first DCI.
  • the terminal device uses the second moment corresponding to the second DCI as the effective start time point, and restarts the calculation based on the predefined or pre-configured time period.
  • the first DCI includes the effective time of the DAI until the terminal device no longer receives a new second DCI.
  • FIG. 12 is a schematic diagram of indicating that the first DCI includes DAI through the second DCI according to an embodiment of the application.
  • the terminal device defaults that DAI is not included in the first DCI.
  • the terminal device receives the first second DCI sent by the network device, and the terminal device may consider that the first DCI received within a period of time after the time R1 includes DAI. Specifically, the terminal device determines, based on a predefined or pre-configured time period, that the first DCI received during the time period between R1 and R2 includes DAI, and the length of the time period between R1 and R2 That is, the length of the pre-defined or pre-configured time period. In other words, the time period between time R1 and time R2 is the effective time of including DAI in the first DCI. After time R2, before the terminal device receives the next second DCI, the terminal device may consider that the received first DCI does not include DAI.
  • the terminal device receives the second second DCI sent by the network device, and the terminal device may consider that the first DCI received within a period of time after the time R3 includes DAI.
  • the terminal device receives the third second DCI sent by the network device.
  • the time R4 is located after the time R3, and the time R4 is located within the effective time period of the second DCI indicating that the DAI is included in the first DCI, that is, the length of time between the time R4 and the time R3 is less than the predefined or pre-configured time.
  • the length of the time period The terminal device recalculates the effective time of DAI included in the first DCI from time R4, and determines that DAI is included in the first DCI received during the time period between R4 and R4, and between R4 and R5.
  • the length of the time period is the length of the pre-defined or pre-configured time period. From time R4 to time R5, the terminal device does not receive a new second DCI. Therefore, after time R5, the terminal device considers that the received first DCI does not include DAI.
  • the DL-DCI sent by the network device to the terminal device is used to indicate to the terminal device that the UL-DCI includes DAI. There may be no need to send a special message to the terminal device to indicate whether the UL-DCI includes DAI. Can save signaling overhead.
  • FIG. 13 is a schematic flowchart of a communication method 1300 according to an embodiment of this application.
  • the communication method 1300 includes:
  • a network device sends downlink data to a terminal device.
  • the terminal device receives the downlink data.
  • the downlink data may refer to the PDSCH, and the PDSCH may specifically be a PDSCH scheduled by DCI, or may be a PDSCH based on SPS.
  • the network device sends the first DCI to the terminal device.
  • the first DCI includes DAI.
  • the first DCI is used to schedule uplink transmission.
  • the format of the first DCI is the first DCI.
  • One format correspondingly, the terminal device receives and demodulates the first DCI.
  • the first DCI involved in this embodiment is similar to the first DCI described in the embodiment corresponding to FIG. 2.
  • the second moment is the t-th time unit in the time domain resource occupied by the downlink data
  • t is a positive integer, 1 ⁇ t ⁇ T
  • T is the number of time units occupied by the downlink data.
  • the second moment is the s-th time unit in the time domain resource occupied by the feedback opportunity corresponding to the downlink data
  • s is a positive integer, 1 ⁇ s ⁇ S
  • S is the time unit occupied by the feedback opportunity corresponding to the downlink data number.
  • the feedback timing of downlink data is the timing for the terminal device to perform HARQ-ACK feedback on whether the downlink data (such as PDSCH) is received correctly or not.
  • the terminal device can feed back the HARQ-ACK codebook through PUCCH or PUSCH.
  • the measurement unit of the time unit may be a measurement unit such as a radio frame, a subframe, a time slot, or a symbol, or may be another measurement unit, which is not specifically limited in this embodiment.
  • t may specifically be 1 or T
  • the measurement unit of the time unit is a time slot
  • the second moment may specifically be the first or last time slot in the time domain resources occupied by the downlink data.
  • s may specifically be 1 or S
  • the measurement unit of the time unit is a time slot
  • the second moment may specifically be the first or last time slot in the time domain resource occupied by the feedback opportunity corresponding to the downlink data.
  • the DCI of the same type as the first DCI sent by the network device to the terminal device does not include DAI, until the next downlink data is received .
  • the first DCI sent by the network device to the terminal device in the third time period before the second time does not include DAI. That is, before the network device sends the SPS PDSCH to the terminal device, the terminal device may consider that the first DCI does not include DAI, and the network device sends the first DCI that does not include DAI to the terminal device.
  • the DCI sent by the network device in the predefined or pre-configured time period after the second moment and the DCI sent by the network device in the third time period before the second moment are used.
  • the expression "first DCI” is used, but it does not mean that the indicated DCI is the same.
  • the first DCI sent by the network device in the predefined or pre-configured time period after the second moment is DCI including DAI, and the network device sent in the third time period before the second moment
  • the first DCI of is the DCI that does not include DAI.
  • the same expression for the "first DCI" issued multiple times is used to simplify the solution.
  • each PDSCH sent by a network device can be used to indicate that the first DCI includes DAI, that is, a predefined or pre-configured time period after the second time corresponding to each PDSCH by the network device Inside, the first DCI including DAI is sent to the terminal device.
  • the network device sends a PDSCH to the terminal device
  • the network device continues to send a new PDSCH to the terminal device within the effective time period when the PDSCH indicates that the first DCI includes DAI
  • the first DCI includes DAI
  • the calculation of the effective time restarts, that is, the terminal device uses the second moment corresponding to the new PDSCH as the effective start time point, and restarts the calculation of the effective time including the DAI in the first DCI.
  • the terminal device every time a terminal device receives a PDSCH, uses the second moment corresponding to the PDSCH as the effective starting time point, and based on a predefined or pre-configured time period, restarts the calculation of the first DCI Including the effective time of DAI until the terminal device no longer receives a new PDSCH.
  • the PDSCH sent by the network device to the terminal device is used to indicate to the terminal device that the UL-DCI includes DAI. There is no need to send a special message to the terminal device to indicate whether the UL-DCI includes DAI, which can save Signaling overhead.
  • FIG. 14 is a schematic structural diagram of a communication device 1400 according to an embodiment of the application. It should be understood that the communication device 1400 can execute each step performed by the network device in the methods in FIGS. 4 to 13, and in order to avoid repetition, details are not described herein again.
  • the communication device 1400 may be a network device or a chip system or an integrated circuit inside the network device.
  • the communication device 1400 includes: a sending unit 1401; the sending unit 1401 is configured to send first information to a terminal device, the first information indicating that the first downlink control information DCI includes the downlink allocation index DAI or does not include DAI, and the first DCI uses For scheduling uplink transmission, the format of the first DCI is the first format; the first DCI is sent to the terminal device. Further, the communication device further includes a processing unit, and the processing unit may be configured to generate the first information and/or the first DCI.
  • the DAI is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data. That is, the sending unit 1401 may also be used to send the downlink data to the terminal device.
  • the downlink data may be at least one PDSCH.
  • the DAI is used for the terminal device to generate the HARQ-ACK codebook for the downlink data or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook in the PUSCH for transmission.
  • the first information is used to indicate that the first DCI does not include DAI, or the first information is used to indicate that the terminal device is in the first state; the first DCI sent to the terminal device does not include DAI .
  • the first information is used to indicate that the first DCI includes DAI, or the first information is used to indicate that the terminal device is in the second state; the first DCI sent to the terminal device includes DAI.
  • the first information is carried by a radio resource control RRC message or MAC CE.
  • the network device also sends first time indication information to the terminal device, where the first time indication information is used to indicate the first time period; wherein, the first information is used to indicate the information located in the first time period
  • the first DCI does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first information is used to indicate that the first DCI located in the first time period includes DAI, or, in the first time period,
  • the terminal device is in the second state.
  • the first time indication information is used to indicate one or more of the cycle length, time offset, and duration of the first time period; wherein the cycle time is the period of the first time period; The duration is the length of the first time period; the time offset is the offset between the start time of the first time period and the start time of the cycle in which the first time period is located; or, the time offset is the first time period The offset between the end time and the end time of the period in which the first time period is located.
  • the sending unit 1401 is further configured to: send the first DCI to the terminal device at the first time or after the first time, the first DCI does not include DAI; wherein, the first time is the network device For the Nth time unit after the moment when the first information is sent, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the sending unit 1401 is further configured to: send the first DCI to the terminal device at the first time or after the first time, and the first DCI includes DAI; wherein, the first time is sent by the network device
  • the Nth time unit after the time of the first information, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the sending unit 1401 is further configured to: send the first DCI to the terminal device in a second time period after the first moment, the first DCI does not include DAI; wherein, the first moment is the network device
  • the Nth time unit after the moment of sending the first information, N is greater than or equal to 1, N is pre-defined or pre-configured, and the second time period is pre-defined, pre-configured for the terminal device, or passed through the first information The length of time indicated to the terminal device.
  • the DCI of the same type as the first DCI sent by the network device to the terminal device does not include DAI.
  • the sending unit 1401 is further configured to: send a first DCI to the terminal device in a second time period after the first moment, the first DCI includes DAI; wherein, the first moment is sent by the network device The Nth time unit after the moment of the first message, N is greater than or equal to 1, N is predefined or pre-configured, and the second time period is predefined, pre-configured for the terminal device, or sent through the first message The length of time indicated by the terminal device. Further, after the second time period ends, the DCI of the same type as the first DCI sent by the network device to the terminal device does not include DAI.
  • the sending unit 1401 is configured to: send a second DCI to the terminal device, and the second DCI is used to schedule downlink transmission; Send the first DCI, the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the mth time domain resource occupied by the second DCI Time unit, m is a positive integer, 1 ⁇ m ⁇ M, and M is the number of time units occupied by the second DCI.
  • the DCI of the same type as the first DCI sent by the network device to the terminal device does not include DAI.
  • the sending unit 1401 is further configured to send the first DCI to the terminal device in the third time period before the second time does not include DAI.
  • the sending unit 1401 is configured to: send downlink data to the terminal device; send the first DCI to the terminal device in a predefined or pre-configured time period after the second moment, where the first DCI includes DAI ,
  • the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format;
  • the second moment is the t-th time unit in the time domain resources occupied by the downlink data, t is a positive integer, and 1 ⁇ t ⁇ T, T is the number of time units occupied by the downlink data; or, the second moment is the sth time unit in the time domain resource occupied by the feedback timing corresponding to the downlink data, s is a positive integer, 1 ⁇ s ⁇ S , S is the number of time units occupied by the feedback opportunity corresponding to the downlink data.
  • the DCI of the same type as the first DCI sent by the network device to the terminal device does not include DAI.
  • the sending unit 1401 is further configured to send the first DCI to the terminal device in the third time period before the second time does not include DAI.
  • FIG. 15 is a schematic structural diagram of a communication device 1500 according to an embodiment of the application. It should be understood that the communication apparatus 1500 can execute each step executed by the terminal device in the methods in FIGS. 4 to 15, and in order to avoid repetition, details are not described herein again.
  • the communication device 1500 may be a terminal device or a chip system or an integrated circuit inside the terminal device.
  • the communication device 1500 includes: a receiving unit 1501; the receiving unit 1501 is configured to: receive first information from a network device; the terminal device receives a first DCI from the network device; wherein the first information indicates whether the first DCI includes DAI or not. Including DAI, the first DCI is used for scheduling uplink transmission, and the format of the first DCI is the first format. Further, the communication device further includes a processing unit configured to demodulate the first DCI. Specifically, the processing unit is configured to demodulate the first DCI according to the first information.
  • the DAI is used to indicate codebook feedback for downlink data or used to generate a codebook for downlink data. That is, the receiving unit 1501 may also be used to: receive downlink data from the network device.
  • the downlink data may be at least one PDSCH.
  • the DAI is used for the terminal device to generate the HARQ-ACK codebook for the downlink data or to indicate whether the terminal device carries the semi-static HARQ-ACK codebook in the PUSCH for transmission.
  • the first information is used to indicate that the first DCI does not include DAI, or the first information is used to indicate that the terminal device is in the first state; the first DCI from the network device does not include DAI.
  • the first information is used to indicate that the first DCI includes DAI, or the first information is used to indicate that the terminal device is in the second state; the first DCI from the network device includes DAI.
  • the first information is carried by an RRC message or a MAC CE.
  • the terminal device receives the first time indication information from the network device, where the first time indication information is used to indicate a first time period; wherein, the first information is used to indicate a location in the first time period
  • the first DCI does not include DAI, or, in the first time period, the terminal device is in the first state; or, the first information is used to indicate that the first DCI located in the first time period includes DAI, or, in the first time period,
  • the terminal device is in the second state.
  • the first time indication information is used to indicate one or more of the cycle length, time offset, and duration of the first time period; wherein the cycle time is the period of the first time period; The duration is the length of the first time period; the time offset is the offset between the start time of the first time period and the start time of the cycle in which the first time period is located; or, the time offset is the first time period The offset between the end time and the end time of the period in which the first time period is located.
  • the receiving unit 1501 is further configured to: receive the first DCI sent by the network device at the first time or after the first time, the first DCI does not include DAI; wherein, the first time is the first DCI; The Nth time unit after the sending moment of a message, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the time when the network device sends the information and the time when the terminal receives the information is delayed or inaccurate, but here the first time is uniformly regarded as the sending time of the first information, and the actual possible existence is ignored. Time delay.
  • the receiving unit 1501 is further configured to: receive the first DCI sent by the network device at or after the first time, where the first DCI includes DAI; where the first time is the first The Nth time unit after the information sending time, N is greater than or equal to 1, and N is predefined or pre-configured.
  • the receiving unit 1501 is further configured to: receive the first DCI sent by the network device in a second time period after the first time, the first DCI does not include DAI; wherein, the first time is The Nth time unit after the sending moment of the first information, N is greater than or equal to 1, N is pre-defined or pre-configured, and the second time period is pre-defined, pre-configured, or the length of time indicated by the first information .
  • the receiving unit 1501 is further configured to: receive a first DCI sent by the network device in a second time period after the first time, where the first DCI includes DAI; where the first time is the first The Nth time unit after the sending moment of an information, N is greater than or equal to 1, N is predefined or preconfigured, and the second time period is predefined, preconfigured, or the length of time indicated by the first information.
  • the DCI of the same type as the first DCI received by the receiving unit 1501 does not include DAI.
  • the receiving unit 1501 is configured to: receive a second DCI from a network device, the second DCI is used to schedule downlink transmission; within a predefined or pre-configured time period after the second moment,
  • the first DCI of the network device, the first DCI includes DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; wherein, the second moment is the first time domain resource occupied by the second DCI m time units, m is a positive integer, 1 ⁇ m ⁇ M, and M is the number of time units occupied by the second DCI.
  • the DCI of the same type as the first DCI received by the receiving unit 1501 does not include DAI.
  • the receiving unit 1501 is further configured to receive the first DCI from the network device in the third time period before the second time, which does not include DAI.
  • the receiving unit 1501 is configured to: receive downlink data from the network device; in a predefined or pre-configured time period after the second moment, receive the first DCI from the network device, and the first DCI Including DAI, the first DCI is used to schedule uplink transmission, and the format of the first DCI is the first format; where the second moment is the t-th time unit in the time domain resources occupied by the downlink data, and t is a positive integer, 1 ⁇ t ⁇ T, T is the number of time units occupied by the downlink data; or, the second moment is the sth time unit in the time domain resources occupied by the feedback timing corresponding to the downlink data, s is a positive integer, 1 ⁇ s ⁇ S, S is the number of time units occupied by the feedback opportunity corresponding to the downlink data.
  • the DCI of the same type as the first DCI received by the receiving unit 1501 does not include DAI.
  • the receiving unit 1501 is further configured to receive the first DCI from the network device in the third time period before the second time, which does not include DAI.
  • FIG. 16 is a schematic structural diagram of a communication device 1600 according to an embodiment of the application.
  • the communication device 1600 may be used to implement the method described in the foregoing method embodiment, and reference may be made to the description in the foregoing method embodiment.
  • the communication device 1600 may be a chip, a network device (such as a base station), or a terminal device.
  • the communication device 1600 includes one or more processors 1601.
  • the processor 1601 may be a general-purpose processor, a special-purpose processor, or the like.
  • it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (such as base stations, terminals, or chips), execute software programs, and process data in the software programs.
  • the communication device may include a transceiving unit to implement signal input (reception) and output (transmission).
  • the communication device may be a chip, and the transceiver unit may be an input and/or output circuit of the chip, or a communication interface. Chips can be used in terminals or base stations or other network equipment.
  • the communication device may be a terminal or a base station or other network equipment, and the transceiver unit may be a transceiver or a radio frequency chip.
  • the communication apparatus 1600 includes one or more processors 1601, and the one or more processors 1601 can implement the method of the network device or the terminal device in the embodiment shown in FIG. 2.
  • the communication device 1600 includes means for generating reference signal indication information, and means for sending reference signal indication information.
  • the functions of generating the means of reference signal indication information and sending the means of reference signal indication information may be realized by one or more processors.
  • the reference signal indication information may be generated by one or more processors, and the reference signal indication information may be sent through a transceiver, or an input/output circuit, or an interface of a chip.
  • the reference signal indication information refer to the related description in the foregoing method embodiment.
  • the communication device 1600 includes means for receiving reference signal indication information, and means for sending uplink data according to the reference signal indication information.
  • reference signal indication information and how to send uplink data according to the reference signal indication information, refer to the related description in the foregoing method embodiment.
  • the reference signal indication information may be received through a transceiver, or an input/output circuit, or an interface of a chip, and one or more processors may send uplink data according to the reference signal indication information.
  • processor 1601 may implement other functions in addition to implementing the methods in the foregoing embodiments.
  • the processor 1601 may execute instructions to cause the communication device 1600 to execute the method described in the foregoing method embodiment.
  • the instructions may be stored in the processor in whole or in part, such as the instruction 1603, or in the memory 1602 coupled to the processor, in whole or in part, such as the instruction 1604, or the communication device 1600 may be combined to execute the above method through the instructions 1603 and 1604. The method described in the examples.
  • the communication device 1600 may also include a circuit, and the circuit may implement the functions of the network device or the terminal device in the foregoing method embodiment.
  • the communication device 1600 may include one or more memories 1602, on which instructions 1604 are stored, and the instructions may be executed on the processor, so that the communication device 1600 executes the methods described in the above method embodiments .
  • data may also be stored in the memory.
  • the optional processor may also store instructions and/or data.
  • one or more memories 1602 may store the corresponding relationship described in the foregoing embodiment, or related parameters or tables involved in the foregoing embodiment.
  • the processor and memory can be set separately or integrated together.
  • the communication device 1600 may further include a transceiver 1605 and an antenna 1606.
  • the processor 1601 may be referred to as a processing unit, and controls a communication device (terminal or base station).
  • the transceiver 1605 may be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., and is used to implement the transceiver function of the communication device through the antenna 1606.
  • the present application also provides a communication system, which includes at least one of the aforementioned access network equipment, UE, and core network equipment.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments may be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • Programming logic devices discrete gates or transistor logic devices, discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM Random Access Memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM)
  • Direct Rambus RAM DR RAM
  • the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.
  • the embodiment of the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, the communication method of any of the foregoing method embodiments is implemented.
  • the embodiments of the present application also provide a computer program product, which, when executed by a computer, implements the communication method of any of the foregoing method embodiments.
  • one embodiment or “an embodiment” mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment” or “in an embodiment” in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.
  • system and “network” in this article are often used interchangeably in this article.
  • the term “and/or” in this article is only an association relationship describing the associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations.
  • the character "/" in this text generally indicates that the associated objects before and after are in an "or” relationship.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B based on A does not mean that B is determined only based on A, and B can also be determined based on A and/or other information.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated. To another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.

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Abstract

L'invention concerne un procédé de communication et un dispositif associé permettant d'augmenter la fiabilité de transmission des informations de commande de liaison descendante, et se rapportant spécifiquement à un dispositif terminal à capacité réduite (REDCAP). Le procédé comprend les étapes suivantes : un dispositif réseau transmet des premières informations à un dispositif terminal, les premières informations indiquant si des premières informations de commande de liaison descendante (DCI) comprennent un indice d'attribution de liaison descendante (DAI) ou ne comprennent pas de DAI (401), les premières DCI servant à planifier une transmission en liaison montante, et le format des premières DCI étant un premier format ; et le dispositif réseau génère et transmet les premières DCI au dispositif terminal. En indiquant au dispositif de terminal si les informations de commande de liaison descendante utilisées pour planifier une transmission en liaison montante comprennent les informations du DAI, la transmission du DAI est réalisée selon les besoins, ce qui augmente la fiabilité d'une transmission en liaison descendante tout en garantissant la fiabilité d'une rétroaction de transmission en liaison descendante.
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